From d0f249e16808feda4d6658fad1ea75114481778c Mon Sep 17 00:00:00 2001
From: Tobias <churchofemacs@users.mediawiki.org>
Date: Mon, 21 Sep 2009 19:21:12 +0000
Subject: [PATCH] New configuration variable $wgShowPageOnRedlink that can be
 set to show the page instead of an edit interface when visiting a red link.
 The value can be specified for specific usergroups and namespaces.

---
 RELEASE-NOTES                |  3 +++
 includes/DefaultSettings.php | 13 ++++++++++
 includes/EditPage.php        | 50 +++++++++++++++++++++++++++++++-----
 3 files changed, 60 insertions(+), 6 deletions(-)

diff --git a/RELEASE-NOTES b/RELEASE-NOTES
index 03954642ad..c96dd68e9b 100644
--- a/RELEASE-NOTES
+++ b/RELEASE-NOTES
@@ -239,6 +239,9 @@ it from source control: http://www.mediawiki.org/wiki/Download_from_SVN
   the root permission effectively grants all other permissions on a wiki.  Useful
   for debugging and administration.
 * (bug 16979) Tracking categories for __INDEX__ and __NOINDEX__
+* New configuration variable $wgShowPageOnRedlink that can be set to show the page
+  instead of an edit interface when visiting a red link. The value can be specified
+  for specific usergroups and namespaces.
 
 === Bug fixes in 1.16 ===
 
diff --git a/includes/DefaultSettings.php b/includes/DefaultSettings.php
index fa30f3e036..843cafc5c7 100644
--- a/includes/DefaultSettings.php
+++ b/includes/DefaultSettings.php
@@ -4269,3 +4269,16 @@ $wgUploadMaintenance = false;
  * Use old names for change_tags indices.
  */
 $wgOldChangeTagsIndex = false;
+
+/**
+ * View page instead of edit interface when visiting a red link
+ * There are three ways to define this variable:
+ *  1. Set $wgShowPageOnRedlink to true (false is default)
+ *  2. Set $wgShowPageOnRedlink['usergroup'] to false. If a user is member of at least one usergroup for which the variable 
+ *     has been set to false, the edit interface will be shown. Otherwise the page is shown.
+ *  3. Set $wgShowPageOnRedlink['usergroup'][NS_XY] to false. Same as 2., but you can specify the namespace. The namespace
+ *     is a numerical value (namespace index), you can use constants such as NS_MAIN or NS_USER_TALK.
+ * If you use an array (2. or 3.), the default will be true (for 1. it's false). In 2. and 3. there is no way to overwrite 
+ * a value 'false' once it has already been set (this is due to the undefined order of usergroups).
+ */
+$wgShowPageOnRedlink = false;
diff --git a/includes/EditPage.php b/includes/EditPage.php
index 5709a9898e..794072ca73 100644
--- a/includes/EditPage.php
+++ b/includes/EditPage.php
@@ -418,11 +418,11 @@ class EditPage {
 				}
 			}
 		}
-		
-		// If they used redlink=1 and the page exists, redirect to the main article
-		if ( $wgRequest->getBool( 'redlink' ) && $this->mTitle->exists() ) {
-			$wgOut->redirect( $this->mTitle->getFullURL() );
-		}
+
+		# Evaluate if the edit interface should be shown or
+		# if the page should be shown, in case redlink=true
+		if ( $wgRequest->getBool( 'redlink' ) )
+			$this->showPageOnRedlink();
 
 		wfProfileIn( __METHOD__."-business-end" );
 
@@ -487,7 +487,45 @@ class EditPage {
 		wfProfileOut( __METHOD__."-business-end" );
 		wfProfileOut( __METHOD__ );
 	}
-	
+
+	/*
+	 * Evaluate if the edit interface should be shown or the page, in case redlink=true. 
+	 * If the page exists, it is always shown. If it doesn't, it depends on the settings 
+	 * of $wgShowPageOnRedlink (see DefaultSettings for documentation).
+	 */
+	protected function showPageOnRedlink() {
+		global $wgShowPageOnRedlink, $wgUser, $wgRequest, $wgOut;
+		$redirectToPage = false;
+		# If the page exists (it has been created after the link has been emerged),
+		# redirect to the page instead of editing the current page
+		if ( $this->mTitle->exists() )
+			$wgOut->redirect( $this->mTitle->getFullURL() );
+		# Check site configuration ($wgShowPageOnRedlink)
+		if ( is_array( $wgShowPageOnRedlink ) ) {
+			$ns = $this->mTitle->getNamespace();
+			$groups = $wgUser->getEffectiveGroups();
+			# Gets overwritten if user is member of a group that has been specified:
+			$redirectToPage = true;
+			foreach ( $groups as $i => $group ) {
+				# Test if there is a rule for a specific usergroup and a specific namespace
+				if ( isset( $wgShowPageOnRedlink[$group][$ns] ) && $wgShowPageOnRedlink[$group][$ns] == false ) {
+					$redirectToPage = false;
+				}
+				# Test if there is a rule for a specific usergroup in all namespaces
+				elseif ( isset( $wgShowPageOnRedlink[$group] ) && !is_array( $wgShowPageOnRedlink[$group] ) 
+					   && $wgShowPageOnRedlink[$group] == false ) {
+					$redirectToPage = false;
+				}
+			}
+		}
+		else {
+			$redirectToPage = $wgShowPageOnRedlink;
+		}
+		if ( $redirectToPage ) {
+			$wgOut->redirect( $this->mTitle->getFullURL() );
+		}
+	}
+
 	protected function getEditPermissionErrors() {
 		global $wgUser;
 		$permErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
-- 
2.20.1