intercom_slack.js

module.exports = function(context, cb) {
  var slack = require("slack-notify")(context.secrets.SLACK_URL);
  var htmlToText = require("html-to-text");
  var body = context.body;
  var util = require('util');
  
  if(body !== null && body.data !== null && body.data.item !== null) {
    var item = body.data.item;
  
    if (isAuth0ExtendMessage(item, context.secrets.SUBJECT)) {
      var parts = item.conversation_parts.conversation_parts[0];
      
      //extract text from the HTML
      var text = htmlToText.fromString(parts.body, {
      	wordwrap: 130
      });
      
      var conversationUrl = item.links.conversation_web;
      
      // trim the text and add "... More"
      if (text.length > 215) {
        text = text.substring(0, 214) + `... <${conversationUrl}|More>`
      }
      
      var message = composeMessage(body, item, parts, conversationUrl, text, context.secrets.CHANNEL);
      slack.send(message);
    }
    
  }
  cb(null, null);
};

function isAuth0ExtendMessage(item, subject) {
  return (item.conversation_message !== null && item.conversation_message.subject == subject);
}

function createMessage(color, msgText, channel) {
  var message = {
    channel: channel,
    icon_url: "https://fst.slack-edge.com/2fac/plugins/intercom/assets/service_36.png",
    text: "*Intercom*",
    attachments: [
      {
        color: color,
        text: msgText
      }
    ]
  }
  return message;      
}

function composeMessage(body, item, parts, conversationUrl, text, channel) {
  var from = parts.author.name;
  var to;
  var color;
  
  if (parts.author.type === 'user') {
    to = item.assignee.name;
    var fromUrl = `https://app.intercom.io/apps/${body.app_id}/users/${parts.author.id}`;
    color = "#4277f4";
    msgText = `<${fromUrl}|${from}> replied to <${conversationUrl}|a conversation> with ${to}\n\n${text}`;
  }
  else {
    to = item.user.name;
    color = "#f4b541";
    msgText = `${from} replied to <${conversationUrl}|a conversation> with ${to}\n\n${text}`;
  }
  var message = createMessage(color, msgText, channel);
  return message;
}