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<?php /** * Copyright 2017 Facebook, Inc. * * You are hereby granted a non-exclusive, worldwide, royalty-free license to * use, copy, modify, and distribute this software in source code or binary * form for use in connection with the web services and APIs provided by * Facebook. * * As with any software that integrates with the Facebook platform, your use * of this software is subject to the Facebook Developer Principles and * Policies [http://developers.facebook.com/policy/]. This copyright notice * shall be included in all copies or substantial portions of the software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. * */ /** * @copyright (C) 2013 iJoomla, Inc. - All rights reserved. * @license GNU General Public License, version 2 (http://www.gnu.org/licenses/gpl-2.0.html) * @author iJoomla.com <webmaster@ijoomla.com> * @url https://www.jomsocial.com/license-agreement * The PHP code portions are distributed under the GPL license. If not otherwise stated, all images, manuals, cascading style sheets, and included JavaScript *are NOT GPL, and are released under the IJOOMLA Proprietary Use License v1.0 * More info at https://www.jomsocial.com/license-agreement */ namespace Facebook\PseudoRandomString; use Facebook\Exceptions\FacebookSDKException; use InvalidArgumentException; defined('_JEXEC') or die('Restricted access'); class PseudoRandomStringGeneratorFactory { private function __construct() { // a factory constructor should never be invoked } /** * Pseudo random string generator creation. * * @param PseudoRandomStringGeneratorInterface|string|null $generator * * @throws InvalidArgumentException If the pseudo random string generator must be set to "random_bytes", "mcrypt", "openssl", or "urandom", or be an instance of Facebook\PseudoRandomString\PseudoRandomStringGeneratorInterface. * * @return PseudoRandomStringGeneratorInterface */ public static function createPseudoRandomStringGenerator($generator) { if (!$generator) { return self::detectDefaultPseudoRandomStringGenerator(); } if ($generator instanceof PseudoRandomStringGeneratorInterface) { return $generator; } if ('random_bytes' === $generator) { return new RandomBytesPseudoRandomStringGenerator(); } if ('mcrypt' === $generator) { return new McryptPseudoRandomStringGenerator(); } if ('openssl' === $generator) { return new OpenSslPseudoRandomStringGenerator(); } if ('urandom' === $generator) { return new UrandomPseudoRandomStringGenerator(); } 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'); } /** * Detects which pseudo-random string generator to use. * * @throws FacebookSDKException If unable to detect a cryptographically secure pseudo-random string generator. * * @return PseudoRandomStringGeneratorInterface */ private static function detectDefaultPseudoRandomStringGenerator() { // Check for PHP 7's CSPRNG first to keep mcrypt deprecation messages from appearing in PHP 7.1. if (function_exists('random_bytes')) { return new RandomBytesPseudoRandomStringGenerator(); } // Since openssl_random_pseudo_bytes() can sometimes return non-cryptographically // secure pseudo-random strings (in rare cases), we check for mcrypt_create_iv() next. if (function_exists('mcrypt_create_iv')) { return new McryptPseudoRandomStringGenerator(); } if (function_exists('openssl_random_pseudo_bytes')) { return new OpenSslPseudoRandomStringGenerator(); } if (!ini_get('open_basedir') && is_readable('/dev/urandom')) { return new UrandomPseudoRandomStringGenerator(); } throw new FacebookSDKException('Unable to detect a cryptographically secure pseudo-random string generator.'); } }
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