includes/specials/SpecialMergeHistory.php

   1 <?php
   2 /**
   3  * Implements Special:MergeHistory
   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  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Special page allowing users with the appropriate permissions to
  26  * merge article histories, with some restrictions
  27  *
  28  * @ingroup SpecialPage
  29  */
  30 class SpecialMergeHistory extends SpecialPage {
  31         var $mAction, $mTarget, $mDest, $mTimestamp, $mTargetID, $mDestID, $mComment;
  32
  33         /**
  34          * @var Title
  35          */
  36         var $mTargetObj, $mDestObj;
  37
  38         public function __construct() {
  39                 parent::__construct( 'MergeHistory', 'mergehistory' );
  40         }
  41
  42         /**
  43          * @return void
  44          */
  45         private function loadRequestParams() {
  46                 $request = $this->getRequest();
  47                 $this->mAction = $request->getVal( 'action' );
  48                 $this->mTarget = $request->getVal( 'target' );
  49                 $this->mDest = $request->getVal( 'dest' );
  50                 $this->mSubmitted = $request->getBool( 'submitted' );
  51
  52                 $this->mTargetID = intval( $request->getVal( 'targetID' ) );
  53                 $this->mDestID = intval( $request->getVal( 'destID' ) );
  54                 $this->mTimestamp = $request->getVal( 'mergepoint' );
  55                 if ( !preg_match( '/[0-9]{14}/', $this->mTimestamp ) ) {
  56                         $this->mTimestamp = '';
  57                 }
  58                 $this->mComment = $request->getText( 'wpComment' );
  59
  60                 $this->mMerge = $request->wasPosted() && $this->getUser()->matchEditToken( $request->getVal( 'wpEditToken' ) );
  61                 // target page
  62                 if ( $this->mSubmitted ) {
  63                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
  64                         $this->mDestObj = Title::newFromURL( $this->mDest );
  65                 } else {
  66                         $this->mTargetObj = null;
  67                         $this->mDestObj = null;
  68                 }
  69                 $this->preCacheMessages();
  70         }
  71
  72         /**
  73          * As we use the same small set of messages in various methods and that
  74          * they are called often, we call them once and save them in $this->message
  75          */
  76         function preCacheMessages() {
  77                 // Precache various messages
  78                 if ( !isset( $this->message ) ) {
  79                         $this->message['last'] = $this->msg( 'last' )->escaped();
  80                 }
  81         }
  82
  83         public function execute( $par ) {
  84                 $this->checkPermissions();
  85                 $this->checkReadOnly();
  86
  87                 $this->loadRequestParams();
  88
  89                 $this->setHeaders();
  90                 $this->outputHeader();
  91
  92                 if ( $this->mTargetID && $this->mDestID && $this->mAction == 'submit' && $this->mMerge ) {
  93                         $this->merge();
  94                         return;
  95                 }
  96
  97                 if ( !$this->mSubmitted ) {
  98                         $this->showMergeForm();
  99                         return;
 100                 }
 101
 102                 $errors = array();
 103                 if ( !$this->mTargetObj instanceof Title ) {
 104                         $errors[] = $this->msg( 'mergehistory-invalid-source' )->parseAsBlock();
 105                 } elseif ( !$this->mTargetObj->exists() ) {
 106                         $errors[] = $this->msg( 'mergehistory-no-source', array( 'parse' ),
 107                                 wfEscapeWikiText( $this->mTargetObj->getPrefixedText() )
 108                         )->parseAsBlock();
 109                 }
 110
 111                 if ( !$this->mDestObj instanceof Title ) {
 112                         $errors[] = $this->msg( 'mergehistory-invalid-destination' )->parseAsBlock();
 113                 } elseif ( !$this->mDestObj->exists() ) {
 114                         $errors[] = $this->msg( 'mergehistory-no-destination', array( 'parse' ),
 115                                 wfEscapeWikiText( $this->mDestObj->getPrefixedText() )
 116                         )->parseAsBlock();
 117                 }
 118
 119                 if ( $this->mTargetObj && $this->mDestObj && $this->mTargetObj->equals( $this->mDestObj ) ) {
 120                         $errors[] = $this->msg( 'mergehistory-same-destination' )->parseAsBlock();
 121                 }
 122
 123                 if ( count( $errors ) ) {
 124                         $this->showMergeForm();
 125                         $this->getOutput()->addHTML( implode( "\n", $errors ) );
 126                 } else {
 127                         $this->showHistory();
 128                 }
 129
 130         }
 131
 132         function showMergeForm() {
 133                 global $wgScript;
 134
 135                 $this->getOutput()->addWikiMsg( 'mergehistory-header' );
 136
 137                 $this->getOutput()->addHTML(
 138                         Xml::openElement( 'form', array(
 139                                 'method' => 'get',
 140                                 'action' => $wgScript ) ) .
 141                         '<fieldset>' .
 142                         Xml::element( 'legend', array(),
 143                                 $this->msg( 'mergehistory-box' )->text() ) .
 144                         Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
 145                         Html::hidden( 'submitted', '1' ) .
 146                         Html::hidden( 'mergepoint', $this->mTimestamp ) .
 147                         Xml::openElement( 'table' ) .
 148                         '<tr>
 149                                 <td>' . Xml::label( $this->msg( 'mergehistory-from' )->text(), 'target' ) . '</td>
 150                                 <td>' . Xml::input( 'target', 30, $this->mTarget, array( 'id' => 'target' ) ) . '</td>
 151                         </tr><tr>
 152                                 <td>' . Xml::label( $this->msg( 'mergehistory-into' )->text(), 'dest' ) . '</td>
 153                                 <td>' . Xml::input( 'dest', 30, $this->mDest, array( 'id' => 'dest' ) ) . '</td>
 154                         </tr><tr><td>' .
 155                         Xml::submitButton( $this->msg( 'mergehistory-go' )->text() ) .
 156                         '</td></tr>' .
 157                         Xml::closeElement( 'table' ) .
 158                         '</fieldset>' .
 159                         '</form>'
 160                 );
 161         }
 162
 163         private function showHistory() {
 164                 $this->showMergeForm();
 165
 166                 # List all stored revisions
 167                 $revisions = new MergeHistoryPager(
 168                         $this, array(), $this->mTargetObj, $this->mDestObj
 169                 );
 170                 $haveRevisions = $revisions && $revisions->getNumRows() > 0;
 171
 172                 $out = $this->getOutput();
 173                 $titleObj = $this->getTitle();
 174                 $action = $titleObj->getLocalURL( array( 'action' => 'submit' ) );
 175                 # Start the form here
 176                 $top = Xml::openElement(
 177                         'form',
 178                         array(
 179                                 'method' => 'post',
 180                                 'action' => $action,
 181                                 'id' => 'merge'
 182                         )
 183                 );
 184                 $out->addHTML( $top );
 185
 186                 if ( $haveRevisions ) {
 187                         # Format the user-visible controls (comment field, submission button)
 188                         # in a nice little table
 189                         $table =
 190                                 Xml::openElement( 'fieldset' ) .
 191                                 $this->msg( 'mergehistory-merge', $this->mTargetObj->getPrefixedText(),
 192                                         $this->mDestObj->getPrefixedText() )->parse() .
 193                                 Xml::openElement( 'table', array( 'id' => 'mw-mergehistory-table' ) ) .
 194                                         '<tr>
 195                                                 <td class="mw-label">' .
 196                                                         Xml::label( $this->msg( 'mergehistory-reason' )->text(), 'wpComment' ) .
 197                                                 '</td>
 198                                                 <td class="mw-input">' .
 199                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' => 'wpComment' ) ) .
 200                                                 '</td>
 201                                         </tr>
 202                                         <tr>
 203                                                 <td>&#160;</td>
 204                                                 <td class="mw-submit">' .
 205                                                         Xml::submitButton( $this->msg( 'mergehistory-submit' )->text(), array( 'name' => 'merge', 'id' => 'mw-merge-submit' ) ) .
 206                                                 '</td>
 207                                         </tr>' .
 208                                 Xml::closeElement( 'table' ) .
 209                                 Xml::closeElement( 'fieldset' );
 210
 211                         $out->addHTML( $table );
 212                 }
 213
 214                 $out->addHTML(
 215                         '<h2 id="mw-mergehistory">' .
 216                         $this->msg( 'mergehistory-list' )->escaped() . "</h2>\n"
 217                 );
 218
 219                 if ( $haveRevisions ) {
 220                         $out->addHTML( $revisions->getNavigationBar() );
 221                         $out->addHTML( '<ul>' );
 222                         $out->addHTML( $revisions->getBody() );
 223                         $out->addHTML( '</ul>' );
 224                         $out->addHTML( $revisions->getNavigationBar() );
 225                 } else {
 226                         $out->addWikiMsg( 'mergehistory-empty' );
 227                 }
 228
 229                 # Show relevant lines from the merge log:
 230                 $mergeLogPage = new LogPage( 'merge' );
 231                 $out->addHTML( '<h2>' . $mergeLogPage->getName()->escaped() . "</h2>\n" );
 232                 LogEventsList::showLogExtract( $out, 'merge', $this->mTargetObj );
 233
 234                 # When we submit, go by page ID to avoid some nasty but unlikely collisions.
 235                 # Such would happen if a page was renamed after the form loaded, but before submit
 236                 $misc = Html::hidden( 'targetID', $this->mTargetObj->getArticleID() );
 237                 $misc .= Html::hidden( 'destID', $this->mDestObj->getArticleID() );
 238                 $misc .= Html::hidden( 'target', $this->mTarget );
 239                 $misc .= Html::hidden( 'dest', $this->mDest );
 240                 $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
 241                 $misc .= Xml::closeElement( 'form' );
 242                 $out->addHTML( $misc );
 243
 244                 return true;
 245         }
 246
 247         function formatRevisionRow( $row ) {
 248                 $rev = new Revision( $row );
 249
 250                 $stxt = '';
 251                 $last = $this->message['last'];
 252
 253                 $ts = wfTimestamp( TS_MW, $row->rev_timestamp );
 254                 $checkBox = Xml::radio( 'mergepoint', $ts, false );
 255
 256                 $user = $this->getUser();
 257
 258                 $pageLink = Linker::linkKnown(
 259                         $rev->getTitle(),
 260                         htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) ),
 261                         array(),
 262                         array( 'oldid' => $rev->getId() )
 263                 );
 264                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 265                         $pageLink = '<span class="history-deleted">' . $pageLink . '</span>';
 266                 }
 267
 268                 # Last link
 269                 if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 270                         $last = $this->message['last'];
 271                 } elseif ( isset( $this->prevId[$row->rev_id] ) ) {
 272                         $last = Linker::linkKnown(
 273                                 $rev->getTitle(),
 274                                 $this->message['last'],
 275                                 array(),
 276                                 array(
 277                                         'diff' => $row->rev_id,
 278                                         'oldid' => $this->prevId[$row->rev_id]
 279                                 )
 280                         );
 281                 }
 282
 283                 $userLink = Linker::revUserTools( $rev );
 284
 285                 $size = $row->rev_len;
 286                 if ( !is_null( $size ) ) {
 287                         $stxt = Linker::formatRevisionSize( $size );
 288                 }
 289                 $comment = Linker::revComment( $rev );
 290
 291                 return Html::rawElement( 'li', array(),
 292                         $this->msg( 'mergehistory-revisionrow' )->rawParams( $checkBox, $last, $pageLink, $userLink, $stxt, $comment )->escaped() );
 293         }
 294
 295         function merge() {
 296                 # Get the titles directly from the IDs, in case the target page params
 297                 # were spoofed. The queries are done based on the IDs, so it's best to
 298                 # keep it consistent...
 299                 $targetTitle = Title::newFromID( $this->mTargetID );
 300                 $destTitle = Title::newFromID( $this->mDestID );
 301                 if ( is_null( $targetTitle ) || is_null( $destTitle ) ) {
 302                         return false; // validate these
 303                 }
 304                 if ( $targetTitle->getArticleID() == $destTitle->getArticleID() ) {
 305                         return false;
 306                 }
 307                 # Verify that this timestamp is valid
 308                 # Must be older than the destination page
 309                 $dbw = wfGetDB( DB_MASTER );
 310                 # Get timestamp into DB format
 311                 $this->mTimestamp = $this->mTimestamp ? $dbw->timestamp( $this->mTimestamp ) : '';
 312                 # Max timestamp should be min of destination page
 313                 $maxtimestamp = $dbw->selectField(
 314                         'revision',
 315                         'MIN(rev_timestamp)',
 316                         array( 'rev_page' => $this->mDestID ),
 317                         __METHOD__
 318                 );
 319                 # Destination page must exist with revisions
 320                 if ( !$maxtimestamp ) {
 321                         $this->getOutput()->addWikiMsg( 'mergehistory-fail' );
 322                         return false;
 323                 }
 324                 # Get the latest timestamp of the source
 325                 $lasttimestamp = $dbw->selectField(
 326                         array( 'page', 'revision' ),
 327                         'rev_timestamp',
 328                         array( 'page_id' => $this->mTargetID, 'page_latest = rev_id' ),
 329                         __METHOD__
 330                 );
 331                 # $this->mTimestamp must be older than $maxtimestamp
 332                 if ( $this->mTimestamp >= $maxtimestamp ) {
 333                         $this->getOutput()->addWikiMsg( 'mergehistory-fail' );
 334                         return false;
 335                 }
 336                 # Update the revisions
 337                 if ( $this->mTimestamp ) {
 338                         $timewhere = "rev_timestamp <= {$this->mTimestamp}";
 339                         $timestampLimit = wfTimestamp( TS_MW, $this->mTimestamp );
 340                 } else {
 341                         $timewhere = "rev_timestamp <= {$maxtimestamp}";
 342                         $timestampLimit = wfTimestamp( TS_MW, $lasttimestamp );
 343                 }
 344                 # Do the moving...
 345                 $dbw->update(
 346                         'revision',
 347                         array( 'rev_page' => $this->mDestID ),
 348                         array( 'rev_page' => $this->mTargetID, $timewhere ),
 349                         __METHOD__
 350                 );
 351
 352                 $count = $dbw->affectedRows();
 353                 # Make the source page a redirect if no revisions are left
 354                 $haveRevisions = $dbw->selectField(
 355                         'revision',
 356                         'rev_timestamp',
 357                         array( 'rev_page' => $this->mTargetID  ),
 358                         __METHOD__,
 359                         array( 'FOR UPDATE' )
 360                 );
 361                 if ( !$haveRevisions ) {
 362                         if ( $this->mComment ) {
 363                                 $comment = $this->msg(
 364                                         'mergehistory-comment',
 365                                         $targetTitle->getPrefixedText(),
 366                                         $destTitle->getPrefixedText(),
 367                                         $this->mComment
 368                                 )->inContentLanguage()->text();
 369                         } else {
 370                                 $comment = $this->msg(
 371                                         'mergehistory-autocomment',
 372                                         $targetTitle->getPrefixedText(),
 373                                         $destTitle->getPrefixedText()
 374                                 )->inContentLanguage()->text();
 375                         }
 376
 377                         $contentHandler = ContentHandler::getForTitle( $targetTitle );
 378                         $redirectContent = $contentHandler->makeRedirectContent( $destTitle );
 379
 380                         if ( $redirectContent ) {
 381                                 $redirectPage = WikiPage::factory( $targetTitle );
 382                                 $redirectRevision = new Revision( array(
 383                                         'title' => $targetTitle,
 384                                         'page' => $this->mTargetID,
 385                                         'comment' => $comment,
 386                                         'content' => $redirectContent ) );
 387                                 $redirectRevision->insertOn( $dbw );
 388                                 $redirectPage->updateRevisionOn( $dbw, $redirectRevision );
 389
 390                                 # Now, we record the link from the redirect to the new title.
 391                                 # It should have no other outgoing links...
 392                                 $dbw->delete( 'pagelinks', array( 'pl_from' => $this->mDestID ), __METHOD__ );
 393                                 $dbw->insert( 'pagelinks',
 394                                         array(
 395                                                 'pl_from' => $this->mDestID,
 396                                                 'pl_namespace' => $destTitle->getNamespace(),
 397                                                 'pl_title' => $destTitle->getDBkey() ),
 398                                         __METHOD__
 399                                 );
 400                         } else {
 401                                 // would be nice to show a warning if we couldn't create a redirect
 402                         }
 403                 } else {
 404                         $targetTitle->invalidateCache(); // update histories
 405                 }
 406                 $destTitle->invalidateCache(); // update histories
 407                 # Check if this did anything
 408                 if ( !$count ) {
 409                         $this->getOutput()->addWikiMsg( 'mergehistory-fail' );
 410                         return false;
 411                 }
 412                 # Update our logs
 413                 $log = new LogPage( 'merge' );
 414                 $log->addEntry(
 415                         'merge', $targetTitle, $this->mComment,
 416                         array( $destTitle->getPrefixedText(), $timestampLimit )
 417                 );
 418
 419                 $this->getOutput()->addWikiMsg( 'mergehistory-success',
 420                         $targetTitle->getPrefixedText(), $destTitle->getPrefixedText(), $count );
 421
 422                 wfRunHooks( 'ArticleMergeComplete', array( $targetTitle, $destTitle ) );
 423
 424                 return true;
 425         }
 426
 427         protected function getGroupName() {
 428                 return 'pagetools';
 429         }
 430 }
 431
 432 class MergeHistoryPager extends ReverseChronologicalPager {
 433         public $mForm, $mConds;
 434
 435         function __construct( $form, $conds = array(), $source, $dest ) {
 436                 $this->mForm = $form;
 437                 $this->mConds = $conds;
 438                 $this->title = $source;
 439                 $this->articleID = $source->getArticleID();
 440
 441                 $dbr = wfGetDB( DB_SLAVE );
 442                 $maxtimestamp = $dbr->selectField(
 443                         'revision',
 444                         'MIN(rev_timestamp)',
 445                         array( 'rev_page' => $dest->getArticleID() ),
 446                         __METHOD__
 447                 );
 448                 $this->maxTimestamp = $maxtimestamp;
 449
 450                 parent::__construct( $form->getContext() );
 451         }
 452
 453         function getStartBody() {
 454                 wfProfileIn( __METHOD__ );
 455                 # Do a link batch query
 456                 $this->mResult->seek( 0 );
 457                 $batch = new LinkBatch();
 458                 # Give some pointers to make (last) links
 459                 $this->mForm->prevId = array();
 460                 foreach ( $this->mResult as $row ) {
 461                         $batch->addObj( Title::makeTitleSafe( NS_USER, $row->user_name ) );
 462                         $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->user_name ) );
 463
 464                         $rev_id = isset( $rev_id ) ? $rev_id : $row->rev_id;
 465                         if ( $rev_id > $row->rev_id ) {
 466                                 $this->mForm->prevId[$rev_id] = $row->rev_id;
 467                         } elseif ( $rev_id < $row->rev_id ) {
 468                                 $this->mForm->prevId[$row->rev_id] = $rev_id;
 469                         }
 470
 471                         $rev_id = $row->rev_id;
 472                 }
 473
 474                 $batch->execute();
 475                 $this->mResult->seek( 0 );
 476
 477                 wfProfileOut( __METHOD__ );
 478                 return '';
 479         }
 480
 481         function formatRow( $row ) {
 482                 return $this->mForm->formatRevisionRow( $row );
 483         }
 484
 485         function getQueryInfo() {
 486                 $conds = $this->mConds;
 487                 $conds['rev_page'] = $this->articleID;
 488                 $conds[] = "rev_timestamp < {$this->maxTimestamp}";
 489                 return array(
 490                         'tables' => array( 'revision', 'page', 'user' ),
 491                         'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 492                         'conds' => $conds,
 493                         'join_conds' => array(
 494                                 'page' => Revision::pageJoinCond(),
 495                                 'user' => Revision::userJoinCond() )
 496                 );
 497         }
 498
 499         function getIndexField() {
 500                 return 'rev_timestamp';
 501         }
 502 }