Halit Aksoy
29fa443b93
- postgres replaces keycloak-db and holds a keycloak and a mancala database, each with its own user, created by apps/postgres/init - valkey with an append-only file for live game state and caches - backend gets DATABASE_URL and VALKEY_URL
68 lines
2.7 KiB
Markdown
68 lines
2.7 KiB
Markdown
# Mancala Keycloak
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Keycloak is the only auth system for Mancala. Players can either log in with an account or play as a guest,
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and both come back as normal Keycloak tokens from the `mancala` realm.
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## Guest login
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`extension/` adds a `mancala-guest-authenticator` to Keycloak. When an authorization request has `guest=true`,
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it creates a new user named `guest-xxxxxxxx`, gives it the `guest` realm role and logs it in without showing a
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form. Requests without the parameter fall through to the normal login form.
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```
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/realms/mancala/protocol/openid-connect/auth?client_id=mancala-web&response_type=code
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&scope=openid%20offline_access&redirect_uri=...&code_challenge=...&code_challenge_method=S256
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&guest=true
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```
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- Clients can tell guests apart by `"guest"` in the access token's `realm_access.roles`.
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- Guests should request `offline_access` so they keep their identity after the SSO session ends
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(offline sessions expire after 30 days without use).
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- A scheduled task deletes guests that are older than a day and have no session or offline session left.
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Its timing can be changed with server options such as
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`KC_SPI_AUTHENTICATOR__MANCALA_GUEST_AUTHENTICATOR__CLEANUP_INTERVAL_SECONDS` (default 3600),
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`..._CLEANUP_MIN_AGE_SECONDS` (default 86400) and `..._CLEANUP_MAX_DELETES_PER_RUN` (default 1000).
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- Each guest login creates a user, so the auth endpoint is rate limited per IP in `config/nginx.conf`.
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## Realm
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`realm/mancala-realm.json` holds the realm: the `mancala-web` public client (PKCE S256), the
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`browser with guest` flow, the `guest` role, and the required actions with "Verify Profile" turned off so guests
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are not asked for an email or a name.
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Keycloak imports the file only if the realm does not exist yet. After changing it, apply the change in the admin
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console too, or delete the realm and restart Keycloak.
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## Running
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```sh
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cd apps
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cat > .env <<EOF
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POSTGRES_PASSWORD=change-me
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KEYCLOAK_DB_PASSWORD=change-me
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KEYCLOAK_ADMIN_PASSWORD=change-me
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MANCALA_DB_PASSWORD=change-me
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EOF
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docker compose up -d --build keycloak
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```
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Keycloak uses the `keycloak` database of the shared `postgres` service; `apps/postgres/init` creates it the first time
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the Postgres volume is initialised.
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Keycloak is then at http://localhost:8080 and the admin console at http://localhost:8080/admin.
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In production set `KEYCLOAK_HOSTNAME=https://auth.playmancala.app`; nginx proxies that host to port 8080.
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## Tests
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```sh
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cd apps/keycloak/extension
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mvn test
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```
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The tests start Keycloak with the extension and the real realm file in a container, so they need Docker.
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## Upgrading Keycloak
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The extension uses Keycloak's authenticator SPI, which Keycloak marks as internal. When upgrading, change the
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version in `extension/pom.xml` and in `Dockerfile` together and run the tests.
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