ZP-1058 autodiscover: Rework exception handling to match z-push core.

Released under the Affero GNU General Public License (AGPL) version
3.

src/autodiscover/autodiscover.php

@@ -104,7 +104,20 @@ class ZPushAutodiscover {
             }
         }
 
-        catch (AuthenticationRequiredException $ex) {
+        catch (Exception $ex) {
+            // Extract any previous exception message for logging purpose.
+            $exclass = get_class($ex);
+            $exception_message = $ex->getMessage();
+            if($ex->getPrevious()){
+                do {
+                    $current_exception = $ex->getPrevious();
+                    $exception_message .= ' -> ' . $current_exception->getMessage();
+                } while($current_exception->getPrevious());
+            }
+
+            ZLog::Write(LOGLEVEL_FATAL, sprintf('Exception: (%s) - %s', $exclass, $exception_message));
+
+            if ($ex instanceof AuthenticationRequiredException) {
                 if (isset($incomingXml)) {
                     // log the failed login attemt e.g. for fail2ban
                     if (defined('LOGAUTHFAIL') && LOGAUTHFAIL != false)
@@ -116,7 +129,7 @@ class ZPushAutodiscover {
                 http_response_code(401);
                 header('WWW-Authenticate: Basic realm="ZPush"');
             }
-        catch (ZPushException $ex) {
+            else if ($ex instanceof ZPushException) {
                 ZLog::Write(LOGLEVEL_ERROR, sprintf("Unable to complete autodiscover because of ZPushException. Error: %s", $ex->getMessage()));
                 if(!headers_sent()) {
                     header('HTTP/1.1 '. $ex->getHTTPCodeString());
@@ -127,6 +140,7 @@ class ZPushAutodiscover {
             }
             $this->sendResponse($response);
         }
+    }
 
     /**
      * Processes the incoming XML request and parses it to a SimpleXMLElement.