app.js

require("dotenv").config();
var express = require("express");
var path = require("path");
var favicon = require("serve-favicon");
var logger = require("morgan");
var cookieParser = require("cookie-parser");
var bodyParser = require("body-parser");
var twit = require("twit");
var request = require("request");

var gifKey = process.env.GIPHYKEY;

var T = new twit({
  consumer_key: process.env.TWITTERCONSUMERKEY,
  consumer_secret: process.env.TWITTERCONSUMERSECRET,
  access_token: process.env.TWITTERACCESSTOKEN,
  access_token_secret: process.env.TWITTERACCESSSECRET,
});

var routes = require("./routes/index");

var app = express();

// view engine setup
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "jade");

// uncomment after placing your favicon in /public
app.use(favicon(__dirname + "/public/favicon.ico"));
app.use(logger("dev"));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, "public")));

app.use("/", routes);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
  var err = new Error("Not Found");
  err.status = 404;
  next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get("env") === "development") {
  app.use(function (err, req, res, next) {
    res.status(err.status || 500);
    res.render("error", {
      message: err.message,
      error: err,
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function (err, req, res, next) {
  res.status(err.status || 500);
  res.render("error", {
    message: err.message,
    error: {},
  });
});

// Helper function to handle Regular Expressions escape
RegExp.escape = function (text) {
  return text.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
};

// Helper function to handle a replace all for a string
String.prototype.replaceAll = function (search, replace) {
  return this.replace(new RegExp(RegExp.escape(search), "g"), replace);
};

var stream = T.stream("statuses/filter", { track: "@thegiforacle" });

stream.on("tweet", function (tweet) {
  //console.log("TEXT: " + tweet.text);
  //console.log("USER: " + tweet.user.screen_name);

  var tweetText = tweet.text;
  var fromUser = "@" + tweet.user.screen_name;

  if (tweetText.toLowerCase().substring(0, 13) == "@thegiforacle") {
    var searchTerm = tweetText.toLowerCase().replaceAll("@thegiforacle ", "");
    var formattedSearchTerm = searchTerm.replaceAll(" ", "+");

    var URL =
      "http://api.giphy.com/v1/gifs/random?api_key=" +
      gifKey +
      "&tag=" +
      formattedSearchTerm;

    var result = "";

    //console.log("Starting request with URL " + URL);

    request(URL, function (error, response, body) {
      if (!error && response.statusCode == 200) {
        var jsonResponse = JSON.parse(body);
        // Attempt to get a result URL
        try {
          result = jsonResponse.data.url;
          // If a URLis ot returned, set null
        } catch (Exception) {
          result = null;
        }
        if (result !== null && result !== undefined) {
          var status = fromUser + " " + searchTerm + ": " + result;
          console.log("RESULT: " + status);
          T.post(
            "statuses/update",
            { status: status },
            function (err, data, response) {
              //console.log(data);
              console.log("Tweet Posted!");
            }
          );
        } else {
          var status2 = fromUser + " " + searchTerm + ": No GIF Available";
          T.post(
            "statuses/update",
            { status: status2 },
            function (err, data, response) {
              //console.log(data);
              console.log("Tweet Posted!");
            }
          );
        }
      }
    });
  } else {
    console.log("Ignoring tweet:" + tweetText);
  }
});

module.exports = app;