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* GitLab accounts a chat can work with, and the one it uses.
*
* With OAuth a connection signs in with one account and can link more accounts to its
* session, on the same or other instances, each with its own tokens. With a static token
* the server's own token is the first account, and each configured instance that names a
* token variable is another. A chat (an MCP session; stdio is one chat) uses the first
* account until it switches; other chats keep their own choice.
*/
import { GITLAB_BASE_URL, GITLAB_TOKEN } from '../config';
import { runWithTokenAccount } from './token-account';
import { configuredInstanceToken } from './instance-tokens';
import { InstanceRegistry } from '../services/InstanceRegistry';
import { isOAuthEnabled, loadOAuthConfig } from '../oauth/config';
import type { OAuthConfig } from '../oauth/config';
import { sessionStore } from '../oauth/session-store';
import { getTokenContext, runWithTokenContext } from '../oauth/token-context';
import { GitLabGrantRevokedError, withFreshGitLabToken } from '../oauth/gitlab-token-refresh';
import { liveGitLabAccessToken, revokeGitLabGrant } from '../oauth/grant-revocation';
import type { OAuthSession, TokenContext } from '../oauth/types';
import { accountProfileId } from '../entities/context/profile';
import { normalizeInstanceUrl } from '../utils/url';
/** An account as a chat sees it; never carries a credential. */
export interface ChatAccount {
/** Opaque, stable id the chat names the account by. */
id: string;
/** Username and instance, e.g. "alice @ Corporate GitLab". */
label: string;
instanceUrl: string;
username?: string;
/** The account the connection signed in with, or the server's own token. */
primary: boolean;
/** The account this chat works with now. */
active: boolean;
}
/** A configured instance a static-token chat can work with. */
interface TokenAccount {
id: string;
instanceUrl: string;
label: string;
token: string;
}
/** The chosen account cannot be used; the message says what to do. */
export class AccountUnavailableError extends Error {
constructor(message: string) {
super(message);
this.name = 'AccountUnavailableError';
}
}
/** Chat key of a request without an MCP session id (the stdio transport). */
const SESSIONLESS = 'stdio';
/**
* Chat key -> id of the account it switched to; absent: the first account.
*
* Held in process like the chat's other overrides: the key is the MCP session id, and a
* request carrying an id this process no longer serves (restart, idle eviction, another
* replica) is answered 404 before it reaches a handler, so the client opens a new session
* under a new id. Persisting the choice would serve no session: under the MCP session id
* nothing reads it again, and under the OAuth session it would leak into every other chat.
*/
const selections = new Map<string, string>();
/** Passes over a linked account before an unlink gives up and asks for a retry. */
const UNLINK_ATTEMPTS = 20;
/** Wait between passes while a link or a token refresh holds the account's lease. */
const UNLINK_RETRY_MS = 100;
/** How long an unlink holds the account: a delete. */
const UNLINK_LEASE_MS = 15_000;
function chatKey(sessionId: string | undefined): string {
return sessionId ?? SESSIONLESS;
}
function instanceName(instanceUrl: string, label: string | undefined): string {
if (label) return label;
try {
return new URL(instanceUrl).host;
} catch {
return instanceUrl;
}
}
function sessionInstance(session: OAuthSession): string {
return normalizeInstanceUrl(session.gitlabApiUrl ?? GITLAB_BASE_URL);
}
function oauthAccountId(session: OAuthSession): string {
return accountProfileId(sessionInstance(session), session.gitlabUserId);
}
function oauthAccount(session: OAuthSession, primary: boolean, activeId: string): ChatAccount {
const instanceUrl = sessionInstance(session);
const id = oauthAccountId(session);
return {
id,
label: `${session.gitlabUsername} @ ${instanceName(instanceUrl, session.instanceLabel)}`,
instanceUrl,
username: session.gitlabUsername,
primary,
active: id === activeId,
};
}
/** The signed-in session of the current request, with OAuth. */
async function signedInSession(): Promise<OAuthSession> {
const context = getTokenContext();
const session = context ? await sessionStore.getSession(context.sessionId) : undefined;
if (!session) {
throw new AccountUnavailableError('This connection is not signed in to GitLab.');
}
return session;
}
/**
* The server's own token first, then each configured instance with a token variable
* that is set. An instance whose variable is unset is left out: it has no token to use.
*/
function tokenAccounts(): TokenAccount[] {
const primaryUrl = normalizeInstanceUrl(GITLAB_BASE_URL);
const registry = InstanceRegistry.getInstance();
const accounts: TokenAccount[] = [];
Eif (GITLAB_TOKEN) {
const primaryLabel = registry.isInitialized()
? registry.getConfig(primaryUrl)?.label
: undefined;
accounts.push({
id: primaryUrl,
instanceUrl: primaryUrl,
label: instanceName(primaryUrl, primaryLabel),
token: GITLAB_TOKEN,
});
}
if (!registry.isInitialized()) return accounts;
for (const url of registry.getUrls()) {
const config = registry.getConfig(url);
const instanceUrl = normalizeInstanceUrl(url);
const token = configuredInstanceToken(instanceUrl);
if (!token || accounts.some((account) => account.instanceUrl === instanceUrl)) continue;
accounts.push({
id: instanceUrl,
instanceUrl,
label: instanceName(instanceUrl, config?.label),
token,
});
}
return accounts;
}
/** The accounts the chat can work with, the one it uses marked active. */
export async function listChatAccounts(sessionId: string | undefined): Promise<ChatAccount[]> {
const selected = selections.get(chatKey(sessionId));
if (isOAuthEnabled()) {
const session = await signedInSession();
const activeId = selected ?? oauthAccountId(session);
const linked = sessionStore.linksAccounts()
? await sessionStore.getLinkedSessions(session.id)
: [];
return [
oauthAccount(session, true, activeId),
...linked.map((row) => oauthAccount(row, false, activeId)),
];
}
const accounts = tokenAccounts();
const activeId = selected ?? accounts[0]?.id;
return accounts.map((account, index) => ({
id: account.id,
label: account.label,
instanceUrl: account.instanceUrl,
primary: index === 0,
active: account.id === activeId,
}));
}
/** Make `accountId` the account the chat works with; returns it. */
export async function switchChatAccount(
sessionId: string | undefined,
accountId: string,
): Promise<ChatAccount> {
const accounts = await listChatAccounts(sessionId);
const account = accounts.find((candidate) => candidate.id === accountId);
if (!account) {
throw new AccountUnavailableError(
`No account "${accountId}" in this connection; list them with manage_context list_accounts.`,
);
}
if (account.primary) selections.delete(chatKey(sessionId));
else selections.set(chatKey(sessionId), account.id);
return { ...account, active: true };
}
/**
* Remove a linked account from the connection's session and end its GitLab grant. The
* account this chat works with now, and the one the connection signed in with, are
* refused; another chat that switched to the removed account is refused on its next call.
*/
export async function unlinkChatAccount(
sessionId: string | undefined,
accountId: string,
): Promise<ChatAccount> {
const config = loadOAuthConfig();
if (!isOAuthEnabled() || !config) {
throw new AccountUnavailableError(
'A server with a static token has no linked accounts; its instances are configured.',
);
}
if (!sessionStore.linksAccounts()) {
throw new AccountUnavailableError(
'The session storage of this server cannot keep linked accounts; update the database package.',
);
}
const session = await signedInSession();
const linked = await sessionStore.getLinkedSessions(session.id);
const row = linked.find((candidate) => oauthAccountId(candidate) === accountId);
if (!row) {
throw new AccountUnavailableError(
`No linked account "${accountId}"; the account this connection signed in with cannot be unlinked.`,
);
}
if (selections.get(chatKey(sessionId)) === accountId) {
throw new AccountUnavailableError(
'This chat works with that account now; switch to another account first.',
);
}
const accessToken = await removeLinkedRow(row.id, config);
if (accessToken) await revokeGitLabGrant(row, accessToken, config);
return oauthAccount(row, false, '');
}
/**
* Remove a linked account's row under the lease a link replacing its grant (and a token
* refresh) holds, so the grant removed is the one this returns: its live access token, or
* undefined when the row is already gone. A link that comes after stores the account again.
*/
async function removeLinkedRow(
rowId: string,
config: OAuthConfig,
attempt = 1,
): Promise<string | undefined> {
const stored = await sessionStore.getSession(rowId);
if (!stored) return undefined;
const accessToken = await liveGitLabAccessToken(stored, config);
const current = await sessionStore.getSession(rowId);
if (!current) return undefined;
// The row holds the token just made live (or kept, when the refresh failed) unless a link
// replaced the grant meanwhile; then the next pass reads the new one.
if (current.gitlabAccessToken === accessToken) {
const now = Date.now();
const leaseUntil = now + UNLINK_LEASE_MS;
// The claim holds only while the row keeps this refresh token, i.e. this very grant.
const refreshToken = current.gitlabRefreshToken;
if (await sessionStore.claimGitLabRefresh(rowId, refreshToken, now, leaseUntil)) {
try {
await sessionStore.deleteSession(rowId);
return accessToken;
} finally {
await sessionStore.releaseGitLabRefresh(rowId, leaseUntil).catch(() => undefined);
}
}
}
if (attempt >= UNLINK_ATTEMPTS) {
throw new AccountUnavailableError(
'The account is being changed elsewhere (a sign-in or a token refresh); try again.',
);
}
await new Promise((resolve) => setTimeout(resolve, UNLINK_RETRY_MS));
return removeLinkedRow(rowId, config, attempt + 1);
}
/** Forget a closed chat's choice. */
export function forgetChat(sessionId: string): void {
selections.delete(sessionId);
}
/** Token context of a linked account, its GitLab tokens fresh. */
async function linkedAccountContext(
context: TokenContext,
accountId: string,
): Promise<TokenContext> {
const config = loadOAuthConfig();
const row = (await sessionStore.getLinkedSessions(context.sessionId)).find(
(candidate) => oauthAccountId(candidate) === accountId,
);
if (!row || !config) {
throw new AccountUnavailableError(
'The account this chat switched to is no longer linked; switch to another account or link it again.',
);
}
let fresh: OAuthSession | undefined;
try {
fresh = await withFreshGitLabToken(row, config);
} catch (error) {
if (error instanceof GitLabGrantRevokedError) {
throw new AccountUnavailableError(
`GitLab no longer accepts the sign-in of ${row.gitlabUsername}; link the account again with manage_context link_account.`,
);
}
// A GitLab or storage outage: the account stays linked, the call can be retried.
const reason = error instanceof Error ? error.message : String(error);
throw new AccountUnavailableError(
`The sign-in of ${row.gitlabUsername} could not be refreshed now (${reason}); try again.`,
);
}
if (!fresh) {
throw new AccountUnavailableError(
'The account this chat switched to is no longer linked; switch to another account or link it again.',
);
}
return {
...context,
gitlabToken: fresh.gitlabAccessToken,
gitlabUserId: fresh.gitlabUserId,
gitlabUsername: fresh.gitlabUsername,
gitlabScopes: fresh.gitlabScopes,
apiUrl: sessionInstance(fresh),
instanceLabel: fresh.instanceLabel,
};
}
/**
* Run `fn` as the account the chat works with: the request's own account unless the chat
* switched. A switched-to account that cannot be used refuses the call; it never falls
* back to another account.
*/
export async function withChatAccount<T>(
sessionId: string | undefined,
fn: () => Promise<T>,
): Promise<T> {
const selected = selections.get(chatKey(sessionId));
if (!selected) return fn();
if (isOAuthEnabled()) {
const context = getTokenContext();
if (!context) return fn();
if (selected === accountProfileId(normalizeInstanceUrl(context.apiUrl), context.gitlabUserId)) {
return fn();
}
const accountContext = await linkedAccountContext(context, selected);
return runWithTokenContext(accountContext, fn);
}
const account = tokenAccounts().find((candidate) => candidate.id === selected);
if (!account) {
throw new AccountUnavailableError(
'The instance this chat switched to is no longer configured with a token; switch to another account.',
);
}
return runWithTokenAccount({ instanceUrl: account.instanceUrl, token: account.token }, fn);
}
/** Clear every chat's choice (tests). */
export function resetChatAccounts(): void {
selections.clear();
}
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