builder.html

<!DOCTYPE html>
<html>
	<head>
		<script async src="https://arc.io/widget.min.js#HEPCFa3K"></script>
		<meta charset="utf-8"/>
		<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
		<title>ayunWebEPK</title>
		<script type="text/javascript" src="jszip.min.js"></script>
		<script type="text/javascript" src="pako.min.js"></script>
		<script type="text/javascript" src="sha1.min.js"></script>
		<script type="text/javascript" src="ayunEPKDecompiler.js"></script>
		<script type="text/javascript" src="ayunEPKCompiler.js"></script>
		<link rel="preconnect" href="https://fonts.googleapis.com"/>
		<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin/>
		<link href="https://fonts.googleapis.com/css2?family=Nunito&display=swap" rel="stylesheet"/>
		<style>
			a:not([href]) {
				display: none;
			}
			*, ::file-selector-button {
				font-family: 'Nunito', sans-serif;
			}
			body {
				background-color: #111111;
				color: #dddddd;
			}
			input[disabled], button[disabled] {
				opacity: 0.8;
			}
			input[type=checkbox] {
				-webkit-appearance: initial;
        		-moz-appearance: initial;
        		appearance: initial;
				width: 1.5em;
				height: 1.5em;
				margin: 0;
			}
			input[type=checkbox]:checked {
				background-color: #eeeeee;
			}
			input[type=checkbox]:before {
				content: ':>';
				text-align: center;
				color: #dddddd;
				margin-left: 0.3em;
			}
			input[type=checkbox]:checked:before {
				color: #343434;
			}
			input[type=checkbox]:after {
				content: 'No';
				color: #dddddd;
				margin-left: 0.6em;
			}
			input[type=checkbox]:checked:after {
				content: 'Yes';
			}
			@supports (-webkit-touch-callout: none) or (background: -webkit-named-image(i)) {
				input[type=checkbox]:after {
					content: 'no';
				}
				input[type=checkbox]:checked:after {
					content: 'yes';
				}
			}
			@supports (-moz-appearance: none) {
				input[type=checkbox]:after {
					content: 'No.';
				}
				input[type=checkbox]:checked:after {
					content: 'Yes.';
				}
			}
			::file-selector-button, progress, input[type=checkbox], button, select, input[type=text] {
				background-color: #343434;
				color: #eeeeee;
				border: 1px solid #eeeeee;
				border-radius: 4px;
			}
			a, input[type=file] {
				color: #dddddd;
			}
			progress {
				height: 1em;
			}
			progress, ::-webkit-file-upload-button {
				-webkit-appearance: none;
        		-moz-appearance: none;
        		appearance: none;
			}
			progress[value="0"][max="1"] {
				display: none;
			}
			::-moz-progress-bar {
				background-color: #eeeeee;
			}
			::-webkit-progress-value {
				background-color: #eeeeee;
			}
			::-webkit-progress-bar {
				background-color: #343434;
				border-radius: 4px;
			}
			#editor.modei pre, #editor.modei audio, #editor.modea pre, #editor.modea img, #editor.modet img, #editor.modet audio, #editor.model {
				display: none;
			}
		</style>
	</head>
	<body>
		<sub><a href=".">Want to compile one instead?</a></sub>
		<br/>
		<sub><a href="decompile.html">Want to decompile one instead?</a></sub>
		<h1>ayunWebEPK</h1>
		<p>Customize EPK files in your browser!</p>
		Select base .EPK: <input type="file" onchange="selectFile(this);" accept=".epk"/>
		<br/>
		Compile to legacy format: <input type="checkbox"/>
		<br/>
		<button onclick="compileIt(document.querySelector('input[type=file]'));" disabled>Compile it!</button>
		<br/>
		<br/>
		<progress value="0" max="1"></progress>
		<a download="my-cool.epk">Download your EPK!</a>
		<div id="editor" class="model">
			<input type="text" placeholder="Search or enter file name..."/>
			<select></select>
			<button onclick="createFile(this.previousElementSibling.previousElementSibling.value);" disabled>Create file...</button>
			<button onclick="deleteCurrentFile();">Delete file...</button>
			<br/>
			<h3></h3>
			Change this file: <input type="file" onchange="changeFile(this);"/>
			<br/>
			<img/>
			<audio controls></audio>
			<pre></pre>
		</div>
		<script>
			const downloadLink = document.querySelectorAll('a')[2];
			const progressBar = document.querySelector('progress');
			const oldBox = document.querySelector('input[type=checkbox]');
			const compileBtn = document.querySelector('button');
			const editor = document.getElementById('editor');
			const dropdown = document.querySelector('select');
			const editorName = editor.querySelector('h3');
			const editorImage = editor.querySelector('img');
			const editorAudio = editor.querySelector('audio');
			const editorText = editor.querySelector('pre');
			const editorSearch = editor.querySelector('input[type=text]');

			editorSearch.value = '';

			// https://stackoverflow.com/a/68703218/6917520

			function prefix(words) {
				// check border cases size 1 array and empty first word)
				if (!words[0] || words.length ==  1) return words[0] || "";
				let i = 0;
				// while all words have the same character at position i, increment i
				while(words[0][i] && words.every(w => w[i] === words[0][i]))
					i++;
				
				// prefix is the substring from the beginning to the last successfully checked i
				return words[0].substr(0, i);
			}

			let epkFiles = [];
			let selectedFile = 0;

			function selectFile(fileElem) {
				epkFiles.length = 0;
				downloadLink.removeAttribute('href');
				fileElem.disabled = true;
				if (fileElem.files.length > 0) {
					const epkFile = fileElem.files[0];
					const reader = new FileReader();
					reader.onload = function(e) {
						progressBar.value = 0;
						progressBar.max = 1;
						window.decompileEPK()(e.target.result, function() {
							progressBar.max++;
							progressBar.value++;
						}).then(function(fileList) {
							if (fileList == null) {
								alert('Invalid EPK!');
								fileElem.value = '';
								progressBar.value = 0;
								progressBar.max = 1;
								fileElem.removeAttribute('disabled');
								return;
							}
							fileElem.value = '';
							progressBar.value = 0;
							progressBar.max = 1;
							fileElem.removeAttribute('disabled');
							epkFiles = fileList;
							editor.className = '';
							refreshDropdown();
							compileBtn.removeAttribute('disabled');
						});
					};
					reader.readAsArrayBuffer(epkFile);
				} else {
					fileElem.removeAttribute('disabled');
				}
			}
			
			function compileIt(fileElem) {
				compileBtn.disabled = true;
				fileElem.disabled = true;
				oldBox.disabled = true;
				progressBar.value = 0;
				progressBar.max = epkFiles.length;
				window.compileEPK()(epkFiles, oldBox.checked, function() {
					progressBar.value++;
				}).then(blob => {
					if (blob == null) {
						alert('Invalid EPK!');
						progressBar.value = 0;
						progressBar.max = 1;
						oldBox.removeAttribute('disabled');
						fileElem.removeAttribute('disabled');
						return;
					}
					downloadLink.href = window.URL.createObjectURL(blob);
					progressBar.value = 0;
					progressBar.max = 1;
					oldBox.removeAttribute('disabled');
					fileElem.removeAttribute('disabled');
					compileBtn.removeAttribute('disabled');
				});
			}

			function filterDropdown(str) {
				str = str.trim().toLowerCase();
				const queries = str.split(' ');
				const opts = [...dropdown.querySelectorAll('option')];
				let oldValue = dropdown.value;
				let selectedOne = false;
				for (const opt of opts) {
					opt.selected = false;
					opt.hidden = true;
					const lowerOptText = opt.text.toLowerCase();
					if (lowerOptText == str) {
						if (selectedOne) {
							selectedOne.selected = false;
						}
						selectedOne = opt;
						opt.selected = true;
						opt.hidden = false;
						continue;
					}
					for (const query of queries) {
						if (lowerOptText.includes(query)) {
							if (!selectedOne) {
								selectedOne = opt;
								opt.selected = true;
							}
							opt.hidden = false;
						}
					}
				}
				if (dropdown.value != oldValue) {
					dropdown.onchange();
				}
			}

			dropdown.onchange = function() {
				selectedFile = dropdown.value;
				const fileItem = epkFiles[selectedFile];
				editorName.innerText = fileItem.name;
				const lowerName = fileItem.name.toLowerCase();
				if (lowerName.endsWith('.mp3') || lowerName.endsWith('.ogg')) {
					editor.className = 'modea';
					editorAudio.src = window.URL.createObjectURL(fileItem.data);
				} else if (lowerName.endsWith('.png')) {
					editor.className = 'modei';
					editorImage.src = window.URL.createObjectURL(fileItem.data);
				} else {
					editor.className = 'modet';
					fileItem.data.text().then(t => {
						editorText.innerText = t;
					});
				}
			};

			function refreshDropdown() {
				dropdown.innerHTML = '';
				for (const fileInd in epkFiles) {
					if (epkFiles[fileInd].type != 'FILE') {
						continue;
					}
					dropdown.add(new Option(epkFiles[fileInd].name, fileInd, false, fileInd == 0));
				}
				dropdown.onchange();
				editorSearch.oninput();
			}

			function deleteCurrentFile() {
				epkFiles.splice(selectedFile, 1);
				refreshDropdown();
			}

			function createFile(name) {
				epkFiles.push({
					type: 'FILE',
					name: name,
					data: new Blob([])
				});
				refreshDropdown();
			}

			function changeFile(fileElem) {
				if (fileElem.files.length > 0) {
					epkFiles[selectedFile].data = fileElem.files[0];
					fileElem.value = '';
					dropdown.onchange();
				}
			}

			editorSearch.oninput = function() {
				filterDropdown(editorSearch.value);
				if (this.value != '' && epkFiles[this.nextElementSibling.value].name.toLowerCase() != this.value.toLowerCase()) {
					editorSearch.nextElementSibling.nextElementSibling.removeAttribute('disabled');
				} else {
					editorSearch.nextElementSibling.nextElementSibling.disabled = true;
				}
			};
		</script>
	</body>
</html>