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1<?php
2/**
3 * @license GPL-2.0-or-later
4 * @file
5 */
6
7namespace MediaWiki\Specials;
8
9use MediaWiki\HTMLForm\HTMLForm;
10use MediaWiki\SpecialPage\RedirectSpecialPage;
11use MediaWiki\Title\Title;
12
13/**
14 * Redirect from Special:Diff/### to index.php?diff=### and
15 * from Special:Diff/###/### to index.php?oldid=###&diff=###.
16 *
17 * All of the following are valid usages:
18 * - [[Special:Diff/12345]] (diff of a revision with the previous one)
19 * - [[Special:Diff/12345/prev]] (diff of a revision with the previous one as well)
20 * - [[Special:Diff/12345/next]] (diff of a revision with the next one)
21 * - [[Special:Diff/12345/cur]] (diff of a revision with the latest one of that page)
22 * - [[Special:Diff/12345/98765]] (diff between arbitrary two revisions)
23 *
24 * @ingroup SpecialPage
25 * @since 1.23
26 */
27class SpecialDiff extends RedirectSpecialPage {
28    public function __construct() {
29        parent::__construct( 'Diff' );
30        $this->mAllowedRedirectParams = [];
31    }
32
33    /**
34     * @param string|null $subpage
35     * @return Title|bool
36     */
37    public function getRedirect( $subpage ) {
38        $parts = $subpage !== null ? explode( '/', $subpage ) : [];
39
40        // Try to parse the values given, generating somewhat pretty URLs if possible
41        if ( count( $parts ) === 1 && $parts[0] !== '' ) {
42            $this->mAddedRedirectParams['diff'] = $parts[0];
43        } elseif ( count( $parts ) === 2 ) {
44            $this->mAddedRedirectParams['oldid'] = $parts[0];
45            $this->mAddedRedirectParams['diff'] = $parts[1];
46        } else {
47            return false;
48        }
49
50        return true;
51    }
52
53    protected function showNoRedirectPage() {
54        $this->addHelpLink( 'Help:Diff' );
55        $this->setHeaders();
56        $this->outputHeader();
57        $this->showForm();
58    }
59
60    private function showForm() {
61        $form = HTMLForm::factory( 'ooui', [
62            'oldid' => [
63                'name' => 'oldid',
64                'type' => 'int',
65                'label-message' => 'diff-form-oldid',
66            ],
67            'diff' => [
68                'name' => 'diff',
69                // FIXME Set the type for the other field to int - T256425
70                'type' => 'selectorother',
71                'options-messages' => [
72                    'diff-form-other-revid' => 'other',
73                    'last' => 'prev',
74                    'cur' => 'cur',
75                    'next' => 'next',
76                ],
77                'label-message' => 'diff-form-revid',
78                // Remove validation callback when using int type - T256425
79                'validation-callback' => function ( $value ) {
80                    $value = trim( $value ?? '' );
81                    if ( preg_match( '/^\d*$/', $value )
82                        || in_array( $value, [ 'prev', 'cur', 'next' ], true )
83                    ) {
84                        return true;
85                    }
86                    return $this->msg( 'diff-form-error-revid' );
87                },
88            ],
89        ], $this->getContext(), 'diff-form' );
90        $form->setSubmitTextMsg( 'diff-form-submit' );
91        $form->setSubmitCallback( $this->onFormSubmit( ... ) );
92        $form->show();
93    }
94
95    /**
96     * @param array $formData
97     */
98    private function onFormSubmit( $formData ) {
99        $params = [];
100        if ( $formData['oldid'] ) {
101            $params[] = $formData['oldid'];
102        }
103        if ( $formData['diff'] ) {
104            // Remove trim when using int type - T256425
105            $params[] = trim( $formData['diff'] );
106        }
107        $title = $this->getPageTitle( $params ? implode( '/', $params ) : null );
108        $url = $title->getFullUrlForRedirect();
109        $this->getOutput()->redirect( $url );
110    }
111
112    /** @inheritDoc */
113    public function getDescription() {
114        // 'diff' message is in lowercase, using own message
115        return $this->msg( 'diff-form' );
116    }
117
118    /** @inheritDoc */
119    public function getName() {
120        return 'diff-form';
121    }
122
123    /** @inheritDoc */
124    public function isListed() {
125        return true;
126    }
127
128    /** @inheritDoc */
129    protected function getGroupName() {
130        return 'redirects';
131    }
132}
133
134/** @deprecated class alias since 1.41 */
135class_alias( SpecialDiff::class, 'SpecialDiff' );