add signature template to new_user_dialog plugin

plugins/new_user_dialog/README.md

@@ -0,0 +1,15 @@
+# RoundCube New User Dialog Plugin
+When a new user is created, this plugin checks the default identity and sets a session flag in case it is incomplete. An overlay box will appear on the screen until the user has reviewed/completed his identity.
+
+## Configuration
+Optional you can specify the default signature, `@EMAIL@` is replaced by the user email.
+
+```
+$config['new_user_dialog_signature_text'] = '
+Your Name
+
+E-Mail : @EMAIL@
+Website: some.domain
+Phone: 01234/567890
+';
+```

plugins/new_user_dialog/new_user_dialog.php

@@ -19,9 +19,12 @@ class new_user_dialog extends rcube_plugin
 
     function init()
     {
+        $rcmail = rcmail::get_instance();
+        $this->load_config();
         $this->add_hook('identity_create', [$this, 'create_identity']);
         $this->add_hook('render_page', [$this, 'render_page']);
         $this->register_action('plugin.newusersave', [$this, 'save_data']);
+        $this->signature_text = $rcmail->config->get('new_user_dialog_signature_text');
     }
 
     /**
@@ -89,6 +92,7 @@ function render_page($p)
                     'name' => '_signature',
                     'rows' => '5',
                 ],
+                $out = str_replace('@EMAIL@', rcube_utils::idn_to_utf8($identity['email']) , $this->signature_text ?? ''),
                 $identity['signature']
             ));