Added Director::redirected_to / Controller::redirectedTo() for redirection-detection

git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@41093 467b73ca-7a2a-4603-9d3b-597d59a354a9

core/control/Controller.php

@@ -414,6 +414,14 @@ class Controller extends ViewableData {
 		$this->response->redirect($url);
 	}
 	
+	/**
+	 * Tests whether a redirection has been requested.
+	 * @return string If redirect() has been called, it will return the URL redirected to.  Otherwise, it will return null;
+	 */
+	function redirectedTo() {
+		return $this->response->getHeader('Location');
+	} 
+	
 	/**
 	 * Get the Session object representing this Controller's session
 	 * @return Session

core/control/Director.php

@@ -188,14 +188,22 @@ class Director {
 	
 	/**
 	 * Redirect to another page.
-	   *  - $url can be an absolute URL
-	   *  - or it can be a URL relative to the "site base"
-	   *  - if it is just a word without an slashes, then it redirects to another action on the current controller.
+	 *  - $url can be an absolute URL
+	 *  - or it can be a URL relative to the "site base"
+	 *  - if it is just a word without an slashes, then it redirects to another action on the current controller.
 	 */
 	static function redirect($url) {
 		Controller::curr()->redirect($url);
 	}
 
+	/**
+	 * Tests whether a redirection has been requested.
+	 * @return string If redirect() has been called, it will return the URL redirected to.  Otherwise, it will return null;
+	 */
+	static function redirected_to() {
+		Controller::curr()->redirectedTo();
+	}
+
 	/**
 	 * Uses either the HTTP_REFERER or a manually set request-variable called _REDIRECT_BACK_URL.
      * This variable is needed in scenarios where not HTTP-Referer is sent (e.g when calling a page

core/control/HTTPResponse.php

@@ -73,7 +73,11 @@ class HTTPResponse extends Object {
 	 * @returns string
 	 */
 	function getHeader($header) {
-		return $this->headers[$header];
+		if(isset($this->headers[$header])) {
+			return $this->headers[$header];			
+		} else {
+			return null;
+		}
 	}
 	
 	function redirect($dest) {