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// ==UserScript==
// @name DDL@ebook-dl.com
// @namespace DDL@ebook-dl.com
// @description Enables direct/faster downloads of ebooks on ebook-dl.com.
// @include http://ebook-dl.com/*
// @icon http://ebook-dl.com/assets/images/favicon.png
// @require https://code.jquery.com/jquery-3.1.1.min.js
// @updateURL https://openuserjs.org/meta/Paxae3/DDLebook-dl.com.meta.js
// @date 26.05.2017
// @version 1.3.2
// @author Paxae3
// @copyright 2017, Paxae3
// @license MIT License
// ==/UserScript==
// debugging option
var LOGGING = false;
// global semaphore for blocking further download requests, if previous ones haven't finished yet
var ACTION_PENDING = false;
var HOST = "http://ebook-dl.com";
// bypass our own version of jQuery
var $J = jQuery.noConflict( true );
// add timeout for all ajax requests
$J.ajaxSetup({timeout:2000});
//
// logs param into console, depending on global logging value
//
function log(text)
{
if(!LOGGING)return;
console.log("DDL@ebook-dl: "+text);
}
//
// generates/extracts IDs from eBook-URL
//
function getIDfromURL(url)
{
return url.substring(url.lastIndexOf('/')+1);
}
//
// switches hover color of generated download links to submitted value
//
function toggleLinkColor(color)
{
$J("#hoverColor").html('h3[download]:hover {color: '+color+'!important;}');
log("Link colors toggled to "+color);
}
//
// checks if download exists or not - gives us chance to handle errors by ourselves
//
function fileExists(url)
{
url = url.trim();
var response = $J.ajax({
url: url,
type: 'HEAD',
async: false
}).status;
log('File with URL "'+url+'" does'+((response !== 200)?'\'nt':'')+ ' exist!');
return response === 200;
}
//
// adds icon to link with Bootstrap-IconClass and Bootstrap-ColorClass
//
function addIcon(h3LinkObject, stringIconClass, stringColor)
{
$J(h3LinkObject).find("div[icon]").attr( "class", "fa fa-"+stringIconClass).css("color",stringColor);
log('Icon added: '+stringIconClass+' in color '+stringColor);
}
// create download-buttons on all relating links
$J(".post-content .image-box.effect.dia").append('<div class="image-box-content" style="top:0px;bottom:auto;position:absolute;" download>'+
'<h3 style="color:#333;width:100%;'+
' text-align:center;'+
' background-color:darkgrey;'+
' border: 4px solid darkgrey;'+
' border-radius:4px;'+
' padding-left:10px;'+
' padding-right:10px;'+
' display:inline;position:relative;" download>Download'+
'<div class="fa" style="position:absolute;right:10px;top:2px;" icon></div>'+
'</h3>'+
'</div>');
log("download buttons created.");
// some general styles for our donwload-buttons
$J('head').append('<style>*[download] {transform: translate3d(0, -100%, 0)!important;}'+
' .image-box.effect.dia:hover .image-box-content,'+
' .image-box.effect.dia:hover h3 {transform: translate3d(0, 0, 0)!important;}'+
'</style>');
log("styles for download buttons added [1/2].");
// hover style for link color - changeable by switching css inside html tag
$J('head').append('<style id="hoverColor"> h3[download]:hover {color: green!important;}</style>');
log("styles for download buttons added [2/2].");
// add event-listener to all new download-buttons
$J("h3[download]").click( function(e)
{
log("action catched.");
e.stopPropagation();
if(ACTION_PENDING)
{
log("action rejected - another action processed already.");
return;
}
ACTION_PENDING = true;
toggleLinkColor("orange");
// add pending icon
addIcon(this, "cog fa-spin fa-fw", "orange");
var _this = this;
log("trying to fetch data from "+HOST+"/downloadbook/" + getIDfromURL( $J(_this).parent().prev().attr("href"))+"/ ...");
// getting download page
$J.ajax({
url: "/downloadbook/" + getIDfromURL( $J(_this).parent().prev().attr("href")),
type: "GET",
// dataType: "text/html",
timeout: 2000,
success: function(response)
{
log("data received.");
// getting download link
const regex = /url=(\S*)"/g;
var m,tmp;
while ((tmp = regex.exec(response)) !== null)
{
m = tmp;
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex)
{
regex.lastIndex++;
}
}
log("data processed.");
if(m.length > 0)
{
log("extracted download url: "+m[1]);
// download exists?
if(fileExists(HOST + m[1]))
{
// starting download
log("starting download ...");
window.location.href = HOST + m[1];
}
else
{
// set link color to red
$J(_this).css('color','red');
// add error icon
addIcon(_this, "exclamation-circle", "red");
}
}
else
{
log("no download link found!");
}
ACTION_PENDING = false;
toggleLinkColor("green");
// add success icon
addIcon(_this, "check-circle", "green");
},
error: function(x, t, m)
{
log("failed to fetch download page: "+HOST+"/downloadbook/" + getIDfromURL( $J(_this).parent().prev().attr("href") ));
toggleLinkColor("green");
ACTION_PENDING = false;
// set link color to red
$J(_this).css('color','red');
// add error icon
addIcon(_this, "exclamation-circle", "red");
}
});
});
log("listeners added.");