[FEATURE] Make it possible to strip certain param.

Added extra configuration to strip certain user defined parameters in
the redirect. It also has the configuration possiblity to bypass
redirect if any of the following is present:
- no_cache is set
- Backend user is logged in
- type is set

class.tx_forcerealurls.php

@@ -4,19 +4,45 @@ class tx_forcerealurls {
 
 	function check($params,$pObj) {
 		if ($pObj->siteScript && $pObj->config['config']['tx_realurl_enable'] && (
-				substr($pObj->siteScript, 0, 9) == 'index.php' || 
-				substr($pObj->siteScript, 0, 1) == '?'
-			)) {
-					$baseURL = $pObj->config['config']['baseURL'];
-					$LD = $pObj->tmpl->linkData($pObj->page,'',$pObj->no_cache,'','',t3lib_div::getIndpEnv('QUERY_STRING'));
-					$url = $baseURL.$LD['totalURL'];
-
-					header('HTTP/1.1 301 Moved Permanently');
-					header('Location: '.$url);
-
-					exit;	
+            substr($pObj->siteScript, 0, 9) == 'index.php' || 
+            substr($pObj->siteScript, 0, 1) == '?'
+        )) {
+            $extConf = unserialize($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf']['forcerealurls']);
+
+            // Skipping section
+            if ($extConf['skip_if_logged_in'] && $GLOBALS['BE_USER']->user) {
+                return;
+            }
+
+            $query = array();
+            parse_str(t3lib_div::getIndpEnv('QUERY_STRING'), $query);
+
+            if ($extConf['skip_if_no_cache'] && $query['no_cache']) {
+                return;
+            }
+
+            if ($extConf['skip_if_typeNum'] && $query['type']) {
+                return;
+            }
+
+            // Stripping section
+            $strip_params = explode(' ', $extConf['strip_params']);
+            foreach($strip_params as $strip_param) {
+                unset ($query[$strip_param]);
+            }
+
+            $queryString = http_build_query($query);
+
+            $baseURL = $pObj->config['config']['baseURL'];
+            $LD = $pObj->tmpl->linkData($pObj->page,'',false,'','',$queryString);
+            $url = $baseURL.$LD['totalURL'];
+
+            header('HTTP/1.1 301 Moved Permanently');
+            header('Location: '.$url);
+            header('X-Redirected-By: forcerealurls');
+
+            exit;	
 		}
 	}
 }
 
-?>

ext_conf_template.txt

@@ -0,0 +1,12 @@
+  # cat=basic; type=string; label=Strip params. Strip these parameters if they are present in the query-string (Separate with spaces)
+strip_params = no_cache
+
+  # cat=basic; type=boolean; label=Logged in skip. Skip redirect if logged in. Check this if you do not want to redirect users that are logged in into the backend.
+skip_if_logged_in = 1
+
+  # cat=basic; type=boolean; label=No cache skip. Check this if you do not want to get redirects when no_cache is on. This is typically a development setting. This will take precedence over strip_params.
+skip_if_no_cache = 0
+
+  # cat=basic; type=boolean; label=typeNum skip. Check this if you do not want to get redirects for non-0 typeNum. This is often used if you are doing some sort of AJAX specific pages.
+skip_if_typeNum = 1
+