<?php
/**
 * Email Configuration Plugin
 * Opens external email config interface with signed authentication
 */
class email_config extends rcube_plugin
{
    public $task = 'settings|mail';
    private $secret_key = 'SHARED_SECRET_KEY_987654321';
    private $config_url = 'http://localhost:3009';

    function init()
    {
        // Register actions
        $this->register_action('plugin.email_config', array($this, 'email_config_init'));
        $this->register_action('plugin.email_config_generate_url', array($this, 'generate_signed_url'));

        // Add button to toolbar in mail view
        if ($this->rcmail->task == 'mail') {
            $this->add_button(array(
                'command'    => 'email_config_open',
                'label'      => 'Email Config',
                'title'      => 'Configure auto-reply and forwarding',
                'type'       => 'link',
                'class'      => 'button email-config',
            ), 'toolbar');

            $this->include_script('email_config.js');
        }

        // Add to settings menu
        if ($this->rcmail->task == 'settings') {
            $this->add_hook('settings_actions', array($this, 'settings_actions'));
        }
    }

    function settings_actions($args)
    {
        $args['actions'][] = array(
            'action' => 'plugin.email_config',
            'class'  => 'email-config',
            'label'  => 'Email Configuration',
            'title'  => 'Configure email rules',
        );
        return $args;
    }

    function email_config_init()
    {
        $this->register_handler('plugin.body', array($this, 'email_config_form'));
        $this->rcmail->output->set_pagetitle('Email Configuration');
        $this->rcmail->output->send('plugin');
    }

    function email_config_form()
    {
        $email = $this->rcmail->user->get_username();
        $url = $this->generate_url($email);

        $out = html::div(array('class' => 'box'),
            html::p(null, 'Manage your email configuration including out-of-office auto-replies and forwarding rules.') .
            html::p(null,
                html::a(array(
                    'href' => $url,
                    'target' => '_blank',
                    'class' => 'button mainaction',
                ), 'Open Email Configuration')
            )
        );

        return $out;
    }

    function generate_signed_url()
    {
        $email = $this->rcmail->user->get_username();
        $url = $this->generate_url($email);

        header('Content-Type: application/json');
        echo json_encode(array('success' => true, 'url' => $url));
        exit;
    }

    private function generate_url($email)
    {
        $expires = time() + 3600; // 1 hour validity
        $data = $email . '|' . $expires;
        $signature = hash_hmac('sha256', $data, $this->secret_key);

        return $this->config_url . '/?email=' . urlencode($email)
             . '&expires=' . $expires
             . '&signature=' . $signature;
    }
}