286 lines
22 KiB
JavaScript
286 lines
22 KiB
JavaScript
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(function () {
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/* Imports */
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var Meteor = Package.meteor.Meteor;
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var _ = Package.underscore._;
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/* Package-scope variables */
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var Random;
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(function () {
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//////////////////////////////////////////////////////////////////////////////////////
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// //
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// packages/random/random.js //
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// //
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//////////////////////////////////////////////////////////////////////////////////////
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//
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// We use cryptographically strong PRNGs (crypto.getRandomBytes() on the server, // 1
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// window.crypto.getRandomValues() in the browser) when available. If these // 2
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// PRNGs fail, we fall back to the Alea PRNG, which is not cryptographically // 3
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// strong, and we seed it with various sources such as the date, Math.random, // 4
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// and window size on the client. When using crypto.getRandomValues(), our // 5
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// primitive is hexString(), from which we construct fraction(). When using // 6
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// window.crypto.getRandomValues() or alea, the primitive is fraction and we use // 7
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// that to construct hex string. // 8
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// 9
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if (Meteor.isServer) // 10
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var nodeCrypto = Npm.require('crypto'); // 11
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// 12
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// see http://baagoe.org/en/wiki/Better_random_numbers_for_javascript // 13
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// for a full discussion and Alea implementation. // 14
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var Alea = function () { // 15
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function Mash() { // 16
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var n = 0xefc8249d; // 17
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// 18
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var mash = function(data) { // 19
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data = data.toString(); // 20
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for (var i = 0; i < data.length; i++) { // 21
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n += data.charCodeAt(i); // 22
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var h = 0.02519603282416938 * n; // 23
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n = h >>> 0; // 24
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h -= n; // 25
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h *= n; // 26
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n = h >>> 0; // 27
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h -= n; // 28
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n += h * 0x100000000; // 2^32 // 29
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} // 30
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return (n >>> 0) * 2.3283064365386963e-10; // 2^-32 // 31
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}; // 32
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// 33
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mash.version = 'Mash 0.9'; // 34
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return mash; // 35
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} // 36
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// 37
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return (function (args) { // 38
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var s0 = 0; // 39
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var s1 = 0; // 40
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var s2 = 0; // 41
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var c = 1; // 42
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// 43
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if (args.length == 0) { // 44
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args = [+new Date]; // 45
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} // 46
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var mash = Mash(); // 47
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s0 = mash(' '); // 48
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s1 = mash(' '); // 49
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s2 = mash(' '); // 50
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// 51
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for (var i = 0; i < args.length; i++) { // 52
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s0 -= mash(args[i]); // 53
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if (s0 < 0) { // 54
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s0 += 1; // 55
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} // 56
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s1 -= mash(args[i]); // 57
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if (s1 < 0) { // 58
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s1 += 1; // 59
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} // 60
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s2 -= mash(args[i]); // 61
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if (s2 < 0) { // 62
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s2 += 1; // 63
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} // 64
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} // 65
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mash = null; // 66
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// 67
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var random = function() { // 68
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var t = 2091639 * s0 + c * 2.3283064365386963e-10; // 2^-32 // 69
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s0 = s1; // 70
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s1 = s2; // 71
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return s2 = t - (c = t | 0); // 72
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}; // 73
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random.uint32 = function() { // 74
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return random() * 0x100000000; // 2^32 // 75
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}; // 76
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random.fract53 = function() { // 77
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return random() + // 78
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(random() * 0x200000 | 0) * 1.1102230246251565e-16; // 2^-53 // 79
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}; // 80
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random.version = 'Alea 0.9'; // 81
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random.args = args; // 82
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return random; // 83
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// 84
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} (Array.prototype.slice.call(arguments))); // 85
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}; // 86
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// 87
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var UNMISTAKABLE_CHARS = "23456789ABCDEFGHJKLMNPQRSTWXYZabcdefghijkmnopqrstuvwxyz"; // 88
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var BASE64_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" + // 89
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"0123456789-_"; // 90
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// 91
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// If seeds are provided, then the alea PRNG will be used, since cryptographic // 92
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// PRNGs (Node crypto and window.crypto.getRandomValues) don't allow us to // 93
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// specify seeds. The caller is responsible for making sure to provide a seed // 94
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// for alea if a csprng is not available. // 95
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var RandomGenerator = function (seedArray) { // 96
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var self = this; // 97
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if (seedArray !== undefined) // 98
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self.alea = Alea.apply(null, seedArray); // 99
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}; // 100
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// 101
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RandomGenerator.prototype.fraction = function () { // 102
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var self = this; // 103
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if (self.alea) { // 104
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return self.alea(); // 105
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} else if (nodeCrypto) { // 106
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var numerator = parseInt(self.hexString(8), 16); // 107
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return numerator * 2.3283064365386963e-10; // 2^-32 // 108
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} else if (typeof window !== "undefined" && window.crypto && // 109
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window.crypto.getRandomValues) { // 110
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var array = new Uint32Array(1); // 111
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window.crypto.getRandomValues(array); // 112
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return array[0] * 2.3283064365386963e-10; // 2^-32 // 113
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} else { // 114
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throw new Error('No random generator available'); // 115
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} // 116
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}; // 117
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// 118
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RandomGenerator.prototype.hexString = function (digits) { // 119
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var self = this; // 120
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if (nodeCrypto && ! self.alea) { // 121
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var numBytes = Math.ceil(digits / 2); // 122
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var bytes; // 123
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// Try to get cryptographically strong randomness. Fall back to // 124
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// non-cryptographically strong if not available. // 125
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try { // 126
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bytes = nodeCrypto.randomBytes(numBytes); // 127
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} catch (e) { // 128
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// XXX should re-throw any error except insufficient entropy // 129
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bytes = nodeCrypto.pseudoRandomBytes(numBytes); // 130
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} // 131
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var result = bytes.toString("hex"); // 132
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// If the number of digits is odd, we'll have generated an extra 4 bits // 133
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// of randomness, so we need to trim the last digit. // 134
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return result.substring(0, digits); // 135
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} else { // 136
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var hexDigits = []; // 137
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for (var i = 0; i < digits; ++i) { // 138
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hexDigits.push(self.choice("0123456789abcdef")); // 139
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} // 140
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return hexDigits.join(''); // 141
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} // 142
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}; // 143
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// 144
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RandomGenerator.prototype._randomString = function (charsCount, // 145
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alphabet) { // 146
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var self = this; // 147
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var digits = []; // 148
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for (var i = 0; i < charsCount; i++) { // 149
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digits[i] = self.choice(alphabet); // 150
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} // 151
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return digits.join(""); // 152
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}; // 153
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// 154
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RandomGenerator.prototype.id = function (charsCount) { // 155
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var self = this; // 156
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// 17 characters is around 96 bits of entropy, which is the amount of // 157
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// state in the Alea PRNG. // 158
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if (charsCount === undefined) // 159
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charsCount = 17; // 160
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// 161
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return self._randomString(charsCount, UNMISTAKABLE_CHARS); // 162
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}; // 163
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// 164
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RandomGenerator.prototype.secret = function (charsCount) { // 165
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var self = this; // 166
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// Default to 256 bits of entropy, or 43 characters at 6 bits per // 167
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// character. // 168
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if (charsCount === undefined) // 169
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charsCount = 43; // 170
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return self._randomString(charsCount, BASE64_CHARS); // 171
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}; // 172
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// 173
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RandomGenerator.prototype.choice = function (arrayOrString) { // 174
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var index = Math.floor(this.fraction() * arrayOrString.length); // 175
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if (typeof arrayOrString === "string") // 176
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return arrayOrString.substr(index, 1); // 177
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else // 178
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return arrayOrString[index]; // 179
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}; // 180
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// 181
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// instantiate RNG. Heuristically collect entropy from various sources when a // 182
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// cryptographic PRNG isn't available. // 183
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// 184
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// client sources // 185
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var height = (typeof window !== 'undefined' && window.innerHeight) || // 186
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(typeof document !== 'undefined' // 187
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&& document.documentElement // 188
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&& document.documentElement.clientHeight) || // 189
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(typeof document !== 'undefined' // 190
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&& document.body // 191
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&& document.body.clientHeight) || // 192
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1; // 193
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// 194
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var width = (typeof window !== 'undefined' && window.innerWidth) || // 195
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(typeof document !== 'undefined' // 196
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&& document.documentElement // 197
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&& document.documentElement.clientWidth) || // 198
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(typeof document !== 'undefined' // 199
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&& document.body // 200
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&& document.body.clientWidth) || // 201
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1; // 202
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// 203
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var agent = (typeof navigator !== 'undefined' && navigator.userAgent) || ""; // 204
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// 205
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if (nodeCrypto || // 206
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(typeof window !== "undefined" && // 207
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window.crypto && window.crypto.getRandomValues)) // 208
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Random = new RandomGenerator(); // 209
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else // 210
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Random = new RandomGenerator([new Date(), height, width, agent, Math.random()]); // 211
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// 212
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Random.createWithSeeds = function () { // 213
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if (arguments.length === 0) { // 214
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throw new Error('No seeds were provided'); // 215
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} // 216
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return new RandomGenerator(arguments); // 217
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}; // 218
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// 219
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//////////////////////////////////////////////////////////////////////////////////////
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}).call(this);
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(function () {
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//////////////////////////////////////////////////////////////////////////////////////
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// //
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// packages/random/deprecated.js //
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// //
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//////////////////////////////////////////////////////////////////////////////////////
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//
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// Before this package existed, we used to use this Meteor.uuid() // 1
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// implementing the RFC 4122 v4 UUID. It is no longer documented // 2
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// and will go away. // 3
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// XXX COMPAT WITH 0.5.6 // 4
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Meteor.uuid = function () { // 5
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var HEX_DIGITS = "0123456789abcdef"; // 6
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var s = []; // 7
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for (var i = 0; i < 36; i++) { // 8
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s[i] = Random.choice(HEX_DIGITS); // 9
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} // 10
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s[14] = "4"; // 11
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s[19] = HEX_DIGITS.substr((parseInt(s[19],16) & 0x3) | 0x8, 1); // 12
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s[8] = s[13] = s[18] = s[23] = "-"; // 13
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// 14
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var uuid = s.join(""); // 15
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return uuid; // 16
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}; // 17
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// 18
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//////////////////////////////////////////////////////////////////////////////////////
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}).call(this);
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/* Exports */
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if (typeof Package === 'undefined') Package = {};
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Package.random = {
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Random: Random
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};
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})();
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//# sourceMappingURL=random.js.map
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