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   1  <?php
   2  /**
   3   * SimplePie
   4   *
   5   * A PHP-Based RSS and Atom Feed Framework.
   6   * Takes the hard work out of managing a complete RSS/Atom solution.
   7   *
   8   * Copyright (c) 2004-2022, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors
   9   * All rights reserved.
  10   *
  11   * Redistribution and use in source and binary forms, with or without modification, are
  12   * permitted provided that the following conditions are met:
  13   *
  14   *     * Redistributions of source code must retain the above copyright notice, this list of
  15   *       conditions and the following disclaimer.
  16   *
  17   *     * Redistributions in binary form must reproduce the above copyright notice, this list
  18   *       of conditions and the following disclaimer in the documentation and/or other materials
  19   *       provided with the distribution.
  20   *
  21   *     * Neither the name of the SimplePie Team nor the names of its contributors may be used
  22   *       to endorse or promote products derived from this software without specific prior
  23   *       written permission.
  24   *
  25   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
  26   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  27   * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
  28   * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  30   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  32   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  33   * POSSIBILITY OF SUCH DAMAGE.
  34   *
  35   * @package SimplePie
  36   * @copyright 2004-2022 Ryan Parman, Sam Sneddon, Ryan McCue
  37   * @author Ryan Parman
  38   * @author Sam Sneddon
  39   * @author Ryan McCue
  40   * @link http://simplepie.org/ SimplePie
  41   * @license http://www.opensource.org/licenses/bsd-license.php BSD License
  42   */
  43  
  44  namespace SimplePie\Cache;
  45  
  46  /**
  47   * Creating a cache filename with callables
  48   *
  49   * @package SimplePie
  50   * @subpackage Caching
  51   */
  52  final class CallableNameFilter implements NameFilter
  53  {
  54      /**
  55       * @var callable
  56       */
  57      private $callable;
  58  
  59      public function __construct(callable $callable)
  60      {
  61          $this->callable = $callable;
  62      }
  63  
  64      /**
  65       * Method to create cache filename with.
  66       *
  67       * The returning name MUST follow the rules for keys in PSR-16.
  68       *
  69       * @link https://www.php-fig.org/psr/psr-16/
  70       *
  71       * The returning name MUST be a string of at least one character
  72       * that uniquely identifies a cached item, MUST only contain the
  73       * characters A-Z, a-z, 0-9, _, and . in any order in UTF-8 encoding
  74       * and MUST not longer then 64 characters. The following characters
  75       * are reserved for future extensions and MUST NOT be used: {}()/\@:
  76       *
  77       * A provided implementing library MAY support additional characters
  78       * and encodings or longer lengths, but MUST support at least that
  79       * minimum.
  80       *
  81       * @param string $name The name for the cache will be most likly an url with query string
  82       *
  83       * @return string the new cache name
  84       */
  85      public function filter(string $name): string
  86      {
  87          return call_user_func($this->callable, $name);
  88      }
  89  }