lapo.it
1/*jshint browser: true, strict: true, globalstrict: true, indent: 4, immed: true, latedef: true, undef: true, regexdash: false */
2/*global Hex, Base64, ASN1 */
3"use strict";
4
5var reHex = /^\s*(?:[0-9A-Fa-f][0-9A-Fa-f]\s*)+$/,
6 hash = null;
7function id(elem) {
8 return document.getElementById(elem);
9}
10function toHTML(obj) {
11 return String(obj).replace(/</g, "<");
12}
13function decode(der) {
14 var tree = id('tree');
15 var dump = id('dump');
16 tree.innerHTML = '';
17 dump.innerHTML = '';
18 try {
19 var asn1 = ASN1.decode(der),
20 hex = asn1.toHexString();
21 tree.appendChild(asn1.toDOM());
22 if (id('wantHex').checked)
23 dump.appendChild(asn1.toHexDOM());
24 if (id('pem').value === '')
25 id('pem').value = hex;
26 // update URL hash
27 if (hex.length < 10240)
28 hash = window.location.hash = '#' + hex;
29 } catch (e) {
30 tree.innerHTML = toHTML(e);
31 }
32 return false;
33}
34function decodeArea() {
35 try {
36 var pem = id('pem').value;
37 var der = reHex.test(pem) ? Hex.decode(pem) : Base64.unarmor(pem);
38 decode(der);
39 } catch (e) {
40 id('tree').innerHTML = toHTML(e);
41 id('dump').innerHTML = '';
42 }
43 return false;
44}
45function decodeBinaryString(str) {
46 var der;
47 try {
48 if (reHex.test(str))
49 der = Hex.decode(str);
50 else if (Base64.re.test(str))
51 der = Base64.unarmor(str);
52 else
53 der = str;
54 decode(der);
55 } catch (e) {
56 id('tree').innerHTML = 'Cannot decode file.';
57 id('dump').innerHTML = '';
58 }
59 return false;
60}
61function clearAll() {
62 id('pem').value = '';
63 id('tree').innerHTML = '';
64 id('dump').innerHTML = '';
65 hash = window.location.hash = '';
66 return false;
67}
68// this is only used if window.FileReader
69function read(f) {
70 id('pem').value = ''; // clear text area, will get hex content
71 var r = new FileReader();
72 r.onloadend = function () {
73 if (r.error) {
74 alert("Your browser couldn't read the specified file (error code " + r.error.code + ").");
75 } else
76 decodeBinaryString(r.result);
77 };
78 r.readAsBinaryString(f);
79}
80function load() {
81 var file = id('file');
82 if (file.files.length === 0) {
83 alert("Select a file to load first.");
84 return false;
85 }
86 read(file.files[0]);
87 return false;
88}
89function loadFromHash() {
90 if (window.location.hash && window.location.hash != hash) {
91 hash = window.location.hash;
92 id('pem').value = hash.substring(1);
93 decodeArea();
94 }
95}
96function stop(e) {
97 e.stopPropagation();
98 e.preventDefault();
99}
100function dragAccept(e) {
101 stop(e);
102 if (e.dataTransfer.files.length > 0)
103 read(e.dataTransfer.files[0]);
104}
105window.onload = function () {
106 if ('onhashchange' in window)
107 window.onhashchange = loadFromHash;
108 loadFromHash();
109 document.ondragover = stop;
110 document.ondragleave = stop;
111 if ('FileReader' in window) {
112 id('file').style.display = 'block';
113 id('file').onchange = load;
114 document.ondrop = dragAccept;
115 }
116};