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1 | <?php |
2 | /** |
3 | * Functions used for decoding/encoding ids in ShortUrl Extension |
4 | * |
5 | * @file |
6 | * @ingroup Extensions |
7 | * @author Yuvi Panda, http://yuvi.in |
8 | * @copyright © 2011 Yuvaraj Pandian (yuvipanda@yuvi.in) |
9 | * @license BSD-3-Clause |
10 | */ |
11 | |
12 | namespace MediaWiki\Extension\ShortUrl; |
13 | |
14 | use MediaWiki\MediaWikiServices; |
15 | use MediaWiki\Title\Title; |
16 | |
17 | /** |
18 | * Utility functions for encoding and decoding short URLs |
19 | */ |
20 | class Utils { |
21 | |
22 | /** |
23 | * @param Title $title |
24 | * @return string|bool false if read-only mode |
25 | */ |
26 | public static function encodeTitle( Title $title ) { |
27 | global $wgShortUrlReadOnly; |
28 | |
29 | if ( $wgShortUrlReadOnly ) { |
30 | // Not creating any new ids |
31 | return false; |
32 | } |
33 | |
34 | $fname = __METHOD__; |
35 | $services = MediaWikiServices::getInstance(); |
36 | $cache = $services->getMainWANObjectCache(); |
37 | $connectionProvider = $services->getConnectionProvider(); |
38 | |
39 | return $cache->getWithSetCallback( |
40 | $cache->makeKey( 'shorturls-title', md5( $title->getPrefixedText() ) ), |
41 | $cache::TTL_MONTH, |
42 | static function () use ( $title, $fname, $connectionProvider ) { |
43 | $id = $connectionProvider->getReplicaDatabase()->newSelectQueryBuilder() |
44 | ->select( 'su_id' ) |
45 | ->from( 'shorturls' ) |
46 | ->where( [ |
47 | 'su_namespace' => $title->getNamespace(), |
48 | 'su_title' => $title->getDBkey() |
49 | ] ) |
50 | ->caller( $fname ) |
51 | ->fetchField(); |
52 | |
53 | // Automatically create an ID for this title if missing... |
54 | if ( !$id ) { |
55 | $dbw = $connectionProvider->getPrimaryDatabase(); |
56 | $dbw->newInsertQueryBuilder() |
57 | ->insertInto( 'shorturls' ) |
58 | ->ignore() |
59 | ->row( [ |
60 | 'su_namespace' => $title->getNamespace(), |
61 | 'su_title' => $title->getDBkey() |
62 | ] ) |
63 | ->caller( $fname ) |
64 | ->execute(); |
65 | |
66 | if ( $dbw->affectedRows() ) { |
67 | $id = $dbw->insertId(); |
68 | } else { |
69 | // Raced out; get the winning ID |
70 | $id = $dbw->newSelectQueryBuilder() |
71 | ->select( 'su_id' ) |
72 | ->from( 'shorturls' ) |
73 | ->where( [ |
74 | 'su_namespace' => $title->getNamespace(), |
75 | 'su_title' => $title->getDBkey() |
76 | ] ) |
77 | ->caller( $fname ) |
78 | ->lockInShareMode() |
79 | ->fetchField(); |
80 | } |
81 | } |
82 | |
83 | return base_convert( $id, 10, 36 ); |
84 | } |
85 | ); |
86 | } |
87 | |
88 | /** |
89 | * @param string|null $urlFragment |
90 | * @return Title|bool |
91 | */ |
92 | public static function decodeURL( $urlFragment ) { |
93 | if ( $urlFragment === null |
94 | || !preg_match( '/^[0-9a-z]+$/i', $urlFragment ) |
95 | ) { |
96 | return false; |
97 | } |
98 | |
99 | $id = intval( base_convert( $urlFragment, 36, 10 ) ); |
100 | |
101 | $fname = __METHOD__; |
102 | $services = MediaWikiServices::getInstance(); |
103 | $cache = $services->getMainWANObjectCache(); |
104 | $connectionProvider = $services->getConnectionProvider(); |
105 | $row = $cache->getWithSetCallback( |
106 | $cache->makeKey( 'shorturls-id', $id ), |
107 | $cache::TTL_MONTH, |
108 | static function () use ( $id, $fname, $connectionProvider ) { |
109 | $dbr = $connectionProvider->getReplicaDatabase(); |
110 | $row = $dbr->newSelectQueryBuilder() |
111 | ->select( [ 'su_namespace', 'su_title' ] ) |
112 | ->from( 'shorturls' ) |
113 | ->where( [ 'su_id' => $id ] ) |
114 | ->caller( $fname ) |
115 | ->fetchRow(); |
116 | |
117 | return $row ? (array)$row : false; |
118 | } |
119 | ); |
120 | |
121 | return $row ? Title::makeTitle( $row['su_namespace'], $row['su_title'] ) : false; |
122 | } |
123 | |
124 | /** |
125 | * @param Title $title |
126 | * @return bool true if a short URL needs to be displayed |
127 | */ |
128 | public static function needsShortUrl( $title ) { |
129 | return $title->exists() && !$title->isMainPage(); |
130 | } |
131 | } |