Added option "cas_disable_for_domains"

cas_authn/cas_authn.php

@@ -33,6 +33,10 @@ function init() {
 
         // load plugin configuration
         $this->load_config();
+
+        if ($this->isDisabled()) {
+            return;
+        }
 
         // add application hooks
         $this->add_hook('startup', array($this, 'startup'));
@@ -42,6 +46,18 @@ function init() {
         $this->add_hook('template_object_loginform', array($this, 'add_cas_login_html'));
     }
 
+    function isDisabled() {
+        $cfg = rcmail::get_instance()->config->all();
+        if (is_array($cfg['cas_disable_for_domains'])) {
+            foreach ($cfg['cas_disable_for_domains'] as $domain_pattern) {
+                if (preg_match($domain_pattern, $_SERVER['SERVER_NAME'])) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
     /**
      * Handle plugin-specific actions
      * These actions are handled at the startup hook rather than registered as

cas_authn/config.inc.php.dist

@@ -9,6 +9,10 @@
 //     the CAS login URL. This means nobody will ever see the RC login page.
 $rcmail_config['cas_force'] = false;
 
+// Disable this plugin for 'SERVER_NAME' that matches to a pattern from the
+//     array:
+$rcmail_config['cas_disable_for_domains'] = array("/nocas\.example\.com/", "/.*\.nocas\.example\.com/");
+
 // whether to act as a CAS proxy. If set to true, a proxy ticket will be
 //     retrieved from the CAS server to be used as password for logging into
 //     the IMAP server. This is the preferred method of authenticating