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feat: add matrix provider - #707
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Resolve the homeserver via .well-known/matrix/client, read the profile avatar_url and map the mxc URI to the unauthenticated media download endpoint. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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The title clearly and concisely identifies the main change: adding a Matrix provider. |
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Coverage Report for CI Build 38602632630Warning No base build found for commit Coverage: 97.913%Details
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Actionable comments posted: 3
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Inline comments:
Review comments at @src/providers/index.js:
- Line 37: Update getInputType to recognize full Matrix IDs as usernames before
applying generic domain matching, validating the captured server with
isValidServer first. Preserve domain classification for ordinary domains and
host:port values.
Review comments at @src/providers/matrix.js:
- Line 21: Update the localpart validation in parseInput to allow `/` by
removing only the slash rejection; preserve the existing empty-value and `@`
checks, and do not add space validation.
- Around line 75-83: Update the Matrix profile request in the provider so a
rejected got call returns undefined, matching the existing no-avatar handling
for HTTP errors; guard the absent response before reading its body or
statusCode.
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📒 Files selected for processing: 6
README.mdsrc/providers/index.jssrc/providers/mastodon.jssrc/providers/matrix.jstest/unit/providers/mastodon.jstest/unit/providers/matrix.js
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The Matrix spec allows / in user ID localparts, and the profile request already encodes the user ID with encodeURIComponent. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2 participants
Matrix provider
matrix.well-known/matrix/client+/_matrix/client/v3/profile, mxc to media download@user:server,user:server, bareuser(matrix.org)M_NOT_FOUND, noavatar_url, servers requiring authLive results
/matrix/@matthew:matrix.org/matrix/@zzqxnope9917:matrix.orgObtained by running this branch's provider through the library (
require('./src')().matrix(input)) on 2026-10-14.Adds a
matrixprovider. It returns a Matrix user's profile picture from any homeserver that serves profiles and media without authentication.Input
@user:server(full Matrix user ID).user:server(leading@optional).userresolves onmatrix.org.An explicit port is kept (
@user:example.org:8448). The server part goes through the same strict host validation asmastodon. Malformed IDs make no request.Flow
GET https://<server>/.well-known/matrix/clientand readm.homeserver.base_url. When that is missing, fails, or is not http(s), the provider useshttps://<server>.GET <base>/_matrix/client/v3/profile/<urlencoded user id>/avatar_urlreturns{ avatar_url: "mxc://<origin>/<mediaId>" }.mxc://URI maps to<base>/_matrix/media/v3/download/<origin>/<mediaId>. This is the full-resolution original, not a thumbnail. The mxc URI is checked against a strict pattern before the URL is built.A 4xx profile response (
M_NOT_FOUND, orM_MISSING_TOKENon servers that require auth for profiles), or a missing ornullavatar_url, returnsundefined.SSRF
isReservedIpruns on the server hostname before any request, asmastodondoes.isReservedIpalso runs on the hostname of thebase_urlfrom well-known, because a remote server controls that value.gotbeforeRequestandbeforeRedirecthooks andauto.js'sassertPublicUrlstill apply on top of these checks.Live evidence
The checks below call
require('./src')().matrix(input), which is the real pipeline with reachability checks.Known limits (measured)
401on both the legacydownloadandthumbnailmedia endpoints, because it enforces authenticated media (spec v1.11). The pipeline reports401 Unauthorized, so no avatar is returned.api.mau.chat) requires an access token for profile lookups and returns401 M_MISSING_TOKEN. The provider treats this as a miss./_matrix/client/v1/media/downloadendpoint returns401without a token, matrix.org included. As more servers drop unauthenticated media, coverage will shrink.Tests
npx ava test/unit/providers/matrix.js: 19 passed.gotis a fake routed by URL, so the tests run offline. They cover input parsing, the well-known flow, fallback when well-known is missing or fails, missing user, a user with no avatar, a profile that requires auth, mxc validation, and SSRF on the server and on a hostilebase_url.npx ava test/unit/providers/matrix.js test/unit/providers/index.js test/unit/providers/html-config.js: 110 passed.npx ava(full suite): 558 passed.npx standardon the changed files: clean.🤖 Generated with Claude Code
Note
Medium Risk
New outbound HTTP to user-supplied Matrix homeservers with SSRF mitigations; shared server validation is now exported from Mastodon for reuse.
Overview
Adds a
matrixavatar provider so/matrix/:idcan resolve Matrix profile pictures from public homeservers.The provider parses
@user:server,user:server, or bareuser(defaults to matrix.org), reuses Mastodon’sisValidServerfor host validation, discovers the client API via/.well-known/matrix/client, readsavatar_urlfrom the v3 profile endpoint, and mapsmxc://URIs to the v3 media download URL. Malformed IDs skip outbound calls; 4xx profiles, missing avatars, and auth-gated servers return no image. SSRF checks apply to the server hostname and tom.homeserver.base_urlfrom well-known.README documents Matrix;
mastodonnow exportsisValidServer; unit tests cover Matrix parsing, resolution paths, mxc handling, and SSRF edge cases, plus Mastodon server validation.Reviewed by Cursor Bugbot for commit 4a548cc. Bugbot is set up for automated code reviews on this repo. Configure here.
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