Schoology userscript - Quickly download files off folder browsers (press raw to install) - Be sure to allow popups!

schoology-quickdl.user.js

// ==UserScript==
// @name         Schoology quick-download files helper
// @namespace    http://nicholastay.github.io/
// @version      0.3.0
// @author       Nicholas Tay <nexerq@gmail.com>
// @license      MIT
// @icon         https://i.imgur.com/QmmYqzZ.png
// @match        *://app.schoology.com/*
// @match        *://*.schoology.com/*
// @match        *://schoology.cgs.vic.edu.au/*
// @grant        none
// @homepage     https://gist.github.com/nicholastay/e6c108cc49bc297f50a1c417624e6601
// @downloadURL  https://gist.github.com/nicholastay/e6c108cc49bc297f50a1c417624e6601/raw/schoology-quickdl.user.js
// @noframes
// @require      https://unpkg.com/bottleneck@2.13.0/es5.js
// ==/UserScript==

;(function() {

// lets try not to kill schoology: 10 per 5s
var limiter = new Bottleneck({
	reservoir: 10,
	reservoirRefreshAmount: 100,
	reservoirRefreshInterval: 5 * 1000
});

injectCSS();
if (injectLabels())
	injectDownloadAll();
injectLabelEventHandler();
injectSubfolderHandler();
injectGroupResources();

console.log("[nexerq/quickDL] Initialized.");




function noop() {}

function injectCSS() {
	$("head").append("<style type=\"text/css\">.nexerq-quickdl-style:hover { text-decoration: underline; cursor: pointer; }</style>");
	console.log("[nexerq/quickDL] CSS injected");
}

function injectLabels(subfolder) {
	var $contentFiles = $("#folder-contents-table");
	if (!$contentFiles || ($contentFiles.length < 1))
		return console.log("[nexerq/quickDL] Not a folder listing page, not injecting that.");
	console.log("[nexerq/quickDL] Found folder listings.");

	var $documents = $contentFiles.find(".type-document:not(.nexerq-quickdl-processed)");
	if (!$documents || ($documents.length < 1)) {
		console.log("[nexerq/quickDL] No download documents found.");
		return false;
	}
	console.log("[nexerq/quickDL] Found " + $documents.length + " documents to process");

	$documents.each(function() {
		var $this = $(this);
		var $attachment = $this.find(".attachments-file-name");
		var $link = $attachment.find("a");

		// mark as processed
		$this.addClass("nexerq-quickdl-processed");

		// create dl btn
		var $newBtn = $attachment.find(".attachments-file-size").clone().appendTo($attachment);
		$newBtn.addClass("nexerq-quickdl-style");
		$newBtn.addClass("nexerq-quickdl-link");
		$newBtn.text("Download");
		$newBtn.attr("orig-link", $link.attr("href"));

		// weird subfolder bullshit
		var $subContent = $link.find(".infotip-content");
		$newBtn.attr("orig-name", ($subContent.length > 0 ? $subContent.text() : $link.text()));
		
		if (subfolder) // detection for quickdl all - do not include these!
			$newBtn.addClass("nexerq-quickdl-subfolder");
	});
	console.log("[nexerq/quickDL] Labels injected");
	return true;
}

function injectLabelEventHandler() {
	$(document).on("click", ".nexerq-quickdl-link", function() {
		var $this = $(this);
		var origName = $this.attr("orig-name");
		var origLink = $this.attr("orig-link");

		// kinda hacky: ajax http get the other page
		var req = function() {
			console.log("[nexerq/quickDL] Attempting to ajax get the target page (" + origName + ").");
			limiter.submit($.ajax, origLink, {
				success: function(data) {
					var $dl = $(data).find(".attachments-file a:first");
					if (!$dl || ($dl.length < 1)) {
						console.log("[nexerq/quickDL] File could not be found in success: " + origName);
						return alert("[nexerq/quickDL] Sorry, this file (" + origName + ") cannot be quick-downloaded at this time. You may have to just open the page and download manually.");
					}

					// dl
					invokeDownload(origName, $dl.attr("href"));
				},
				error: function(jqXHR, textStatus, err) {
					if (jqXHR.status === 429) {// 429 rate limited
						console.log("[nexerq/quickDL] Rate limited 429 on " + origName + ". Retry in 10s");
						setTimeout(req, 30000);
					}
				}
			}, noop); // noop cb
		};

		req();
	});
	console.log("[nexerq/quickDL] Event handler registered");
}

function invokeDownload(fileName, url) {
	console.log("[nexerq/quickDL] Downloading " + fileName + ".");

	// ugh - https://stackoverflow.com/questions/18451856/how-can-i-let-a-user-download-multiple-files-when-a-button-is-clicked
	//var tmpLink = document.createElement("a");
	//tmpLink.style.display = "none";
	//document.body.appendChild(tmpLink);
	//tmpLink.setAttribute("href", url);
	//tmpLink.setAttribute("download", fileName);
	//tmpLink.click();
	//document.body.removeChild(tmpLink);
	window.open(url, fileName + " - nexerq/quickDL");
}

function injectDownloadAll() {
	$(".materials-top").append(`<span class="attachments-file-size gray nexerq-quickdl-all nexerq-quickdl-style">Quick-download all (non-recursive)</span>`);
	$(".nexerq-quickdl-all").click(function() {
		console.log("[nexerq/quickDL] Downloading all available files...");

		// oh dear... recursion
		var $links = $(".nexerq-quickdl-link:not(.nexerq-quickdl-subfolder)");
		$links.each(function() {
			$(this).click();
		});
	});
	console.log("[nexerq/quickDL] Download all injected");
}

function injectSubfolderHandler() {
	// attach to document
	$(document).on("click", ".folder-contents-cell .folder-expander", function() {
		var $this = $(this);

		console.log("[nexerq/quickDL] Subfolder open detected");
		// wait for ajax to complete...
		var waitCount = 0;
		var $parentTd = $this.closest("td");
		var wait = setInterval(function() {
			var $subtree = $parentTd.children(".folder-subtree");
			if ($subtree && $subtree.length > 0) {
				clearInterval(wait);
				if (injectLabels(true)) {
					// inject dl all
					$parentTd.find(".folder-title").first().append(`<span class="attachments-file-size gray nexerq-quickdl-all-subfolder nexerq-quickdl-style">Quick-download all</span>`);
					$parentTd.find(".nexerq-quickdl-all-subfolder").click(function() {
						$parentTd.find(".nexerq-quickdl-link").each(function() {
							$(this).click();
						});
					});
					console.log("[nexerq/quickDL] Injected subfolder event and dl all");
				}
			}

			if (++waitCount > 5) {
				console.log("[nexerq/quickDL] Subfolder open - something went wrong while waiting.");
				clearInterval(wait);
			}
		}, 750);
	});
	console.log("[nexerq/quickDL] Event handler for subfolder handling injected");
}

// probably the worst implemented one
function injectGroupResources() {
	if (!window.location.pathname.includes("/group") || !window.location.pathname.includes("/materials"))
		return console.log("[nexerq/quickDL] Not a group resource page, not injecting that.");

	// wait. AJAX PLS
	var i = 0;
	console.log("[nexerq/quickDL] Waiting for group page...");
	var wait = setInterval(function() {
		var $groupResources = $("#collection-view");
		if (!$groupResources || ($groupResources.length < 1)) {
			if (++i > 5) {
				console.log("[nexerq/quickDL] Failed to find resources.");
				clearInterval(wait);
			}

			return;
		}

		clearInterval(wait);
		_injectGroupResources(); 
	}, 750);
}

function _injectGroupResources() {
	var $groupResources = $("#collection-view");

	// event handler
	$(document).on("click", ".nexerq-quickdl-group-link", function() {
		var $resource = $(this).closest(".template-s-content-generic-post-docviewer");
		var resId = $resource.attr("id").replace("t-", "");
		var origName = $resource.find(".item-title").text();

		// ajax get template, then the ID docviewer and parse its config
		// ... ughhhhhhhhhh
		console.log("[nexerq/quickDL] Trying group resource: " + origName);
		limiter.submit($.get, window.location.origin + "/template/" + resId, function(templateData) {
			console.log("[nexerq/quickDL] Got template data: " + origName);

			// time to docviewer
			limiter.submit($.get, window.location.origin + $(templateData).find(".docviewer-iframe").attr("src"), function(docData) {
				var $configFunc = $(docData).find("script:contains('pdfPath')");
				if (!$configFunc || ($configFunc.length < 1))
					return console.log("[nexerq/quickDL] Could not find pdfPath config: " + origName);

				var _docConfig = $configFunc.text().match(/PdfTronWebViewer, ({.*"}"}})/);
				if (!_docConfig)
					return console.log("[nexerq/quickDL] Could not parse pdfConfig: " + origName);

				var docConfig = JSON.parse(_docConfig[1]);

				var customConfig = JSON.parse(docConfig.options.custom);
				invokeDownload(origName, customConfig.downloadLink);
			});
		});
	});

	var $resources = $groupResources.find(".template-s-content-generic-post-docviewer:not(.nexerq-quickdl-processed)");
	if (!$resources || ($resources.length < 1))
		return console.log("[nexerq/quickDL] No download-docviewers found.");

	console.log("[nexerq/quickDL] Found " + $resources.length + " group resources to process");

	$resources.each(function() {
		var $resource = $(this);
		$resource.addClass("nexerq-quickdl-processed");

		$resource.find(".resource-details").append(`<span class="nexerq-quickdl-style nexerq-quickdl-group-link"> · Download</span>`);
	});
}

})();