includes/specialpage/RedirectSpecialPage.php

   1 <?php
   2 /**
   3  * Shortcuts to construct a special page alias.
   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  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Shortcut to construct a special page alias.
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 abstract class RedirectSpecialPage extends UnlistedSpecialPage {
  30         // Query parameters that can be passed through redirects
  31         protected $mAllowedRedirectParams = [];
  32
  33         // Query parameters added by redirects
  34         protected $mAddedRedirectParams = [];
  35
  36         /**
  37          * @param string|null $subpage
  38          */
  39         public function execute( $subpage ) {
  40                 $redirect = $this->getRedirect( $subpage );
  41                 $query = $this->getRedirectQuery();
  42                 // Redirect to a page title with possible query parameters
  43                 if ( $redirect instanceof Title ) {
  44                         $url = $redirect->getFullURL( $query );
  45                         $this->getOutput()->redirect( $url );
  46
  47                         return $redirect;
  48                 } elseif ( $redirect === true ) {
  49                         // Redirect to index.php with query parameters
  50                         $url = wfAppendQuery( wfScript( 'index' ), $query );
  51                         $this->getOutput()->redirect( $url );
  52
  53                         return $redirect;
  54                 } else {
  55                         $class = get_class( $this );
  56                         throw new MWException( "RedirectSpecialPage $class doesn't redirect!" );
  57                 }
  58         }
  59
  60         /**
  61          * If the special page is a redirect, then get the Title object it redirects to.
  62          * False otherwise.
  63          *
  64          * @param string|null $subpage
  65          * @return Title|bool
  66          */
  67         abstract public function getRedirect( $subpage );
  68
  69         /**
  70          * Return part of the request string for a special redirect page
  71          * This allows passing, e.g. action=history to Special:Mypage, etc.
  72          *
  73          * @return array|bool
  74          */
  75         public function getRedirectQuery() {
  76                 $params = [];
  77                 $request = $this->getRequest();
  78
  79                 foreach ( array_merge( $this->mAllowedRedirectParams,
  80                                 [ 'uselang', 'useskin', 'debug' ] // parameters which can be passed to all pages
  81                         ) as $arg ) {
  82                         if ( $request->getVal( $arg, null ) !== null ) {
  83                                 $params[$arg] = $request->getVal( $arg );
  84                         } elseif ( $request->getArray( $arg, null ) !== null ) {
  85                                 $params[$arg] = $request->getArray( $arg );
  86                         }
  87                 }
  88
  89                 foreach ( $this->mAddedRedirectParams as $arg => $val ) {
  90                         $params[$arg] = $val;
  91                 }
  92
  93                 return count( $params )
  94                         ? $params
  95                         : false;
  96         }
  97
  98         /**
  99          * Indicate if the target of this redirect can be used to identify
 100          * a particular user of this wiki (e.g., if the redirect is to the
 101          * user page of a User). See T109724.
 102          *
 103          * @since 1.27
 104          * @return bool
 105          */
 106         public function personallyIdentifiableTarget() {
 107                 return false;
 108         }
 109 }
 110
 111 /**
 112  * @ingroup SpecialPage
 113  */
 114 abstract class SpecialRedirectToSpecial extends RedirectSpecialPage {
 115         /** @var string Name of redirect target */
 116         protected $redirName;
 117
 118         /** @var string Name of subpage of redirect target */
 119         protected $redirSubpage;
 120
 121         function __construct(
 122                 $name, $redirName, $redirSubpage = false,
 123                 $allowedRedirectParams = [], $addedRedirectParams = []
 124         ) {
 125                 parent::__construct( $name );
 126                 $this->redirName = $redirName;
 127                 $this->redirSubpage = $redirSubpage;
 128                 $this->mAllowedRedirectParams = $allowedRedirectParams;
 129                 $this->mAddedRedirectParams = $addedRedirectParams;
 130         }
 131
 132         /**
 133          * @param string|null $subpage
 134          * @return Title|bool
 135          */
 136         public function getRedirect( $subpage ) {
 137                 if ( $this->redirSubpage === false ) {
 138                         return SpecialPage::getTitleFor( $this->redirName, $subpage );
 139                 }
 140
 141                 return SpecialPage::getTitleFor( $this->redirName, $this->redirSubpage );
 142         }
 143 }
 144
 145 /**
 146  * Superclass for any RedirectSpecialPage which redirects the user
 147  * to a particular article (as opposed to user contributions, logs, etc.).
 148  *
 149  * For security reasons these special pages are restricted to pass on
 150  * the following subset of GET parameters to the target page while
 151  * removing all others:
 152  *
 153  * - useskin, uselang, printable: to alter the appearance of the resulting page
 154  *
 155  * - redirect: allows viewing one's user page or talk page even if it is a
 156  * redirect.
 157  *
 158  * - rdfrom: allows redirecting to one's user page or talk page from an
 159  * external wiki with the "Redirect from..." notice.
 160  *
 161  * - limit, offset: Useful for linking to history of one's own user page or
 162  * user talk page. For example, this would be a link to "the last edit to your
 163  * user talk page in the year 2010":
 164  * https://en.wikipedia.org/wiki/Special:MyPage?offset=20110000000000&limit=1&action=history
 165  *
 166  * - feed: would allow linking to the current user's RSS feed for their user
 167  * talk page:
 168  * https://en.wikipedia.org/w/index.php?title=Special:MyTalk&action=history&feed=rss
 169  *
 170  * - preloadtitle: Can be used to provide a default section title for a
 171  * preloaded new comment on one's own talk page.
 172  *
 173  * - summary : Can be used to provide a default edit summary for a preloaded
 174  * edit to one's own user page or talk page.
 175  *
 176  * - preview: Allows showing/hiding preview on first edit regardless of user
 177  * preference, useful for preloaded edits where you know preview wouldn't be
 178  * useful.
 179  *
 180  * - redlink: Affects the message the user sees if their talk page/user talk
 181  * page does not currently exist. Avoids confusion for newbies with no user
 182  * pages over why they got a "permission error" following this link:
 183  * https://en.wikipedia.org/w/index.php?title=Special:MyPage&redlink=1
 184  *
 185  * - debug: determines whether the debug parameter is passed to load.php,
 186  * which disables reformatting and allows scripts to be debugged. Useful
 187  * when debugging scripts that manipulate one's own user page or talk page.
 188  *
 189  * @par Hook extension:
 190  * Extensions can add to the redirect parameters list by using the hook
 191  * RedirectSpecialArticleRedirectParams
 192  *
 193  * This hook allows extensions which add GET parameters like FlaggedRevs to
 194  * retain those parameters when redirecting using special pages.
 195  *
 196  * @par Hook extension example:
 197  * @code
 198  *    $wgHooks['RedirectSpecialArticleRedirectParams'][] =
 199  *        'MyExtensionHooks::onRedirectSpecialArticleRedirectParams';
 200  *    public static function onRedirectSpecialArticleRedirectParams( &$redirectParams ) {
 201  *        $redirectParams[] = 'stable';
 202  *        return true;
 203  *    }
 204  * @endcode
 205  *
 206  * @ingroup SpecialPage
 207  */
 208 abstract class RedirectSpecialArticle extends RedirectSpecialPage {
 209         function __construct( $name ) {
 210                 parent::__construct( $name );
 211                 $redirectParams = [
 212                         'action',
 213                         'redirect', 'rdfrom',
 214                         # Options for preloaded edits
 215                         'preload', 'preloadparams', 'editintro', 'preloadtitle', 'summary', 'nosummary',
 216                         # Options for overriding user settings
 217                         'preview', 'minor', 'watchthis',
 218                         # Options for history/diffs
 219                         'section', 'oldid', 'diff', 'dir',
 220                         'limit', 'offset', 'feed',
 221                         # Misc options
 222                         'redlink',
 223                         # Options for action=raw; missing ctype can break JS or CSS in some browsers
 224                         'ctype', 'maxage', 'smaxage',
 225                 ];
 226
 227                 Hooks::run( "RedirectSpecialArticleRedirectParams", [ &$redirectParams ] );
 228                 $this->mAllowedRedirectParams = $redirectParams;
 229         }
 230 }