text: 
  module.exports = function(RED) {
      "use strict";
      var PushOver = require('pushover-notifications');
      var util = require('util');
      var fs = require('fs');
  
      function PushoverNode(n) {
          RED.nodes.createNode(this,n);
          this.title = n.title;
          this.device = n.device;
          this.priority = n.priority;
          this.sound = n.sound;
          this.html = n.html;
          if (this.sound === '') { this.sound = null; }
          var credentials = this.credentials;
          if ((credentials) && (credentials.hasOwnProperty("pushkey"))) { this.pushkey = credentials.pushkey; }
          else { this.error("No Pushover api token set"); }
          if ((credentials) && (credentials.hasOwnProperty("deviceid"))) { this.deviceid = credentials.deviceid; }
          else { this.error("No Pushover user key set"); }
          var pusher = false;
          if (this.pushkey && this.deviceid) {
              pusher = new PushOver({
                  user: this.deviceid,
                  token: this.pushkey,
                  onerror: function(err) {
                      util.log('[57-pushover.js] Error: '+err);
                  }
              });
          }
          var node = this;
  
          this.on("input",function(msg) {
              var title = node.title || msg.topic || "Node-RED";
              var pri = node.priority || msg.priority || 0;
              var dev = node.device || msg.device;
              var sound = node.sound || msg.sound || null;
              var url = node.url || msg.url || null;
              var url_title = node.url_title || msg.url_title || null;
              var html = node.html || msg.html || false;
              var attachment = msg.attachment || null;
              var retry = msg.retry || 30;
              var expire = msg.expire || 600;
              if (isNaN(pri)) {pri=0;}
              if (pri > 2) {pri = 2;}
              if (pri < -2) {pri = -2;}
  			if (isNaN(retry)) {
                  retry = 30;
                  node.warn("No valid number for retry found, using default 30s retry interval");
              }
              if (isNaN(expire)) {
                  expire = 600;
                  node.warn("No valid number for expire time found, using default 600s retry duration");
              }
              if (retry < 30) {
                  retry = 30;
                  node.warn("Retry interval too low, using minimal 30s retry interval");
              }
              if (expire > 10800) {
                  expire = 10800;
                  node.warn("Expire time too high, using maximum setting of 10800s (3 hours) retry duration");
              }
              if (typeof msg.payload === 'undefined') { msg.payload = "(undefined msg.payload)"; }
              if (typeof(msg.payload) === 'object') {
                  msg.payload = JSON.stringify(msg.payload);
              }
              else { msg.payload = msg.payload.toString(); }
              if (pusher) {
                  var pushmsg = {
                      message: msg.payload,
                      title: title,
                      priority: pri,
                      retry: retry,
                      expire: expire,
                      html: html
                  };
                  if (dev) { pushmsg.device = dev; }
                  if (typeof(sound) === 'string') { pushmsg.sound = sound; }
                  if (typeof(url) === 'string') { pushmsg.url = url; }
                  if (typeof(url_title) === 'string') { pushmsg.url_title = url_title; }
                  if (html) { pushmsg.html = 1; }
                  if (typeof(attachment) === 'string') {
                      // Treat attachment as a path
                      fs.readFile(attachment,function(err, data) {
                          if (err) {
                              node.error("[57-pushover.js] Error: File Read Error: "+err);
                              return;
                          }
                          pushmsg.file = { data: data };
                          pushMessage(pushmsg);
                      });
                      return;
                  }
                  else if (attachment instanceof Buffer) {
                      // Is it base64 encoded or binary?
                      var attachmentString = attachment.toString();
                      var attachmentBuffer = Buffer.from(attachmentString,'base64');
                      if (attachmentString === attachmentBuffer.toString('base64')) {
                          // If converts back to same, then it was base64 so set to binary
                          // https://stackoverflow.com/a/48770228
                          attachment = attachmentBuffer;
                      }
                      // Unset these temporary values
                      attachmentBuffer = attachmentString = undefined;
                      // attach the buffer
                      pushmsg.file = { data: attachment };
                  }
                  else if (attachment) {
                      node.error("[57-pushover.js] Error: attachment property must be a path to a local file or a Buffer containing an image");
                      return;
                  }
                  pushMessage(pushmsg,msg);
              }
              else {
                  node.warn("Pushover credentials not set.");
              }
          });
  
          function pushMessage(pushmsg,msg) {
              pusher.send( pushmsg, function(err, response) {
                  if (err) { node.error(err,msg); }
                  else {
                      try {
                          var responseObject = JSON.parse(response);
                          if (responseObject.status !== 1) { node.error("[57-pushover.js] Error: "+response); }
                      }
                      catch(e) {
                          node.error("[57-pushover.js] Error: "+response);
                      }
                  }
              });
          }
      }
      RED.nodes.registerType("pushover",PushoverNode,{
          credentials: {
              deviceid: {type:"text"},
              pushkey: {type: "password"}
          }
      });
  }
  