<?php

declare(strict_types=1);

namespace Sabre\DAV\Mount;

use Sabre\DAV;
use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;

/**
 * This plugin provides support for RFC4709: Mounting WebDAV servers.
 *
 * Simply append ?mount to any collection to generate the davmount response.
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class Plugin extends DAV\ServerPlugin
{
    /**
     * Reference to Server class.
     *
     * @var DAV\Server
     */
    protected $server;

    /**
     * Initializes the plugin and registers event handles.
     *
     * @param DAV\Server $server
     */
    public function initialize(DAV\Server $server)
    {
        $this->server = $server;
        $this->server->on('method:GET', [$this, 'httpGet'], 90);
    }

    /**
     * 'beforeMethod' event handles. This event handles intercepts GET requests ending
     * with ?mount.
     *
     * @param RequestInterface  $request
     * @param ResponseInterface $response
     *
     * @return bool
     */
    public function httpGet(RequestInterface $request, ResponseInterface $response)
    {
        $queryParams = $request->getQueryParameters();
        if (!array_key_exists('mount', $queryParams)) {
            return;
        }

        $currentUri = $request->getAbsoluteUrl();

        // Stripping off everything after the ?
        list($currentUri) = explode('?', $currentUri);

        $this->davMount($response, $currentUri);

        // Returning false to break the event chain
        return false;
    }

    /**
     * Generates the davmount response.
     *
     * @param ResponseInterface $response
     * @param string            $uri      absolute uri
     */
    public function davMount(ResponseInterface $response, $uri)
    {
        $response->setStatus(200);
        $response->setHeader('Content-Type', 'application/davmount+xml');
        ob_start();
        echo '<?xml version="1.0"?>', "\n";
        echo "<dm:mount xmlns:dm=\"http://purl.org/NET/webdav/mount\">\n";
        echo '  <dm:url>', htmlspecialchars($uri, ENT_NOQUOTES, 'UTF-8'), "</dm:url>\n";
        echo '</dm:mount>';
        $response->setBody(ob_get_clean());
    }
}
