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
44namespace SimplePie\Cache;
45
46/**
47 * Creating a cache filename with callables
48 *
49 * @package SimplePie
50 * @subpackage Caching
51 */
52final 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}
90