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Filename : base64id.js
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/*!
 * 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 <http://socket.io>)
 */

Base64Id.prototype.generateId = function () {
  var rand = Buffer.alloc(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();