includes/WatchlistEditor.php

   1 <?php
   2
   3 /**
   4  * Provides the UI through which users can perform editing
   5  * operations on their watchlist
   6  *
   7  * @ingroup Watchlist
   8  * @author Rob Church <robchur@gmail.com>
   9  */
  10 class WatchlistEditor {
  11
  12         /**
  13          * Editing modes
  14          */
  15         const EDIT_CLEAR = 1;
  16         const EDIT_RAW = 2;
  17         const EDIT_NORMAL = 3;
  18
  19         /**
  20          * Main execution point
  21          *
  22          * @param $user User
  23          * @param $output OutputPage
  24          * @param $request WebRequest
  25          * @param $mode int
  26          */
  27         public function execute( $user, $output, $request, $mode ) {
  28                 global $wgUser;
  29                 if( wfReadOnly() ) {
  30                         $output->readOnlyPage();
  31                         return;
  32                 }
  33                 switch( $mode ) {
  34                         case self::EDIT_CLEAR:
  35                                 // The "Clear" link scared people too much.
  36                                 // Pass on to the raw editor, from which it's very easy to clear.
  37                         case self::EDIT_RAW:
  38                                 $output->setPageTitle( wfMsg( 'watchlistedit-raw-title' ) );
  39                                 if( $request->wasPosted() && $this->checkToken( $request, $wgUser ) ) {
  40                                         $wanted = $this->extractTitles( $request->getText( 'titles' ) );
  41                                         $current = $this->getWatchlist( $user );
  42                                         if( count( $wanted ) > 0 ) {
  43                                                 $toWatch = array_diff( $wanted, $current );
  44                                                 $toUnwatch = array_diff( $current, $wanted );
  45                                                 $this->watchTitles( $toWatch, $user );
  46                                                 $this->unwatchTitles( $toUnwatch, $user );
  47                                                 $user->invalidateCache();
  48                                                 if( count( $toWatch ) > 0 || count( $toUnwatch ) > 0 )
  49                                                         $output->addHTML( wfMsgExt( 'watchlistedit-raw-done', 'parse' ) );
  50                                                 if( ( $count = count( $toWatch ) ) > 0 ) {
  51                                                         $output->addHTML( wfMsgExt( 'watchlistedit-raw-added', 'parse', $count ) );
  52                                                         $this->showTitles( $toWatch, $output, $wgUser->getSkin() );
  53                                                 }
  54                                                 if( ( $count = count( $toUnwatch ) ) > 0 ) {
  55                                                         $output->addHTML( wfMsgExt( 'watchlistedit-raw-removed', 'parse', $count ) );
  56                                                         $this->showTitles( $toUnwatch, $output, $wgUser->getSkin() );
  57                                                 }
  58                                         } else {
  59                                                 $this->clearWatchlist( $user );
  60                                                 $user->invalidateCache();
  61                                                 $output->addHTML( wfMsgExt( 'watchlistedit-raw-removed', 'parse', count( $current ) ) );
  62                                                 $this->showTitles( $current, $output, $wgUser->getSkin() );
  63                                         }
  64                                 }
  65                                 $this->showRawForm( $output, $user );
  66                                 break;
  67                         case self::EDIT_NORMAL:
  68                                 $output->setPageTitle( wfMsg( 'watchlistedit-normal-title' ) );
  69                                 if( $request->wasPosted() && $this->checkToken( $request, $wgUser ) ) {
  70                                         $titles = $this->extractTitles( $request->getArray( 'titles' ) );
  71                                         $this->unwatchTitles( $titles, $user );
  72                                         $user->invalidateCache();
  73                                         $output->addHTML( wfMsgExt( 'watchlistedit-normal-done', 'parse',
  74                                                 $GLOBALS['wgLang']->formatNum( count( $titles ) ) ) );
  75                                         $this->showTitles( $titles, $output, $wgUser->getSkin() );
  76                                 }
  77                                 $this->showNormalForm( $output, $user );
  78                 }
  79         }
  80
  81         /**
  82          * Check the edit token from a form submission
  83          *
  84          * @param $request WebRequest
  85          * @param $user User
  86          * @return bool
  87          */
  88         private function checkToken( $request, $user ) {
  89                 return $user->matchEditToken( $request->getVal( 'token' ), 'watchlistedit' );
  90         }
  91
  92         /**
  93          * Extract a list of titles from a blob of text, returning
  94          * (prefixed) strings; unwatchable titles are ignored
  95          *
  96          * @param $list mixed
  97          * @return array
  98          */
  99         private function extractTitles( $list ) {
 100                 $titles = array();
 101                 if( !is_array( $list ) ) {
 102                         $list = explode( "\n", trim( $list ) );
 103                         if( !is_array( $list ) ) {
 104                                 return array();
 105                         }
 106                 }
 107                 foreach( $list as $text ) {
 108                         $text = trim( $text );
 109                         if( strlen( $text ) > 0 ) {
 110                                 $title = Title::newFromText( $text );
 111                                 if( $title instanceof Title && $title->isWatchable() ) {
 112                                         $titles[] = $title->getPrefixedText();
 113                                 }
 114                         }
 115                 }
 116                 return array_unique( $titles );
 117         }
 118
 119         /**
 120          * Print out a list of linked titles
 121          *
 122          * $titles can be an array of strings or Title objects; the former
 123          * is preferred, since Titles are very memory-heavy
 124          *
 125          * @param $titles An array of strings, or Title objects
 126          * @param $output OutputPage
 127          * @param $skin Skin
 128          */
 129         private function showTitles( $titles, $output, $skin ) {
 130                 $talk = wfMsgHtml( 'talkpagelinktext' );
 131                 // Do a batch existence check
 132                 $batch = new LinkBatch();
 133                 foreach( $titles as $title ) {
 134                         if( !$title instanceof Title ) {
 135                                 $title = Title::newFromText( $title );
 136                         }
 137                         if( $title instanceof Title ) {
 138                                 $batch->addObj( $title );
 139                                 $batch->addObj( $title->getTalkPage() );
 140                         }
 141                 }
 142                 $batch->execute();
 143                 // Print out the list
 144                 $output->addHTML( "<ul>\n" );
 145                 foreach( $titles as $title ) {
 146                         if( !$title instanceof Title ) {
 147                                 $title = Title::newFromText( $title );
 148                         }
 149                         if( $title instanceof Title ) {
 150                                 $output->addHTML( "<li>" . $skin->link( $title )
 151                                 . ' (' . $skin->link( $title->getTalkPage(), $talk ) . ")</li>\n" );
 152                         }
 153                 }
 154                 $output->addHTML( "</ul>\n" );
 155         }
 156
 157         /**
 158          * Count the number of titles on a user's watchlist, excluding talk pages
 159          *
 160          * @param $user User
 161          * @return int
 162          */
 163         private function countWatchlist( $user ) {
 164                 $dbr = wfGetDB( DB_MASTER );
 165                 $res = $dbr->select( 'watchlist', 'COUNT(*) AS count', array( 'wl_user' => $user->getId() ), __METHOD__ );
 166                 $row = $dbr->fetchObject( $res );
 167                 return ceil( $row->count / 2 ); // Paranoia
 168         }
 169
 170         /**
 171          * Prepare a list of titles on a user's watchlist (excluding talk pages)
 172          * and return an array of (prefixed) strings
 173          *
 174          * @param $user User
 175          * @return array
 176          */
 177         private function getWatchlist( $user ) {
 178                 $list = array();
 179                 $dbr = wfGetDB( DB_MASTER );
 180                 $res = $dbr->select(
 181                         'watchlist',
 182                         '*',
 183                         array(
 184                                 'wl_user' => $user->getId(),
 185                         ),
 186                         __METHOD__
 187                 );
 188                 if( $res->numRows() > 0 ) {
 189                         foreach ( $res as $row ) {
 190                                 $title = Title::makeTitleSafe( $row->wl_namespace, $row->wl_title );
 191                                 if( $title instanceof Title && !$title->isTalkPage() )
 192                                         $list[] = $title->getPrefixedText();
 193                         }
 194                         $res->free();
 195                 }
 196                 return $list;
 197         }
 198
 199         /**
 200          * Get a list of titles on a user's watchlist, excluding talk pages,
 201          * and return as a two-dimensional array with namespace, title and
 202          * redirect status
 203          *
 204          * @param $user User
 205          * @return array
 206          */
 207         private function getWatchlistInfo( $user ) {
 208                 $titles = array();
 209                 $dbr = wfGetDB( DB_MASTER );
 210
 211                 $res = $dbr->select(
 212                                         array( 'watchlist', 'page' ),
 213                                         array( 'wl_namespace', 'wl_title', 'page_id', 'page_len', 'page_is_redirect', 'page_latest' ),
 214                                         array( 'wl_user' => $user->getId() ),
 215                                         __METHOD__,
 216                                         $dbr->implicitOrderby() ? array( ) : array( 'ORDER BY' => 'wl_title' ),
 217                                         array( 'page' =>
 218                                                 array( 'LEFT JOIN', 'wl_namespace = page_namespace AND wl_title = page_title' ) )
 219                                 );
 220
 221                 if( $res && $dbr->numRows( $res ) > 0 ) {
 222                         $cache = LinkCache::singleton();
 223                         foreach ( $res as $row ) {
 224                                 $title = Title::makeTitleSafe( $row->wl_namespace, $row->wl_title );
 225                                 if( $title instanceof Title ) {
 226                                         // Update the link cache while we're at it
 227                                         if( $row->page_id ) {
 228                                                 $cache->addGoodLinkObj( $row->page_id, $title, $row->page_len, $row->page_is_redirect, $row->page_latest );
 229                                         } else {
 230                                                 $cache->addBadLinkObj( $title );
 231                                         }
 232                                         // Ignore non-talk
 233                                         if( !$title->isTalkPage() ) {
 234                                                 $titles[$row->wl_namespace][$row->wl_title] = $row->page_is_redirect;
 235                                         }
 236                                 }
 237                         }
 238                 }
 239                 return $titles;
 240         }
 241
 242         /**
 243          * Show a message indicating the number of items on the user's watchlist,
 244          * and return this count for additional checking
 245          *
 246          * @param $output OutputPage
 247          * @param $user User
 248          * @return int
 249          */
 250         private function showItemCount( $output, $user ) {
 251                 if( ( $count = $this->countWatchlist( $user ) ) > 0 ) {
 252                         $output->addHTML( wfMsgExt( 'watchlistedit-numitems', 'parse',
 253                                 $GLOBALS['wgLang']->formatNum( $count ) ) );
 254                 } else {
 255                         $output->addHTML( wfMsgExt( 'watchlistedit-noitems', 'parse' ) );
 256                 }
 257                 return $count;
 258         }
 259
 260         /**
 261          * Remove all titles from a user's watchlist
 262          *
 263          * @param $user User
 264          */
 265         private function clearWatchlist( $user ) {
 266                 $dbw = wfGetDB( DB_MASTER );
 267                 $dbw->delete( 'watchlist', array( 'wl_user' => $user->getId() ), __METHOD__ );
 268         }
 269
 270         /**
 271          * Add a list of titles to a user's watchlist
 272          *
 273          * $titles can be an array of strings or Title objects; the former
 274          * is preferred, since Titles are very memory-heavy
 275          *
 276          * @param $titles An array of strings, or Title objects
 277          * @param $user User
 278          */
 279         private function watchTitles( $titles, $user ) {
 280                 $dbw = wfGetDB( DB_MASTER );
 281                 $rows = array();
 282                 foreach( $titles as $title ) {
 283                         if( !$title instanceof Title ) {
 284                                 $title = Title::newFromText( $title );
 285                         }
 286                         if( $title instanceof Title ) {
 287                                 $rows[] = array(
 288                                         'wl_user' => $user->getId(),
 289                                         'wl_namespace' => ( $title->getNamespace() & ~1 ),
 290                                         'wl_title' => $title->getDBkey(),
 291                                         'wl_notificationtimestamp' => null,
 292                                 );
 293                                 $rows[] = array(
 294                                         'wl_user' => $user->getId(),
 295                                         'wl_namespace' => ( $title->getNamespace() | 1 ),
 296                                         'wl_title' => $title->getDBkey(),
 297                                         'wl_notificationtimestamp' => null,
 298                                 );
 299                         }
 300                 }
 301                 $dbw->insert( 'watchlist', $rows, __METHOD__, 'IGNORE' );
 302         }
 303
 304         /**
 305          * Remove a list of titles from a user's watchlist
 306          *
 307          * $titles can be an array of strings or Title objects; the former
 308          * is preferred, since Titles are very memory-heavy
 309          *
 310          * @param $titles An array of strings, or Title objects
 311          * @param $user User
 312          */
 313         private function unwatchTitles( $titles, $user ) {
 314                 $dbw = wfGetDB( DB_MASTER );
 315                 foreach( $titles as $title ) {
 316                         if( !$title instanceof Title ) {
 317                                 $title = Title::newFromText( $title );
 318                         }
 319                         if( $title instanceof Title ) {
 320                                 $dbw->delete(
 321                                         'watchlist',
 322                                         array(
 323                                                 'wl_user' => $user->getId(),
 324                                                 'wl_namespace' => ( $title->getNamespace() & ~1 ),
 325                                                 'wl_title' => $title->getDBkey(),
 326                                         ),
 327                                         __METHOD__
 328                                 );
 329                                 $dbw->delete(
 330                                         'watchlist',
 331                                         array(
 332                                                 'wl_user' => $user->getId(),
 333                                                 'wl_namespace' => ( $title->getNamespace() | 1 ),
 334                                                 'wl_title' => $title->getDBkey(),
 335                                         ),
 336                                         __METHOD__
 337                                 );
 338                                 $article = new Article($title);
 339                                 wfRunHooks('UnwatchArticleComplete',array(&$user,&$article));
 340                         }
 341                 }
 342         }
 343
 344         /**
 345          * Show the standard watchlist editing form
 346          *
 347          * @param $output OutputPage
 348          * @param $user User
 349          */
 350         private function showNormalForm( $output, $user ) {
 351                 global $wgUser;
 352                 $count = $this->showItemCount( $output, $user );
 353                 if( $count > 0 ) {
 354                         $self = SpecialPage::getTitleFor( 'Watchlist' );
 355                         $form  = Xml::openElement( 'form', array( 'method' => 'post',
 356                                 'action' => $self->getLocalUrl( array( 'action' => 'edit' ) ) ) );
 357                         $form .= Html::hidden( 'token', $wgUser->editToken( 'watchlistedit' ) );
 358                         $form .= "<fieldset>\n<legend>" . wfMsgHtml( 'watchlistedit-normal-legend' ) . "</legend>";
 359                         $form .= wfMsgExt( 'watchlistedit-normal-explain', 'parse' );
 360                         $form .= $this->buildRemoveList( $user, $wgUser->getSkin() );
 361                         $form .= '<p>' . Xml::submitButton( wfMsg( 'watchlistedit-normal-submit' ) ) . '</p>';
 362                         $form .= '</fieldset></form>';
 363                         $output->addHTML( $form );
 364                 }
 365         }
 366
 367         /**
 368          * Build the part of the standard watchlist editing form with the actual
 369          * title selection checkboxes and stuff.  Also generates a table of
 370          * contents if there's more than one heading.
 371          *
 372          * @param $user User
 373          * @param $skin Skin (really, Linker)
 374          */
 375         private function buildRemoveList( $user, $skin ) {
 376                 $list = "";
 377                 $toc = $skin->tocIndent();
 378                 $tocLength = 0;
 379                 foreach( $this->getWatchlistInfo( $user ) as $namespace => $pages ) {
 380                         $tocLength++;
 381                         $heading = htmlspecialchars( $this->getNamespaceHeading( $namespace ) );
 382                         $anchor = "editwatchlist-ns" . $namespace;
 383
 384                         $list .= $skin->makeHeadLine( 2, ">", $anchor, $heading, "" );
 385                         $toc .= $skin->tocLine( $anchor, $heading, $tocLength, 1 ) . $skin->tocLineEnd();
 386
 387                         $list .= "<ul>\n";
 388                         foreach( $pages as $dbkey => $redirect ) {
 389                                 $title = Title::makeTitleSafe( $namespace, $dbkey );
 390                                 $list .= $this->buildRemoveLine( $title, $redirect, $skin );
 391                         }
 392                         $list .= "</ul>\n";
 393                 }
 394                 // ISSUE: omit the TOC if the total number of titles is low?
 395                 if( $tocLength > 1 ) {
 396                         $list = $skin->tocList( $toc ) . $list;
 397                 }
 398                 return $list;
 399         }
 400
 401         /**
 402          * Get the correct "heading" for a namespace
 403          *
 404          * @param $namespace int
 405          * @return string
 406          */
 407         private function getNamespaceHeading( $namespace ) {
 408                 return $namespace == NS_MAIN
 409                         ? wfMsgHtml( 'blanknamespace' )
 410                         : htmlspecialchars( $GLOBALS['wgContLang']->getFormattedNsText( $namespace ) );
 411         }
 412
 413         /**
 414          * Build a single list item containing a check box selecting a title
 415          * and a link to that title, with various additional bits
 416          *
 417          * @param $title Title
 418          * @param $redirect bool
 419          * @param $skin Skin
 420          * @return string
 421          */
 422         private function buildRemoveLine( $title, $redirect, $skin ) {
 423                 global $wgLang;
 424
 425                 $link = $skin->link( $title );
 426                 if( $redirect ) {
 427                         $link = '<span class="watchlistredir">' . $link . '</span>';
 428                 }
 429                 $tools[] = $skin->link( $title->getTalkPage(), wfMsgHtml( 'talkpagelinktext' ) );
 430                 if( $title->exists() ) {
 431                         $tools[] = $skin->link(
 432                                 $title,
 433                                 wfMsgHtml( 'history_short' ),
 434                                 array(),
 435                                 array( 'action' => 'history' ),
 436                                 array( 'known', 'noclasses' )
 437                         );
 438                 }
 439                 if( $title->getNamespace() == NS_USER && !$title->isSubpage() ) {
 440                         $tools[] = $skin->link(
 441                                 SpecialPage::getTitleFor( 'Contributions', $title->getText() ),
 442                                 wfMsgHtml( 'contributions' ),
 443                                 array(),
 444                                 array(),
 445                                 array( 'known', 'noclasses' )
 446                         );
 447                 }
 448
 449                 wfRunHooks( 'WatchlistEditorBuildRemoveLine', array( &$tools, $title, $redirect, $skin ) );
 450
 451                 return "<li>"
 452                         . Xml::check( 'titles[]', false, array( 'value' => $title->getPrefixedText() ) )
 453                         . $link . " (" . $wgLang->pipeList( $tools ) . ")" . "</li>\n";
 454         }
 455
 456         /**
 457          * Show a form for editing the watchlist in "raw" mode
 458          *
 459          * @param $output OutputPage
 460          * @param $user User
 461          */
 462         public function showRawForm( $output, $user ) {
 463                 global $wgUser;
 464                 $this->showItemCount( $output, $user );
 465                 $self = SpecialPage::getTitleFor( 'Watchlist' );
 466                 $form = Xml::openElement( 'form', array( 'method' => 'post',
 467                         'action' => $self->getLocalUrl( array( 'action' => 'raw' ) ) ) );
 468                 $form .= Html::hidden( 'token', $wgUser->editToken( 'watchlistedit' ) );
 469                 $form .= '<fieldset><legend>' . wfMsgHtml( 'watchlistedit-raw-legend' ) . '</legend>';
 470                 $form .= wfMsgExt( 'watchlistedit-raw-explain', 'parse' );
 471                 $form .= Xml::label( wfMsg( 'watchlistedit-raw-titles' ), 'titles' );
 472                 $form .= "<br />\n";
 473                 $form .= Xml::openElement( 'textarea', array( 'id' => 'titles', 'name' => 'titles',
 474                         'rows' => $wgUser->getIntOption( 'rows' ), 'cols' => $wgUser->getIntOption( 'cols' ) ) );
 475                 $titles = $this->getWatchlist( $user );
 476                 foreach( $titles as $title ) {
 477                         $form .= htmlspecialchars( $title ) . "\n";
 478                 }
 479                 $form .= '</textarea>';
 480                 $form .= '<p>' . Xml::submitButton( wfMsg( 'watchlistedit-raw-submit' ) ) . '</p>';
 481                 $form .= '</fieldset></form>';
 482                 $output->addHTML( $form );
 483         }
 484
 485         /**
 486          * Determine whether we are editing the watchlist, and if so, what
 487          * kind of editing operation
 488          *
 489          * @param $request WebRequest
 490          * @param $par mixed
 491          * @return int
 492          */
 493         public static function getMode( $request, $par ) {
 494                 $mode = strtolower( $request->getVal( 'action', $par ) );
 495                 switch( $mode ) {
 496                         case 'clear':
 497                                 return self::EDIT_CLEAR;
 498                         case 'raw':
 499                                 return self::EDIT_RAW;
 500                         case 'edit':
 501                                 return self::EDIT_NORMAL;
 502                         default:
 503                                 return false;
 504                 }
 505         }
 506
 507         /**
 508          * Build a set of links for convenient navigation
 509          * between watchlist viewing and editing modes
 510          *
 511          * @param $skin Skin to use
 512          * @return string
 513          */
 514         public static function buildTools( $skin ) {
 515                 global $wgLang;
 516
 517                 $tools = array();
 518                 $modes = array( 'view' => false, 'edit' => 'edit', 'raw' => 'raw' );
 519                 foreach( $modes as $mode => $subpage ) {
 520                         // can use messages 'watchlisttools-view', 'watchlisttools-edit', 'watchlisttools-raw'
 521                         $tools[] = $skin->linkKnown(
 522                                 SpecialPage::getTitleFor( 'Watchlist', $subpage ),
 523                                 wfMsgHtml( "watchlisttools-{$mode}" )
 524                         );
 525                 }
 526                 return Html::rawElement( 'span',
 527                                         array( 'class' => 'mw-watchlist-toollinks' ),
 528                                         wfMsg( 'parentheses', $wgLang->pipeList( $tools ) ) );
 529         }
 530 }