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refactor: extract getOAuthMetadata() shared by both discovery endpoints

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Both /.well-known/oauth-authorization-server (via SDK router) and
/.well-known/openid-configuration now serve the same OAuthMetadata
object built once from a shared lazy getter.

The MCP spec explicitly states clients try OIDC Discovery or RFC 8414
depending on server support — ChatGPT uses OIDC Discovery first.
Serving the OAuth AS metadata at the OIDC URL is the correct approach;
clients only read the OAuth fields (authorization_endpoint,
token_endpoint, registration_endpoint) from it.
This commit is contained in:
jubnl
2026-05-05 14:32:59 +02:00
parent f9db7e1104
commit 895f34deba
1 changed files with 16 additions and 20 deletions
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server/src/app.ts
+16 -20
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@@ -379,11 +379,13 @@ export function createApp(): express.Application {
// mcpAuthMetadataRouter serves:
// /.well-known/oauth-authorization-server — RFC 8414 AS metadata
// /.well-known/oauth-protected-resource/mcp — RFC 9728 path-based PRM (fixes issue #959 bug 1)
let _oauthMetadata: OAuthMetadata | null = null;
let _sdkMetaRouter: express.Router | null = null;
function getMetaRouter(): express.Router {
if (_sdkMetaRouter) return _sdkMetaRouter;
function getOAuthMetadata(): OAuthMetadata {
if (_oauthMetadata) return _oauthMetadata;
const base = (getAppUrl() || 'http://localhost:3001').replace(/\/+$/, '');
const oauthMetadata: OAuthMetadata = {
_oauthMetadata = {
issuer: base,
authorization_endpoint: `${base}/oauth/authorize`,
token_endpoint: `${base}/oauth/token`,
@@ -395,9 +397,15 @@ export function createApp(): express.Application {
token_endpoint_auth_methods_supported: ['client_secret_post', 'none'],
scopes_supported: ALL_SCOPES,
};
return _oauthMetadata;
}
function getMetaRouter(): express.Router {
if (_sdkMetaRouter) return _sdkMetaRouter;
const metadata = getOAuthMetadata();
_sdkMetaRouter = mcpAuthMetadataRouter({
oauthMetadata,
resourceServerUrl: new URL(`${base}/mcp`),
oauthMetadata: metadata,
resourceServerUrl: new URL(`${metadata.issuer}/mcp`),
scopesSupported: ALL_SCOPES as string[],
resourceName: 'TREK MCP',
});
@@ -416,22 +424,10 @@ export function createApp(): express.Application {
});
// ChatGPT (and other OIDC-first clients) bootstrap OAuth discovery via
// /.well-known/openid-configuration. Serve the same AS metadata there so
// they can find the registration_endpoint, authorization_endpoint, etc.
// /.well-known/openid-configuration. Serve the same typed AS metadata so
// they can find registration_endpoint, authorization_endpoint, token_endpoint.
app.get('/.well-known/openid-configuration', (_req: Request, res: Response) => {
const base = (getAppUrl() || 'http://localhost:3001').replace(/\/+$/, '');
res.json({
issuer: base,
authorization_endpoint: `${base}/oauth/authorize`,
token_endpoint: `${base}/oauth/token`,
revocation_endpoint: `${base}/oauth/revoke`,
registration_endpoint: `${base}/oauth/register`,
response_types_supported: ['code'],
grant_types_supported: ['authorization_code', 'refresh_token'],
code_challenge_methods_supported: ['S256'],
token_endpoint_auth_methods_supported: ['client_secret_post', 'none'],
scopes_supported: ALL_SCOPES,
});
res.json(getOAuthMetadata());
});
// SDK authorize handler: validates OAuth params, calls provider.authorize() which redirects