lapo.it
1(typeof define != 'undefined' ? define : function (factory) { 'use strict';
2 if (typeof module == 'object') factory(function (name) { return require(name); });
3 else factory(function (name) { return window[name.substring(2)]; });
4})(function (require) {
5"use strict";
6
7var ASN1 = require('./asn1'),
8 Base64 = require('./base64'),
9 Hex = require('./hex'),
10 maxLength = 10240,
11 reHex = /^\s*(?:[0-9A-Fa-f][0-9A-Fa-f]\s*)+$/,
12 tree = id('tree'),
13 dump = id('dump'),
14 wantHex = id('wantHex'),
15 area = id('area'),
16 file = id('file'),
17 examples = id('examples'),
18 hash = null;
19
20require('./dom'); // side effect: augment ASN1
21if (!window.console || !window.console.log) // IE8 with closed developer tools
22 window.console = { log: function () {} };
23function id(elem) {
24 return document.getElementById(elem);
25}
26function text(el, string) {
27 if ('textContent' in el)
28 el.textContent = string;
29 else
30 el.innerText = string;
31}
32function decode(der, offset) {
33 offset = offset || 0;
34 tree.innerHTML = '';
35 dump.innerHTML = '';
36 try {
37 var asn1 = ASN1.decode(der, offset);
38 tree.appendChild(asn1.toDOM());
39 if (wantHex.checked)
40 dump.appendChild(asn1.toHexDOM());
41 var b64 = (der.length < maxLength) ? asn1.toB64String() : '';
42 if (area.value === '')
43 area.value = Base64.pretty(b64);
44 try {
45 window.location.hash = hash = '#' + b64;
46 } catch (e) { // fails with "Access Denied" on IE with URLs longer than ~2048 chars
47 window.location.hash = hash = '#';
48 }
49 var endOffset = asn1.posEnd();
50 if (endOffset < der.length) {
51 var p = document.createElement('p');
52 p.innerText = 'Input contains ' + (der.length - endOffset) + ' more bytes to decode.';
53 var button = document.createElement('button');
54 button.innerText = 'try to decode';
55 button.onclick = function () {
56 decode(der, endOffset);
57 };
58 p.appendChild(button);
59 tree.insertBefore(p, tree.firstChild);
60 }
61 } catch (e) {
62 text(tree, e);
63 }
64}
65function decodeText(val) {
66 try {
67 var der = reHex.test(val) ? Hex.decode(val) : Base64.unarmor(val);
68 decode(der);
69 } catch (e) {
70 text(tree, e);
71 dump.innerHTML = '';
72 }
73}
74function decodeBinaryString(str) {
75 var der;
76 try {
77 if (reHex.test(str))
78 der = Hex.decode(str);
79 else if (Base64.re.test(str))
80 der = Base64.unarmor(str);
81 else
82 der = str;
83 decode(der);
84 } catch (e) {
85 text(tree, 'Cannot decode file.');
86 dump.innerHTML = '';
87 }
88}
89// set up buttons
90id('butDecode').onclick = function () { decodeText(area.value); };
91id('butClear').onclick = function () {
92 area.value = '';
93 file.value = '';
94 tree.innerHTML = '';
95 dump.innerHTML = '';
96 hash = window.location.hash = '';
97};
98id('butExample').onclick = function () {
99 console.log('Loading example:', examples.value);
100 var request = new XMLHttpRequest();
101 request.open('GET', 'examples/' + examples.value, true);
102 request.onreadystatechange = function() {
103 if (this.readyState !== 4)
104 return;
105 if (this.status >= 200 && this.status < 400) {
106 area.value = this.responseText;
107 decodeText(this.responseText);
108 } else {
109 console.log('Error loading example.');
110 }
111 };
112 request.send();
113};
114// this is only used if window.FileReader
115function read(f) {
116 area.value = ''; // clear text area, will get b64 content
117 var r = new FileReader();
118 r.onloadend = function () {
119 if (r.error)
120 alert("Your browser couldn't read the specified file (error code " + r.error.code + ").");
121 else
122 decodeBinaryString(r.result);
123 };
124 r.readAsBinaryString(f);
125}
126function load() {
127 if (file.files.length === 0)
128 alert("Select a file to load first.");
129 else
130 read(file.files[0]);
131}
132function loadFromHash() {
133 if (window.location.hash && window.location.hash != hash) {
134 hash = window.location.hash;
135 // Firefox is not consistent with other browsers and returns an
136 // already-decoded hash string so we risk double-decoding here,
137 // but since % is not allowed in base64 nor hexadecimal, it's ok
138 var val = decodeURIComponent(hash.substr(1));
139 if (val.length)
140 decodeText(val);
141 }
142}
143function stop(e) {
144 e.stopPropagation();
145 e.preventDefault();
146}
147function dragAccept(e) {
148 stop(e);
149 if (e.dataTransfer.files.length > 0)
150 read(e.dataTransfer.files[0]);
151}
152// main
153if ('onhashchange' in window)
154 window.onhashchange = loadFromHash;
155loadFromHash();
156document.ondragover = stop;
157document.ondragleave = stop;
158if ('FileReader' in window && 'readAsBinaryString' in (new FileReader())) {
159 file.style.display = 'block';
160 file.onchange = load;
161 document.ondrop = dragAccept;
162}
163
164});