Added connect api

Author: pktikkani

src/trpc/routers/microsoft.ts

@@ -1,10 +1,81 @@
 import { z } from 'zod';
-import { createTRPCRouter, protectedProcedure } from '../init.js';
+import { createTRPCRouter, protectedProcedure, publicProcedure } from '../init.js';
 import { db } from '../../lib/db/prisma.js';
 import { TRPCError } from '@trpc/server';
 import { PermissionsClient } from '../../lib/microsoft/permissions.js';
+import { getAppCredentials } from '../../lib/microsoft/token-manager.js';
 
 export const microsoftRouter = createTRPCRouter({
+  /**
+   * Check if API can connect to Microsoft using Client Credentials (env vars)
+   * This is for SPFx apps that use the API's app-only authentication
+   */
+  checkConnection: publicProcedure.query(async () => {
+    try {
+      const credentials = await getAppCredentials();
+
+      // Try to get a token using Client Credentials flow
+      const tokenEndpoint = `https://login.microsoftonline.com/${credentials.tenantId}/oauth2/v2.0/token`;
+
+      const response = await fetch(tokenEndpoint, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/x-www-form-urlencoded',
+        },
+        body: new URLSearchParams({
+          client_id: credentials.clientId,
+          client_secret: credentials.clientSecret,
+          grant_type: 'client_credentials',
+          scope: 'https://graph.microsoft.com/.default',
+        }),
+      });
+
+      if (!response.ok) {
+        const error = await response.text();
+        console.error('Microsoft connection check failed:', error);
+        return {
+          connected: false,
+          message: 'Failed to authenticate with Microsoft',
+          tenantId: credentials.tenantId,
+          tenantName: null,
+        };
+      }
+
+      // Try to get tenant info
+      const tokenData = await response.json() as { access_token: string };
+      let tenantName: string | null = null;
+
+      try {
+        const orgResponse = await fetch('https://graph.microsoft.com/v1.0/organization', {
+          headers: {
+            Authorization: `Bearer ${tokenData.access_token}`,
+          },
+        });
+        if (orgResponse.ok) {
+          const orgData = await orgResponse.json() as { value?: Array<{ displayName?: string }> };
+          tenantName = orgData.value?.[0]?.displayName || null;
+        }
+      } catch {
+        // Ignore errors getting tenant name
+      }
+
+      return {
+        connected: true,
+        message: 'Connected to Microsoft 365',
+        tenantId: credentials.tenantId,
+        tenantName,
+      };
+    } catch (error) {
+      console.error('Microsoft connection check error:', error);
+      return {
+        connected: false,
+        message: error instanceof Error ? error.message : 'Microsoft credentials not configured',
+        tenantId: null,
+        tenantName: null,
+      };
+    }
+  }),
+
   /**
    * Get Microsoft connection status
    */