direct symlink to website in /home/sites/[website_domain]/

Th automatically created symlink always point to the web root, not the 'web' folder in the web root, so you will probably have to create these symlinks manually.

 

Yes, you can have custom ISPConfig plugins that subscribe to events like the website insert event.

Here a small example:

PHP:

<?php

class xcustom_plugin {

    var $plugin_name = 'xcustom';
    var $class_name = 'xcustom';

    //* This function is called during ispconfig installation to determine
    //  if a symlink shall be created for this plugin.
    function onInstall() {
        global $conf;

        if($conf['services']['web'] == true) {
            return true;
        } else {
            return false;
        }
    }


    /*
         This function is called when the plugin is loaded
    */

    function onLoad() {
        global $app;

        /*
        Register for the events
        */
       
        $app->plugins->registerEvent('web_domain_insert', $this->plugin_name, 'insert');
        $app->plugins->registerEvent('web_domain_update', $this->plugin_name, 'update');
        $app->plugins->registerEvent('web_domain_delete', $this->plugin_name, 'delete');
    }
   
    function insert($event_name, $data) {
        global $app, $conf;
       
        // Add some code here
       
    }
   
    function update($event_name, $data) {
        global $app, $conf;
       
        // Add some code here
       
    }
   
    function delete($event_name, $data) {
        global $app, $conf;
       
        // Add some code here
       
    }
}

save this file as /usr/local/ispconfig/server/plugins-available/xcustom_plugin.inc.php

Then create a symlink in plugins-enabled folder that points to this plugin file and finally add your code in the insert, update and delete functions. The $data variable is an array which contains the whole new and old dataset of the website. e.g. the domain name is $data['new']['domain'] and in case the domain of a site changes, then you can find the old domain name in $data['old']['domain'] while the new one is $data['new']['domain'] so you can rename your symlink in such a case.