1 | var crypto = require('crypto');
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2 |
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3 | const RANDOM_BATCH_SIZE = 256;
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4 |
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5 | var randomIndex;
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6 | var randomBytes;
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7 |
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8 | var getNextRandomValue = function() {
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9 | if (randomIndex === undefined || randomIndex >= randomBytes.length) {
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10 | randomIndex = 0;
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11 | randomBytes = crypto.randomBytes(RANDOM_BATCH_SIZE);
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12 | }
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13 |
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14 | var result = randomBytes[randomIndex];
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15 | randomIndex += 1;
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16 |
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17 | return result;
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18 | };
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19 |
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20 |
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21 | var randomNumber = function(max) {
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22 |
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23 | var rand = getNextRandomValue();
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24 | while (rand >= 256 - (256 % max)) {
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25 | rand = getNextRandomValue();
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26 | }
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27 | return rand % max;
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28 | };
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29 |
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30 |
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31 | var lowercase = 'abcdefghijklmnopqrstuvwxyz',
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32 | uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
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33 | numbers = '0123456789',
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34 | symbols = '!@#$%^&*()+_-=}{[]|:;"/?.><,`~',
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35 | similarCharacters = /[ilLI|`oO0]/g,
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36 | strictRules = [
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37 | { name: 'lowercase', rule: /[a-z]/ },
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38 | { name: 'uppercase', rule: /[A-Z]/ },
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39 | { name: 'numbers', rule: /[0-9]/ },
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40 | { name: 'symbols', rule: /[!@#$%^&*()+_\-=}{[\]|:;"/?.><,`~]/ }
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41 | ];
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42 |
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43 | var generate = function(options, pool) {
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44 | var password = '',
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45 | optionsLength = options.length,
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46 | poolLength = pool.length;
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47 |
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48 | for (var i = 0; i < optionsLength; i++) {
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49 | password += pool[randomNumber(poolLength)];
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50 | }
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51 |
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52 | if (options.strict) {
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53 |
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54 | var fitsRules = strictRules.every(function(rule) {
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55 |
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56 | if (options[rule.name] == false) return true;
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57 |
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58 |
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59 | if (rule.name === 'symbols' && typeof options[rule.name] === 'string') {
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60 |
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61 | var re = new RegExp('['+options[rule.name]+']');
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62 | return re.test(password);
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63 | }
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64 |
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65 |
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66 |
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67 | return rule.rule.test(password);
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68 | });
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69 |
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70 |
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71 | if (!fitsRules) return generate(options, pool);
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72 | }
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73 |
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74 | return password;
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75 | };
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76 |
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77 |
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78 | module.exports.generate = function(options) {
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79 |
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80 | options = options || {};
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81 | if (!Object.prototype.hasOwnProperty.call(options, 'length')) options.length = 10;
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82 | if (!Object.prototype.hasOwnProperty.call(options, 'numbers')) options.numbers = false;
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83 | if (!Object.prototype.hasOwnProperty.call(options, 'symbols')) options.symbols = false;
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84 | if (!Object.prototype.hasOwnProperty.call(options, 'exclude')) options.exclude = '';
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85 | if (!Object.prototype.hasOwnProperty.call(options, 'uppercase')) options.uppercase = true;
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86 | if (!Object.prototype.hasOwnProperty.call(options, 'lowercase')) options.lowercase = true;
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87 | if (!Object.prototype.hasOwnProperty.call(options, 'excludeSimilarCharacters')) options.excludeSimilarCharacters = false;
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88 | if (!Object.prototype.hasOwnProperty.call(options, 'strict')) options.strict = false;
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89 |
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90 | if (options.strict) {
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91 | var minStrictLength = 1 + (options.numbers ? 1 : 0) + (options.symbols ? 1 : 0) + (options.uppercase ? 1 : 0);
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92 | if (minStrictLength > options.length) {
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93 | throw new TypeError('Length must correlate with strict guidelines');
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94 | }
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95 | }
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96 |
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97 |
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98 | var pool = '';
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99 |
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100 |
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101 | if (options.lowercase) {
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102 | pool += lowercase;
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103 | }
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104 |
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105 |
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106 | if (options.uppercase) {
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107 | pool += uppercase;
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108 | }
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109 |
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110 | if (options.numbers) {
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111 | pool += numbers;
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112 | }
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113 |
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114 | if (options.symbols) {
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115 | if (typeof options.symbols === 'string') {
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116 | pool += options.symbols;
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117 | } else {
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118 | pool += symbols;
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119 | }
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120 | }
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121 |
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122 |
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123 | if (!pool) {
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124 | throw new TypeError('At least one rule for pools must be true');
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125 | }
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126 |
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127 |
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128 | if (options.excludeSimilarCharacters) {
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129 | pool = pool.replace(similarCharacters, '');
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130 | }
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131 |
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132 |
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133 | var i = options.exclude.length;
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134 | while (i--) {
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135 | pool = pool.replace(options.exclude[i], '');
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136 | }
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137 |
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138 | var password = generate(options, pool);
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139 |
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140 | return password;
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141 | };
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142 |
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143 |
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144 | module.exports.generateMultiple = function(amount, options) {
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145 | var passwords = [];
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146 |
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147 | for (var i = 0; i < amount; i++) {
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148 | passwords[i] = module.exports.generate(options);
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149 | }
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150 |
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151 | return passwords;
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152 | };
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