includes/actions/McrUndoAction.php

   1 <?php
   2 /**
   3  * Temporary action for MCR undos
   4  * @file
   5  * @ingroup Actions
   6  */
   7
   8 use MediaWiki\MediaWikiServices;
   9 use MediaWiki\Storage\MutableRevisionRecord;
  10 use MediaWiki\Storage\RevisionRecord;
  11 use MediaWiki\Storage\SlotRecord;
  12
  13 /**
  14  * Temporary action for MCR undos
  15  *
  16  * This is intended to go away when real MCR support is added to EditPage and
  17  * the standard undo-with-edit behavior can be implemented there instead.
  18  *
  19  * If this were going to be kept, we'd probably want to figure out a good way
  20  * to reuse the same code for generating the headers, summary box, and buttons
  21  * on EditPage and here, and to better share the diffing and preview logic
  22  * between the two. But doing that now would require much of the rewriting of
  23  * EditPage that we're trying to put off by doing this instead.
  24  *
  25  * @ingroup Actions
  26  * @since 1.32
  27  * @deprecated since 1.32
  28  */
  29 class McrUndoAction extends FormAction {
  30
  31         protected $undo = 0, $undoafter = 0, $cur = 0;
  32
  33         /** @param RevisionRecord|null */
  34         protected $curRev = null;
  35
  36         public function getName() {
  37                 return 'mcrundo';
  38         }
  39
  40         public function getDescription() {
  41                 return '';
  42         }
  43
  44         public function show() {
  45                 // Send a cookie so anons get talk message notifications
  46                 // (copied from SubmitAction)
  47                 MediaWiki\Session\SessionManager::getGlobalSession()->persist();
  48
  49                 // Some stuff copied from EditAction
  50                 $this->useTransactionalTimeLimit();
  51
  52                 $out = $this->getOutput();
  53                 $out->setRobotPolicy( 'noindex,nofollow' );
  54                 if ( $this->getContext()->getConfig()->get( 'UseMediaWikiUIEverywhere' ) ) {
  55                         $out->addModuleStyles( [
  56                                 'mediawiki.ui.input',
  57                                 'mediawiki.ui.checkbox',
  58                         ] );
  59                 }
  60
  61                 // IP warning headers copied from EditPage
  62                 // (should more be copied?)
  63                 if ( wfReadOnly() ) {
  64                         $out->wrapWikiMsg(
  65                                 "<div id=\"mw-read-only-warning\">\n$1\n</div>",
  66                                 [ 'readonlywarning', wfReadOnlyReason() ]
  67                         );
  68                 } elseif ( $this->context->getUser()->isAnon() ) {
  69                         if ( !$this->getRequest()->getCheck( 'wpPreview' ) ) {
  70                                 $out->wrapWikiMsg(
  71                                         "<div id='mw-anon-edit-warning' class='warningbox'>\n$1\n</div>",
  72                                         [ 'anoneditwarning',
  73                                                 // Log-in link
  74                                                 SpecialPage::getTitleFor( 'Userlogin' )->getFullURL( [
  75                                                         'returnto' => $this->getTitle()->getPrefixedDBkey()
  76                                                 ] ),
  77                                                 // Sign-up link
  78                                                 SpecialPage::getTitleFor( 'CreateAccount' )->getFullURL( [
  79                                                         'returnto' => $this->getTitle()->getPrefixedDBkey()
  80                                                 ] )
  81                                         ]
  82                                 );
  83                         } else {
  84                                 $out->wrapWikiMsg( "<div id=\"mw-anon-preview-warning\" class=\"warningbox\">\n$1</div>",
  85                                         'anonpreviewwarning'
  86                                 );
  87                         }
  88                 }
  89
  90                 parent::show();
  91         }
  92
  93         protected function initFromParameters() {
  94                 $this->undoafter = $this->getRequest()->getInt( 'undoafter' );
  95                 $this->undo = $this->getRequest()->getInt( 'undo' );
  96
  97                 if ( $this->undo == 0 || $this->undoafter == 0 ) {
  98                         throw new ErrorPageError( 'mcrundofailed', 'mcrundo-missingparam' );
  99                 }
 100
 101                 $curRev = $this->page->getRevision();
 102                 if ( !$curRev ) {
 103                         throw new ErrorPageError( 'mcrundofailed', 'nopagetext' );
 104                 }
 105                 $this->curRev = $curRev->getRevisionRecord();
 106                 $this->cur = $this->getRequest()->getInt( 'cur', $this->curRev->getId() );
 107         }
 108
 109         protected function checkCanExecute( User $user ) {
 110                 parent::checkCanExecute( $user );
 111
 112                 $this->initFromParameters();
 113
 114                 $revisionLookup = MediaWikiServices::getInstance()->getRevisionLookup();
 115
 116                 $undoRev = $revisionLookup->getRevisionById( $this->undo );
 117                 $oldRev = $revisionLookup->getRevisionById( $this->undoafter );
 118
 119                 if ( $undoRev === null || $oldRev === null ||
 120                         $undoRev->isDeleted( RevisionRecord::DELETED_TEXT ) ||
 121                         $oldRev->isDeleted( RevisionRecord::DELETED_TEXT )
 122                 ) {
 123                         throw new ErrorPageError( 'mcrundofailed', 'undo-norev' );
 124                 }
 125
 126                 return true;
 127         }
 128
 129         /**
 130          * @return MutableRevisionRecord
 131          */
 132         private function getNewRevision() {
 133                 $revisionLookup = MediaWikiServices::getInstance()->getRevisionLookup();
 134
 135                 $undoRev = $revisionLookup->getRevisionById( $this->undo );
 136                 $oldRev = $revisionLookup->getRevisionById( $this->undoafter );
 137                 $curRev = $this->curRev;
 138
 139                 $isLatest = $curRev->getId() === $undoRev->getId();
 140
 141                 if ( $undoRev === null || $oldRev === null ||
 142                         $undoRev->isDeleted( RevisionRecord::DELETED_TEXT ) ||
 143                         $oldRev->isDeleted( RevisionRecord::DELETED_TEXT )
 144                 ) {
 145                         throw new ErrorPageError( 'mcrundofailed', 'undo-norev' );
 146                 }
 147
 148                 if ( $isLatest ) {
 149                         // Short cut! Undoing the current revision means we just restore the old.
 150                         return MutableRevisionRecord::newFromParentRevision( $oldRev );
 151                 }
 152
 153                 $newRev = MutableRevisionRecord::newFromParentRevision( $curRev );
 154
 155                 // Figure out the roles that need merging by first collecting all roles
 156                 // and then removing the ones that don't.
 157                 $rolesToMerge = array_unique( array_merge(
 158                         $oldRev->getSlotRoles(),
 159                         $undoRev->getSlotRoles(),
 160                         $curRev->getSlotRoles()
 161                 ) );
 162
 163                 // Any roles with the same content in $oldRev and $undoRev can be
 164                 // inherited because undo won't change them.
 165                 $rolesToMerge = array_intersect(
 166                         $rolesToMerge, $oldRev->getSlots()->getRolesWithDifferentContent( $undoRev->getSlots() )
 167                 );
 168                 if ( !$rolesToMerge ) {
 169                         throw new ErrorPageError( 'mcrundofailed', 'undo-nochange' );
 170                 }
 171
 172                 // Any roles with the same content in $oldRev and $curRev were already reverted
 173                 // and so can be inherited.
 174                 $rolesToMerge = array_intersect(
 175                         $rolesToMerge, $oldRev->getSlots()->getRolesWithDifferentContent( $curRev->getSlots() )
 176                 );
 177                 if ( !$rolesToMerge ) {
 178                         throw new ErrorPageError( 'mcrundofailed', 'undo-nochange' );
 179                 }
 180
 181                 // Any roles with the same content in $undoRev and $curRev weren't
 182                 // changed since and so can be reverted to $oldRev.
 183                 $diffRoles = array_intersect(
 184                         $rolesToMerge, $undoRev->getSlots()->getRolesWithDifferentContent( $curRev->getSlots() )
 185                 );
 186                 foreach ( array_diff( $rolesToMerge, $diffRoles ) as $role ) {
 187                         if ( $oldRev->hasSlot( $role ) ) {
 188                                 $newRev->inheritSlot( $oldRev->getSlot( $role, RevisionRecord::RAW ) );
 189                         } else {
 190                                 $newRev->removeSlot( $role );
 191                         }
 192                 }
 193                 $rolesToMerge = $diffRoles;
 194
 195                 // Any slot additions or removals not handled by the above checks can't be undone.
 196                 // There will be only one of the three revisions missing the slot:
 197                 //  - !old means it was added in the undone revisions and modified after.
 198                 //    Should it be removed entirely for the undo, or should the modified version be kept?
 199                 //  - !undo means it was removed in the undone revisions and then readded with different content.
 200                 //    Which content is should be kept, the old or the new?
 201                 //  - !cur means it was changed in the undone revisions and then deleted after.
 202                 //    Did someone delete vandalized content instead of undoing (meaning we should ideally restore
 203                 //    it), or should it stay gone?
 204                 foreach ( $rolesToMerge as $role ) {
 205                         if ( !$oldRev->hasSlot( $role ) || !$undoRev->hasSlot( $role ) || !$curRev->hasSlot( $role ) ) {
 206                                 throw new ErrorPageError( 'mcrundofailed', 'undo-failure' );
 207                         }
 208                 }
 209
 210                 // Try to merge anything that's left.
 211                 foreach ( $rolesToMerge as $role ) {
 212                         $oldContent = $oldRev->getSlot( $role, RevisionRecord::RAW )->getContent();
 213                         $undoContent = $undoRev->getSlot( $role, RevisionRecord::RAW )->getContent();
 214                         $curContent = $curRev->getSlot( $role, RevisionRecord::RAW )->getContent();
 215                         $newContent = $undoContent->getContentHandler()
 216                                 ->getUndoContent( $curContent, $undoContent, $oldContent, $isLatest );
 217                         if ( !$newContent ) {
 218                                 throw new ErrorPageError( 'mcrundofailed', 'undo-failure' );
 219                         }
 220                         $newRev->setSlot( SlotRecord::newUnsaved( $role, $newContent ) );
 221                 }
 222
 223                 return $newRev;
 224         }
 225
 226         private function generateDiffOrPreview() {
 227                 $newRev = $this->getNewRevision();
 228                 if ( $newRev->hasSameContent( $this->curRev ) ) {
 229                         throw new ErrorPageError( 'mcrundofailed', 'undo-nochange' );
 230                 }
 231
 232                 $diffEngine = new DifferenceEngine( $this->context );
 233                 $diffEngine->setRevisions( $this->curRev, $newRev );
 234
 235                 $oldtitle = $this->context->msg( 'currentrev' )->parse();
 236                 $newtitle = $this->context->msg( 'yourtext' )->parse();
 237
 238                 if ( $this->getRequest()->getCheck( 'wpPreview' ) ) {
 239                         $this->showPreview( $newRev );
 240                         return '';
 241                 } else {
 242                         $diffText = $diffEngine->getDiff( $oldtitle, $newtitle );
 243                         $diffEngine->showDiffStyle();
 244                         return '<div id="wikiDiff">' . $diffText . '</div>';
 245                 }
 246         }
 247
 248         private function showPreview( RevisionRecord $rev ) {
 249                 // Mostly copied from EditPage::getPreviewText()
 250                 $out = $this->getOutput();
 251
 252                 try {
 253                         $previewHTML = '';
 254
 255                         # provide a anchor link to the form
 256                         $continueEditing = '<span class="mw-continue-editing">' .
 257                                 '[[#mw-mcrundo-form|' .
 258                                 $this->context->getLanguage()->getArrow() . ' ' .
 259                                 $this->context->msg( 'continue-editing' )->text() . ']]</span>';
 260
 261                         $note = $this->context->msg( 'previewnote' )->plain() . ' ' . $continueEditing;
 262
 263                         $parserOptions = $this->page->makeParserOptions( $this->context );
 264                         $parserOptions->setIsPreview( true );
 265                         $parserOptions->setIsSectionPreview( false );
 266                         $parserOptions->enableLimitReport();
 267
 268                         $parserOutput = MediaWikiServices::getInstance()->getRevisionRenderer()
 269                                 ->getRenderedRevision( $rev, $parserOptions, $this->context->getUser() )
 270                                 ->getRevisionParserOutput();
 271                         $previewHTML = $parserOutput->getText( [ 'enableSectionEditLinks' => false ] );
 272
 273                         $out->addParserOutputMetadata( $parserOutput );
 274                         if ( count( $parserOutput->getWarnings() ) ) {
 275                                 $note .= "\n\n" . implode( "\n\n", $parserOutput->getWarnings() );
 276                         }
 277                 } catch ( MWContentSerializationException $ex ) {
 278                         $m = $this->context->msg(
 279                                 'content-failed-to-parse',
 280                                 $ex->getMessage()
 281                         );
 282                         $note .= "\n\n" . $m->parse();
 283                         $previewHTML = '';
 284                 }
 285
 286                 $previewhead = "<div class='previewnote'>\n" .
 287                         '<h2 id="mw-previewheader">' . $this->context->msg( 'preview' )->escaped() . "</h2>" .
 288                         $out->parse( $note, true, /* interface */true ) . "<hr /></div>\n";
 289
 290                 $pageViewLang = $this->getTitle()->getPageViewLanguage();
 291                 $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
 292                         'class' => 'mw-content-' . $pageViewLang->getDir() ];
 293                 $previewHTML = Html::rawElement( 'div', $attribs, $previewHTML );
 294
 295                 $out->addHtml( $previewhead . $previewHTML );
 296         }
 297
 298         public function onSubmit( $data ) {
 299                 global $wgUseRCPatrol;
 300
 301                 if ( !$this->getRequest()->getCheck( 'wpSave' ) ) {
 302                         // Diff or preview
 303                         return false;
 304                 }
 305
 306                 $updater = $this->page->getPage()->newPageUpdater( $this->context->getUser() );
 307                 $curRev = $updater->grabParentRevision();
 308                 if ( !$curRev ) {
 309                         throw new ErrorPageError( 'mcrundofailed', 'nopagetext' );
 310                 }
 311
 312                 if ( $this->cur !== $curRev->getId() ) {
 313                         return Status::newFatal( 'mcrundo-changed' );
 314                 }
 315
 316                 $newRev = $this->getNewRevision();
 317                 if ( !$newRev->hasSameContent( $curRev ) ) {
 318                         // Copy new slots into the PageUpdater, and remove any removed slots.
 319                         // TODO: This interface is awful, there should be a way to just pass $newRev.
 320                         // TODO: MCR: test this once we can store multiple slots
 321                         foreach ( $newRev->getSlots()->getSlots() as $slot ) {
 322                                 $updater->setSlot( $slot );
 323                         }
 324                         foreach ( $curRev->getSlotRoles() as $role ) {
 325                                 if ( !$newRev->hasSlot( $role ) ) {
 326                                         $updater->removeSlot( $role );
 327                                 }
 328                         }
 329
 330                         $updater->setOriginalRevisionId( false );
 331                         $updater->setUndidRevisionId( $this->undo );
 332
 333                         // TODO: Ugh.
 334                         if ( $wgUseRCPatrol && $this->getTitle()->userCan( 'autopatrol', $this->getUser() ) ) {
 335                                 $updater->setRcPatrolStatus( RecentChange::PRC_AUTOPATROLLED );
 336                         }
 337
 338                         $updater->saveRevision(
 339                                 CommentStoreComment::newUnsavedComment( trim( $this->getRequest()->getVal( 'wpSummary' ) ) ),
 340                                 EDIT_AUTOSUMMARY | EDIT_UPDATE
 341                         );
 342
 343                         return $updater->getStatus();
 344                 }
 345
 346                 return Status::newGood();
 347         }
 348
 349         protected function usesOOUI() {
 350                 return true;
 351         }
 352
 353         protected function getFormFields() {
 354                 $request = $this->getRequest();
 355                 $config = $this->context->getConfig();
 356                 $oldCommentSchema = $config->get( 'CommentTableSchemaMigrationStage' ) === MIGRATION_OLD;
 357                 $ret = [
 358                         'diff' => [
 359                                 'type' => 'info',
 360                                 'vertical-label' => true,
 361                                 'raw' => true,
 362                                 'default' => function () {
 363                                         return $this->generateDiffOrPreview();
 364                                 }
 365                         ],
 366                         'summary' => [
 367                                 'type' => 'text',
 368                                 'id' => 'wpSummary',
 369                                 'name' => 'wpSummary',
 370                                 'cssclass' => 'mw-summary',
 371                                 'label-message' => 'summary',
 372                                 'maxlength' => $oldCommentSchema ? 200 : CommentStore::COMMENT_CHARACTER_LIMIT,
 373                                 'value' => $request->getVal( 'wpSummary', '' ),
 374                                 'size' => 60,
 375                                 'spellcheck' => 'true',
 376                         ],
 377                         'summarypreview' => [
 378                                 'type' => 'info',
 379                                 'label-message' => 'summary-preview',
 380                                 'raw' => true,
 381                         ],
 382                 ];
 383
 384                 if ( $request->getCheck( 'wpSummary' ) ) {
 385                         $ret['summarypreview']['default'] = Xml::tags( 'div', [ 'class' => 'mw-summary-preview' ],
 386                                 Linker::commentBlock( trim( $request->getVal( 'wpSummary' ) ), $this->getTitle(), false )
 387                         );
 388                 } else {
 389                         unset( $ret['summarypreview'] );
 390                 }
 391
 392                 return $ret;
 393         }
 394
 395         protected function alterForm( HTMLForm $form ) {
 396                 $form->setWrapperLegendMsg( 'confirm-mcrundo-title' );
 397
 398                 $labelAsPublish = $this->context->getConfig()->get( 'EditSubmitButtonLabelPublish' );
 399
 400                 $form->setId( 'mw-mcrundo-form' );
 401                 $form->setSubmitName( 'wpSave' );
 402                 $form->setSubmitTooltip( $labelAsPublish ? 'publish' : 'save' );
 403                 $form->setSubmitTextMsg( $labelAsPublish ? 'publishchanges' : 'savechanges' );
 404                 $form->showCancel( true );
 405                 $form->setCancelTarget( $this->getTitle() );
 406                 $form->addButton( [
 407                         'name' => 'wpPreview',
 408                         'value' => '1',
 409                         'label-message' => 'showpreview',
 410                         'attribs' => Linker::tooltipAndAccesskeyAttribs( 'preview' ),
 411                 ] );
 412                 $form->addButton( [
 413                         'name' => 'wpDiff',
 414                         'value' => '1',
 415                         'label-message' => 'showdiff',
 416                         'attribs' => Linker::tooltipAndAccesskeyAttribs( 'diff' ),
 417                 ] );
 418
 419                 $this->addStatePropagationFields( $form );
 420         }
 421
 422         protected function addStatePropagationFields( HTMLForm $form ) {
 423                 $form->addHiddenField( 'undo', $this->undo );
 424                 $form->addHiddenField( 'undoafter', $this->undoafter );
 425                 $form->addHiddenField( 'cur', $this->curRev->getId() );
 426         }
 427
 428         public function onSuccess() {
 429                 $this->getOutput()->redirect( $this->getTitle()->getFullURL() );
 430         }
 431
 432         protected function preText() {
 433                 return '<div style="clear:both"></div>';
 434         }
 435 }