Facebook Messenger Bot, aws lambdaでおうむ返しbot

index.js

const request = require('request');

const PAGE_ACCESS_TOKEN = "";

var options = {
    hostname: "graph.facebook.com",
    path:  "/v2.6/me/messages?access_token=" + PAGE_ACCESS_TOKEN,
    method: 'POST',
    headers: {
        'Content-Type': 'application/json'
    }
}

exports.handler = function(event, context) {
    console.log('Received event:', JSON.stringify(event, null, 2));

    var data = event;

    // Make sure this is a page subscription
    if (data.object == 'page') {
      // Iterate over each entry
      // There may be multiple if batched
      data.entry.forEach(function(pageEntry) {
        var pageID = pageEntry.id;
        var timeOfEvent = pageEntry.time;

        // Iterate over each messaging event
        pageEntry.messaging.forEach(function(messagingEvent) {
          if (messagingEvent.optin) {
            // receivedAuthentication(messagingEvent);
          } else if (messagingEvent.message) {
            receivedMessage(messagingEvent);
          } else if (messagingEvent.delivery) {
            // receivedDeliveryConfirmation(messagingEvent);
          } else if (messagingEvent.postback) {
            // receivedPostback(messagingEvent);
          } else if (messagingEvent.read) {
            // receivedMessageRead(messagingEvent);
          } else if (messagingEvent.account_linking) {
            // receivedAccountLink(messagingEvent);
          } else {
            console.log("Webhook received unknown messagingEvent: ", messagingEvent);
          }
        });
      });
    }
}

function receivedMessage(event) {
  var senderID = event.sender.id;
  var recipientID = event.recipient.id;
  var timeOfMessage = event.timestamp;
  var message = event.message;

  console.log("Received message for user %d and page %d at %d with message:",
    senderID, recipientID, timeOfMessage);
  console.log(JSON.stringify(message));

  var isEcho = message.is_echo;
  var messageId = message.mid;
  var appId = message.app_id;
  var metadata = message.metadata;

  var messageText = message.text;
  var messageAttachments = message.attachments;
  var quickReply = message.quick_reply;

  if (isEcho) {
    console.log("Received echo for message %s and app %d with metadata %s",
      messageId, appId, metadata);
    return;
  } else if (quickReply) {
    var quickReplyPayload = quickReply.payload;
    console.log("Quick reply for message %s with payload %s",
      messageId, quickReplyPayload);

    sendTextMessage(senderID, "Quick reply tapped");
    return;
  }

  if (messageText) {
  sendTextMessage(senderID, messageText);
  } else if (messageAttachments) {
    sendTextMessage(senderID, "Message with attachment received");
  }
}

function sendTextMessage(recipientId, messageText) {
  var messageData = {
    recipient: {
      id: recipientId
    },
    message: {
      text: messageText
    }
  };

  callSendAPI(messageData);
}


function callSendAPI(messageData) {

  request({
    uri: 'https://graph.facebook.com/v2.6/me/messages',
    qs: { access_token: PAGE_ACCESS_TOKEN },
    method: 'POST',
    json: messageData

  }, function (error, response, body) {
    if (!error && response.statusCode == 200) {
      var recipientId = body.recipient_id;
      var messageId = body.message_id;

      if (messageId) {
        console.log("Successfully sent message with id %s to recipient %s",
          messageId, recipientId);
      } else {
      console.log("Successfully called Send API for recipient %s",
        recipientId);
      }
    } else {
      console.error("Failed calling Send API", response.statusCode, response.statusMessage, body.error);
    }
  });
}