<?php

declare(strict_types=1);

/**
 * @copyright Copyright (c) 2018 John Molakvoæ <skjnldsv@protonmail.com>
 *
 * @author John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 */

namespace OCA\DAV\CardDAV;

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

class MultiGetExportPlugin extends DAV\ServerPlugin {

	/** @var Server */
	protected $server;

	/**
	 * Initializes the plugin and registers event handlers
	 *
	 * @param Server $server
	 * @return void
	 */
	public function initialize(Server $server) {
		$this->server = $server;
		$this->server->on('afterMethod:REPORT', [$this, 'httpReport'], 90);
	}

	/**
	 * Intercepts REPORT requests
	 *
	 * @param RequestInterface $request
	 * @param ResponseInterface $response
	 * @return bool
	 */
	public function httpReport(RequestInterface $request, ResponseInterface $response) {
		$queryParams = $request->getQueryParameters();
		if (!array_key_exists('export', $queryParams)) {
			return;
		}

		// Only handling xml
		$contentType = $response->getHeader('Content-Type');
		if (strpos($contentType, 'application/xml') === false && strpos($contentType, 'text/xml') === false) {
			return;
		}

		$this->server->transactionType = 'vcf-multi-get-intercept-and-export';

		// Get the xml response
		$responseBody = $response->getBodyAsString();
		$responseXml  = $this->server->xml->parse($responseBody);

		// Reduce the vcards into one string
		$output = array_reduce($responseXml->getResponses(), function ($vcf, $card) {
			$vcf .= $card->getResponseProperties()[200]['{urn:ietf:params:xml:ns:carddav}address-data'];
			return $vcf;
		}, '');

		// Build and override the response
		$filename = 'vcfexport-' . date('Y-m-d') . '.vcf';
		$response->setHeader('Content-Disposition', 'attachment; filename="' . $filename . '"');
		$response->setHeader('Content-Type', 'text/vcard');

		$response->setStatus(200);
		$response->setBody($output);

		return true;
	}

	/**
	 * Returns a plugin name.
	 *
	 * Using this name other plugins will be able to access other plugins
	 * using \Sabre\DAV\Server::getPlugin
	 *
	 * @return string
	 */
	public function getPluginName() {
		return 'vcf-multi-get-intercept-and-export';
	}

	/**
	 * Returns a bunch of meta-data about the plugin.
	 *
	 * Providing this information is optional, and is mainly displayed by the
	 * Browser plugin.
	 *
	 * The description key in the returned array may contain html and will not
	 * be sanitized.
	 *
	 * @return array
	 */
	public function getPluginInfo() {
		return [
			'name'        => $this->getPluginName(),
			'description' => 'Intercept a multi-get request and return a single vcf file instead.'
		];
	}
}
