summaryrefslogtreecommitdiff
path: root/includes/api/ApiQueryExternalLinks.php
blob: 9529762802597e07ac08fd80ea8ce7ff9b288635 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
<?php
/**
 *
 *
 * Created on May 13, 2007
 *
 * Copyright © 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

if ( !defined( 'MEDIAWIKI' ) ) {
	// Eclipse helper - will be ignored in production
	require_once( "ApiQueryBase.php" );
}

/**
 * A query module to list all external URLs found on a given set of pages.
 *
 * @ingroup API
 */
class ApiQueryExternalLinks extends ApiQueryBase {

	public function __construct( $query, $moduleName ) {
		parent::__construct( $query, $moduleName, 'el' );
	}

	public function execute() {
		if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
			return;
		}

		$params = $this->extractRequestParams();

		$query = $params['query'];
		$protocol = ApiQueryExtLinksUsage::getProtocolPrefix( $params['protocol'] );

		$this->addFields( array(
			'el_from',
			'el_to'
		) );

		$this->addTables( 'externallinks' );
		$this->addWhereFld( 'el_from', array_keys( $this->getPageSet()->getGoodTitles() ) );

		$whereQuery = $this->prepareUrlQuerySearchString( $query, $protocol );

		if ( $whereQuery !== null ) {
			$this->addWhere( $whereQuery );
		}

		// Don't order by el_from if it's constant in the WHERE clause
		if ( count( $this->getPageSet()->getGoodTitles() ) != 1 ) {
			$this->addOption( 'ORDER BY', 'el_from' );
		}

		// If we're querying all protocols, use DISTINCT to avoid repeating protocol-relative links twice
		if ( $protocol === null ) {
			$this->addOption( 'DISTINCT' );
		}

		$this->addOption( 'LIMIT', $params['limit'] + 1 );
		$offset = isset( $params['offset'] ) ? $params['offset'] : 0;
		if ( $offset ) {
			$this->addOption( 'OFFSET', $params['offset'] );
		}

		$res = $this->select( __METHOD__ );

		$count = 0;
		foreach ( $res as $row ) {
			if ( ++$count > $params['limit'] ) {
				// We've reached the one extra which shows that
				// there are additional pages to be had. Stop here...
				$this->setContinueEnumParameter( 'offset', $offset + $params['limit'] );
				break;
			}
			$entry = array();
			// We *could* run this through wfExpandUrl() but I think it's better to output the link verbatim, even if it's protocol-relative --Roan
			ApiResult::setContent( $entry, $row->el_to );
			$fit = $this->addPageSubItem( $row->el_from, $entry );
			if ( !$fit ) {
				$this->setContinueEnumParameter( 'offset', $offset + $count - 1 );
				break;
			}
		}
	}

	public function getCacheMode( $params ) {
		return 'public';
	}

	public function getAllowedParams() {
		return array(
			'limit' => array(
				ApiBase::PARAM_DFLT => 10,
				ApiBase::PARAM_TYPE => 'limit',
				ApiBase::PARAM_MIN => 1,
				ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
				ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
			),
			'offset' => array(
				ApiBase::PARAM_TYPE => 'integer'
			),
			'protocol' => array(
				ApiBase::PARAM_TYPE => ApiQueryExtLinksUsage::prepareProtocols(),
				ApiBase::PARAM_DFLT => '',
			),
			'query' => null,
		);
	}

	public function getParamDescription() {
		$p = $this->getModulePrefix();
		return array(
			'limit' => 'How many links to return',
			'offset' => 'When more results are available, use this to continue',
			'protocol' => array(
				"Protocol of the url. If empty and {$p}query set, the protocol is http.",
				"Leave both this and {$p}query empty to list all external links"
			),
			'query' => 'Search string without protocol. Useful for checking whether a certain page contains a certain external url',
		);
	}

	public function getDescription() {
		return 'Returns all external urls (not interwikies) from the given page(s)';
	}

	public function getPossibleErrors() {
		return array_merge( parent::getPossibleErrors(), array(
			array( 'code' => 'bad_query', 'info' => 'Invalid query' ),
		) );
	}

	protected function getExamples() {
		return array(
			'Get a list of external links on the [[Main Page]]:',
			'  api.php?action=query&prop=extlinks&titles=Main%20Page',
		);
	}

	public function getHelpUrls() {
		return 'https://www.mediawiki.org/wiki/API:Properties#extlinks_.2F_el';
	}

	public function getVersion() {
		return __CLASS__ . ': $Id$';
	}
}