From 67fdec20726e48ba3a934cb25bb30d47ec4a4f29 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Yaroslav=20De=20La=20Pe=C3=B1a=20Smirnov?= Date: Wed, 29 Nov 2017 11:44:34 +0300 Subject: Initial commit, version 0.5.3 --- node_modules/base64id/lib/base64id.js | 103 ++++++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100644 node_modules/base64id/lib/base64id.js (limited to 'node_modules/base64id/lib') diff --git a/node_modules/base64id/lib/base64id.js b/node_modules/base64id/lib/base64id.js new file mode 100644 index 0000000..f688159 --- /dev/null +++ b/node_modules/base64id/lib/base64id.js @@ -0,0 +1,103 @@ +/*! + * base64id v0.1.0 + */ + +/** + * Module dependencies + */ + +var crypto = require('crypto'); + +/** + * Constructor + */ + +var Base64Id = function() { }; + +/** + * Get random bytes + * + * Uses a buffer if available, falls back to crypto.randomBytes + */ + +Base64Id.prototype.getRandomBytes = function(bytes) { + + var BUFFER_SIZE = 4096 + var self = this; + + bytes = bytes || 12; + + if (bytes > BUFFER_SIZE) { + return crypto.randomBytes(bytes); + } + + var bytesInBuffer = parseInt(BUFFER_SIZE/bytes); + var threshold = parseInt(bytesInBuffer*0.85); + + if (!threshold) { + return crypto.randomBytes(bytes); + } + + if (this.bytesBufferIndex == null) { + this.bytesBufferIndex = -1; + } + + if (this.bytesBufferIndex == bytesInBuffer) { + this.bytesBuffer = null; + this.bytesBufferIndex = -1; + } + + // No buffered bytes available or index above threshold + if (this.bytesBufferIndex == -1 || this.bytesBufferIndex > threshold) { + + if (!this.isGeneratingBytes) { + this.isGeneratingBytes = true; + crypto.randomBytes(BUFFER_SIZE, function(err, bytes) { + self.bytesBuffer = bytes; + self.bytesBufferIndex = 0; + self.isGeneratingBytes = false; + }); + } + + // Fall back to sync call when no buffered bytes are available + if (this.bytesBufferIndex == -1) { + return crypto.randomBytes(bytes); + } + } + + var result = this.bytesBuffer.slice(bytes*this.bytesBufferIndex, bytes*(this.bytesBufferIndex+1)); + this.bytesBufferIndex++; + + return result; +} + +/** + * Generates a base64 id + * + * (Original version from socket.io ) + */ + +Base64Id.prototype.generateId = function () { + var rand = new Buffer(15); // multiple of 3 for base64 + if (!rand.writeInt32BE) { + return Math.abs(Math.random() * Math.random() * Date.now() | 0).toString() + + Math.abs(Math.random() * Math.random() * Date.now() | 0).toString(); + } + this.sequenceNumber = (this.sequenceNumber + 1) | 0; + rand.writeInt32BE(this.sequenceNumber, 11); + if (crypto.randomBytes) { + this.getRandomBytes(12).copy(rand); + } else { + // not secure for node 0.4 + [0, 4, 8].forEach(function(i) { + rand.writeInt32BE(Math.random() * Math.pow(2, 32) | 0, i); + }); + } + return rand.toString('base64').replace(/\//g, '_').replace(/\+/g, '-'); +}; + +/** + * Export + */ + +exports = module.exports = new Base64Id(); -- cgit v1.2.3