fix: restore support for custom MS graph API url

relates to #16361

Signed-off-by: Heikki Hellgren <heikki.hellgren@op.fi>

.changeset/slow-suits-grab.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-backend-module-msgraph': patch
+---
+
+properly support custom graph api URL

plugins/catalog-backend-module-msgraph/src/microsoftGraph/client.test.ts

@@ -53,7 +53,7 @@ describe('MicrosoftGraphClient', () => {
     expect(await response.json()).toEqual({ value: 'example' });
     expect(tokenCredential.getToken).toHaveBeenCalledTimes(1);
     expect(tokenCredential.getToken).toHaveBeenCalledWith(
-      'https://graph.microsoft.com/.default',
+      'https://other.example.com/.default',
     );
   });
 

plugins/catalog-backend-module-msgraph/src/microsoftGraph/client.ts

@@ -218,8 +218,9 @@ export class MicrosoftGraphClient {
     headers?: Record<string, string>,
   ): Promise<Response> {
     // Make sure that we always have a valid access token (might be cached)
+    const urlObj = new URL(url);
     const token = await this.tokenCredential.getToken(
-      'https://graph.microsoft.com/.default',
+      `${urlObj.protocol}//${urlObj.hostname}/.default`,
     );
 
     if (!token) {