index.js

"use strict";

// Dependencies

var Youtube = require("youtube-api"),
    Lien = require("lien"),
    Logger = require("bug-killer"),
    opn = require("opn"),
    readJson = require("r-json"),
    path = require("path"),
    tryAsync = require("try-async");

var credentials = readJson(__dirname + "/credentials.json");

// Set ACCESS_TOKEN global as undefined
var CREDENTIALS = readJson(__dirname + "/credentials.json");

// Init lien server
var server = new Lien({
    host: "localhost",
    port: 5000,
    public: __dirname + "/public"
});

server.on("load", function (err) {
    if (err) throw err;
    opn("http://localhost:5000");
});

// Authenticate
// You can access the Youtube resources via OAuth2 only.
// https://developers.google.com/youtube/v3/guides/moving_to_oauth#service_accounts
var oauth = Youtube.authenticate({
    type: "oauth",
    client_id: CREDENTIALS.web.client_id,
    client_secret: CREDENTIALS.web.client_secret,
    redirect_url: CREDENTIALS.web.redirect_uris[0]
});

var authDone = false;

// Handle oauth2 callback
server.addPage("/oauth2callback", function (lien) {
    oauth.getToken(lien.query.code, function (err, tokens) {

        if (err) {
            lien.lien(err, 400);
            return Logger.log(err);
        }

        oauth.setCredentials(tokens);
        authDone = true;

        lien.redirect("/");
    });
});

server.addPage("/", function (lien) {
    if (!authDone) {
        return lien.redirect(oauth.generateAuthUrl({
            access_type: "offline",
            scope: ["https://www.googleapis.com/auth/youtube"]
        }));
    }

    lien.file("html/index.html");
});

server.addPage("/api/run_code", "post", function (lien) {

    if (!authDone) {
        return lien.apiError("Please authenticate.", 403);
    }

    global.__api_run_code_callback = function (err, data) {
        if (err) {
            return lien.apiError(err);
        }
        return lien.end(data);
    };

    var formData = lien.data.code.replace(/_CALLBACK/g, "__api_run_code_callback");
    tryAsync(function () {
        eval(formData);
    }, function (err) {
        if (err) {
            return lien.end(err, 400);
        }
    });
});