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[mediawiki.git] / includes / SpecialPageFactory.php

<?php
/**
 * Factory for handling the special page list and generating SpecialPage objects.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup SpecialPage
 * @defgroup SpecialPage SpecialPage
 */

/**
 * Factory for handling the special page list and generating SpecialPage objects.
 *
 * To add a special page in an extension, add to $wgSpecialPages either
 * an object instance or an array containing the name and constructor
 * parameters. The latter is preferred for performance reasons.
 *
 * The object instantiated must be either an instance of SpecialPage or a
 * sub-class thereof. It must have an execute() method, which sends the HTML
 * for the special page to $wgOut. The parent class has an execute() method
 * which distributes the call to the historical global functions. Additionally,
 * execute() also checks if the user has the necessary access privileges
 * and bails out if not.
 *
 * To add a core special page, use the similar static list in
 * SpecialPage::$mList. To remove a core static special page at runtime, use
 * a SpecialPage_initList hook.
 *
 * @ingroup SpecialPage
 * @since 1.17
 */
class SpecialPageFactory {

        /**
         * List of special page names to the subclass of SpecialPage which handles them.
         */
        private static $mList = array(
                // 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',
                'Disambiguations'           => 'DisambiguationsPage',
                'Listredirects'             => 'ListredirectsPage',
                'PagesWithProp'             => 'SpecialPagesWithProp',

                // Login/create account
                'Userlogin'                 => 'LoginForm',
                'CreateAccount'             => 'SpecialCreateAccount',

                // Users and rights
                'Block'                     => 'SpecialBlock',
                'Unblock'                   => 'SpecialUnblock',
                'BlockList'                 => 'SpecialBlockList',
                'ChangePassword'            => 'SpecialChangePassword',
                'PasswordReset'             => 'SpecialPasswordReset',
                'DeletedContributions'      => 'DeletedContributionsPage',
                'Preferences'               => 'SpecialPreferences',
                'Contributions'             => 'SpecialContributions',
                'Listgrouprights'           => 'SpecialListGroupRights',
                'Listusers'                 => 'SpecialListUsers',
                'Listadmins'                => 'SpecialListAdmins',
                'Listbots'                  => 'SpecialListBots',
                'Activeusers'               => 'SpecialActiveUsers',
                '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',
                'MIMEsearch'                => 'MIMEsearchPage',
                'FileDuplicateSearch'       => 'FileDuplicateSearchPage',
                'Upload'                    => 'SpecialUpload',
                'UploadStash'               => 'SpecialUploadStash',

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

                // Redirecting special pages
                'LinkSearch'                => 'LinkSearchPage',
                'Randompage'                => 'Randompage',
                'Randomredirect'            => 'SpecialRandomredirect',

                // 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',

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

                // Unlisted / redirects
                'Blankpage'                 => 'SpecialBlankpage',
                'Blockme'                   => 'SpecialBlockme',
                'Emailuser'                 => 'SpecialEmailUser',
                'Movepage'                  => 'MovePageForm',
                'Mycontributions'           => 'SpecialMycontributions',
                'Mypage'                    => 'SpecialMypage',
                'Mytalk'                    => 'SpecialMytalk',
                'Myuploads'                 => 'SpecialMyuploads',
                'PermanentLink'             => 'SpecialPermanentLink',
                'Redirect'                  => 'SpecialRedirect',
                'Revisiondelete'            => 'SpecialRevisionDelete',
                'Specialpages'              => 'SpecialSpecialpages',
                'Userlogout'                => 'SpecialUserlogout',
        );

        private static $mAliases;

        /**
         * Initialise the special page list
         * This must be called before accessing SpecialPage::$mList
         *
         * @return array
         */
        static function getList() {
                global $wgSpecialPages;
                global $wgDisableCounters, $wgDisableInternalSearch, $wgEmailAuthentication;
                global $wgEnableEmail, $wgEnableJavaScriptTest;

                if ( !is_object( self::$mList ) ) {
                        wfProfileIn( __METHOD__ );

                        if ( !$wgDisableCounters ) {
                                self::$mList['Popularpages'] = 'PopularpagesPage';
                        }

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

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

                        if ( $wgEnableEmail ) {
                                self::$mList['ChangeEmail'] = 'SpecialChangeEmail';
                        }

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

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

                        // Run hooks
                        // This hook can be used to remove undesired built-in special pages
                        wfRunHooks( 'SpecialPage_initList', array( &self::$mList ) );

                        // Cast to object: func()[$key] doesn't work, but func()->$key does
                        settype( self::$mList, 'object' );

                        wfProfileOut( __METHOD__ );
                }
                return self::$mList;
        }

        /**
         * Initialise and return the list of special page aliases.  Returns an object with
         * properties which can be accessed $obj->pagename - each property is an array of
         * aliases; the first in the array is the canonical alias.  All registered special
         * pages are guaranteed to have a property entry, and for that property array to
         * contain at least one entry (English fallbacks will be added if necessary).
         * @return Object
         */
        static function getAliasList() {
                if ( !is_object( self::$mAliases ) ) {
                        global $wgContLang;
                        $aliases = $wgContLang->getSpecialPageAliases();

                        // Objects are passed by reference by default, need to create a copy
                        $missingPages = clone self::getList();

                        self::$mAliases = array();
                        foreach ( $aliases as $realName => $aliasList ) {
                                foreach ( $aliasList as $alias ) {
                                        self::$mAliases[$wgContLang->caseFold( $alias )] = $realName;
                                }
                                unset( $missingPages->$realName );
                        }
                        foreach ( $missingPages as $name => $stuff ) {
                                self::$mAliases[$wgContLang->caseFold( $name )] = $name;
                        }

                        // Cast to object: func()[$key] doesn't work, but func()->$key does
                        self::$mAliases = (object)self::$mAliases;
                }
                return self::$mAliases;
        }

        /**
         * Given a special page name with a possible subpage, return an array
         * where the first element is the special page name and the second is the
         * subpage.
         *
         * @param $alias String
         * @return Array( String, String|null ), or array( null, null ) if the page is invalid
         */
        public static function resolveAlias( $alias ) {
                global $wgContLang;
                $bits = explode( '/', $alias, 2 );

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

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

                return array( $name, $par );
        }

        /**
         * Add a page to a certain display group for Special:SpecialPages
         *
         * @param $page Mixed: SpecialPage or string
         * @param $group String
         * @deprecated since 1.21 Override SpecialPage::getGroupName
         */
        public static function setGroup( $page, $group ) {
                wfDeprecated( __METHOD__, '1.21' );

                global $wgSpecialPageGroups;
                $name = is_object( $page ) ? $page->getName() : $page;
                $wgSpecialPageGroups[$name] = $group;
        }

        /**
         * Get the group that the special page belongs in on Special:SpecialPage
         *
         * @param $page SpecialPage
         * @return String
         * @deprecated since 1.21 Use SpecialPage::getFinalGroupName
         */
        public static function getGroup( &$page ) {
                wfDeprecated( __METHOD__, '1.21' );

                return $page->getFinalGroupName();
        }

        /**
         * Check if a given name exist as a special page or as a special page alias
         *
         * @param string $name name of a special page
         * @return Boolean: true if a special page exists with this name
         */
        public static function exists( $name ) {
                list( $title, /*...*/ ) = self::resolveAlias( $name );
                return property_exists( self::getList(), $title );
        }

        /**
         * Find the object with a given name and return it (or NULL)
         *
         * @param string $name Special page name, may be localised and/or an alias
         * @return SpecialPage|null SpecialPage object or null if the page doesn't exist
         */
        public static function getPage( $name ) {
                list( $realName, /*...*/ ) = self::resolveAlias( $name );
                if ( property_exists( self::getList(), $realName ) ) {
                        $rec = self::getList()->$realName;
                        if ( is_string( $rec ) ) {
                                $className = $rec;
                                return new $className;
                        } elseif ( is_array( $rec ) ) {
                                // @deprecated, officially since 1.18, unofficially since forever
                                wfDebug( "Array syntax for \$wgSpecialPages is deprecated, define a subclass of SpecialPage instead." );
                                $className = array_shift( $rec );
                                self::getList()->$realName = MWFunction::newObj( $className, $rec );
                        }
                        return self::getList()->$realName;
                } else {
                        return null;
                }
        }

        /**
         * Return categorised listable special pages which are available
         * for the current user, and everyone.
         *
         * @param $user User object to check permissions, $wgUser will be used
         *              if not provided
         * @return Array( String => Specialpage )
         */
        public static function getUsablePages( User $user = null ) {
                $pages = array();
                if ( $user === null ) {
                        global $wgUser;
                        $user = $wgUser;
                }
                foreach ( self::getList() 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;
        }

        /**
         * Return categorised listable special pages for all users
         *
         * @return Array( String => Specialpage )
         */
        public static function getRegularPages() {
                $pages = array();
                foreach ( self::getList() as $name => $rec ) {
                        $page = self::getPage( $name );
                        if ( $page->isListed() && !$page->isRestricted() ) {
                                $pages[$name] = $page;
                        }
                }
                return $pages;
        }

        /**
         * Return categorised listable special pages which are available
         * for the current user, but not for everyone
         *
         * @return Array( String => Specialpage )
         */
        public static function getRestrictedPages() {
                global $wgUser;
                $pages = array();
                foreach ( self::getList() as $name => $rec ) {
                        $page = self::getPage( $name );
                        if (
                                $page->isListed()
                                && $page->isRestricted()
                                && $page->userCanExecute( $wgUser )
                        ) {
                                $pages[$name] = $page;
                        }
                }
                return $pages;
        }

        /**
         * Execute a special page path.
         * The path may contain parameters, e.g. Special:Name/Params
         * Extracts the special page name and call the execute method, passing the parameters
         *
         * Returns a title object if the page is redirected, false if there was no such special
         * page, and true if it was successful.
         *
         * @param $title          Title object
         * @param $context        IContextSource
         * @param $including      Bool output is being captured for use in {{special:whatever}}
         *
         * @return bool
         */
        public static function executePath( Title &$title, IContextSource &$context, $including = false ) {
                wfProfileIn( __METHOD__ );

                // @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( $name );
                // Nonexistent?
                if ( !$page ) {
                        $context->getOutput()->setArticleRelated( false );
                        $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );

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

                        $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
                        wfProfileOut( __METHOD__ );
                        return false;
                }

                // 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->getTitle( $par );
                                $url = $title->getFullURL( $query );
                                $context->getOutput()->redirect( $url );
                                wfProfileOut( __METHOD__ );
                                return $title;
                        } else {
                                $context->setTitle( $page->getTitle( $par ) );
                        }

                } elseif ( !$page->isIncludable() ) {
                        wfProfileOut( __METHOD__ );
                        return false;
                }

                $page->including( $including );

                // Execute special page
                $profName = 'Special:' . $page->getName();
                wfProfileIn( $profName );
                $page->run( $par );
                wfProfileOut( $profName );
                wfProfileOut( __METHOD__ );
                return true;
        }

        /**
         * Just like executePath() but will override global variables and execute
         * the page in "inclusion" mode. Returns true if the execution was
         * successful or false if there was no such special page, or a title object
         * if it was a redirect.
         *
         * Also saves the current $wgTitle, $wgOut, $wgRequest, $wgUser and $wgLang
         * variables so that the special page will get the context it'd expect on a
         * normal request, and then restores them to their previous values after.
         *
         * @param $title Title
         * @param $context IContextSource
         *
         * @return String: HTML fragment
         */
        static function capturePath( Title $title, IContextSource $context ) {
                global $wgOut, $wgTitle, $wgRequest, $wgUser, $wgLang;

                // Save current globals
                $oldTitle = $wgTitle;
                $oldOut = $wgOut;
                $oldRequest = $wgRequest;
                $oldUser = $wgUser;
                $oldLang = $wgLang;

                // Set the globals to the current context
                $wgTitle = $title;
                $wgOut = $context->getOutput();
                $wgRequest = $context->getRequest();
                $wgUser = $context->getUser();
                $wgLang = $context->getLanguage();

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

                // And restore the old globals
                $wgTitle = $oldTitle;
                $wgOut = $oldOut;
                $wgRequest = $oldRequest;
                $wgUser = $oldUser;
                $wgLang = $oldLang;

                return $ret;
        }

        /**
         * Get the local name for a specified canonical name
         *
         * @param $name String
         * @param $subpage String|Bool
         *
         * @return String
         */
        static function getLocalNameFor( $name, $subpage = false ) {
                global $wgContLang;
                $aliases = $wgContLang->getSpecialPageAliases();

                if ( isset( $aliases[$name][0] ) ) {
                        $name = $aliases[$name][0];
                } else {
                        // Try harder in case someone misspelled the correct casing
                        $found = false;
                        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?" );
                                        $name = $values[0];
                                        $found = true;
                                        break;
                                }
                        }
                        if ( !$found ) {
                                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 );
        }

        /**
         * Get a title for a given alias
         *
         * @param $alias String
         *
         * @return Title or null if there is no such alias
         */
        static function getTitleForAlias( $alias ) {
                $name = self::resolveAlias( $alias );
                if ( $name ) {
                        return SpecialPage::getTitleFor( $name );
                } else {
                        return null;
                }
        }
}