merge: Improve inline quote detection and link previews (resolves #1047 and #1044) (!985)

View MR for information: https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/985

Closes #1047 and #1044

Approved-by: dakkar <dakkar@thenautilus.net>
Approved-by: Marie <github@yuugi.dev>

packages/backend/src/core/UtilityService.ts

@@ -176,4 +176,14 @@ export class UtilityService {
 		const host = this.extractDbHost(uri);
 		return this.isFederationAllowedHost(host);
 	}
+
+	@bindThis
+	public getUrlScheme(url: string): string {
+		try {
+			// Returns in the format "https:" or an empty string
+			return new URL(url).protocol;
+		} catch {
+			return '';
+		}
+	}
 }