102 lines
4.0 KiB
PHP
102 lines
4.0 KiB
PHP
<?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.
|
|
*
|
|
*/
|
|
namespace Facebook\PseudoRandomString;
|
|
|
|
use Facebook\Exceptions\FacebookSDKException;
|
|
use InvalidArgumentException;
|
|
|
|
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.');
|
|
}
|
|
}
|