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1<?php
2/**
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
16 * http://www.gnu.org/copyleft/gpl.html
17 *
18 * @file
19 */
20
21namespace MediaWiki\Specials;
22
23use MediaWiki\HTMLForm\HTMLForm;
24use MediaWiki\SpecialPage\RedirectSpecialPage;
25use MediaWiki\Title\Title;
26
27/**
28 * Redirect from Special:Diff/### to index.php?diff=### and
29 * from Special:Diff/###/### to index.php?oldid=###&diff=###.
30 *
31 * All of the following are valid usages:
32 * - [[Special:Diff/12345]] (diff of a revision with the previous one)
33 * - [[Special:Diff/12345/prev]] (diff of a revision with the previous one as well)
34 * - [[Special:Diff/12345/next]] (diff of a revision with the next one)
35 * - [[Special:Diff/12345/cur]] (diff of a revision with the latest one of that page)
36 * - [[Special:Diff/12345/98765]] (diff between arbitrary two revisions)
37 *
38 * @ingroup SpecialPage
39 * @since 1.23
40 */
41class SpecialDiff extends RedirectSpecialPage {
42    public function __construct() {
43        parent::__construct( 'Diff' );
44        $this->mAllowedRedirectParams = [];
45    }
46
47    /**
48     * @param string|null $subpage
49     * @return Title|bool
50     */
51    public function getRedirect( $subpage ) {
52        $parts = $subpage !== null ? explode( '/', $subpage ) : [];
53
54        // Try to parse the values given, generating somewhat pretty URLs if possible
55        if ( count( $parts ) === 1 && $parts[0] !== '' ) {
56            $this->mAddedRedirectParams['diff'] = $parts[0];
57        } elseif ( count( $parts ) === 2 ) {
58            $this->mAddedRedirectParams['oldid'] = $parts[0];
59            $this->mAddedRedirectParams['diff'] = $parts[1];
60        } else {
61            return false;
62        }
63
64        return true;
65    }
66
67    protected function showNoRedirectPage() {
68        $this->addHelpLink( 'Help:Diff' );
69        $this->setHeaders();
70        $this->outputHeader();
71        $this->showForm();
72    }
73
74    private function showForm() {
75        $form = HTMLForm::factory( 'ooui', [
76            'oldid' => [
77                'name' => 'oldid',
78                'type' => 'int',
79                'label-message' => 'diff-form-oldid',
80            ],
81            'diff' => [
82                'name' => 'diff',
83                // FIXME Set the type for the other field to int - T256425
84                'type' => 'selectorother',
85                'options-messages' => [
86                    'diff-form-other-revid' => 'other',
87                    'last' => 'prev',
88                    'cur' => 'cur',
89                    'next' => 'next',
90                ],
91                'label-message' => 'diff-form-revid',
92                // Remove validation callback when using int type - T256425
93                'validation-callback' => function ( $value ) {
94                    $value = trim( $value ?? '' );
95                    if ( preg_match( '/^\d*$/', $value )
96                        || in_array( $value, [ 'prev', 'cur', 'next' ], true )
97                    ) {
98                        return true;
99                    }
100                    return $this->msg( 'diff-form-error-revid' );
101                },
102            ],
103        ], $this->getContext(), 'diff-form' );
104        $form->setSubmitTextMsg( 'diff-form-submit' );
105        $form->setSubmitCallback( [ $this, 'onFormSubmit' ] );
106        $form->show();
107    }
108
109    public function onFormSubmit( $formData ) {
110        $params = [];
111        if ( $formData['oldid'] ) {
112            $params[] = $formData['oldid'];
113        }
114        if ( $formData['diff'] ) {
115            // Remove trim when using int type - T256425
116            $params[] = trim( $formData['diff'] );
117        }
118        $title = $this->getPageTitle( $params ? implode( '/', $params ) : null );
119        $url = $title->getFullUrlForRedirect();
120        $this->getOutput()->redirect( $url );
121    }
122
123    public function getDescription() {
124        // 'diff' message is in lowercase, using own message
125        return $this->msg( 'diff-form' );
126    }
127
128    public function getName() {
129        return 'diff-form';
130    }
131
132    public function isListed() {
133        return true;
134    }
135
136    protected function getGroupName() {
137        return 'redirects';
138    }
139}
140
141/** @deprecated class alias since 1.41 */
142class_alias( SpecialDiff::class, 'SpecialDiff' );