summaryrefslogtreecommitdiff
path: root/includes/api/ApiQueryCategoryMembers.php
blob: 704d108a0c96cfe53a0a9881c2a3b4ac9032b513 (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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
<?php
/**
 *
 *
 * Created on June 14, 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
 */

/**
 * A query module to enumerate pages that belong to a category.
 *
 * @ingroup API
 */
class ApiQueryCategoryMembers extends ApiQueryGeneratorBase {

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

	public function execute() {
		$this->run();
	}

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

	public function executeGenerator( $resultPageSet ) {
		$this->run( $resultPageSet );
	}

	/**
	 * @param $resultPageSet ApiPageSet
	 * @return void
	 */
	private function run( $resultPageSet = null ) {
		$params = $this->extractRequestParams();

		$categoryTitle = $this->getTitleOrPageId( $params )->getTitle();
		if ( $categoryTitle->getNamespace() != NS_CATEGORY ) {
			$this->dieUsage( 'The category name you entered is not valid', 'invalidcategory' );
		}

		$prop = array_flip( $params['prop'] );
		$fld_ids = isset( $prop['ids'] );
		$fld_title = isset( $prop['title'] );
		$fld_sortkey = isset( $prop['sortkey'] );
		$fld_sortkeyprefix = isset( $prop['sortkeyprefix'] );
		$fld_timestamp = isset( $prop['timestamp'] );
		$fld_type = isset( $prop['type'] );

		if ( is_null( $resultPageSet ) ) {
			$this->addFields( array( 'cl_from', 'cl_sortkey', 'cl_type', 'page_namespace', 'page_title' ) );
			$this->addFieldsIf( 'page_id', $fld_ids );
			$this->addFieldsIf( 'cl_sortkey_prefix', $fld_sortkeyprefix );
		} else {
			$this->addFields( $resultPageSet->getPageTableFields() ); // will include page_ id, ns, title
			$this->addFields( array( 'cl_from', 'cl_sortkey', 'cl_type' ) );
		}

		$this->addFieldsIf( 'cl_timestamp', $fld_timestamp || $params['sort'] == 'timestamp' );

		$this->addTables( array( 'page', 'categorylinks' ) ); // must be in this order for 'USE INDEX'

		$this->addWhereFld( 'cl_to', $categoryTitle->getDBkey() );
		$queryTypes = $params['type'];
		$contWhere = false;

		// Scanning large datasets for rare categories sucks, and I already told
		// how to have efficient subcategory access :-) ~~~~ (oh well, domas)
		global $wgMiserMode;
		$miser_ns = array();
		if ( $wgMiserMode ) {
			$miser_ns = $params['namespace'];
		} else {
			$this->addWhereFld( 'page_namespace', $params['namespace'] );
		}

		$dir = in_array( $params['dir'], array( 'asc', 'ascending', 'newer' ) ) ? 'newer' : 'older';

		if ( $params['sort'] == 'timestamp' ) {
			$this->addTimestampWhereRange( 'cl_timestamp',
				$dir,
				$params['start'],
				$params['end'] );

			$this->addOption( 'USE INDEX', 'cl_timestamp' );
		} else {
			if ( $params['continue'] ) {
				$cont = explode( '|', $params['continue'], 3 );
				$this->dieContinueUsageIf( count( $cont ) != 3 );

				// Remove the types to skip from $queryTypes
				$contTypeIndex = array_search( $cont[0], $queryTypes );
				$queryTypes = array_slice( $queryTypes, $contTypeIndex );

				// Add a WHERE clause for sortkey and from
				// pack( "H*", $foo ) is used to convert hex back to binary
				$escSortkey = $this->getDB()->addQuotes( pack( 'H*', $cont[1] ) );
				$from = intval( $cont[2] );
				$op = $dir == 'newer' ? '>' : '<';
				// $contWhere is used further down
				$contWhere = "cl_sortkey $op $escSortkey OR " .
					"(cl_sortkey = $escSortkey AND " .
					"cl_from $op= $from)";
				// The below produces ORDER BY cl_sortkey, cl_from, possibly with DESC added to each of them
				$this->addWhereRange( 'cl_sortkey', $dir, null, null );
				$this->addWhereRange( 'cl_from', $dir, null, null );
			} else {
				$startsortkey = $params['startsortkeyprefix'] !== null ?
					Collation::singleton()->getSortkey( $params['startsortkeyprefix'] ) :
					$params['startsortkey'];
				$endsortkey = $params['endsortkeyprefix'] !== null ?
					Collation::singleton()->getSortkey( $params['endsortkeyprefix'] ) :
					$params['endsortkey'];

				// The below produces ORDER BY cl_sortkey, cl_from, possibly with DESC added to each of them
				$this->addWhereRange( 'cl_sortkey',
					$dir,
					$startsortkey,
					$endsortkey );
				$this->addWhereRange( 'cl_from', $dir, null, null );
			}
			$this->addOption( 'USE INDEX', 'cl_sortkey' );
		}

		$this->addWhere( 'cl_from=page_id' );

		$limit = $params['limit'];
		$this->addOption( 'LIMIT', $limit + 1 );

		if ( $params['sort'] == 'sortkey' ) {
			// Run a separate SELECT query for each value of cl_type.
			// This is needed because cl_type is an enum, and MySQL has
			// inconsistencies between ORDER BY cl_type and
			// WHERE cl_type >= 'foo' making proper paging impossible
			// and unindexed.
			$rows = array();
			$first = true;
			foreach ( $queryTypes as $type ) {
				$extraConds = array( 'cl_type' => $type );
				if ( $first && $contWhere ) {
					// Continuation condition. Only added to the
					// first query, otherwise we'll skip things
					$extraConds[] = $contWhere;
				}
				$res = $this->select( __METHOD__, array( 'where' => $extraConds ) );
				$rows = array_merge( $rows, iterator_to_array( $res ) );
				if ( count( $rows ) >= $limit + 1 ) {
					break;
				}
				$first = false;
			}
		} else {
			// Sorting by timestamp
			// No need to worry about per-type queries because we
			// aren't sorting or filtering by type anyway
			$res = $this->select( __METHOD__ );
			$rows = iterator_to_array( $res );
		}

		$result = $this->getResult();
		$count = 0;
		foreach ( $rows as $row ) {
			if ( ++ $count > $limit ) {
				// We've reached the one extra which shows that there are additional pages to be had. Stop here...
				// TODO: Security issue - if the user has no right to view next title, it will still be shown
				if ( $params['sort'] == 'timestamp' ) {
					$this->setContinueEnumParameter( 'start', wfTimestamp( TS_ISO_8601, $row->cl_timestamp ) );
				} else {
					$sortkey = bin2hex( $row->cl_sortkey );
					$this->setContinueEnumParameter( 'continue',
						"{$row->cl_type}|$sortkey|{$row->cl_from}"
					);
				}
				break;
			}

			// Since domas won't tell anyone what he told long ago, apply
			// cmnamespace here. This means the query may return 0 actual
			// results, but on the other hand it could save returning 5000
			// useless results to the client. ~~~~
			if ( count( $miser_ns ) && !in_array( $row->page_namespace, $miser_ns ) ) {
				continue;
			}

			if ( is_null( $resultPageSet ) ) {
				$vals = array();
				if ( $fld_ids ) {
					$vals['pageid'] = intval( $row->page_id );
				}
				if ( $fld_title ) {
					$title = Title::makeTitle( $row->page_namespace, $row->page_title );
					ApiQueryBase::addTitleInfo( $vals, $title );
				}
				if ( $fld_sortkey ) {
					$vals['sortkey'] = bin2hex( $row->cl_sortkey );
				}
				if ( $fld_sortkeyprefix ) {
					$vals['sortkeyprefix'] = $row->cl_sortkey_prefix;
				}
				if ( $fld_type ) {
					$vals['type'] = $row->cl_type;
				}
				if ( $fld_timestamp ) {
					$vals['timestamp'] = wfTimestamp( TS_ISO_8601, $row->cl_timestamp );
				}
				$fit = $result->addValue( array( 'query', $this->getModuleName() ),
						null, $vals );
				if ( !$fit ) {
					if ( $params['sort'] == 'timestamp' ) {
						$this->setContinueEnumParameter( 'start', wfTimestamp( TS_ISO_8601, $row->cl_timestamp ) );
					} else {
						$sortkey = bin2hex( $row->cl_sortkey );
						$this->setContinueEnumParameter( 'continue',
							"{$row->cl_type}|$sortkey|{$row->cl_from}"
						);
					}
					break;
				}
			} else {
				$resultPageSet->processDbRow( $row );
			}
		}

		if ( is_null( $resultPageSet ) ) {
			$result->setIndexedTagName_internal(
				array( 'query', $this->getModuleName() ), 'cm' );
		}
	}

	public function getAllowedParams() {
		return array(
			'title' => array(
				ApiBase::PARAM_TYPE => 'string',
			),
			'pageid' => array(
				ApiBase::PARAM_TYPE => 'integer'
			),
			'prop' => array(
				ApiBase::PARAM_DFLT => 'ids|title',
				ApiBase::PARAM_ISMULTI => true,
				ApiBase::PARAM_TYPE => array(
					'ids',
					'title',
					'sortkey',
					'sortkeyprefix',
					'type',
					'timestamp',
				)
			),
			'namespace' => array(
				ApiBase::PARAM_ISMULTI => true,
				ApiBase::PARAM_TYPE => 'namespace',
			),
			'type' => array(
				ApiBase::PARAM_ISMULTI => true,
				ApiBase::PARAM_DFLT => 'page|subcat|file',
				ApiBase::PARAM_TYPE => array(
					'page',
					'subcat',
					'file'
				)
			),
			'continue' => null,
			'limit' => array(
				ApiBase::PARAM_TYPE => 'limit',
				ApiBase::PARAM_DFLT => 10,
				ApiBase::PARAM_MIN => 1,
				ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
				ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
			),
			'sort' => array(
				ApiBase::PARAM_DFLT => 'sortkey',
				ApiBase::PARAM_TYPE => array(
					'sortkey',
					'timestamp'
				)
			),
			'dir' => array(
				ApiBase::PARAM_DFLT => 'ascending',
				ApiBase::PARAM_TYPE => array(
					'asc',
					'desc',
					// Normalising with other modules
					'ascending',
					'descending',
					'newer',
					'older',
				)
			),
			'start' => array(
				ApiBase::PARAM_TYPE => 'timestamp'
			),
			'end' => array(
				ApiBase::PARAM_TYPE => 'timestamp'
			),
			'startsortkey' => null,
			'endsortkey' => null,
			'startsortkeyprefix' => null,
			'endsortkeyprefix' => null,
		);
	}

	public function getParamDescription() {
		global $wgMiserMode;
		$p = $this->getModulePrefix();
		$desc = array(
			'title' => "Which category to enumerate (required). Must include Category: prefix. Cannot be used together with {$p}pageid",
			'pageid' => "Page ID of the category to enumerate. Cannot be used together with {$p}title",
			'prop' => array(
				'What pieces of information to include',
				' ids           - Adds the page ID',
				' title         - Adds the title and namespace ID of the page',
				' sortkey       - Adds the sortkey used for sorting in the category (hexadecimal string)',
				' sortkeyprefix - Adds the sortkey prefix used for sorting in the category (human-readable part of the sortkey)',
				' type          - Adds the type that the page has been categorised as (page, subcat or file)',
				' timestamp     - Adds the timestamp of when the page was included',
			),
			'namespace' => 'Only include pages in these namespaces',
			'type' => "What type of category members to include. Ignored when {$p}sort=timestamp is set",
			'sort' => 'Property to sort by',
			'dir' => 'In which direction to sort',
			'start' => "Timestamp to start listing from. Can only be used with {$p}sort=timestamp",
			'end' => "Timestamp to end listing at. Can only be used with {$p}sort=timestamp",
			'startsortkey' => "Sortkey to start listing from. Must be given in binary format. Can only be used with {$p}sort=sortkey",
			'endsortkey' => "Sortkey to end listing at. Must be given in binary format. Can only be used with {$p}sort=sortkey",
			'startsortkeyprefix' => "Sortkey prefix to start listing from. Can only be used with {$p}sort=sortkey. Overrides {$p}startsortkey",
			'endsortkeyprefix' => "Sortkey prefix to end listing BEFORE (not at, if this value occurs it will not be included!). Can only be used with {$p}sort=sortkey. Overrides {$p}endsortkey",
			'continue' => 'For large categories, give the value returned from previous query',
			'limit' => 'The maximum number of pages to return.',
		);

		if ( $wgMiserMode ) {
			$desc['namespace'] = array(
				$desc['namespace'],
				"NOTE: Due to \$wgMiserMode, using this may result in fewer than \"{$p}limit\" results",
				'returned before continuing; in extreme cases, zero results may be returned.',
				"Note that you can use {$p}type=subcat or {$p}type=file instead of {$p}namespace=14 or 6.",
			);
		}
		return $desc;
	}

	public function getResultProperties() {
		return array(
			'ids' => array(
				'pageid' => 'integer'
			),
			'title' => array(
				'ns' => 'namespace',
				'title' => 'string'
			),
			'sortkey' => array(
				'sortkey' => 'string'
			),
			'sortkeyprefix' => array(
				'sortkeyprefix' => 'string'
			),
			'type' => array(
				'type' => array(
					ApiBase::PROP_TYPE => array(
						'page',
						'subcat',
						'file'
					)
				)
			),
			'timestamp' => array(
				'timestamp' => 'timestamp'
			)
		);
	}

	public function getDescription() {
		return 'List all pages in a given category';
	}

	public function getPossibleErrors() {
		return array_merge( parent::getPossibleErrors(),
			$this->getTitleOrPageIdErrorMessage(),
			array(
				array( 'code' => 'invalidcategory', 'info' => 'The category name you entered is not valid' ),
			)
		);
	}

	public function getExamples() {
		return array(
			'api.php?action=query&list=categorymembers&cmtitle=Category:Physics' => 'Get first 10 pages in [[Category:Physics]]',
			'api.php?action=query&generator=categorymembers&gcmtitle=Category:Physics&prop=info' => 'Get page info about first 10 pages in [[Category:Physics]]',
		);
	}

	public function getHelpUrls() {
		return 'https://www.mediawiki.org/wiki/API:Categorymembers';
	}
}