add setting to disable proxy account (resolves #766)

packages/backend/src/server/api/endpoints/admin/meta.ts

@@ -601,6 +601,10 @@ export const meta = {
 				enum: instanceUnsignedFetchOptions,
 				optional: false, nullable: false,
 			},
+			enableProxyAccount: {
+				type: 'boolean',
+				optional: false, nullable: false,
+			},
 		},
 	},
 } as const;
@@ -762,6 +766,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				federationHosts: instance.federationHosts,
 				hasLegacyAuthFetchSetting: config.checkActivityPubGetSignature != null,
 				allowUnsignedFetch: instance.allowUnsignedFetch,
+				enableProxyAccount: instance.enableProxyAccount,
 			};
 		});
 	}

packages/backend/src/server/api/endpoints/admin/update-meta.ts

@@ -210,6 +210,10 @@ export const paramDef = {
 			enum: instanceUnsignedFetchOptions,
 			nullable: false,
 		},
+		enableProxyAccount: {
+			type: 'boolean',
+			nullable: false,
+		},
 	},
 	required: [],
 } as const;
@@ -758,6 +762,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				set.allowUnsignedFetch = ps.allowUnsignedFetch;
 			}
 
+			if (ps.enableProxyAccount !== undefined) {
+				set.enableProxyAccount = ps.enableProxyAccount;
+			}
+
 			const before = await this.metaService.fetch(true);
 
 			await this.metaService.update(set);