SpecialPageFactory.php

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<?php
use MediaWiki\Linker\LinkRenderer;

class SpecialPageFactory {
    private static $coreList = [
        // Maintenance Reports
        'BrokenRedirects' => 'BrokenRedirectsPage',
        'Deadendpages' => 'DeadendPagesPage',
        'DoubleRedirects' => 'DoubleRedirectsPage',
        'Longpages' => 'LongPagesPage',
        'Ancientpages' => 'AncientPagesPage',
        'Lonelypages' => 'LonelyPagesPage',
        'Fewestrevisions' => 'FewestrevisionsPage',
        'Withoutinterwiki' => 'WithoutInterwikiPage',
        'Protectedpages' => 'SpecialProtectedpages',
        'Protectedtitles' => 'SpecialProtectedtitles',
        'Shortpages' => 'ShortPagesPage',
        'Uncategorizedcategories' => 'UncategorizedCategoriesPage',
        'Uncategorizedimages' => 'UncategorizedImagesPage',
        'Uncategorizedpages' => 'UncategorizedPagesPage',
        'Uncategorizedtemplates' => 'UncategorizedTemplatesPage',
        'Unusedcategories' => 'UnusedCategoriesPage',
        'Unusedimages' => 'UnusedimagesPage',
        'Unusedtemplates' => 'UnusedtemplatesPage',
        'Unwatchedpages' => 'UnwatchedpagesPage',
        'Wantedcategories' => 'WantedCategoriesPage',
        'Wantedfiles' => 'WantedFilesPage',
        'Wantedpages' => 'WantedPagesPage',
        'Wantedtemplates' => 'WantedTemplatesPage',

        // List of pages
        'Allpages' => 'SpecialAllPages',
        'Prefixindex' => 'SpecialPrefixindex',
        'Categories' => 'SpecialCategories',
        'Listredirects' => 'ListredirectsPage',
        'PagesWithProp' => 'SpecialPagesWithProp',
        'TrackingCategories' => 'SpecialTrackingCategories',

        // Authentication
        'Userlogin' => 'SpecialUserLogin',
        'Userlogout' => 'SpecialUserlogoutPreAuthManager',
        'CreateAccount' => 'SpecialCreateAccountPreAuthManager',
        'LinkAccounts' => 'SpecialLinkAccounts',
        'UnlinkAccounts' => 'SpecialUnlinkAccounts',
        'ChangeCredentials' => 'SpecialChangeCredentials',
        'RemoveCredentials' => 'SpecialRemoveCredentials',

        // Users and rights
        'Activeusers' => 'SpecialActiveUsers',
        'Block' => 'SpecialBlock',
        'Unblock' => 'SpecialUnblock',
        'BlockList' => 'SpecialBlockList',
        'ChangePassword' => 'SpecialChangePasswordPreAuthManager',
        'BotPasswords' => 'SpecialBotPasswords',
        'PasswordReset' => 'SpecialPasswordResetPreAuthManager',
        'DeletedContributions' => 'DeletedContributionsPage',
        'Preferences' => 'SpecialPreferences',
        'ResetTokens' => 'SpecialResetTokens',
        'Contributions' => 'SpecialContributions',
        'Listgrouprights' => 'SpecialListGroupRights',
        'Listgrants' => 'SpecialListGrants',
        'Listusers' => 'SpecialListUsers',
        'Listadmins' => 'SpecialListAdmins',
        'Listbots' => 'SpecialListBots',
        'Userrights' => 'UserrightsPage',
        'EditWatchlist' => 'SpecialEditWatchlist',

        // Recent changes and logs
        'Newimages' => 'SpecialNewFiles',
        'Log' => 'SpecialLog',
        'Watchlist' => 'SpecialWatchlist',
        'Newpages' => 'SpecialNewpages',
        'Recentchanges' => 'SpecialRecentChanges',
        'Recentchangeslinked' => 'SpecialRecentChangesLinked',
        'Tags' => 'SpecialTags',

        // Media reports and uploads
        'Listfiles' => 'SpecialListFiles',
        'Filepath' => 'SpecialFilepath',
        'MediaStatistics' => 'MediaStatisticsPage',
        'MIMEsearch' => 'MIMEsearchPage',
        'FileDuplicateSearch' => 'FileDuplicateSearchPage',
        'Upload' => 'SpecialUpload',
        'UploadStash' => 'SpecialUploadStash',
        'ListDuplicatedFiles' => 'ListDuplicatedFilesPage',

        // Data and tools
        'ApiSandbox' => 'SpecialApiSandbox',
        'Statistics' => 'SpecialStatistics',
        'Allmessages' => 'SpecialAllMessages',
        'Version' => 'SpecialVersion',
        'Lockdb' => 'SpecialLockdb',
        'Unlockdb' => 'SpecialUnlockdb',

        // Redirecting special pages
        'LinkSearch' => 'LinkSearchPage',
        'Randompage' => 'RandomPage',
        'RandomInCategory' => 'SpecialRandomInCategory',
        'Randomredirect' => 'SpecialRandomredirect',
        'Randomrootpage' => 'SpecialRandomrootpage',

        // High use pages
        'Mostlinkedcategories' => 'MostlinkedCategoriesPage',
        'Mostimages' => 'MostimagesPage',
        'Mostinterwikis' => 'MostinterwikisPage',
        'Mostlinked' => 'MostlinkedPage',
        'Mostlinkedtemplates' => 'MostlinkedTemplatesPage',
        'Mostcategories' => 'MostcategoriesPage',
        'Mostrevisions' => 'MostrevisionsPage',

        // Page tools
        'ComparePages' => 'SpecialComparePages',
        'Export' => 'SpecialExport',
        'Import' => 'SpecialImport',
        'Undelete' => 'SpecialUndelete',
        'Whatlinkshere' => 'SpecialWhatLinksHere',
        'MergeHistory' => 'SpecialMergeHistory',
        'ExpandTemplates' => 'SpecialExpandTemplates',

        // Other
        'Booksources' => 'SpecialBookSources',

        // Unlisted / redirects
        'ApiHelp' => 'SpecialApiHelp',
        'Blankpage' => 'SpecialBlankpage',
        'Diff' => 'SpecialDiff',
        'EditTags' => 'SpecialEditTags',
        'Emailuser' => 'SpecialEmailUser',
        'Movepage' => 'MovePageForm',
        'Mycontributions' => 'SpecialMycontributions',
        'MyLanguage' => 'SpecialMyLanguage',
        'Mypage' => 'SpecialMypage',
        'Mytalk' => 'SpecialMytalk',
        'Myuploads' => 'SpecialMyuploads',
        'AllMyUploads' => 'SpecialAllMyUploads',
        'PermanentLink' => 'SpecialPermanentLink',
        'Redirect' => 'SpecialRedirect',
        'Revisiondelete' => 'SpecialRevisionDelete',
        'RunJobs' => 'SpecialRunJobs',
        'Specialpages' => 'SpecialSpecialpages',
    ];

    private static $list;
    private static $aliases;
    private static $pageObjectCache = [];

    public static function resetList() {
        self::$list = null;
        self::$aliases = null;
        self::$pageObjectCache = [];
    }

    public static function getNames() {
        return array_keys( self::getPageList() );
    }

    public static function getList() {
        wfDeprecated( __FUNCTION__, '1.24' );
        return self::getPageList();
    }

    private static function getPageList() {
        global $wgSpecialPages;
        global $wgDisableInternalSearch, $wgEmailAuthentication;
        global $wgEnableEmail, $wgEnableJavaScriptTest;
        global $wgPageLanguageUseDB, $wgContentHandlerUseDB;
        global $wgDisableAuthManager;

        if ( !is_array( self::$list ) ) {

            self::$list = self::$coreList;

            if ( !$wgDisableInternalSearch ) {
                self::$list['Search'] = 'SpecialSearch';
            }

            if ( $wgEmailAuthentication ) {
                self::$list['Confirmemail'] = 'EmailConfirmation';
                self::$list['Invalidateemail'] = 'EmailInvalidation';
            }

            if ( $wgEnableEmail ) {
                self::$list['ChangeEmail'] = 'SpecialChangeEmailPreAuthManager';
            }

            if ( $wgEnableJavaScriptTest ) {
                self::$list['JavaScriptTest'] = 'SpecialJavaScriptTest';
            }

            if ( $wgPageLanguageUseDB ) {
                self::$list['PageLanguage'] = 'SpecialPageLanguage';
            }
            if ( $wgContentHandlerUseDB ) {
                self::$list['ChangeContentModel'] = 'SpecialChangeContentModel';
            }

            // horrible hack to allow selection between old and new classes via a feature flag - T110756
            // will be removed once AuthManager is stable
            if ( !$wgDisableAuthManager ) {
                self::$list = array_map( function ( $class ) {
                    return preg_replace( '/PreAuthManager$/', '', $class );
                }, self::$list );
                self::$list['Userlogout'] = 'SpecialUserLogout'; // case matters
            } else {
                self::$list['Userlogin'] = 'LoginForm';
                self::$list = array_diff_key( self::$list, array_fill_keys( [
                    'LinkAccounts', 'UnlinkAccounts', 'ChangeCredentials', 'RemoveCredentials',
                ], true ) );
            }

            // Add extension special pages
            self::$list = array_merge( self::$list, $wgSpecialPages );

            // This hook can be used to disable unwanted core special pages
            // or conditionally register special pages.
            Hooks::run( 'SpecialPage_initList', [ &self::$list ] );

        }

        return self::$list;
    }

    private static function getAliasList() {
        if ( is_null( self::$aliases ) ) {
            global $wgContLang;
            $aliases = $wgContLang->getSpecialPageAliases();
            $pageList = self::getPageList();

            self::$aliases = [];
            $keepAlias = [];

            // Force every canonical name to be an alias for itself.
            foreach ( $pageList as $name => $stuff ) {
                $caseFoldedAlias = $wgContLang->caseFold( $name );
                self::$aliases[$caseFoldedAlias] = $name;
                $keepAlias[$caseFoldedAlias] = 'canonical';
            }

            // Check for $aliases being an array since Language::getSpecialPageAliases can return null
            if ( is_array( $aliases ) ) {
                foreach ( $aliases as $realName => $aliasList ) {
                    $aliasList = array_values( $aliasList );
                    foreach ( $aliasList as $i => $alias ) {
                        $caseFoldedAlias = $wgContLang->caseFold( $alias );

                        if ( isset( self::$aliases[$caseFoldedAlias] ) &&
                            $realName === self::$aliases[$caseFoldedAlias]
                        ) {
                            // Ignore same-realName conflicts
                            continue;
                        }

                        if ( !isset( $keepAlias[$caseFoldedAlias] ) ) {
                            self::$aliases[$caseFoldedAlias] = $realName;
                            if ( !$i ) {
                                $keepAlias[$caseFoldedAlias] = 'first';
                            }
                        } elseif ( !$i ) {
                            wfWarn( "First alias '$alias' for $realName conflicts with " .
                                "{$keepAlias[$caseFoldedAlias]} alias for " .
                                self::$aliases[$caseFoldedAlias]
                            );
                        }
                    }
                }
            }
        }

        return self::$aliases;
    }

    public static function resolveAlias( $alias ) {
        global $wgContLang;
        $bits = explode( '/', $alias, 2 );

        $caseFoldedAlias = $wgContLang->caseFold( $bits[0] );
        $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
        $aliases = self::getAliasList();
        if ( isset( $aliases[$caseFoldedAlias] ) ) {
            $name = $aliases[$caseFoldedAlias];
        } else {
            return [ null, null ];
        }

        if ( !isset( $bits[1] ) ) { // bug 2087
            $par = null;
        } else {
            $par = $bits[1];
        }

        return [ $name, $par ];
    }

    public static function exists( $name ) {
        list( $title, /*...*/ ) = self::resolveAlias( $name );

        $specialPageList = self::getPageList();
        return isset( $specialPageList[$title] );
    }

    public static function getPage( $name ) {
        list( $realName, /*...*/ ) = self::resolveAlias( $name );

        if ( isset( self::$pageObjectCache[$realName] ) ) {
            return self::$pageObjectCache[$realName];
        }

        $specialPageList = self::getPageList();

        if ( isset( $specialPageList[$realName] ) ) {
            $rec = $specialPageList[$realName];

            if ( is_callable( $rec ) ) {
                // Use callback to instantiate the special page
                $page = call_user_func( $rec );
            } elseif ( is_string( $rec ) ) {
                $className = $rec;
                $page = new $className;
            } elseif ( is_array( $rec ) ) {
                $className = array_shift( $rec );
                // @deprecated, officially since 1.18, unofficially since forever
                wfDeprecated( "Array syntax for \$wgSpecialPages is deprecated ($className), " .
                    "define a subclass of SpecialPage instead.", '1.18' );
                $page = ObjectFactory::getObjectFromSpec( [
                    'class' => $className,
                    'args' => $rec,
                    'closure_expansion' => false,
                ] );
            } elseif ( $rec instanceof SpecialPage ) {
                $page = $rec; // XXX: we should deep clone here
            } else {
                $page = null;
            }

            self::$pageObjectCache[$realName] = $page;
            if ( $page instanceof SpecialPage ) {
                return $page;
            } else {
                // It's not a classname, nor a callback, nor a legacy constructor array,
                // nor a special page object. Give up.
                wfLogWarning( "Cannot instantiate special page $realName: bad spec!" );
                return null;
            }

        } else {
            return null;
        }
    }

    public static function getUsablePages( User $user = null ) {
        $pages = [];
        if ( $user === null ) {
            global $wgUser;
            $user = $wgUser;
        }
        foreach ( self::getPageList() as $name => $rec ) {
            $page = self::getPage( $name );
            if ( $page ) { // not null
                $page->setContext( RequestContext::getMain() );
                if ( $page->isListed()
                    && ( !$page->isRestricted() || $page->userCanExecute( $user ) )
                ) {
                    $pages[$name] = $page;
                }
            }
        }

        return $pages;
    }

    public static function getRegularPages() {
        $pages = [];
        foreach ( self::getPageList() as $name => $rec ) {
            $page = self::getPage( $name );
            if ( $page->isListed() && !$page->isRestricted() ) {
                $pages[$name] = $page;
            }
        }

        return $pages;
    }

    public static function getRestrictedPages( User $user = null ) {
        $pages = [];
        if ( $user === null ) {
            global $wgUser;
            $user = $wgUser;
        }
        foreach ( self::getPageList() as $name => $rec ) {
            $page = self::getPage( $name );
            if (
                $page->isListed()
                && $page->isRestricted()
                && $page->userCanExecute( $user )
            ) {
                $pages[$name] = $page;
            }
        }

        return $pages;
    }

    public static function executePath( Title &$title, IContextSource &$context, $including = false,
        LinkRenderer $linkRenderer = null
    ) {
        // @todo FIXME: Redirects broken due to this call
        $bits = explode( '/', $title->getDBkey(), 2 );
        $name = $bits[0];
        if ( !isset( $bits[1] ) ) { // bug 2087
            $par = null;
        } else {
            $par = $bits[1];
        }

        $page = self::getPage( $name );
        if ( !$page ) {
            $context->getOutput()->setArticleRelated( false );
            $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );

            global $wgSend404Code;
            if ( $wgSend404Code ) {
                $context->getOutput()->setStatusCode( 404 );
            }

            $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );

            return false;
        }

        if ( !$including ) {
            // Narrow DB query expectations for this HTTP request
            $trxLimits = $context->getConfig()->get( 'TrxProfilerLimits' );
            $trxProfiler = Profiler::instance()->getTransactionProfiler();
            if ( $context->getRequest()->wasPosted() && !$page->doesWrites() ) {
                $trxProfiler->setExpectations( $trxLimits['POST-nonwrite'], __METHOD__ );
                $context->getRequest()->markAsSafeRequest();
            }
        }

        // Page exists, set the context
        $page->setContext( $context );

        if ( !$including ) {
            // Redirect to canonical alias for GET commands
            // Not for POST, we'd lose the post data, so it's best to just distribute
            // the request. Such POST requests are possible for old extensions that
            // generate self-links without being aware that their default name has
            // changed.
            if ( $name != $page->getLocalName() && !$context->getRequest()->wasPosted() ) {
                $query = $context->getRequest()->getQueryValues();
                unset( $query['title'] );
                $title = $page->getPageTitle( $par );
                $url = $title->getFullURL( $query );
                $context->getOutput()->redirect( $url );

                return $title;
            } else {
                $context->setTitle( $page->getPageTitle( $par ) );
            }
        } elseif ( !$page->isIncludable() ) {
            return false;
        }

        $page->including( $including );
        if ( $linkRenderer ) {
            $page->setLinkRenderer( $linkRenderer );
        }

        // Execute special page
        $page->run( $par );

        return true;
    }

    public static function capturePath(
        Title $title, IContextSource $context, LinkRenderer $linkRenderer = null
    ) {
        global $wgTitle, $wgOut, $wgRequest, $wgUser, $wgLang;
        $main = RequestContext::getMain();

        // Save current globals and main context
        $glob = [
            'title' => $wgTitle,
            'output' => $wgOut,
            'request' => $wgRequest,
            'user' => $wgUser,
            'language' => $wgLang,
        ];
        $ctx = [
            'title' => $main->getTitle(),
            'output' => $main->getOutput(),
            'request' => $main->getRequest(),
            'user' => $main->getUser(),
            'language' => $main->getLanguage(),
        ];

        // Override
        $wgTitle = $title;
        $wgOut = $context->getOutput();
        $wgRequest = $context->getRequest();
        $wgUser = $context->getUser();
        $wgLang = $context->getLanguage();
        $main->setTitle( $title );
        $main->setOutput( $context->getOutput() );
        $main->setRequest( $context->getRequest() );
        $main->setUser( $context->getUser() );
        $main->setLanguage( $context->getLanguage() );

        // The useful part
        $ret = self::executePath( $title, $context, true, $linkRenderer );

        // Restore old globals and context
        $wgTitle = $glob['title'];
        $wgOut = $glob['output'];
        $wgRequest = $glob['request'];
        $wgUser = $glob['user'];
        $wgLang = $glob['language'];
        $main->setTitle( $ctx['title'] );
        $main->setOutput( $ctx['output'] );
        $main->setRequest( $ctx['request'] );
        $main->setUser( $ctx['user'] );
        $main->setLanguage( $ctx['language'] );

        return $ret;
    }

    public static function getLocalNameFor( $name, $subpage = false ) {
        global $wgContLang;
        $aliases = $wgContLang->getSpecialPageAliases();
        $aliasList = self::getAliasList();

        // Find the first alias that maps back to $name
        if ( isset( $aliases[$name] ) ) {
            $found = false;
            foreach ( $aliases[$name] as $alias ) {
                $caseFoldedAlias = $wgContLang->caseFold( $alias );
                $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
                if ( isset( $aliasList[$caseFoldedAlias] ) &&
                    $aliasList[$caseFoldedAlias] === $name
                ) {
                    $name = $alias;
                    $found = true;
                    break;
                }
            }
            if ( !$found ) {
                wfWarn( "Did not find a usable alias for special page '$name'. " .
                    "It seems all defined aliases conflict?" );
            }
        } else {
            // Check if someone misspelled the correct casing
            if ( is_array( $aliases ) ) {
                foreach ( $aliases as $n => $values ) {
                    if ( strcasecmp( $name, $n ) === 0 ) {
                        wfWarn( "Found alias defined for $n when searching for " .
                            "special page aliases for $name. Case mismatch?" );
                        return self::getLocalNameFor( $n, $subpage );
                    }
                }
            }

            wfWarn( "Did not find alias for special page '$name'. " .
                "Perhaps no aliases are defined for it?" );
        }

        if ( $subpage !== false && !is_null( $subpage ) ) {
            $name = "$name/$subpage";
        }

        return $wgContLang->ucfirst( $name );
    }

    public static function getTitleForAlias( $alias ) {
        list( $name, $subpage ) = self::resolveAlias( $alias );
        if ( $name != null ) {
            return SpecialPage::getTitleFor( $name, $subpage );
        } else {
            return null;
        }
    }
}