Implements PLAN.md Phase 5: the Server-Server API. Warp joins rooms on other servers and lets their users join its rooms, invites across servers with the invitee's server countersigning, rejects remote invites (locally if the inviter is unreachable), and exchanges events, typing, receipts and to-device messages with other homeservers — all behind the runtime switch, which now starts and stops real outbound traffic. The protocol lives in internal/federation with no knowledge of rooms: X-Matrix signing (fuzzed parser), the spec's discovery algorithm keeping the dial address and the TLS name apart, a signed client that refuses every request while the switch is off or the policy denies the destination, and a key ring that caches other servers' keys for at most a week, with optional notaries. The roomserver takes events from elsewhere through the spec's intake: signatures and hashes (a hash mismatch keeps the redacted form), the rules against the event's own auth events, against the state before it — with /get_missing_events for small gaps and /state_ids for wide ones — and against the current state, where a failure is a soft failure. Events held without their state are outliers: a column on roomserver_events, because the current state of a room joined over federation is almost all outliers, and excluded from every timeline query. Forks are resolved at the room's head. Membership across servers is make_join/send_join, make_leave/send_leave and countersigned invites, in both directions; m.room.server_acl is enforced on everything another server sends. History before a remote join is backfilled when /messages pages past it, stored at negative stream positions. internal/federationapi is the running component: the inbound endpoints, and an outbound queue that persists what it owes each destination, sends it in transactions of 50 PDUs and 100 EDUs, backs off from ten seconds to six hours, survives restarts, and drops events persisted while federation is off rather than delivering a backlog in one burst. Its Module is what the switch starts and stops. Also: a TLS listener for port 8448, trusted key servers, key validity and an outbound CA bundle in the config; per-destination health and backoff reset in the admin API; remote profiles, aliases and directories in the Client-Server API; a Complement federation profile. See docs/federation.md, including its known gaps (no partial-state joins, no key rotation). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Admin API
Everything under /_warp/admin/v1 is Warp's own, not Matrix. Clients use
the Client-Server API; this is the operator's surface and the backend for
the admin panel (apps/admin, PLAN.md section 8.1).
Authentication
A normal Matrix access token belonging to an account with the admin flag. The panel logs in the way any client does, so there is no second credential to manage:
TOKEN=$(curl -s localhost:8008/_matrix/client/v3/login \
-d '{"type":"m.login.password","identifier":{"type":"m.id.user","user":"root"},"password":"..."}' \
| jq -r .access_token)
curl localhost:8008/_warp/admin/v1/stats -H "Authorization: Bearer $TOKEN"
The token must be in the Authorization header. Unlike the C-S API, the
?access_token= form is not accepted here: an admin token in a URL ends up
in every access log between the browser and the server.
A valid token without the admin flag gets 403 M_FORBIDDEN rather than a
404. The caller is a legitimate user of this server who is not allowed here,
and pretending the endpoint does not exist only makes the panel harder to
debug.
Make the first admin from the command line:
./bin/warp create-account --username root --admin
Endpoints
GET /federation, PUT /federation
The runtime federation switch of PLAN.md section 3.
{
"enabled": false,
"toggleable": true,
"allowlist": [],
"denylist": []
}
PUT {"enabled": true} takes effect on the next request, with no restart,
and answers with the same document. toggleable is false when
federation.allow_runtime_toggle pinned the setting in the config file; a
PUT then returns 409 and the panel should grey the switch out rather
than offer something that will bounce.
Editing the allow and deny lists is Phase 9. They are reported now because the dashboard has to show which servers a running Warp will talk to.
GET /federation/destinations
Delivery health per remote server: the panel's federation status view. Every server this one has queued something for, or has failed to reach, with how much it is still owed.
{
"running": true,
"destinations": [
{
"server_name": "matrix.org",
"failures": 0,
"retry_at_ms": 0,
"last_success_ms": 1760600000000,
"last_failure_ms": 0,
"queued_pdus": 0,
"queued_edus": 0
}
]
}
running is whether the outbound queue is up — false while federation is
switched off. failures counts consecutive failed sends; while it is above
zero the server is being backed off, and retry_at_ms is when the next
attempt is due. The backoff doubles from ten seconds to six hours.
A server started without a signing key has no federation at all, and both
destination endpoints answer 404.
POST /federation/destinations/{serverName}/reset
Forget a server's backoff and try it now — for an operator who knows the
server is back and does not want to wait out a six-hour retry. Answers
{}.
GET /registration, PUT /registration
The same shape, without the lists, for open registration.
GET /users
GET /users?search=ali&limit=50&offset=0
Ordered by localpart. search matches a substring of the localpart or the
display name, case-insensitively. total is the number of users matching
the query rather than the number returned, so the panel can page.
{
"users": [
{
"user_id": "@alice:warp.example",
"display_name": "Alice",
"admin": false,
"deactivated": false,
"created_at_ms": 1760000000000
}
],
"total": 1,
"limit": 50,
"offset": 0
}
POST /users
{"username": "alice", "password": "...", "display_name": "Alice", "admin": false}
201 with the created user. This is how an operator adds an account to a
server with registration turned off — which is the normal state of a
private Warp — so it ignores the registration switch deliberately: it is
the admin's own action, not a public sign-up. username is normalised
(lower-cased) like any other localpart. A taken name is
400 M_USER_IN_USE, an unusable one 400 M_INVALID_USERNAME.
GET /rooms
GET /rooms?search=ops&limit=50&offset=0
Ordered by joined-member count, biggest first, then by room ID — the second
key is not decoration, because paging an order that is not total can show
the same room on two pages and skip another, and ties in member count are
the common case. search matches a substring of the room ID, name, topic or
canonical alias, case-insensitively.
{
"rooms": [
{
"room_id": "!abc:warp.example",
"room_version": "11",
"creator": "@alice:warp.example",
"name": "Operations",
"topic": "Ops chat",
"canonical_alias": "#ops:warp.example",
"join_rule": "public",
"history_visibility": "shared",
"guest_access": "forbidden",
"published": true,
"joined_members": 12,
"created_at_ms": 1760000000000
}
],
"total": 1,
"limit": 50,
"offset": 0
}
Everything after creator is read from the room's current state and kept in
the room's own row. That is denormalisation on purpose: this listing and the
public room directory both order every room by member count and page the
result, which cannot be done by reading each room's state in turn.
GET /rooms/{roomID}
The list row plus the things only a count can answer.
{
"room_id": "!abc:warp.example",
"members": 15,
"invited_members": 2,
"joined_members": 12,
"aliases": ["#ops:warp.example"],
"forward_extremities": ["$sPfXR..."]
}
members counts every m.room.member event in the current state whatever
the membership, because a room with one member and forty bans is not the
same room as one with a single member. forward_extremities is where the
room's DAG ends; there is normally exactly one, and more than one means the
room has forked.
DELETE /rooms/{roomID}
Purges the room: its events, its state, its aliases and its row. There is no undo and the members are not told — the only way to tell them would have been to add an event to a room that no longer exists.
It is a DELETE on the room rather than a POST to an action because that
is what it is, and because the method makes a panel's confirm dialog
mandatory in a way a POST does not. Purging a room that is not there is
404, not a silent success: an operator who sees an OK has to be able to
believe the room was there.
POST /rooms/{roomID}/force_leave
{"user_id": "@alice:warp.example"}
Makes a user leave without asking the room's rules whether they may. A user stuck in a room — one whose power levels are broken, or whose last moderator has gone — is what this exists for, and in such a room the rules are exactly what is in the way. It is still an ordinary membership event, signed and added to the room, so the other members see what happened.
A user who is not in the room gets 403: there is nothing to leave.
GET /stats
The dashboard payload.
{
"server_name": "warp.example",
"version": "0.0.0-dev",
"database": "sqlite",
"users": 12,
"admins": 1,
"deactivated": 0,
"devices": 19,
"rooms": 4,
"published_rooms": 1,
"events": 312,
"federation_enabled": false,
"registration_enabled": false
}
The three room counters are zero on a server that started without a signing key, which has no roomserver and so no rooms.
Errors
The same envelope as the Client-Server API — {"errcode": ..., "error": ...} — so the panel needs one error path, not two. 409 M_FORBIDDEN is
specific to this API: the request was well formed and the server's own
configuration is what refuses it.
Not here yet
Phase 9 completes the admin API: deactivating users, resetting passwords, revoking devices, granting the admin flag, registration token management, the federation allow/deny list editor, server notices, media quotas and an audit log of admin actions.
The room endpoints will grow with it: a room's state and its recent events for an operator looking at a report, and a way to publish or withdraw a room from the directory without borrowing a member's token.
A server started without a signing key has no roomserver, and the four room
endpoints then answer 503 rather than failing on the first call.