Fix the default auth config processing

Author: gkrajniaksap

src/portal-options/auth-config-provider.spec.ts

@@ -29,7 +29,7 @@ describe('PMAuthConfigProvider', () => {
   it('should delegate to EnvAuthConfigService if available', async () => {
     const req = { hostname: 'foo.example.com' } as Request;
     const expected = {
-      idpName: 'idp',
+      idpName: 'foo',
       baseDomain: 'example.com',
       oauthServerUrl: 'url',
       oauthTokenUrl: 'token',

src/portal-options/auth-config-provider.ts

@@ -18,7 +18,15 @@ export class PMAuthConfigProvider implements AuthConfigService {
 
   async getAuthConfig(request: Request): Promise<ServerAuthVariables> {
     try {
-      return await this.envEuthConfigService.getAuthConfig(request);
+      const authConfig = await this.envEuthConfigService.getAuthConfig(request);
+      const subDomain = request.hostname.split('.')[0];
+      return {
+        ...authConfig,
+        idpName:
+          request.hostname === authConfig.baseDomain
+            ? authConfig.idpName
+            : subDomain,
+      };
     } catch {
       this.logger.debug(
         'Failed to retrieve auth config from environment variables based on provided IDP.',