Dropbox\Security\RandomStringGeneratorFactory

Complexity

Total Complexity

8

Size/Duplication

Total Lines	61
Duplicated Lines	0 %

Coupling/Cohesion

Components	0
Dependencies	3

Test Coverage

Coverage

37.5%

Importance

Changes

0

2 Methods

Rating	Name	Duplication	Size	Complexity
A	makeRandomStringGenerator()	0	26	5
A	defaultRandomStringGenerator()	0	15	3

<?php
namespace Dropbox\Security;

use InvalidArgumentException;
use Dropbox\Exceptions\DropboxClientException;

/**
 * Thanks to Facebook
 *
 * @link https://developers.facebook.com/docs/php/RandomStringGeneratorInterface
 */
class RandomStringGeneratorFactory
{
    /**
     * Make a Random String Generator
     *
     * @param  null|string|\Dropbox\Security\RandomStringGeneratorInterface $generator
     *
     * @throws \Dropbox\Exceptions\DropboxClientException
     *
     * @return \Dropbox\Security\RandomStringGeneratorInterface
     */
    public static function makeRandomStringGenerator($generator = null)
    {
        //No generator provided
        if (is_null($generator)) {
            //Generate default random string generator
            return static::defaultRandomStringGenerator();
        }

        //RandomStringGeneratorInterface
        if ($generator instanceof RandomStringGeneratorInterface) {
            return $generator;
        }

        // Mcrypt
        if ('mcrypt' === $generator) {
            return new McryptRandomStringGenerator();
        }

        //OpenSSL
        if ('openssl' === $generator) {
            return new OpenSslRandomStringGenerator();
        }

        //Invalid Argument
        throw new InvalidArgumentException('The random string generator must be set to "mcrypt", "openssl" or be an instance of Dropbox\Security\RandomStringGeneratorInterface');
    }

    /**
     * Get Default Random String Generator
     *
     * @throws \Dropbox\Exceptions\DropboxClientException
     *
     * @return RandomStringGeneratorInterface
     */
    protected static function defaultRandomStringGenerator()
    {
        //Mcrypt
        if (function_exists('mcrypt_create_iv')) {
            return new McryptRandomStringGenerator();
        }

        //OpenSSL
        if (function_exists('openssl_random_pseudo_bytes')) {
            return new OpenSslRandomStringGenerator();
        }

        //Unable to create a random string generator
        throw new DropboxClientException('Unable to detect a cryptographically secure pseudo-random string generator.');
    }
}