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
  58                 $pageSet = $this->getPageSet();
  59                 $pageCount = $pageSet->getGoodTitleCount();
  60                 $revCount = $pageSet->getRevisionCount();
  61
  62                 // Optimization -- nothing to do
  63                 if ($revCount === 0 && $pageCount === 0)
  64                         return;
  65
  66                 if ($revCount > 0 && $enumRevMode)
  67                         $this->dieUsage('The revids= parameter may not be used with the list options (limit, startid, endid, dirNewer, start, end).', 'revids');
  68
  69                 if ($pageCount > 1 && $enumRevMode)
  70                         $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');
  71
  72                 $this->addTables('revision');
  73                 $this->addWhere('rev_deleted=0');
  74
  75                 $prop = array_flip($prop);
  76
  77                 // These field are needed regardless of the client requesting them
  78                 $this->addFields('rev_id');
  79                 $this->addFields('rev_page');
  80
  81                 // Optional fields
  82                 $this->fld_ids = isset ($prop['ids']);
  83                 // $this->addFieldsIf('rev_text_id', $this->fld_ids); // should this be exposed?
  84                 $this->fld_flags = $this->addFieldsIf('rev_minor_edit', isset ($prop['flags']));
  85                 $this->fld_timestamp = $this->addFieldsIf('rev_timestamp', isset ($prop['timestamp']));
  86                 $this->fld_comment = $this->addFieldsIf('rev_comment', isset ($prop['comment']));
  87                 $this->fld_size = $this->addFieldsIf('rev_len', isset ($prop['size']));
  88
  89                 if (isset ($prop['user'])) {
  90                         $this->addFields('rev_user');
  91                         $this->addFields('rev_user_text');
  92                         $this->fld_user = true;
  93                 }
  94                 if (isset ($prop['content'])) {
  95
  96                         // For each page we will request, the user must have read rights for that page
  97                         foreach ($pageSet->getGoodTitles() as $title) {
  98                                 if( !$title->userCanRead() )
  99                                         $this->dieUsage(
 100                                                 'The current user is not allowed to read ' . $title->getPrefixedText(),
 101                                                 'accessdenied');
 102                         }
 103
 104                         $this->addTables('text');
 105                         $this->addWhere('rev_text_id=old_id');
 106                         $this->addFields('old_id');
 107                         $this->addFields('old_text');
 108                         $this->addFields('old_flags');
 109
 110                         $this->fld_content = true;
 111
 112                         $this->expandTemplates = $expandtemplates;
 113                 }
 114
 115                 $userMax = ($this->fld_content ? 50 : 500);
 116                 $botMax = ($this->fld_content ? 200 : 10000);
 117
 118                 if ($enumRevMode) {
 119
 120                         // This is mostly to prevent parameter errors (and optimize sql?)
 121                         if (!is_null($startid) && !is_null($start))
 122                                 $this->dieUsage('start and startid cannot be used together', 'badparams');
 123
 124                         if (!is_null($endid) && !is_null($end))
 125                                 $this->dieUsage('end and endid cannot be used together', 'badparams');
 126
 127                         if(!is_null($user) && !is_null( $excludeuser))
 128                                 $this->dieUsage('user and excludeuser cannot be used together', 'badparams');
 129
 130                         // This code makes an assumption that sorting by rev_id and rev_timestamp produces
 131                         // the same result. This way users may request revisions starting at a given time,
 132                         // but to page through results use the rev_id returned after each page.
 133                         // Switching to rev_id removes the potential problem of having more than
 134                         // one row with the same timestamp for the same page.
 135                         // The order needs to be the same as start parameter to avoid SQL filesort.
 136
 137                         if (is_null($startid) && is_null($endid))
 138                                 $this->addWhereRange('rev_timestamp', $dir, $start, $end);
 139                         else
 140                                 $this->addWhereRange('rev_id', $dir, $startid, $endid);
 141
 142                         // must manually initialize unset limit
 143                         if (is_null($limit))
 144                                 $limit = 10;
 145                         $this->validateLimit('limit', $limit, 1, $userMax, $botMax);
 146
 147                         // There is only one ID, use it
 148                         $this->addWhereFld('rev_page', current(array_keys($pageSet->getGoodTitles())));
 149
 150                         if(!is_null($user)) {
 151                                 $this->addWhereFld('rev_user_text', $user);
 152                         } elseif (!is_null( $excludeuser)) {
 153                                 $this->addWhere('rev_user_text != ' . $this->getDB()->addQuotes($excludeuser));
 154                         }
 155                 }
 156                 elseif ($revCount > 0) {
 157                         $this->validateLimit('rev_count', $revCount, 1, $userMax, $botMax);
 158
 159                         // Get all revision IDs
 160                         $this->addWhereFld('rev_id', array_keys($pageSet->getRevisionIDs()));
 161
 162                         // assumption testing -- we should never get more then $revCount rows.
 163                         $limit = $revCount;
 164                 }
 165                 elseif ($pageCount > 0) {
 166                         // When working in multi-page non-enumeration mode,
 167                         // limit to the latest revision only
 168                         $this->addTables('page');
 169                         $this->addWhere('page_id=rev_page');
 170                         $this->addWhere('page_latest=rev_id');
 171                         $this->validateLimit('page_count', $pageCount, 1, $userMax, $botMax);
 172
 173                         // Get all page IDs
 174                         $this->addWhereFld('page_id', array_keys($pageSet->getGoodTitles()));
 175
 176                         // assumption testing -- we should never get more then $pageCount rows.
 177                         $limit = $pageCount;
 178                 } else
 179                         ApiBase :: dieDebug(__METHOD__, 'param validation?');
 180
 181                 $this->addOption('LIMIT', $limit +1);
 182
 183                 $data = array ();
 184                 $count = 0;
 185                 $res = $this->select(__METHOD__);
 186
 187                 $db = $this->getDB();
 188                 while ($row = $db->fetchObject($res)) {
 189
 190                         if (++ $count > $limit) {
 191                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 192                                 if (!$enumRevMode)
 193                                         ApiBase :: dieDebug(__METHOD__, 'Got more rows then expected'); // bug report
 194                                 $this->setContinueEnumParameter('startid', intval($row->rev_id));
 195                                 break;
 196                         }
 197
 198                         $this->getResult()->addValue(
 199                                 array (
 200                                         'query',
 201                                         'pages',
 202                                         intval($row->rev_page),
 203                                         'revisions'),
 204                                 null,
 205                                 $this->extractRowInfo($row));
 206                 }
 207                 $db->freeResult($res);
 208
 209                 // Ensure that all revisions are shown as '<rev>' elements
 210                 $result = $this->getResult();
 211                 if ($result->getIsRawMode()) {
 212                         $data =& $result->getData();
 213                         foreach ($data['query']['pages'] as & $page) {
 214                                 if (is_array($page) && array_key_exists('revisions', $page)) {
 215                                         $result->setIndexedTagName($page['revisions'], 'rev');
 216                                 }
 217                         }
 218                 }
 219         }
 220
 221         private function extractRowInfo($row) {
 222
 223                 $vals = array ();
 224
 225                 if ($this->fld_ids) {
 226                         $vals['revid'] = intval($row->rev_id);
 227                         // $vals['oldid'] = intval($row->rev_text_id);  // todo: should this be exposed?
 228                 }
 229
 230                 if ($this->fld_flags && $row->rev_minor_edit)
 231                         $vals['minor'] = '';
 232
 233                 if ($this->fld_user) {
 234                         $vals['user'] = $row->rev_user_text;
 235                         if (!$row->rev_user)
 236                                 $vals['anon'] = '';
 237                 }
 238
 239                 if ($this->fld_timestamp) {
 240                         $vals['timestamp'] = wfTimestamp(TS_ISO_8601, $row->rev_timestamp);
 241                 }
 242
 243                 if ($this->fld_size && !is_null($row->rev_len)) {
 244                         $vals['size'] = intval($row->rev_len);
 245                 }
 246
 247                 if ($this->fld_comment && !empty ($row->rev_comment)) {
 248                         $vals['comment'] = $row->rev_comment;
 249                 }
 250
 251                 if ($this->fld_content) {
 252                         $text = Revision :: getRevisionText($row);
 253                         if ($this->expandTemplates) {
 254                                 global $wgParser;
 255                                 $text = $wgParser->preprocess( $text, Title::newFromID($row->rev_page), new ParserOptions() );
 256                         }
 257                         ApiResult :: setContent($vals, $text);
 258                 }
 259
 260                 return $vals;
 261         }
 262
 263         protected function getAllowedParams() {
 264                 return array (
 265                         'prop' => array (
 266                                 ApiBase :: PARAM_ISMULTI => true,
 267                                 ApiBase :: PARAM_DFLT => 'ids|timestamp|flags|comment|user',
 268                                 ApiBase :: PARAM_TYPE => array (
 269                                         'ids',
 270                                         'flags',
 271                                         'timestamp',
 272                                         'user',
 273                                         'size',
 274                                         'comment',
 275                                         'content',
 276                                 )
 277                         ),
 278                         'limit' => array (
 279                                 ApiBase :: PARAM_TYPE => 'limit',
 280                                 ApiBase :: PARAM_MIN => 1,
 281                                 ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
 282                                 ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
 283                         ),
 284                         'startid' => array (
 285                                 ApiBase :: PARAM_TYPE => 'integer'
 286                         ),
 287                         'endid' => array (
 288                                 ApiBase :: PARAM_TYPE => 'integer'
 289                         ),
 290                         'start' => array (
 291                                 ApiBase :: PARAM_TYPE => 'timestamp'
 292                         ),
 293                         'end' => array (
 294                                 ApiBase :: PARAM_TYPE => 'timestamp'
 295                         ),
 296                         'dir' => array (
 297                                 ApiBase :: PARAM_DFLT => 'older',
 298                                 ApiBase :: PARAM_TYPE => array (
 299                                         'newer',
 300                                         'older'
 301                                 )
 302                         ),
 303                         'user' => array(
 304                                 ApiBase :: PARAM_TYPE => 'user'
 305                         ),
 306                         'excludeuser' => array(
 307                                 ApiBase :: PARAM_TYPE => 'user'
 308                         ),
 309
 310                         'expandtemplates' => false,
 311                 );
 312         }
 313
 314         protected function getParamDescription() {
 315                 return array (
 316                         'prop' => 'Which properties to get for each revision.',
 317                         'limit' => 'limit how many revisions will be returned (enum)',
 318                         'startid' => 'from which revision id to start enumeration (enum)',
 319                         'endid' => 'stop revision enumeration on this revid (enum)',
 320                         'start' => 'from which revision timestamp to start enumeration (enum)',
 321                         'end' => 'enumerate up to this timestamp (enum)',
 322                         'dir' => 'direction of enumeration - towards "newer" or "older" revisions (enum)',
 323                         'user' => 'only include revisions made by user',
 324                         'excludeuser' => 'exclude revisions made by user',
 325                         'expandtemplates' => 'expand templates in revision content'
 326                 );
 327         }
 328
 329         protected function getDescription() {
 330                 return array (
 331                         'Get revision information.',
 332                         'This module may be used in several ways:',
 333                         ' 1) Get data about a set of pages (last revision), by setting titles or pageids parameter.',
 334                         ' 2) Get revisions for one given page, by using titles/pageids with start/end/limit params.',
 335                         ' 3) Get data about a set of revisions by setting their IDs with revids parameter.',
 336                         'All parameters marked as (enum) may only be used with a single page (#2).'
 337                 );
 338         }
 339
 340         protected function getExamples() {
 341                 return array (
 342                         'Get data with content for the last revision of titles "API" and "Main Page":',
 343                         '  api.php?action=query&prop=revisions&titles=API|Main%20Page&rvprop=timestamp|user|comment|content',
 344                         'Get last 5 revisions of the "Main Page":',
 345                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment',
 346                         'Get first 5 revisions of the "Main Page":',
 347                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer',
 348                         'Get first 5 revisions of the "Main Page" made after 2006-05-01:',
 349                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer&rvstart=20060501000000',
 350                         'Get first 5 revisions of the "Main Page" that were not made made by anonymous user "127.0.0.1"',
 351                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvexcludeuser=127.0.0.1',
 352                         'Get first 5 revisions of the "Main Page" that were made by the user "MediaWiki default"',
 353                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvuser=MediaWiki%20default',
 354                 );
 355         }
 356
 357         public function getVersion() {
 358                 return __CLASS__ . ': $Id$';
 359         }
 360 }
 361