bot server implementation

src/telegram.js

@@ -0,0 +1,116 @@
+
+const fs = require('fs');
+const path = require('path');
+const TelegramBot = require('node-telegram-bot-api');
+
+const filePath = path.join(__dirname, '../content/telegram_users.json');
+const token = process.env.TELEGRAM_BOT_TOKEN;
+
+const bot = new TelegramBot(token, { polling: true });
+
+const telegramBot = {
+    Initialize: function () {
+        bot.on('message', handleMessage);
+        bot.on('new_chat_members', handleNewChatMembers);
+        bot.on('contact', handleContact);
+        bot.onText(/start/, handleStartCommand);
+    },
+
+    updateUserDetails: function (chatId, phoneNumber) {
+        // Function body remains the same
+    }
+};
+
+function initializeBot() {
+    bot.on('message', handleMessage);
+    bot.on('new_chat_members', handleNewChatMembers);
+    bot.on('contact', handleContact);
+    bot.onText(/start/, handleStartCommand);
+}
+
+function handleMessage(msg) {
+    const chatId = msg.chat.id;
+    console.log("received message from chatId = " + chatId);
+}
+
+function handleNewChatMembers(msg) {
+    const chatId = msg.chat.id;
+    msg.new_chat_members.forEach(member => {
+        greetNewMember(chatId, member);
+    });
+}
+
+function greetNewMember(chatId, member) {
+    const userId = member.id;
+    const welcomeMessage = `Welcome, ${member.first_name}!`;
+    bot.restrictChatMember(chatId, userId, { can_send_messages: false });
+    bot.sendMessage(chatId, welcomeMessage);
+}
+
+function handleContact(msg) {
+    const chatId = msg.chat.id;
+    if (msg.contact && msg.contact.phone_number) {
+        updateUserDetails(chatId, msg.contact.phone_number);
+    } else {
+        bot.sendMessage(chatId, "You did not share your phone number.");
+    }
+}
+
+function handleStartCommand(msg) {
+    const chatId = msg.chat.id;
+    const options = {
+        reply_markup: {
+            one_time_keyboard: true,
+            keyboard: [
+                [{ text: "Разбира се!", request_contact: true, one_time_keyboard: true }],
+                ["Не сега"]
+            ],
+            resize_keyboard: true
+        },
+        parse_mode: 'Markdown'
+    };
+
+    bot.sendMessage(chatId, "Моля, потвърдете вашия телефонен номер:", options);
+}
+
+function updateUserDetails(chatId, phoneNumber) {
+    fs.readFile(filePath, 'utf8', (err, data) => {
+        let users = [];
+
+        if (err && err.code !== 'ENOENT') {
+            console.error("Error reading the file:", err);
+            return;
+        }
+
+        try {
+            if (!err) {
+                users = JSON.parse(data);
+            }
+        } catch (e) {
+            //failed to parse json. delete the file and create a new one
+            console.error("Error parsing the file:", e);
+            console.log("Deleting the file and creating a new one...");
+            fs.unlinkSync(filePath);
+        }
+
+        const userIndex = users.findIndex(user => user.phoneNumber === phoneNumber);
+        if (userIndex !== -1) {
+            users[userIndex].chatId = chatId;
+        } else {
+            users.push({ chatId, phoneNumber });
+        }
+
+        fs.writeFile(filePath, JSON.stringify(users, null, 2), 'utf8', (writeErr) => {
+            if (writeErr) {
+                console.error("Error writing to the file:", writeErr);
+                return;
+            }
+
+            console.log("User details updated.");
+        });
+    });
+}
+
+module.exports = { initializeBot, updateUserDetails };
+
+module.exports = telegramBot;