other: added msgraphservice.isusermemberofsecuritygroup 🔧 [skip-ci]

server/services/msgraph/MSGraphService.ts

@@ -314,4 +314,29 @@ export class MSGraphService {
       throw new MSGraphError('getEvents', error.message)
     }
   }
+
+  /**
+   * Checks if a user is a member of a security group.
+   *
+   * @param groupId The ID of the security group.
+   * @param mail The email address of the user.
+   *
+   * @public
+   *
+   * @memberof MSGraphService
+   */
+  public async isUserMemberOfSecurityGroup(
+    groupId: string,
+    mail: string
+  ): Promise<boolean> {
+    try {
+      const client = await this._getClient()
+      const response = await (client
+        .api(`/groups/${groupId}/members?$select=id,mail`)
+        .get() as Promise<{ value: any[] }>)
+      return response.value.some((member) => member.mail === mail)
+    } catch {
+      return false
+    }
+  }
 }