RestrictAccessByCategoryAndGroup.php
The original extension was written by Andrés Orencio Ramirez Perez[1] and has been customized by User:Ralph to function as outlined in category:Access Control for this wiki.
<?php
// History:
// 2022-09-19 Ralph Holland - made category:edit: markings inclusive while excluding users that have no corresponding marking for the edit action.
// 2022-09-18 Ralph Holland - Now User:category is not completely exclusive, other User:category can be put on page to share with another users
// public is not public when a private has been placed on the page or an exclusive user:category is on the page.
// white-listed pages cannot override an exclusive category denying access
// 2022-08-15 Ralph Holland - made pages without a category not public, made private exclusive, implemented category:User:<name> as exclusive page access
//
if ( !defined( 'MEDIAWIKI' ) ) {
die( 'Not a valid entry point.' );
}
$wgExtensionCredits['parserhook'][] = array(
'name' => 'Restrict access by category and group',
'author' => 'Andrés Orencio Ramirez Perez & Ralph Holland',
'url' => 'https://www.mediawiki.org/wiki/Extension:Restrict_access_by_category_and_group',
'description' => 'Allows to restrict access to pages by users groups and page categories: See [[Security]]',
'mailto' => 'ralph.holland@live.com.au',
'version' => '2.0.2-RBH-adapted-for-this-wiki'
);
$wgHooks['userCan'][] = 'restrictAccessByCategoryAndGroup';
//$wgHooks['getUserPermissionsErrors'][] = 'restrictAccessByCategoryAndGroup';
// old-school: this just outputs $a as a string after a few spaces into the HTML response so I can see what is happening without running an IDE/debugger
function debug( $a ) {
for ($i =0; $i < 35; $i++) {
print " ";
}
print "$a";
}
function restrictAccessByCategoryAndGroup( $title, $user, $action, $result ) {
# debug("Ralph is debugging access controls ATM title=".$title." user=".$user." action=".$action."<br/>");
global $wgGroupPermissions;
global $wgWhitelistRead;
global $wgLang;
global $wgHooks;
global $wgContLang;
global $wgVersion;
// strip the prefix of Talk etc off
$posn = strpos( $title,":");
$prefix = $posn > -1 ? substr( $title, 0, $posn ) : "";
$page = $posn > -1 ? substr( $title, $posn+1 ) : $title;
# debug( "RBH is debugging page=".$page." prefix=".$prefix." action=".$action." user=".$user."</br>" );
//These are special pages to be white-listed
if ( $title == 'Special:UserLogin') {
# debug( "*** login permitted" );
return true;
}
else if ( $title == 'Special:UserLogout') {
# debug( "*** logout permitted" );
return true;
}
else if ( $title == 'Special:Badtitle') {
# debug( "*** bad title permitted" );
return true;
}
else if ( in_array('sysop',$user->getGroups()) ) {
# debug( "*** sysop can see all pages" );
return true;
}
// Build up System categories from the title's categories
$systemCategory = array();
// get the users groups
$userGroups = $user->getGroups();
$hasUserCategory = false;
$userCategoryMatched = false;
// now check the page categories against the system groups
$publicPage = false;
$privatePage = false;
$editUserMatched = false;
$editGroupMatched = false;
// now process page categories
foreach ( array_change_key_case( $title->getParentCategories(), CASE_LOWER ) as $key => $value ) {
$formattedKey = substr( $key, ( strpos( $key, ":" ) + 1 ) );
#debug( "category:".$formattedKey."<br/>" );
// check for the exclusive category public
if ( $formattedKey=='public' ) {
$publicPage = true;
}
// check for the exclusive category private
elseif ( $formattedKey=='private' ) {
// check that the user holds private group
if (! in_array($formattedKey,$userGroups) ) {
$privatePage = true;
}
}
// check for the exclusive category user:*
elseif ( strpos( $formattedKey, 'user:' ) === 0 ) {
// these are special user categories e.g. [[User:Ralph]]
$hasUserCategory = true;
$name = 'user:'.strtolower($user->getName());
# debug( $formattedKey.' '.$name.'<-name<br/>' );
if ( $name && $formattedKey==$name ) {
# debug( '**** user permitted by user category'.$formattedKey.' '.'allowed<br/>' );
$userCategoryMatched = true;
}
}
elseif ( strpos( $formattedKey, 'edit:user:' ) === 0 ) {
// check if user is permitted to edit
if ($action === 'edit') {
$hasEdit = true;
$name = 'edit:user:'.strtolower($user->getName());
if ($name === $formattedKey) {
# debug('*** edit user matched'.$name);
$editUserMatched = true;
}
}
}
elseif ( strpos( $formattedKey, 'edit:' ) === 0 ) {
// check is user has a group to permit edit
if ($action === 'edit') {
$hasEdit = true;
$group = substr( $formattedKey, ( strpos( $formattedKey, ":" ) + 1 ) );
if ( in_array($group,$userGroups) ) {
# debug('*** edit group matched '.$group);
$editGroupMatched = true;
}
}
}
else {
// build up non-exclusive categories that were assigned to the page
$systemCategory[ $formattedKey ] = $value;
}
}
// check if category:edit: marking found
if ($hasEdit) {
if ($editGroupMatched) {
# debug('*** matched a category:edit:group marking');
return true;
}
else if ($editUserMatched) {
# debug('*** matched a category:edit:user: marking
return true;
}
else {
# debug('--- denied user edit by category:edit marking');
return false;
}
}
// check if page marked with the user:category
if ($userCategoryMatched) {
# debug('*** user allowed by user:category');
return true;
}
// check if user is excluded by page marked private
if ($privatePage) {
# debug('--- denied because the page was marked private');
return false;
}
// check if user is excluded by another user:category
if ($hasUserCategory) {
# debug('--- denied by user:category');
return false;
}
// check if page was marked as public
if ($publicPage) {
# debug('*** permitted by public page');
return true;
}
// honour the existing white-list mechanism
if ( count( $wgWhitelistRead ) != 0 ) {
if ( in_array( $title, $wgWhitelistRead ) ) {
# debug("*** white listed" );
return true;
}
}
// check if page has any remaining categories
if ( count( $systemCategory ) == 0 ) {
if ( count($userGroups) > 0 ) {
# debug('*** logged in users can access pages without categories');
return true;
}
# debug('-- anonymous user cannot access pages without categories');
return false;
} else {
// check remaining page categories for inclusive private permissions
// users must be logged in to process remaining category markings
if ( count($userGroups) != 0) {
// for each group permission ...
$hasPrivateCategories = false;
foreach ( $wgGroupPermissions as $key => $value ) {
# debug( 'group->'.$key.' '.$action.' '.$title.'<br/>' );
// ... if the group permission is marked as 'private' then check ...
if ( isset( $wgGroupPermissions[$key]['private'] ) ) {
$hasPrivateCategories = true;
// ... if page is marked with a category that corresponds to the private group
if ( array_key_exists( strtolower( str_replace( " ", "_", $key ) ), $systemCategory ) ) {
// ... permit access if user is assigned the group
if ( in_array( $key, $userGroups) ) {
# debug( '*** permitted user holds the group '.$key );
return true;
}
}
}
}
if (!$hasPrivateCategories) {
# debug('*** user permitted to access a page that does not contain private categories');
return true;
}
}
}
# debug("--- user does not hold an appropriate private category and page is not marked for their access");
return false;
}
installation
The extension is installed in the file location:
.../mediawiki/extensions/rabcg/RestrictAccessByCategoryAndGroup.php
The extension is loaded from the:
.../mediawiki/LocalSettings.php
access control checks
The access control reference data is defined in LocalSettings.php as follows:
- privileges are denied by:
$wgGroupPermissions[<group>]['*'] = false;
- and the private privilege for a group is defined by:
$wgGroupPermissions[<group>]['private'] = true;
Those groups may be assigned to a user account via the Special:UserRights page, where the privilege groups that were assigned are accessible via $user->getGroups() in this extension.
The Access Control checks are performed in this order as follows:
- the special pages:
- are always permitted.
- pages marked with any Categories are examined to determine if they are marked with an Access Control marking as follows:
- when marked with a category:user: mark (containing a user name) then the page is accessible only to:
- a sysop,
- or one of the users that matches any category:user: marking, otherwise the page is inaccessible to any other users.
- when marked with a private [[:category:]] including a group (e.g. category:lesson) then then logged-in user is permitted to access the page when that user is a member of the group (e.g. the lesson group) i.e. if the group has been assigned in to the user in the Special:UserRights pages.
- when marked with category:private the page is inaccessible to any user that is not a member of the category:private group, except for a sysop who is permitted to access any page
- when marked with a category:edit: mark the page is restricted for edit unless there is:
- a category:edit:user: containing a user to permit that user, or
- a category:edit: containing a group of which the user is a member i.e. the user has been assigned the group with the private privilege.
- when marked with category:public the page is visible to any user, provide none of the previous read access checks have failed to grant access.
- when marked with a category:user: mark (containing a user name) then the page is accessible only to:
- pages that are not marked with any categories are not accessible to an anonymous user.
- only pages marked with category:public or pages that have been white-listed may be viewed by any user, including anonynous users (those who have not logged-in), where the white-listing check includes the three special pages enumerated above.