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 string */
  32         protected $mAction;
  33
  34         /** @var string */
  35         protected $mTarget;
  36
  37         /** @var string */
  38         protected $mDest;
  39
  40         /** @var string */
  41         protected $mTimestamp;
  42
  43         /** @var int */
  44         protected $mTargetID;
  45
  46         /** @var int */
  47         protected $mDestID;
  48
  49         /** @var string */
  50         protected $mComment;
  51
  52         /** @var bool Was posted? */
  53         protected $mMerge;
  54
  55         /** @var bool Was submitted? */
  56         protected $mSubmitted;
  57
  58         /** @var Title */
  59         protected $mTargetObj;
  60
  61         /** @var Title */
  62         protected $mDestObj;
  63
  64         /** @var int[] */
  65         public $prevId;
  66
  67         public function __construct() {
  68                 parent::__construct( 'MergeHistory', 'mergehistory' );
  69         }
  70
  71         public function doesWrites() {
  72                 return true;
  73         }
  74
  75         /**
  76          * @return void
  77          */
  78         private function loadRequestParams() {
  79                 $request = $this->getRequest();
  80                 $this->mAction = $request->getVal( 'action' );
  81                 $this->mTarget = $request->getVal( 'target' );
  82                 $this->mDest = $request->getVal( 'dest' );
  83                 $this->mSubmitted = $request->getBool( 'submitted' );
  84
  85                 $this->mTargetID = intval( $request->getVal( 'targetID' ) );
  86                 $this->mDestID = intval( $request->getVal( 'destID' ) );
  87                 $this->mTimestamp = $request->getVal( 'mergepoint' );
  88                 if ( !preg_match( '/[0-9]{14}/', $this->mTimestamp ) ) {
  89                         $this->mTimestamp = '';
  90                 }
  91                 $this->mComment = $request->getText( 'wpComment' );
  92
  93                 $this->mMerge = $request->wasPosted()
  94                         && $this->getUser()->matchEditToken( $request->getVal( 'wpEditToken' ) );
  95
  96                 // target page
  97                 if ( $this->mSubmitted ) {
  98                         $this->mTargetObj = Title::newFromText( $this->mTarget );
  99                         $this->mDestObj = Title::newFromText( $this->mDest );
 100                 } else {
 101                         $this->mTargetObj = null;
 102                         $this->mDestObj = null;
 103                 }
 104         }
 105
 106         public function execute( $par ) {
 107                 $this->useTransactionalTimeLimit();
 108
 109                 $this->checkPermissions();
 110                 $this->checkReadOnly();
 111
 112                 $this->loadRequestParams();
 113
 114                 $this->setHeaders();
 115                 $this->outputHeader();
 116
 117                 if ( $this->mTargetID && $this->mDestID && $this->mAction == 'submit' && $this->mMerge ) {
 118                         $this->merge();
 119
 120                         return;
 121                 }
 122
 123                 if ( !$this->mSubmitted ) {
 124                         $this->showMergeForm();
 125
 126                         return;
 127                 }
 128
 129                 $errors = [];
 130                 if ( !$this->mTargetObj instanceof Title ) {
 131                         $errors[] = $this->msg( 'mergehistory-invalid-source' )->parseAsBlock();
 132                 } elseif ( !$this->mTargetObj->exists() ) {
 133                         $errors[] = $this->msg( 'mergehistory-no-source',
 134                                 wfEscapeWikiText( $this->mTargetObj->getPrefixedText() )
 135                         )->parseAsBlock();
 136                 }
 137
 138                 if ( !$this->mDestObj instanceof Title ) {
 139                         $errors[] = $this->msg( 'mergehistory-invalid-destination' )->parseAsBlock();
 140                 } elseif ( !$this->mDestObj->exists() ) {
 141                         $errors[] = $this->msg( 'mergehistory-no-destination',
 142                                 wfEscapeWikiText( $this->mDestObj->getPrefixedText() )
 143                         )->parseAsBlock();
 144                 }
 145
 146                 if ( $this->mTargetObj && $this->mDestObj && $this->mTargetObj->equals( $this->mDestObj ) ) {
 147                         $errors[] = $this->msg( 'mergehistory-same-destination' )->parseAsBlock();
 148                 }
 149
 150                 if ( count( $errors ) ) {
 151                         $this->showMergeForm();
 152                         $this->getOutput()->addHTML( implode( "\n", $errors ) );
 153                 } else {
 154                         $this->showHistory();
 155                 }
 156         }
 157
 158         function showMergeForm() {
 159                 $out = $this->getOutput();
 160                 $out->addWikiMsg( 'mergehistory-header' );
 161
 162                 $out->addHTML(
 163                         Xml::openElement( 'form', [
 164                                 'method' => 'get',
 165                                 'action' => wfScript() ] ) .
 166                                 '<fieldset>' .
 167                                 Xml::element( 'legend', [],
 168                                         $this->msg( 'mergehistory-box' )->text() ) .
 169                                 Html::hidden( 'title', $this->getPageTitle()->getPrefixedDBkey() ) .
 170                                 Html::hidden( 'submitted', '1' ) .
 171                                 Html::hidden( 'mergepoint', $this->mTimestamp ) .
 172                                 Xml::openElement( 'table' ) .
 173                                 '<tr>
 174                                 <td>' . Xml::label( $this->msg( 'mergehistory-from' )->text(), 'target' ) . '</td>
 175                                 <td>' . Xml::input( 'target', 30, $this->mTarget, [ 'id' => 'target' ] ) . '</td>
 176                         </tr><tr>
 177                                 <td>' . Xml::label( $this->msg( 'mergehistory-into' )->text(), 'dest' ) . '</td>
 178                                 <td>' . Xml::input( 'dest', 30, $this->mDest, [ 'id' => 'dest' ] ) . '</td>
 179                         </tr><tr><td>' .
 180                                 Xml::submitButton( $this->msg( 'mergehistory-go' )->text() ) .
 181                                 '</td></tr>' .
 182                                 Xml::closeElement( 'table' ) .
 183                                 '</fieldset>' .
 184                                 '</form>'
 185                 );
 186
 187                 $this->addHelpLink( 'Help:Merge history' );
 188         }
 189
 190         private function showHistory() {
 191                 $this->showMergeForm();
 192
 193                 # List all stored revisions
 194                 $revisions = new MergeHistoryPager(
 195                         $this, [], $this->mTargetObj, $this->mDestObj
 196                 );
 197                 $haveRevisions = $revisions && $revisions->getNumRows() > 0;
 198
 199                 $out = $this->getOutput();
 200                 $titleObj = $this->getPageTitle();
 201                 $action = $titleObj->getLocalURL( [ 'action' => 'submit' ] );
 202                 # Start the form here
 203                 $top = Xml::openElement(
 204                         'form',
 205                         [
 206                                 'method' => 'post',
 207                                 'action' => $action,
 208                                 'id' => 'merge'
 209                         ]
 210                 );
 211                 $out->addHTML( $top );
 212
 213                 if ( $haveRevisions ) {
 214                         # Format the user-visible controls (comment field, submission button)
 215                         # in a nice little table
 216                         $table =
 217                                 Xml::openElement( 'fieldset' ) .
 218                                         $this->msg( 'mergehistory-merge', $this->mTargetObj->getPrefixedText(),
 219                                                 $this->mDestObj->getPrefixedText() )->parse() .
 220                                         Xml::openElement( 'table', [ 'id' => 'mw-mergehistory-table' ] ) .
 221                                         '<tr>
 222                                                 <td class="mw-label">' .
 223                                         Xml::label( $this->msg( 'mergehistory-reason' )->text(), 'wpComment' ) .
 224                                         '</td>
 225                                         <td class="mw-input">' .
 226                                         Xml::input( 'wpComment', 50, $this->mComment, [ 'id' => 'wpComment' ] ) .
 227                                         '</td>
 228                                         </tr>
 229                                         <tr>
 230                                                 <td>&#160;</td>
 231                                                 <td class="mw-submit">' .
 232                                         Xml::submitButton(
 233                                                 $this->msg( 'mergehistory-submit' )->text(),
 234                                                 [ 'name' => 'merge', 'id' => 'mw-merge-submit' ]
 235                                         ) .
 236                                         '</td>
 237                                         </tr>' .
 238                                         Xml::closeElement( 'table' ) .
 239                                         Xml::closeElement( 'fieldset' );
 240
 241                         $out->addHTML( $table );
 242                 }
 243
 244                 $out->addHTML(
 245                         '<h2 id="mw-mergehistory">' .
 246                                 $this->msg( 'mergehistory-list' )->escaped() . "</h2>\n"
 247                 );
 248
 249                 if ( $haveRevisions ) {
 250                         $out->addHTML( $revisions->getNavigationBar() );
 251                         $out->addHTML( '<ul>' );
 252                         $out->addHTML( $revisions->getBody() );
 253                         $out->addHTML( '</ul>' );
 254                         $out->addHTML( $revisions->getNavigationBar() );
 255                 } else {
 256                         $out->addWikiMsg( 'mergehistory-empty' );
 257                 }
 258
 259                 # Show relevant lines from the merge log:
 260                 $mergeLogPage = new LogPage( 'merge' );
 261                 $out->addHTML( '<h2>' . $mergeLogPage->getName()->escaped() . "</h2>\n" );
 262                 LogEventsList::showLogExtract( $out, 'merge', $this->mTargetObj );
 263
 264                 # When we submit, go by page ID to avoid some nasty but unlikely collisions.
 265                 # Such would happen if a page was renamed after the form loaded, but before submit
 266                 $misc = Html::hidden( 'targetID', $this->mTargetObj->getArticleID() );
 267                 $misc .= Html::hidden( 'destID', $this->mDestObj->getArticleID() );
 268                 $misc .= Html::hidden( 'target', $this->mTarget );
 269                 $misc .= Html::hidden( 'dest', $this->mDest );
 270                 $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
 271                 $misc .= Xml::closeElement( 'form' );
 272                 $out->addHTML( $misc );
 273
 274                 return true;
 275         }
 276
 277         function formatRevisionRow( $row ) {
 278                 $rev = new Revision( $row );
 279
 280                 $stxt = '';
 281                 $last = $this->msg( 'last' )->escaped();
 282
 283                 $ts = wfTimestamp( TS_MW, $row->rev_timestamp );
 284                 $checkBox = Xml::radio( 'mergepoint', $ts, ( $this->mTimestamp === $ts ) );
 285
 286                 $user = $this->getUser();
 287
 288                 $pageLink = Linker::linkKnown(
 289                         $rev->getTitle(),
 290                         htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) ),
 291                         [],
 292                         [ 'oldid' => $rev->getId() ]
 293                 );
 294                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 295                         $pageLink = '<span class="history-deleted">' . $pageLink . '</span>';
 296                 }
 297
 298                 # Last link
 299                 if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 300                         $last = $this->msg( 'last' )->escaped();
 301                 } elseif ( isset( $this->prevId[$row->rev_id] ) ) {
 302                         $last = Linker::linkKnown(
 303                                 $rev->getTitle(),
 304                                 $this->msg( 'last' )->escaped(),
 305                                 [],
 306                                 [
 307                                         'diff' => $row->rev_id,
 308                                         'oldid' => $this->prevId[$row->rev_id]
 309                                 ]
 310                         );
 311                 }
 312
 313                 $userLink = Linker::revUserTools( $rev );
 314
 315                 $size = $row->rev_len;
 316                 if ( !is_null( $size ) ) {
 317                         $stxt = Linker::formatRevisionSize( $size );
 318                 }
 319                 $comment = Linker::revComment( $rev );
 320
 321                 return Html::rawElement( 'li', [],
 322                         $this->msg( 'mergehistory-revisionrow' )
 323                                 ->rawParams( $checkBox, $last, $pageLink, $userLink, $stxt, $comment )->escaped() );
 324         }
 325
 326         /**
 327          * Actually attempt the history move
 328          *
 329          * @todo if all versions of page A are moved to B and then a user
 330          * tries to do a reverse-merge via the "unmerge" log link, then page
 331          * A will still be a redirect (as it was after the original merge),
 332          * though it will have the old revisions back from before (as expected).
 333          * The user may have to "undo" the redirect manually to finish the "unmerge".
 334          * Maybe this should delete redirects at the target page of merges?
 335          *
 336          * @return bool Success
 337          */
 338         function merge() {
 339                 # Get the titles directly from the IDs, in case the target page params
 340                 # were spoofed. The queries are done based on the IDs, so it's best to
 341                 # keep it consistent...
 342                 $targetTitle = Title::newFromID( $this->mTargetID );
 343                 $destTitle = Title::newFromID( $this->mDestID );
 344                 if ( is_null( $targetTitle ) || is_null( $destTitle ) ) {
 345                         return false; // validate these
 346                 }
 347                 if ( $targetTitle->getArticleID() == $destTitle->getArticleID() ) {
 348                         return false;
 349                 }
 350
 351                 // MergeHistory object
 352                 $mh = new MergeHistory( $targetTitle, $destTitle, $this->mTimestamp );
 353
 354                 // Merge!
 355                 $mergeStatus = $mh->merge( $this->getUser(), $this->mComment );
 356                 if ( !$mergeStatus->isOK() ) {
 357                         // Failed merge
 358                         $this->getOutput()->addWikiMsg( $mergeStatus->getMessage() );
 359                         return false;
 360                 }
 361
 362                 $targetLink = Linker::link(
 363                         $targetTitle,
 364                         null,
 365                         [],
 366                         [ 'redirect' => 'no' ]
 367                 );
 368
 369                 $this->getOutput()->addWikiMsg( $this->msg( 'mergehistory-done' )
 370                         ->rawParams( $targetLink )
 371                         ->params( $destTitle->getPrefixedText() )
 372                         ->numParams( $mh->getMergedRevisionCount() )
 373                 );
 374
 375                 return true;
 376         }
 377
 378         protected function getGroupName() {
 379                 return 'pagetools';
 380         }
 381 }
 382
 383 class MergeHistoryPager extends ReverseChronologicalPager {
 384         /** @var SpecialMergeHistory */
 385         public $mForm;
 386
 387         /** @var array */
 388         public $mConds;
 389
 390         function __construct( SpecialMergeHistory $form, $conds, Title $source, Title $dest ) {
 391                 $this->mForm = $form;
 392                 $this->mConds = $conds;
 393                 $this->title = $source;
 394                 $this->articleID = $source->getArticleID();
 395
 396                 $dbr = wfGetDB( DB_SLAVE );
 397                 $maxtimestamp = $dbr->selectField(
 398                         'revision',
 399                         'MIN(rev_timestamp)',
 400                         [ 'rev_page' => $dest->getArticleID() ],
 401                         __METHOD__
 402                 );
 403                 $this->maxTimestamp = $maxtimestamp;
 404
 405                 parent::__construct( $form->getContext() );
 406         }
 407
 408         function getStartBody() {
 409                 # Do a link batch query
 410                 $this->mResult->seek( 0 );
 411                 $batch = new LinkBatch();
 412                 # Give some pointers to make (last) links
 413                 $this->mForm->prevId = [];
 414                 foreach ( $this->mResult as $row ) {
 415                         $batch->addObj( Title::makeTitleSafe( NS_USER, $row->user_name ) );
 416                         $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->user_name ) );
 417
 418                         $rev_id = isset( $rev_id ) ? $rev_id : $row->rev_id;
 419                         if ( $rev_id > $row->rev_id ) {
 420                                 $this->mForm->prevId[$rev_id] = $row->rev_id;
 421                         } elseif ( $rev_id < $row->rev_id ) {
 422                                 $this->mForm->prevId[$row->rev_id] = $rev_id;
 423                         }
 424
 425                         $rev_id = $row->rev_id;
 426                 }
 427
 428                 $batch->execute();
 429                 $this->mResult->seek( 0 );
 430
 431                 return '';
 432         }
 433
 434         function formatRow( $row ) {
 435                 return $this->mForm->formatRevisionRow( $row );
 436         }
 437
 438         function getQueryInfo() {
 439                 $conds = $this->mConds;
 440                 $conds['rev_page'] = $this->articleID;
 441                 $conds[] = "rev_timestamp < " . $this->mDb->addQuotes( $this->maxTimestamp );
 442
 443                 return [
 444                         'tables' => [ 'revision', 'page', 'user' ],
 445                         'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 446                         'conds' => $conds,
 447                         'join_conds' => [
 448                                 'page' => Revision::pageJoinCond(),
 449                                 'user' => Revision::userJoinCond() ]
 450                 ];
 451         }
 452
 453         function getIndexField() {
 454                 return 'rev_timestamp';
 455         }
 456 }