Code Check Exporter

code-check-exporter.user.js

// ==UserScript==
// @name         Code Check Exporter
// @namespace    https://zr.is/
// @version      0.5
// @description  Export all files in code checker. (SJSU)
// @author       Zeyi Fan (Zeray Rice)
// @match        http://cs20.cs.sjsu.edu:8080/codecheck/*
// @grant        none
// @require      https://raw.githubusercontent.com/Stuk/jszip/v2.4.0/dist/jszip.min.js
// @updateURL    https://gist.github.com/fanzeyi/c46ab3dc5319ac24b7f0/raw/code-check-exporter.user.js
// ==/UserScript==

(function() {
    var generateZip = function() {
        var zip = new JSZip(),
            preBlocks = [].slice.call(document.getElementsByTagName("pre")),
            textareaBlocks = [].slice.call(document.getElementsByTagName("textarea")),
            codeBlocks = preBlocks.concat(textareaBlocks);
        
        codeBlocks.forEach(function(block) {
            var content;
            if(block.tagName === "TEXTAREA") {
                content = block.value;
            } else {
                content = block.textContent;
            }
            zip.file(block.previousElementSibling.textContent, content);
        });
        var blob = zip.generate({
            type: 'blob'
        });
        return blob;
    };
    var blobUrl = URL.createObjectURL(generateZip());
    var downloadBtn = document.createElement('a');
    downloadBtn.href = blobUrl;
    downloadBtn.download = 'assignment.zip';
    downloadBtn.innerHTML = 'Export';
    document.body.insertBefore(downloadBtn, document.body.firstChild);
    
    // Drag'n'Drop
    document.addEventListener('dragover', function(e) {
        e.preventDefault();
        return false;
    });
    
    document.addEventListener('dragenter', function(e) {
        e.preventDefault();
        return false;
    });
    
    document.addEventListener('drop', function(e) {
        var dt = e.dataTransfer,
            files = [].slice.call(dt.files),
            textareaBlocks = [].slice.call(document.getElementsByTagName("textarea"));
        
        e.preventDefault();

        files.forEach(function(file) {
            if(file.name.slice(-5) != ".java") {
                return false;
            }
            textareaBlocks.forEach(function(submitBlock) {
                if(submitBlock.previousElementSibling.innerText === file.name) {
                    var reader = new FileReader();
                    reader.addEventListener('loadend', function(e, f) {
                        submitBlock.innerText = this.result;
                    });
                    reader.readAsText(file);
                }
            });
        });
        
        return false;
    });
})();