Mercurial > pub > ImplabJs

comparison src/implab/Uuid.js @ 34:27e8e9e38e07 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Слияние
author nickolay
date Wed, 05 Jun 2019 20:44:15 +0300
parents 8af8e840dd49 1dc2fd263b90
children
comparison
equal deleted inserted replaced
33:8af8e840dd49 34:27e8e9e38e07
1 // uuid.js
2 //
3 // Copyright (c) 2010-2012 Robert Kieffer
4 // MIT License - http://opensource.org/licenses/mit-license.php
5 define([], function () {
6 'use strict';
7
8 var _window = 'undefined' !== typeof window ? window : null;
9
10 // Unique ID creation requires a high quality random # generator. We
11 // feature
12 // detect to determine the best RNG source, normalizing to a function
13 // that
14 // returns 128-bits of randomness, since that's what's usually required
15 var _rng, _mathRNG, _nodeRNG, _whatwgRNG, _previousRoot;
16
17 function setupBrowser() {
18 // Allow for MSIE11 msCrypto
19 var _crypto = _window.crypto || _window.msCrypto;
20
21 if (!_rng && _crypto && _crypto.getRandomValues) {
22 // WHATWG crypto-based RNG - http://wiki.whatwg.org/wiki/Crypto
23 //
24 // Moderately fast, high quality
25 try {
26 var _rnds8 = new Uint8Array(16);
27 _whatwgRNG = _rng = function whatwgRNG() {
28 _crypto.getRandomValues(_rnds8);
29 return _rnds8;
30 };
31 _rng();
32 } catch (e) { /**/ }
33 }
34
35 if (!_rng) {
36 // Math.random()-based (RNG)
37 //
38 // If all else fails, use Math.random(). It's fast, but is of
39 // unspecified
40 // quality.
41 var _rnds = new Array(16);
42 _mathRNG = _rng = function () {
43 for (var i = 0, r; i < 16; i++) {
44 if ((i & 0x03) === 0) {
45 r = Math.random() * 0x100000000;
46 }
47 _rnds[i] = r >>> ((i & 0x03) << 3) & 0xff;
48 }
49
50 return _rnds;
51 };
52 if ('undefined' !== typeof console && console.warn) {
53 console
54 .warn("[SECURITY] node-uuid: crypto not usable, falling back to insecure Math.random()");
55 }
56 }
57 }
58
59 function setupNode() {
60 // Node.js crypto-based RNG -
61 // http://nodejs.org/docs/v0.6.2/api/crypto.html
62 //
63 // Moderately fast, high quality
64 if ('function' === typeof require) {
65 try {
66 var _rb = require('crypto').randomBytes;
67 _nodeRNG = _rng = _rb && function () {
68 return _rb(16);
69 };
70 _rng();
71 } catch (e) { /**/ }
72 }
73 }
74
75 if (_window) {
76 setupBrowser();
77 } else {
78 setupNode();
79 }
80
81 // Buffer class to use
82 var BufferClass = ('function' === typeof Buffer) ? Buffer : Array;
83
84 // Maps for number <-> hex string conversion
85 var _byteToHex = [];
86 var _hexToByte = {};
87 for (var i = 0; i < 256; i++) {
88 _byteToHex[i] = (i + 0x100).toString(16).substr(1);
89 _hexToByte[_byteToHex[i]] = i;
90 }
91
92 // **`parse()` - Parse a UUID into it's component bytes**
93 function parse(s, buf, offset) {
94 var i = (buf && offset) || 0,
95 ii = 0;
96
97 buf = buf || [];
98 s.toLowerCase().replace(/[0-9a-f]{2}/g, function (oct) {
99 if (ii < 16) { // Don't overflow!
100 buf[i + ii++] = _hexToByte[oct];
101 }
102 });
103
104 // Zero out remaining bytes if string was short
105 while (ii < 16) {
106 buf[i + ii++] = 0;
107 }
108
109 return buf;
110 }
111
112 // **`unparse()` - Convert UUID byte array (ala parse()) into a string**
113 function unparse(buf, offset) {
114 var i = offset || 0,
115 bth = _byteToHex;
116 return bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]] +
117 bth[buf[i++]] + '-' + bth[buf[i++]] + bth[buf[i++]] + '-' +
118 bth[buf[i++]] + bth[buf[i++]] + '-' + bth[buf[i++]] +
119 bth[buf[i++]] + '-' + bth[buf[i++]] + bth[buf[i++]] +
120 bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]];
121 }
122
123 // **`v1()` - Generate time-based UUID**
124 //
125 // Inspired by https://github.com/LiosK/UUID.js
126 // and http://docs.python.org/library/uuid.html
127
128 // random #'s we need to init node and clockseq
129 var _seedBytes = _rng();
130
131 // Per 4.5, create and 48-bit node id, (47 random bits + multicast bit =
132 // 1)
133 var _nodeId = [
134 _seedBytes[0] | 0x01,
135 _seedBytes[1],
136 _seedBytes[2],
137 _seedBytes[3],
138 _seedBytes[4],
139 _seedBytes[5]
140 ];
141
142 // Per 4.2.2, randomize (14 bit) clockseq
143 var _clockseq = (_seedBytes[6] << 8 | _seedBytes[7]) & 0x3fff;
144
145 // Previous uuid creation time
146 var _lastMSecs = 0,
147 _lastNSecs = 0;
148
149 // See https://github.com/broofa/node-uuid for API details
150 function v1(options, buf, offset) {
151 var i = buf && offset || 0;
152 var b = buf || [];
153
154 options = options || {};
155
156 var clockseq = (options.clockseq != null) ? options.clockseq : _clockseq;
157
158 // UUID timestamps are 100 nano-second units since the Gregorian
159 // epoch,
160 // (1582-10-15 00:00). JSNumbers aren't precise enough for this, so
161 // time is handled internally as 'msecs' (integer milliseconds) and
162 // 'nsecs'
163 // (100-nanoseconds offset from msecs) since unix epoch, 1970-01-01
164 // 00:00.
165 var msecs = (options.msecs != null) ? options.msecs : new Date()
166 .getTime();
167
168 // Per 4.2.1.2, use count of uuid's generated during the current
169 // clock
170 // cycle to simulate higher resolution clock
171 var nsecs = (options.nsecs != null) ? options.nsecs : _lastNSecs + 1;
172
173 // Time since last uuid creation (in msecs)
174 var dt = (msecs - _lastMSecs) + (nsecs - _lastNSecs) / 10000;
175
176 // Per 4.2.1.2, Bump clockseq on clock regression
177 if (dt < 0 && options.clockseq == null) {
178 clockseq = clockseq + 1 & 0x3fff;
179 }
180
181 // Reset nsecs if clock regresses (new clockseq) or we've moved onto
182 // a new
183 // time interval
184 if ((dt < 0 || msecs > _lastMSecs) && options.nsecs == null) {
185 nsecs = 0;
186 }
187
188 // Per 4.2.1.2 Throw error if too many uuids are requested
189 if (nsecs >= 10000) {
190 throw new Error(
191 'uuid.v1(): Can\'t create more than 10M uuids/sec');
192 }
193
194 _lastMSecs = msecs;
195 _lastNSecs = nsecs;
196 _clockseq = clockseq;
197
198 // Per 4.1.4 - Convert from unix epoch to Gregorian epoch
199 msecs += 12219292800000;
200
201 // `time_low`
202 var tl = ((msecs & 0xfffffff) * 10000 + nsecs) % 0x100000000;
203 b[i++] = tl >>> 24 & 0xff;
204 b[i++] = tl >>> 16 & 0xff;
205 b[i++] = tl >>> 8 & 0xff;
206 b[i++] = tl & 0xff;
207
208 // `time_mid`
209 var tmh = (msecs / 0x100000000 * 10000) & 0xfffffff;
210 b[i++] = tmh >>> 8 & 0xff;
211 b[i++] = tmh & 0xff;
212
213 // `time_high_and_version`
214 b[i++] = tmh >>> 24 & 0xf | 0x10; // include version
215 b[i++] = tmh >>> 16 & 0xff;
216
217 // `clock_seq_hi_and_reserved` (Per 4.2.2 - include variant)
218 b[i++] = clockseq >>> 8 | 0x80;
219
220 // `clock_seq_low`
221 b[i++] = clockseq & 0xff;
222
223 // `node`
224 var node = options.node || _nodeId;
225 for (var n = 0; n < 6; n++) {
226 b[i + n] = node[n];
227 }
228
229 return buf ? buf : unparse(b);
230 }
231
232 // **`v4()` - Generate random UUID**
233
234 // See https://github.com/broofa/node-uuid for API details
235 function v4(options, buf, offset) {
236 // Deprecated - 'format' argument, as supported in v1.2
237 var i = buf && offset || 0;
238
239 if (typeof (options) === 'string') {
240 buf = (options === 'binary') ? new BufferClass(16) : null;
241 options = null;
242 }
243 options = options || {};
244
245 var rnds = options.random || (options.rng || _rng)();
246
247 // Per 4.4, set bits for version and `clock_seq_hi_and_reserved`
248 rnds[6] = (rnds[6] & 0x0f) | 0x40;
249 rnds[8] = (rnds[8] & 0x3f) | 0x80;
250
251 // Copy bytes to buffer, if provided
252 if (buf) {
253 for (var ii = 0; ii < 16; ii++) {
254 buf[i + ii] = rnds[ii];
255 }
256 }
257
258 return buf || unparse(rnds);
259 }
260
261 // Export public API
262 var uuid = function () {
263 return new String(v4());
264 };
265 uuid.v1 = v1;
266 uuid.v4 = v4;
267 uuid.create = v4;
268 uuid.empty = "00000000-0000-0000-0000-000000000000";
269 uuid.parse = parse;
270 uuid.unparse = unparse;
271 uuid.BufferClass = BufferClass;
272 uuid._rng = _rng;
273 uuid._mathRNG = _mathRNG;
274 uuid._nodeRNG = _nodeRNG;
275 uuid._whatwgRNG = _whatwgRNG;
276
277 return uuid;
278 });