includes/api/ApiQueryRevisions.php

   1 <?php
   2
   3 /*
   4  * Created on Sep 7, 2006
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 if (!defined('MEDIAWIKI')) {
  27         // Eclipse helper - will be ignored in production
  28         require_once ('ApiQueryBase.php');
  29 }
  30
  31 /**
  32  * A query action to enumerate revisions of a given page, or show top revisions of multiple pages.
  33  * Various pieces of information may be shown - flags, comments, and the actual wiki markup of the rev.
  34  * In the enumeration mode, ranges of revisions may be requested and filtered.
  35  *
  36  * @addtogroup API
  37  */
  38 class ApiQueryRevisions extends ApiQueryBase {
  39
  40         public function __construct($query, $moduleName) {
  41                 parent :: __construct($query, $moduleName, 'rv');
  42         }
  43
  44         private $fld_ids = false, $fld_flags = false, $fld_timestamp = false, $fld_size = false,
  45                         $fld_comment = false, $fld_user = false, $fld_content = false;
  46
  47         public function execute() {
  48                 $limit = $startid = $endid = $start = $end = $dir = $prop = $user = $excludeuser = null;
  49                 extract($this->extractRequestParams());
  50
  51                 // If any of those parameters are used, work in 'enumeration' mode.
  52                 // Enum mode can only be used when exactly one page is provided.
  53                 // Enumerating revisions on multiple pages make it extremelly
  54                 // difficult to manage continuations and require additional sql indexes
  55                 $enumRevMode = (!is_null($user) || !is_null($excludeuser) || !is_null($limit) || !is_null($startid) || !is_null($endid) || $dir === 'newer' || !is_null($start) || !is_null($end));
  56
  57                 $pageSet = $this->getPageSet();
  58                 $pageCount = $pageSet->getGoodTitleCount();
  59                 $revCount = $pageSet->getRevisionCount();
  60
  61                 // Optimization -- nothing to do
  62                 if ($revCount === 0 && $pageCount === 0)
  63                         return;
  64
  65                 if ($revCount > 0 && $enumRevMode)
  66                         $this->dieUsage('The revids= parameter may not be used with the list options (limit, startid, endid, dirNewer, start, end).', 'revids');
  67
  68                 if ($pageCount > 1 && $enumRevMode)
  69                         $this->dieUsage('titles, pageids or a generator was used to supply multiple pages, but the limit, startid, endid, dirNewer, user, excludeuser, start, and end parameters may only be used on a single page.', 'multpages');
  70
  71                 $this->addTables('revision');
  72                 $this->addWhere('rev_deleted=0');
  73
  74                 $prop = array_flip($prop);
  75
  76                 // These field are needed regardless of the client requesting them
  77                 $this->addFields('rev_id');
  78                 $this->addFields('rev_page');
  79
  80                 // Optional fields
  81                 $this->fld_ids = isset ($prop['ids']);
  82                 // $this->addFieldsIf('rev_text_id', $this->fld_ids); // should this be exposed?
  83                 $this->fld_flags = $this->addFieldsIf('rev_minor_edit', isset ($prop['flags']));
  84                 $this->fld_timestamp = $this->addFieldsIf('rev_timestamp', isset ($prop['timestamp']));
  85                 $this->fld_comment = $this->addFieldsIf('rev_comment', isset ($prop['comment']));
  86                 $this->fld_size = $this->addFieldsIf('rev_len', isset ($prop['size']));
  87
  88                 if (isset ($prop['user'])) {
  89                         $this->addFields('rev_user');
  90                         $this->addFields('rev_user_text');
  91                         $this->fld_user = true;
  92                 }
  93                 if (isset ($prop['content'])) {
  94
  95                         // For each page we will request, the user must have read rights for that page
  96                         foreach ($pageSet->getGoodTitles() as $title) {
  97                                 if( !$title->userCanRead() )
  98                                         $this->dieUsage(
  99                                                 'The current user is not allowed to read ' . $title->getPrefixedText(),
 100                                                 'accessdenied');
 101                         }
 102
 103                         $this->addTables('text');
 104                         $this->addWhere('rev_text_id=old_id');
 105                         $this->addFields('old_id');
 106                         $this->addFields('old_text');
 107                         $this->addFields('old_flags');
 108                         $this->fld_content = true;
 109                 }
 110
 111                 $userMax = ($this->fld_content ? 50 : 500);
 112                 $botMax = ($this->fld_content ? 200 : 10000);
 113
 114                 if ($enumRevMode) {
 115
 116                         // This is mostly to prevent parameter errors (and optimize sql?)
 117                         if (!is_null($startid) && !is_null($start))
 118                                 $this->dieUsage('start and startid cannot be used together', 'badparams');
 119
 120                         if (!is_null($endid) && !is_null($end))
 121                                 $this->dieUsage('end and endid cannot be used together', 'badparams');
 122
 123                         if(!is_null($user) && !is_null( $excludeuser))
 124                                 $this->dieUsage('user and excludeuser cannot be used together', 'badparams');
 125
 126                         // This code makes an assumption that sorting by rev_id and rev_timestamp produces
 127                         // the same result. This way users may request revisions starting at a given time,
 128                         // but to page through results use the rev_id returned after each page.
 129                         // Switching to rev_id removes the potential problem of having more than
 130                         // one row with the same timestamp for the same page.
 131                         // The order needs to be the same as start parameter to avoid SQL filesort.
 132
 133                         if (is_null($startid))
 134                                 $this->addWhereRange('rev_timestamp', $dir, $start, $end);
 135                         else
 136                                 $this->addWhereRange('rev_id', $dir, $startid, $endid);
 137
 138                         // must manually initialize unset limit
 139                         if (is_null($limit))
 140                                 $limit = 10;
 141                         $this->validateLimit('limit', $limit, 1, $userMax, $botMax);
 142
 143                         // There is only one ID, use it
 144                         $this->addWhereFld('rev_page', current(array_keys($pageSet->getGoodTitles())));
 145
 146                         if(!is_null($user)) {
 147                                 $this->addWhereFld('rev_user_text', $user);
 148                         } elseif (!is_null( $excludeuser)) {
 149                                 $this->addWhere('rev_user_text != ' . $this->getDB()->addQuotes($excludeuser));
 150                         }
 151                 }
 152                 elseif ($revCount > 0) {
 153                         $this->validateLimit('rev_count', $revCount, 1, $userMax, $botMax);
 154
 155                         // Get all revision IDs
 156                         $this->addWhereFld('rev_id', array_keys($pageSet->getRevisionIDs()));
 157
 158                         // assumption testing -- we should never get more then $revCount rows.
 159                         $limit = $revCount;
 160                 }
 161                 elseif ($pageCount > 0) {
 162                         // When working in multi-page non-enumeration mode,
 163                         // limit to the latest revision only
 164                         $this->addTables('page');
 165                         $this->addWhere('page_id=rev_page');
 166                         $this->addWhere('page_latest=rev_id');
 167                         $this->validateLimit('page_count', $pageCount, 1, $userMax, $botMax);
 168
 169                         // Get all page IDs
 170                         $this->addWhereFld('page_id', array_keys($pageSet->getGoodTitles()));
 171
 172                         // assumption testing -- we should never get more then $pageCount rows.
 173                         $limit = $pageCount;
 174                 } else
 175                         ApiBase :: dieDebug(__METHOD__, 'param validation?');
 176
 177                 $this->addOption('LIMIT', $limit +1);
 178
 179                 $data = array ();
 180                 $count = 0;
 181                 $res = $this->select(__METHOD__);
 182
 183                 $db = $this->getDB();
 184                 while ($row = $db->fetchObject($res)) {
 185
 186                         if (++ $count > $limit) {
 187                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 188                                 if (!$enumRevMode)
 189                                         ApiBase :: dieDebug(__METHOD__, 'Got more rows then expected'); // bug report
 190                                 $this->setContinueEnumParameter('startid', intval($row->rev_id));
 191                                 break;
 192                         }
 193
 194                         $this->getResult()->addValue(
 195                                 array (
 196                                         'query',
 197                                         'pages',
 198                                         intval($row->rev_page),
 199                                         'revisions'),
 200                                 null,
 201                                 $this->extractRowInfo($row));
 202                 }
 203                 $db->freeResult($res);
 204
 205                 // Ensure that all revisions are shown as '<rev>' elements
 206                 $result = $this->getResult();
 207                 if ($result->getIsRawMode()) {
 208                         $data =& $result->getData();
 209                         foreach ($data['query']['pages'] as & $page) {
 210                                 if (is_array($page) && array_key_exists('revisions', $page)) {
 211                                         $result->setIndexedTagName($page['revisions'], 'rev');
 212                                 }
 213                         }
 214                 }
 215         }
 216
 217         private function extractRowInfo($row) {
 218
 219                 $vals = array ();
 220
 221                 if ($this->fld_ids) {
 222                         $vals['revid'] = intval($row->rev_id);
 223                         // $vals['oldid'] = intval($row->rev_text_id);  // todo: should this be exposed?
 224                 }
 225
 226                 if ($this->fld_flags && $row->rev_minor_edit)
 227                         $vals['minor'] = '';
 228
 229                 if ($this->fld_user) {
 230                         $vals['user'] = $row->rev_user_text;
 231                         if (!$row->rev_user)
 232                                 $vals['anon'] = '';
 233                 }
 234
 235                 if ($this->fld_timestamp) {
 236                         $vals['timestamp'] = wfTimestamp(TS_ISO_8601, $row->rev_timestamp);
 237                 }
 238
 239                 if ($this->fld_size && !is_null($row->rev_len)) {
 240                         $vals['size'] = intval($row->rev_len);
 241                 }
 242
 243                 if ($this->fld_comment && !empty ($row->rev_comment)) {
 244                         $vals['comment'] = $row->rev_comment;
 245                 }
 246
 247                 if ($this->fld_content) {
 248                         ApiResult :: setContent($vals, Revision :: getRevisionText($row));
 249                 }
 250
 251                 return $vals;
 252         }
 253
 254         protected function getAllowedParams() {
 255                 return array (
 256                         'prop' => array (
 257                                 ApiBase :: PARAM_ISMULTI => true,
 258                                 ApiBase :: PARAM_DFLT => 'ids|timestamp|flags|comment|user',
 259                                 ApiBase :: PARAM_TYPE => array (
 260                                         'ids',
 261                                         'flags',
 262                                         'timestamp',
 263                                         'user',
 264                                         'size',
 265                                         'comment',
 266                                         'content',
 267                                 )
 268                         ),
 269                         'limit' => array (
 270                                 ApiBase :: PARAM_TYPE => 'limit',
 271                                 ApiBase :: PARAM_MIN => 1,
 272                                 ApiBase :: PARAM_MAX => ApiBase :: LIMIT_SML1,
 273                                 ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_SML2
 274                         ),
 275                         'startid' => array (
 276                                 ApiBase :: PARAM_TYPE => 'integer'
 277                         ),
 278                         'endid' => array (
 279                                 ApiBase :: PARAM_TYPE => 'integer'
 280                         ),
 281                         'start' => array (
 282                                 ApiBase :: PARAM_TYPE => 'timestamp'
 283                         ),
 284                         'end' => array (
 285                                 ApiBase :: PARAM_TYPE => 'timestamp'
 286                         ),
 287                         'dir' => array (
 288                                 ApiBase :: PARAM_DFLT => 'older',
 289                                 ApiBase :: PARAM_TYPE => array (
 290                                         'newer',
 291                                         'older'
 292                                 )
 293                         ),
 294                         'user' => array(
 295                                 ApiBase :: PARAM_TYPE => 'user'
 296                         ),
 297                         'excludeuser' => array(
 298                                 ApiBase :: PARAM_TYPE => 'user'
 299                         )
 300                 );
 301         }
 302
 303         protected function getParamDescription() {
 304                 return array (
 305                         'prop' => 'Which properties to get for each revision.',
 306                         'limit' => 'limit how many revisions will be returned (enum)',
 307                         'startid' => 'from which revision id to start enumeration (enum)',
 308                         'endid' => 'stop revision enumeration on this revid (enum)',
 309                         'start' => 'from which revision timestamp to start enumeration (enum)',
 310                         'end' => 'enumerate up to this timestamp (enum)',
 311                         'dir' => 'direction of enumeration - towards "newer" or "older" revisions (enum)',
 312                         'user' => 'only include revisions made by user',
 313                         'excludeuser' => 'exclude revisions made by user',
 314                 );
 315         }
 316
 317         protected function getDescription() {
 318                 return array (
 319                         'Get revision information.',
 320                         'This module may be used in several ways:',
 321                         ' 1) Get data about a set of pages (last revision), by setting titles or pageids parameter.',
 322                         ' 2) Get revisions for one given page, by using titles/pageids with start/end/limit params.',
 323                         ' 3) Get data about a set of revisions by setting their IDs with revids parameter.',
 324                         'All parameters marked as (enum) may only be used with a single page (#2).'
 325                 );
 326         }
 327
 328         protected function getExamples() {
 329                 return array (
 330                         'Get data with content for the last revision of titles "API" and "Main Page":',
 331                         '  api.php?action=query&prop=revisions&titles=API|Main%20Page&rvprop=timestamp|user|comment|content',
 332                         'Get last 5 revisions of the "Main Page":',
 333                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment',
 334                         'Get first 5 revisions of the "Main Page":',
 335                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer',
 336                         'Get first 5 revisions of the "Main Page" made after 2006-05-01:',
 337                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer&rvstart=20060501000000',
 338                         'Get first 5 revisions of the "Main Page" that were not made made by anonymous user "127.0.0.1"',
 339                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvexcludeuser=127.0.0.1',
 340                         'Get first 5 revisions of the "Main Page" that were made by the user "MediaWiki default"',
 341                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvuser=MediaWiki%20default',
 342                 );
 343         }
 344
 345         public function getVersion() {
 346                 return __CLASS__ . ': $Id$';
 347         }
 348 }
 349