<?php
/**
 * DokuWiki Plugin extension (Helper Component)
 *
 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
 * @author  Michael Hamann <michael@content-space.de>
 */

define('EXTENSION_REPOSITORY_API', 'http://localhost/dokuwiki/lib/plugins/pluginrepo/api.php');

if (!defined('EXTENSION_REPOSITORY_API_ENDPOINT'))
    define('EXTENSION_REPOSITORY_API', 'http://www.dokuwiki.org/lib/plugins/pluginrepo/api.php');

// must be run within Dokuwiki
if(!defined('DOKU_INC')) die();

/**
 * Class helper_plugin_extension_repository provides access to the extension repository on dokuwiki.org
 */
class helper_plugin_extension_repository extends DokuWiki_Plugin {
    private $loaded_extensions = array();
    private $has_access = null;
    /**
     * Initialize the repository (cache), fetches data for all installed plugins
     */
    public function init() {
        /* @var Doku_Plugin_Controller $plugin_controller */
        global $plugin_controller;
        if ($this->hasAccess()) {
            $list = $plugin_controller->getList('', true);
            $request_data = array('fmt' => 'php');
            $request_needed = false;
            foreach ($list as $name) {
                $cache = new cache('##extension_manager##'.$name, 'repo');
                $result = null;
                if (!isset($this->loaded_extensions[$name]) && $this->hasAccess() && !$cache->useCache(array('age' => 3600 * 24))) {
                    $this->loaded_extensions[$name] = true;
                    $request_data['ext'][] = $name;
                    $request_needed = true;
                }
            }

            if ($request_needed) {
                $httpclient = new DokuHTTPClient();
                $data = $httpclient->post(EXTENSION_REPOSITORY_API, $request_data);
                if ($data !== false) {
                    $extensions = unserialize($data);
                    foreach ($extensions as $extension) {
                        $cache = new cache('##extension_manager##'.$extension['plugin'], 'repo');
                        $cache->storeCache(serialize($extension));
                    }
                } else {
                    $this->has_access = false;
                }
            }
        }
    }

    /**
     * If repository access is available
     *
     * @return bool If repository access is available
     */
    public function hasAccess() {
        if ($this->has_access === null) {
            $cache = new cache('##extension_manager###hasAccess', 'repo');
            $result = null;
            if (!$cache->useCache(array('age' => 3600 * 24, 'purge'=>1))) {
                $httpclient = new DokuHTTPClient();
                $httpclient->timeout = 5;
                $data = $httpclient->get(EXTENSION_REPOSITORY_API.'?cmd=ping');
                if ($data !== false) {
                    $this->has_access = true;
                    $cache->storeCache(1);
                } else {
                    $this->has_access = false;
                    $cache->storeCache(0);
                }
            } else {
                $this->has_access = ($cache->retrieveCache(false) == 1);
            }
        }
        return $this->has_access;
    }

    /**
     * Get the remote data of an individual plugin or template
     *
     * @param string $name  The plugin name to get the data for, template names need to be prefix by 'template:'
     * @return array The data or null if nothing was found (possibly no repository access)
     */
    public function getData($name) {
        $cache = new cache('##extension_manager##'.$name, 'repo');
        $result = null;
        if (!isset($this->loaded_extensions[$name]) && $this->hasAccess() && !$cache->useCache(array('age' => 3600 * 24))) {
            $this->loaded_extensions[$name] = true;
            $httpclient = new DokuHTTPClient();
            $data = $httpclient->get(EXTENSION_REPOSITORY_API.'?fmt=php&ext[]='.urlencode($name));
            if ($data !== false) {
                $result = unserialize($data);
                $cache->storeCache(serialize($result[0]));
                return $result[0];
            } else {
                $this->has_access = false;
            }
        }
        if (file_exists($cache->cache)) {
            return unserialize($cache->retrieveCache(false));
        }
        return array();
    }
}

// vim:ts=4:sw=4:et: