From clc-wiki

The purpose of these patches is described in the parent article at Project:Config:Wiki#Patch_to_enable_anonymous_edits_on_a_per-page_basis. Both need to be applied for the described behaviour to take effect. A version of the patch for earlier versions of MediaWiki (1.6.5) is also available.

EditPage.php

This patch was prepared against MediaWiki 1.9.2.

--- EditPage.php.orig	2007-02-05 10:14:58.000000000 +1100
+++ EditPage.php	2007-02-10 19:26:14.000000000 +1100
@@ -280,7 +280,7 @@
 	 */
 	function edit() {
 		global $wgOut, $wgUser, $wgRequest, $wgTitle;
-		global $wgEmailConfirmToEdit;
+		global $wgEmailConfirmToEdit, $wgGroupPermissions;
 
 		if ( ! wfRunHooks( 'AlternateEdit', array( &$this  ) ) )
 			return;
@@ -303,21 +303,10 @@
 
 		if ( ! $this->mTitle->userCanEdit() ) {
 			wfDebug( "$fname: user can't edit\n" );
-			$wgOut->readOnlyPage( $this->getContent(), true );
-			wfProfileOut( $fname );
-			return;
-		}
-		wfDebug( "$fname: Checking blocks\n" );
-		if ( !$this->preview && !$this->diff && $wgUser->isBlockedFrom( $this->mTitle, !$this->save ) ) {
-			# When previewing, don't check blocked state - will get caught at save time.
-			# Also, check when starting edition is done against slave to improve performance.
-			wfDebug( "$fname: user is blocked\n" );
-			$this->blockedPage();
-			wfProfileOut( $fname );
-			return;
-		}
-		if ( !$wgUser->isAllowed('edit') ) {
-			if ( $wgUser->isAnon() ) {
+			if ( !$wgUser->isAllowed('edit') && $wgUser->isAnon() &&
+			  $wgGroupPermissions['user' ]['edit'] &&
+			  !array_diff($this->mTitle->getRestrictions('edit'),
+			     array('*', 'user')) ) {
 				wfDebug( "$fname: user must log in\n" );
 				$this->userNotLoggedInPage();
 				wfProfileOut( $fname );
@@ -329,6 +318,16 @@
 				return;
 			}
 		}
+		wfDebug( "$fname: Checking blocks\n" );
+		if ( !$this->preview && !$this->diff && $wgUser->isBlockedFrom( $this->mTitle, !$this->save ) ) {
+			# When previewing, don't check blocked state - will get caught at save time.
+			# Also, check when starting edition is done against slave to improve performance.
+			wfDebug( "$fname: user is blocked\n" );
+			$this->blockedPage();
+			wfProfileOut( $fname );
+			return;
+		}
+
 		if ($wgEmailConfirmToEdit && !$wgUser->isEmailConfirmed()) {
 			wfDebug("$fname: user must confirm e-mail address\n");
 			$this->userNotConfirmedPage();
@@ -653,14 +652,16 @@
 			return true;
 		}
 		
-		if ( !$wgUser->isAllowed('edit') ) {
-			if ( $wgUser->isAnon() ) {
+		if ( ! $this->mTitle->userCanEdit() ) {
+			if ( !$wgUser->isAllowed('edit') && $wgUser->isAnon() &&
+			  $wgGroupPermissions['user' ]['edit'] &&
+			  !array_diff($this->mTitle->getRestrictions('edit'),
+			    array('*', 'user')) ) {
 				$this->userNotLoggedInPage();
 				wfProfileOut( "$fname-checks" );
 				wfProfileOut( $fname );
 				return false;
-			}
-			else {
+			} else {
 				$wgOut->readOnlyPage();
 				wfProfileOut( "$fname-checks" );
 				wfProfileOut( $fname );

Title.php

This patch was also prepared against MediaWiki 1.9.2.

--- Title.php.orig	2007-02-05 10:14:59.000000000 +1100
+++ Title.php	2007-02-10 19:13:10.000000000 +1100
@@ -1033,7 +1033,8 @@
 				
 		if( $action == 'edit' || $action == '' ) {
 			$r = $this->getRestrictions( 'edit' );
-			foreach( $wgRestrictionLevels as $level ) {
+			if (in_array('*', $r)) {
+			} else foreach( $wgRestrictionLevels as $level ) {
 				if( in_array( $level, $r ) && $level != '' ) {
 					return( true );
 				}
@@ -1042,7 +1043,8 @@
 		
 		if( $action == 'move' || $action == '' ) {
 			$r = $this->getRestrictions( 'move' );
-			foreach( $wgRestrictionLevels as $level ) {
+			if (in_array('*', $r)) {
+			} else foreach( $wgRestrictionLevels as $level ) {
 				if( in_array( $level, $r ) && $level != '' ) {
 					return( true );
 				}
@@ -1117,17 +1119,6 @@
 			return false;
 		}
 
-		foreach( $this->getRestrictions($action) as $right ) {
-			// Backwards compatibility, rewrite sysop -> protect
-			if ( $right == 'sysop' ) {
-				$right = 'protect';
-			}
-			if( '' != $right && !$wgUser->isAllowed( $right ) ) {
-				wfProfileOut( $fname );
-				return false;
-			}
-		}
-
 		if( $action == 'move' &&
 			!( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
 			wfProfileOut( $fname );
@@ -1135,11 +1126,16 @@
 		}
 
 		if( $action == 'create' ) {
-			if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
-				( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
-				wfProfileOut( $fname );
-				return false;
-			}
+			$action .= $this->isTalkPage() ? 'talk' : 'page';
+		}
+
+		# Must come after the 'create' mapping
+		$rGroups = $this->getRestrictions($action);
+		$eGroups = $wgUser->getEffectiveGroups();
+		if ( (($rGroups && !array_intersect($rGroups, $eGroups)) ||
+		  !$wgUser->isAllowed($action)) && !in_array('*', $rGroups) ) {
+			wfProfileOut( $fname );
+			return false;
 		}
 
 		wfProfileOut( $fname );
@@ -1328,8 +1324,10 @@
 			$temp = explode( '=', trim( $restrict ) );
 			if(count($temp) == 1) {
 				// old format should be treated as edit/move restriction
-				$this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
-				$this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
+				if ($temp[0] != '') {
+					$this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
+					$this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
+				}
 			} else {
 				$this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
 			}