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<?php |
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/** |
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* Copyright 2017 Facebook, Inc. |
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* |
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* You are hereby granted a non-exclusive, worldwide, royalty-free license to |
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* use, copy, modify, and distribute this software in source code or binary |
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* form for use in connection with the web services and APIs provided by |
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* Facebook. |
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* |
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* As with any software that integrates with the Facebook platform, your use |
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* of this software is subject to the Facebook Developer Principles and |
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* Policies [http://developers.facebook.com/policy/]. This copyright notice |
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* shall be included in all copies or substantial portions of the software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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* DEALINGS IN THE SOFTWARE. |
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* |
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*/ |
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namespace Facebook\PseudoRandomString; |
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use Facebook\Exceptions\FacebookSDKException; |
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use InvalidArgumentException; |
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class PseudoRandomStringGeneratorFactory |
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{ |
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private function __construct() |
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{ |
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// a factory constructor should never be invoked |
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} |
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/** |
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* Pseudo random string generator creation. |
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* |
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* @param PseudoRandomStringGeneratorInterface|string|null $generator |
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* |
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* @throws InvalidArgumentException If the pseudo random string generator must be set to "random_bytes", "mcrypt", "openssl", or "urandom", or be an instance of Facebook\PseudoRandomString\PseudoRandomStringGeneratorInterface. |
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* |
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* @return PseudoRandomStringGeneratorInterface |
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*/ |
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public static function createPseudoRandomStringGenerator($generator) |
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{ |
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if (!$generator) { |
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return self::detectDefaultPseudoRandomStringGenerator(); |
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} |
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if ($generator instanceof PseudoRandomStringGeneratorInterface) { |
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return $generator; |
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} |
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if ('random_bytes' === $generator) { |
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return new RandomBytesPseudoRandomStringGenerator(); |
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} |
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if ('mcrypt' === $generator) { |
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return new McryptPseudoRandomStringGenerator(); |
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} |
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if ('openssl' === $generator) { |
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return new OpenSslPseudoRandomStringGenerator(); |
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} |
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if ('urandom' === $generator) { |
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return new UrandomPseudoRandomStringGenerator(); |
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} |
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throw new InvalidArgumentException('The pseudo random string generator must be set to "random_bytes", "mcrypt", "openssl", or "urandom", or be an instance of Facebook\PseudoRandomString\PseudoRandomStringGeneratorInterface'); |
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} |
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/** |
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* Detects which pseudo-random string generator to use. |
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* |
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* @throws FacebookSDKException If unable to detect a cryptographically secure pseudo-random string generator. |
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* |
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* @return PseudoRandomStringGeneratorInterface |
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*/ |
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private static function detectDefaultPseudoRandomStringGenerator() |
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{ |
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// Check for PHP 7's CSPRNG first to keep mcrypt deprecation messages from appearing in PHP 7.1. |
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if (function_exists('random_bytes')) { |
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return new RandomBytesPseudoRandomStringGenerator(); |
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} |
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// Since openssl_random_pseudo_bytes() can sometimes return non-cryptographically |
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// secure pseudo-random strings (in rare cases), we check for mcrypt_create_iv() next. |
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if (function_exists('mcrypt_create_iv')) { |
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return new McryptPseudoRandomStringGenerator(); |
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} |
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if (function_exists('openssl_random_pseudo_bytes')) { |
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return new OpenSslPseudoRandomStringGenerator(); |
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} |
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if (!ini_get('open_basedir') && is_readable('/dev/urandom')) { |
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return new UrandomPseudoRandomStringGenerator(); |
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} |
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throw new FacebookSDKException('Unable to detect a cryptographically secure pseudo-random string generator.'); |
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} |
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} |
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JuKu /
JuKuCMS
