Split codes to 4 Parts.

1. app.js
- API Endpoint ( Receive requests from Facebook page and start to make request to Facebook Graph API )
- Open port ( app.listen(PORT_NUMBER) ), Perform verification ( app.get('/webhook') )
- Use/Call Handler function from controller.js

2. controller.js
- Handle Message or Postback
- Use/Call model.js / template.js to make response
- Make request to Facebook's Graph API ( Messaging Platform ) using response, sender_psid

3. template.js
- Make JSON format using data given from controller.js
- Return JSON format ( to be  'response' object in controller.js )

4. models.js
- Get data from database.
- Give data required by controller.js.

-+2019/5/25
-+mother project : LINEBOT
-+new project : 페이스북 메신저 기반 컴공/소융 강의평가 봇
-+
+### mother project : LINEBOT
+최근 수정일 : 2019/5/31<br>
+new project : 페이스북 메신저 기반 컴공/소융 강의평가 봇<br>
+Description : Everytime 강의 평가 및 과 홈페이지를 기반으로 함. 
\ No newline at end of file

@@ -2,9 +2,8 @@
 let express = require("express"),
 let express = require("express"),
     bodyParser= require("body-parser"),
     bodyParser= require("body-parser"),
     app = express(),
     app = express(),
-    request = require('request'),
     config = require('config'),
     config = require('config'),
-    images = require("./pics");
+    controller = require('./controller');
 
 
 app.use(bodyParser.urlencoded({ extended : false}));
 app.use(bodyParser.urlencoded({ extended : false}));
 app.use(bodyParser.json());
 app.use(bodyParser.json());
@@ -20,7 +19,7 @@ app.get('/', (req, res) => res.send('Hello World!'));
 app.get('/webhook', (req, res) => {
 app.get('/webhook', (req, res) => {
 
 
   // Your verify token, Should be a random string.
   // Your verify token, Should be a random string.
-  let VERIFY_TOKEN = "2016104171";
+  let VERIFY_TOKEN = config.get('facebook.page.verify_token');
 
 
   // Parse the query params
   // Parse the query params
   let mode = req.query['hub.mode'];
   let mode = req.query['hub.mode'];
@@ -67,151 +66,17 @@ app.post('/webhook', (req, res) => {
       // Check if the event is a message or postback and
       // Check if the event is a message or postback and
       // pass the event to the appropriate handler function
       // pass the event to the appropriate handler function
       if (webhook_event.message) {
       if (webhook_event.message) {
-        handleMessage(sender_psid, webhook_event.message);
+        controller.handleMessage(sender_psid, webhook_event.message);
       } else if (webhook_event.postback) {
       } else if (webhook_event.postback) {
-        handlePostback(sender_psid, webhook_event.postback);
+        controller.handlePostback(sender_psid, webhook_event.postback);
       }
       }
     });
     });
-
     // Returns a '200 OK' response to all requests
     // Returns a '200 OK' response to all requests
     res.status(200).send('EVENT_RECEIVED');
     res.status(200).send('EVENT_RECEIVED');
   } else {
   } else {
-    // Returns a '404 Not Found' if event is not from a page subscription
+    // Returns a '404 Not Found' if event is ninteliot from a page subscription
     res.sendStatus(404);
     res.sendStatus(404);
   }
   }
-
 });
 });
 
 
-// Views - handle Message, handle Postback
-
-// Handles message events
-const handleMessage = (sender_psid, received_message) => {
-  let response;
-
-  if(received_message.text){
-
-    // Create the payload for a basic text message
-    response = askTemplate()
-  }
-
-  // Sends the reponse message
-  callSendAPI(sender_psid, response;
-}
-
-const handlePostback = (sender_psid, received_postback) => {
-  let response;
-
-  // Get the payload for the postback
-  let payload = received_postback.payload;
-
-  // Set the response based on the postback payload
-  if (payload === 'CAT_PICS') {
-    response = imageTemplate('cats', sender_psid);
-    callSendAPI(sender_psid, response, function(){
-      callSendAPI(sender_psid, askTemplate('Show me more'));
-    });
-  } else if (payload === 'DOG_PICS') {
-    response = imageTemplate('dogs', sender_psid);
-    callSendAPI(sender_psid, response, function(){
-      callSendAPI(sender_psid, askTemplate('Show me more'));
-    });
-  } else if(payload === 'GET_STARTED'){
-    response = askTemplate('Are you a Cat or Dog Person?');
-    callSendAPI(sender_psid, response);
-  }
-  // Send the message to acknowledge the postback
-}
-
-const askTemplate = (text) => {
-  return {
-    "attachment":{
-      "type":"template",
-      "payload":{
-        "template_type":"button",
-        "text": text,
-        "buttons":[
-          {
-            "type":"postback",
-            "title":"Cats",
-            "payload":"CAT_PICS"
-          },
-          {
-            "type":"postback",
-            "title":"Dogs",
-            "payload":"DOG_PICS"
-          }
-        ]
-      }
-    }
-  }
-}
-
-// Sends response messages via the Send API
-const callSendAPI = (sender_psid, response, cb = null) => {
-  // Construct the message body
-  let request_body = {
-    "recipient": {
-      "id": sender_psid
-    },
-    "message": response
-  };
-
-  // Send the HTTP request to the Messenger Platform
-  request({
-    "uri": "https://graph.facebook.com/v2.6/me/messages",
-    "qs": { "access_token": config.get('facebook.page.access_token') },
-    "method": "POST",
-    "json": request_body
-  }, (err, res, body) => {
-    if (!err) {
-      if(cb){
-        cb();
-      }
-    } else {
-      console.error("Unable to send message:" + err);
-    }
-  });
-}
-
-const imageTemplate= (type, sender_id) => {
-  return {
-    "attachment":{
-      "type":"image",
-      "payload":{
-        "url": getImage(type, sender_id),
-        "is_reusable":true
-      }
-    }
-  }
-}
-
-let users = {};
-
-const getImage= (type, sender_id) => {
-  // create user if doesn't exist
-  if(users[sender_id] === undefined){
-    users = Object.assign({
-      [sender_id] : {
-        'cats_count' : 0,
-        'dogs_count' : 0
-      }
-    }, users);
-  }
-
-  let count = images[type].length, // total available images by type
-      user = users[sender_id], // // user requesting image
-      user_type_count = user[type+'_count'];
-
-
-  // update user before returning image
-  let updated_user = {
-    [sender_id] : Object.assign(user, {
-      [type+'_count'] : count === user_type_count + 1 ? 0 : user_type_count + 1
-    })
-  };
-  // update users
-  users = Object.assign(users, updated_user);
 
 
-  console.log(users);
-  return images[type][user_type_count];
-}

+let request = require('request'),
+    template = require('./template'),
+    config = require('config');
+
+// Views - handle Message, handle Postback
+
+// Handles message events
+exports.handleMessage = (sender_psid, received_message) => {
+  let response;
+
+  if(received_message.text){
+
+    // Create the payload for a basic text message
+    response = template.askTemplate()
+  }
+
+  // Sends the reponse message
+  callSendAPI(sender_psid, response);
+}
+
+exports.handlePostback = (sender_psid, received_postback) => {
+  let response;
+
+  // Get the payload for the postback
+  let payload = received_postback.payload;
+
+  // Set the response based on the postback payload
+  if (payload === 'CAT_PICS') {
+    response = template.imageTemplate('cats', sender_psid);
+    callSendAPI(sender_psid, response, function(){
+      callSendAPI(sender_psid, template.askTemplate('Show me more'));
+    });
+  } else if (payload === 'DOG_PICS') {
+    response = template.imageTemplate('dogs', sender_psid);
+    callSendAPI(sender_psid, response, function(){
+      callSendAPI(sender_psid, template.askTemplate('Show me more'));
+    });
+  } else if(payload === 'GET_STARTED'){
+    response = template.askTemplate('Are you a Cat or Dog Person?');
+    callSendAPI(sender_psid, response);
+  }
+  // Send the message to acknowledge the postback
+}
+
+// Sends response messages via the Send API
+const callSendAPI = (sender_psid, response, cb = null) => {
+  // Construct the message body
+  let request_body = {
+    "recipient": {
+      "id": sender_psid
+    },
+    "message": response
+  };
+
+  // Send the HTTP request to the Messenger Platform
+  request({
+    "uri": "https://graph.facebook.com/v2.6/me/messages",
+    "qs": { "access_token": config.get('facebook.page.access_token') },
+    "method": "POST",
+    "json": request_body
+  }, (err, res, body) => {
+    if (!err) {
+      if(cb){
+        cb();
+      }
+    } else {
+      console.error("Unable to send message:" + err);
+    }
+  });
+}

+let images = require("./pics");
+
+
+exports.askTemplate = (text) => {
+  return {
+    "attachment":{
+      "type":"template",
+      "payload":{
+        "template_type":"button",
+        "text": text,
+        "buttons":[
+          {
+            "type":"postback",
+            "title":"Cats",
+            "payload":"CAT_PICS"
+          },
+          {
+            "type":"postback",
+            "title":"Dogs",
+            "payload":"DOG_PICS"
+          }
+        ]
+      }
+    }
+  }
+}
+
+
+
+exports.imageTemplate= (type, sender_id) => {
+  return {
+    "attachment":{
+      "type":"image",
+      "payload":{
+        "url": getImage(type, sender_id),
+        "is_reusable":true
+      }
+    }
+  }
+}
+
+let users = {};
+
+const getImage= (type, sender_id) => {
+  // create user if doesn't exist
+  if(users[sender_id] === undefined){
+    users = Object.assign({
+      [sender_id] : {
+        'cats_count' : 0,
+        'dogs_count' : 0
+      }
+    }, users);
+  }
+
+  let count = images[type].length, // total available images by type
+      user = users[sender_id], // // user requesting image
+      user_type_count = user[type+'_count'];
+
+
+  // update user before returning image
+  let updated_user = {
+    [sender_id] : Object.assign(user, {
+      [type+'_count'] : count === user_type_count + 1 ? 0 : user_type_count + 1
+    })
+  };
+  // update users
+  users = Object.assign(users, updated_user);
+
+  console.log(users);
+  return images[type][user_type_count];
+}