eDimension Download Userscript

edimensionDownload.user.js

// ==UserScript==
// @name         eDimension Download Link
// @namespace    https://github.com/glencbz/edimensionDownloadLink
// @version      0.1
// @description  Adds a download link for eDimension
// @author       Glen Choo
// @match        http://edimension.sutd.edu.sg/course/view.php?id=*
// @grant       GM_addStyle
// @grant       GM_xmlhttpRequest
// @require http://code.jquery.com/jquery-latest.js
// ==/UserScript==
/* jshint -W097 */
'use strict';
 
var $ = window.jQuery;
var requestHeaders = {
	"Host": "edimension.sutd.edu.sg",
	"Connection": "keep-alive",
	"Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
	"Upgrade-Insecure-Requests": 1,
	"User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
	"Referer": window.location.href,
	"Accept-Encoding": "gzip, deflate, sdch",
	"Accept-Language": "en-GB,en-US;q=0.8,en;q=0.6",
	"Cookie": document.cookie,
};
var anchors = $(".mod-indent>a");
function requestAppend(anchor){
	// console.log(anchors[i].href);
	GM_xmlhttpRequest({
		method: "get",
		headers: requestHeaders,
		url: anchors[i].href,
		onreadystatechange: function(response){
	        if (response.readyState != 4)
	            return;
	        var tagStart = response.responseText.indexOf("<object");
	        if (tagStart !== -1){
	        	var tagEnd = response.responseText.indexOf("</object>") + "</object>".length;
	        	var urlStart = response.responseText.indexOf('data="', tagStart) + 'data="'.length;
	        	var urlEnd = response.responseText.indexOf('"', urlStart) + '"'.length;
	        	var style = "color:green";
	        	var innerHTML = "Download";
	        }
	        else{
	        	var outerTagStart = response.responseText.indexOf("resourceworkaround");
	        	var urlStart = response.responseText.indexOf('href="', outerTagStart) + 'href="'.length;
	        	var urlEnd = response.responseText.indexOf('"', urlStart);
	        	var style = "color:orange";
	        	var innerHTML = "Pop up";
	        }
	        style = style + ";margin-left:2%";

			// var parser = new DOMParser();
			// var doc = parser.parseFromString(response.responseText.substring(tagStart,tagEnd), "text/html");
			// // console.log(doc);
			// var node = doc.getElementById("resourceobject");
			// console.log(node);
			var resourceUrl = response.responseText.substring(urlStart, urlEnd);
			// console.log(resourceUrl);
			anchor.append('<a href=' + resourceUrl + ' download target="_blank" style='+ style + '>'+ innerHTML+'</a>');
		},
	});	
}
for (var i = 0; i < anchors.length; i++){
	try{
		var $anchor = $(anchors[i]);
		if ($anchor.children("img").attr("src") == "http://edimension.sutd.edu.sg/theme/image.php/campus/core/1434085985/f/pdf"){
			requestAppend($anchor);
		}
	}
	catch (err){
		console.log(err);
	}
}