includes/RevisionList.php

   1 <?php
   2 /**
   3  * Holders of revision list for a single page
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * List for revision table items for a single page
  25  */
  26 abstract class RevisionListBase extends ContextSource {
  27         /**
  28          * @var Title
  29          */
  30         var $title;
  31
  32         var $ids, $res, $current;
  33
  34         /**
  35          * Construct a revision list for a given title
  36          * @param $context IContextSource
  37          * @param $title Title
  38          */
  39         function __construct( IContextSource $context, Title $title ) {
  40                 $this->setContext( $context );
  41                 $this->title = $title;
  42         }
  43
  44         /**
  45          * Select items only where the ID is any of the specified values
  46          * @param $ids Array
  47          */
  48         function filterByIds( array $ids ) {
  49                 $this->ids = $ids;
  50         }
  51
  52         /**
  53          * Get the internal type name of this list. Equal to the table name.
  54          * Override this function.
  55          * @return null
  56          */
  57         public function getType() {
  58                 return null;
  59         }
  60
  61         /**
  62          * Initialise the current iteration pointer
  63          */
  64         protected function initCurrent() {
  65                 $row = $this->res->current();
  66                 if ( $row ) {
  67                         $this->current = $this->newItem( $row );
  68                 } else {
  69                         $this->current = false;
  70                 }
  71         }
  72
  73         /**
  74          * Start iteration. This must be called before current() or next().
  75          * @return First list item
  76          */
  77         public function reset() {
  78                 if ( !$this->res ) {
  79                         $this->res = $this->doQuery( wfGetDB( DB_SLAVE ) );
  80                 } else {
  81                         $this->res->rewind();
  82                 }
  83                 $this->initCurrent();
  84                 return $this->current;
  85         }
  86
  87         /**
  88          * Get the current list item, or false if we are at the end
  89          */
  90         public function current() {
  91                 return $this->current;
  92         }
  93
  94         /**
  95          * Move the iteration pointer to the next list item, and return it.
  96          */
  97         public function next() {
  98                 $this->res->next();
  99                 $this->initCurrent();
 100                 return $this->current;
 101         }
 102
 103         /**
 104          * Get the number of items in the list.
 105          * @return int
 106          */
 107         public function length() {
 108                 if( !$this->res ) {
 109                         return 0;
 110                 } else {
 111                         return $this->res->numRows();
 112                 }
 113         }
 114
 115         /**
 116          * Do the DB query to iterate through the objects.
 117          * @param $db DatabaseBase object to use for the query
 118          */
 119         abstract public function doQuery( $db );
 120
 121         /**
 122          * Create an item object from a DB result row
 123          * @param $row stdclass
 124          */
 125         abstract public function newItem( $row );
 126 }
 127
 128 /**
 129  * Abstract base class for revision items
 130  */
 131 abstract class RevisionItemBase {
 132         /** The parent RevisionListBase */
 133         var $list;
 134
 135         /** The DB result row */
 136         var $row;
 137
 138         /**
 139          * @param $list RevisionListBase
 140          * @param $row DB result row
 141          */
 142         public function __construct( $list, $row ) {
 143                 $this->list = $list;
 144                 $this->row = $row;
 145         }
 146
 147         /**
 148          * Get the DB field name associated with the ID list.
 149          * Override this function.
 150          * @return null
 151          */
 152         public function getIdField() {
 153                 return null;
 154         }
 155
 156         /**
 157          * Get the DB field name storing timestamps.
 158          * Override this function.
 159          * @return bool
 160          */
 161         public function getTimestampField() {
 162                 return false;
 163         }
 164
 165         /**
 166          * Get the DB field name storing user ids.
 167          * Override this function.
 168          * @return bool
 169          */
 170         public function getAuthorIdField() {
 171                 return false;
 172         }
 173
 174         /**
 175          * Get the DB field name storing user names.
 176          * Override this function.
 177          * @return bool
 178          */
 179         public function getAuthorNameField() {
 180                 return false;
 181         }
 182
 183         /**
 184          * Get the ID, as it would appear in the ids URL parameter
 185          * @return
 186          */
 187         public function getId() {
 188                 $field = $this->getIdField();
 189                 return $this->row->$field;
 190         }
 191
 192         /**
 193          * Get the date, formatted in user's language
 194          * @return String
 195          */
 196         public function formatDate() {
 197                 return $this->list->getLanguage()->userDate( $this->getTimestamp(),
 198                         $this->list->getUser() );
 199         }
 200
 201         /**
 202          * Get the time, formatted in user's language
 203          * @return String
 204          */
 205         public function formatTime() {
 206                 return $this->list->getLanguage()->userTime( $this->getTimestamp(),
 207                         $this->list->getUser() );
 208         }
 209
 210         /**
 211          * Get the timestamp in MW 14-char form
 212          * @return Mixed
 213          */
 214         public function getTimestamp() {
 215                 $field = $this->getTimestampField();
 216                 return wfTimestamp( TS_MW, $this->row->$field );
 217         }
 218
 219         /**
 220          * Get the author user ID
 221          * @return int
 222          */
 223         public function getAuthorId() {
 224                 $field = $this->getAuthorIdField();
 225                 return intval( $this->row->$field );
 226         }
 227
 228         /**
 229          * Get the author user name
 230          * @return string
 231          */
 232         public function getAuthorName() {
 233                 $field = $this->getAuthorNameField();
 234                 return strval( $this->row->$field );
 235         }
 236
 237         /**
 238          * Returns true if the current user can view the item
 239          */
 240         abstract public function canView();
 241
 242         /**
 243          * Returns true if the current user can view the item text/file
 244          */
 245         abstract public function canViewContent();
 246
 247         /**
 248          * Get the HTML of the list item. Should be include "<li></li>" tags.
 249          * This is used to show the list in HTML form, by the special page.
 250          */
 251         abstract public function getHTML();
 252 }
 253
 254 class RevisionList extends RevisionListBase {
 255         public function getType() {
 256                 return 'revision';
 257         }
 258
 259         /**
 260          * @param $db DatabaseBase
 261          * @return mixed
 262          */
 263         public function doQuery( $db ) {
 264                 $conds = array( 'rev_page' => $this->title->getArticleID() );
 265                 if ( $this->ids !== null ) {
 266                         $conds['rev_id'] = array_map( 'intval', $this->ids );
 267                 }
 268                 return $db->select(
 269                         array( 'revision', 'page', 'user' ),
 270                         array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 271                         $conds,
 272                         __METHOD__,
 273                         array( 'ORDER BY' => 'rev_id DESC' ),
 274                         array(
 275                                 'page' => Revision::pageJoinCond(),
 276                                 'user' => Revision::userJoinCond() )
 277                 );
 278         }
 279
 280         public function newItem( $row ) {
 281                 return new RevisionItem( $this, $row );
 282         }
 283 }
 284
 285 /**
 286  * Item class for a live revision table row
 287  */
 288 class RevisionItem extends RevisionItemBase {
 289         var $revision, $context;
 290
 291         public function __construct( $list, $row ) {
 292                 parent::__construct( $list, $row );
 293                 $this->revision = new Revision( $row );
 294                 $this->context = $list->getContext();
 295         }
 296
 297         public function getIdField() {
 298                 return 'rev_id';
 299         }
 300
 301         public function getTimestampField() {
 302                 return 'rev_timestamp';
 303         }
 304
 305         public function getAuthorIdField() {
 306                 return 'rev_user';
 307         }
 308
 309         public function getAuthorNameField() {
 310                 return 'user_name'; // see Revision::selectUserFields()
 311         }
 312
 313         public function canView() {
 314                 return $this->revision->userCan( Revision::DELETED_RESTRICTED, $this->context->getUser() );
 315         }
 316
 317         public function canViewContent() {
 318                 return $this->revision->userCan( Revision::DELETED_TEXT, $this->context->getUser() );
 319         }
 320
 321         public function isDeleted() {
 322                 return $this->revision->isDeleted( Revision::DELETED_TEXT );
 323         }
 324
 325         /**
 326          * Get the HTML link to the revision text.
 327          * Overridden by RevDel_ArchiveItem.
 328          * @return string
 329          */
 330         protected function getRevisionLink() {
 331                 $date = $this->list->getLanguage()->timeanddate( $this->revision->getTimestamp(), true );
 332                 if ( $this->isDeleted() && !$this->canViewContent() ) {
 333                         return $date;
 334                 }
 335                 return Linker::link(
 336                         $this->list->title,
 337                         $date,
 338                         array(),
 339                         array(
 340                                 'oldid' => $this->revision->getId(),
 341                                 'unhide' => 1
 342                         )
 343                 );
 344         }
 345
 346         /**
 347          * Get the HTML link to the diff.
 348          * Overridden by RevDel_ArchiveItem
 349          * @return string
 350          */
 351         protected function getDiffLink() {
 352                 if ( $this->isDeleted() && !$this->canViewContent() ) {
 353                         return $this->context->msg( 'diff' )->escaped();
 354                 } else {
 355                         return Linker::link(
 356                                         $this->list->title,
 357                                         $this->context->msg( 'diff' )->escaped(),
 358                                         array(),
 359                                         array(
 360                                                 'diff' => $this->revision->getId(),
 361                                                 'oldid' => 'prev',
 362                                                 'unhide' => 1
 363                                         ),
 364                                         array(
 365                                                 'known',
 366                                                 'noclasses'
 367                                         )
 368                                 );
 369                 }
 370         }
 371
 372         public function getHTML() {
 373                 $difflink = $this->context->msg( 'parentheses' )
 374                         ->rawParams( $this->getDiffLink() )->escaped();
 375                 $revlink = $this->getRevisionLink();
 376                 $userlink = Linker::revUserLink( $this->revision );
 377                 $comment = Linker::revComment( $this->revision );
 378                 if ( $this->isDeleted() ) {
 379                         $revlink = "<span class=\"history-deleted\">$revlink</span>";
 380                 }
 381                 return "<li>$difflink $revlink $userlink $comment</li>";
 382         }
 383 }