Add support for handling chat join requests in Telegram bot

Author: abdulkarim1422

src/routes/telegram.ts

@@ -109,6 +109,43 @@ telegram.post('/webhook', async (c) => {
       return c.json({ ok: true });
     }
 
+    // Handle chat join requests
+    if (update.chat_join_request) {
+      const joinRequest = update.chat_join_request;
+      const telegramId = joinRequest.from.id;
+      const chatId = joinRequest.chat.id;
+      const username = joinRequest.from.username;
+      const firstName = joinRequest.from.first_name;
+      const lastName = joinRequest.from.last_name;
+      
+      console.log('Received chat join request:', {
+        chatId,
+        chatTitle: joinRequest.chat.title,
+        userId: telegramId,
+        username,
+        firstName,
+        lastName,
+        date: new Date(joinRequest.date * 1000).toISOString()
+      });
+      
+      // You can add your custom logic here to:
+      // 1. Automatically approve/decline the request
+      // 2. Check if user is in member sheets
+      // 3. Send notification to admins
+      // 4. Store the request for later processing
+      
+      // Example: Log the request (you can extend this with your own logic)
+      const telegramService = new TelegramService(c.env);
+      
+      // Optionally approve the request automatically
+      // await telegramService.approveChatJoinRequest(chatId, telegramId);
+      
+      // Optionally decline the request
+      // await telegramService.declineChatJoinRequest(chatId, telegramId);
+      
+      return c.json({ ok: true });
+    }
+    
     if (!update.message) {
       return c.json({ ok: true });
     }

src/services/telegram.ts

@@ -200,6 +200,11 @@ export class TelegramService {
       },
       body: JSON.stringify({
         url: webhookUrl,
+        allowed_updates: [
+          'message',
+          'callback_query',
+          'chat_join_request'
+        ]
       }),
     });
 
@@ -377,4 +382,58 @@ _يُستخدم هذا البوت للتحقق من العضوية والإشع
 
     await this.sendMessage(chatId, welcomeText.trim());
   }
+
+  async approveChatJoinRequest(chatId: number | string, userId: number): Promise<void> {
+    const url = `https://api.telegram.org/bot${this.botToken}/approveChatJoinRequest`;
+    
+    try {
+      const response = await fetch(url, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+        },
+        body: JSON.stringify({
+          chat_id: chatId,
+          user_id: userId,
+        }),
+      });
+
+      if (!response.ok) {
+        const error = await response.text();
+        throw new Error(`Failed to approve chat join request: ${response.status} ${error}`);
+      }
+
+      console.log(`Approved chat join request for user ${userId} in chat ${chatId}`);
+    } catch (error) {
+      console.error('Error approving chat join request:', error);
+      throw error;
+    }
+  }
+
+  async declineChatJoinRequest(chatId: number | string, userId: number): Promise<void> {
+    const url = `https://api.telegram.org/bot${this.botToken}/declineChatJoinRequest`;
+    
+    try {
+      const response = await fetch(url, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+        },
+        body: JSON.stringify({
+          chat_id: chatId,
+          user_id: userId,
+        }),
+      });
+
+      if (!response.ok) {
+        const error = await response.text();
+        throw new Error(`Failed to decline chat join request: ${response.status} ${error}`);
+      }
+
+      console.log(`Declined chat join request for user ${userId} in chat ${chatId}`);
+    } catch (error) {
+      console.error('Error declining chat join request:', error);
+      throw error;
+    }
+  }
 }

src/types/telegram.ts

@@ -67,6 +67,37 @@ export interface TelegramUpdate {
     };
     data?: string;
   };
+  chat_join_request?: {
+    chat: {
+      id: number;
+      title?: string;
+      username?: string;
+      type: string;
+    };
+    from: {
+      id: number;
+      is_bot: boolean;
+      first_name: string;
+      last_name?: string;
+      username?: string;
+      language_code?: string;
+    };
+    user_chat_id: number;
+    date: number;
+    bio?: string;
+    invite_link?: {
+      invite_link: string;
+      creator: {
+        id: number;
+        is_bot: boolean;
+        first_name: string;
+        username?: string;
+      };
+      creates_join_request: boolean;
+      is_primary?: boolean;
+      is_revoked?: boolean;
+    };
+  };
 }
 
 export interface InlineKeyboardButton {