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JavaScript generic ASN.1 parser (mirror)
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234import { ASN1DOM } from './dom.js';import { Base64 } from './base64.js';import { Hex } from './hex.js';import { Defs } from './defs.js';import { tags } from './tags.js';
const maxLength = 10240, reHex = /^\s*(?:[0-9A-Fa-f][0-9A-Fa-f]\s*)+$/, tree = id('tree'), dump = id('dump'), wantHex = checkbox('wantHex'), trimHex = checkbox('trimHex'), wantDef = checkbox('wantDef'), area = id('area'), file = id('file'), examples = id('examples'), selectTheme = id('theme-select'), selectDefs = id('definitions'), selectTag = id('tags');
let hash = null;
if (!window.console || !window.console.log) // IE8 with closed developer tools window.console = { log: function () {} };function id(elem) { return document.getElementById(elem);}function text(el, string) { if ('textContent' in el) el.textContent = string; else el.innerText = string;}function checkbox(name) { const el = id(name); const cfg = localStorage.getItem(name); if (cfg === 'false') el.checked = false; el.onchange = () => localStorage.setItem(name, el.checked); return el;}function show(asn1) { tree.innerHTML = ''; dump.innerHTML = ''; tree.appendChild(asn1.toDOM()); if (wantHex.checked) dump.appendChild(asn1.toHexDOM(undefined, trimHex.checked));}function decode(der, offset) { offset = offset || 0; try { const asn1 = ASN1DOM.decode(der, offset); if (wantDef.checked) { selectDefs.innerHTML = ''; const types = Defs.commonTypes .map(type => { const stats = Defs.match(asn1, type); return { type, match: stats.recognized / stats.total }; }) .sort((a, b) => b.match - a.match); for (const t of types) { t.element = document.createElement('option'); t.element.innerText = (t.match * 100).toFixed(1) + '% ' + t.type.description; selectDefs.appendChild(t.element); } let not = document.createElement('option'); not.innerText = 'no definition'; selectDefs.appendChild(not); Defs.match(asn1, types[0].type); selectDefs.onchange = () => { for (const t of types) { if (t.element == selectDefs.selectedOptions[0]) { Defs.match(asn1, t.type); show(asn1); return; } } Defs.match(asn1, null); show(asn1); }; } else selectDefs.innerHTML = '<option>no definition</option>'; show(asn1); let b64 = der.length < maxLength ? asn1.toB64String() : ''; if (area.value === '') area.value = Base64.pretty(b64); try { window.location.hash = hash = '#' + b64; } catch (e) { // fails with "Access Denied" on IE with URLs longer than ~2048 chars window.location.hash = hash = '#'; } let endOffset = asn1.posEnd(); if (endOffset < der.length) { let p = document.createElement('p'); p.innerText = 'Input contains ' + (der.length - endOffset) + ' more bytes to decode.'; let button = document.createElement('button'); button.innerText = 'try to decode'; button.onclick = function () { decode(der, endOffset); }; p.appendChild(button); tree.insertBefore(p, tree.firstChild); } } catch (e) { text(tree, e); }}function decodeText(val) { try { let der = reHex.test(val) ? Hex.decode(val) : Base64.unarmor(val); decode(der); } catch (e) { text(tree, e); dump.innerHTML = ''; }}function decodeBinaryString(str) { let der; try { if (reHex.test(str)) der = Hex.decode(str); else if (Base64.re.test(str)) der = Base64.unarmor(str); else der = str; decode(der); } catch (e) { text(tree, 'Cannot decode file.'); dump.innerHTML = ''; }}// set up buttonsid('butDecode').onclick = function () { decodeText(area.value);};id('butClear').onclick = function () { area.value = ''; file.value = ''; tree.innerHTML = ''; dump.innerHTML = ''; selectDefs.innerHTML = ''; hash = window.location.hash = '';};id('butExample').onclick = function () { console.log('Loading example:', examples.value); let request = new XMLHttpRequest(); request.open('GET', 'examples/' + examples.value, true); request.onreadystatechange = function () { if (this.readyState !== 4) return; if (this.status >= 200 && this.status < 400) { area.value = this.responseText; decodeText(this.responseText); } else { console.log('Error loading example.'); } }; request.send();};// set dark theme depending on OS settingsfunction setTheme() { let storedTheme = localStorage.getItem('theme'); let theme = 'os'; if (storedTheme) theme = storedTheme; selectTheme.value = theme; if (theme == 'os') { let prefersDarkScheme = window.matchMedia('(prefers-color-scheme: dark)'); theme = prefersDarkScheme.matches ? 'dark': 'light'; } if (theme == 'dark') { const css1 = id('theme-base'); const css2 = css1.cloneNode(); css2.id = 'theme-override'; css2.href = 'index-' + theme + '.css'; css1.parentElement.appendChild(css2); } else { const css2 = id('theme-override'); if (css2) css2.remove(); }}setTheme();selectTheme.addEventListener('change', function () { localStorage.setItem('theme', selectTheme.value); setTheme();});// this is only used if window.FileReaderfunction read(f) { area.value = ''; // clear text area, will get b64 content let r = new FileReader(); r.onloadend = function () { if (r.error) alert("Your browser couldn't read the specified file (error code " + r.error.code + ').'); else decodeBinaryString(r.result); }; r.readAsBinaryString(f);}function load() { if (file.files.length === 0) alert('Select a file to load first.'); else read(file.files[0]);}function loadFromHash() { if (window.location.hash && window.location.hash != hash) { hash = window.location.hash; // Firefox is not consistent with other browsers and returns an // already-decoded hash string so we risk double-decoding here, // but since % is not allowed in base64 nor hexadecimal, it's ok let val = decodeURIComponent(hash.substr(1)); if (val.length) decodeText(val); }}function stop(e) { e.stopPropagation(); e.preventDefault();}function dragAccept(e) { stop(e); if (e.dataTransfer.files.length > 0) read(e.dataTransfer.files[0]);}// mainif ('onhashchange' in window) window.onhashchange = loadFromHash;loadFromHash();document.ondragover = stop;document.ondragleave = stop;if ('FileReader' in window && 'readAsBinaryString' in new FileReader()) { file.style.display = 'block'; file.onchange = load; document.ondrop = dragAccept;}for (let tag in tags) { let date = tags[tag]; let el = document.createElement('option'); el.value = tag; el.innerText = date + ' ' + tag; selectTag.appendChild(el);}selectTag.onchange = function (ev) { let tag = ev.target.selectedOptions[0].value; window.location.href = 'https://rawcdn.githack.com/lapo-luchini/asn1js/' + tag + '/index.html';};