1<?php
2
3namespace Sabre\DAV;
4
5/**
6 * String utility
7 *
8 * This class is mainly used to implement the 'text-match' filter, used by both
9 * the CalDAV calendar-query REPORT, and CardDAV addressbook-query REPORT.
10 * Because they both need it, it was decided to put it in Sabre\DAV instead.
11 *
12 * @copyright Copyright (C) 2007-2015 fruux GmbH (https://fruux.com/).
13 * @author Evert Pot (http://evertpot.com/)
14 * @license http://sabre.io/license/ Modified BSD License
15 */
16class StringUtil {
17
18    /**
19     * Checks if a needle occurs in a haystack ;)
20     *
21     * @param string $haystack
22     * @param string $needle
23     * @param string $collation
24     * @param string $matchType
25     * @return bool
26     */
27    static function textMatch($haystack, $needle, $collation, $matchType = 'contains') {
28
29        switch ($collation) {
30
31            case 'i;ascii-casemap' :
32                // default strtolower takes locale into consideration
33                // we don't want this.
34                $haystack = str_replace(range('a', 'z'), range('A', 'Z'), $haystack);
35                $needle = str_replace(range('a', 'z'), range('A', 'Z'), $needle);
36                break;
37
38            case 'i;octet' :
39                // Do nothing
40                break;
41
42            case 'i;unicode-casemap' :
43                $haystack = mb_strtoupper($haystack, 'UTF-8');
44                $needle = mb_strtoupper($needle, 'UTF-8');
45                break;
46
47            default :
48                throw new Exception\BadRequest('Collation type: ' . $collation . ' is not supported');
49
50        }
51
52        switch ($matchType) {
53
54            case 'contains' :
55                return strpos($haystack, $needle) !== false;
56            case 'equals' :
57                return $haystack === $needle;
58            case 'starts-with' :
59                return strpos($haystack, $needle) === 0;
60            case 'ends-with' :
61                return strrpos($haystack, $needle) === strlen($haystack) - strlen($needle);
62            default :
63                throw new Exception\BadRequest('Match-type: ' . $matchType . ' is not supported');
64
65        }
66
67    }
68
69    /**
70     * This method takes an input string, checks if it's not valid UTF-8 and
71     * attempts to convert it to UTF-8 if it's not.
72     *
73     * Note that currently this can only convert ISO-8559-1 to UTF-8 (latin-1),
74     * anything else will likely fail.
75     *
76     * @param string $input
77     * @return string
78     */
79    static function ensureUTF8($input) {
80
81        $encoding = mb_detect_encoding($input, ['UTF-8', 'ISO-8859-1'], true);
82
83        if ($encoding === 'ISO-8859-1') {
84            return utf8_encode($input);
85        } else {
86            return $input;
87        }
88
89    }
90
91}
92