Warp/README.md

# Warp

A [Matrix](https://spec.matrix.org) homeserver written from scratch in Go,
plus a family of first-party clients. Federation is optional and can be
switched on and off at runtime.

The full design and roadmap live in [PLAN.md](PLAN.md). This README covers
what exists today.

## Status

**Phase 6 — media. Complete.** Clients can upload files, reserve an
`mxc://` URI and upload to it later, download and ask for thumbnails, all
through the authenticated media endpoints of Matrix 1.11. Content is
stored once per distinct file, named by its SHA-256, on the local
filesystem; thumbnails are made on first request from a fixed set of
sizes, the right way up for a phone's photos, with the pixel count checked
before anything is decoded. Media from other servers is fetched over
federation on first use — with the fallback older servers need, and
redirects that cannot be pointed into a private network — and cached, so
it is still there with federation switched off. Every download carries the
headers that keep an uploaded file from running as a page on the
homeserver's origin. Known gaps — no URL previews, no deletion or quotas
until Phase 9 — are listed in [docs/media.md](docs/media.md).

**Phase 5 — federation. Complete.** Warp talks to other homeservers. It
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 gone), and exchanges events, typing,
read receipts and to-device messages with them. Events from elsewhere go
through the spec's full intake — signatures and hashes, the rules against
their own auth events, against the state before them and against the
current state, with missing history fetched and soft failure for what
fails only at the end — and forked rooms are resolved back together. The
outbound queue persists what it owes each server, retries with backoff,
and survives restarts. Server discovery, key fetching with an optional
notary, X-Matrix request signing, server ACLs, and a TLS listener for port
8448. The switch is real now: turning federation off stops the queue and
refuses every outbound request, turning it back on resumes from where it
stopped, and the admin API shows each server's queue and backoff. Known
gaps — no history backfill from other servers, no partial-state joins, no
key rotation — are listed in [docs/federation.md](docs/federation.md).

**Phase 4 — sync. Complete. Milestone M1.** Warp is now a homeserver a
client can be used against. `/sync` is real: stream tokens across five
independent streams, long polling that wakes the moment something concerns
the client rather than when its timeout expires, incremental deltas, gappy
timelines with a `prev_batch` to close them, filters, and lazy-loaded
members. `/messages` pages a room's history and `/context` opens a
permalink. The streams that are not room events are here too: typing,
read receipts and read markers, to-device messaging for Phase 7's
encryption to build on, and presence behind a config switch that is off by
default. A user who has left a room is now served the room as it was when
they left rather than refused, and `?at=` on `/members` is honoured. See
[docs/sync.md](docs/sync.md).

**Phase 3 — rooms, local only. Complete.** A client can create a room at any
supported version, invite, join, leave, kick, ban, send messages and state,
redact, name a room with an alias and find one in the public directory. Every
event goes through one pipeline — validate, authorise, resolve, persist,
emit — so a membership change made by `createRoom`, by `/invite` or by a raw
`PUT .../state/m.room.member` is judged by the same authorisation rules.
Nothing talks to another server yet, and every operation that would need to
is refused with a message that says so. See
[docs/rooms.md](docs/rooms.md).

**Phase 2 — the event core. Complete.** The library every later phase is
built on: canonical JSON, the event model with its hashes and identifiers,
the redaction algorithm, event signing, the room version registry, the
authorisation rules and state resolution v2. Pure library code under
`server/internal/matrix`, verified against the spec's own test vectors.
See [docs/event-core.md](docs/event-core.md).

**Phase 1 — accounts and sessions. Complete.** A client can register, log
in, manage its devices and set its profile.

Client-Server API:

| | |
|---|---|
| `POST /register`, `GET /register/available` | sign-up, with `m.login.dummy` and optional registration tokens |
| `GET`, `POST /login` · `POST /logout`, `/logout/all` · `POST /refresh` | sessions, with `m.login.password` and refresh tokens |
| `GET /account/whoami` · `GET /capabilities` | who am I, and what this build can do |
| `GET /devices`, `GET`/`PUT`/`DELETE /devices/{id}` · `POST /delete_devices` | device management; deletion re-asks for the password |
| `GET /profile/{user}` and its `displayname` / `avatar_url` sub-resources | profiles — reads are public, remote ones asked of their server, writes are your own |
| `GET`/`PUT /user/{user}/account_data/{type}` and the per-room variant | account data, stored and returned byte for byte |
| `POST /createRoom` | room versions 3 to 12, presets, `initial_state`, invites, aliases |
| `POST /join/{roomIdOrAlias}` · `POST /rooms/{id}/join`, `/leave` | joining by ID or alias — on another server too, with federation on — and leaving or rejecting an invite |
| `POST /rooms/{id}/invite`, `/kick`, `/ban`, `/unban` | membership, decided by the room's power levels; invites reach users of other servers |
| `PUT /rooms/{id}/send/{type}/{txn}` | messages, idempotent per transaction ID |
| `GET`/`PUT /rooms/{id}/state[/{type}[/{key}]]` | room state, read whole or one piece at a time |
| `PUT /rooms/{id}/redact/{event}/{txn}` | redactions, applied only when they take effect |
| `GET /rooms/{id}/event/{event}` · `/members` (with `?at=`) · `/joined_members` · `/aliases` | reading a room |
| `GET /joined_rooms` | the rooms you are in |
| `GET`/`PUT`/`DELETE /directory/room/{alias}` | the alias directory; remote aliases are asked of their server |
| `GET`/`POST /publicRooms` · `GET`/`PUT /directory/list/room/{id}` | the public room directory, ours or (`?server=`) another server's |
| `GET /sync` | the event stream: long-polled, incremental, filtered, with lazy-loaded members |
| `GET /rooms/{id}/messages` · `/context/{event}` | paging a room's history, and one event with what surrounds it |
| `POST /user/{user}/filter` · `GET /user/{user}/filter/{id}` | filters, stored and returned byte for byte |
| `PUT /rooms/{id}/typing/{user}` | typing notifications, kept in memory and expired |
| `POST /rooms/{id}/receipt/{type}/{event}` · `/read_markers` | read receipts, public and private, and the read marker |
| `PUT /sendToDevice/{type}/{txn}` | device-to-device messaging, for E2EE in Phase 7 |
| `GET`/`PUT /presence/{user}/status` | presence — **only while `sync.presence` is on**, and it is off by default |
| `POST /_matrix/media/v3/upload` · `POST /_matrix/media/v1/create` · `PUT /_matrix/media/v3/upload/{server}/{id}` | uploads, directly or to a reserved URI |
| `GET /_matrix/client/v1/media/download/…` · `/thumbnail/…` · `/config` | downloads and thumbnails, local and from other servers; see [docs/media.md](docs/media.md) |
| `GET /_matrix/client/versions` · `/.well-known/matrix/client` | discovery |
| `/.well-known/matrix/server` | server discovery — **only while federation is on** |
| `/_matrix/federation/*` · `/_matrix/key/*` | the Server-Server API — **only while federation is on**; see [docs/federation.md](docs/federation.md) |
| `GET /healthz` · `GET /metrics` | liveness with a database ping, and Prometheus |
| anything else under `/_matrix/` | `404 M_UNRECOGNIZED`, as the spec requires |

Admin API under `/_warp/admin/v1`: the federation and registration
switches, per-server federation health, user listing and creation, the
room list and detail, purging a room, removing a user from one, and the
dashboard counters. See
[docs/admin-api.md](docs/admin-api.md).

Also in place: argon2id passwords, hashed access and refresh tokens,
per-endpoint rate limiting, YAML + environment configuration, structured
logging, graceful shutdown, the storage interfaces with a working SQLite and
PostgreSQL driver (and a PocketBase stub), the embedded migration runner and
the runtime settings service.

Complement, the official integration suite, is wired up for both
profiles. `make complement` runs the account, room and stream tests with
federation off — `TestRegistration`, `TestLogin`, `TestDeviceManagement`,
the Phase 3 room tests and the Phase 4 `TestSync*`, `TestMessages*`,
`TestContext*`, `TestFilter*`, `TestTyping*`, `TestReceipt*` and
`TestToDevice*`, and the Phase 6 media tests. `make complement-federation`
runs the Phase 5 Server-Server tests with federation on, over TLS with
Complement's CA.

## Quick start

Requires Go 1.26 or newer. No cgo, no C compiler, no database server: the
default SQLite driver is pure Go.

```sh
cp warp.yaml.example warp.yaml
# edit global.server_name

make build
./bin/warp generate-keys
./bin/warp create-account --username you --admin
./bin/warp serve
```

Then:

```sh
curl localhost:8008/healthz
curl localhost:8008/_matrix/client/versions
```

Registration is off in a fresh install, which is why the first account is
made from the command line. Turn it on from the admin API when you want
others to sign up.

Without `make`, the same from the `server` directory:

```sh
go build -o ../bin/warp ./cmd/warp
```

## Configuration

One YAML file, every field overridable from the environment. See
[warp.yaml.example](warp.yaml.example) — each setting lists its `WARP_*`
variable. With no config file at all the server runs on defaults plus the
environment, which is how the container image is meant to be used:

```sh
docker build -t warp .
docker run -p 8008:8008 -v warp-data:/data -e WARP_SERVER_NAME=warp.example warp
```

An unknown field in the config file is an error, not a warning: a typo in a
security-relevant setting should never be silently ignored.

## Commands

| Command | What it does |
|---|---|
| `warp serve` | run the homeserver |
| `warp migrate [--status]` | apply (or list) pending database migrations |
| `warp generate-keys [--output path] [--key-id id]` | create the ed25519 signing key |
| `warp create-account --username name [--admin]` | create a local account, straight in the database |
| `warp version` | version and compiled-in storage drivers |

`create-account` talks to the database rather than to a running server, so
the first account on a new install can be made before anything is listening
and without turning registration on. It prompts for the password twice;
`--password-file` and `--password` are there for scripts.

The signing key is written as a single line, the same format Synapse uses:
`ed25519 <key-id> <unpadded-base64-seed>`. `generate-keys` refuses to
overwrite an existing key — losing it would invalidate every event this
server has ever signed.

## Federation switch

Federation is off in a fresh install. While it is off, the federation
surface does not answer at all: `/_matrix/federation/*`, `/_matrix/key/*`
and `/.well-known/matrix/server` return `404 M_UNRECOGNIZED`, exactly as
they would on a server that has no federation API, and nothing outbound
runs.

The switch is stored in the `server_settings` table and cached in memory,
so flipping it — `PUT /_warp/admin/v1/federation {"enabled": true}` —
takes effect on the next request without a restart. Switching it on
starts the outbound queue, which picks up whatever it still owed other
servers; switching it off stops the queue mid-flight and makes the
federation client refuse every request before it opens a connection. Set
`federation.allow_runtime_toggle: false` to pin the switch to the config
file.

To federate, other servers have to be able to reach this one: either set
`global.well_known.server_address` to a reverse proxy that terminates TLS,
or let Warp terminate it with `listen.federation_address: ":8448"` and a
certificate. See [docs/configuration.md](docs/configuration.md) and
[docs/federation.md](docs/federation.md).

## Development

```sh
make test          # unit tests (SQLite)
make lint          # golangci-lint
make check         # vet + test, what CI runs
make cover         # coverage.html
make complement    # the Complement C-S subset, federation off (needs Docker)
make complement-federation  # the Complement federation subset

# the storage tests against PostgreSQL as well
WARP_TEST_POSTGRES_DSN='postgres://warp:warp@localhost/warp_test?sslmode=disable' make test-postgres
```

`make test-race` needs cgo and therefore a C toolchain; CI runs it on
Linux.

## Layout

```
server/                 the homeserver (Go module)
  cmd/warp/             the binary: serve, migrate, generate-keys, create-account, version
  internal/
    config/             YAML + env configuration
    logging/  metrics/  slog and Prometheus setup
    httputil/           Matrix error envelope, CORS, router, middleware
    ratelimit/          per-endpoint token buckets
    federation/         the Server-Server protocol: gate, X-Matrix, discovery, client, keys
    federationapi/      federation endpoints, the outbound queue, the switchable Module (docs/federation.md)
    settings/           runtime settings service (the switches)
    userapi/            accounts, passwords, devices, tokens, account data
    roomserver/         rooms: the input pipeline (docs/rooms.md)
    mediaapi/           uploads, downloads, thumbnails, remote media (docs/media.md)
    clientapi/          the Client-Server API handlers
    adminapi/           /_warp/admin/v1
    setup/              wiring: storage, routes, graceful shutdown
    matrix/             the event core (docs/event-core.md)
      canonicaljson/    the canonical JSON encoding
      signing/          ed25519 server keys, Signing JSON
      id/               identifier grammars as they appear in events
      roomversion/      the room version registry
      event/            PDUs: hashes, event IDs, redaction, signing
      auth/             the authorisation rules and power levels
      stateres/         state resolution v2
    storage/            interfaces + driver registry
      migrations/       embedded migration runner
      sqlstore/         shared database/sql implementation
      filestore/        media content on the local filesystem
      sqlite/ postgres/ pocketbase/
  test/complement/      the Complement homeserver image and runner
apps/                   clients: ui, admin, web, desktop, mobile (Phase 1+)
docs/
```