[FIX] Resolves an issue where setting an alternate_base_url caused

infinite redirections (since the mapping ended up with an absolute link).

README.md

@@ -1,6 +1,6 @@
 # [misdirection](https://packagist.org/packages/nglasl/silverstripe-misdirection)
 
-_The current release is **2.2.24**_
+_The current release is **2.2.25**_
 
 > A module for SilverStripe which will allow both simple and regular expression link redirections based on customisable mappings, either hooking into a page not found or replacing the default automated URL handling.
 

code/dataobjects/LinkMapping.php

@@ -350,7 +350,19 @@ public function getLink() {
 
 				// When appropriate, prepend the base URL to match a page redirection.
 
-				return MisdirectionService::is_external_URL($link) ? (ClassInfo::exists('Multisites') ? HTTP::setGetVar('misdirected', true, $link) : $link) : Controller::join_links(Director::baseURL(), $link);
+				$prepended = Controller::join_links(Director::baseURL(), $link);
+				if(MisdirectionService::is_external_URL($link)) {
+					return ClassInfo::exists('Multisites') ? HTTP::setGetVar('misdirected', true, $link) : $link;
+				}
+
+				// This is needed, otherwise infinitely recursive mappings won't be detected in advance.
+
+				else if(MisdirectionService::is_external_URL($prepended)) {
+					return $link;
+				}
+				else {
+					return $prepended;
+				}
 			}
 		}