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2024-06-19 11:00:08 +01:00 · 2024-06-19 10:50:01 +01:00 · 2024-06-19 10:46:58 +01:00 · 2024-06-19 10:43:33 +01:00 · 2024-06-19 10:33:53 +01:00 · 2024-06-19 10:05:39 +01:00
121 changed files with 5255 additions and 799 deletions
@@ -72,7 +72,7 @@ jobs:

      - name: Build and push all platforms
        id: build-and-push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
        with:
          push: true
          labels: |
@@ -14,7 +14,7 @@ jobs:
      # There's a 'download artifact' action, but it hasn't been updated for the workflow_run action
      # (https://github.com/actions/download-artifact/issues/60) so instead we get this mess:
      - name: 📥 Download artifact
-        uses: dawidd6/action-download-artifact@09f2f74827fd3a8607589e5ad7f9398816f540fe # v3.1.4
+        uses: dawidd6/action-download-artifact@bf251b5aa9c2f7eeb574a96ee720e24f801b7c11 # v6
        with:
          workflow: docs-pr.yaml
          run_id: ${{ github.event.workflow_run.id }}
@@ -444,9 +444,9 @@ dependencies = [

 [[package]]
 name = "regex"
-version = "1.10.4"
+version = "1.10.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c117dbdfde9c8308975b6a18d71f3f385c89461f7b3fb054288ecf2a2058ba4c"
+checksum = "b91213439dad192326a0d7c6ee3955910425f441d7038e0d6933b0aec5c4517f"
 dependencies = [
 "aho-corasick",
 "memchr",
@@ -0,0 +1 @@
+Add initial implementation of an experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint.
@@ -0,0 +1 @@
+Fix searching for users with their exact localpart whose ID includes a hyphen.
@@ -0,0 +1 @@
+ Improve ratelimiting in Synapse (#17256).
@@ -0,0 +1 @@
+Use fully-qualified `PersistedEventPosition` when returning `RoomsForUser` to facilitate proper comparisons and `RoomStreamToken` generation.
@@ -0,0 +1 @@
+Add debug logging for when room keys are uploaded, including whether they are replacing other room keys.
@@ -0,0 +1 @@
+Add support for the unstable [MSC4151](https://github.com/matrix-org/matrix-spec-proposals/pull/4151) report room API.
@@ -0,0 +1 @@
+Handle OTK uploads off master.
@@ -0,0 +1 @@
+Fix wrong retention policy being used when filtering events.
@@ -0,0 +1 @@
+Don't try and resync devices for remote users whose servers are marked as down.
@@ -0,0 +1 @@
+Fix bug where OTKs were not always included in `/sync` response when using workers.
@@ -0,0 +1 @@
+Add `is_dm` filtering to experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint.
@@ -0,0 +1 @@
+Re-organize Pydantic models and types used in handlers.
@@ -0,0 +1 @@
+Add `is_encrypted` filtering to experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint.
@@ -0,0 +1 @@
+Include user membership in events served to clients, per MSC4115.
@@ -0,0 +1 @@
+Fix a long-standing bug where an invalid 'from' parameter to [`/notifications`](https://spec.matrix.org/v1.10/client-server-api/#get_matrixclientv3notifications) would result in an Internal Server Error.
@@ -0,0 +1 @@
+Do not require user-interactive authentication for uploading cross-signing keys for the first time, per MSC3967.
@@ -0,0 +1 @@
+Do not block event sending/receiving while calulating large event auth chains.
@@ -0,0 +1 @@
+Add `stream_ordering` sort to experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint.
@@ -0,0 +1,2 @@
+`register_new_matrix_user` now supports a --password-file flag, which
+is useful for scripting.
@@ -0,0 +1 @@
+Fix edge case in `/sync` returning the wrong the state when using sharded event persisters.
@@ -0,0 +1 @@
+Add support for the unstable [MSC4151](https://github.com/matrix-org/matrix-spec-proposals/pull/4151) report room API.
@@ -0,0 +1 @@
+Bump `mypy` from 1.8.0 to 1.9.0.
@@ -0,0 +1 @@
+Expose the worker instance that persisted the event on `event.internal_metadata.instance_name`.
@@ -0,0 +1 @@
+Add initial implementation of an experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint.
@@ -0,0 +1 @@
+Add missing quotes for example for `exclude_rooms_from_sync`.
@@ -0,0 +1 @@
+Add support for via query parameter from MSC415.
@@ -0,0 +1 @@
+This is a changelog so tests will run.
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.109.0+nmu1) UNRELEASED; urgency=medium
+
+  * `register_new_matrix_user` now supports a --password-file flag.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 18 Jun 2024 13:29:36 +0100
+
 matrix-synapse-py3 (1.109.0) stable; urgency=medium

  * New synapse release 1.109.0.
@@ -31,8 +31,12 @@ A sample YAML file accepted by `register_new_matrix_user` is described below:
    Local part of the new user. Will prompt if omitted.

  * `-p`, `--password`:
-    New password for user. Will prompt if omitted. Supplying the password
-    on the command line is not recommended. Use the STDIN instead.
+    New password for user. Will prompt if this option and `--password-file` are omitted.
+    Supplying the password on the command line is not recommended.
+
+  * `--password-file`:
+    File containing the new password for user. If set, overrides `--password`.
+    This is a more secure alternative to specifying the password on the command line.

  * `-a`, `--admin`:
    Register new user as an admin. Will prompt if omitted.
@@ -105,8 +105,6 @@ experimental_features:
  # Expose a room summary for public rooms
  msc3266_enabled: true

-  msc4115_membership_on_events: true
-
 server_notices:
  system_mxid_localpart: _server
  system_mxid_display_name: "Server Alert"
@@ -1946,6 +1946,24 @@ Example configuration:
 max_image_pixels: 35M
 ```
 ---
+### `remote_media_download_burst_count`
+
+Remote media downloads are ratelimited using a [leaky bucket algorithm](https://en.wikipedia.org/wiki/Leaky_bucket), where a given "bucket" is keyed to the IP address of the requester when requesting remote media downloads. This configuration option sets the size of the bucket against which the size in bytes of downloads are penalized - if the bucket is full, ie a given number of bytes have already been downloaded, further downloads will be denied until the bucket drains.  Defaults to 500MiB. See also `remote_media_download_per_second` which determines the rate at which the "bucket" is emptied and thus has available space to authorize new requests.  
+
+Example configuration:
+```yaml
+remote_media_download_burst_count: 200M
+```
+---
+### `remote_media_download_per_second`
+
+Works in conjunction with `remote_media_download_burst_count` to ratelimit remote media downloads - this configuration option determines the rate at which the "bucket" (see above) leaks in bytes per second. As requests are made to download remote media, the size of those requests in bytes is added to the bucket, and once the bucket has reached it's capacity, no more requests will be allowed until a number of bytes has "drained" from the bucket. This setting determines the rate at which bytes drain from the bucket, with the practical effect that the larger the number, the faster the bucket leaks, allowing for more bytes downloaded over a shorter period of time. Defaults to 87KiB per second. See also `remote_media_download_burst_count`.
+
+Example configuration:
+```yaml
+remote_media_download_per_second: 40K
+```
+---
 ### `prevent_media_downloads_from`

 A list of domains to never download media from. Media from these
@@ -4132,7 +4150,7 @@ By default, no room is excluded.
 Example configuration:
 ```yaml
 exclude_rooms_from_sync:
-    - !foo:example.com
+    - "!foo:example.com"
 ```

 ---
@@ -912,13 +912,13 @@ trio = ["async_generator", "trio"]

 [[package]]
 name = "jinja2"
-version = "3.1.3"
+version = "3.1.4"
 description = "A very fast and expressive template engine."
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "Jinja2-3.1.3-py3-none-any.whl", hash = "sha256:7d6d50dd97d52cbc355597bd845fabfbac3f551e1f99619e39a35ce8c370b5fa"},
-    {file = "Jinja2-3.1.3.tar.gz", hash = "sha256:ac8bd6544d4bb2c9792bf3a159e80bba8fda7f07e81bc3aed565432d5925ba90"},
+    {file = "jinja2-3.1.4-py3-none-any.whl", hash = "sha256:bc5dd2abb727a5319567b7a813e6a2e7318c39f4f487cfe6c89c6f9c7d25197d"},
+    {file = "jinja2-3.1.4.tar.gz", hash = "sha256:4a3aee7acbbe7303aede8e9648d13b8bf88a429282aa6122a993f0ac800cb369"},
 ]

 [package.dependencies]
@@ -1319,103 +1319,103 @@ files = [

 [[package]]
 name = "msgpack"
-version = "1.0.7"
+version = "1.0.8"
 description = "MessagePack serializer"
 optional = false
 python-versions = ">=3.8"
 files = [
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+    {file = "mypy-1.9.0-cp312-cp312-musllinux_1_1_x86_64.whl", hash = "sha256:190da1ee69b427d7efa8aa0d5e5ccd67a4fb04038c380237a0d96829cb157913"},
+    {file = "mypy-1.9.0-cp312-cp312-win_amd64.whl", hash = "sha256:fe28657de3bfec596bbeef01cb219833ad9d38dd5393fc649f4b366840baefe6"},
+    {file = "mypy-1.9.0-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:e54396d70be04b34f31d2edf3362c1edd023246c82f1730bbf8768c28db5361b"},
+    {file = "mypy-1.9.0-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:5e6061f44f2313b94f920e91b204ec600982961e07a17e0f6cd83371cb23f5c2"},
+    {file = "mypy-1.9.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:81a10926e5473c5fc3da8abb04119a1f5811a236dc3a38d92015cb1e6ba4cb9e"},
+    {file = "mypy-1.9.0-cp38-cp38-musllinux_1_1_x86_64.whl", hash = "sha256:b685154e22e4e9199fc95f298661deea28aaede5ae16ccc8cbb1045e716b3e04"},
+    {file = "mypy-1.9.0-cp38-cp38-win_amd64.whl", hash = "sha256:5d741d3fc7c4da608764073089e5f58ef6352bedc223ff58f2f038c2c4698a89"},
+    {file = "mypy-1.9.0-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:587ce887f75dd9700252a3abbc9c97bbe165a4a630597845c61279cf32dfbf02"},
+    {file = "mypy-1.9.0-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:f88566144752999351725ac623471661c9d1cd8caa0134ff98cceeea181789f4"},
+    {file = "mypy-1.9.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:61758fabd58ce4b0720ae1e2fea5cfd4431591d6d590b197775329264f86311d"},
+    {file = "mypy-1.9.0-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:e49499be624dead83927e70c756970a0bc8240e9f769389cdf5714b0784ca6bf"},
+    {file = "mypy-1.9.0-cp39-cp39-win_amd64.whl", hash = "sha256:571741dc4194b4f82d344b15e8837e8c5fcc462d66d076748142327626a1b6e9"},
+    {file = "mypy-1.9.0-py3-none-any.whl", hash = "sha256:a260627a570559181a9ea5de61ac6297aa5af202f06fd7ab093ce74e7181e43e"},
+    {file = "mypy-1.9.0.tar.gz", hash = "sha256:3cc5da0127e6a478cddd906068496a97a7618a21ce9b54bde5bf7e539c7af974"},
 ]

 [package.dependencies]
@@ -1524,13 +1524,13 @@ files = [

 [[package]]
 name = "phonenumbers"
-version = "8.13.37"
+version = "8.13.39"
 description = "Python version of Google's common library for parsing, formatting, storing and validating international phone numbers."
 optional = false
 python-versions = "*"
 files = [
-    {file = "phonenumbers-8.13.37-py2.py3-none-any.whl", hash = "sha256:4ea00ef5012422c08c7955c21131e7ae5baa9a3ef52cf2d561e963f023006b80"},
-    {file = "phonenumbers-8.13.37.tar.gz", hash = "sha256:bd315fed159aea0516f7c367231810fe8344d5bec26156b88fa18374c11d1cf2"},
+    {file = "phonenumbers-8.13.39-py2.py3-none-any.whl", hash = "sha256:3ad2d086fa71e7eef409001b9195ac54bebb0c6e3e752209b558ca192c9229a0"},
+    {file = "phonenumbers-8.13.39.tar.gz", hash = "sha256:db7ca4970d206b2056231105300753b1a5b229f43416f8c2b3010e63fbb68d77"},
 ]

 [[package]]
@@ -2387,13 +2387,13 @@ doc = ["Sphinx", "sphinx-rtd-theme"]

 [[package]]
 name = "sentry-sdk"
-version = "2.1.1"
+version = "2.3.1"
 description = "Python client for Sentry (https://sentry.io)"
 optional = true
 python-versions = ">=3.6"
 files = [
-    {file = "sentry_sdk-2.1.1-py2.py3-none-any.whl", hash = "sha256:99aeb78fb76771513bd3b2829d12613130152620768d00cd3e45ac00cb17950f"},
-    {file = "sentry_sdk-2.1.1.tar.gz", hash = "sha256:95d8c0bb41c8b0bc37ab202c2c4a295bb84398ee05f4cdce55051cd75b926ec1"},
+    {file = "sentry_sdk-2.3.1-py2.py3-none-any.whl", hash = "sha256:c5aeb095ba226391d337dd42a6f9470d86c9fc236ecc71cfc7cd1942b45010c6"},
+    {file = "sentry_sdk-2.3.1.tar.gz", hash = "sha256:139a71a19f5e9eb5d3623942491ce03cf8ebc14ea2e39ba3e6fe79560d8a5b1f"},
 ]

 [package.dependencies]
@@ -2415,7 +2415,7 @@ django = ["django (>=1.8)"]
 falcon = ["falcon (>=1.4)"]
 fastapi = ["fastapi (>=0.79.0)"]
 flask = ["blinker (>=1.1)", "flask (>=0.11)", "markupsafe"]
-grpcio = ["grpcio (>=1.21.1)"]
+grpcio = ["grpcio (>=1.21.1)", "protobuf (>=3.8.0)"]
 httpx = ["httpx (>=0.16.0)"]
 huey = ["huey (>=2)"]
 huggingface-hub = ["huggingface-hub (>=0.22)"]
@@ -2808,13 +2808,13 @@ files = [

 [[package]]
 name = "types-jsonschema"
-version = "4.21.0.20240311"
+version = "4.22.0.20240610"
 description = "Typing stubs for jsonschema"
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "types-jsonschema-4.21.0.20240311.tar.gz", hash = "sha256:f7165ce70abd91df490c73b089873afd2899c5e56430ee495b64f851ad01f287"},
-    {file = "types_jsonschema-4.21.0.20240311-py3-none-any.whl", hash = "sha256:e872f5661513824edf9698f73a66c9c114713d93eab58699bd0532e7e6db5750"},
+    {file = "types-jsonschema-4.22.0.20240610.tar.gz", hash = "sha256:f82ab9fe756e3a2642ea9712c46b403ce61eb380b939b696cff3252af42f65b0"},
+    {file = "types_jsonschema-4.22.0.20240610-py3-none-any.whl", hash = "sha256:89996b9bd1928f820a0e252b2844be21cd2e55d062b6fa1048d88453006ad89e"},
 ]

 [package.dependencies]
@@ -2822,13 +2822,13 @@ referencing = "*"

 [[package]]
 name = "types-netaddr"
-version = "1.2.0.20240219"
+version = "1.3.0.20240530"
 description = "Typing stubs for netaddr"
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "types-netaddr-1.2.0.20240219.tar.gz", hash = "sha256:984e70ad838218d3032f37f05a7e294f7b007fe274ec9d774265c8c06698395f"},
-    {file = "types_netaddr-1.2.0.20240219-py3-none-any.whl", hash = "sha256:b26144e878acb8a1a9008e6997863714db04f8029a0f7f6bfe483c977d21b522"},
+    {file = "types-netaddr-1.3.0.20240530.tar.gz", hash = "sha256:742c2ec1f202b666f544223e2616b34f1f13df80c91e5aeaaa93a72e4d0774ea"},
+    {file = "types_netaddr-1.3.0.20240530-py3-none-any.whl", hash = "sha256:354998d018e326da4f1d9b005fc91137b7c2c473aaf03c4ef64bf83c6861b440"},
 ]

 [[package]]
@@ -2844,13 +2844,13 @@ files = [

 [[package]]
 name = "types-pillow"
-version = "10.2.0.20240423"
+version = "10.2.0.20240520"
 description = "Typing stubs for Pillow"
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "types-Pillow-10.2.0.20240423.tar.gz", hash = "sha256:696e68b9b6a58548fc307a8669830469237c5b11809ddf978ac77fafa79251cd"},
-    {file = "types_Pillow-10.2.0.20240423-py3-none-any.whl", hash = "sha256:bd12923093b96c91d523efcdb66967a307f1a843bcfaf2d5a529146c10a9ced3"},
+    {file = "types-Pillow-10.2.0.20240520.tar.gz", hash = "sha256:130b979195465fa1e1676d8e81c9c7c30319e8e95b12fae945e8f0d525213107"},
+    {file = "types_Pillow-10.2.0.20240520-py3-none-any.whl", hash = "sha256:33c36494b380e2a269bb742181bea5d9b00820367822dbd3760f07210a1da23d"},
 ]

 [[package]]
@@ -2881,13 +2881,13 @@ types-cffi = "*"

 [[package]]
 name = "types-pyyaml"
-version = "6.0.12.12"
+version = "6.0.12.20240311"
 description = "Typing stubs for PyYAML"
 optional = false
-python-versions = "*"
+python-versions = ">=3.8"
 files = [
-    {file = "types-PyYAML-6.0.12.12.tar.gz", hash = "sha256:334373d392fde0fdf95af5c3f1661885fa10c52167b14593eb856289e1855062"},
-    {file = "types_PyYAML-6.0.12.12-py3-none-any.whl", hash = "sha256:c05bc6c158facb0676674b7f11fe3960db4f389718e19e62bd2b84d6205cfd24"},
+    {file = "types-PyYAML-6.0.12.20240311.tar.gz", hash = "sha256:a9e0f0f88dc835739b0c1ca51ee90d04ca2a897a71af79de9aec5f38cb0a5342"},
+    {file = "types_PyYAML-6.0.12.20240311-py3-none-any.whl", hash = "sha256:b845b06a1c7e54b8e5b4c683043de0d9caf205e7434b3edc678ff2411979b8f6"},
 ]

 [[package]]
@@ -204,6 +204,8 @@ pub struct EventInternalMetadata {
    /// The stream ordering of this event. None, until it has been persisted.
    #[pyo3(get, set)]
    stream_ordering: Option<NonZeroI64>,
+    #[pyo3(get, set)]
+    instance_name: Option<String>,

    /// whether this event is an outlier (ie, whether we have the state at that
    /// point in the DAG)
@@ -232,6 +234,7 @@ impl EventInternalMetadata {
        Ok(EventInternalMetadata {
            data,
            stream_ordering: None,
+            instance_name: None,
            outlier: false,
        })
    }
@@ -223,7 +223,6 @@ test_packages=(
    ./tests/msc3930
    ./tests/msc3902
    ./tests/msc3967
-    ./tests/msc4115
 )

 # Enable dirty runs, so tests will reuse the same container where possible.
@@ -173,11 +173,18 @@ def main() -> None:
        default=None,
        help="Local part of the new user. Will prompt if omitted.",
    )
-    parser.add_argument(
+    password_group = parser.add_mutually_exclusive_group()
+    password_group.add_argument(
        "-p",
        "--password",
        default=None,
-        help="New password for user. Will prompt if omitted.",
+        help="New password for user. Will prompt for a password if "
+        "this flag and `--password-file` are both omitted.",
+    )
+    password_group.add_argument(
+        "--password-file",
+        default=None,
+        help="File containing the new password for user. If set, will override `--password`.",
    )
    parser.add_argument(
        "-t",
@@ -247,6 +254,11 @@ def main() -> None:
            print(_NO_SHARED_SECRET_OPTS_ERROR, file=sys.stderr)
            sys.exit(1)

+    if args.password_file:
+        password = _read_file(args.password_file, "password-file").strip()
+    else:
+        password = args.password
+
    if args.server_url:
        server_url = args.server_url
    elif config is not None:
@@ -269,9 +281,7 @@ def main() -> None:
    if args.admin or args.no_admin:
        admin = args.admin

-    register_new_user(
-        args.user, args.password, server_url, secret, admin, args.user_type
-    )
+    register_new_user(args.user, password, server_url, secret, admin, args.user_type)


 def _read_file(file_path: Any, config_path: str) -> str:
@@ -50,7 +50,7 @@ class Membership:
    KNOCK: Final = "knock"
    LEAVE: Final = "leave"
    BAN: Final = "ban"
-    LIST: Final = (INVITE, JOIN, KNOCK, LEAVE, BAN)
+    LIST: Final = {INVITE, JOIN, KNOCK, LEAVE, BAN}


 class PresenceState:
@@ -238,7 +238,7 @@ class EventUnsignedContentFields:
    """Fields found inside the 'unsigned' data on events"""

    # Requesting user's membership, per MSC4115
-    MSC4115_MEMBERSHIP: Final = "io.element.msc4115.membership"
+    MEMBERSHIP: Final = "membership"


 class RoomTypes:
@@ -25,6 +25,7 @@ import os
 import signal
 import socket
 import sys
+import time
 import traceback
 import warnings
 from textwrap import indent
@@ -531,7 +532,13 @@ async def start(hs: "HomeServer") -> None:
    # numbers of DNS requests don't starve out other users of the threadpool.
    resolver_threadpool = ThreadPool(name="gai_resolver")
    resolver_threadpool.start()
-    reactor.addSystemEventTrigger("during", "shutdown", resolver_threadpool.stop)
+
+    def stop_threadpool() -> None:
+        logger.warning("Stopping thread pool...")
+        resolver_threadpool.stop()
+        logger.warning("Stopped thread pool")
+
+    reactor.addSystemEventTrigger("during", "shutdown", stop_threadpool)
    reactor.installNameResolver(
        GAIResolver(reactor, getThreadPool=lambda: resolver_threadpool)
    )
@@ -624,9 +631,18 @@ async def start(hs: "HomeServer") -> None:
        gc.collect()
        gc.freeze()

+        def exit() -> None:
+            logger.warning("Doing FREEZE")
+
+            start = time.time()
+            gc.freeze()
+            end = time.time()
+
+            logger.warning("GC freeze took %d ms", (end - start) * 1000)
+
        # Speed up shutdowns by freezing all allocated objects. This moves everything
        # into the permanent generation and excludes them from the final GC.
-        atexit.register(gc.freeze)
+        atexit.register(exit)


 def reload_cache_config(config: HomeServerConfig) -> None:
@@ -393,9 +393,6 @@ class ExperimentalConfig(Config):
        # MSC3391: Removing account data.
        self.msc3391_enabled = experimental.get("msc3391_enabled", False)

-        # MSC3967: Do not require UIA when first uploading cross signing keys
-        self.msc3967_enabled = experimental.get("msc3967_enabled", False)
-
        # MSC3861: Matrix architecture change to delegate authentication via OIDC
        try:
            self.msc3861 = MSC3861(**experimental.get("msc3861", {}))
@@ -436,10 +433,12 @@ class ExperimentalConfig(Config):
                ("experimental", "msc4108_delegation_endpoint"),
            )

-        self.msc4115_membership_on_events = experimental.get(
-            "msc4115_membership_on_events", False
-        )
-
        self.msc3916_authenticated_media_enabled = experimental.get(
            "msc3916_authenticated_media_enabled", False
        )
+
+        # MSC4151: Report room API (Client-Server API)
+        self.msc4151_enabled: bool = experimental.get("msc4151_enabled", False)
+
+        # MSC4156: Migrate server_name to via
+        self.msc4156_enabled: bool = experimental.get("msc4156_enabled", False)
@@ -218,3 +218,13 @@ class RatelimitConfig(Config):
            "rc_media_create",
            defaults={"per_second": 10, "burst_count": 50},
        )
+
+        self.remote_media_downloads = RatelimitSettings(
+            key="rc_remote_media_downloads",
+            per_second=self.parse_size(
+                config.get("remote_media_download_per_second", "87K")
+            ),
+            burst_count=self.parse_size(
+                config.get("remote_media_download_burst_count", "500M")
+            ),
+        )
@@ -90,6 +90,7 @@ def prune_event(event: EventBase) -> EventBase:
    pruned_event.internal_metadata.stream_ordering = (
        event.internal_metadata.stream_ordering
    )
+    pruned_event.internal_metadata.instance_name = event.internal_metadata.instance_name
    pruned_event.internal_metadata.outlier = event.internal_metadata.outlier

    # Mark the event as redacted
@@ -116,6 +117,7 @@ def clone_event(event: EventBase) -> EventBase:
    new_event.internal_metadata.stream_ordering = (
        event.internal_metadata.stream_ordering
    )
+    new_event.internal_metadata.instance_name = event.internal_metadata.instance_name
    new_event.internal_metadata.outlier = event.internal_metadata.outlier

    return new_event
@@ -47,9 +47,9 @@ from synapse.events.utils import (
    validate_canonicaljson,
 )
 from synapse.http.servlet import validate_json_object
-from synapse.rest.models import RequestBodyModel
 from synapse.storage.controllers.state import server_acl_evaluator_from_event
 from synapse.types import EventID, JsonDict, RoomID, StrCollection, UserID
+from synapse.types.rest import RequestBodyModel


 class EventValidator:
@@ -56,6 +56,7 @@ from synapse.api.errors import (
    SynapseError,
    UnsupportedRoomVersionError,
 )
+from synapse.api.ratelimiting import Ratelimiter
 from synapse.api.room_versions import (
    KNOWN_ROOM_VERSIONS,
    EventFormatVersions,
@@ -1877,6 +1878,8 @@ class FederationClient(FederationBase):
        output_stream: BinaryIO,
        max_size: int,
        max_timeout_ms: int,
+        download_ratelimiter: Ratelimiter,
+        ip_address: str,
    ) -> Tuple[int, Dict[bytes, List[bytes]]]:
        try:
            return await self.transport_layer.download_media_v3(
@@ -1885,6 +1888,8 @@ class FederationClient(FederationBase):
                output_stream=output_stream,
                max_size=max_size,
                max_timeout_ms=max_timeout_ms,
+                download_ratelimiter=download_ratelimiter,
+                ip_address=ip_address,
            )
        except HttpResponseException as e:
            # If an error is received that is due to an unrecognised endpoint,
@@ -1905,6 +1910,8 @@ class FederationClient(FederationBase):
            output_stream=output_stream,
            max_size=max_size,
            max_timeout_ms=max_timeout_ms,
+            download_ratelimiter=download_ratelimiter,
+            ip_address=ip_address,
        )


@@ -674,7 +674,7 @@ class FederationServer(FederationBase):
        # This is in addition to the HS-level rate limiting applied by
        # BaseFederationServlet.
        # type-ignore: mypy doesn't seem able to deduce the type of the limiter(!?)
-        await self._room_member_handler._join_rate_per_room_limiter.ratelimit(  # type: ignore[has-type]
+        await self._room_member_handler._join_rate_per_room_limiter.ratelimit(
            requester=None,
            key=room_id,
            update=False,
@@ -717,7 +717,7 @@ class FederationServer(FederationBase):
            SynapseTags.SEND_JOIN_RESPONSE_IS_PARTIAL_STATE,
            caller_supports_partial_state,
        )
-        await self._room_member_handler._join_rate_per_room_limiter.ratelimit(  # type: ignore[has-type]
+        await self._room_member_handler._join_rate_per_room_limiter.ratelimit(
            requester=None,
            key=room_id,
            update=False,
@@ -43,6 +43,7 @@ import ijson

 from synapse.api.constants import Direction, Membership
 from synapse.api.errors import Codes, HttpResponseException, SynapseError
+from synapse.api.ratelimiting import Ratelimiter
 from synapse.api.room_versions import RoomVersion
 from synapse.api.urls import (
    FEDERATION_UNSTABLE_PREFIX,
@@ -819,6 +820,8 @@ class TransportLayerClient:
        output_stream: BinaryIO,
        max_size: int,
        max_timeout_ms: int,
+        download_ratelimiter: Ratelimiter,
+        ip_address: str,
    ) -> Tuple[int, Dict[bytes, List[bytes]]]:
        path = f"/_matrix/media/r0/download/{destination}/{media_id}"

@@ -834,6 +837,8 @@ class TransportLayerClient:
                "allow_remote": "false",
                "timeout_ms": str(max_timeout_ms),
            },
+            download_ratelimiter=download_ratelimiter,
+            ip_address=ip_address,
        )

    async def download_media_v3(
@@ -843,6 +848,8 @@ class TransportLayerClient:
        output_stream: BinaryIO,
        max_size: int,
        max_timeout_ms: int,
+        download_ratelimiter: Ratelimiter,
+        ip_address: str,
    ) -> Tuple[int, Dict[bytes, List[bytes]]]:
        path = f"/_matrix/media/v3/download/{destination}/{media_id}"

@@ -862,6 +869,8 @@ class TransportLayerClient:
                "allow_redirect": "true",
            },
            follow_redirects=True,
+            download_ratelimiter=download_ratelimiter,
+            ip_address=ip_address,
        )


@@ -42,7 +42,6 @@ class AdminHandler:
        self._device_handler = hs.get_device_handler()
        self._storage_controllers = hs.get_storage_controllers()
        self._state_storage_controller = self._storage_controllers.state
-        self._hs_config = hs.config
        self._msc3866_enabled = hs.config.experimental.msc3866.enabled

    async def get_whois(self, user: UserID) -> JsonMapping:
@@ -126,13 +125,7 @@ class AdminHandler:
        # Get all rooms the user is in or has been in
        rooms = await self._store.get_rooms_for_local_user_where_membership_is(
            user_id,
-            membership_list=(
-                Membership.JOIN,
-                Membership.LEAVE,
-                Membership.BAN,
-                Membership.INVITE,
-                Membership.KNOCK,
-            ),
+            membership_list=Membership.LIST,
        )

        # We only try and fetch events for rooms the user has been in. If
@@ -179,7 +172,7 @@ class AdminHandler:
            if room.membership == Membership.JOIN:
                stream_ordering = self._store.get_room_max_stream_ordering()
            else:
-                stream_ordering = room.stream_ordering
+                stream_ordering = room.event_pos.stream

            from_key = RoomStreamToken(topological=0, stream=0)
            to_key = RoomStreamToken(stream=stream_ordering)
@@ -221,7 +214,6 @@ class AdminHandler:
                    self._storage_controllers,
                    user_id,
                    events,
-                    msc4115_membership_on_events=self._hs_config.experimental.msc4115_membership_on_events,
                )

                writer.write_events(room_id, events)
@@ -35,6 +35,7 @@ from synapse.api.errors import CodeMessageException, Codes, NotFoundError, Synap
 from synapse.handlers.device import DeviceHandler
 from synapse.logging.context import make_deferred_yieldable, run_in_background
 from synapse.logging.opentracing import log_kv, set_tag, tag_args, trace
+from synapse.replication.http.devices import ReplicationUploadKeysForUserRestServlet
 from synapse.types import (
    JsonDict,
    JsonMapping,
@@ -45,7 +46,10 @@ from synapse.types import (
 from synapse.util import json_decoder
 from synapse.util.async_helpers import Linearizer, concurrently_execute
 from synapse.util.cancellation import cancellable
-from synapse.util.retryutils import NotRetryingDestination
+from synapse.util.retryutils import (
+    NotRetryingDestination,
+    filter_destinations_by_retry_limiter,
+)

 if TYPE_CHECKING:
    from synapse.server import HomeServer
@@ -86,6 +90,12 @@ class E2eKeysHandler:
                edu_updater.incoming_signing_key_update,
            )

+            self.device_key_uploader = self.upload_device_keys_for_user
+        else:
+            self.device_key_uploader = (
+                ReplicationUploadKeysForUserRestServlet.make_client(hs)
+            )
+
        # doesn't really work as part of the generic query API, because the
        # query request requires an object POST, but we abuse the
        # "query handler" interface.
@@ -268,10 +278,8 @@ class E2eKeysHandler:
                "%d destinations to query devices for", len(remote_queries_not_in_cache)
            )

-            async def _query(
-                destination_queries: Tuple[str, Dict[str, Iterable[str]]]
-            ) -> None:
-                destination, queries = destination_queries
+            async def _query(destination: str) -> None:
+                queries = remote_queries_not_in_cache[destination]
                return await self._query_devices_for_destination(
                    results,
                    cross_signing_keys,
@@ -281,9 +289,20 @@ class E2eKeysHandler:
                    timeout,
                )

+            # Only try and fetch keys for destinations that are not marked as
+            # down.
+            filtered_destinations = await filter_destinations_by_retry_limiter(
+                remote_queries_not_in_cache.keys(),
+                self.clock,
+                self.store,
+                # Let's give an arbitrary grace period for those hosts that are
+                # only recently down
+                retry_due_within_ms=60 * 1000,
+            )
+
            await concurrently_execute(
                _query,
-                remote_queries_not_in_cache.items(),
+                filtered_destinations,
                10,
                delay_cancellation=True,
            )
@@ -784,36 +803,17 @@ class E2eKeysHandler:
            "one_time_keys": A mapping from algorithm to number of keys for that
                algorithm, including those previously persisted.
        """
-        # This can only be called from the main process.
-        assert isinstance(self.device_handler, DeviceHandler)
-
        time_now = self.clock.time_msec()

        # TODO: Validate the JSON to make sure it has the right keys.
        device_keys = keys.get("device_keys", None)
        if device_keys:
-            logger.info(
-                "Updating device_keys for device %r for user %s at %d",
-                device_id,
-                user_id,
-                time_now,
+            await self.device_key_uploader(
+                user_id=user_id,
+                device_id=device_id,
+                keys={"device_keys": device_keys},
            )
-            log_kv(
-                {
-                    "message": "Updating device_keys for user.",
-                    "user_id": user_id,
-                    "device_id": device_id,
-                }
-            )
-            # TODO: Sign the JSON with the server key
-            changed = await self.store.set_e2e_device_keys(
-                user_id, device_id, time_now, device_keys
-            )
-            if changed:
-                # Only notify about device updates *if* the keys actually changed
-                await self.device_handler.notify_device_update(user_id, [device_id])
-        else:
-            log_kv({"message": "Not updating device_keys for user", "user_id": user_id})
+
        one_time_keys = keys.get("one_time_keys", None)
        if one_time_keys:
            log_kv(
@@ -849,6 +849,49 @@ class E2eKeysHandler:
                {"message": "Did not update fallback_keys", "reason": "no keys given"}
            )

+        result = await self.store.count_e2e_one_time_keys(user_id, device_id)
+
+        set_tag("one_time_key_counts", str(result))
+        return {"one_time_key_counts": result}
+
+    @tag_args
+    async def upload_device_keys_for_user(
+        self, user_id: str, device_id: str, keys: JsonDict
+    ) -> None:
+        """
+        Args:
+            user_id: user whose keys are being uploaded.
+            device_id: device whose keys are being uploaded.
+            device_keys: the `device_keys` of an /keys/upload request.
+
+        """
+        # This can only be called from the main process.
+        assert isinstance(self.device_handler, DeviceHandler)
+
+        time_now = self.clock.time_msec()
+
+        device_keys = keys["device_keys"]
+        logger.info(
+            "Updating device_keys for device %r for user %s at %d",
+            device_id,
+            user_id,
+            time_now,
+        )
+        log_kv(
+            {
+                "message": "Updating device_keys for user.",
+                "user_id": user_id,
+                "device_id": device_id,
+            }
+        )
+        # TODO: Sign the JSON with the server key
+        changed = await self.store.set_e2e_device_keys(
+            user_id, device_id, time_now, device_keys
+        )
+        if changed:
+            # Only notify about device updates *if* the keys actually changed
+            await self.device_handler.notify_device_update(user_id, [device_id])
+
        # the device should have been registered already, but it may have been
        # deleted due to a race with a DELETE request. Or we may be using an
        # old access_token without an associated device_id. Either way, we
@@ -856,11 +899,6 @@ class E2eKeysHandler:
        # keys without a corresponding device.
        await self.device_handler.check_device_registered(user_id, device_id)

-        result = await self.store.count_e2e_one_time_keys(user_id, device_id)
-
-        set_tag("one_time_key_counts", str(result))
-        return {"one_time_key_counts": result}
-
    async def _upload_one_time_keys_for_user(
        self, user_id: str, device_id: str, time_now: int, one_time_keys: JsonDict
    ) -> None:
@@ -247,6 +247,12 @@ class E2eRoomKeysHandler:
                    if current_room_key:
                        if self._should_replace_room_key(current_room_key, room_key):
                            log_kv({"message": "Replacing room key."})
+                            logger.debug(
+                                "Replacing room key. room=%s session=%s user=%s",
+                                room_id,
+                                session_id,
+                                user_id,
+                            )
                            # updates are done one at a time in the DB, so send
                            # updates right away rather than batching them up,
                            # like we do with the inserts
@@ -256,6 +262,12 @@ class E2eRoomKeysHandler:
                            changed = True
                        else:
                            log_kv({"message": "Not replacing room_key."})
+                            logger.debug(
+                                "Not replacing room key. room=%s session=%s user=%s",
+                                room_id,
+                                session_id,
+                                user_id,
+                            )
                    else:
                        log_kv(
                            {
@@ -265,6 +277,12 @@ class E2eRoomKeysHandler:
                            }
                        )
                        log_kv({"message": "Replacing room key."})
+                        logger.debug(
+                            "Inserting new room key. room=%s session=%s user=%s",
+                            room_id,
+                            session_id,
+                            user_id,
+                        )
                        to_insert.append((room_id, session_id, room_key))
                        changed = True

@@ -148,7 +148,6 @@ class EventHandler:
    def __init__(self, hs: "HomeServer"):
        self.store = hs.get_datastores().main
        self._storage_controllers = hs.get_storage_controllers()
-        self._config = hs.config

    async def get_event(
        self,
@@ -194,7 +193,6 @@ class EventHandler:
            user.to_string(),
            [event],
            is_peeking=is_peeking,
-            msc4115_membership_on_events=self._config.experimental.msc4115_membership_on_events,
        )

        if not filtered:
@@ -199,7 +199,7 @@ class InitialSyncHandler:
                    )
                elif event.membership == Membership.LEAVE:
                    room_end_token = RoomStreamToken(
-                        stream=event.stream_ordering,
+                        stream=event.event_pos.stream,
                    )
                    deferred_room_state = run_in_background(
                        self._state_storage_controller.get_state_for_events,
@@ -224,7 +224,6 @@ class InitialSyncHandler:
                    self._storage_controllers,
                    user_id,
                    messages,
-                    msc4115_membership_on_events=self.hs.config.experimental.msc4115_membership_on_events,
                )

                start_token = now_token.copy_and_replace(StreamKeyType.ROOM, token)
@@ -383,7 +382,6 @@ class InitialSyncHandler:
            requester.user.to_string(),
            messages,
            is_peeking=is_peeking,
-            msc4115_membership_on_events=self.hs.config.experimental.msc4115_membership_on_events,
        )

        start_token = StreamToken.START.copy_and_replace(StreamKeyType.ROOM, token)
@@ -498,7 +496,6 @@ class InitialSyncHandler:
            requester.user.to_string(),
            messages,
            is_peeking=is_peeking,
-            msc4115_membership_on_events=self.hs.config.experimental.msc4115_membership_on_events,
        )

        start_token = now_token.copy_and_replace(StreamKeyType.ROOM, token)
@@ -201,7 +201,7 @@ class MessageHandler:

        if at_token:
            last_event_id = (
-                await self.store.get_last_event_in_room_before_stream_ordering(
+                await self.store.get_last_event_id_in_room_before_stream_ordering(
                    room_id,
                    end_token=at_token.room_key,
                )
@@ -1551,6 +1551,7 @@ class EventCreationHandler:
                    # stream_ordering entry manually (as it was persisted on
                    # another worker).
                    event.internal_metadata.stream_ordering = stream_id
+                    event.internal_metadata.instance_name = writer_instance

                return event

@@ -27,7 +27,6 @@ from synapse.api.constants import Direction, EventTypes, Membership
 from synapse.api.errors import SynapseError
 from synapse.api.filtering import Filter
 from synapse.events.utils import SerializeEventConfig
-from synapse.handlers.room import ShutdownRoomParams, ShutdownRoomResponse
 from synapse.handlers.worker_lock import NEW_EVENT_DURING_PURGE_LOCK_NAME
 from synapse.logging.opentracing import trace
 from synapse.metrics.background_process_metrics import run_as_background_process
@@ -41,6 +40,7 @@ from synapse.types import (
    StreamKeyType,
    TaskStatus,
 )
+from synapse.types.handlers import ShutdownRoomParams, ShutdownRoomResponse
 from synapse.types.state import StateFilter
 from synapse.util.async_helpers import ReadWriteLock
 from synapse.visibility import filter_events_for_client
@@ -623,7 +623,6 @@ class PaginationHandler:
                user_id,
                events,
                is_peeking=(member_event_id is None),
-                msc4115_membership_on_events=self.hs.config.experimental.msc4115_membership_on_events,
            )

        # if after the filter applied there are no more events
@@ -95,7 +95,6 @@ class RelationsHandler:
        self._event_handler = hs.get_event_handler()
        self._event_serializer = hs.get_event_client_serializer()
        self._event_creation_handler = hs.get_event_creation_handler()
-        self._config = hs.config

    async def get_relations(
        self,
@@ -164,7 +163,6 @@ class RelationsHandler:
            user_id,
            events,
            is_peeking=(member_event_id is None),
-            msc4115_membership_on_events=self._config.experimental.msc4115_membership_on_events,
        )

        # The relations returned for the requested event do include their
@@ -610,7 +608,6 @@ class RelationsHandler:
            user_id,
            events,
            is_peeking=(member_event_id is None),
-            msc4115_membership_on_events=self._config.experimental.msc4115_membership_on_events,
        )

        aggregations = await self.get_bundled_aggregations(
@@ -40,7 +40,6 @@ from typing import (
 )

 import attr
-from typing_extensions import TypedDict

 import synapse.events.snapshot
 from synapse.api.constants import (
@@ -88,6 +87,7 @@ from synapse.types import (
    UserID,
    create_requester,
 )
+from synapse.types.handlers import ShutdownRoomParams, ShutdownRoomResponse
 from synapse.types.state import StateFilter
 from synapse.util import stringutils
 from synapse.util.caches.response_cache import ResponseCache
@@ -1476,7 +1476,6 @@ class RoomContextHandler:
                user.to_string(),
                events,
                is_peeking=is_peeking,
-                msc4115_membership_on_events=self.hs.config.experimental.msc4115_membership_on_events,
            )

        event = await self.store.get_event(
@@ -1780,63 +1779,6 @@ class RoomEventSource(EventSource[RoomStreamToken, EventBase]):
        return self.store.get_current_room_stream_token_for_room_id(room_id)


-class ShutdownRoomParams(TypedDict):
-    """
-    Attributes:
-        requester_user_id:
-            User who requested the action. Will be recorded as putting the room on the
-            blocking list.
-        new_room_user_id:
-            If set, a new room will be created with this user ID
-            as the creator and admin, and all users in the old room will be
-            moved into that room. If not set, no new room will be created
-            and the users will just be removed from the old room.
-        new_room_name:
-            A string representing the name of the room that new users will
-            be invited to. Defaults to `Content Violation Notification`
-        message:
-            A string containing the first message that will be sent as
-            `new_room_user_id` in the new room. Ideally this will clearly
-            convey why the original room was shut down.
-            Defaults to `Sharing illegal content on this server is not
-            permitted and rooms in violation will be blocked.`
-        block:
-            If set to `true`, this room will be added to a blocking list,
-            preventing future attempts to join the room. Defaults to `false`.
-        purge:
-            If set to `true`, purge the given room from the database.
-        force_purge:
-            If set to `true`, the room will be purged from database
-            even if there are still users joined to the room.
-    """
-
-    requester_user_id: Optional[str]
-    new_room_user_id: Optional[str]
-    new_room_name: Optional[str]
-    message: Optional[str]
-    block: bool
-    purge: bool
-    force_purge: bool
-
-
-class ShutdownRoomResponse(TypedDict):
-    """
-    Attributes:
-        kicked_users: An array of users (`user_id`) that were kicked.
-        failed_to_kick_users:
-            An array of users (`user_id`) that that were not kicked.
-        local_aliases:
-            An array of strings representing the local aliases that were
-            migrated from the old room to the new.
-        new_room_id: A string representing the room ID of the new room.
-    """
-
-    kicked_users: List[str]
-    failed_to_kick_users: List[str]
-    local_aliases: List[str]
-    new_room_id: Optional[str]
-
-
 class RoomShutdownHandler:
    DEFAULT_MESSAGE = (
        "Sharing illegal content on this server is not permitted and rooms in"
@@ -483,7 +483,6 @@ class SearchHandler:
            self._storage_controllers,
            user.to_string(),
            filtered_events,
-            msc4115_membership_on_events=self.hs.config.experimental.msc4115_membership_on_events,
        )

        events.sort(key=lambda e: -rank_map[e.event_id])
@@ -585,7 +584,6 @@ class SearchHandler:
                self._storage_controllers,
                user.to_string(),
                filtered_events,
-                msc4115_membership_on_events=self.hs.config.experimental.msc4115_membership_on_events,
            )

            room_events.extend(events)
@@ -673,14 +671,12 @@ class SearchHandler:
                self._storage_controllers,
                user.to_string(),
                res.events_before,
-                msc4115_membership_on_events=self.hs.config.experimental.msc4115_membership_on_events,
            )

            events_after = await filter_events_for_client(
                self._storage_controllers,
                user.to_string(),
                res.events_after,
-                msc4115_membership_on_events=self.hs.config.experimental.msc4115_membership_on_events,
            )

            context: JsonDict = {
@@ -0,0 +1,667 @@
+#
+# This file is licensed under the Affero General Public License (AGPL) version 3.
+#
+# Copyright (C) 2024 New Vector, Ltd
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# See the GNU Affero General Public License for more details:
+# <https://www.gnu.org/licenses/agpl-3.0.html>.
+#
+# Originally licensed under the Apache License, Version 2.0:
+# <http://www.apache.org/licenses/LICENSE-2.0>.
+#
+# [This file includes modifications made by New Vector Limited]
+#
+#
+import logging
+from typing import TYPE_CHECKING, Dict, List, Optional, Tuple
+
+from immutabledict import immutabledict
+
+from synapse.api.constants import AccountDataTypes, EventTypes, Membership
+from synapse.events import EventBase
+from synapse.storage.roommember import RoomsForUser
+from synapse.types import (
+    PersistedEventPosition,
+    Requester,
+    RoomStreamToken,
+    StreamToken,
+    UserID,
+)
+from synapse.types.handlers import OperationType, SlidingSyncConfig, SlidingSyncResult
+from synapse.types.state import StateFilter
+
+if TYPE_CHECKING:
+    from synapse.server import HomeServer
+
+logger = logging.getLogger(__name__)
+
+
+def convert_event_to_rooms_for_user(event: EventBase) -> RoomsForUser:
+    """
+    Quick helper to convert an event to a `RoomsForUser` object.
+    """
+    # These fields should be present for all persisted events
+    assert event.internal_metadata.stream_ordering is not None
+    assert event.internal_metadata.instance_name is not None
+
+    return RoomsForUser(
+        room_id=event.room_id,
+        sender=event.sender,
+        membership=event.membership,
+        event_id=event.event_id,
+        event_pos=PersistedEventPosition(
+            event.internal_metadata.instance_name,
+            event.internal_metadata.stream_ordering,
+        ),
+        room_version_id=event.room_version.identifier,
+    )
+
+
+def filter_membership_for_sync(*, membership: str, user_id: str, sender: str) -> bool:
+    """
+    Returns True if the membership event should be included in the sync response,
+    otherwise False.
+
+    Attributes:
+        membership: The membership state of the user in the room.
+        user_id: The user ID that the membership applies to
+        sender: The person who sent the membership event
+    """
+
+    # Everything except `Membership.LEAVE` because we want everything that's *still*
+    # relevant to the user. There are few more things to include in the sync response
+    # (newly_left) but those are handled separately.
+    #
+    # This logic includes kicks (leave events where the sender is not the same user) and
+    # can be read as "anything that isn't a leave or a leave with a different sender".
+    return membership != Membership.LEAVE or sender != user_id
+
+
+class SlidingSyncHandler:
+    def __init__(self, hs: "HomeServer"):
+        self.clock = hs.get_clock()
+        self.store = hs.get_datastores().main
+        self.storage_controllers = hs.get_storage_controllers()
+        self.auth_blocking = hs.get_auth_blocking()
+        self.notifier = hs.get_notifier()
+        self.event_sources = hs.get_event_sources()
+        self.rooms_to_exclude_globally = hs.config.server.rooms_to_exclude_from_sync
+
+    async def wait_for_sync_for_user(
+        self,
+        requester: Requester,
+        sync_config: SlidingSyncConfig,
+        from_token: Optional[StreamToken] = None,
+        timeout_ms: int = 0,
+    ) -> SlidingSyncResult:
+        """
+        Get the sync for a client if we have new data for it now. Otherwise
+        wait for new data to arrive on the server. If the timeout expires, then
+        return an empty sync result.
+
+        Args:
+            requester: The user making the request
+            sync_config: Sync configuration
+            from_token: The point in the stream to sync from. Token of the end of the
+                previous batch. May be `None` if this is the initial sync request.
+            timeout_ms: The time in milliseconds to wait for new data to arrive. If 0,
+                we will immediately but there might not be any new data so we just return an
+                empty response.
+        """
+        # If the user is not part of the mau group, then check that limits have
+        # not been exceeded (if not part of the group by this point, almost certain
+        # auth_blocking will occur)
+        await self.auth_blocking.check_auth_blocking(requester=requester)
+
+        # TODO: If the To-Device extension is enabled and we have a `from_token`, delete
+        # any to-device messages before that token (since we now know that the device
+        # has received them). (see sync v2 for how to do this)
+
+        # If we're working with a user-provided token, we need to make sure to wait for
+        # this worker to catch up with the token so we don't skip past any incoming
+        # events or future events if the user is nefariously, manually modifying the
+        # token.
+        if from_token is not None:
+            # We need to make sure this worker has caught up with the token. If
+            # this returns false, it means we timed out waiting, and we should
+            # just return an empty response.
+            before_wait_ts = self.clock.time_msec()
+            if not await self.notifier.wait_for_stream_token(from_token):
+                logger.warning(
+                    "Timed out waiting for worker to catch up. Returning empty response"
+                )
+                return SlidingSyncResult.empty(from_token)
+
+            # If we've spent significant time waiting to catch up, take it off
+            # the timeout.
+            after_wait_ts = self.clock.time_msec()
+            if after_wait_ts - before_wait_ts > 1_000:
+                timeout_ms -= after_wait_ts - before_wait_ts
+                timeout_ms = max(timeout_ms, 0)
+
+        # We're going to respond immediately if the timeout is 0 or if this is an
+        # initial sync (without a `from_token`) so we can avoid calling
+        # `notifier.wait_for_events()`.
+        if timeout_ms == 0 or from_token is None:
+            now_token = self.event_sources.get_current_token()
+            result = await self.current_sync_for_user(
+                sync_config,
+                from_token=from_token,
+                to_token=now_token,
+            )
+        else:
+            # Otherwise, we wait for something to happen and report it to the user.
+            async def current_sync_callback(
+                before_token: StreamToken, after_token: StreamToken
+            ) -> SlidingSyncResult:
+                return await self.current_sync_for_user(
+                    sync_config,
+                    from_token=from_token,
+                    to_token=after_token,
+                )
+
+            result = await self.notifier.wait_for_events(
+                sync_config.user.to_string(),
+                timeout_ms,
+                current_sync_callback,
+                from_token=from_token,
+            )
+
+        return result
+
+    async def current_sync_for_user(
+        self,
+        sync_config: SlidingSyncConfig,
+        to_token: StreamToken,
+        from_token: Optional[StreamToken] = None,
+    ) -> SlidingSyncResult:
+        """
+        Generates the response body of a Sliding Sync result, represented as a
+        `SlidingSyncResult`.
+
+        We fetch data according to the token range (> `from_token` and <= `to_token`).
+
+        Args:
+            sync_config: Sync configuration
+            to_token: The point in the stream to sync up to.
+            from_token: The point in the stream to sync from. Token of the end of the
+                previous batch. May be `None` if this is the initial sync request.
+        """
+        user_id = sync_config.user.to_string()
+        app_service = self.store.get_app_service_by_user_id(user_id)
+        if app_service:
+            # We no longer support AS users using /sync directly.
+            # See https://github.com/matrix-org/matrix-doc/issues/1144
+            raise NotImplementedError()
+
+        # Assemble sliding window lists
+        lists: Dict[str, SlidingSyncResult.SlidingWindowList] = {}
+        if sync_config.lists:
+            # Get all of the room IDs that the user should be able to see in the sync
+            # response
+            sync_room_map = await self.get_sync_room_ids_for_user(
+                sync_config.user,
+                from_token=from_token,
+                to_token=to_token,
+            )
+
+            for list_key, list_config in sync_config.lists.items():
+                # Apply filters
+                filtered_sync_room_map = sync_room_map
+                if list_config.filters is not None:
+                    filtered_sync_room_map = await self.filter_rooms(
+                        sync_config.user, sync_room_map, list_config.filters, to_token
+                    )
+
+                sorted_room_info = await self.sort_rooms(
+                    filtered_sync_room_map, to_token
+                )
+
+                ops: List[SlidingSyncResult.SlidingWindowList.Operation] = []
+                if list_config.ranges:
+                    for range in list_config.ranges:
+                        ops.append(
+                            SlidingSyncResult.SlidingWindowList.Operation(
+                                op=OperationType.SYNC,
+                                range=range,
+                                room_ids=[
+                                    room_id
+                                    for room_id, _ in sorted_room_info[
+                                        range[0] : range[1]
+                                    ]
+                                ],
+                            )
+                        )
+
+                lists[list_key] = SlidingSyncResult.SlidingWindowList(
+                    count=len(sorted_room_info),
+                    ops=ops,
+                )
+
+        return SlidingSyncResult(
+            next_pos=to_token,
+            lists=lists,
+            # TODO: Gather room data for rooms in lists and `sync_config.room_subscriptions`
+            rooms={},
+            extensions={},
+        )
+
+    async def get_sync_room_ids_for_user(
+        self,
+        user: UserID,
+        to_token: StreamToken,
+        from_token: Optional[StreamToken] = None,
+    ) -> Dict[str, RoomsForUser]:
+        """
+        Fetch room IDs that should be listed for this user in the sync response (the
+        full room list that will be filtered, sorted, and sliced).
+
+        We're looking for rooms where the user has the following state in the token
+        range (> `from_token` and <= `to_token`):
+
+        - `invite`, `join`, `knock`, `ban` membership events
+        - Kicks (`leave` membership events where `sender` is different from the
+          `user_id`/`state_key`)
+        - `newly_left` (rooms that were left during the given token range)
+        - In order for bans/kicks to not show up in sync, you need to `/forget` those
+          rooms. This doesn't modify the event itself though and only adds the
+          `forgotten` flag to the `room_memberships` table in Synapse. There isn't a way
+          to tell when a room was forgotten at the moment so we can't factor it into the
+          from/to range.
+
+        Args:
+            user: User to fetch rooms for
+            to_token: The token to fetch rooms up to.
+            from_token: The point in the stream to sync from.
+
+        Returns:
+            A dictionary of room IDs that should be listed in the sync response along
+            with membership information in that room at the time of `to_token`.
+        """
+        user_id = user.to_string()
+
+        # First grab a current snapshot rooms for the user
+        # (also handles forgotten rooms)
+        room_for_user_list = await self.store.get_rooms_for_local_user_where_membership_is(
+            user_id=user_id,
+            # We want to fetch any kind of membership (joined and left rooms) in order
+            # to get the `event_pos` of the latest room membership event for the
+            # user.
+            #
+            # We will filter out the rooms that don't belong below (see
+            # `filter_membership_for_sync`)
+            membership_list=Membership.LIST,
+            excluded_rooms=self.rooms_to_exclude_globally,
+        )
+
+        # If the user has never joined any rooms before, we can just return an empty list
+        if not room_for_user_list:
+            return {}
+
+        # Our working list of rooms that can show up in the sync response
+        sync_room_id_set = {
+            room_for_user.room_id: room_for_user
+            for room_for_user in room_for_user_list
+            if filter_membership_for_sync(
+                membership=room_for_user.membership,
+                user_id=user_id,
+                sender=room_for_user.sender,
+            )
+        }
+
+        # Get the `RoomStreamToken` that represents the spot we queried up to when we got
+        # our membership snapshot from `get_rooms_for_local_user_where_membership_is()`.
+        #
+        # First, we need to get the max stream_ordering of each event persister instance
+        # that we queried events from.
+        instance_to_max_stream_ordering_map: Dict[str, int] = {}
+        for room_for_user in room_for_user_list:
+            instance_name = room_for_user.event_pos.instance_name
+            stream_ordering = room_for_user.event_pos.stream
+
+            current_instance_max_stream_ordering = (
+                instance_to_max_stream_ordering_map.get(instance_name)
+            )
+            if (
+                current_instance_max_stream_ordering is None
+                or stream_ordering > current_instance_max_stream_ordering
+            ):
+                instance_to_max_stream_ordering_map[instance_name] = stream_ordering
+
+        # Then assemble the `RoomStreamToken`
+        membership_snapshot_token = RoomStreamToken(
+            # Minimum position in the `instance_map`
+            stream=min(instance_to_max_stream_ordering_map.values()),
+            instance_map=immutabledict(instance_to_max_stream_ordering_map),
+        )
+
+        # Since we fetched the users room list at some point in time after the from/to
+        # tokens, we need to revert/rewind some membership changes to match the point in
+        # time of the `to_token`. In particular, we need to make these fixups:
+        #
+        # - 1a) Remove rooms that the user joined after the `to_token`
+        # - 1b) Add back rooms that the user left after the `to_token`
+        # - 2) Add back newly_left rooms (> `from_token` and <= `to_token`)
+        #
+        # Below, we're doing two separate lookups for membership changes. We could
+        # request everything for both fixups in one range, [`from_token.room_key`,
+        # `membership_snapshot_token`), but we want to avoid raw `stream_ordering`
+        # comparison without `instance_name` (which is flawed). We could refactor
+        # `event.internal_metadata` to include `instance_name` but it might turn out a
+        # little difficult and a bigger, broader Synapse change than we want to make.
+
+        # 1) -----------------------------------------------------
+
+        # 1) Fetch membership changes that fall in the range from `to_token` up to
+        # `membership_snapshot_token`
+        #
+        # If our `to_token` is already the same or ahead of the latest room membership
+        # for the user, we don't need to do any "2)" fix-ups and can just straight-up
+        # use the room list from the snapshot as a base (nothing has changed)
+        membership_change_events_after_to_token = []
+        if not membership_snapshot_token.is_before_or_eq(to_token.room_key):
+            membership_change_events_after_to_token = (
+                await self.store.get_membership_changes_for_user(
+                    user_id,
+                    from_key=to_token.room_key,
+                    to_key=membership_snapshot_token,
+                    excluded_rooms=self.rooms_to_exclude_globally,
+                )
+            )
+
+        # 1) Assemble a list of the last membership events in some given ranges. Someone
+        # could have left and joined multiple times during the given range but we only
+        # care about end-result so we grab the last one.
+        last_membership_change_by_room_id_after_to_token: Dict[str, EventBase] = {}
+        # We also need the first membership event after the `to_token` so we can step
+        # backward to the previous membership that would apply to the from/to range.
+        first_membership_change_by_room_id_after_to_token: Dict[str, EventBase] = {}
+        for event in membership_change_events_after_to_token:
+            last_membership_change_by_room_id_after_to_token[event.room_id] = event
+            # Only set if we haven't already set it
+            first_membership_change_by_room_id_after_to_token.setdefault(
+                event.room_id, event
+            )
+
+        # 1) Fixup
+        for (
+            last_membership_change_after_to_token
+        ) in last_membership_change_by_room_id_after_to_token.values():
+            room_id = last_membership_change_after_to_token.room_id
+
+            # We want to find the first membership change after the `to_token` then step
+            # backward to know the membership in the from/to range.
+            first_membership_change_after_to_token = (
+                first_membership_change_by_room_id_after_to_token.get(room_id)
+            )
+            assert first_membership_change_after_to_token is not None, (
+                "If there was a `last_membership_change_after_to_token` that we're iterating over, "
+                + "then there should be corresponding a first change. For example, even if there "
+                + "is only one event after the `to_token`, the first and last event will be same event. "
+                + "This is probably a mistake in assembling the `last_membership_change_by_room_id_after_to_token`"
+                + "/`first_membership_change_by_room_id_after_to_token` dicts above."
+            )
+            # TODO: Instead of reading from `unsigned`, refactor this to use the
+            # `current_state_delta_stream` table in the future. Probably a new
+            # `get_membership_changes_for_user()` function that uses
+            # `current_state_delta_stream` with a join to `room_memberships`. This would
+            # help in state reset scenarios since `prev_content` is looking at the
+            # current branch vs the current room state. This is all just data given to
+            # the client so no real harm to data integrity, but we'd like to be nice to
+            # the client. Since the `current_state_delta_stream` table is new, it
+            # doesn't have all events in it. Since this is Sliding Sync, if we ever need
+            # to, we can signal the client to throw all of their state away by sending
+            # "operation: RESET".
+            prev_content = first_membership_change_after_to_token.unsigned.get(
+                "prev_content", {}
+            )
+            prev_membership = prev_content.get("membership", None)
+            prev_sender = first_membership_change_after_to_token.unsigned.get(
+                "prev_sender", None
+            )
+
+            # Check if the previous membership (membership that applies to the from/to
+            # range) should be included in our `sync_room_id_set`
+            should_prev_membership_be_included = (
+                prev_membership is not None
+                and prev_sender is not None
+                and filter_membership_for_sync(
+                    membership=prev_membership,
+                    user_id=user_id,
+                    sender=prev_sender,
+                )
+            )
+
+            # Check if the last membership (membership that applies to our snapshot) was
+            # already included in our `sync_room_id_set`
+            was_last_membership_already_included = filter_membership_for_sync(
+                membership=last_membership_change_after_to_token.membership,
+                user_id=user_id,
+                sender=last_membership_change_after_to_token.sender,
+            )
+
+            # 1a) Add back rooms that the user left after the `to_token`
+            #
+            # For example, if the last membership event after the `to_token` is a leave
+            # event, then the room was excluded from `sync_room_id_set` when we first
+            # crafted it above. We should add these rooms back as long as the user also
+            # was part of the room before the `to_token`.
+            if (
+                not was_last_membership_already_included
+                and should_prev_membership_be_included
+            ):
+                sync_room_id_set[room_id] = convert_event_to_rooms_for_user(
+                    last_membership_change_after_to_token
+                )
+            # 1b) Remove rooms that the user joined (hasn't left) after the `to_token`
+            #
+            # For example, if the last membership event after the `to_token` is a "join"
+            # event, then the room was included `sync_room_id_set` when we first crafted
+            # it above. We should remove these rooms as long as the user also wasn't
+            # part of the room before the `to_token`.
+            elif (
+                was_last_membership_already_included
+                and not should_prev_membership_be_included
+            ):
+                del sync_room_id_set[room_id]
+
+        # 2) -----------------------------------------------------
+        # We fix-up newly_left rooms after the first fixup because it may have removed
+        # some left rooms that we can figure out our newly_left in the following code
+
+        # 2) Fetch membership changes that fall in the range from `from_token` up to `to_token`
+        membership_change_events_in_from_to_range = []
+        if from_token:
+            membership_change_events_in_from_to_range = (
+                await self.store.get_membership_changes_for_user(
+                    user_id,
+                    from_key=from_token.room_key,
+                    to_key=to_token.room_key,
+                    excluded_rooms=self.rooms_to_exclude_globally,
+                )
+            )
+
+        # 2) Assemble a list of the last membership events in some given ranges. Someone
+        # could have left and joined multiple times during the given range but we only
+        # care about end-result so we grab the last one.
+        last_membership_change_by_room_id_in_from_to_range: Dict[str, EventBase] = {}
+        for event in membership_change_events_in_from_to_range:
+            last_membership_change_by_room_id_in_from_to_range[event.room_id] = event
+
+        # 2) Fixup
+        for (
+            last_membership_change_in_from_to_range
+        ) in last_membership_change_by_room_id_in_from_to_range.values():
+            room_id = last_membership_change_in_from_to_range.room_id
+
+            # 2) Add back newly_left rooms (> `from_token` and <= `to_token`). We
+            # include newly_left rooms because the last event that the user should see
+            # is their own leave event
+            if last_membership_change_in_from_to_range.membership == Membership.LEAVE:
+                sync_room_id_set[room_id] = convert_event_to_rooms_for_user(
+                    last_membership_change_in_from_to_range
+                )
+
+        return sync_room_id_set
+
+    async def filter_rooms(
+        self,
+        user: UserID,
+        sync_room_map: Dict[str, RoomsForUser],
+        filters: SlidingSyncConfig.SlidingSyncList.Filters,
+        to_token: StreamToken,
+    ) -> Dict[str, RoomsForUser]:
+        """
+        Filter rooms based on the sync request.
+
+        Args:
+            user: User to filter rooms for
+            sync_room_map: Dictionary of room IDs to sort along with membership
+                information in the room at the time of `to_token`.
+            filters: Filters to apply
+            to_token: We filter based on the state of the room at this token
+
+        Returns:
+            A filtered dictionary of room IDs along with membership information in the
+            room at the time of `to_token`.
+        """
+        user_id = user.to_string()
+
+        # TODO: Apply filters
+        #
+        # TODO: Exclude partially stated rooms unless the `required_state` has
+        # `["m.room.member", "$LAZY"]`
+
+        filtered_room_id_set = set(sync_room_map.keys())
+
+        # Filter for Direct-Message (DM) rooms
+        if filters.is_dm is not None:
+            # We're using global account data (`m.direct`) instead of checking for
+            # `is_direct` on membership events because that property only appears for
+            # the invitee membership event (doesn't show up for the inviter). Account
+            # data is set by the client so it needs to be scrutinized.
+            #
+            # We're unable to take `to_token` into account for global account data since
+            # we only keep track of the latest account data for the user.
+            dm_map = await self.store.get_global_account_data_by_type_for_user(
+                user_id, AccountDataTypes.DIRECT
+            )
+
+            # Flatten out the map
+            dm_room_id_set = set()
+            if dm_map:
+                for room_ids in dm_map.values():
+                    # Account data should be a list of room IDs. Ignore anything else
+                    if isinstance(room_ids, list):
+                        for room_id in room_ids:
+                            if isinstance(room_id, str):
+                                dm_room_id_set.add(room_id)
+
+            if filters.is_dm:
+                # Only DM rooms please
+                filtered_room_id_set = filtered_room_id_set.intersection(dm_room_id_set)
+            else:
+                # Only non-DM rooms please
+                filtered_room_id_set = filtered_room_id_set.difference(dm_room_id_set)
+
+        if filters.spaces:
+            raise NotImplementedError()
+
+        # Filter for encrypted rooms
+        if filters.is_encrypted is not None:
+            # Make a copy so we don't run into an error: `Set changed size during
+            # iteration`, when we filter out and remove items
+            for room_id in list(filtered_room_id_set):
+                state_at_to_token = await self.storage_controllers.state.get_state_at(
+                    room_id,
+                    to_token,
+                    state_filter=StateFilter.from_types(
+                        [(EventTypes.RoomEncryption, "")]
+                    ),
+                )
+                is_encrypted = state_at_to_token.get((EventTypes.RoomEncryption, ""))
+
+                # If we're looking for encrypted rooms, filter out rooms that are not
+                # encrypted and vice versa
+                if (filters.is_encrypted and not is_encrypted) or (
+                    not filters.is_encrypted and is_encrypted
+                ):
+                    filtered_room_id_set.remove(room_id)
+
+        if filters.is_invite:
+            raise NotImplementedError()
+
+        if filters.room_types:
+            raise NotImplementedError()
+
+        if filters.not_room_types:
+            raise NotImplementedError()
+
+        if filters.room_name_like:
+            raise NotImplementedError()
+
+        if filters.tags:
+            raise NotImplementedError()
+
+        if filters.not_tags:
+            raise NotImplementedError()
+
+        # Assemble a new sync room map but only with the `filtered_room_id_set`
+        return {room_id: sync_room_map[room_id] for room_id in filtered_room_id_set}
+
+    async def sort_rooms(
+        self,
+        sync_room_map: Dict[str, RoomsForUser],
+        to_token: StreamToken,
+    ) -> List[Tuple[str, RoomsForUser]]:
+        """
+        Sort by `stream_ordering` of the last event that the user should see in the
+        room. `stream_ordering` is unique so we get a stable sort.
+
+        Args:
+            sync_room_map: Dictionary of room IDs to sort along with membership
+                information in the room at the time of `to_token`.
+            to_token: We sort based on the events in the room at this token (<= `to_token`)
+
+        Returns:
+            A sorted list of room IDs by `stream_ordering` along with membership information.
+        """
+
+        # Assemble a map of room ID to the `stream_ordering` of the last activity that the
+        # user should see in the room (<= `to_token`)
+        last_activity_in_room_map: Dict[str, int] = {}
+        for room_id, room_for_user in sync_room_map.items():
+            # If they are fully-joined to the room, let's find the latest activity
+            # at/before the `to_token`.
+            if room_for_user.membership == Membership.JOIN:
+                last_event_result = (
+                    await self.store.get_last_event_pos_in_room_before_stream_ordering(
+                        room_id, to_token.room_key
+                    )
+                )
+
+                # If the room has no events at/before the `to_token`, this is probably a
+                # mistake in the code that generates the `sync_room_map` since that should
+                # only give us rooms that the user had membership in during the token range.
+                assert last_event_result is not None
+
+                _, event_pos = last_event_result
+
+                last_activity_in_room_map[room_id] = event_pos.stream
+            else:
+                # Otherwise, if the user has left/been invited/knocked/been banned from
+                # a room, they shouldn't see anything past that point.
+                last_activity_in_room_map[room_id] = room_for_user.event_pos.stream
+
+        return sorted(
+            sync_room_map.items(),
+            # Sort by the last activity (stream_ordering) in the room
+            key=lambda room_info: last_activity_in_room_map[room_info[0]],
+            # We want descending order
+            reverse=True,
+        )
@@ -844,7 +844,6 @@ class SyncHandler:
                    sync_config.user.to_string(),
                    recents,
                    always_include_ids=current_state_ids,
-                    msc4115_membership_on_events=self.hs_config.experimental.msc4115_membership_on_events,
                )
                log_kv({"recents_after_visibility_filtering": len(recents)})
            else:
@@ -930,7 +929,6 @@ class SyncHandler:
                    sync_config.user.to_string(),
                    loaded_recents,
                    always_include_ids=current_state_ids,
-                    msc4115_membership_on_events=self.hs_config.experimental.msc4115_membership_on_events,
                )

                loaded_recents = []
@@ -981,89 +979,6 @@ class SyncHandler:
            bundled_aggregations=bundled_aggregations,
        )

-    async def get_state_after_event(
-        self,
-        event_id: str,
-        state_filter: Optional[StateFilter] = None,
-        await_full_state: bool = True,
-    ) -> StateMap[str]:
-        """
-        Get the room state after the given event
-
-        Args:
-            event_id: event of interest
-            state_filter: The state filter used to fetch state from the database.
-            await_full_state: if `True`, will block if we do not yet have complete state
-                at the event and `state_filter` is not satisfied by partial state.
-                Defaults to `True`.
-        """
-        state_ids = await self._state_storage_controller.get_state_ids_for_event(
-            event_id,
-            state_filter=state_filter or StateFilter.all(),
-            await_full_state=await_full_state,
-        )
-
-        # using get_metadata_for_events here (instead of get_event) sidesteps an issue
-        # with redactions: if `event_id` is a redaction event, and we don't have the
-        # original (possibly because it got purged), get_event will refuse to return
-        # the redaction event, which isn't terribly helpful here.
-        #
-        # (To be fair, in that case we could assume it's *not* a state event, and
-        # therefore we don't need to worry about it. But still, it seems cleaner just
-        # to pull the metadata.)
-        m = (await self.store.get_metadata_for_events([event_id]))[event_id]
-        if m.state_key is not None and m.rejection_reason is None:
-            state_ids = dict(state_ids)
-            state_ids[(m.event_type, m.state_key)] = event_id
-
-        return state_ids
-
-    async def get_state_at(
-        self,
-        room_id: str,
-        stream_position: StreamToken,
-        state_filter: Optional[StateFilter] = None,
-        await_full_state: bool = True,
-    ) -> StateMap[str]:
-        """Get the room state at a particular stream position
-
-        Args:
-            room_id: room for which to get state
-            stream_position: point at which to get state
-            state_filter: The state filter used to fetch state from the database.
-            await_full_state: if `True`, will block if we do not yet have complete state
-                at the last event in the room before `stream_position` and
-                `state_filter` is not satisfied by partial state. Defaults to `True`.
-        """
-        # FIXME: This gets the state at the latest event before the stream ordering,
-        # which might not be the same as the "current state" of the room at the time
-        # of the stream token if there were multiple forward extremities at the time.
-        last_event_id = await self.store.get_last_event_in_room_before_stream_ordering(
-            room_id,
-            end_token=stream_position.room_key,
-        )
-
-        if last_event_id:
-            state = await self.get_state_after_event(
-                last_event_id,
-                state_filter=state_filter or StateFilter.all(),
-                await_full_state=await_full_state,
-            )
-
-        else:
-            # no events in this room - so presumably no state
-            state = {}
-
-            # (erikj) This should be rarely hit, but we've had some reports that
-            # we get more state down gappy syncs than we should, so let's add
-            # some logging.
-            logger.info(
-                "Failed to find any events in room %s at %s",
-                room_id,
-                stream_position.room_key,
-            )
-        return state
-
    async def compute_summary(
        self,
        room_id: str,
@@ -1437,7 +1352,7 @@ class SyncHandler:
            await_full_state = True
            lazy_load_members = False

-        state_at_timeline_end = await self.get_state_at(
+        state_at_timeline_end = await self._state_storage_controller.get_state_at(
            room_id,
            stream_position=end_token,
            state_filter=state_filter,
@@ -1521,7 +1436,7 @@ class SyncHandler:
            # We need to make sure the first event in our batch points to the
            # last event in the previous batch.
            last_event_id_prev_batch = (
-                await self.store.get_last_event_in_room_before_stream_ordering(
+                await self.store.get_last_event_id_in_room_before_stream_ordering(
                    room_id,
                    end_token=since_token.room_key,
                )
@@ -1565,7 +1480,7 @@ class SyncHandler:
        else:
            # We can get here if the user has ignored the senders of all
            # the recent events.
-            state_at_timeline_start = await self.get_state_at(
+            state_at_timeline_start = await self._state_storage_controller.get_state_at(
                room_id,
                stream_position=end_token,
                state_filter=state_filter,
@@ -1587,14 +1502,14 @@ class SyncHandler:
            # about them).
            state_filter = StateFilter.all()

-        state_at_previous_sync = await self.get_state_at(
+        state_at_previous_sync = await self._state_storage_controller.get_state_at(
            room_id,
            stream_position=since_token,
            state_filter=state_filter,
            await_full_state=await_full_state,
        )

-        state_at_timeline_end = await self.get_state_at(
+        state_at_timeline_end = await self._state_storage_controller.get_state_at(
            room_id,
            stream_position=end_token,
            state_filter=state_filter,
@@ -2002,7 +1917,7 @@ class SyncHandler:
        """
        user_id = sync_config.user.to_string()

-        # Note: we get the users room list *before* we get the current token, this
+        # Note: we get the users room list *before* we get the `now_token`, this
        # avoids checking back in history if rooms are joined after the token is fetched.
        token_before_rooms = self.event_sources.get_current_token()
        mutable_joined_room_ids = set(await self.store.get_rooms_for_user(user_id))
@@ -2014,10 +1929,10 @@ class SyncHandler:
        now_token = self.event_sources.get_current_token()
        log_kv({"now_token": now_token})

-        # Since we fetched the users room list before the token, there's a small window
-        # during which membership events may have been persisted, so we fetch these now
-        # and modify the joined room list for any changes between the get_rooms_for_user
-        # call and the get_current_token call.
+        # Since we fetched the users room list before calculating the `now_token` (see
+        # above), there's a small window during which membership events may have been
+        # persisted, so we fetch these now and modify the joined room list for any
+        # changes between the get_rooms_for_user call and the get_current_token call.
        membership_change_events = []
        if since_token:
            membership_change_events = await self.store.get_membership_changes_for_user(
@@ -2027,16 +1942,19 @@ class SyncHandler:
                self.rooms_to_exclude_globally,
            )

-            mem_last_change_by_room_id: Dict[str, EventBase] = {}
+            last_membership_change_by_room_id: Dict[str, EventBase] = {}
            for event in membership_change_events:
-                mem_last_change_by_room_id[event.room_id] = event
+                last_membership_change_by_room_id[event.room_id] = event

            # For the latest membership event in each room found, add/remove the room ID
            # from the joined room list accordingly. In this case we only care if the
            # latest change is JOIN.

-            for room_id, event in mem_last_change_by_room_id.items():
+            for room_id, event in last_membership_change_by_room_id.items():
                assert event.internal_metadata.stream_ordering
+                # As a shortcut, skip any events that happened before we got our
+                # `get_rooms_for_user()` snapshot (any changes are already represented
+                # in that list).
                if (
                    event.internal_metadata.stream_ordering
                    < token_before_rooms.room_key.stream
@@ -2590,7 +2508,7 @@ class SyncHandler:
                continue

            if room_id in sync_result_builder.joined_room_ids or has_join:
-                old_state_ids = await self.get_state_at(
+                old_state_ids = await self._state_storage_controller.get_state_at(
                    room_id,
                    since_token,
                    state_filter=StateFilter.from_types([(EventTypes.Member, user_id)]),
@@ -2620,12 +2538,14 @@ class SyncHandler:
                    newly_left_rooms.append(room_id)
                else:
                    if not old_state_ids:
-                        old_state_ids = await self.get_state_at(
-                            room_id,
-                            since_token,
-                            state_filter=StateFilter.from_types(
-                                [(EventTypes.Member, user_id)]
-                            ),
+                        old_state_ids = (
+                            await self._state_storage_controller.get_state_at(
+                                room_id,
+                                since_token,
+                                state_filter=StateFilter.from_types(
+                                    [(EventTypes.Member, user_id)]
+                                ),
+                            )
                        )
                        old_mem_ev_id = old_state_ids.get(
                            (EventTypes.Member, user_id), None
@@ -2830,7 +2750,7 @@ class SyncHandler:
                            continue

                leave_token = now_token.copy_and_replace(
-                    StreamKeyType.ROOM, RoomStreamToken(stream=event.stream_ordering)
+                    StreamKeyType.ROOM, RoomStreamToken(stream=event.event_pos.stream)
                )
                room_entries.append(
                    RoomSyncResultBuilder(
@@ -57,7 +57,7 @@ from twisted.internet.interfaces import IReactorTime
 from twisted.internet.task import Cooperator
 from twisted.web.client import ResponseFailed
 from twisted.web.http_headers import Headers
-from twisted.web.iweb import IAgent, IBodyProducer, IResponse
+from twisted.web.iweb import UNKNOWN_LENGTH, IAgent, IBodyProducer, IResponse

 import synapse.metrics
 import synapse.util.retryutils
@@ -68,6 +68,7 @@ from synapse.api.errors import (
    RequestSendFailed,
    SynapseError,
 )
+from synapse.api.ratelimiting import Ratelimiter
 from synapse.crypto.context_factory import FederationPolicyForHTTPS
 from synapse.http import QuieterFileBodyProducer
 from synapse.http.client import (
@@ -1411,9 +1412,11 @@ class MatrixFederationHttpClient:
        destination: str,
        path: str,
        output_stream: BinaryIO,
+        download_ratelimiter: Ratelimiter,
+        ip_address: str,
+        max_size: int,
        args: Optional[QueryParams] = None,
        retry_on_dns_fail: bool = True,
-        max_size: Optional[int] = None,
        ignore_backoff: bool = False,
        follow_redirects: bool = False,
    ) -> Tuple[int, Dict[bytes, List[bytes]]]:
@@ -1422,6 +1425,10 @@ class MatrixFederationHttpClient:
            destination: The remote server to send the HTTP request to.
            path: The HTTP path to GET.
            output_stream: File to write the response body to.
+            download_ratelimiter: a ratelimiter to limit remote media downloads, keyed to
+                requester IP
+            ip_address: IP address of the requester
+            max_size: maximum allowable size in bytes of the file
            args: Optional dictionary used to create the query string.
            ignore_backoff: true to ignore the historical backoff data
                and try the request anyway.
@@ -1441,11 +1448,27 @@ class MatrixFederationHttpClient:
                federation whitelist
            RequestSendFailed: If there were problems connecting to the
                remote, due to e.g. DNS failures, connection timeouts etc.
+            SynapseError: If the requested file exceeds ratelimits
        """
        request = MatrixFederationRequest(
            method="GET", destination=destination, path=path, query=args
        )

+        # check for a minimum balance of 1MiB in ratelimiter before initiating request
+        send_req, _ = await download_ratelimiter.can_do_action(
+            requester=None, key=ip_address, n_actions=1048576, update=False
+        )
+
+        if not send_req:
+            msg = "Requested file size exceeds ratelimits"
+            logger.warning(
+                "{%s} [%s] %s",
+                request.txn_id,
+                request.destination,
+                msg,
+            )
+            raise SynapseError(HTTPStatus.TOO_MANY_REQUESTS, msg, Codes.LIMIT_EXCEEDED)
+
        response = await self._send_request(
            request,
            retry_on_dns_fail=retry_on_dns_fail,
@@ -1455,12 +1478,36 @@ class MatrixFederationHttpClient:

        headers = dict(response.headers.getAllRawHeaders())

+        expected_size = response.length
+        # if we don't get an expected length then use the max length
+        if expected_size == UNKNOWN_LENGTH:
+            expected_size = max_size
+            logger.debug(
+                f"File size unknown, assuming file is max allowable size: {max_size}"
+            )
+
+        read_body, _ = await download_ratelimiter.can_do_action(
+            requester=None,
+            key=ip_address,
+            n_actions=expected_size,
+        )
+        if not read_body:
+            msg = "Requested file size exceeds ratelimits"
+            logger.warning(
+                "{%s} [%s] %s",
+                request.txn_id,
+                request.destination,
+                msg,
+            )
+            raise SynapseError(HTTPStatus.TOO_MANY_REQUESTS, msg, Codes.LIMIT_EXCEEDED)
+
        try:
-            d = read_body_with_max_size(response, output_stream, max_size)
+            # add a byte of headroom to max size as function errs at >=
+            d = read_body_with_max_size(response, output_stream, expected_size + 1)
            d.addTimeout(self.default_timeout_seconds, self.reactor)
            length = await make_deferred_yieldable(d)
        except BodyExceededMaxSize:
-            msg = "Requested file is too large > %r bytes" % (max_size,)
+            msg = "Requested file is too large > %r bytes" % (expected_size,)
            logger.warning(
                "{%s} [%s] %s",
                request.txn_id,
@@ -42,6 +42,7 @@ from synapse.api.errors import (
    SynapseError,
    cs_error,
 )
+from synapse.api.ratelimiting import Ratelimiter
 from synapse.config.repository import ThumbnailRequirement
 from synapse.http.server import respond_with_json
 from synapse.http.site import SynapseRequest
@@ -111,6 +112,12 @@ class MediaRepository:
        )
        self.prevent_media_downloads_from = hs.config.media.prevent_media_downloads_from

+        self.download_ratelimiter = Ratelimiter(
+            store=hs.get_storage_controllers().main,
+            clock=hs.get_clock(),
+            cfg=hs.config.ratelimiting.remote_media_downloads,
+        )
+
        # List of StorageProviders where we should search for media and
        # potentially upload to.
        storage_providers = []
@@ -464,6 +471,7 @@ class MediaRepository:
        media_id: str,
        name: Optional[str],
        max_timeout_ms: int,
+        ip_address: str,
    ) -> None:
        """Respond to requests for remote media.

@@ -475,6 +483,7 @@ class MediaRepository:
                the filename in the Content-Disposition header of the response.
            max_timeout_ms: the maximum number of milliseconds to wait for the
                media to be uploaded.
+            ip_address: the IP address of the requester

        Returns:
            Resolves once a response has successfully been written to request
@@ -500,7 +509,11 @@ class MediaRepository:
        key = (server_name, media_id)
        async with self.remote_media_linearizer.queue(key):
            responder, media_info = await self._get_remote_media_impl(
-                server_name, media_id, max_timeout_ms
+                server_name,
+                media_id,
+                max_timeout_ms,
+                self.download_ratelimiter,
+                ip_address,
            )

        # We deliberately stream the file outside the lock
@@ -517,7 +530,7 @@ class MediaRepository:
            respond_404(request)

    async def get_remote_media_info(
-        self, server_name: str, media_id: str, max_timeout_ms: int
+        self, server_name: str, media_id: str, max_timeout_ms: int, ip_address: str
    ) -> RemoteMedia:
        """Gets the media info associated with the remote file, downloading
        if necessary.
@@ -527,6 +540,7 @@ class MediaRepository:
            media_id: The media ID of the content (as defined by the remote server).
            max_timeout_ms: the maximum number of milliseconds to wait for the
                media to be uploaded.
+            ip_address: IP address of the requester

        Returns:
            The media info of the file
@@ -542,7 +556,11 @@ class MediaRepository:
        key = (server_name, media_id)
        async with self.remote_media_linearizer.queue(key):
            responder, media_info = await self._get_remote_media_impl(
-                server_name, media_id, max_timeout_ms
+                server_name,
+                media_id,
+                max_timeout_ms,
+                self.download_ratelimiter,
+                ip_address,
            )

        # Ensure we actually use the responder so that it releases resources
@@ -553,7 +571,12 @@ class MediaRepository:
        return media_info

    async def _get_remote_media_impl(
-        self, server_name: str, media_id: str, max_timeout_ms: int
+        self,
+        server_name: str,
+        media_id: str,
+        max_timeout_ms: int,
+        download_ratelimiter: Ratelimiter,
+        ip_address: str,
    ) -> Tuple[Optional[Responder], RemoteMedia]:
        """Looks for media in local cache, if not there then attempt to
        download from remote server.
@@ -564,6 +587,9 @@ class MediaRepository:
                remote server).
            max_timeout_ms: the maximum number of milliseconds to wait for the
                media to be uploaded.
+            download_ratelimiter: a ratelimiter limiting remote media downloads, keyed to
+                requester IP.
+            ip_address: the IP address of the requester

        Returns:
            A tuple of responder and the media info of the file.
@@ -596,7 +622,7 @@ class MediaRepository:

        try:
            media_info = await self._download_remote_file(
-                server_name, media_id, max_timeout_ms
+                server_name, media_id, max_timeout_ms, download_ratelimiter, ip_address
            )
        except SynapseError:
            raise
@@ -630,6 +656,8 @@ class MediaRepository:
        server_name: str,
        media_id: str,
        max_timeout_ms: int,
+        download_ratelimiter: Ratelimiter,
+        ip_address: str,
    ) -> RemoteMedia:
        """Attempt to download the remote file from the given server name,
        using the given file_id as the local id.
@@ -641,6 +669,9 @@ class MediaRepository:
                locally generated.
            max_timeout_ms: the maximum number of milliseconds to wait for the
                media to be uploaded.
+            download_ratelimiter: a ratelimiter limiting remote media downloads, keyed to
+                requester IP
+            ip_address: the IP address of the requester

        Returns:
            The media info of the file.
@@ -658,6 +689,8 @@ class MediaRepository:
                    output_stream=f,
                    max_size=self.max_upload_size,
                    max_timeout_ms=max_timeout_ms,
+                    download_ratelimiter=download_ratelimiter,
+                    ip_address=ip_address,
                )
            except RequestSendFailed as e:
                logger.warning(
@@ -359,9 +359,10 @@ class ThumbnailProvider:
        desired_method: str,
        desired_type: str,
        max_timeout_ms: int,
+        ip_address: str,
    ) -> None:
        media_info = await self.media_repo.get_remote_media_info(
-            server_name, media_id, max_timeout_ms
+            server_name, media_id, max_timeout_ms, ip_address
        )
        if not media_info:
            respond_404(request)
@@ -422,12 +423,13 @@ class ThumbnailProvider:
        method: str,
        m_type: str,
        max_timeout_ms: int,
+        ip_address: str,
    ) -> None:
        # TODO: Don't download the whole remote file
        # We should proxy the thumbnail from the remote server instead of
        # downloading the remote file and generating our own thumbnails.
        media_info = await self.media_repo.get_remote_media_info(
-            server_name, media_id, max_timeout_ms
+            server_name, media_id, max_timeout_ms, ip_address
        )
        if not media_info:
            return
@@ -721,7 +721,6 @@ class Notifier:
                        user.to_string(),
                        new_events,
                        is_peeking=is_peeking,
-                        msc4115_membership_on_events=self.hs.config.experimental.msc4115_membership_on_events,
                    )
                elif keyname == StreamKeyType.PRESENCE:
                    now = self.clock.time_msec()
@@ -532,7 +532,6 @@ class Mailer:
            self._storage_controllers,
            user_id,
            results.events_before,
-            msc4115_membership_on_events=self.hs.config.experimental.msc4115_membership_on_events,
        )
        the_events.append(notif_event)

@@ -53,7 +53,7 @@ from synapse.rest.client import (
    register,
    relations,
    rendezvous,
-    report_event,
+    reporting,
    room,
    room_keys,
    room_upgrade_rest_servlet,
@@ -128,7 +128,7 @@ class ClientRestResource(JsonResource):
        tags.register_servlets(hs, client_resource)
        account_data.register_servlets(hs, client_resource)
        if is_main_process:
-            report_event.register_servlets(hs, client_resource)
+            reporting.register_servlets(hs, client_resource)
            openid.register_servlets(hs, client_resource)
        notifications.register_servlets(hs, client_resource)
        devices.register_servlets(hs, client_resource)
@@ -41,7 +41,6 @@ class ExperimentalFeature(str, Enum):

    MSC3026 = "msc3026"
    MSC3881 = "msc3881"
-    MSC3967 = "msc3967"


 class ExperimentalFeaturesRestServlet(RestServlet):
@@ -56,14 +56,14 @@ from synapse.http.servlet import (
 from synapse.http.site import SynapseRequest
 from synapse.metrics import threepid_send_requests
 from synapse.push.mailer import Mailer
-from synapse.rest.client.models import (
+from synapse.types import JsonDict
+from synapse.types.rest import RequestBodyModel
+from synapse.types.rest.client import (
    AuthenticationData,
    ClientSecretStr,
    EmailRequestTokenBody,
    MsisdnRequestTokenBody,
 )
-from synapse.rest.models import RequestBodyModel
-from synapse.types import JsonDict
 from synapse.util.msisdn import phone_number_to_msisdn
 from synapse.util.stringutils import assert_valid_client_secret, random_string
 from synapse.util.threepids import check_3pid_allowed, validate_email
@@ -42,9 +42,9 @@ from synapse.http.servlet import (
 )
 from synapse.http.site import SynapseRequest
 from synapse.rest.client._base import client_patterns, interactive_auth_handler
-from synapse.rest.client.models import AuthenticationData
-from synapse.rest.models import RequestBodyModel
 from synapse.types import JsonDict
+from synapse.types.rest import RequestBodyModel
+from synapse.types.rest.client import AuthenticationData

 if TYPE_CHECKING:
    from synapse.server import HomeServer
@@ -41,8 +41,8 @@ from synapse.http.servlet import (
 )
 from synapse.http.site import SynapseRequest
 from synapse.rest.client._base import client_patterns
-from synapse.rest.models import RequestBodyModel
 from synapse.types import JsonDict, RoomAlias
+from synapse.types.rest import RequestBodyModel

 if TYPE_CHECKING:
    from synapse.server import HomeServer
@@ -36,7 +36,6 @@ from synapse.http.servlet import (
 )
 from synapse.http.site import SynapseRequest
 from synapse.logging.opentracing import log_kv, set_tag
-from synapse.replication.http.devices import ReplicationUploadKeysForUserRestServlet
 from synapse.rest.client._base import client_patterns, interactive_auth_handler
 from synapse.types import JsonDict, StreamToken
 from synapse.util.cancellation import cancellable
@@ -105,13 +104,8 @@ class KeyUploadServlet(RestServlet):
        self.auth = hs.get_auth()
        self.e2e_keys_handler = hs.get_e2e_keys_handler()
        self.device_handler = hs.get_device_handler()
-
-        if hs.config.worker.worker_app is None:
-            # if main process
-            self.key_uploader = self.e2e_keys_handler.upload_keys_for_user
-        else:
-            # then a worker
-            self.key_uploader = ReplicationUploadKeysForUserRestServlet.make_client(hs)
+        self._clock = hs.get_clock()
+        self._store = hs.get_datastores().main

    async def on_POST(
        self, request: SynapseRequest, device_id: Optional[str]
@@ -151,9 +145,10 @@ class KeyUploadServlet(RestServlet):
                400, "To upload keys, you must pass device_id when authenticating"
            )

-        result = await self.key_uploader(
+        result = await self.e2e_keys_handler.upload_keys_for_user(
            user_id=user_id, device_id=device_id, keys=body
        )
+
        return 200, result


@@ -387,44 +382,35 @@ class SigningKeyUploadServlet(RestServlet):
            master_key_updatable_without_uia,
        ) = await self.e2e_keys_handler.check_cross_signing_setup(user_id)

-        # Before MSC3967 we required UIA both when setting up cross signing for the
-        # first time and when resetting the device signing key. With MSC3967 we only
-        # require UIA when resetting cross-signing, and not when setting up the first
-        # time. Because there is no UIA in MSC3861, for now we throw an error if the
-        # user tries to reset the device signing key when MSC3861 is enabled, but allow
-        # first-time setup.
-        if self.hs.config.experimental.msc3861.enabled:
-            # The auth service has to explicitly mark the master key as replaceable
-            # without UIA to reset the device signing key with MSC3861.
-            if is_cross_signing_setup and not master_key_updatable_without_uia:
-                config = self.hs.config.experimental.msc3861
-                if config.account_management_url is not None:
-                    url = f"{config.account_management_url}?action=org.matrix.cross_signing_reset"
-                else:
-                    url = config.issuer
+        # Resending exactly the same keys should just 200 OK without doing a UIA prompt.
+        keys_are_different = await self.e2e_keys_handler.has_different_keys(
+            user_id, body
+        )
+        if not keys_are_different:
+            return 200, {}

-                raise SynapseError(
-                    HTTPStatus.NOT_IMPLEMENTED,
-                    "To reset your end-to-end encryption cross-signing identity, "
-                    f"you first need to approve it at {url} and then try again.",
-                    Codes.UNRECOGNIZED,
-                )
-            # But first-time setup is fine
+        # The keys are different; is x-signing set up? If no, then this is first-time
+        # setup, and that is allowed without UIA, per MSC3967.
+        # If yes, then we need to authenticate the change.
+        if is_cross_signing_setup:
+            # With MSC3861, UIA is not possible. Instead, the auth service has to
+            # explicitly mark the master key as replaceable.
+            if self.hs.config.experimental.msc3861.enabled:
+                if not master_key_updatable_without_uia:
+                    config = self.hs.config.experimental.msc3861
+                    if config.account_management_url is not None:
+                        url = f"{config.account_management_url}?action=org.matrix.cross_signing_reset"
+                    else:
+                        url = config.issuer

-        elif self.hs.config.experimental.msc3967_enabled:
-            # MSC3967 allows this endpoint to 200 OK for idempotency. Resending exactly the same
-            # keys should just 200 OK without doing a UIA prompt.
-            keys_are_different = await self.e2e_keys_handler.has_different_keys(
-                user_id, body
-            )
-            if not keys_are_different:
-                # FIXME: we do not fallthrough to upload_signing_keys_for_user because confusingly
-                # if we do, we 500 as it looks like it tries to INSERT the same key twice, causing a
-                # unique key constraint violation. This sounds like a bug?
-                return 200, {}
-            # the keys are different, is x-signing set up? If no, then the keys don't exist which is
-            # why they are different. If yes, then we need to UIA to change them.
-            if is_cross_signing_setup:
+                    raise SynapseError(
+                        HTTPStatus.NOT_IMPLEMENTED,
+                        "To reset your end-to-end encryption cross-signing identity, "
+                        f"you first need to approve it at {url} and then try again.",
+                        Codes.UNRECOGNIZED,
+                    )
+            else:
+                # Without MSC3861, we require UIA.
                await self.auth_handler.validate_user_via_ui_auth(
                    requester,
                    request,
@@ -433,18 +419,6 @@ class SigningKeyUploadServlet(RestServlet):
                    # Do not allow skipping of UIA auth.
                    can_skip_ui_auth=False,
                )
-            # Otherwise we don't require UIA since we are setting up cross signing for first time
-        else:
-            # Previous behaviour is to always require UIA but allow it to be skipped
-            await self.auth_handler.validate_user_via_ui_auth(
-                requester,
-                request,
-                body,
-                "add a device signing key to your account",
-                # Allow skipping of UI auth since this is frequently called directly
-                # after login and it is silly to ask users to re-auth immediately.
-                can_skip_ui_auth=True,
-            )

        result = await self.e2e_keys_handler.upload_signing_keys_for_user(user_id, body)
        return 200, result
@@ -53,6 +53,7 @@ class KnockRoomAliasServlet(RestServlet):
        super().__init__()
        self.room_member_handler = hs.get_room_member_handler()
        self.auth = hs.get_auth()
+        self._support_via = hs.config.experimental.msc4156_enabled

    async def on_POST(
        self,
@@ -74,6 +75,13 @@ class KnockRoomAliasServlet(RestServlet):
            remote_room_hosts = parse_strings_from_args(
                args, "server_name", required=False
            )
+            if self._support_via:
+                remote_room_hosts = parse_strings_from_args(
+                    args,
+                    "org.matrix.msc4156.via",
+                    default=remote_room_hosts,
+                    required=False,
+                )
        elif RoomAlias.is_valid(room_identifier):
            handler = self.room_member_handler
            room_alias = RoomAlias.from_string(room_identifier)
@@ -174,6 +174,7 @@ class UnstableThumbnailResource(RestServlet):
                respond_404(request)
                return

+            ip_address = request.getClientAddress().host
            remote_resp_function = (
                self.thumbnailer.select_or_generate_remote_thumbnail
                if self.dynamic_thumbnails
@@ -188,6 +189,7 @@ class UnstableThumbnailResource(RestServlet):
                method,
                m_type,
                max_timeout_ms,
+                ip_address,
            )
            self.media_repo.mark_recently_accessed(server_name, media_id)

@@ -1,99 +0,0 @@
-#
-# This file is licensed under the Affero General Public License (AGPL) version 3.
-#
-# Copyright 2022 The Matrix.org Foundation C.I.C.
-# Copyright (C) 2023 New Vector, Ltd
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as
-# published by the Free Software Foundation, either version 3 of the
-# License, or (at your option) any later version.
-#
-# See the GNU Affero General Public License for more details:
-# <https://www.gnu.org/licenses/agpl-3.0.html>.
-#
-# Originally licensed under the Apache License, Version 2.0:
-# <http://www.apache.org/licenses/LICENSE-2.0>.
-#
-# [This file includes modifications made by New Vector Limited]
-#
-#
-from typing import TYPE_CHECKING, Dict, Optional
-
-from synapse._pydantic_compat import HAS_PYDANTIC_V2
-
-if TYPE_CHECKING or HAS_PYDANTIC_V2:
-    from pydantic.v1 import Extra, StrictInt, StrictStr, constr, validator
-else:
-    from pydantic import Extra, StrictInt, StrictStr, constr, validator
-
-from synapse.rest.models import RequestBodyModel
-from synapse.util.threepids import validate_email
-
-
-class AuthenticationData(RequestBodyModel):
-    """
-    Data used during user-interactive authentication.
-
-    (The name "Authentication Data" is taken directly from the spec.)
-
-    Additional keys will be present, depending on the `type` field. Use
-    `.dict(exclude_unset=True)` to access them.
-    """
-
-    class Config:
-        extra = Extra.allow
-
-    session: Optional[StrictStr] = None
-    type: Optional[StrictStr] = None
-
-
-if TYPE_CHECKING:
-    ClientSecretStr = StrictStr
-else:
-    # See also assert_valid_client_secret()
-    ClientSecretStr = constr(
-        regex="[0-9a-zA-Z.=_-]",  # noqa: F722
-        min_length=1,
-        max_length=255,
-        strict=True,
-    )
-
-
-class ThreepidRequestTokenBody(RequestBodyModel):
-    client_secret: ClientSecretStr
-    id_server: Optional[StrictStr]
-    id_access_token: Optional[StrictStr]
-    next_link: Optional[StrictStr]
-    send_attempt: StrictInt
-
-    @validator("id_access_token", always=True)
-    def token_required_for_identity_server(
-        cls, token: Optional[str], values: Dict[str, object]
-    ) -> Optional[str]:
-        if values.get("id_server") is not None and token is None:
-            raise ValueError("id_access_token is required if an id_server is supplied.")
-        return token
-
-
-class EmailRequestTokenBody(ThreepidRequestTokenBody):
-    email: StrictStr
-
-    # Canonicalise the email address. The addresses are all stored canonicalised
-    # in the database. This allows the user to reset his password without having to
-    # know the exact spelling (eg. upper and lower case) of address in the database.
-    # Without this, an email stored in the database as "foo@bar.com" would cause
-    # user requests for "FOO@bar.com" to raise a Not Found error.
-    _email_validator = validator("email", allow_reuse=True)(validate_email)
-
-
-if TYPE_CHECKING:
-    ISO3116_1_Alpha_2 = StrictStr
-else:
-    # Per spec: two-letter uppercase ISO-3166-1-alpha-2
-    ISO3116_1_Alpha_2 = constr(regex="[A-Z]{2}", strict=True)
-
-
-class MsisdnRequestTokenBody(ThreepidRequestTokenBody):
-    country: ISO3116_1_Alpha_2
-    phone_number: StrictStr
@@ -32,6 +32,7 @@ from synapse.http.servlet import RestServlet, parse_integer, parse_string
 from synapse.http.site import SynapseRequest
 from synapse.types import JsonDict

+from ...api.errors import SynapseError
 from ._base import client_patterns

 if TYPE_CHECKING:
@@ -56,7 +57,22 @@ class NotificationsServlet(RestServlet):
        requester = await self.auth.get_user_by_req(request)
        user_id = requester.user.to_string()

-        from_token = parse_string(request, "from", required=False)
+        # While this is intended to be "string" to clients, the 'from' token
+        # is actually based on a numeric ID. So it must parse to an int.
+        from_token_str = parse_string(request, "from", required=False)
+        if from_token_str is not None:
+            # Parse to an integer.
+            try:
+                from_token = int(from_token_str)
+            except ValueError:
+                # If it doesn't parse to an integer, then this cannot possibly be a valid
+                # pagination token, as we only hand out integers.
+                raise SynapseError(
+                    400, 'Query parameter "from" contains unrecognised token'
+                )
+        else:
+            from_token = None
+
        limit = parse_integer(request, "limit", default=50)
        only = parse_string(request, "only", required=False)

@@ -23,17 +23,28 @@ import logging
 from http import HTTPStatus
 from typing import TYPE_CHECKING, Tuple

+from synapse._pydantic_compat import HAS_PYDANTIC_V2
 from synapse.api.errors import AuthError, Codes, NotFoundError, SynapseError
 from synapse.http.server import HttpServer
-from synapse.http.servlet import RestServlet, parse_json_object_from_request
+from synapse.http.servlet import (
+    RestServlet,
+    parse_and_validate_json_object_from_request,
+    parse_json_object_from_request,
+)
 from synapse.http.site import SynapseRequest
 from synapse.types import JsonDict
+from synapse.types.rest import RequestBodyModel

 from ._base import client_patterns

 if TYPE_CHECKING:
    from synapse.server import HomeServer

+if TYPE_CHECKING or HAS_PYDANTIC_V2:
+    from pydantic.v1 import StrictStr
+else:
+    from pydantic import StrictStr
+
 logger = logging.getLogger(__name__)


@@ -95,5 +106,57 @@ class ReportEventRestServlet(RestServlet):
        return 200, {}


+class ReportRoomRestServlet(RestServlet):
+    """This endpoint lets clients report a room for abuse.
+
+    Whilst MSC4151 is not yet merged, this unstable endpoint is enabled on matrix.org
+    for content moderation purposes, and therefore backwards compatibility should be
+    carefully considered when changing anything on this endpoint.
+
+    More details on the MSC: https://github.com/matrix-org/matrix-spec-proposals/pull/4151
+    """
+
+    PATTERNS = client_patterns(
+        "/org.matrix.msc4151/rooms/(?P<room_id>[^/]*)/report$",
+        releases=[],
+        v1=False,
+        unstable=True,
+    )
+
+    def __init__(self, hs: "HomeServer"):
+        super().__init__()
+        self.hs = hs
+        self.auth = hs.get_auth()
+        self.clock = hs.get_clock()
+        self.store = hs.get_datastores().main
+
+    class PostBody(RequestBodyModel):
+        reason: StrictStr
+
+    async def on_POST(
+        self, request: SynapseRequest, room_id: str
+    ) -> Tuple[int, JsonDict]:
+        requester = await self.auth.get_user_by_req(request)
+        user_id = requester.user.to_string()
+
+        body = parse_and_validate_json_object_from_request(request, self.PostBody)
+
+        room = await self.store.get_room(room_id)
+        if room is None:
+            raise NotFoundError("Room does not exist")
+
+        await self.store.add_room_report(
+            room_id=room_id,
+            user_id=user_id,
+            reason=body.reason,
+            received_ts=self.clock.time_msec(),
+        )
+
+        return 200, {}
+
+
 def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
    ReportEventRestServlet(hs).register(http_server)
+
+    if hs.config.experimental.msc4151_enabled:
+        ReportRoomRestServlet(hs).register(http_server)
@@ -292,6 +292,9 @@ class RoomStateEventRestServlet(RestServlet):
        try:
            if event_type == EventTypes.Member:
                membership = content.get("membership", None)
+                if not isinstance(membership, str):
+                    raise SynapseError(400, "Invalid membership (must be a string)")
+
                event_id, _ = await self.room_member_handler.update_membership(
                    requester,
                    target=UserID.from_string(state_key),
@@ -414,6 +417,7 @@ class JoinRoomAliasServlet(ResolveRoomIdMixin, TransactionRestServlet):
        super().__init__(hs)
        super(ResolveRoomIdMixin, self).__init__(hs)  # ensure the Mixin is set up
        self.auth = hs.get_auth()
+        self._support_via = hs.config.experimental.msc4156_enabled

    def register(self, http_server: HttpServer) -> None:
        # /join/$room_identifier[/$txn_id]
@@ -432,6 +436,13 @@ class JoinRoomAliasServlet(ResolveRoomIdMixin, TransactionRestServlet):
        # twisted.web.server.Request.args is incorrectly defined as Optional[Any]
        args: Dict[bytes, List[bytes]] = request.args  # type: ignore
        remote_room_hosts = parse_strings_from_args(args, "server_name", required=False)
+        if self._support_via:
+            remote_room_hosts = parse_strings_from_args(
+                args,
+                "org.matrix.msc4156.via",
+                default=remote_room_hosts,
+                required=False,
+            )
        room_id, remote_room_hosts = await self.resolve_room_id(
            room_identifier,
            remote_room_hosts,
@@ -33,6 +33,7 @@ from synapse.events.utils import (
    format_event_raw,
 )
 from synapse.handlers.presence import format_user_presence_state
+from synapse.handlers.sliding_sync import SlidingSyncConfig, SlidingSyncResult
 from synapse.handlers.sync import (
    ArchivedSyncResult,
    InvitedSyncResult,
@@ -43,10 +44,17 @@ from synapse.handlers.sync import (
    SyncVersion,
 )
 from synapse.http.server import HttpServer
-from synapse.http.servlet import RestServlet, parse_boolean, parse_integer, parse_string
+from synapse.http.servlet import (
+    RestServlet,
+    parse_and_validate_json_object_from_request,
+    parse_boolean,
+    parse_integer,
+    parse_string,
+)
 from synapse.http.site import SynapseRequest
 from synapse.logging.opentracing import trace_with_opname
 from synapse.types import JsonDict, Requester, StreamToken
+from synapse.types.rest.client import SlidingSyncBody
 from synapse.util import json_decoder
 from synapse.util.caches.lrucache import LruCache

@@ -735,8 +743,228 @@ class SlidingSyncE2eeRestServlet(RestServlet):
        return 200, response


+class SlidingSyncRestServlet(RestServlet):
+    """
+    API endpoint for MSC3575 Sliding Sync `/sync`. Allows for clients to request a
+    subset (sliding window) of rooms, state, and timeline events (just what they need)
+    in order to bootstrap quickly and subscribe to only what the client cares about.
+    Because the client can specify what it cares about, we can respond quickly and skip
+    all of the work we would normally have to do with a sync v2 response.
+
+    Request query parameters:
+        timeout: How long to wait for new events in milliseconds.
+        pos: Stream position token when asking for incremental deltas.
+
+    Request body::
+        {
+            // Sliding Window API
+            "lists": {
+                "foo-list": {
+                    "ranges": [ [0, 99] ],
+                    "sort": [ "by_notification_level", "by_recency", "by_name" ],
+                    "required_state": [
+                        ["m.room.join_rules", ""],
+                        ["m.room.history_visibility", ""],
+                        ["m.space.child", "*"]
+                    ],
+                    "timeline_limit": 10,
+                    "filters": {
+                        "is_dm": true
+                    },
+                    "bump_event_types": [ "m.room.message", "m.room.encrypted" ],
+                }
+            },
+            // Room Subscriptions API
+            "room_subscriptions": {
+                "!sub1:bar": {
+                    "required_state": [ ["*","*"] ],
+                    "timeline_limit": 10,
+                    "include_old_rooms": {
+                        "timeline_limit": 1,
+                        "required_state": [ ["m.room.tombstone", ""], ["m.room.create", ""] ],
+                    }
+                }
+            },
+            // Extensions API
+            "extensions": {}
+        }
+
+    Response JSON::
+        {
+            "next_pos": "s58_224_0_13_10_1_1_16_0_1",
+            "lists": {
+                "foo-list": {
+                    "count": 1337,
+                    "ops": [{
+                        "op": "SYNC",
+                        "range": [0, 99],
+                        "room_ids": [
+                            "!foo:bar",
+                            // ... 99 more room IDs
+                        ]
+                    }]
+                }
+            },
+            // Aggregated rooms from lists and room subscriptions
+            "rooms": {
+                // Room from room subscription
+                "!sub1:bar": {
+                    "name": "Alice and Bob",
+                    "avatar": "mxc://...",
+                    "initial": true,
+                    "required_state": [
+                        {"sender":"@alice:example.com","type":"m.room.create", "state_key":"", "content":{"creator":"@alice:example.com"}},
+                        {"sender":"@alice:example.com","type":"m.room.join_rules", "state_key":"", "content":{"join_rule":"invite"}},
+                        {"sender":"@alice:example.com","type":"m.room.history_visibility", "state_key":"", "content":{"history_visibility":"joined"}},
+                        {"sender":"@alice:example.com","type":"m.room.member", "state_key":"@alice:example.com", "content":{"membership":"join"}}
+                    ],
+                    "timeline": [
+                        {"sender":"@alice:example.com","type":"m.room.create", "state_key":"", "content":{"creator":"@alice:example.com"}},
+                        {"sender":"@alice:example.com","type":"m.room.join_rules", "state_key":"", "content":{"join_rule":"invite"}},
+                        {"sender":"@alice:example.com","type":"m.room.history_visibility", "state_key":"", "content":{"history_visibility":"joined"}},
+                        {"sender":"@alice:example.com","type":"m.room.member", "state_key":"@alice:example.com", "content":{"membership":"join"}},
+                        {"sender":"@alice:example.com","type":"m.room.message", "content":{"body":"A"}},
+                        {"sender":"@alice:example.com","type":"m.room.message", "content":{"body":"B"}},
+                    ],
+                    "prev_batch": "t111_222_333",
+                    "joined_count": 41,
+                    "invited_count": 1,
+                    "notification_count": 1,
+                    "highlight_count": 0
+                },
+                // rooms from list
+                "!foo:bar": {
+                    "name": "The calculated room name",
+                    "avatar": "mxc://...",
+                    "initial": true,
+                    "required_state": [
+                        {"sender":"@alice:example.com","type":"m.room.join_rules", "state_key":"", "content":{"join_rule":"invite"}},
+                        {"sender":"@alice:example.com","type":"m.room.history_visibility", "state_key":"", "content":{"history_visibility":"joined"}},
+                        {"sender":"@alice:example.com","type":"m.space.child", "state_key":"!foo:example.com", "content":{"via":["example.com"]}},
+                        {"sender":"@alice:example.com","type":"m.space.child", "state_key":"!bar:example.com", "content":{"via":["example.com"]}},
+                        {"sender":"@alice:example.com","type":"m.space.child", "state_key":"!baz:example.com", "content":{"via":["example.com"]}}
+                    ],
+                    "timeline": [
+                        {"sender":"@alice:example.com","type":"m.room.join_rules", "state_key":"", "content":{"join_rule":"invite"}},
+                        {"sender":"@alice:example.com","type":"m.room.message", "content":{"body":"A"}},
+                        {"sender":"@alice:example.com","type":"m.room.message", "content":{"body":"B"}},
+                        {"sender":"@alice:example.com","type":"m.room.message", "content":{"body":"C"}},
+                        {"sender":"@alice:example.com","type":"m.room.message", "content":{"body":"D"}},
+                    ],
+                    "prev_batch": "t111_222_333",
+                    "joined_count": 4,
+                    "invited_count": 0,
+                    "notification_count": 54,
+                    "highlight_count": 3
+                },
+                 // ... 99 more items
+            },
+            "extensions": {}
+        }
+    """
+
+    PATTERNS = client_patterns(
+        "/org.matrix.msc3575/sync$", releases=[], v1=False, unstable=True
+    )
+
+    def __init__(self, hs: "HomeServer"):
+        super().__init__()
+        self.auth = hs.get_auth()
+        self.store = hs.get_datastores().main
+        self.filtering = hs.get_filtering()
+        self.sliding_sync_handler = hs.get_sliding_sync_handler()
+
+    # TODO: Update this to `on_GET` once we figure out how we want to handle params
+    async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
+        requester = await self.auth.get_user_by_req(request, allow_guest=True)
+        user = requester.user
+        device_id = requester.device_id
+
+        timeout = parse_integer(request, "timeout", default=0)
+        # Position in the stream
+        from_token_string = parse_string(request, "pos")
+
+        from_token = None
+        if from_token_string is not None:
+            from_token = await StreamToken.from_string(self.store, from_token_string)
+
+        # TODO: We currently don't know whether we're going to use sticky params or
+        # maybe some filters like sync v2  where they are built up once and referenced
+        # by filter ID. For now, we will just prototype with always passing everything
+        # in.
+        body = parse_and_validate_json_object_from_request(request, SlidingSyncBody)
+        logger.info("Sliding sync request: %r", body)
+
+        sync_config = SlidingSyncConfig(
+            user=user,
+            device_id=device_id,
+            # FIXME: Currently, we're just manually copying the fields from the
+            # `SlidingSyncBody` into the config. How can we gurantee into the future
+            # that we don't forget any? I would like something more structured like
+            # `copy_attributes(from=body, to=config)`
+            lists=body.lists,
+            room_subscriptions=body.room_subscriptions,
+            extensions=body.extensions,
+        )
+
+        sliding_sync_results = await self.sliding_sync_handler.wait_for_sync_for_user(
+            requester,
+            sync_config,
+            from_token,
+            timeout,
+        )
+
+        # The client may have disconnected by now; don't bother to serialize the
+        # response if so.
+        if request._disconnected:
+            logger.info("Client has disconnected; not serializing response.")
+            return 200, {}
+
+        response_content = await self.encode_response(sliding_sync_results)
+
+        return 200, response_content
+
+    # TODO: Is there a better way to encode things?
+    async def encode_response(
+        self,
+        sliding_sync_result: SlidingSyncResult,
+    ) -> JsonDict:
+        response: JsonDict = defaultdict(dict)
+
+        response["next_pos"] = await sliding_sync_result.next_pos.to_string(self.store)
+        serialized_lists = self.encode_lists(sliding_sync_result.lists)
+        if serialized_lists:
+            response["lists"] = serialized_lists
+        response["rooms"] = {}  # TODO: sliding_sync_result.rooms
+        response["extensions"] = {}  # TODO: sliding_sync_result.extensions
+
+        return response
+
+    def encode_lists(
+        self, lists: Dict[str, SlidingSyncResult.SlidingWindowList]
+    ) -> JsonDict:
+        def encode_operation(
+            operation: SlidingSyncResult.SlidingWindowList.Operation,
+        ) -> JsonDict:
+            return {
+                "op": operation.op.value,
+                "range": operation.range,
+                "room_ids": operation.room_ids,
+            }
+
+        serialized_lists = {}
+        for list_key, list_result in lists.items():
+            serialized_lists[list_key] = {
+                "count": list_result.count,
+                "ops": [encode_operation(op) for op in list_result.ops],
+            }
+
+        return serialized_lists
+
+
 def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
    SyncRestServlet(hs).register(http_server)

    if hs.config.experimental.msc3575_enabled:
+        SlidingSyncRestServlet(hs).register(http_server)
        SlidingSyncE2eeRestServlet(hs).register(http_server)
@@ -149,6 +149,8 @@ class VersionsRestServlet(RestServlet):
                            is not None
                        )
                    ),
+                    # MSC4151: Report room API (Client-Server API)
+                    "org.matrix.msc4151": self.config.experimental.msc4151_enabled,
                },
            },
        )
@@ -41,9 +41,9 @@ from synapse.http.servlet import (
    parse_and_validate_json_object_from_request,
    parse_integer,
 )
-from synapse.rest.models import RequestBodyModel
 from synapse.storage.keys import FetchKeyResultForRemote
 from synapse.types import JsonDict
+from synapse.types.rest import RequestBodyModel
 from synapse.util import json_decoder
 from synapse.util.async_helpers import yieldable_gather_results

@@ -97,6 +97,12 @@ class DownloadResource(RestServlet):
                respond_404(request)
                return

+            ip_address = request.getClientAddress().host
            await self.media_repo.get_remote_media(
-                request, server_name, media_id, file_name, max_timeout_ms
+                request,
+                server_name,
+                media_id,
+                file_name,
+                max_timeout_ms,
+                ip_address,
            )
@@ -104,6 +104,7 @@ class ThumbnailResource(RestServlet):
                respond_404(request)
                return

+            ip_address = request.getClientAddress().host
            remote_resp_function = (
                self.thumbnail_provider.select_or_generate_remote_thumbnail
                if self.dynamic_thumbnails
@@ -118,5 +119,6 @@ class ThumbnailResource(RestServlet):
                method,
                m_type,
                max_timeout_ms,
+                ip_address,
            )
            self.media_repo.mark_recently_accessed(server_name, media_id)
@@ -109,6 +109,7 @@ from synapse.handlers.room_summary import RoomSummaryHandler
 from synapse.handlers.search import SearchHandler
 from synapse.handlers.send_email import SendEmailHandler
 from synapse.handlers.set_password import SetPasswordHandler
+from synapse.handlers.sliding_sync import SlidingSyncHandler
 from synapse.handlers.sso import SsoHandler
 from synapse.handlers.stats import StatsHandler
 from synapse.handlers.sync import SyncHandler
@@ -554,6 +555,9 @@ class HomeServer(metaclass=abc.ABCMeta):
    def get_sync_handler(self) -> SyncHandler:
        return SyncHandler(self)

+    def get_sliding_sync_handler(self) -> SlidingSyncHandler:
+        return SlidingSyncHandler(self)
+
    @cache_in_self
    def get_room_list_handler(self) -> RoomListHandler:
        return RoomListHandler(self)
@@ -617,6 +617,17 @@ class EventsPersistenceStorageController:
                        room_id, chunk
                    )

+            with Measure(self._clock, "calculate_chain_cover_index_for_events"):
+                # We now calculate chain ID/sequence numbers for any state events we're
+                # persisting. We ignore out of band memberships as we're not in the room
+                # and won't have their auth chain (we'll fix it up later if we join the
+                # room).
+                #
+                # See: docs/auth_chain_difference_algorithm.md
+                new_event_links = await self.persist_events_store.calculate_chain_cover_index_for_events(
+                    room_id, [e for e, _ in chunk]
+                )
+
            await self.persist_events_store._persist_events_and_state_updates(
                room_id,
                chunk,
@@ -624,6 +635,7 @@ class EventsPersistenceStorageController:
                new_forward_extremities=new_forward_extremities,
                use_negative_stream_ordering=backfilled,
                inhibit_local_membership_updates=backfilled,
+                new_event_links=new_event_links,
            )

        return replaced_events
@@ -45,7 +45,7 @@ from synapse.storage.util.partial_state_events_tracker import (
    PartialStateEventsTracker,
 )
 from synapse.synapse_rust.acl import ServerAclEvaluator
-from synapse.types import MutableStateMap, StateMap, get_domain_from_id
+from synapse.types import MutableStateMap, StateMap, StreamToken, get_domain_from_id
 from synapse.types.state import StateFilter
 from synapse.util.async_helpers import Linearizer
 from synapse.util.caches import intern_string
@@ -372,6 +372,91 @@ class StateStorageController:
        )
        return state_map[event_id]

+    async def get_state_after_event(
+        self,
+        event_id: str,
+        state_filter: Optional[StateFilter] = None,
+        await_full_state: bool = True,
+    ) -> StateMap[str]:
+        """
+        Get the room state after the given event
+
+        Args:
+            event_id: event of interest
+            state_filter: The state filter used to fetch state from the database.
+            await_full_state: if `True`, will block if we do not yet have complete state
+                at the event and `state_filter` is not satisfied by partial state.
+                Defaults to `True`.
+        """
+        state_ids = await self.get_state_ids_for_event(
+            event_id,
+            state_filter=state_filter or StateFilter.all(),
+            await_full_state=await_full_state,
+        )
+
+        # using get_metadata_for_events here (instead of get_event) sidesteps an issue
+        # with redactions: if `event_id` is a redaction event, and we don't have the
+        # original (possibly because it got purged), get_event will refuse to return
+        # the redaction event, which isn't terribly helpful here.
+        #
+        # (To be fair, in that case we could assume it's *not* a state event, and
+        # therefore we don't need to worry about it. But still, it seems cleaner just
+        # to pull the metadata.)
+        m = (await self.stores.main.get_metadata_for_events([event_id]))[event_id]
+        if m.state_key is not None and m.rejection_reason is None:
+            state_ids = dict(state_ids)
+            state_ids[(m.event_type, m.state_key)] = event_id
+
+        return state_ids
+
+    async def get_state_at(
+        self,
+        room_id: str,
+        stream_position: StreamToken,
+        state_filter: Optional[StateFilter] = None,
+        await_full_state: bool = True,
+    ) -> StateMap[str]:
+        """Get the room state at a particular stream position
+
+        Args:
+            room_id: room for which to get state
+            stream_position: point at which to get state
+            state_filter: The state filter used to fetch state from the database.
+            await_full_state: if `True`, will block if we do not yet have complete state
+                at the last event in the room before `stream_position` and
+                `state_filter` is not satisfied by partial state. Defaults to `True`.
+        """
+        # FIXME: This gets the state at the latest event before the stream ordering,
+        # which might not be the same as the "current state" of the room at the time
+        # of the stream token if there were multiple forward extremities at the time.
+        last_event_id = (
+            await self.stores.main.get_last_event_id_in_room_before_stream_ordering(
+                room_id,
+                end_token=stream_position.room_key,
+            )
+        )
+
+        if last_event_id:
+            state = await self.get_state_after_event(
+                last_event_id,
+                state_filter=state_filter or StateFilter.all(),
+                await_full_state=await_full_state,
+            )
+
+        else:
+            # no events in this room - so presumably no state
+            state = {}
+
+            # (erikj) This should be rarely hit, but we've had some reports that
+            # we get more state down gappy syncs than we should, so let's add
+            # some logging.
+            logger.info(
+                "Failed to find any events in room %s at %s",
+                room_id,
+                stream_position.room_key,
+            )
+        return state
+
    @trace
    @tag_args
    async def get_state_for_groups(
@@ -1829,7 +1829,7 @@ class EventPushActionsWorkerStore(ReceiptsWorkerStore, StreamWorkerStore, SQLBas
    async def get_push_actions_for_user(
        self,
        user_id: str,
-        before: Optional[str] = None,
+        before: Optional[int] = None,
        limit: int = 50,
        only_highlight: bool = False,
    ) -> List[UserPushAction]:
@@ -34,7 +34,6 @@ from typing import (
    Optional,
    Set,
    Tuple,
-    Union,
    cast,
 )

@@ -100,6 +99,23 @@ class DeltaState:
        return not self.to_delete and not self.to_insert and not self.no_longer_in_room


+@attr.s(slots=True, auto_attribs=True)
+class NewEventChainLinks:
+    """Information about new auth chain links that need to be added to the DB.
+
+    Attributes:
+        chain_id, sequence_number: the IDs corresponding to the event being
+            inserted, and the starting point of the links
+        links: Lists the links that need to be added, 2-tuple of the chain
+            ID/sequence number of the end point of the link.
+    """
+
+    chain_id: int
+    sequence_number: int
+
+    links: List[Tuple[int, int]] = attr.Factory(list)
+
+
 class PersistEventsStore:
    """Contains all the functions for writing events to the database.

@@ -148,6 +164,7 @@ class PersistEventsStore:
        *,
        state_delta_for_room: Optional[DeltaState],
        new_forward_extremities: Optional[Set[str]],
+        new_event_links: Dict[str, NewEventChainLinks],
        use_negative_stream_ordering: bool = False,
        inhibit_local_membership_updates: bool = False,
    ) -> None:
@@ -207,6 +224,7 @@ class PersistEventsStore:
        async with stream_ordering_manager as stream_orderings:
            for (event, _), stream in zip(events_and_contexts, stream_orderings):
                event.internal_metadata.stream_ordering = stream
+                event.internal_metadata.instance_name = self._instance_name

            await self.db_pool.runInteraction(
                "persist_events",
@@ -216,6 +234,7 @@ class PersistEventsStore:
                inhibit_local_membership_updates=inhibit_local_membership_updates,
                state_delta_for_room=state_delta_for_room,
                new_forward_extremities=new_forward_extremities,
+                new_event_links=new_event_links,
            )
            persist_event_counter.inc(len(events_and_contexts))

@@ -242,6 +261,87 @@ class PersistEventsStore:
                    (room_id,), frozenset(new_forward_extremities)
                )

+    async def calculate_chain_cover_index_for_events(
+        self, room_id: str, events: Collection[EventBase]
+    ) -> Dict[str, NewEventChainLinks]:
+        # Filter to state events, and ensure there are no duplicates.
+        state_events = []
+        seen_events = set()
+        for event in events:
+            if not event.is_state() or event.event_id in seen_events:
+                continue
+
+            state_events.append(event)
+            seen_events.add(event.event_id)
+
+        if not state_events:
+            return {}
+
+        return await self.db_pool.runInteraction(
+            "_calculate_chain_cover_index_for_events",
+            self.calculate_chain_cover_index_for_events_txn,
+            room_id,
+            state_events,
+        )
+
+    def calculate_chain_cover_index_for_events_txn(
+        self, txn: LoggingTransaction, room_id: str, state_events: Collection[EventBase]
+    ) -> Dict[str, NewEventChainLinks]:
+        # We now calculate chain ID/sequence numbers for any state events we're
+        # persisting. We ignore out of band memberships as we're not in the room
+        # and won't have their auth chain (we'll fix it up later if we join the
+        # room).
+        #
+        # See: docs/auth_chain_difference_algorithm.md
+
+        # We ignore legacy rooms that we aren't filling the chain cover index
+        # for.
+        row = self.db_pool.simple_select_one_txn(
+            txn,
+            table="rooms",
+            keyvalues={"room_id": room_id},
+            retcols=("room_id", "has_auth_chain_index"),
+            allow_none=True,
+        )
+        if row is None:
+            return {}
+
+        # Filter out already persisted events.
+        rows = self.db_pool.simple_select_many_txn(
+            txn,
+            table="events",
+            column="event_id",
+            iterable=[e.event_id for e in state_events],
+            keyvalues={},
+            retcols=("event_id",),
+        )
+        already_persisted_events = {event_id for event_id, in rows}
+        state_events = [
+            event
+            for event in state_events
+            if event.event_id in already_persisted_events
+        ]
+
+        if not state_events:
+            return {}
+
+        # We need to know the type/state_key and auth events of the events we're
+        # calculating chain IDs for. We don't rely on having the full Event
+        # instances as we'll potentially be pulling more events from the DB and
+        # we don't need the overhead of fetching/parsing the full event JSON.
+        event_to_types = {e.event_id: (e.type, e.state_key) for e in state_events}
+        event_to_auth_chain = {e.event_id: e.auth_event_ids() for e in state_events}
+        event_to_room_id = {e.event_id: e.room_id for e in state_events}
+
+        return self._calculate_chain_cover_index(
+            txn,
+            self.db_pool,
+            self.store.event_chain_id_gen,
+            event_to_room_id,
+            event_to_types,
+            event_to_auth_chain,
+        )
+
    async def _get_events_which_are_prevs(self, event_ids: Iterable[str]) -> List[str]:
        """Filter the supplied list of event_ids to get those which are prev_events of
        existing (non-outlier/rejected) events.
@@ -357,6 +457,7 @@ class PersistEventsStore:
        inhibit_local_membership_updates: bool,
        state_delta_for_room: Optional[DeltaState],
        new_forward_extremities: Optional[Set[str]],
+        new_event_links: Dict[str, NewEventChainLinks],
    ) -> None:
        """Insert some number of room events into the necessary database tables.

@@ -465,7 +566,9 @@ class PersistEventsStore:
        # Insert into event_to_state_groups.
        self._store_event_state_mappings_txn(txn, events_and_contexts)

-        self._persist_event_auth_chain_txn(txn, [e for e, _ in events_and_contexts])
+        self._persist_event_auth_chain_txn(
+            txn, [e for e, _ in events_and_contexts], new_event_links
+        )

        # _store_rejected_events_txn filters out any events which were
        # rejected, and returns the filtered list.
@@ -495,6 +598,7 @@ class PersistEventsStore:
        self,
        txn: LoggingTransaction,
        events: List[EventBase],
+        new_event_links: Dict[str, NewEventChainLinks],
    ) -> None:
        # We only care about state events, so this if there are no state events.
        if not any(e.is_state() for e in events):
@@ -518,59 +622,8 @@ class PersistEventsStore:
            ],
        )

-        # We now calculate chain ID/sequence numbers for any state events we're
-        # persisting. We ignore out of band memberships as we're not in the room
-        # and won't have their auth chain (we'll fix it up later if we join the
-        # room).
-        #
-        # See: docs/auth_chain_difference_algorithm.md
-
-        # We ignore legacy rooms that we aren't filling the chain cover index
-        # for.
-        rows = cast(
-            List[Tuple[str, Optional[Union[int, bool]]]],
-            self.db_pool.simple_select_many_txn(
-                txn,
-                table="rooms",
-                column="room_id",
-                iterable={event.room_id for event in events if event.is_state()},
-                keyvalues={},
-                retcols=("room_id", "has_auth_chain_index"),
-            ),
-        )
-        rooms_using_chain_index = {
-            room_id for room_id, has_auth_chain_index in rows if has_auth_chain_index
-        }
-
-        state_events = {
-            event.event_id: event
-            for event in events
-            if event.is_state() and event.room_id in rooms_using_chain_index
-        }
-
-        if not state_events:
-            return
-
-        # We need to know the type/state_key and auth events of the events we're
-        # calculating chain IDs for. We don't rely on having the full Event
-        # instances as we'll potentially be pulling more events from the DB and
-        # we don't need the overhead of fetching/parsing the full event JSON.
-        event_to_types = {
-            e.event_id: (e.type, e.state_key) for e in state_events.values()
-        }
-        event_to_auth_chain = {
-            e.event_id: e.auth_event_ids() for e in state_events.values()
-        }
-        event_to_room_id = {e.event_id: e.room_id for e in state_events.values()}
-
-        self._add_chain_cover_index(
-            txn,
-            self.db_pool,
-            self.store.event_chain_id_gen,
-            event_to_room_id,
-            event_to_types,
-            event_to_auth_chain,
-        )
+        if new_event_links:
+            self._persist_chain_cover_index(txn, self.db_pool, new_event_links)

    @classmethod
    def _add_chain_cover_index(
@@ -582,6 +635,35 @@ class PersistEventsStore:
        event_to_types: Dict[str, Tuple[str, str]],
        event_to_auth_chain: Dict[str, StrCollection],
    ) -> None:
+        """Calculate and persist the chain cover index for the given events.
+
+        Args:
+            event_to_room_id: Event ID to the room ID of the event
+            event_to_types: Event ID to type and state_key of the event
+            event_to_auth_chain: Event ID to list of auth event IDs of the
+                event (events with no auth events can be excluded).
+        """
+
+        new_event_links = cls._calculate_chain_cover_index(
+            txn,
+            db_pool,
+            event_chain_id_gen,
+            event_to_room_id,
+            event_to_types,
+            event_to_auth_chain,
+        )
+        cls._persist_chain_cover_index(txn, db_pool, new_event_links)
+
+    @classmethod
+    def _calculate_chain_cover_index(
+        cls,
+        txn: LoggingTransaction,
+        db_pool: DatabasePool,
+        event_chain_id_gen: SequenceGenerator,
+        event_to_room_id: Dict[str, str],
+        event_to_types: Dict[str, Tuple[str, str]],
+        event_to_auth_chain: Dict[str, StrCollection],
+    ) -> Dict[str, NewEventChainLinks]:
        """Calculate the chain cover index for the given events.

        Args:
@@ -589,6 +671,10 @@ class PersistEventsStore:
            event_to_types: Event ID to type and state_key of the event
            event_to_auth_chain: Event ID to list of auth event IDs of the
                event (events with no auth events can be excluded).
+
+        Returns:
+            A mapping with any new auth chain links we need to add, keyed by
+            event ID.
        """

        # Map from event ID to chain ID/sequence number.
@@ -707,11 +793,11 @@ class PersistEventsStore:
                    room_id = event_to_room_id.get(event_id)
                    if room_id:
                        e_type, state_key = event_to_types[event_id]
-                        db_pool.simple_insert_txn(
+                        db_pool.simple_upsert_txn(
                            txn,
                            table="event_auth_chain_to_calculate",
+                            keyvalues={"event_id": event_id},
                            values={
-                                "event_id": event_id,
                                "room_id": room_id,
                                "type": e_type,
                                "state_key": state_key,
@@ -723,7 +809,7 @@ class PersistEventsStore:
                    break

        if not events_to_calc_chain_id_for:
-            return
+            return {}

        # Allocate chain ID/sequence numbers to each new event.
        new_chain_tuples = cls._allocate_chain_ids(
@@ -738,23 +824,10 @@ class PersistEventsStore:
        )
        chain_map.update(new_chain_tuples)

-        db_pool.simple_insert_many_txn(
-            txn,
-            table="event_auth_chains",
-            keys=("event_id", "chain_id", "sequence_number"),
-            values=[
-                (event_id, c_id, seq)
-                for event_id, (c_id, seq) in new_chain_tuples.items()
-            ],
-        )
-
-        db_pool.simple_delete_many_txn(
-            txn,
-            table="event_auth_chain_to_calculate",
-            keyvalues={},
-            column="event_id",
-            values=new_chain_tuples,
-        )
+        to_return = {
+            event_id: NewEventChainLinks(chain_id, sequence_number)
+            for event_id, (chain_id, sequence_number) in new_chain_tuples.items()
+        }

        # Now we need to calculate any new links between chains caused by
        # the new events.
@@ -824,10 +897,38 @@ class PersistEventsStore:
                auth_chain_id, auth_sequence_number = chain_map[auth_id]

                # Step 2a, add link between the event and auth event
+                to_return[event_id].links.append((auth_chain_id, auth_sequence_number))
                chain_links.add_link(
                    (chain_id, sequence_number), (auth_chain_id, auth_sequence_number)
                )

+        return to_return
+
+    @classmethod
+    def _persist_chain_cover_index(
+        cls,
+        txn: LoggingTransaction,
+        db_pool: DatabasePool,
+        new_event_links: Dict[str, NewEventChainLinks],
+    ) -> None:
+        db_pool.simple_insert_many_txn(
+            txn,
+            table="event_auth_chains",
+            keys=("event_id", "chain_id", "sequence_number"),
+            values=[
+                (event_id, new_links.chain_id, new_links.sequence_number)
+                for event_id, new_links in new_event_links.items()
+            ],
+        )
+
+        db_pool.simple_delete_many_txn(
+            txn,
+            table="event_auth_chain_to_calculate",
+            keyvalues={},
+            column="event_id",
+            values=new_event_links,
+        )
+
        db_pool.simple_insert_many_txn(
            txn,
            table="event_auth_chain_links",
@@ -837,7 +938,16 @@ class PersistEventsStore:
                "target_chain_id",
                "target_sequence_number",
            ),
-            values=list(chain_links.get_additions()),
+            values=[
+                (
+                    new_links.chain_id,
+                    new_links.sequence_number,
+                    target_chain_id,
+                    target_sequence_number,
+                )
+                for new_links in new_event_links.values()
+                for (target_chain_id, target_sequence_number) in new_links.links
+            ],
        )

    @staticmethod
@@ -156,6 +156,7 @@ class _EventRow:

    event_id: str
    stream_ordering: int
+    instance_name: str
    json: str
    internal_metadata: str
    format_version: Optional[int]
@@ -1354,6 +1355,7 @@ class EventsWorkerStore(SQLBaseStore):
                rejected_reason=rejected_reason,
            )
            original_ev.internal_metadata.stream_ordering = row.stream_ordering
+            original_ev.internal_metadata.instance_name = row.instance_name
            original_ev.internal_metadata.outlier = row.outlier

            # Consistency check: if the content of the event has been modified in the
@@ -1439,6 +1441,7 @@ class EventsWorkerStore(SQLBaseStore):
                SELECT
                  e.event_id,
                  e.stream_ordering,
+                  e.instance_name,
                  ej.internal_metadata,
                  ej.json,
                  ej.format_version,
@@ -1462,13 +1465,14 @@ class EventsWorkerStore(SQLBaseStore):
                event_dict[event_id] = _EventRow(
                    event_id=event_id,
                    stream_ordering=row[1],
-                    internal_metadata=row[2],
-                    json=row[3],
-                    format_version=row[4],
-                    room_version_id=row[5],
-                    rejected_reason=row[6],
+                    instance_name=row[2],
+                    internal_metadata=row[3],
+                    json=row[4],
+                    format_version=row[5],
+                    room_version_id=row[6],
+                    rejected_reason=row[7],
                    redactions=[],
-                    outlier=bool(row[7]),  # This is an int in SQLite3
+                    outlier=bool(row[8]),  # This is an int in SQLite3
                )

            # check for redactions
@@ -2207,6 +2207,7 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore):
        super().__init__(database, db_conn, hs)

        self._event_reports_id_gen = IdGenerator(db_conn, "event_reports", "id")
+        self._room_reports_id_gen = IdGenerator(db_conn, "room_reports", "id")

        self._instance_name = hs.get_instance_name()

@@ -2416,6 +2417,37 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore):
        )
        return next_id

+    async def add_room_report(
+        self,
+        room_id: str,
+        user_id: str,
+        reason: str,
+        received_ts: int,
+    ) -> int:
+        """Add a room report
+
+        Args:
+            room_id: The room ID being reported.
+            user_id: User who reports the room.
+            reason: Description that the user specifies.
+            received_ts: Time when the user submitted the report (milliseconds).
+        Returns:
+            Id of the room report.
+        """
+        next_id = self._room_reports_id_gen.get_next()
+        await self.db_pool.simple_insert(
+            table="room_reports",
+            values={
+                "id": next_id,
+                "received_ts": received_ts,
+                "room_id": room_id,
+                "user_id": user_id,
+                "reason": reason,
+            },
+            desc="add_room_report",
+        )
+        return next_id
+
    async def block_room(self, room_id: str, user_id: str) -> None:
        """Marks the room as blocked.

@@ -476,7 +476,7 @@ class RoomMemberWorkerStore(EventsWorkerStore, CacheInvalidationWorkerStore):
        )

        sql = """
-            SELECT room_id, e.sender, c.membership, event_id, e.stream_ordering, r.room_version
+            SELECT room_id, e.sender, c.membership, event_id, e.instance_name, e.stream_ordering, r.room_version
            FROM local_current_membership AS c
            INNER JOIN events AS e USING (room_id, event_id)
            INNER JOIN rooms AS r USING (room_id)
@@ -488,7 +488,17 @@ class RoomMemberWorkerStore(EventsWorkerStore, CacheInvalidationWorkerStore):
        )

        txn.execute(sql, (user_id, *args))
-        results = [RoomsForUser(*r) for r in txn]
+        results = [
+            RoomsForUser(
+                room_id=room_id,
+                sender=sender,
+                membership=membership,
+                event_id=event_id,
+                event_pos=PersistedEventPosition(instance_name, stream_ordering),
+                room_version_id=room_version,
+            )
+            for room_id, sender, membership, event_id, instance_name, stream_ordering, room_version in txn
+        ]

        return results

@@ -895,7 +895,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
            "get_room_event_before_stream_ordering", _f
        )

-    async def get_last_event_in_room_before_stream_ordering(
+    async def get_last_event_id_in_room_before_stream_ordering(
        self,
        room_id: str,
        end_token: RoomStreamToken,
@@ -910,16 +910,55 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
            The ID of the most recent event, or None if there are no events in the room
            before this stream ordering.
        """
+        last_event_result = (
+            await self.get_last_event_pos_in_room_before_stream_ordering(
+                room_id, end_token
+            )
+        )

-        def get_last_event_in_room_before_stream_ordering_txn(
+        if last_event_result:
+            return last_event_result[0]
+
+        return None
+
+    async def get_last_event_pos_in_room_before_stream_ordering(
+        self,
+        room_id: str,
+        end_token: RoomStreamToken,
+    ) -> Optional[Tuple[str, PersistedEventPosition]]:
+        """
+        Returns the ID and event position of the last event in a room at or before a
+        stream ordering.
+
+        Args:
+            room_id
+            end_token: The token used to stream from
+
+        Returns:
+            The ID of the most recent event and it's position, or None if there are no
+            events in the room before this stream ordering.
+        """
+
+        def get_last_event_pos_in_room_before_stream_ordering_txn(
            txn: LoggingTransaction,
-        ) -> Optional[str]:
-            # We need to handle the fact that the stream tokens can be vector
-            # clocks. We do this by getting all rows between the minimum and
-            # maximum stream ordering in the token, plus one row less than the
-            # minimum stream ordering. We then filter the results against the
-            # token and return the first row that matches.
+        ) -> Optional[Tuple[str, PersistedEventPosition]]:
+            # We're looking for the closest event at or before the token. We need to
+            # handle the fact that the stream token can be a vector clock (with an
+            # `instance_map`) and events can be persisted on different instances
+            # (sharded event persisters). The first subquery handles the events that
+            # would be within the vector clock and gets all rows between the minimum and
+            # maximum stream ordering in the token which need to be filtered against the
+            # `instance_map`. The second subquery handles the "before" case and finds
+            # the first row before the token. We then filter out any results past the
+            # token's vector clock and return the first row that matches.
+            min_stream = end_token.stream
+            max_stream = end_token.get_max_stream_pos()

+            # We use `union all` because we don't need any of the deduplication logic
+            # (`union` is really a union + distinct). `UNION ALL` does preserve the
+            # ordering of the operand queries but there is no actual gurantee that it
+            # has this behavior in all scenarios so we need the extra `ORDER BY` at the
+            # bottom.
            sql = """
                SELECT * FROM (
                    SELECT instance_name, stream_ordering, topological_ordering, event_id
@@ -931,7 +970,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
                        AND rejections.event_id IS NULL
                    ORDER BY stream_ordering DESC
                ) AS a
-                UNION
+                UNION ALL
                SELECT * FROM (
                    SELECT instance_name, stream_ordering, topological_ordering, event_id
                    FROM events
@@ -943,15 +982,16 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
                    ORDER BY stream_ordering DESC
                    LIMIT 1
                ) AS b
+                ORDER BY stream_ordering DESC
            """
            txn.execute(
                sql,
                (
                    room_id,
-                    end_token.stream,
-                    end_token.get_max_stream_pos(),
+                    min_stream,
+                    max_stream,
                    room_id,
-                    end_token.stream,
+                    min_stream,
                ),
            )

@@ -963,13 +1003,15 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
                    topological_ordering=topological_ordering,
                    stream_ordering=stream_ordering,
                ):
-                    return event_id
+                    return event_id, PersistedEventPosition(
+                        instance_name, stream_ordering
+                    )

            return None

        return await self.db_pool.runInteraction(
-            "get_last_event_in_room_before_stream_ordering",
-            get_last_event_in_room_before_stream_ordering_txn,
+            "get_last_event_pos_in_room_before_stream_ordering",
+            get_last_event_pos_in_room_before_stream_ordering_txn,
        )

    async def get_current_room_stream_token_for_room_id(
@@ -1281,7 +1281,7 @@ def _parse_words_with_regex(search_term: str) -> List[str]:
    Break down search term into words, when we don't have ICU available.
    See: `_parse_words`
    """
-    return re.findall(r"([\w\-]+)", search_term, re.UNICODE)
+    return re.findall(r"([\w-]+)", search_term, re.UNICODE)


 def _parse_words_with_icu(search_term: str) -> List[str]:
@@ -1303,15 +1303,69 @@ def _parse_words_with_icu(search_term: str) -> List[str]:
        if j < 0:
            break

-        result = search_term[i:j]
+        # We want to make sure that we split on `@` and `:` specifically, as
+        # they occur in user IDs.
+        for result in re.split(r"[@:]+", search_term[i:j]):
+            results.append(result.strip())
+
+        i = j
+
+    # libicu will break up words that have punctuation in them, but to handle
+    # cases where user IDs have '-', '.' and '_' in them we want to *not* break
+    # those into words and instead allow the DB to tokenise them how it wants.
+    #
+    # In particular, user-71 in postgres gets tokenised to "user, -71", and this
+    # will not match a query for "user, 71".
+    new_results: List[str] = []
+    i = 0
+    while i < len(results):
+        curr = results[i]
+
+        prev = None
+        next = None
+        if i > 0:
+            prev = results[i - 1]
+        if i + 1 < len(results):
+            next = results[i + 1]
+
+        i += 1

        # libicu considers spaces and punctuation between words as words, but we don't
        # want to include those in results as they would result in syntax errors in SQL
        # queries (e.g. "foo bar" would result in the search query including "foo &  &
        # bar").
-        if len(re.findall(r"([\w\-]+)", result, re.UNICODE)):
-            results.append(result)
+        if not curr:
+            continue

-        i = j
+        if curr in ["-", ".", "_"]:
+            prefix = ""
+            suffix = ""

-    return results
+            # Check if the next item is a word, and if so use it as the suffix.
+            # We check for if its a word as we don't want to concatenate
+            # multiple punctuation marks.
+            if next is not None and re.match(r"\w", next):
+                suffix = next
+                i += 1  # We're using next, so we skip it in the outer loop.
+            else:
+                # We want to avoid creating terms like "user-", as we should
+                # strip trailing punctuation.
+                continue
+
+            if prev and re.match(r"\w", prev) and new_results:
+                prefix = new_results[-1]
+                new_results.pop()
+
+            # We might not have a prefix here, but that's fine as we want to
+            # ensure that we don't strip preceding punctuation e.g. '-71'
+            # shouldn't be converted to '71'.
+
+            new_results.append(f"{prefix}{curr}{suffix}")
+            continue
+        elif not re.match(r"\w", curr):
+            # Ignore other punctuation
+            continue
+
+        new_results.append(curr)
+
+    return new_results
@@ -35,7 +35,7 @@ class RoomsForUser:
    sender: str
    membership: str
    event_id: str
-    stream_ordering: int
+    event_pos: PersistedEventPosition
    room_version_id: str


@@ -0,0 +1,20 @@
+--
+-- This file is licensed under the Affero General Public License (AGPL) version 3.
+--
+-- Copyright (C) 2024 New Vector, Ltd
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU Affero General Public License as
+-- published by the Free Software Foundation, either version 3 of the
+-- License, or (at your option) any later version.
+--
+-- See the GNU Affero General Public License for more details:
+-- <https://www.gnu.org/licenses/agpl-3.0.html>.
+
+CREATE TABLE room_reports (
+    id BIGINT NOT NULL PRIMARY KEY,
+    received_ts BIGINT NOT NULL,
+    room_id TEXT NOT NULL,
+    user_id TEXT NOT NULL,
+    reason TEXT NOT NULL
+);
@@ -19,6 +19,8 @@ class EventInternalMetadata:

    stream_ordering: Optional[int]
    """the stream ordering of this event. None, until it has been persisted."""
+    instance_name: Optional[str]
+    """the instance name of the server that persisted this event. None, until it has been persisted."""

    outlier: bool
    """whether this event is an outlier (ie, whether we have the state at that
@@ -0,0 +1,252 @@
+#
+# This file is licensed under the Affero General Public License (AGPL) version 3.
+#
+# Copyright (C) 2024 New Vector, Ltd
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# See the GNU Affero General Public License for more details:
+# <https://www.gnu.org/licenses/agpl-3.0.html>.
+#
+# Originally licensed under the Apache License, Version 2.0:
+# <http://www.apache.org/licenses/LICENSE-2.0>.
+#
+# [This file includes modifications made by New Vector Limited]
+#
+#
+from enum import Enum
+from typing import TYPE_CHECKING, Dict, Final, List, Optional, Tuple
+
+import attr
+from typing_extensions import TypedDict
+
+from synapse._pydantic_compat import HAS_PYDANTIC_V2
+
+if TYPE_CHECKING or HAS_PYDANTIC_V2:
+    from pydantic.v1 import Extra
+else:
+    from pydantic import Extra
+
+from synapse.events import EventBase
+from synapse.types import JsonMapping, StreamToken, UserID
+from synapse.types.rest.client import SlidingSyncBody
+
+
+class ShutdownRoomParams(TypedDict):
+    """
+    Attributes:
+        requester_user_id:
+            User who requested the action. Will be recorded as putting the room on the
+            blocking list.
+        new_room_user_id:
+            If set, a new room will be created with this user ID
+            as the creator and admin, and all users in the old room will be
+            moved into that room. If not set, no new room will be created
+            and the users will just be removed from the old room.
+        new_room_name:
+            A string representing the name of the room that new users will
+            be invited to. Defaults to `Content Violation Notification`
+        message:
+            A string containing the first message that will be sent as
+            `new_room_user_id` in the new room. Ideally this will clearly
+            convey why the original room was shut down.
+            Defaults to `Sharing illegal content on this server is not
+            permitted and rooms in violation will be blocked.`
+        block:
+            If set to `true`, this room will be added to a blocking list,
+            preventing future attempts to join the room. Defaults to `false`.
+        purge:
+            If set to `true`, purge the given room from the database.
+        force_purge:
+            If set to `true`, the room will be purged from database
+            even if there are still users joined to the room.
+    """
+
+    requester_user_id: Optional[str]
+    new_room_user_id: Optional[str]
+    new_room_name: Optional[str]
+    message: Optional[str]
+    block: bool
+    purge: bool
+    force_purge: bool
+
+
+class ShutdownRoomResponse(TypedDict):
+    """
+    Attributes:
+        kicked_users: An array of users (`user_id`) that were kicked.
+        failed_to_kick_users:
+            An array of users (`user_id`) that that were not kicked.
+        local_aliases:
+            An array of strings representing the local aliases that were
+            migrated from the old room to the new.
+        new_room_id: A string representing the room ID of the new room.
+    """
+
+    kicked_users: List[str]
+    failed_to_kick_users: List[str]
+    local_aliases: List[str]
+    new_room_id: Optional[str]
+
+
+class SlidingSyncConfig(SlidingSyncBody):
+    """
+    Inherit from `SlidingSyncBody` since we need all of the same fields and add a few
+    extra fields that we need in the handler
+    """
+
+    user: UserID
+    device_id: Optional[str]
+
+    # Pydantic config
+    class Config:
+        # By default, ignore fields that we don't recognise.
+        extra = Extra.ignore
+        # By default, don't allow fields to be reassigned after parsing.
+        allow_mutation = False
+        # Allow custom types like `UserID` to be used in the model
+        arbitrary_types_allowed = True
+
+
+class OperationType(Enum):
+    """
+    Represents the operation types in a Sliding Sync window.
+
+    Attributes:
+        SYNC: Sets a range of entries. Clients SHOULD discard what they previous knew about
+            entries in this range.
+        INSERT: Sets a single entry. If the position is not empty then clients MUST move
+            entries to the left or the right depending on where the closest empty space is.
+        DELETE: Remove a single entry. Often comes before an INSERT to allow entries to move
+            places.
+        INVALIDATE: Remove a range of entries. Clients MAY persist the invalidated range for
+            offline support, but they should be treated as empty when additional operations
+            which concern indexes in the range arrive from the server.
+    """
+
+    SYNC: Final = "SYNC"
+    INSERT: Final = "INSERT"
+    DELETE: Final = "DELETE"
+    INVALIDATE: Final = "INVALIDATE"
+
+
+@attr.s(slots=True, frozen=True, auto_attribs=True)
+class SlidingSyncResult:
+    """
+    The Sliding Sync result to be serialized to JSON for a response.
+
+    Attributes:
+        next_pos: The next position token in the sliding window to request (next_batch).
+        lists: Sliding window API. A map of list key to list results.
+        rooms: Room subscription API. A map of room ID to room subscription to room results.
+        extensions: Extensions API. A map of extension key to extension results.
+    """
+
+    @attr.s(slots=True, frozen=True, auto_attribs=True)
+    class RoomResult:
+        """
+        Attributes:
+            name: Room name or calculated room name.
+            avatar: Room avatar
+            heroes: List of stripped membership events (containing `user_id` and optionally
+                `avatar_url` and `displayname`) for the users used to calculate the room name.
+            initial: Flag which is set when this is the first time the server is sending this
+                data on this connection. Clients can use this flag to replace or update
+                their local state. When there is an update, servers MUST omit this flag
+                entirely and NOT send "initial":false as this is wasteful on bandwidth. The
+                absence of this flag means 'false'.
+            required_state: The current state of the room
+            timeline: Latest events in the room. The last event is the most recent
+            is_dm: Flag to specify whether the room is a direct-message room (most likely
+                between two people).
+            invite_state: Stripped state events. Same as `rooms.invite.$room_id.invite_state`
+                in sync v2, absent on joined/left rooms
+            prev_batch: A token that can be passed as a start parameter to the
+                `/rooms/<room_id>/messages` API to retrieve earlier messages.
+            limited: True if their are more events than fit between the given position and now.
+                Sync again to get more.
+            joined_count: The number of users with membership of join, including the client's
+                own user ID. (same as sync `v2 m.joined_member_count`)
+            invited_count: The number of users with membership of invite. (same as sync v2
+                `m.invited_member_count`)
+            notification_count: The total number of unread notifications for this room. (same
+                as sync v2)
+            highlight_count: The number of unread notifications for this room with the highlight
+                flag set. (same as sync v2)
+            num_live: The number of timeline events which have just occurred and are not historical.
+                The last N events are 'live' and should be treated as such. This is mostly
+                useful to determine whether a given @mention event should make a noise or not.
+                Clients cannot rely solely on the absence of `initial: true` to determine live
+                events because if a room not in the sliding window bumps into the window because
+                of an @mention it will have `initial: true` yet contain a single live event
+                (with potentially other old events in the timeline).
+        """
+
+        name: str
+        avatar: Optional[str]
+        heroes: Optional[List[EventBase]]
+        initial: bool
+        required_state: List[EventBase]
+        timeline: List[EventBase]
+        is_dm: bool
+        invite_state: List[EventBase]
+        prev_batch: StreamToken
+        limited: bool
+        joined_count: int
+        invited_count: int
+        notification_count: int
+        highlight_count: int
+        num_live: int
+
+    @attr.s(slots=True, frozen=True, auto_attribs=True)
+    class SlidingWindowList:
+        """
+        Attributes:
+            count: The total number of entries in the list. Always present if this list
+                is.
+            ops: The sliding list operations to perform.
+        """
+
+        @attr.s(slots=True, frozen=True, auto_attribs=True)
+        class Operation:
+            """
+            Attributes:
+                op: The operation type to perform.
+                range: Which index positions are affected by this operation. These are
+                    both inclusive.
+                room_ids: Which room IDs are affected by this operation. These IDs match
+                    up to the positions in the `range`, so the last room ID in this list
+                    matches the 9th index. The room data is held in a separate object.
+            """
+
+            op: OperationType
+            range: Tuple[int, int]
+            room_ids: List[str]
+
+        count: int
+        ops: List[Operation]
+
+    next_pos: StreamToken
+    lists: Dict[str, SlidingWindowList]
+    rooms: Dict[str, RoomResult]
+    extensions: JsonMapping
+
+    def __bool__(self) -> bool:
+        """Make the result appear empty if there are no updates. This is used
+        to tell if the notifier needs to wait for more events when polling for
+        events.
+        """
+        return bool(self.lists or self.rooms or self.extensions)
+
+    @staticmethod
+    def empty(next_pos: StreamToken) -> "SlidingSyncResult":
+        "Return a new empty result"
+        return SlidingSyncResult(
+            next_pos=next_pos,
+            lists={},
+            rooms={},
+            extensions={},
+        )
@@ -0,0 +1,309 @@
+#
+# This file is licensed under the Affero General Public License (AGPL) version 3.
+#
+# Copyright 2022 The Matrix.org Foundation C.I.C.
+# Copyright (C) 2023 New Vector, Ltd
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# See the GNU Affero General Public License for more details:
+# <https://www.gnu.org/licenses/agpl-3.0.html>.
+#
+# Originally licensed under the Apache License, Version 2.0:
+# <http://www.apache.org/licenses/LICENSE-2.0>.
+#
+# [This file includes modifications made by New Vector Limited]
+#
+#
+from typing import TYPE_CHECKING, Dict, List, Optional, Tuple, Union
+
+from synapse._pydantic_compat import HAS_PYDANTIC_V2
+
+if TYPE_CHECKING or HAS_PYDANTIC_V2:
+    from pydantic.v1 import (
+        Extra,
+        StrictBool,
+        StrictInt,
+        StrictStr,
+        conint,
+        constr,
+        validator,
+    )
+else:
+    from pydantic import (
+        Extra,
+        StrictBool,
+        StrictInt,
+        StrictStr,
+        conint,
+        constr,
+        validator,
+    )
+
+from synapse.types.rest import RequestBodyModel
+from synapse.util.threepids import validate_email
+
+
+class AuthenticationData(RequestBodyModel):
+    """
+    Data used during user-interactive authentication.
+
+    (The name "Authentication Data" is taken directly from the spec.)
+
+    Additional keys will be present, depending on the `type` field. Use
+    `.dict(exclude_unset=True)` to access them.
+    """
+
+    class Config:
+        extra = Extra.allow
+
+    session: Optional[StrictStr] = None
+    type: Optional[StrictStr] = None
+
+
+if TYPE_CHECKING:
+    ClientSecretStr = StrictStr
+else:
+    # See also assert_valid_client_secret()
+    ClientSecretStr = constr(
+        regex="[0-9a-zA-Z.=_-]",  # noqa: F722
+        min_length=1,
+        max_length=255,
+        strict=True,
+    )
+
+
+class ThreepidRequestTokenBody(RequestBodyModel):
+    client_secret: ClientSecretStr
+    id_server: Optional[StrictStr]
+    id_access_token: Optional[StrictStr]
+    next_link: Optional[StrictStr]
+    send_attempt: StrictInt
+
+    @validator("id_access_token", always=True)
+    def token_required_for_identity_server(
+        cls, token: Optional[str], values: Dict[str, object]
+    ) -> Optional[str]:
+        if values.get("id_server") is not None and token is None:
+            raise ValueError("id_access_token is required if an id_server is supplied.")
+        return token
+
+
+class EmailRequestTokenBody(ThreepidRequestTokenBody):
+    email: StrictStr
+
+    # Canonicalise the email address. The addresses are all stored canonicalised
+    # in the database. This allows the user to reset his password without having to
+    # know the exact spelling (eg. upper and lower case) of address in the database.
+    # Without this, an email stored in the database as "foo@bar.com" would cause
+    # user requests for "FOO@bar.com" to raise a Not Found error.
+    _email_validator = validator("email", allow_reuse=True)(validate_email)
+
+
+if TYPE_CHECKING:
+    ISO3116_1_Alpha_2 = StrictStr
+else:
+    # Per spec: two-letter uppercase ISO-3166-1-alpha-2
+    ISO3116_1_Alpha_2 = constr(regex="[A-Z]{2}", strict=True)
+
+
+class MsisdnRequestTokenBody(ThreepidRequestTokenBody):
+    country: ISO3116_1_Alpha_2
+    phone_number: StrictStr
+
+
+class SlidingSyncBody(RequestBodyModel):
+    """
+    Sliding Sync API request body.
+
+    Attributes:
+        lists: Sliding window API. A map of list key to list information
+            (:class:`SlidingSyncList`). Max lists: 100. The list keys should be
+            arbitrary strings which the client is using to refer to the list. Keep this
+            small as it needs to be sent a lot. Max length: 64 bytes.
+        room_subscriptions: Room subscription API. A map of room ID to room subscription
+            information. Used to subscribe to a specific room. Sometimes clients know
+            exactly which room they want to get information about e.g by following a
+            permalink or by refreshing a webapp currently viewing a specific room. The
+            sliding window API alone is insufficient for this use case because there's
+            no way to say "please track this room explicitly".
+        extensions: Extensions API. A map of extension key to extension config.
+    """
+
+    class CommonRoomParameters(RequestBodyModel):
+        """
+        Common parameters shared between the sliding window and room subscription APIs.
+
+        Attributes:
+            required_state: Required state for each room returned. An array of event
+                type and state key tuples. Elements in this array are ORd together to
+                produce the final set of state events to return. One unique exception is
+                when you request all state events via `["*", "*"]`. When used, all state
+                events are returned by default, and additional entries FILTER OUT the
+                returned set of state events. These additional entries cannot use `*`
+                themselves. For example, `["*", "*"], ["m.room.member",
+                "@alice:example.com"]` will *exclude* every `m.room.member` event
+                *except* for `@alice:example.com`, and include every other state event.
+                In addition, `["*", "*"], ["m.space.child", "*"]` is an error, the
+                `m.space.child` filter is not required as it would have been returned
+                anyway.
+            timeline_limit: The maximum number of timeline events to return per response.
+                (Max 1000 messages)
+            include_old_rooms: Determines if `predecessor` rooms are included in the
+                `rooms` response. The user MUST be joined to old rooms for them to show up
+                in the response.
+        """
+
+        class IncludeOldRooms(RequestBodyModel):
+            timeline_limit: StrictInt
+            required_state: List[Tuple[StrictStr, StrictStr]]
+
+        required_state: List[Tuple[StrictStr, StrictStr]]
+        # mypy workaround via https://github.com/pydantic/pydantic/issues/156#issuecomment-1130883884
+        if TYPE_CHECKING:
+            timeline_limit: int
+        else:
+            timeline_limit: conint(le=1000, strict=True)  # type: ignore[valid-type]
+        include_old_rooms: Optional[IncludeOldRooms] = None
+
+    class SlidingSyncList(CommonRoomParameters):
+        """
+        Attributes:
+            ranges: Sliding window ranges. If this field is missing, no sliding window
+                is used and all rooms are returned in this list. Integers are
+                *inclusive*.
+            slow_get_all_rooms: Just get all rooms (for clients that don't want to deal with
+                sliding windows). When true, the `ranges` field is ignored.
+            required_state: Required state for each room returned. An array of event
+                type and state key tuples. Elements in this array are ORd together to
+                produce the final set of state events to return.
+
+                One unique exception is when you request all state events via `["*",
+                "*"]`. When used, all state events are returned by default, and
+                additional entries FILTER OUT the returned set of state events. These
+                additional entries cannot use `*` themselves. For example, `["*", "*"],
+                ["m.room.member", "@alice:example.com"]` will *exclude* every
+                `m.room.member` event *except* for `@alice:example.com`, and include
+                every other state event. In addition, `["*", "*"], ["m.space.child",
+                "*"]` is an error, the `m.space.child` filter is not required as it
+                would have been returned anyway.
+
+                Room members can be lazily-loaded by using the special `$LAZY` state key
+                (`["m.room.member", "$LAZY"]`). Typically, when you view a room, you
+                want to retrieve all state events except for m.room.member events which
+                you want to lazily load. To get this behaviour, clients can send the
+                following::
+
+                    {
+                        "required_state": [
+                            // activate lazy loading
+                            ["m.room.member", "$LAZY"],
+                            // request all state events _except_ for m.room.member
+                            events which are lazily loaded
+                            ["*", "*"]
+                        ]
+                    }
+
+            timeline_limit: The maximum number of timeline events to return per response.
+            include_old_rooms: Determines if `predecessor` rooms are included in the
+                `rooms` response. The user MUST be joined to old rooms for them to show up
+                in the response.
+            include_heroes: Return a stripped variant of membership events (containing
+                `user_id` and optionally `avatar_url` and `displayname`) for the users used
+                to calculate the room name.
+            filters: Filters to apply to the list before sorting.
+        """
+
+        class Filters(RequestBodyModel):
+            """
+            All fields are applied with AND operators, hence if `is_dm: True` and
+            `is_encrypted: True` then only Encrypted DM rooms will be returned. The
+            absence of fields implies no filter on that criteria: it does NOT imply
+            `False`. These fields may be expanded through use of extensions.
+
+            Attributes:
+                is_dm: Flag which only returns rooms present (or not) in the DM section
+                    of account data. If unset, both DM rooms and non-DM rooms are returned.
+                    If False, only non-DM rooms are returned. If True, only DM rooms are
+                    returned.
+                spaces: Filter the room based on the space they belong to according to
+                    `m.space.child` state events. If multiple spaces are present, a room can
+                    be part of any one of the listed spaces (OR'd). The server will inspect
+                    the `m.space.child` state events for the JOINED space room IDs given.
+                    Servers MUST NOT navigate subspaces. It is up to the client to give a
+                    complete list of spaces to navigate. Only rooms directly mentioned as
+                    `m.space.child` events in these spaces will be returned. Unknown spaces
+                    or spaces the user is not joined to will be ignored.
+                is_encrypted: Flag which only returns rooms which have an
+                    `m.room.encryption` state event. If unset, both encrypted and
+                    unencrypted rooms are returned. If `False`, only unencrypted rooms are
+                    returned. If `True`, only encrypted rooms are returned.
+                is_invite: Flag which only returns rooms the user is currently invited
+                    to. If unset, both invited and joined rooms are returned. If `False`, no
+                    invited rooms are returned. If `True`, only invited rooms are returned.
+                room_types: If specified, only rooms where the `m.room.create` event has
+                    a `type` matching one of the strings in this array will be returned. If
+                    this field is unset, all rooms are returned regardless of type. This can
+                    be used to get the initial set of spaces for an account. For rooms which
+                    do not have a room type, use `null`/`None` to include them.
+                not_room_types: Same as `room_types` but inverted. This can be used to
+                    filter out spaces from the room list. If a type is in both `room_types`
+                    and `not_room_types`, then `not_room_types` wins and they are not included
+                    in the result.
+                room_name_like: Filter the room name. Case-insensitive partial matching
+                    e.g 'foo' matches 'abFooab'. The term 'like' is inspired by SQL 'LIKE',
+                    and the text here is similar to '%foo%'.
+                tags: Filter the room based on its room tags. If multiple tags are
+                    present, a room can have any one of the listed tags (OR'd).
+                not_tags: Filter the room based on its room tags. Takes priority over
+                    `tags`. For example, a room with tags A and B with filters `tags: [A]`
+                    `not_tags: [B]` would NOT be included because `not_tags` takes priority over
+                    `tags`. This filter is useful if your rooms list does NOT include the
+                    list of favourite rooms again.
+            """
+
+            is_dm: Optional[StrictBool] = None
+            spaces: Optional[List[StrictStr]] = None
+            is_encrypted: Optional[StrictBool] = None
+            is_invite: Optional[StrictBool] = None
+            room_types: Optional[List[Union[StrictStr, None]]] = None
+            not_room_types: Optional[List[StrictStr]] = None
+            room_name_like: Optional[StrictStr] = None
+            tags: Optional[List[StrictStr]] = None
+            not_tags: Optional[List[StrictStr]] = None
+
+        # mypy workaround via https://github.com/pydantic/pydantic/issues/156#issuecomment-1130883884
+        if TYPE_CHECKING:
+            ranges: Optional[List[Tuple[int, int]]] = None
+        else:
+            ranges: Optional[List[Tuple[conint(ge=0, strict=True), conint(ge=0, strict=True)]]] = None  # type: ignore[valid-type]
+        slow_get_all_rooms: Optional[StrictBool] = False
+        include_heroes: Optional[StrictBool] = False
+        filters: Optional[Filters] = None
+
+    class RoomSubscription(CommonRoomParameters):
+        pass
+
+    class Extension(RequestBodyModel):
+        enabled: Optional[StrictBool] = False
+        lists: Optional[List[StrictStr]] = None
+        rooms: Optional[List[StrictStr]] = None
+
+    # mypy workaround via https://github.com/pydantic/pydantic/issues/156#issuecomment-1130883884
+    if TYPE_CHECKING:
+        lists: Optional[Dict[str, SlidingSyncList]] = None
+    else:
+        lists: Optional[Dict[constr(max_length=64, strict=True), SlidingSyncList]] = None  # type: ignore[valid-type]
+    room_subscriptions: Optional[Dict[StrictStr, RoomSubscription]] = None
+    extensions: Optional[Dict[StrictStr, Extension]] = None
+
+    @validator("lists")
+    def lists_length_check(
+        cls, value: Optional[Dict[str, SlidingSyncList]]
+    ) -> Optional[Dict[str, SlidingSyncList]]:
+        if value is not None:
+            assert len(value) <= 100, f"Max lists: 100 but saw {len(value)}"
+        return value
@@ -82,7 +82,6 @@ async def filter_events_for_client(
    is_peeking: bool = False,
    always_include_ids: FrozenSet[str] = frozenset(),
    filter_send_to_client: bool = True,
-    msc4115_membership_on_events: bool = False,
 ) -> List[EventBase]:
    """
    Check which events a user is allowed to see. If the user can see the event but its
@@ -101,12 +100,10 @@ async def filter_events_for_client(
        filter_send_to_client: Whether we're checking an event that's going to be
            sent to a client. This might not always be the case since this function can
            also be called to check whether a user can see the state at a given point.
-        msc4115_membership_on_events: Whether to include the requesting user's
-            membership in the "unsigned" data, per MSC4115.

    Returns:
-        The filtered events. If `msc4115_membership_on_events` is true, the `unsigned`
-        data is annotated with the membership state of `user_id` at each event.
+        The filtered events. The `unsigned` data is annotated with the membership state
+        of `user_id` at each event.
    """
    # Filter out events that have been soft failed so that we don't relay them
    # to clients.
@@ -151,7 +148,7 @@ async def filter_events_for_client(
            filter_send_to_client=filter_send_to_client,
            sender_ignored=event.sender in ignore_list,
            always_include_ids=always_include_ids,
-            retention_policy=retention_policies[room_id],
+            retention_policy=retention_policies[event.room_id],
            state=state_after_event,
            is_peeking=is_peeking,
            sender_erased=erased_senders.get(event.sender, False),
@@ -159,9 +156,6 @@ async def filter_events_for_client(
        if filtered is None:
            return None

-        if not msc4115_membership_on_events:
-            return filtered
-
        # Annotate the event with the user's membership after the event.
        #
        # Normally we just look in `state_after_event`, but if the event is an outlier
@@ -186,7 +180,7 @@ async def filter_events_for_client(
        # Copy the event before updating the unsigned data: this shouldn't be persisted
        # to the cache!
        cloned = clone_event(filtered)
-        cloned.unsigned[EventUnsignedContentFields.MSC4115_MEMBERSHIP] = user_membership
+        cloned.unsigned[EventUnsignedContentFields.MEMBERSHIP] = user_membership

        return cloned

@@ -625,6 +625,8 @@ class CloneEventTestCase(stdlib_unittest.TestCase):
        )
        original.internal_metadata.stream_ordering = 1234
        self.assertEqual(original.internal_metadata.stream_ordering, 1234)
+        original.internal_metadata.instance_name = "worker1"
+        self.assertEqual(original.internal_metadata.instance_name, "worker1")

        cloned = clone_event(original)
        cloned.unsigned["b"] = 3
@@ -632,6 +634,7 @@ class CloneEventTestCase(stdlib_unittest.TestCase):
        self.assertEqual(original.unsigned, {"a": 1, "b": 2})
        self.assertEqual(cloned.unsigned, {"a": 1, "b": 3})
        self.assertEqual(cloned.internal_metadata.stream_ordering, 1234)
+        self.assertEqual(cloned.internal_metadata.instance_name, "worker1")
        self.assertEqual(cloned.internal_metadata.txn_id, "txn")


@@ -541,6 +541,8 @@ class MSC3861OAuthDelegation(HomeserverTestCase):

        self.assertEqual(channel.code, 200, channel.json_body)

+        # Try uploading *different* keys; it should cause a 501 error.
+        keys_upload_body = self.make_device_keys(USER_ID, DEVICE)
        channel = self.make_request(
            "POST",
            "/_matrix/client/v3/keys/device_signing/upload",
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Erik Johnston	4f91482092	More logging	2024-06-19 11:00:08 +01:00
Erik Johnston	9e46ea43f4	Make warning	2024-06-19 10:50:01 +01:00
Erik Johnston	e25062ed75	More logging	2024-06-19 10:46:58 +01:00
Erik Johnston	afc675ba86	Time atexit freeze	2024-06-19 10:43:33 +01:00
Erik Johnston	bdf82efea5	Handle large chain calc better (#17291 ) We calculate the auth chain links outside of the main persist event transaction to ensure that we do not block other event sending during the calculation.	2024-06-19 10:33:53 +01:00
Andrew Morgan	afaf2d9388	Require the 'from' parameter for `/notifications` be an integer (#17283 ) Co-authored-by: Erik Johnston <erikj@element.io>	2024-06-19 10:05:39 +01:00
Andrew Morgan	199223062a	Revert "Support MSC3916 by adding a federation `/download` endpoint" (#17325 )	2024-06-18 16:54:19 +01:00
Jörg Thalheim	97c3d98816	register_new_matrix_user: add password-file flag (#17294 ) Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com> Co-authored-by: Andrew Morgan <andrew@amorgan.xyz>	2024-06-18 16:21:51 +01:00
Quentin Gliech	fa3adc896a	Merge branch 'master' into develop	2024-06-18 12:33:43 +02:00
Johannes Marbach	79767a1108	Add support for via query parameter from MSC4156 (#17322 ) This adds support for the `via` query parameter from https://github.com/matrix-org/matrix-spec-proposals/pull/4156.	2024-06-18 10:03:39 +00:00
Dirk Klimpel	1c7d85fdfe	fix missing quotes for exclude_rooms_from_sync (#17308 ) We tried to configure rooms `exclude_rooms_from_sync`. If we do not quote we get an error. The example should be valid.	2024-06-18 10:37:02 +01:00
dependabot[bot]	088992a484	Bump types-pyyaml from 6.0.12.12 to 6.0.12.20240311 (#17316 )	2024-06-18 10:01:34 +01:00
dependabot[bot]	d17d931a53	Bump docker/build-push-action from 5 to 6 (#17312 )	2024-06-18 09:57:58 +01:00
dependabot[bot]	334123f0cd	Bump dawidd6/action-download-artifact from 5 to 6 (#17313 )	2024-06-18 09:57:42 +01:00
dependabot[bot]	d8e81f67eb	Bump types-netaddr from 1.2.0.20240219 to 1.3.0.20240530 (#17314 )	2024-06-18 09:57:24 +01:00
dependabot[bot]	19a3d5b606	Bump phonenumbers from 8.13.37 to 8.13.39 (#17315 )	2024-06-18 09:57:07 +01:00
dependabot[bot]	52813a8d94	Bump msgpack from 1.0.7 to 1.0.8 (#17317 )	2024-06-18 09:56:56 +01:00
Eric Eastwood	a5485437cf	Add `is_encrypted` filtering to Sliding Sync `/sync` (#17281 ) Based on [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575): Sliding Sync	2024-06-17 12:06:18 -05:00
Eric Eastwood	e5b8a3e37f	Add `stream_ordering` sort to Sliding Sync `/sync` (#17293 ) Sort is no longer configurable and we always sort rooms by the `stream_ordering` of the last event in the room or the point where the user can see up to in cases of leave/ban/invite/knock.	2024-06-17 11:27:14 -05:00
Quentin Gliech	e88332b5f4	Merge branch 'release-v1.109' into develop	2024-06-17 15:51:16 +02:00
Richard van der Hoff	3aae60f17b	Enable cross-signing key upload without UIA (#17284 ) Per MSC3967, which is now stable, we should not require UIA when uploading cross-signing keys for the first time. Fixes: #17227	2024-06-14 11:14:56 +01:00
Richard van der Hoff	2c36a679ae	Include user membership on events (#17282 ) MSC4115 has now completed FCP, so we can enable it by default and switch to the stable identifier.	2024-06-13 21:45:54 +00:00
Eric Eastwood	c12ee0d5ba	Add `is_dm` filtering to Sliding Sync `/sync` (#17277 ) Based on [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575): Sliding Sync	2024-06-13 13:56:58 -05:00
Eric Eastwood	8aaff851b1	Fix `newly_left` rooms not appearing if we returned early (Sliding Sync) (#17301 ) Fix `newly_left` rooms not appearing if we returned early when `membership_snapshot_token.is_before_or_eq(to_token.room_key)`. Introduced in https://github.com/element-hq/synapse/pull/17187 (part of Sliding Sync) The tests didn't catch it because they had a small typo in it `room_id1` vs `room_id2`. Found while working on https://github.com/element-hq/synapse/pull/17293	2024-06-13 11:36:57 -05:00
Eric Eastwood	8c58eb7f17	Add `event.internal_metadata.instance_name` (#17300 ) Add `event.internal_metadata.instance_name` (the worker instance that persisted the event) to go alongside the existing `event.internal_metadata.stream_ordering`. `instance_name` is useful to properly compare and query for events with a token since you need to compare both the `stream_ordering` and `instance_name` against the vector clock/`instance_map` in the `RoomStreamToken`. This is pre-requisite work and may be used in https://github.com/element-hq/synapse/pull/17293 Adding `event.internal_metadata.instance_name` was first mentioned in the initial Sliding Sync PR while pairing with @erikjohnston, see https://github.com/element-hq/synapse/pull/17187/commits/09609cb0dbca3a4cfd9fbf90cc962e765ec469c0#diff-5cd773fb307aa754bd3948871ba118b1ef0303f4d72d42a2d21e38242bf4e096R405-R410	2024-06-13 11:32:50 -05:00
Eric Eastwood	ebdce69f6a	Fix `get_last_event_in_room_before_stream_ordering(...)` finding the wrong last event (#17295 ) PR where this was introduced: https://github.com/matrix-org/synapse/pull/14817 ### What does this affect? `get_last_event_in_room_before_stream_ordering(...)` is used in Sync v2 in a lot of different state calculations. `get_last_event_in_room_before_stream_ordering(...)` is also used in `/rooms/{roomId}/members`	2024-06-13 11:00:52 -05:00
Andrew Morgan	c6eb99c878	Bump `mypy` from 1.8.0 to 1.9.0 (#17297 ) Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>	2024-06-13 15:50:10 +01:00
Quentin Gliech	5db3eec5bc	Clarify that MSC4151 is enabled on matrix.org (#17296 ) This clarifies in the comments that the MSC is being used in matrix.org See #17270	2024-06-13 13:49:00 +00:00
Travis Ralston	f1c4dfb08b	Add report room API (MSC4151) (#17270 ) https://github.com/matrix-org/matrix-spec-proposals/pull/4151 This is intended to be enabled by default for immediate use. When FCP is complete, the unstable endpoint will be dropped and stable endpoint supported instead - no backwards compatibility is expected for the unstable endpoint.	2024-06-12 12:27:46 +02:00
dependabot[bot]	0edf1cacf7	Bump types-jsonschema from 4.21.0.20240311 to 4.22.0.20240610 (#17288 )	2024-06-12 10:52:26 +01:00
dependabot[bot]	d0f90bd04e	Bump jinja2 from 3.1.3 to 3.1.4 (#17287 )	2024-06-12 10:52:14 +01:00
Quentin Gliech	0248ed70a9	Merge branch 'release-v1.109' into develop	2024-06-11 16:25:26 +02:00
dependabot[bot]	863578bfcf	Bump regex from 1.10.4 to 1.10.5 (#17290 )	2024-06-11 10:50:13 +01:00
dependabot[bot]	9e59d18022	Bump dawidd6/action-download-artifact from 3.1.4 to 5 (#17289 )	2024-06-11 10:50:03 +01:00
dependabot[bot]	491365f199	Bump types-pillow from 10.2.0.20240423 to 10.2.0.20240520 (#17285 )	2024-06-11 10:47:03 +01:00
Eric Eastwood	dad1559721	Reorganize Pydantic models and types used in handlers (#17279 ) Spawning from https://github.com/element-hq/synapse/pull/17187#discussion_r1619492779 around wanting to put `SlidingSyncBody` (parse the request in the rest layer), `SlidingSyncConfig` (from the rest layer, pass to the handler), `SlidingSyncResponse` (pass the response from the handler back to the rest layer to respond) somewhere that doesn't contaminate the imports and cause circular import issues. - Moved Pydantic parsing models to `synapse/types/rest` - Moved handler types to `synapse/types/handlers`	2024-06-10 15:03:50 -05:00
Eric Eastwood	265ee88f34	Wrong retention policy being used when filtering events (lint `ControlVarUsedAfterBlockViolation` `WPS441`) (#17272 ) Fix loop var being used outside block. Before this change, we were always using the last room_id's retention policy for all events being filtered. I found this bug with the [new lint rule, `ControlVarUsedAfterBlockViolation` `WPS441`](https://github.com/astral-sh/ruff/pull/11769), that I re-implemented in `ruff`. Shout-out to @reivilibre for all the help in the beginning! ### Pull Request Checklist <!-- Please read https://element-hq.github.io/synapse/latest/development/contributing_guide.html before submitting your pull request --> * [x] Pull request is based on the develop branch * [x] Pull request includes a [changelog file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog). The entry should: - Be a short description of your change which makes sense to users. "Fixed a bug that prevented receiving messages from other servers." instead of "Moved X method from `EventStore` to `EventWorkerStore`.". - Use markdown where necessary, mostly for `code blocks`. - End with either a period (.) or an exclamation mark (!). - Start with a capital letter. - Feel free to credit yourself, by adding a sentence "Contributed by @github_username." or "Contributed by [Your Name]." to the end of the entry. * [x] [Code style](https://element-hq.github.io/synapse/latest/code_style.html) is correct (run the [linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters))	2024-06-10 09:48:38 -05:00
Shay	ab94bce02c	Support MSC3916 by adding a federation `/download` endpoint (#17172 )	2024-06-07 13:54:28 +01:00
reivilibre	17d6c28285	Add debug logging for when room keys are uploaded, including whether they are replacing other room keys. (#17266 ) Fixes: #17013 Add logging for whether room keys are replaced This is motivated by the Crypto team who need to diagnose crypto issues. The existing opentracing logging is not enough because it is not enabled for all users.	2024-06-07 12:01:21 +01:00
Eric Eastwood	4a7c58642c	Add Sliding Sync `/sync` endpoint (initial implementation) (#17187 ) Based on [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575): Sliding Sync This iteration only focuses on returning the list of room IDs in the sliding window API (without sorting/filtering). Rooms appear in the Sliding sync response based on: - `invite`, `join`, `knock`, `ban` membership events - Kicks (`leave` membership events where `sender` is different from the `user_id`/`state_key`) - `newly_left` (rooms that were left during the given token range, > `from_token` and <= `to_token`) - In order for bans/kicks to not show up, you need to `/forget` those rooms. This doesn't modify the event itself though and only adds the `forgotten` flag to `room_memberships` in Synapse. There isn't a way to tell when a room was forgotten at the moment so we can't factor it into the from/to range. ### Example request `POST http://localhost:8008/_matrix/client/unstable/org.matrix.msc3575/sync` ```json { "lists": { "foo-list": { "ranges": [ [0, 99] ], "sort": [ "by_notification_level", "by_recency", "by_name" ], "required_state": [ ["m.room.join_rules", ""], ["m.room.history_visibility", ""], ["m.space.child", "*"] ], "timeline_limit": 100 } } } ``` Response: ```json { "next_pos": "s58_224_0_13_10_1_1_16_0_1", "lists": { "foo-list": { "count": 1, "ops": [ { "op": "SYNC", "range": [0, 99], "room_ids": [ "!MmgikIyFzsuvtnbvVG:my.synapse.linux.server" ] } ] } }, "rooms": {}, "extensions": {} } ```	2024-06-06 14:44:32 -05:00
Erik Johnston	ce9385819b	Handle OTK uploads off master (#17271 ) And fallback keys uploads. Only device keys need handling on master	2024-06-06 17:47:02 +01:00
Erik Johnston	a963f579de	Don't try and resync devices for down hosts (#17273 ) It's just a waste of time if we won't even query the remote host as its marked as down.	2024-06-06 17:46:52 +01:00
Erik Johnston	3f06bbc0ac	Always return OTK counts (#17275 ) Broke in https://github.com/element-hq/synapse/pull/17215	2024-06-06 17:10:58 +01:00
Shay	fcbc79bb87	Ratelimiting of remote media downloads (#17256 )	2024-06-05 13:43:36 +01:00
Erik Johnston	aabf577166	Handle hyphens in user dir search porperly (#17254 ) c.f. #16675	2024-06-05 10:40:34 +01:00
Eric Eastwood	7d8f0ef351	Use fully-qualified `PersistedEventPosition` when returning `RoomsForUser` (#17265 ) Use fully-qualified `PersistedEventPosition` (`instance_name` and `stream_ordering`) when returning `RoomsForUser` to facilitate proper comparisons and `RoomStreamToken` generation. Spawning from https://github.com/element-hq/synapse/pull/17187 where we want to utilize this change	2024-06-04 12:58:03 -05:00
Andrew Morgan	eab0b548e4	Merge branch 'release-v1.109' into develop	2024-06-04 12:37:07 +01:00
dependabot[bot]	81cef38d4b	Bump sentry-sdk from 2.1.1 to 2.3.1 (#17263 )	2024-06-04 11:58:27 +01:00
				`@@ -0,0 +1 @@`
				Add initial implementation of an experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint.
				`@@ -0,0 +1 @@`
				`Fix searching for users with their exact localpart whose ID includes a hyphen.`
				`@@ -0,0 +1 @@`
				Use fully-qualified `PersistedEventPosition` when returning `RoomsForUser` to facilitate proper comparisons and `RoomStreamToken` generation.
				`@@ -0,0 +1 @@`
				`Add debug logging for when room keys are uploaded, including whether they are replacing other room keys.`
				`@@ -0,0 +1 @@`
				`Add support for the unstable [MSC4151](https://github.com/matrix-org/matrix-spec-proposals/pull/4151) report room API.`
				`@@ -0,0 +1 @@`
				`Fix wrong retention policy being used when filtering events.`
				`@@ -0,0 +1 @@`
				`Don't try and resync devices for remote users whose servers are marked as down.`
				`@@ -0,0 +1 @@`
				Fix bug where OTKs were not always included in `/sync` response when using workers.
				`@@ -0,0 +1 @@`
				Add `is_dm` filtering to experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint.