Switch OIDC primarily to new /auth_metadata API (#29019)

* Switch OIDC primarily to new `/auth_metadata` API

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update tests

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Simplify the world

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/utils/AutoDiscoveryUtils.tsx

@@ -11,7 +11,6 @@ import {
     AutoDiscovery,
     AutoDiscoveryError,
     ClientConfig,
-    discoverAndValidateOIDCIssuerWellKnown,
     IClientWellKnown,
     MatrixClient,
     MatrixError,
@@ -293,8 +292,7 @@ export default class AutoDiscoveryUtils {
         let delegatedAuthenticationError: Error | undefined;
         try {
             const tempClient = new MatrixClient({ baseUrl: preferredHomeserverUrl });
-            const { issuer } = await tempClient.getAuthIssuer();
-            delegatedAuthentication = await discoverAndValidateOIDCIssuerWellKnown(issuer);
+            delegatedAuthentication = await tempClient.getAuthMetadata();
         } catch (e) {
             if (e instanceof MatrixError && e.httpStatus === 404 && e.errcode === "M_UNRECOGNIZED") {
                 // 404 M_UNRECOGNIZED means the server does not support OIDC

src/utils/oidc/authorize.ts

@@ -39,7 +39,7 @@ export const startOidcLogin = async (
     const prompt = isRegistration ? "create" : undefined;
 
     const authorizationUrl = await generateOidcAuthorizationUrl({
-        metadata: delegatedAuthConfig.metadata,
+        metadata: delegatedAuthConfig,
         redirectUri,
         clientId,
         homeserverUrl,

src/utils/oidc/isUserRegistrationSupported.ts

@@ -15,8 +15,6 @@ import { OidcClientConfig } from "matrix-js-sdk/src/matrix";
  * @returns whether user registration is supported
  */
 export const isUserRegistrationSupported = (delegatedAuthConfig: OidcClientConfig): boolean => {
-    // The OidcMetadata type from oidc-client-ts does not include `prompt_values_supported`
-    // even though it is part of the OIDC spec, so cheat TS here to access it
-    const supportedPrompts = (delegatedAuthConfig.metadata as Record<string, unknown>)["prompt_values_supported"];
+    const supportedPrompts = delegatedAuthConfig.prompt_values_supported;
     return Array.isArray(supportedPrompts) && supportedPrompts?.includes("create");
 };

src/utils/oidc/registerClient.ts

@@ -40,9 +40,9 @@ export const getOidcClientId = async (
     delegatedAuthConfig: OidcClientConfig,
     staticOidcClients?: IConfigOptions["oidc_static_clients"],
 ): Promise<string> => {
-    const staticClientId = getStaticOidcClientId(delegatedAuthConfig.metadata.issuer, staticOidcClients);
+    const staticClientId = getStaticOidcClientId(delegatedAuthConfig.issuer, staticOidcClients);
     if (staticClientId) {
-        logger.debug(`Using static clientId for issuer ${delegatedAuthConfig.metadata.issuer}`);
+        logger.debug(`Using static clientId for issuer ${delegatedAuthConfig.issuer}`);
         return staticClientId;
     }
     return await registerOidcClient(delegatedAuthConfig, await PlatformPeg.get()!.getOidcClientMetadata());