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<?php |
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namespace Dropbox\Security; |
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use InvalidArgumentException; |
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use Dropbox\Exceptions\DropboxClientException; |
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/** |
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* Thanks to Facebook |
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* |
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* @link https://developers.facebook.com/docs/php/RandomStringGeneratorInterface |
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*/ |
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class RandomStringGeneratorFactory |
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{ |
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/** |
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* Make a Random String Generator |
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* |
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* @param null|string|\Dropbox\Security\RandomStringGeneratorInterface $generator |
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* |
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* @throws \Dropbox\Exceptions\DropboxClientException |
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* |
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* @return \Dropbox\Security\RandomStringGeneratorInterface |
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*/ |
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public static function makeRandomStringGenerator($generator = null) |
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{ |
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//No generator provided |
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if (is_null($generator)) { |
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//Generate default random string generator |
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return static::defaultRandomStringGenerator(); |
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} |
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//RandomStringGeneratorInterface |
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if ($generator instanceof RandomStringGeneratorInterface) { |
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return $generator; |
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} |
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// Mcrypt |
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if ('mcrypt' === $generator) { |
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return new McryptRandomStringGenerator(); |
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} |
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//OpenSSL |
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if ('openssl' === $generator) { |
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return new OpenSslRandomStringGenerator(); |
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} |
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//Invalid Argument |
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throw new InvalidArgumentException('The random string generator must be set to "mcrypt", "openssl" or be an instance of Dropbox\Security\RandomStringGeneratorInterface'); |
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} |
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/** |
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* Get Default Random String Generator |
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* |
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* @throws \Dropbox\Exceptions\DropboxClientException |
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* |
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* @return RandomStringGeneratorInterface |
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*/ |
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protected static function defaultRandomStringGenerator() |
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{ |
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//Mcrypt |
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if (function_exists('mcrypt_create_iv')) { |
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return new McryptRandomStringGenerator(); |
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} |
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//OpenSSL |
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if (function_exists('openssl_random_pseudo_bytes')) { |
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return new OpenSslRandomStringGenerator(); |
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} |
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//Unable to create a random string generator |
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throw new DropboxClientException('Unable to detect a cryptographically secure pseudo-random string generator.'); |
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} |
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} |
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davidsneighbour /
dropbox-php-sdk
