Port basic features from Linebot

@@ -4,9 +4,21 @@ const TelegramBot = require('node-telegram-bot-api');
 const token = '825631426:AAE9tgw89kOZyLTre8DSDaObFQeVx7q41gw';
 
 // Create a bot that uses 'polling' to fetch new updates
-const bot = new TelegramBot(token, {polling: true});
+const bot = new TelegramBot(token, { polling: true });
 
-// Matches "/echo [whatever]"
+var request = require('request');
+
+// Translation api url
+const translate_api_url = 'https://openapi.naver.com/v1/papago/n2mt';
+
+// Language detection api url
+const languagedetect_api_url = 'https://openapi.naver.com/v1/papago/detectLangs'
+
+// Naver papago client id & secret
+const papago_client_id = 'lA0rGxQllAfrlOkGGNnK';
+const papago_client_secret = 'u3fykDlNb0';
+
+// /echo [whatever]
 bot.onText(/\/echo (.+)/, (msg, match) => {
   // 'msg' is the received Message from Telegram
   // 'match' is the result of executing the regexp above on the text content
@@ -19,11 +31,76 @@ bot.onText(/\/echo (.+)/, (msg, match) => {
   bot.sendMessage(chatId, resp);
 });
 
-// Listen for any kind of message. There are different kinds of
-// messages.
+// Listen for any kind of message. Translate if it's not a command.
 bot.on('message', (msg) => {
   const chatId = msg.chat.id;
+  const received_msg = msg.text;
+
+  // Ignore if input is a command
+  if (received_msg[0] == '/') {
+    return;
+  }
+
+  // Language detection options
+  var lang_detect_options = {
+    url: languagedetect_api_url,
+    form: { 'query': received_msg },
+    headers: {
+      'X-Naver-Client-Id': papago_client_id,
+      'X-Naver-Client-Secret': papago_client_secret
+    }
+  };
+
+  // Papago language detection
+  request.post(lang_detect_options, function (error, response, body) {
+    console.log(response.statusCode);
+    if (!error && response.statusCode == 200) {
+      var detect_body = JSON.parse(response.body);
+      var source = '';
+      var target = '';
+      var result = { type: 'text', text: '' };
+
+      // Check if detection was successful
+      console.log(detect_body.langCode);
+
+      // Translate using papago, only Korean and English are supported atm
+      if (detect_body.langCode == 'ko' || detect_body.langCode == 'en') {
+        source = detect_body.langCode == 'ko' ? 'ko' : 'en';
+        target = source == 'ko' ? 'en' : 'ko';
+
+        // Papago translation options
+        var translate_options = {
+          url: translate_api_url,
+          // 한국어(source : ko), 영어(target: en), 카톡에서 받는 메시지(text)
+          form: {
+            'source': source, // Translate from source
+            'target': target, // to target
+            'text': received_msg // Message to translate
+          },
+          headers: {
+            'X-Naver-Client-Id': papago_client_id,
+            'X-Naver-Client-Secret': papago_client_secret
+          }
+        };
+
+        // Send translatation request
+        request.post(translate_options, function (error, response, body) {
+          // On success
+          if (!error && response.statusCode == 200) {
+            var objBody = JSON.parse(response.body);
+            result.text = objBody.message.result.translatedText;
 
-  // send a message to the chat acknowledging receipt of their message
-  bot.sendMessage(chatId, 'Received your message');
+            // Send translated message
+            console.log(result.text);
+            bot.sendMessage(chatId, result.text);
+          }
+        });
+      }
+      // Language not detected
+      else {
+        result.text = '언어를 감지할 수 없습니다. \n 번역 언어는 한글 또는 영어만 가능합니다.';
+        bot.sendMessage(chatId, result.text);
+      }
+    }
+  });
 });