fix(request): Handle reverse proxy setting a port in Forwarded-For

Signed-off-by: Mikael Peigney <Mika56@users.noreply.github.com>

lib/private/AppFramework/Http/Request.php

@@ -607,10 +607,16 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 				if (isset($this->server[$header])) {
 					foreach (array_reverse(explode(',', $this->server[$header])) as $IP) {
 						$IP = trim($IP);
-
-						// remove brackets from IPv6 addresses
-						if (str_starts_with($IP, '[') && str_ends_with($IP, ']')) {
-							$IP = substr($IP, 1, -1);
+						$colons = substr_count($IP, ':');
+						if($colons > 1) {
+							// Extract IP from string with brackets and optional port
+							if(1 === preg_match('`^\[(.+?)\](?::\d+)?$`', $IP, $matches) && count($matches) === 1) {
+							    $IP = $matches[0];
+							}
+						}
+						elseif($colons === 1) {
+							// IPv4 with port
+							$IP = substr($IP, 0, strpos($IP, ':'));
 						}
 
 						if ($this->isTrustedProxy($trustedProxies, $IP)) {