includes/skins/Skin.php

   1 <?php
   2 /**
   3  * Base class for all skins.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * @defgroup Skins Skins
  25  */
  26
  27 /**
  28  * The main skin class which provides methods and properties for all other skins.
  29  *
  30  * See docs/skin.txt for more information.
  31  *
  32  * @ingroup Skins
  33  */
  34 abstract class Skin extends ContextSource {
  35         protected $skinname = null;
  36         protected $mRelevantTitle = null;
  37         protected $mRelevantUser = null;
  38
  39         /**
  40          * @var string Stylesheets set to use. Subdirectory in skins/ where various stylesheets are
  41          *   located. Only needs to be set if you intend to use the getSkinStylePath() method.
  42          */
  43         public $stylename = null;
  44
  45         /**
  46          * Fetch the set of available skins.
  47          * @return array Associative array of strings
  48          */
  49         static function getSkinNames() {
  50                 return SkinFactory::getDefaultInstance()->getSkinNames();
  51         }
  52
  53         /**
  54          * Fetch the skinname messages for available skins.
  55          * @return string[]
  56          */
  57         static function getSkinNameMessages() {
  58                 $messages = [];
  59                 foreach ( self::getSkinNames() as $skinKey => $skinName ) {
  60                         $messages[] = "skinname-$skinKey";
  61                 }
  62                 return $messages;
  63         }
  64
  65         /**
  66          * Fetch the list of user-selectable skins in regards to $wgSkipSkins.
  67          * Useful for Special:Preferences and other places where you
  68          * only want to show skins users _can_ use.
  69          * @return string[]
  70          * @since 1.23
  71          */
  72         public static function getAllowedSkins() {
  73                 global $wgSkipSkins;
  74
  75                 $allowedSkins = self::getSkinNames();
  76
  77                 foreach ( $wgSkipSkins as $skip ) {
  78                         unset( $allowedSkins[$skip] );
  79                 }
  80
  81                 return $allowedSkins;
  82         }
  83
  84         /**
  85          * @deprecated since 1.23, use getAllowedSkins
  86          * @return string[]
  87          */
  88         public static function getUsableSkins() {
  89                 wfDeprecated( __METHOD__, '1.23' );
  90                 return self::getAllowedSkins();
  91         }
  92
  93         /**
  94          * Normalize a skin preference value to a form that can be loaded.
  95          *
  96          * If a skin can't be found, it will fall back to the configured default ($wgDefaultSkin), or the
  97          * hardcoded default ($wgFallbackSkin) if the default skin is unavailable too.
  98          *
  99          * @param string $key 'monobook', 'vector', etc.
 100          * @return string
 101          */
 102         static function normalizeKey( $key ) {
 103                 global $wgDefaultSkin, $wgFallbackSkin;
 104
 105                 $skinNames = Skin::getSkinNames();
 106
 107                 // Make keys lowercase for case-insensitive matching.
 108                 $skinNames = array_change_key_case( $skinNames, CASE_LOWER );
 109                 $key = strtolower( $key );
 110                 $defaultSkin = strtolower( $wgDefaultSkin );
 111                 $fallbackSkin = strtolower( $wgFallbackSkin );
 112
 113                 if ( $key == '' || $key == 'default' ) {
 114                         // Don't return the default immediately;
 115                         // in a misconfiguration we need to fall back.
 116                         $key = $defaultSkin;
 117                 }
 118
 119                 if ( isset( $skinNames[$key] ) ) {
 120                         return $key;
 121                 }
 122
 123                 // Older versions of the software used a numeric setting
 124                 // in the user preferences.
 125                 $fallback = [
 126                         0 => $defaultSkin,
 127                         2 => 'cologneblue'
 128                 ];
 129
 130                 if ( isset( $fallback[$key] ) ) {
 131                         $key = $fallback[$key];
 132                 }
 133
 134                 if ( isset( $skinNames[$key] ) ) {
 135                         return $key;
 136                 } elseif ( isset( $skinNames[$defaultSkin] ) ) {
 137                         return $defaultSkin;
 138                 } else {
 139                         return $fallbackSkin;
 140                 }
 141         }
 142
 143         /**
 144          * Factory method for loading a skin of a given type
 145          * @param string $key 'monobook', 'vector', etc.
 146          * @return Skin
 147          * @deprecated since 1.24; Use SkinFactory instead
 148          */
 149         static function &newFromKey( $key ) {
 150                 wfDeprecated( __METHOD__, '1.24' );
 151
 152                 $key = Skin::normalizeKey( $key );
 153                 $factory = SkinFactory::getDefaultInstance();
 154
 155                 // normalizeKey() guarantees that a skin with this key will exist.
 156                 $skin = $factory->makeSkin( $key );
 157                 return $skin;
 158         }
 159
 160         /**
 161          * @return string Skin name
 162          */
 163         public function getSkinName() {
 164                 return $this->skinname;
 165         }
 166
 167         /**
 168          * @param OutputPage $out
 169          */
 170         function initPage( OutputPage $out ) {
 171
 172                 $this->preloadExistence();
 173
 174         }
 175
 176         /**
 177          * Defines the ResourceLoader modules that should be added to the skin
 178          * It is recommended that skins wishing to override call parent::getDefaultModules()
 179          * and substitute out any modules they wish to change by using a key to look them up
 180          * @return array Array of modules with helper keys for easy overriding
 181          */
 182         public function getDefaultModules() {
 183                 global $wgUseAjax, $wgEnableAPI, $wgEnableWriteAPI;
 184
 185                 $out = $this->getOutput();
 186                 $user = $out->getUser();
 187                 $modules = [
 188                         // modules that enhance the page content in some way
 189                         'content' => [
 190                                 'mediawiki.page.ready',
 191                         ],
 192                         // modules that exist for legacy reasons
 193                         'legacy' => ResourceLoaderStartUpModule::getLegacyModules(),
 194                         // modules relating to search functionality
 195                         'search' => [],
 196                         // modules relating to functionality relating to watching an article
 197                         'watch' => [],
 198                         // modules which relate to the current users preferences
 199                         'user' => [],
 200                 ];
 201
 202                 // Add various resources if required
 203                 if ( $wgUseAjax && $wgEnableAPI ) {
 204                         if ( $wgEnableWriteAPI && $user->isLoggedIn()
 205                                 && $user->isAllowedAll( 'writeapi', 'viewmywatchlist', 'editmywatchlist' )
 206                                 && $this->getRelevantTitle()->canExist()
 207                         ) {
 208                                 $modules['watch'][] = 'mediawiki.page.watch.ajax';
 209                         }
 210
 211                         $modules['search'][] = 'mediawiki.searchSuggest';
 212                 }
 213
 214                 if ( $user->getBoolOption( 'editsectiononrightclick' ) ) {
 215                         $modules['user'][] = 'mediawiki.action.view.rightClickEdit';
 216                 }
 217
 218                 // Crazy edit-on-double-click stuff
 219                 if ( $out->isArticle() && $user->getOption( 'editondblclick' ) ) {
 220                         $modules['user'][] = 'mediawiki.action.view.dblClickEdit';
 221                 }
 222                 return $modules;
 223         }
 224
 225         /**
 226          * Preload the existence of three commonly-requested pages in a single query
 227          */
 228         function preloadExistence() {
 229                 $titles = [];
 230
 231                 $user = $this->getUser();
 232                 $title = $this->getRelevantTitle();
 233
 234                 // User/talk link
 235                 if ( $user->isLoggedIn() ) {
 236                         $titles[] = $user->getUserPage();
 237                         $titles[] = $user->getTalkPage();
 238                 }
 239
 240                 // Check, if the page can hold some kind of content, otherwise do nothing
 241                 if ( !$title->canExist() ) {
 242                         // nothing
 243                 } elseif ( $title->isTalkPage() ) {
 244                         $titles[] = $title->getSubjectPage();
 245                 } else {
 246                         $titles[] = $title->getTalkPage();
 247                 }
 248
 249                 Hooks::run( 'SkinPreloadExistence', [ &$titles, $this ] );
 250
 251                 if ( count( $titles ) ) {
 252                         $lb = new LinkBatch( $titles );
 253                         $lb->setCaller( __METHOD__ );
 254                         $lb->execute();
 255                 }
 256         }
 257
 258         /**
 259          * Get the current revision ID
 260          *
 261          * @return int
 262          */
 263         public function getRevisionId() {
 264                 return $this->getOutput()->getRevisionId();
 265         }
 266
 267         /**
 268          * Whether the revision displayed is the latest revision of the page
 269          *
 270          * @return bool
 271          */
 272         public function isRevisionCurrent() {
 273                 $revID = $this->getRevisionId();
 274                 return $revID == 0 || $revID == $this->getTitle()->getLatestRevID();
 275         }
 276
 277         /**
 278          * Set the "relevant" title
 279          * @see self::getRelevantTitle()
 280          * @param Title $t
 281          */
 282         public function setRelevantTitle( $t ) {
 283                 $this->mRelevantTitle = $t;
 284         }
 285
 286         /**
 287          * Return the "relevant" title.
 288          * A "relevant" title is not necessarily the actual title of the page.
 289          * Special pages like Special:MovePage use set the page they are acting on
 290          * as their "relevant" title, this allows the skin system to display things
 291          * such as content tabs which belong to to that page instead of displaying
 292          * a basic special page tab which has almost no meaning.
 293          *
 294          * @return Title
 295          */
 296         public function getRelevantTitle() {
 297                 if ( isset( $this->mRelevantTitle ) ) {
 298                         return $this->mRelevantTitle;
 299                 }
 300                 return $this->getTitle();
 301         }
 302
 303         /**
 304          * Set the "relevant" user
 305          * @see self::getRelevantUser()
 306          * @param User $u
 307          */
 308         public function setRelevantUser( $u ) {
 309                 $this->mRelevantUser = $u;
 310         }
 311
 312         /**
 313          * Return the "relevant" user.
 314          * A "relevant" user is similar to a relevant title. Special pages like
 315          * Special:Contributions mark the user which they are relevant to so that
 316          * things like the toolbox can display the information they usually are only
 317          * able to display on a user's userpage and talkpage.
 318          * @return User
 319          */
 320         public function getRelevantUser() {
 321                 if ( isset( $this->mRelevantUser ) ) {
 322                         return $this->mRelevantUser;
 323                 }
 324                 $title = $this->getRelevantTitle();
 325                 if ( $title->hasSubjectNamespace( NS_USER ) ) {
 326                         $rootUser = $title->getRootText();
 327                         if ( User::isIP( $rootUser ) ) {
 328                                 $this->mRelevantUser = User::newFromName( $rootUser, false );
 329                         } else {
 330                                 $user = User::newFromName( $rootUser, false );
 331
 332                                 if ( $user ) {
 333                                         $user->load( User::READ_NORMAL );
 334
 335                                         if ( $user->isLoggedIn() ) {
 336                                                 $this->mRelevantUser = $user;
 337                                         }
 338                                 }
 339                         }
 340                         return $this->mRelevantUser;
 341                 }
 342                 return null;
 343         }
 344
 345         /**
 346          * Outputs the HTML generated by other functions.
 347          * @param OutputPage $out
 348          */
 349         abstract function outputPage( OutputPage $out = null );
 350
 351         /**
 352          * @param array $data
 353          * @return string
 354          */
 355         static function makeVariablesScript( $data ) {
 356                 if ( $data ) {
 357                         return ResourceLoader::makeInlineScript(
 358                                 ResourceLoader::makeConfigSetScript( $data )
 359                         );
 360                 } else {
 361                         return '';
 362                 }
 363         }
 364
 365         /**
 366          * Get the query to generate a dynamic stylesheet
 367          *
 368          * @return array
 369          */
 370         public static function getDynamicStylesheetQuery() {
 371                 global $wgSquidMaxage;
 372
 373                 return [
 374                                 'action' => 'raw',
 375                                 'maxage' => $wgSquidMaxage,
 376                                 'usemsgcache' => 'yes',
 377                                 'ctype' => 'text/css',
 378                                 'smaxage' => $wgSquidMaxage,
 379                         ];
 380         }
 381
 382         /**
 383          * Add skin specific stylesheets
 384          * Calling this method with an $out of anything but the same OutputPage
 385          * inside ->getOutput() is deprecated. The $out arg is kept
 386          * for compatibility purposes with skins.
 387          * @param OutputPage $out
 388          * @todo delete
 389          */
 390         abstract function setupSkinUserCss( OutputPage $out );
 391
 392         /**
 393          * TODO: document
 394          * @param Title $title
 395          * @return string
 396          */
 397         function getPageClasses( $title ) {
 398                 $numeric = 'ns-' . $title->getNamespace();
 399
 400                 if ( $title->isSpecialPage() ) {
 401                         $type = 'ns-special';
 402                         // bug 23315: provide a class based on the canonical special page name without subpages
 403                         list( $canonicalName ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 404                         if ( $canonicalName ) {
 405                                 $type .= ' ' . Sanitizer::escapeClass( "mw-special-$canonicalName" );
 406                         } else {
 407                                 $type .= ' mw-invalidspecialpage';
 408                         }
 409                 } elseif ( $title->isTalkPage() ) {
 410                         $type = 'ns-talk';
 411                 } else {
 412                         $type = 'ns-subject';
 413                 }
 414
 415                 $name = Sanitizer::escapeClass( 'page-' . $title->getPrefixedText() );
 416
 417                 return "$numeric $type $name";
 418         }
 419
 420         /**
 421          * Return values for <html> element
 422          * @return array Array of associative name-to-value elements for <html> element
 423          */
 424         public function getHtmlElementAttributes() {
 425                 $lang = $this->getLanguage();
 426                 return [
 427                         'lang' => $lang->getHtmlCode(),
 428                         'dir' => $lang->getDir(),
 429                         'class' => 'client-nojs',
 430                 ];
 431         }
 432
 433         /**
 434          * This will be called by OutputPage::headElement when it is creating the
 435          * "<body>" tag, skins can override it if they have a need to add in any
 436          * body attributes or classes of their own.
 437          * @param OutputPage $out
 438          * @param array $bodyAttrs
 439          */
 440         function addToBodyAttributes( $out, &$bodyAttrs ) {
 441                 // does nothing by default
 442         }
 443
 444         /**
 445          * URL to the logo
 446          * @return string
 447          */
 448         function getLogo() {
 449                 global $wgLogo;
 450                 return $wgLogo;
 451         }
 452
 453         /**
 454          * @return string HTML
 455          */
 456         function getCategoryLinks() {
 457                 global $wgUseCategoryBrowser;
 458
 459                 $out = $this->getOutput();
 460                 $allCats = $out->getCategoryLinks();
 461
 462                 if ( !count( $allCats ) ) {
 463                         return '';
 464                 }
 465
 466                 $embed = "<li>";
 467                 $pop = "</li>";
 468
 469                 $s = '';
 470                 $colon = $this->msg( 'colon-separator' )->escaped();
 471
 472                 if ( !empty( $allCats['normal'] ) ) {
 473                         $t = $embed . implode( "{$pop}{$embed}", $allCats['normal'] ) . $pop;
 474
 475                         $msg = $this->msg( 'pagecategories' )->numParams( count( $allCats['normal'] ) )->escaped();
 476                         $linkPage = wfMessage( 'pagecategorieslink' )->inContentLanguage()->text();
 477                         $title = Title::newFromText( $linkPage );
 478                         $link = $title ? Linker::link( $title, $msg ) : $msg;
 479                         $s .= '<div id="mw-normal-catlinks" class="mw-normal-catlinks">' .
 480                                 $link . $colon . '<ul>' . $t . '</ul>' . '</div>';
 481                 }
 482
 483                 # Hidden categories
 484                 if ( isset( $allCats['hidden'] ) ) {
 485                         if ( $this->getUser()->getBoolOption( 'showhiddencats' ) ) {
 486                                 $class = ' mw-hidden-cats-user-shown';
 487                         } elseif ( $this->getTitle()->getNamespace() == NS_CATEGORY ) {
 488                                 $class = ' mw-hidden-cats-ns-shown';
 489                         } else {
 490                                 $class = ' mw-hidden-cats-hidden';
 491                         }
 492
 493                         $s .= "<div id=\"mw-hidden-catlinks\" class=\"mw-hidden-catlinks$class\">" .
 494                                 $this->msg( 'hidden-categories' )->numParams( count( $allCats['hidden'] ) )->escaped() .
 495                                 $colon . '<ul>' . $embed . implode( "{$pop}{$embed}", $allCats['hidden'] ) . $pop . '</ul>' .
 496                                 '</div>';
 497                 }
 498
 499                 # optional 'dmoz-like' category browser. Will be shown under the list
 500                 # of categories an article belong to
 501                 if ( $wgUseCategoryBrowser ) {
 502                         $s .= '<br /><hr />';
 503
 504                         # get a big array of the parents tree
 505                         $parenttree = $this->getTitle()->getParentCategoryTree();
 506                         # Skin object passed by reference cause it can not be
 507                         # accessed under the method subfunction drawCategoryBrowser
 508                         $tempout = explode( "\n", $this->drawCategoryBrowser( $parenttree ) );
 509                         # Clean out bogus first entry and sort them
 510                         unset( $tempout[0] );
 511                         asort( $tempout );
 512                         # Output one per line
 513                         $s .= implode( "<br />\n", $tempout );
 514                 }
 515
 516                 return $s;
 517         }
 518
 519         /**
 520          * Render the array as a series of links.
 521          * @param array $tree Categories tree returned by Title::getParentCategoryTree
 522          * @return string Separated by &gt;, terminate with "\n"
 523          */
 524         function drawCategoryBrowser( $tree ) {
 525                 $return = '';
 526
 527                 foreach ( $tree as $element => $parent ) {
 528                         if ( empty( $parent ) ) {
 529                                 # element start a new list
 530                                 $return .= "\n";
 531                         } else {
 532                                 # grab the others elements
 533                                 $return .= $this->drawCategoryBrowser( $parent ) . ' &gt; ';
 534                         }
 535
 536                         # add our current element to the list
 537                         $eltitle = Title::newFromText( $element );
 538                         $return .= Linker::link( $eltitle, htmlspecialchars( $eltitle->getText() ) );
 539                 }
 540
 541                 return $return;
 542         }
 543
 544         /**
 545          * @return string HTML
 546          */
 547         function getCategories() {
 548                 $out = $this->getOutput();
 549                 $catlinks = $this->getCategoryLinks();
 550
 551                 // Check what we're showing
 552                 $allCats = $out->getCategoryLinks();
 553                 $showHidden = $this->getUser()->getBoolOption( 'showhiddencats' ) ||
 554                                                 $this->getTitle()->getNamespace() == NS_CATEGORY;
 555
 556                 $classes = [ 'catlinks' ];
 557                 if ( empty( $allCats['normal'] ) && !( !empty( $allCats['hidden'] ) && $showHidden ) ) {
 558                         $classes[] = 'catlinks-allhidden';
 559                 }
 560
 561                 return Html::rawElement(
 562                         'div',
 563                         [ 'id' => 'catlinks', 'class' => $classes, 'data-mw' => 'interface' ],
 564                         $catlinks
 565                 );
 566         }
 567
 568         /**
 569          * This runs a hook to allow extensions placing their stuff after content
 570          * and article metadata (e.g. categories).
 571          * Note: This function has nothing to do with afterContent().
 572          *
 573          * This hook is placed here in order to allow using the same hook for all
 574          * skins, both the SkinTemplate based ones and the older ones, which directly
 575          * use this class to get their data.
 576          *
 577          * The output of this function gets processed in SkinTemplate::outputPage() for
 578          * the SkinTemplate based skins, all other skins should directly echo it.
 579          *
 580          * @return string Empty by default, if not changed by any hook function.
 581          */
 582         protected function afterContentHook() {
 583                 $data = '';
 584
 585                 if ( Hooks::run( 'SkinAfterContent', [ &$data, $this ] ) ) {
 586                         // adding just some spaces shouldn't toggle the output
 587                         // of the whole <div/>, so we use trim() here
 588                         if ( trim( $data ) != '' ) {
 589                                 // Doing this here instead of in the skins to
 590                                 // ensure that the div has the same ID in all
 591                                 // skins
 592                                 $data = "<div id='mw-data-after-content'>\n" .
 593                                         "\t$data\n" .
 594                                         "</div>\n";
 595                         }
 596                 } else {
 597                         wfDebug( "Hook SkinAfterContent changed output processing.\n" );
 598                 }
 599
 600                 return $data;
 601         }
 602
 603         /**
 604          * Generate debug data HTML for displaying at the bottom of the main content
 605          * area.
 606          * @return string HTML containing debug data, if enabled (otherwise empty).
 607          */
 608         protected function generateDebugHTML() {
 609                 return MWDebug::getHTMLDebugLog();
 610         }
 611
 612         /**
 613          * This gets called shortly before the "</body>" tag.
 614          *
 615          * @return string HTML-wrapped JS code to be put before "</body>"
 616          */
 617         function bottomScripts() {
 618                 // TODO and the suckage continues. This function is really just a wrapper around
 619                 // OutputPage::getBottomScripts() which takes a Skin param. This should be cleaned
 620                 // up at some point
 621                 $bottomScriptText = $this->getOutput()->getBottomScripts();
 622                 Hooks::run( 'SkinAfterBottomScripts', [ $this, &$bottomScriptText ] );
 623
 624                 return $bottomScriptText;
 625         }
 626
 627         /**
 628          * Text with the permalink to the source page,
 629          * usually shown on the footer of a printed page
 630          *
 631          * @return string HTML text with an URL
 632          */
 633         function printSource() {
 634                 $oldid = $this->getRevisionId();
 635                 if ( $oldid ) {
 636                         $canonicalUrl = $this->getTitle()->getCanonicalURL( 'oldid=' . $oldid );
 637                         $url = htmlspecialchars( wfExpandIRI( $canonicalUrl ) );
 638                 } else {
 639                         // oldid not available for non existing pages
 640                         $url = htmlspecialchars( wfExpandIRI( $this->getTitle()->getCanonicalURL() ) );
 641                 }
 642
 643                 return $this->msg( 'retrievedfrom' )
 644                         ->rawParams( '<a dir="ltr" href="' . $url . '">' . $url . '</a>' )
 645                         ->parse();
 646         }
 647
 648         /**
 649          * @return string HTML
 650          */
 651         function getUndeleteLink() {
 652                 $action = $this->getRequest()->getVal( 'action', 'view' );
 653
 654                 if ( $this->getTitle()->userCan( 'deletedhistory', $this->getUser() ) &&
 655                         ( !$this->getTitle()->exists() || $action == 'history' ) ) {
 656                         $n = $this->getTitle()->isDeleted();
 657
 658                         if ( $n ) {
 659                                 if ( $this->getTitle()->quickUserCan( 'undelete', $this->getUser() ) ) {
 660                                         $msg = 'thisisdeleted';
 661                                 } else {
 662                                         $msg = 'viewdeleted';
 663                                 }
 664
 665                                 return $this->msg( $msg )->rawParams(
 666                                         Linker::linkKnown(
 667                                                 SpecialPage::getTitleFor( 'Undelete', $this->getTitle()->getPrefixedDBkey() ),
 668                                                 $this->msg( 'restorelink' )->numParams( $n )->escaped() )
 669                                         )->escaped();
 670                         }
 671                 }
 672
 673                 return '';
 674         }
 675
 676         /**
 677          * @return string
 678          */
 679         function subPageSubtitle() {
 680                 $out = $this->getOutput();
 681                 $subpages = '';
 682
 683                 if ( !Hooks::run( 'SkinSubPageSubtitle', [ &$subpages, $this, $out ] ) ) {
 684                         return $subpages;
 685                 }
 686
 687                 if ( $out->isArticle() && MWNamespace::hasSubpages( $out->getTitle()->getNamespace() ) ) {
 688                         $ptext = $this->getTitle()->getPrefixedText();
 689                         if ( preg_match( '/\//', $ptext ) ) {
 690                                 $links = explode( '/', $ptext );
 691                                 array_pop( $links );
 692                                 $c = 0;
 693                                 $growinglink = '';
 694                                 $display = '';
 695                                 $lang = $this->getLanguage();
 696
 697                                 foreach ( $links as $link ) {
 698                                         $growinglink .= $link;
 699                                         $display .= $link;
 700                                         $linkObj = Title::newFromText( $growinglink );
 701
 702                                         if ( is_object( $linkObj ) && $linkObj->isKnown() ) {
 703                                                 $getlink = Linker::linkKnown(
 704                                                         $linkObj,
 705                                                         htmlspecialchars( $display )
 706                                                 );
 707
 708                                                 $c++;
 709
 710                                                 if ( $c > 1 ) {
 711                                                         $subpages .= $lang->getDirMarkEntity() . $this->msg( 'pipe-separator' )->escaped();
 712                                                 } else {
 713                                                         $subpages .= '&lt; ';
 714                                                 }
 715
 716                                                 $subpages .= $getlink;
 717                                                 $display = '';
 718                                         } else {
 719                                                 $display .= '/';
 720                                         }
 721                                         $growinglink .= '/';
 722                                 }
 723                         }
 724                 }
 725
 726                 return $subpages;
 727         }
 728
 729         /**
 730          * @deprecated since 1.27, feature removed
 731          * @return bool Always false
 732          */
 733         function showIPinHeader() {
 734                 wfDeprecated( __METHOD__, '1.27' );
 735                 return false;
 736         }
 737
 738         /**
 739          * @return string
 740          */
 741         function getSearchLink() {
 742                 $searchPage = SpecialPage::getTitleFor( 'Search' );
 743                 return $searchPage->getLocalURL();
 744         }
 745
 746         /**
 747          * @return string
 748          */
 749         function escapeSearchLink() {
 750                 return htmlspecialchars( $this->getSearchLink() );
 751         }
 752
 753         /**
 754          * @param string $type
 755          * @return string
 756          */
 757         function getCopyright( $type = 'detect' ) {
 758                 global $wgRightsPage, $wgRightsUrl, $wgRightsText;
 759
 760                 if ( $type == 'detect' ) {
 761                         if ( !$this->isRevisionCurrent()
 762                                 && !$this->msg( 'history_copyright' )->inContentLanguage()->isDisabled()
 763                         ) {
 764                                 $type = 'history';
 765                         } else {
 766                                 $type = 'normal';
 767                         }
 768                 }
 769
 770                 if ( $type == 'history' ) {
 771                         $msg = 'history_copyright';
 772                 } else {
 773                         $msg = 'copyright';
 774                 }
 775
 776                 if ( $wgRightsPage ) {
 777                         $title = Title::newFromText( $wgRightsPage );
 778                         $link = Linker::linkKnown( $title, $wgRightsText );
 779                 } elseif ( $wgRightsUrl ) {
 780                         $link = Linker::makeExternalLink( $wgRightsUrl, $wgRightsText );
 781                 } elseif ( $wgRightsText ) {
 782                         $link = $wgRightsText;
 783                 } else {
 784                         # Give up now
 785                         return '';
 786                 }
 787
 788                 // Allow for site and per-namespace customization of copyright notice.
 789                 // @todo Remove deprecated $forContent param from hook handlers and then remove here.
 790                 $forContent = true;
 791
 792                 Hooks::run(
 793                         'SkinCopyrightFooter',
 794                         [ $this->getTitle(), $type, &$msg, &$link, &$forContent ]
 795                 );
 796
 797                 return $this->msg( $msg )->rawParams( $link )->text();
 798         }
 799
 800         /**
 801          * @return null|string
 802          */
 803         function getCopyrightIcon() {
 804                 global $wgRightsUrl, $wgRightsText, $wgRightsIcon, $wgFooterIcons;
 805
 806                 $out = '';
 807
 808                 if ( $wgFooterIcons['copyright']['copyright'] ) {
 809                         $out = $wgFooterIcons['copyright']['copyright'];
 810                 } elseif ( $wgRightsIcon ) {
 811                         $icon = htmlspecialchars( $wgRightsIcon );
 812
 813                         if ( $wgRightsUrl ) {
 814                                 $url = htmlspecialchars( $wgRightsUrl );
 815                                 $out .= '<a href="' . $url . '">';
 816                         }
 817
 818                         $text = htmlspecialchars( $wgRightsText );
 819                         $out .= "<img src=\"$icon\" alt=\"$text\" width=\"88\" height=\"31\" />";
 820
 821                         if ( $wgRightsUrl ) {
 822                                 $out .= '</a>';
 823                         }
 824                 }
 825
 826                 return $out;
 827         }
 828
 829         /**
 830          * Gets the powered by MediaWiki icon.
 831          * @return string
 832          */
 833         function getPoweredBy() {
 834                 global $wgResourceBasePath;
 835
 836                 $url1 = htmlspecialchars(
 837                         "$wgResourceBasePath/resources/assets/poweredby_mediawiki_88x31.png"
 838                 );
 839                 $url1_5 = htmlspecialchars(
 840                         "$wgResourceBasePath/resources/assets/poweredby_mediawiki_132x47.png"
 841                 );
 842                 $url2 = htmlspecialchars(
 843                         "$wgResourceBasePath/resources/assets/poweredby_mediawiki_176x62.png"
 844                 );
 845                 $text = '<a href="//www.mediawiki.org/"><img src="' . $url1
 846                         . '" srcset="' . $url1_5 . ' 1.5x, ' . $url2 . ' 2x" '
 847                         . 'height="31" width="88" alt="Powered by MediaWiki" /></a>';
 848                 Hooks::run( 'SkinGetPoweredBy', [ &$text, $this ] );
 849                 return $text;
 850         }
 851
 852         /**
 853          * Get the timestamp of the latest revision, formatted in user language
 854          *
 855          * @return string
 856          */
 857         protected function lastModified() {
 858                 $timestamp = $this->getOutput()->getRevisionTimestamp();
 859
 860                 # No cached timestamp, load it from the database
 861                 if ( $timestamp === null ) {
 862                         $timestamp = Revision::getTimestampFromId( $this->getTitle(), $this->getRevisionId() );
 863                 }
 864
 865                 if ( $timestamp ) {
 866                         $d = $this->getLanguage()->userDate( $timestamp, $this->getUser() );
 867                         $t = $this->getLanguage()->userTime( $timestamp, $this->getUser() );
 868                         $s = ' ' . $this->msg( 'lastmodifiedat', $d, $t )->parse();
 869                 } else {
 870                         $s = '';
 871                 }
 872
 873                 if ( wfGetLB()->getLaggedSlaveMode() ) {
 874                         $s .= ' <strong>' . $this->msg( 'laggedslavemode' )->parse() . '</strong>';
 875                 }
 876
 877                 return $s;
 878         }
 879
 880         /**
 881          * @param string $align
 882          * @return string
 883          */
 884         function logoText( $align = '' ) {
 885                 if ( $align != '' ) {
 886                         $a = " style='float: {$align};'";
 887                 } else {
 888                         $a = '';
 889                 }
 890
 891                 $mp = $this->msg( 'mainpage' )->escaped();
 892                 $mptitle = Title::newMainPage();
 893                 $url = ( is_object( $mptitle ) ? htmlspecialchars( $mptitle->getLocalURL() ) : '' );
 894
 895                 $logourl = $this->getLogo();
 896                 $s = "<a href='{$url}'><img{$a} src='{$logourl}' alt='[{$mp}]' /></a>";
 897
 898                 return $s;
 899         }
 900
 901         /**
 902          * Renders a $wgFooterIcons icon according to the method's arguments
 903          * @param array $icon The icon to build the html for, see $wgFooterIcons
 904          *   for the format of this array.
 905          * @param bool|string $withImage Whether to use the icon's image or output
 906          *   a text-only footericon.
 907          * @return string HTML
 908          */
 909         function makeFooterIcon( $icon, $withImage = 'withImage' ) {
 910                 if ( is_string( $icon ) ) {
 911                         $html = $icon;
 912                 } else { // Assuming array
 913                         $url = isset( $icon["url"] ) ? $icon["url"] : null;
 914                         unset( $icon["url"] );
 915                         if ( isset( $icon["src"] ) && $withImage === 'withImage' ) {
 916                                 // do this the lazy way, just pass icon data as an attribute array
 917                                 $html = Html::element( 'img', $icon );
 918                         } else {
 919                                 $html = htmlspecialchars( $icon["alt"] );
 920                         }
 921                         if ( $url ) {
 922                                 $html = Html::rawElement( 'a', [ "href" => $url ], $html );
 923                         }
 924                 }
 925                 return $html;
 926         }
 927
 928         /**
 929          * Gets the link to the wiki's main page.
 930          * @return string
 931          */
 932         function mainPageLink() {
 933                 $s = Linker::linkKnown(
 934                         Title::newMainPage(),
 935                         $this->msg( 'mainpage' )->escaped()
 936                 );
 937
 938                 return $s;
 939         }
 940
 941         /**
 942          * Returns an HTML link for use in the footer
 943          * @param string $desc The i18n message key for the link text
 944          * @param string $page The i18n message key for the page to link to
 945          * @return string HTML anchor
 946          */
 947         public function footerLink( $desc, $page ) {
 948                 // if the link description has been set to "-" in the default language,
 949                 if ( $this->msg( $desc )->inContentLanguage()->isDisabled() ) {
 950                         // then it is disabled, for all languages.
 951                         return '';
 952                 } else {
 953                         // Otherwise, we display the link for the user, described in their
 954                         // language (which may or may not be the same as the default language),
 955                         // but we make the link target be the one site-wide page.
 956                         $title = Title::newFromText( $this->msg( $page )->inContentLanguage()->text() );
 957
 958                         if ( !$title ) {
 959                                 return '';
 960                         }
 961
 962                         return Linker::linkKnown(
 963                                 $title,
 964                                 $this->msg( $desc )->escaped()
 965                         );
 966                 }
 967         }
 968
 969         /**
 970          * Gets the link to the wiki's privacy policy page.
 971          * @return string HTML
 972          */
 973         function privacyLink() {
 974                 return $this->footerLink( 'privacy', 'privacypage' );
 975         }
 976
 977         /**
 978          * Gets the link to the wiki's about page.
 979          * @return string HTML
 980          */
 981         function aboutLink() {
 982                 return $this->footerLink( 'aboutsite', 'aboutpage' );
 983         }
 984
 985         /**
 986          * Gets the link to the wiki's general disclaimers page.
 987          * @return string HTML
 988          */
 989         function disclaimerLink() {
 990                 return $this->footerLink( 'disclaimers', 'disclaimerpage' );
 991         }
 992
 993         /**
 994          * Return URL options for the 'edit page' link.
 995          * This may include an 'oldid' specifier, if the current page view is such.
 996          *
 997          * @return array
 998          * @private
 999          */
1000         function editUrlOptions() {
1001                 $options = [ 'action' => 'edit' ];
1002
1003                 if ( !$this->isRevisionCurrent() ) {
1004                         $options['oldid'] = intval( $this->getRevisionId() );
1005                 }
1006
1007                 return $options;
1008         }
1009
1010         /**
1011          * @param User|int $id
1012          * @return bool
1013          */
1014         function showEmailUser( $id ) {
1015                 if ( $id instanceof User ) {
1016                         $targetUser = $id;
1017                 } else {
1018                         $targetUser = User::newFromId( $id );
1019                 }
1020
1021                 # The sending user must have a confirmed email address and the target
1022                 # user must have a confirmed email address and allow emails from users.
1023                 return $this->getUser()->canSendEmail() &&
1024                         $targetUser->canReceiveEmail();
1025         }
1026
1027         /**
1028          * Return a fully resolved style path url to images or styles stored in the current skins's folder.
1029          * This method returns a url resolved using the configured skin style path
1030          * and includes the style version inside of the url.
1031          *
1032          * Requires $stylename to be set, otherwise throws MWException.
1033          *
1034          * @param string $name The name or path of a skin resource file
1035          * @return string The fully resolved style path url including styleversion
1036          * @throws MWException
1037          */
1038         function getSkinStylePath( $name ) {
1039                 global $wgStylePath, $wgStyleVersion;
1040
1041                 if ( $this->stylename === null ) {
1042                         $class = get_class( $this );
1043                         throw new MWException( "$class::\$stylename must be set to use getSkinStylePath()" );
1044                 }
1045
1046                 return "$wgStylePath/{$this->stylename}/$name?$wgStyleVersion";
1047         }
1048
1049         /* these are used extensively in SkinTemplate, but also some other places */
1050
1051         /**
1052          * @param string $urlaction
1053          * @return string
1054          */
1055         static function makeMainPageUrl( $urlaction = '' ) {
1056                 $title = Title::newMainPage();
1057                 self::checkTitle( $title, '' );
1058
1059                 return $title->getLocalURL( $urlaction );
1060         }
1061
1062         /**
1063          * Make a URL for a Special Page using the given query and protocol.
1064          *
1065          * If $proto is set to null, make a local URL. Otherwise, make a full
1066          * URL with the protocol specified.
1067          *
1068          * @param string $name Name of the Special page
1069          * @param string $urlaction Query to append
1070          * @param string|null $proto Protocol to use or null for a local URL
1071          * @return string
1072          */
1073         static function makeSpecialUrl( $name, $urlaction = '', $proto = null ) {
1074                 $title = SpecialPage::getSafeTitleFor( $name );
1075                 if ( is_null( $proto ) ) {
1076                         return $title->getLocalURL( $urlaction );
1077                 } else {
1078                         return $title->getFullURL( $urlaction, false, $proto );
1079                 }
1080         }
1081
1082         /**
1083          * @param string $name
1084          * @param string $subpage
1085          * @param string $urlaction
1086          * @return string
1087          */
1088         static function makeSpecialUrlSubpage( $name, $subpage, $urlaction = '' ) {
1089                 $title = SpecialPage::getSafeTitleFor( $name, $subpage );
1090                 return $title->getLocalURL( $urlaction );
1091         }
1092
1093         /**
1094          * @param string $name
1095          * @param string $urlaction
1096          * @return string
1097          */
1098         static function makeI18nUrl( $name, $urlaction = '' ) {
1099                 $title = Title::newFromText( wfMessage( $name )->inContentLanguage()->text() );
1100                 self::checkTitle( $title, $name );
1101                 return $title->getLocalURL( $urlaction );
1102         }
1103
1104         /**
1105          * @param string $name
1106          * @param string $urlaction
1107          * @return string
1108          */
1109         static function makeUrl( $name, $urlaction = '' ) {
1110                 $title = Title::newFromText( $name );
1111                 self::checkTitle( $title, $name );
1112
1113                 return $title->getLocalURL( $urlaction );
1114         }
1115
1116         /**
1117          * If url string starts with http, consider as external URL, else
1118          * internal
1119          * @param string $name
1120          * @return string URL
1121          */
1122         static function makeInternalOrExternalUrl( $name ) {
1123                 if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $name ) ) {
1124                         return $name;
1125                 } else {
1126                         return self::makeUrl( $name );
1127                 }
1128         }
1129
1130         /**
1131          * this can be passed the NS number as defined in Language.php
1132          * @param string $name
1133          * @param string $urlaction
1134          * @param int $namespace
1135          * @return string
1136          */
1137         static function makeNSUrl( $name, $urlaction = '', $namespace = NS_MAIN ) {
1138                 $title = Title::makeTitleSafe( $namespace, $name );
1139                 self::checkTitle( $title, $name );
1140
1141                 return $title->getLocalURL( $urlaction );
1142         }
1143
1144         /**
1145          * these return an array with the 'href' and boolean 'exists'
1146          * @param string $name
1147          * @param string $urlaction
1148          * @return array
1149          */
1150         static function makeUrlDetails( $name, $urlaction = '' ) {
1151                 $title = Title::newFromText( $name );
1152                 self::checkTitle( $title, $name );
1153
1154                 return [
1155                         'href' => $title->getLocalURL( $urlaction ),
1156                         'exists' => $title->isKnown(),
1157                 ];
1158         }
1159
1160         /**
1161          * Make URL details where the article exists (or at least it's convenient to think so)
1162          * @param string $name Article name
1163          * @param string $urlaction
1164          * @return array
1165          */
1166         static function makeKnownUrlDetails( $name, $urlaction = '' ) {
1167                 $title = Title::newFromText( $name );
1168                 self::checkTitle( $title, $name );
1169
1170                 return [
1171                         'href' => $title->getLocalURL( $urlaction ),
1172                         'exists' => true
1173                 ];
1174         }
1175
1176         /**
1177          * make sure we have some title to operate on
1178          *
1179          * @param Title $title
1180          * @param string $name
1181          */
1182         static function checkTitle( &$title, $name ) {
1183                 if ( !is_object( $title ) ) {
1184                         $title = Title::newFromText( $name );
1185                         if ( !is_object( $title ) ) {
1186                                 $title = Title::newFromText( '--error: link target missing--' );
1187                         }
1188                 }
1189         }
1190
1191         /**
1192          * Build an array that represents the sidebar(s), the navigation bar among them.
1193          *
1194          * BaseTemplate::getSidebar can be used to simplify the format and id generation in new skins.
1195          *
1196          * The format of the returned array is array( heading => content, ... ), where:
1197          * - heading is the heading of a navigation portlet. It is either:
1198          *   - magic string to be handled by the skins ('SEARCH' / 'LANGUAGES' / 'TOOLBOX' / ...)
1199          *   - a message name (e.g. 'navigation'), the message should be HTML-escaped by the skin
1200          *   - plain text, which should be HTML-escaped by the skin
1201          * - content is the contents of the portlet. It is either:
1202          *   - HTML text (<ul><li>...</li>...</ul>)
1203          *   - array of link data in a format accepted by BaseTemplate::makeListItem()
1204          *   - (for a magic string as a key, any value)
1205          *
1206          * Note that extensions can control the sidebar contents using the SkinBuildSidebar hook
1207          * and can technically insert anything in here; skin creators are expected to handle
1208          * values described above.
1209          *
1210          * @return array
1211          */
1212         function buildSidebar() {
1213                 global $wgEnableSidebarCache, $wgSidebarCacheExpiry;
1214
1215                 $that = $this;
1216                 $callback = function () use ( $that ) {
1217                         $bar = [];
1218                         $that->addToSidebar( $bar, 'sidebar' );
1219                         Hooks::run( 'SkinBuildSidebar', [ $that, &$bar ] );
1220
1221                         return $bar;
1222                 };
1223
1224                 if ( $wgEnableSidebarCache ) {
1225                         $cache = ObjectCache::getMainWANInstance();
1226                         $sidebar = $cache->getWithSetCallback(
1227                                 $cache->makeKey( 'sidebar', $this->getLanguage()->getCode() ),
1228                                 $wgSidebarCacheExpiry,
1229                                 $callback,
1230                                 [ 'lockTSE' => 30 ]
1231                         );
1232                 } else {
1233                         $sidebar = $callback();
1234                 }
1235
1236                 // Apply post-processing to the cached value
1237                 Hooks::run( 'SidebarBeforeOutput', [ $this, &$sidebar ] );
1238
1239                 return $sidebar;
1240         }
1241
1242         /**
1243          * Add content from a sidebar system message
1244          * Currently only used for MediaWiki:Sidebar (but may be used by Extensions)
1245          *
1246          * This is just a wrapper around addToSidebarPlain() for backwards compatibility
1247          *
1248          * @param array $bar
1249          * @param string $message
1250          */
1251         public function addToSidebar( &$bar, $message ) {
1252                 $this->addToSidebarPlain( $bar, wfMessage( $message )->inContentLanguage()->plain() );
1253         }
1254
1255         /**
1256          * Add content from plain text
1257          * @since 1.17
1258          * @param array $bar
1259          * @param string $text
1260          * @return array
1261          */
1262         function addToSidebarPlain( &$bar, $text ) {
1263                 $lines = explode( "\n", $text );
1264
1265                 $heading = '';
1266
1267                 foreach ( $lines as $line ) {
1268                         if ( strpos( $line, '*' ) !== 0 ) {
1269                                 continue;
1270                         }
1271                         $line = rtrim( $line, "\r" ); // for Windows compat
1272
1273                         if ( strpos( $line, '**' ) !== 0 ) {
1274                                 $heading = trim( $line, '* ' );
1275                                 if ( !array_key_exists( $heading, $bar ) ) {
1276                                         $bar[$heading] = [];
1277                                 }
1278                         } else {
1279                                 $line = trim( $line, '* ' );
1280
1281                                 if ( strpos( $line, '|' ) !== false ) { // sanity check
1282                                         $line = MessageCache::singleton()->transform( $line, false, null, $this->getTitle() );
1283                                         $line = array_map( 'trim', explode( '|', $line, 2 ) );
1284                                         if ( count( $line ) !== 2 ) {
1285                                                 // Second sanity check, could be hit by people doing
1286                                                 // funky stuff with parserfuncs... (bug 33321)
1287                                                 continue;
1288                                         }
1289
1290                                         $extraAttribs = [];
1291
1292                                         $msgLink = $this->msg( $line[0] )->inContentLanguage();
1293                                         if ( $msgLink->exists() ) {
1294                                                 $link = $msgLink->text();
1295                                                 if ( $link == '-' ) {
1296                                                         continue;
1297                                                 }
1298                                         } else {
1299                                                 $link = $line[0];
1300                                         }
1301                                         $msgText = $this->msg( $line[1] );
1302                                         if ( $msgText->exists() ) {
1303                                                 $text = $msgText->text();
1304                                         } else {
1305                                                 $text = $line[1];
1306                                         }
1307
1308                                         if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $link ) ) {
1309                                                 $href = $link;
1310
1311                                                 // Parser::getExternalLinkAttribs won't work here because of the Namespace things
1312                                                 global $wgNoFollowLinks, $wgNoFollowDomainExceptions;
1313                                                 if ( $wgNoFollowLinks && !wfMatchesDomainList( $href, $wgNoFollowDomainExceptions ) ) {
1314                                                         $extraAttribs['rel'] = 'nofollow';
1315                                                 }
1316
1317                                                 global $wgExternalLinkTarget;
1318                                                 if ( $wgExternalLinkTarget ) {
1319                                                         $extraAttribs['target'] = $wgExternalLinkTarget;
1320                                                 }
1321                                         } else {
1322                                                 $title = Title::newFromText( $link );
1323
1324                                                 if ( $title ) {
1325                                                         $title = $title->fixSpecialName();
1326                                                         $href = $title->getLinkURL();
1327                                                 } else {
1328                                                         $href = 'INVALID-TITLE';
1329                                                 }
1330                                         }
1331
1332                                         $bar[$heading][] = array_merge( [
1333                                                 'text' => $text,
1334                                                 'href' => $href,
1335                                                 'id' => 'n-' . Sanitizer::escapeId( strtr( $line[1], ' ', '-' ), 'noninitial' ),
1336                                                 'active' => false
1337                                         ], $extraAttribs );
1338                                 } else {
1339                                         continue;
1340                                 }
1341                         }
1342                 }
1343
1344                 return $bar;
1345         }
1346
1347         /**
1348          * Gets new talk page messages for the current user and returns an
1349          * appropriate alert message (or an empty string if there are no messages)
1350          * @return string
1351          */
1352         function getNewtalks() {
1353
1354                 $newMessagesAlert = '';
1355                 $user = $this->getUser();
1356                 $newtalks = $user->getNewMessageLinks();
1357                 $out = $this->getOutput();
1358
1359                 // Allow extensions to disable or modify the new messages alert
1360                 if ( !Hooks::run( 'GetNewMessagesAlert', [ &$newMessagesAlert, $newtalks, $user, $out ] ) ) {
1361                         return '';
1362                 }
1363                 if ( $newMessagesAlert ) {
1364                         return $newMessagesAlert;
1365                 }
1366
1367                 if ( count( $newtalks ) == 1 && $newtalks[0]['wiki'] === wfWikiID() ) {
1368                         $uTalkTitle = $user->getTalkPage();
1369                         $lastSeenRev = isset( $newtalks[0]['rev'] ) ? $newtalks[0]['rev'] : null;
1370                         $nofAuthors = 0;
1371                         if ( $lastSeenRev !== null ) {
1372                                 $plural = true; // Default if we have a last seen revision: if unknown, use plural
1373                                 $latestRev = Revision::newFromTitle( $uTalkTitle, false, Revision::READ_NORMAL );
1374                                 if ( $latestRev !== null ) {
1375                                         // Singular if only 1 unseen revision, plural if several unseen revisions.
1376                                         $plural = $latestRev->getParentId() !== $lastSeenRev->getId();
1377                                         $nofAuthors = $uTalkTitle->countAuthorsBetween(
1378                                                 $lastSeenRev, $latestRev, 10, 'include_new' );
1379                                 }
1380                         } else {
1381                                 // Singular if no revision -> diff link will show latest change only in any case
1382                                 $plural = false;
1383                         }
1384                         $plural = $plural ? 999 : 1;
1385                         // 999 signifies "more than one revision". We don't know how many, and even if we did,
1386                         // the number of revisions or authors is not necessarily the same as the number of
1387                         // "messages".
1388                         $newMessagesLink = Linker::linkKnown(
1389                                 $uTalkTitle,
1390                                 $this->msg( 'newmessageslinkplural' )->params( $plural )->escaped(),
1391                                 [],
1392                                 [ 'redirect' => 'no' ]
1393                         );
1394
1395                         $newMessagesDiffLink = Linker::linkKnown(
1396                                 $uTalkTitle,
1397                                 $this->msg( 'newmessagesdifflinkplural' )->params( $plural )->escaped(),
1398                                 [],
1399                                 $lastSeenRev !== null
1400                                         ? [ 'oldid' => $lastSeenRev->getId(), 'diff' => 'cur' ]
1401                                         : [ 'diff' => 'cur' ]
1402                         );
1403
1404                         if ( $nofAuthors >= 1 && $nofAuthors <= 10 ) {
1405                                 $newMessagesAlert = $this->msg(
1406                                         'youhavenewmessagesfromusers',
1407                                         $newMessagesLink,
1408                                         $newMessagesDiffLink
1409                                 )->numParams( $nofAuthors, $plural );
1410                         } else {
1411                                 // $nofAuthors === 11 signifies "11 or more" ("more than 10")
1412                                 $newMessagesAlert = $this->msg(
1413                                         $nofAuthors > 10 ? 'youhavenewmessagesmanyusers' : 'youhavenewmessages',
1414                                         $newMessagesLink,
1415                                         $newMessagesDiffLink
1416                                 )->numParams( $plural );
1417                         }
1418                         $newMessagesAlert = $newMessagesAlert->text();
1419                         # Disable CDN cache
1420                         $out->setCdnMaxage( 0 );
1421                 } elseif ( count( $newtalks ) ) {
1422                         $sep = $this->msg( 'newtalkseparator' )->escaped();
1423                         $msgs = [];
1424
1425                         foreach ( $newtalks as $newtalk ) {
1426                                 $msgs[] = Xml::element(
1427                                         'a',
1428                                         [ 'href' => $newtalk['link'] ], $newtalk['wiki']
1429                                 );
1430                         }
1431                         $parts = implode( $sep, $msgs );
1432                         $newMessagesAlert = $this->msg( 'youhavenewmessagesmulti' )->rawParams( $parts )->escaped();
1433                         $out->setCdnMaxage( 0 );
1434                 }
1435
1436                 return $newMessagesAlert;
1437         }
1438
1439         /**
1440          * Get a cached notice
1441          *
1442          * @param string $name Message name, or 'default' for $wgSiteNotice
1443          * @return string|bool HTML fragment, or false to indicate that the caller
1444          *   should fall back to the next notice in its sequence
1445          */
1446         private function getCachedNotice( $name ) {
1447                 global $wgRenderHashAppend, $parserMemc, $wgContLang;
1448
1449                 $needParse = false;
1450
1451                 if ( $name === 'default' ) {
1452                         // special case
1453                         global $wgSiteNotice;
1454                         $notice = $wgSiteNotice;
1455                         if ( empty( $notice ) ) {
1456                                 return false;
1457                         }
1458                 } else {
1459                         $msg = $this->msg( $name )->inContentLanguage();
1460                         if ( $msg->isBlank() ) {
1461                                 return '';
1462                         } elseif ( $msg->isDisabled() ) {
1463                                 return false;
1464                         }
1465                         $notice = $msg->plain();
1466                 }
1467
1468                 // Use the extra hash appender to let eg SSL variants separately cache.
1469                 $key = wfMemcKey( $name . $wgRenderHashAppend );
1470                 $cachedNotice = $parserMemc->get( $key );
1471                 if ( is_array( $cachedNotice ) ) {
1472                         if ( md5( $notice ) == $cachedNotice['hash'] ) {
1473                                 $notice = $cachedNotice['html'];
1474                         } else {
1475                                 $needParse = true;
1476                         }
1477                 } else {
1478                         $needParse = true;
1479                 }
1480
1481                 if ( $needParse ) {
1482                         $parsed = $this->getOutput()->parse( $notice );
1483                         $parserMemc->set( $key, [ 'html' => $parsed, 'hash' => md5( $notice ) ], 600 );
1484                         $notice = $parsed;
1485                 }
1486
1487                 $notice = Html::rawElement( 'div', [ 'id' => 'localNotice',
1488                         'lang' => $wgContLang->getHtmlCode(), 'dir' => $wgContLang->getDir() ], $notice );
1489                 return $notice;
1490         }
1491
1492         /**
1493          * Get the site notice
1494          *
1495          * @return string HTML fragment
1496          */
1497         function getSiteNotice() {
1498                 $siteNotice = '';
1499
1500                 if ( Hooks::run( 'SiteNoticeBefore', [ &$siteNotice, $this ] ) ) {
1501                         if ( is_object( $this->getUser() ) && $this->getUser()->isLoggedIn() ) {
1502                                 $siteNotice = $this->getCachedNotice( 'sitenotice' );
1503                         } else {
1504                                 $anonNotice = $this->getCachedNotice( 'anonnotice' );
1505                                 if ( $anonNotice === false ) {
1506                                         $siteNotice = $this->getCachedNotice( 'sitenotice' );
1507                                 } else {
1508                                         $siteNotice = $anonNotice;
1509                                 }
1510                         }
1511                         if ( $siteNotice === false ) {
1512                                 $siteNotice = $this->getCachedNotice( 'default' );
1513                         }
1514                 }
1515
1516                 Hooks::run( 'SiteNoticeAfter', [ &$siteNotice, $this ] );
1517                 return $siteNotice;
1518         }
1519
1520         /**
1521          * Create a section edit link.  This supersedes editSectionLink() and
1522          * editSectionLinkForOther().
1523          *
1524          * @param Title $nt The title being linked to (may not be the same as
1525          *   the current page, if the section is included from a template)
1526          * @param string $section The designation of the section being pointed to,
1527          *   to be included in the link, like "&section=$section"
1528          * @param string $tooltip The tooltip to use for the link: will be escaped
1529          *   and wrapped in the 'editsectionhint' message
1530          * @param string $lang Language code
1531          * @return string HTML to use for edit link
1532          */
1533         public function doEditSectionLink( Title $nt, $section, $tooltip = null, $lang = false ) {
1534                 // HTML generated here should probably have userlangattributes
1535                 // added to it for LTR text on RTL pages
1536
1537                 $lang = wfGetLangObj( $lang );
1538
1539                 $attribs = [];
1540                 if ( !is_null( $tooltip ) ) {
1541                         # Bug 25462: undo double-escaping.
1542                         $tooltip = Sanitizer::decodeCharReferences( $tooltip );
1543                         $attribs['title'] = wfMessage( 'editsectionhint' )->rawParams( $tooltip )
1544                                 ->inLanguage( $lang )->text();
1545                 }
1546
1547                 $links = [
1548                         'editsection' => [
1549                                 'text' => wfMessage( 'editsection' )->inLanguage( $lang )->escaped(),
1550                                 'targetTitle' => $nt,
1551                                 'attribs' => $attribs,
1552                                 'query' => [ 'action' => 'edit', 'section' => $section ],
1553                                 'options' => [ 'noclasses', 'known' ]
1554                         ]
1555                 ];
1556
1557                 Hooks::run( 'SkinEditSectionLinks', [ $this, $nt, $section, $tooltip, &$links, $lang ] );
1558
1559                 $result = '<span class="mw-editsection"><span class="mw-editsection-bracket">[</span>';
1560
1561                 $linksHtml = [];
1562                 foreach ( $links as $k => $linkDetails ) {
1563                         $linksHtml[] = Linker::link(
1564                                 $linkDetails['targetTitle'],
1565                                 $linkDetails['text'],
1566                                 $linkDetails['attribs'],
1567                                 $linkDetails['query'],
1568                                 $linkDetails['options']
1569                         );
1570                 }
1571
1572                 $result .= implode(
1573                         '<span class="mw-editsection-divider">'
1574                                 . wfMessage( 'pipe-separator' )->inLanguage( $lang )->text()
1575                                 . '</span>',
1576                         $linksHtml
1577                 );
1578
1579                 $result .= '<span class="mw-editsection-bracket">]</span></span>';
1580                 // Deprecated, use SkinEditSectionLinks hook instead
1581                 Hooks::run(
1582                         'DoEditSectionLink',
1583                         [ $this, $nt, $section, $tooltip, &$result, $lang ],
1584                         '1.25'
1585                 );
1586                 return $result;
1587         }
1588
1589         /**
1590          * Use PHP's magic __call handler to intercept legacy calls to the linker
1591          * for backwards compatibility.
1592          *
1593          * @param string $fname Name of called method
1594          * @param array $args Arguments to the method
1595          * @throws MWException
1596          * @return mixed
1597          */
1598         function __call( $fname, $args ) {
1599                 $realFunction = [ 'Linker', $fname ];
1600                 if ( is_callable( $realFunction ) ) {
1601                         wfDeprecated( get_class( $this ) . '::' . $fname, '1.21' );
1602                         return call_user_func_array( $realFunction, $args );
1603                 } else {
1604                         $className = get_class( $this );
1605                         throw new MWException( "Call to undefined method $className::$fname" );
1606                 }
1607         }
1608
1609 }