includes/SpecialPage.php

   1 <?php
   2 # SpecialPage: handling special pages and lists thereof
   3
   4 # $wgSpecialPages is a list of all SpecialPage objects. These objects are either instances of
   5 # SpecialPage or a sub-class thereof. They have an execute() method, which sends the HTML for the
   6 # special page to $wgOut. The parent class has an execute() method which distributes the call to
   7 # the historical global functions. Additionally, execute() also checks if the user has the
   8 # necessary access privileges and bails out if not.
   9
  10 # To add a special page at run-time, use SpecialPage::addPage().
  11 # DO NOT manipulate this array at run-time.
  12
  13 global $wgSpecialPages;
  14
  15 /* private */ $wgSpecialPages = array(
  16         'DoubleRedirects'       => new UnlistedSpecialPage ( 'DoubleRedirects' ),
  17         'BrokenRedirects'       => new UnlistedSpecialPage ( 'BrokenRedirects' ),
  18         'Disambiguations'       => new UnlistedSpecialPage ( 'Disambiguations' ),
  19
  20         "Userlogin"         => new SpecialPage( "Userlogin" ),
  21         "Userlogout"        => new UnlistedSpecialPage( "Userlogout" ),
  22         "Preferences"       => new SpecialPage( "Preferences" ),
  23         "Watchlist"         => new SpecialPage( "Watchlist" ),
  24         "Recentchanges"     => new SpecialPage( "Recentchanges" ),
  25         "Upload"            => new SpecialPage( "Upload" ),
  26         "Imagelist"         => new SpecialPage( "Imagelist" ),
  27         "Listusers"         => new SpecialPage( "Listusers" ),
  28         "Listadmins"        => new SpecialPage( "Listadmins" ),
  29         "Statistics"        => new SpecialPage( "Statistics" ),
  30         "Randompage"        => new SpecialPage( "Randompage" ),
  31         "Lonelypages"       => new SpecialPage( "Lonelypages" ),
  32         "Uncategorizedpages"=> new SpecialPage( "Uncategorizedpages" ),
  33         "Unusedimages"      => new SpecialPage( "Unusedimages" )
  34 );
  35 global $wgDisableCounters;
  36 if( !$wgDisableCounters )
  37 {
  38         $wgSpecialPages["Popularpages"] = new SpecialPage( "Popularpages" );
  39 }
  40 $wgSpecialPages = array_merge($wgSpecialPages, array (
  41         "Wantedpages"   => new SpecialPage( "Wantedpages" ),
  42         "Shortpages"    => new SpecialPage( "Shortpages" ),
  43         "Longpages"             => new SpecialPage( "Longpages" ),
  44         "Newpages"              => new SpecialPage( "Newpages" ),
  45         "Ancientpages"  => new SpecialPage( "Ancientpages" ),
  46         "Deadendpages"  => new SpecialPage( "Deadendpages" ),
  47         "Allpages"              => new SpecialPage( "Allpages" ),
  48         "Ipblocklist"   => new SpecialPage( "Ipblocklist" ),
  49         "Maintenance"   => new SpecialPage( "Maintenance" ),
  50         "Specialpages"  => new UnlistedSpecialPage( "Specialpages" ),
  51         "Contributions" => new UnlistedSpecialPage( "Contributions" ),
  52         "Emailuser"             => new UnlistedSpecialPage( "Emailuser" ),
  53         "Whatlinkshere" => new UnlistedSpecialPage( "Whatlinkshere" ),
  54         "Recentchangeslinked" => new UnlistedSpecialPage( "Recentchangeslinked" ),
  55         "Movepage"              => new UnlistedSpecialPage( "Movepage" ),
  56         "Blockme"       => new UnlistedSpecialPage( "Blockme" ),
  57         "Geo"   =>      new UnlistedSpecialPage( "Geo" ),
  58         "Validate"      =>      new UnlistedSpecialPage( "Validate" ),
  59         "Booksources"   => new SpecialPage( "Booksources" ),
  60         "Categories"    => new SpecialPage( "Categories" ),
  61         "Export"                => new SpecialPage( "Export" ),
  62         "Version"               => new SpecialPage( "Version" ),
  63         "Allmessages"   => new SpecialPage( "Allmessages" ),
  64         "Search"                => new UnlistedSpecialPage( "Search" ),
  65         "Blockip"               => new SpecialPage( "Blockip", "sysop" ),
  66         "Asksql"                => new SpecialPage( "Asksql", "sysop" ),
  67         "Undelete"              => new SpecialPage( "Undelete", "sysop" ),
  68         "Makesysop"             => new SpecialPage( "Makesysop", "sysop" ),
  69
  70 # Special:Import is half-written
  71 #       "Import"                => new SpecialPage( "Import", "sysop" ),
  72
  73         "Lockdb"                => new SpecialPage( "Lockdb", "developer" ),
  74         "Unlockdb"              => new SpecialPage( "Unlockdb", "developer" )
  75 ));
  76
  77 # Parent special page class, also static functions for handling the special page list
  78 class SpecialPage
  79 {
  80         /* private */ var $mName; # The name of the class, used in the URL. Also used for the default
  81                                   # <h1> heading, see getDescription()
  82         /* private */ var $mRestriction; # Minimum user level required to access this page, or ""
  83                                          # for anyone. Also used to categorise the pages in
  84                                                                          # Special:Specialpages
  85         /* private */ var $mListed; # Listed in Special:Specialpages?
  86         /* private */ var $mFunction; # Function name called by the default execute()
  87         /* private */ var $mFile; # File which needs to be included before the function above can be called
  88
  89         # Add a page to the list of valid special pages
  90         # $obj->execute() must send HTML to $wgOut then return
  91         # Use this for a special page extension
  92         /* static */ function addPage( &$obj ) {
  93                 global $wgSpecialPages;
  94                 $wgSpecialPages[$obj->mName] = $obj;
  95         }
  96
  97         # Remove a special page from the list
  98         # Occasionally used to disable expensive or dangerous special pages
  99         /* static */ function removePage( $name ) {
 100                 global $wgSpecialPages;
 101                 unset( $wgSpecialPages[$name] );
 102         }
 103
 104         # Find the object with a given name and return it (or NULL)
 105         /* static */ function &getPage( $name ) {
 106                 global $wgSpecialPages;
 107                 if ( array_key_exists( $name, $wgSpecialPages ) ) {
 108                         return $wgSpecialPages[$name];
 109                 } else {
 110                         return NULL;
 111                 }
 112         }
 113
 114         # Return categorised listable special pages
 115         # Returns a 2d array where the first index is the restriction name
 116         /* static */ function getPages() {
 117                 global $wgSpecialPages;
 118                 $pages = array(
 119                   "" => array(),
 120                   "sysop" => array(),
 121                   "developer" => array()
 122                 );
 123
 124                 foreach ( $wgSpecialPages as $name => $page ) {
 125                         if ( $page->isListed() ) {
 126                                 $pages[$page->getRestriction()][$page->getName()] =& $wgSpecialPages[$name];
 127                         }
 128                 }
 129                 return $pages;
 130         }
 131
 132         # Execute a special page path, which may contain parameters, e.g. Special:Name/Params
 133         # $title should be a title object
 134         # Extracts the special page name and call the execute method, passing the parameters
 135         /* static */ function executePath( &$title ) {
 136                 global $wgSpecialPages, $wgOut, $wgTitle;
 137
 138                 $bits = split( "/", $title->getDBkey(), 2 );
 139                 $name = $bits[0];
 140                 if( empty( $bits[1] ) ) {
 141                         $par = NULL;
 142                 } else {
 143                         $par = $bits[1];
 144                 }
 145
 146                 $page =& SpecialPage::getPage( $name );
 147                 if ( is_null( $page ) ) {
 148                         $wgOut->setArticleRelated( false );
 149                         $wgOut->setRobotpolicy( "noindex,follow" );
 150                         $wgOut->errorpage( "nosuchspecialpage", "nospecialpagetext" );
 151                 } else {
 152                         if($par !== NULL) {
 153                                 $wgTitle = Title::makeTitle( NS_SPECIAL, $name );
 154                         } else {
 155                                 $wgTitle = $title;
 156                         }
 157
 158                         $page->execute( $par );
 159                 }
 160         }
 161
 162         # Default constructor for special pages
 163         # Derivative classes should call this from their constructor
 164         #   $name - the name of the special page, as seen in links and URLs
 165         #   $restriction - the minimum user level required, e.g. "sysop" or "developer".
 166         #
 167         #       Note that if the user does not have the required level, an error message will
 168         #       be displayed by the default execute() method, without the global function ever
 169         #       being called.
 170         #
 171         #       If you override execute(), you can recover the default behaviour with userCanExecute()
 172         #       and displayRestrictionError()
 173         #
 174         #   $listed - whether the page is listed in Special:Specialpages
 175         #   $function - the function called by execute(). By default it is constructed from $name
 176         #   $file - the file which is included by execute(). It is also constructed from $name by default
 177         #
 178         function SpecialPage( $name = "", $restriction = "", $listed = true, $function = false, $file = "default" ) {
 179                 $this->mName = $name;
 180                 $this->mRestriction = $restriction;
 181                 $this->mListed = $listed;
 182                 if ( $function == false ) {
 183                         $this->mFunction = "wfSpecial{$name}";
 184                 } else {
 185                         $this->mFunction = $function;
 186                 }
 187                 if ( $file === "default" ) {
 188                         $this->mFile = "Special{$name}.php";
 189                 } else {
 190                         $this->mFile = $file;
 191                 }
 192         }
 193
 194         # Accessor functions, see the descriptions of the associated variables above
 195         function getName() { return $this->mName; }
 196         function getRestriction() { return $this->mRestriction; }
 197         function isListed() { return $this->mListed; }
 198
 199         # Checks if the given user (identified by an object) can execute this special page (as
 200         # defined by $mRestriction)
 201         function userCanExecute( &$user ) {
 202                 if ( $this->mRestriction == "" ) {
 203                         return true;
 204                 } else {
 205                         if ( in_array( $this->mRestriction, $user->getRights() ) ) {
 206                                 return true;
 207                         } else {
 208                                 return false;
 209                         }
 210                 }
 211         }
 212
 213         # Output an error message telling the user what access level they have to have
 214         function displayRestrictionError() {
 215                 global $wgOut;
 216                 if ( $this->mRestriction == "developer" ) {
 217                         $wgOut->developerRequired();
 218                 } else {
 219                         $wgOut->sysopRequired();
 220                 }
 221         }
 222
 223         # Sets headers - this should be called from the execute() method of all derived classes!
 224         function setHeaders() {
 225                 global $wgOut;
 226                 $wgOut->setArticleRelated( false );
 227                 $wgOut->setRobotPolicy( "noindex,follow" );
 228                 $wgOut->setPageTitle( $this->getDescription() );
 229         }
 230
 231         # Default execute method
 232         # Checks user permissions, calls the function given in mFunction
 233         function execute( $par ) {
 234                 global $wgUser, $wgOut, $wgTitle;
 235
 236                 $this->setHeaders();
 237
 238                 if ( $this->userCanExecute( $wgUser ) ) {
 239                         if ( $this->mFile ) {
 240                                 require_once( $this->mFile );
 241                         }
 242                         $func = $this->mFunction;
 243                         $func( $par );
 244                 } else {
 245                         $this->displayRestrictionError();
 246                 }
 247         }
 248
 249         # Returns the name that goes in the <h1> in the special page itself, and also the name that
 250         # will be listed in Special:Specialpages
 251         #
 252         # Derived classes can override this, but usually it is easier to keep the default behaviour.
 253         # Messages can be added at run-time, see MessageCache.php
 254         function getDescription() {
 255                 return wfMsg( strtolower( $this->mName ) );
 256         }
 257
 258         # Get a self-referential title object
 259         function getTitle() {
 260                 return Title::makeTitle( NS_SPECIAL, $this->mName );
 261         }
 262
 263         # Set whether this page is listed in Special:Specialpages, at run-time
 264         function setListed( $listed ) {
 265                 return wfSetVar( $this->mListed, $listed );
 266         }
 267 }
 268
 269 # Shortcut to construct a special page which is unlisted by default
 270 class UnlistedSpecialPage extends SpecialPage
 271 {
 272         function UnlistedSpecialPage( $name, $restriction = "", $function = false, $file = "default" ) {
 273                 SpecialPage::SpecialPage( $name, $restriction, false, $function, $file );
 274         }
 275 }