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v4: users sign in to one gerbeur instance with their account on another — topic instances, each with its own admins, domain and data, had no way to share accounts. Sign-in is federated over a subset of OpenID Connect, the authorization code flow with PKCE: each instance is an identity provider for its own users and a client for the others', and signs what it tells them with an Ed25519 key kept in federation_keys and published at /.well-known/jwks.json, beside its metadata at /.well-known/openid-configuration. Only sign-in is federated: an account from another instance is a local users row linked to (issuer, subject) in user_identities, with no password (password_hash ''), so sessions, roles, permissions, the socket and every foreign key work as before.

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A remote user is name@host here, in users.username, in paths (/@alice@music.example) and in mentions, through one handle rule in shared/validation.ts that paths, MENTION_RE and Markdown all build on; Markdown undoes GFM's email autolink of a handle. Their name, email and avatar come from their home at each sign-in and by its signed events (federation_outbox, delivered by the federation job with backoff): a rename at home leaves the old handle an alias here, and a password change or a withdrawn grant ends their sessions here. Their password, email, avatar and name can't change here (assertLocalUser), nor can they sign in elsewhere from here.

An admin keeps the trusted and blocked instances on /manage (federation:manage): a trusted instance's users sign in from a button on the login page, a blocked one's can't and are signed out at once, and any other's join with an invite from the register page. The /authorize page asks the user once per instance, and /settings lists the instances their account signs in to, each disconnectable; /login?next= brings a signed-out visitor back to /authorize. Emails stay unique among local accounts only, and migration 0024 adds the tables, makes that index partial and reserves authorize and federation as category slugs. remote/gerbeur-instance.ts is the only way to other instances: https and public addresses only, no redirects, no certificate fallback, unless GERBEUR_FEDERATION_ALLOW_PRIVATE lets two instances on one machine talk.

298 backend tests and 702 frontend tests pass, and deno check, deno fmt, deno lint, tsc, eslint, doc:lint and i18n:compile --strict are clean; checked end to end with two built instances on one machine: sign-in through the other's login and consent pages, consent skipped once granted and asked again after disconnecting, a rename and a password change at home reaching the other, and blocking; screenshots of the login, consent, profile, settings and manage pages at 1280 and 390px.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
khannurien
2026-10-09 14:23:00 +00:00
parent 2d26d0aada
commit c0d03e9aaa
67 changed files with 5261 additions and 339 deletions
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42
shared/validation.ts
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@@ -30,13 +30,51 @@ export const VALIDATION = {
/**
* Matches a valid username, made of letters, digits and underscores within the
* `VALIDATION` limits. Sign-up checks it on both sides. It uses the same `\w`
* that a mention's pattern reads a name with.
* `VALIDATION` limits. Sign-up and renaming check it on both sides. It uses the
* same `\w` that a handle's pattern ({@link HANDLE_SOURCE}) reads a name with;
* only a user from another instance has the `@host` part.
*/
export const USERNAME_RE: RegExp = new RegExp(
`^[a-zA-Z0-9_]{${VALIDATION.USERNAME_MIN},${VALIDATION.USERNAME_MAX}}$`,
);
/**
* The pattern of an instance's host as a handle writes it: DNS labels, and a
* port for instances on one machine (`localhost:8001`). It ends on a letter or
* a digit, so the period that ends a sentence after a mention isn't taken in.
* {@link HANDLE_SOURCE} builds on it.
*/
export const HOST_SOURCE: string =
"[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?)*(?::\\d{1,5})?";
/**
* The pattern of a handle, the name a user goes by on this instance: a local
* user's username, or `name@host` for a user whose account lives on another
* gerbeur (`federation-service.ts` stores it so in `users.username`). Paths,
* mentions and the profile links all read names by it, through
* {@link HANDLE_RE}, `MENTION_RE` (shared/mention.ts) and `parsePagePath`
* (shared/paths.ts).
*/
export const HANDLE_SOURCE: string = `\\w+(?:@${HOST_SOURCE})?`;
/** Matches a whole handle ({@link HANDLE_SOURCE}). */
export const HANDLE_RE: RegExp = new RegExp(`^${HANDLE_SOURCE}$`);
/** Matches a whole host ({@link HOST_SOURCE}). */
export const HOST_RE: RegExp = new RegExp(`^${HOST_SOURCE}$`);
/**
* Returns the name and, for a user from another instance, the host of
* `handle`. `splitHandle("alice@music.example")` is
* `{ name: "alice", host: "music.example" }`; a local name has no host.
*/
export function splitHandle(handle: string): { name: string; host?: string } {
const at = handle.indexOf("@");
return at < 0
? { name: handle }
: { name: handle.slice(0, at), host: handle.slice(at + 1) };
}
/**
* How often a dump's or a playlist's slug may change, counted from the aliases
* the changes left: 3 times a day. Moderators are exempt. slug-service refuses