<?php # $Id$

/************
  TODO:

  - Perform Serendipity version checks to only install plugins available for version
  - Allow fetching files from mirrors / different locations - don't use ViewCVS hack (revision 1.999 dumbness)

 ***********/


if (IN_serendipity !== true) {
    die ("Don't hack!");
}

// Probe for a language include with constants. Still include defines later on, if some constants were missing
$probelang = dirname(__FILE__) . '/' . $serendipity['charset'] . 'lang_' . $serendipity['lang'] . '.inc.php';
if (file_exists($probelang)) {
    include $probelang;
}

include dirname(__FILE__) . '/lang_en.inc.php';

class serendipity_event_spartacus extends serendipity_event
{
    var $title = PLUGIN_EVENT_SPARTACUS_NAME;
    var $purgeCache = false;

    function microtime_float() {
        list($usec, $sec) = explode(" ", microtime());
        return ((float)$usec + (float)$sec);
    }

    function introspect(&$propbag)
    {
        global $serendipity;

        $propbag->add('name',          PLUGIN_EVENT_SPARTACUS_NAME);
        $propbag->add('description',   PLUGIN_EVENT_SPARTACUS_DESC);
        $propbag->add('stackable',     false);
        $propbag->add('author',        'Garvin Hicking');
        $propbag->add('version',       '2.9');
        $propbag->add('requirements',  array(
            'serendipity' => '0.9',
            'smarty'      => '2.6.7',
            'php'         => '4.1.0'
        ));
        $propbag->add('event_hooks',    array(
            'backend_plugins_fetchlist'          => true,
            'backend_plugins_fetchplugin'        => true,

            'backend_templates_fetchlist'        => true,
            'backend_templates_fetchtemplate'    => true,

            'backend_pluginlisting_header'         => true,
            'backend_pluginlisting_header_upgrade' => true
        ));
        $propbag->add('groups', array('BACKEND_FEATURES'));
        $propbag->add('configuration', array('mirror_xml', 'mirror_files', 'chown', 'chmod_files', 'chmod_dir'));
    }

    function generate_content(&$title) {
        $title = $this->title;
    }

    function cleanup() {
        global $serendipity;

        // Purge DB cache
        serendipity_db_query("DELETE FROM {$serendipity['dbPrefix']}pluginlist");
        serendipity_db_query("DELETE FROM {$serendipity['dbPrefix']}plugincategories");

        // Purge cached XML files.
        $files = serendipity_traversePath($serendipity['serendipityPath'] . PATH_SMARTY_COMPILE, '', false, '/package_.+\.xml$/');

        if (!is_array($files)) {
            return false;
        }

        foreach ($files as $file) {
            printf(DELETING_FILE . '<br />', $file['name']);
            @unlink($serendipity['serendipityPath'] . PATH_SMARTY_COMPILE . '/' . $file['name']);
        }
    }

    function &getMirrors($type = 'xml', $loc = false) {
        static $mirror = array(
            'xml' => array(
                'Netmirror.org',
                's9y.org'
            ),

            'files' => array(
                'Netmirror.org',
                'SourceForge.net',
                's9y.org',
                'BerliOS.de'
            )
        );

        static $http = array(
            'xml' => array(
                'http://netmirror.org/mirror/serendipity/',
                'http://s9y.org/mirror/'
            ),

            'files' => array(
                'http://netmirror.org/mirror/serendipity/',
                'http://php-blog.cvs.sourceforge.net/*checkout*/php-blog/',
                'http://s9y.org/mirror/',
                'http://svn.berlios.de/viewcvs/serendipity/'
            )
        );

        if ($loc) {
            return $http[$type];
        } else {
            return $mirror[$type];
        }
    }

    function introspect_config_item($name, &$propbag) {
        global $serendipity;

        switch($name) {
            case 'chmod_files':
                $propbag->add('type',        'string');
                $propbag->add('name',        PLUGIN_EVENT_SPARTACUS_CHMOD);
                $propbag->add('description', PLUGIN_EVENT_SPARTACUS_CHMOD_DESC);
                $propbag->add('default',     '');
                break;

            case 'chmod_dir':
                $propbag->add('type',        'string');
                $propbag->add('name',        PLUGIN_EVENT_SPARTACUS_CHMOD_DIR);
                $propbag->add('description', PLUGIN_EVENT_SPARTACUS_CHMOD_DIR_DESC);
                $propbag->add('default',     '');
                break;

            case 'chown':
                $propbag->add('type',        'string');
                $propbag->add('name',        PLUGIN_EVENT_SPARTACUS_CHOWN);
                $propbag->add('description', PLUGIN_EVENT_SPARTACUS_CHOWN_DESC);
                $propbag->add('default',     '');
                break;

            case 'mirror_xml':
                $propbag->add('type',        'select');
                $propbag->add('name',        PLUGIN_EVENT_SPARTACUS_MIRROR_XML);
                $propbag->add('description', PLUGIN_EVENT_SPARTACUS_MIRROR_DESC);
                $propbag->add('select_values', $this->getMirrors('xml'));
                $propbag->add('default',     0);
                break;

            case 'mirror_files':
                $propbag->add('type',        'select');
                $propbag->add('name',        PLUGIN_EVENT_SPARTACUS_MIRROR_FILES);
                $propbag->add('description', PLUGIN_EVENT_SPARTACUS_MIRROR_DESC);
                $propbag->add('select_values', $this->getMirrors('files'));
                $propbag->add('default',     0);
                break;

            default:
                return false;
        }
        return true;
    }

    function GetChildren(&$vals, &$i) {
        $children = array();
        $cnt = sizeof($vals);
        while (++$i < $cnt) {
            // compare type
            switch ($vals[$i]['type']) {
                case 'cdata':
                    $children[] = $vals[$i]['value'];
                    break;

                case 'complete':
                    $children[] = array(
                        'tag'        => $vals[$i]['tag'],
                        'attributes' => $vals[$i]['attributes'],
                        'value'      => $vals[$i]['value']
                    );
                    break;

                case 'open':
                    $children[] = array(
                        'tag'        => $vals[$i]['tag'],
                        'attributes' => $vals[$i]['attributes'],
                        'value'      => $vals[$i]['value'],
                        'children'   => $this->GetChildren($vals, $i)
                    );
                    break;

                case 'close':
                    return $children;
            }
        }
    }

    // Create recursive directories; begins at serendipity plugin root folder level
    function rmkdir($dir, $sub = 'plugins') {
        global $serendipity;

        $spaths = explode('/', $serendipity['serendipityPath'] . $sub . '/');
        $paths  = explode('/', $dir);

        $stack  = '';
        foreach($paths AS $pathid => $path) {
            $stack .= $path . '/';

            if ($spaths[$pathid] == $path) {
                continue;
            }

            if (!is_dir($stack) && !mkdir($stack)) {
                return false;
            } else {
                $this->fileperm($stack, true);
            }
        }

        return true;
    }

    // Apply file permission settings.
    function fileperm($stack, $is_dir) {
        $chmod_dir   = intval($this->get_config('chmod_dir'), 8);
        $chmod_files = intval($this->get_config('chmod_files'), 8);
        $chown       = $this->get_config('chown');

        if ($is_dir && !empty($chmod_dir) && function_exists('chmod')) {
            @chmod($stack, $chmod_dir); // Always ensure directory traversal.
        }

        if (!$is_dir && !empty($chmod_files) && function_exists('chmod')) {
            @chmod($stack, $chmod_files); // Always ensure directory traversal.
        }

        if (!empty($chown) && function_exists('chown')) {
            $own = explode('.', $chown);
            if (isset($own[1])) {
                @chgrp($stack, $own[1]);
            }
            @chown($stack, $own[0]);
        }


        return true;
    }

    function &fetchfile($url, $target, $cacheTimeout = 0, $decode_utf8 = false, $sub = 'plugins') {
        static $error = false;

        // Fix double URL strings.
        $url = str_replace('http:/', 'http://', str_replace('//', '/', $url));

        // --JAM: Get the URL's IP in the most error-free way possible
        $url_parts = @parse_url($url);
        $url_hostname = 'localhost';
        if (is_array($url_parts)) {
            $url_hostname = $url_parts['host'];
        }
        $url_ip = gethostbyname($url_hostname);

        printf(PLUGIN_EVENT_SPARTACUS_FETCHING, '<a href="' . $url . '">' . basename($url) . '</a>');
        echo '<br />';

        if (file_exists($target) && filesize($target) > 0 && filemtime($target) >= (time()-$cacheTimeout)) {
            $data = file_get_contents($target);
            printf(PLUGIN_EVENT_SPARTACUS_FETCHED_BYTES_CACHE, strlen($data), $target);
            echo '<br />';
        } else {
            require_once S9Y_PEAR_PATH . 'HTTP/Request.php';
            $options = array();
            serendipity_plugin_api::hook_event('backend_http_request', $options, 'spartacus');
            serendipity_request_start();
            $req = &new HTTP_Request($url, $options);

            if (PEAR::isError($req->sendRequest()) || $req->getResponseCode() != '200') {
                $resolved_url = $url . ' (at IP ' . $url_ip . ')';
                printf(PLUGIN_EVENT_SPARTACUS_FETCHERROR, $resolved_url);
                //--JAM: START FIREWALL DETECTION
                if ($req->getResponseCode()) {
                    printf(PLUGIN_EVENT_SPARTACUS_REPOSITORY_ERROR, $req->getResponseCode());
                }
                $check_health = true;
                if (function_exists('curl_init')) {
                    echo PLUGIN_EVENT_SPARTACUS_TRYCURL . "\n";
                    $curl_handle=curl_init();
                    curl_setopt($curl_handle, CURLOPT_URL, $url);
                    curl_setopt($curl_handle, CURLOPT_HEADER, 0);
                    $data = curl_exec($curl_handle);
                    curl_close($curl_handle);
                    if ($curl_result) {
                        $check_health = false;
                    } else {
                        echo PLUGIN_EVENT_SPARTACUS_CURLFAIL . "\n";
                    }
                }
            }
            if ($check_health) {
                echo PLUGIN_EVENT_SPARTACUS_HEALTHCHECK . "\n";
                /*--JAM: Useful for later, when we have a health monitor for SPARTACUS
                $propbag = new serendipity_property_bag;
                $this->introspect($propbag);
                $health_url = 'http://spartacus.s9y.org/spartacus_health.php?version=' . $propbag->get('version');
                */
                $health_url = $url;
                $matches = array();
                preg_match('#http://[^/]*/#', $url, $matches);
                if ($matches[0]) {
                    $health_url = $matches[0];
                }
                $health_options = $options;
                serendipity_plugin_api::hook_event('backend_http_request', $health_options, 'spartacus_health');
                $health_req = &new HTTP_Request($health_url, $health_options);
                $health_result = $health_req->sendRequest();
                if (PEAR::isError($health_result))
                {
                    $fp = @fsockopen('www.google.com', 80, $errno, $errstr);
                    if (!$fp) {
                        printf(PLUGIN_EVENT_SPARTACUS_HEALTHBLOCKED, $errno, $errstr);
                    } else {
                        echo PLUGIN_EVENT_SPARTACUS_HEALTHDOWN;
                        printf(PLUGIN_EVENT_SPARTACUS_HEALTHLINK, $health_url);
                        fclose($fp);
                    }
                } else if ($health_req->getResponseCode() != '200') {
                    printf(PLUGIN_EVENT_SPARTACUS_HEALTHERROR, $health_req->getResponseCode());
                    printf(PLUGIN_EVENT_SPARTACUS_HEALTHLINK, $health_url);
                } else {
                    //--JAM: Parse response and display it.
                }
                //--JAM: END FIREWALL DETECTION
                if (file_exists($target) && filesize($target) > 0) {
                    $data = file_get_contents($target);
                    printf(PLUGIN_EVENT_SPARTACUS_FETCHED_BYTES_CACHE, strlen($data), $target);
                    echo '<br />';
                }
            } else {
                // Fetch file
                if (!$data) {
                    $data = $req->getResponseBody();
                }
                printf(PLUGIN_EVENT_SPARTACUS_FETCHED_BYTES_URL, strlen($data), $target);
                echo '<br />';
                $tdir = dirname($target);
                if (!is_dir($tdir) && !$this->rmkdir($tdir, $sub)) {
                    printf(FILE_WRITE_ERROR, $tdir);
                    echo '<br />';
                    return $error;
                }

                $fp = @fopen($target, 'w');

                if (!$fp) {
                    printf(FILE_WRITE_ERROR, $target);
                    echo '<br />';
                    return $error;
                }

                if ($decode_utf8) {
                    $data = str_replace('<?xml version="1.0" encoding="UTF-8" ?>', '<?xml version="1.0" encoding="' . LANG_CHARSET . '" ?>', $data);
                    $this->decode($data, true);
                }

                fwrite($fp, $data);
                fclose($fp);

                $this->fileperm($target, false);

                echo PLUGIN_EVENT_SPARTACUS_FETCHED_DONE;
                echo '<br />';
                $this->purgeCache = true;
            }
            serendipity_request_end();
        }

        return $data;
    }

    function decode(&$data, $force = false) {
        // xml_parser_* functions to recoding from ISO-8859-1/UTF-8
        if ($force === false && (LANG_CHARSET == 'ISO-8859-1' || LANG_CHARSET == 'UTF-8')) {
            return true;
        }

        switch (strtolower(LANG_CHARSET)) {
            case 'utf-8':
                // The XML file is UTF-8 format. No changes needed.
                break;

            case 'iso-8859-1':
                $data = utf8_decode($data);
                break;

            default:
                if (function_exists('iconv')) {
                    $data = iconv('UTF-8', LANG_CHARSET, $data);
                } elseif (function_exists('recode')) {
                    $data = recode('utf-8..' . LANG_CHARSET, $data);
                }
                break;
        }
    }

    function &fetchOnline($type, $no_cache = false) {
        global $serendipity;

        switch($type) {
            // Sanitize to not fetch other URLs
            default:
            case 'event':
                $url_type = 'event';
                $i18n     = true;
                break;

            case 'sidebar':
                $url_type = 'sidebar';
                $i18n     = true;
                break;

            case 'template':
                $url_type = 'template';
                $i18n     = false;
                break;
        }

        if (!$i18n) {
            $lang = '';
        } elseif (isset($serendipity['languages'][$serendipity['lang']])) {
            $lang = '_' . $serendipity['lang'];
        } else {
            $lang = '_en';
        }

        $mirrors = $this->getMirrors('xml', true);
        $mirror  = $mirrors[$this->get_config('mirror_xml', 0)];

        $url    = $mirror . '/package_' . $url_type .  $lang . '.xml';
        $cacheTimeout = 60*60*12; // XML file is cached for half a day
        $target = $serendipity['serendipityPath'] . PATH_SMARTY_COMPILE . '/package_' . $url_type . $lang . '.xml';

        $xml = $this->fetchfile($url, $target, $cacheTimeout, true);
        echo '<br /><br />';

        $new_crc  = md5($xml);
        $last_crc = $this->get_config('last_crc_' . $url_type);

        if (!$no_cache && !$this->purgeCache && $last_crc == $new_crc) {
            $out = 'cached';
            return $out;
        }

        // XML functions
        $xml_string = '<?xml version="1.0" encoding="UTF-8" ?>';
        if (preg_match('@(<\?xml.+\?>)@imsU', $xml, $xml_head)) {
            $xml_string = $xml_head[1];
        }

        $encoding = 'UTF-8';
        if (preg_match('@encoding="([^"]+)"@', $xml_string, $xml_encoding)) {
            $encoding = $xml_encoding[1];
        }

        preg_match_all('@(<package version="[^"]+">.*</package>)@imsU', $xml, $xml_matches);
        if (!is_array($xml_matches)) {
            $out = 'cached';
            return $out;
        }

        $i = 0;
        $tree = array();
        $tree[$i] = array(
            'tag'        => 'packages',
            'attributes' => '',
            'value'      => '',
            'children'   => array()
        );

        foreach($xml_matches[0] as $xml_index => $xml_package) {
            $i = 0;

            switch(strtolower($encoding)) {
                case 'iso-8859-1':
                case 'utf-8':
                    $p = xml_parser_create($encoding);
                    break;

                default:
                    $p = xml_parser_create('');
            }

            xml_parser_set_option($p, XML_OPTION_CASE_FOLDING, 0);
            @xml_parser_set_option($this->parser, XML_OPTION_TARGET_ENCODING, LANG_CHARSET);
            $xml_package = $xml_string . "\n" . $xml_package;
            xml_parse_into_struct($p, $xml_package, $vals);
            xml_parser_free($p);
            $tree[0]['children'][] = array(
                'tag'        => $vals[$i]['tag'],
                'attributes' => $vals[$i]['attributes'],
                'value'      => $vals[$i]['value'],
                'children'   => $this->GetChildren($vals, $i)
            );
            unset($vals);
        }

        $this->set_config('last_crc_' . $url_type, $new_crc);

        return $tree;
    }

    function &getCachedPlugins(&$plugins, $type) {
        global $serendipity;
        static $pluginlist = null;

        if ($pluginlist === null) {
            $pluginlist = array();
            $data = serendipity_db_query("SELECT p.*,
                                                 pc.category
                                            FROM {$serendipity['dbPrefix']}pluginlist AS p
                                 LEFT OUTER JOIN {$serendipity['dbPrefix']}plugincategories AS pc
                                              ON pc.class_name = p.class_name
                                           WHERE p.pluginlocation = 'Spartacus' AND
                                                 p.plugintype     = '" . serendipity_db_escape_string($type) . "'");

            if (is_array($data)) {
                foreach($data AS $p) {
                    $p['stackable']    = serendipity_db_bool($p['stackable']);
                    $p['requirements'] = unserialize($p['requirements']);
                    $this->checkPlugin($p, $plugins, $p['plugintype']);

                    if (!isset($pluginlist[$p['plugin_file']])) {
                        $pluginlist[$p['plugin_file']] = $p;
                    }

                    $pluginlist[$p['plugin_file']]['groups'][] = $p['category'];
                }
            }
        }

        return $pluginlist;
    }

    function checkPlugin(&$data, &$plugins, $type) {
        $installable = true;
        $upgradeLink = '';
        if (in_array($data['class_name'], $plugins)) {
            $infoplugin =& serendipity_plugin_api::load_plugin($data['class_name']);
            if (is_object($infoplugin)) {
                $bag    = new serendipity_property_bag;
                $infoplugin->introspect($bag);
                if ($bag->get('version') == $data['version']) {
                    $installable = false;
                } elseif (version_compare($bag->get('version'), $data['version'], '<')) {
                    $data['upgradable']      = true;
                    $data['upgrade_version'] = $data['version'];
                    $data['version']         = $bag->get('version');
                    $upgradeLink             = '&amp;serendipity[spartacus_upgrade]=true';
                }
            }
        }

        $data['installable']     = $installable;
        $data['pluginPath']      = 'online_repository';
        $data['pluginlocation']  = 'Spartacus';
        $data['plugintype']      = $type;
        $data['customURI']       = '&amp;serendipity[spartacus_fetch]=' . $type . $upgradeLink;

        return true;
    }

    function &buildList(&$tree, $type) {
        $plugins = serendipity_plugin_api::get_installed_plugins();

        if ($tree === 'cached') {
            return $this->getCachedPlugins($plugins, $type);
        }

        $pluginstack = array();
        $i = 0;

        $this->checkArray($tree);

        foreach($tree[0]['children'] AS $idx => $subtree) {
            if ($subtree['tag'] == 'package') {
                $i++;

                foreach($subtree['children'] AS $child => $childtree) {
                    switch($childtree['tag']) {
                        case 'name':
                            $pluginstack[$i]['plugin_class']    =
                                $pluginstack[$i]['plugin_file'] =
                                $pluginstack[$i]['class_name']  =
                                $pluginstack[$i]['true_name']   = $childtree['value'];
                            break;

                        case 'summary':
                            $pluginstack[$i]['name']         = $childtree['value'];
                            break;

                        case 'groups':
                            $pluginstack[$i]['groups']       = explode(',', $childtree['value']);
                            break;

                        case 'description':
                            $pluginstack[$i]['description']  = $childtree['value'];
                            break;

                        case 'release':
                            $pluginstack[$i]['version']      = $childtree['children'][0]['value'];

                            $pluginstack[$i]['requirements'] = array(
                                'serendipity' => '',
                                'php'         => '',
                                'smarty'      => ''
                            );

                            foreach((array)$childtree['children'] AS $relInfo) {
                                if ($relInfo['tag'] == 'requirements:s9yVersion') {
                                    $pluginstack[$i]['requirements']['serendipity'] = $relInfo['value'];
                                }
                            }
                            break;

                        case 'maintainers':
                            $pluginstack[$i]['author']       = $childtree['children'][0]['children'][0]['value']; // I dig my PHP arrays ;-)
                            break;
                    }
                }

                $this->checkPlugin($pluginstack[$i], $plugins, $type);

                serendipity_plugin_api::setPluginInfo($pluginstack[$i], $pluginstack[$i]['plugin_file'], $i, $i, 'Spartacus');
                // Remove the temporary $i reference, as the array should be associative
                $plugname = $pluginstack[$i]['true_name'];
                $pluginstack[$plugname] = $pluginstack[$i];
                unset($pluginstack[$i]);
            }
        }

        return $pluginstack;
    }

    function checkArray(&$tree) {
        if (!is_array($tree) || !is_array($tree[0]['children'])) {
           echo "DEBUG: The XML file could not be successfully parsed. Download or caching error. Please try again later or switch your XML/File mirror location. You can also try to go to the plugin configuration of the Spartacus Plugin and simply click on 'Save' - this will purge all cached XML files and try to download it again.<div style='display: none'>" . print_r($tree, true) . "</div><br />\n";
        }
    }

    function &buildTemplateList(&$tree) {
        $pluginstack = array();
        $i = 0;

        $mirrors = $this->getMirrors('files', true);
        $mirror  = $mirrors[$this->get_config('mirror_files', 0)];

        $this->checkArray($tree);

        foreach($tree[0]['children'] AS $idx => $subtree) {
            if ($subtree['tag'] == 'package') {
                $i++;

                foreach($subtree['children'] AS $child => $childtree) {
                    switch($childtree['tag']) {
                        case 'name':
                            $pluginstack[$i]['name']         = $childtree['value'];
                            break;

                        case 'summary':
                            $pluginstack[$i]['summary']      = $childtree['value'];
                            break;

                        case 'template':
                            $pluginstack[$i]['template']  = $childtree['value'];
                            break;

                        case 'description':
                            $pluginstack[$i]['description']  = $childtree['value'];
                            break;

                        case 'release':
                            $pluginstack[$i]['version']      = $childtree['children'][0]['value'];

                            $pluginstack[$i]['requirements'] = array(
                                'serendipity' => '',
                                'php'         => '',
                                'smarty'      => ''
                            );

                            foreach((array)$childtree['children'] AS $relInfo) {
                                if ($relInfo['tag'] == 'requirements:s9yVersion') {
                                    $pluginstack[$i]['requirements']['serendipity'] = $relInfo['value'];
                                }

                                if ($relInfo['tag'] == 'date') {
                                    $pluginstack[$i]['date'] = $relInfo['value'];
                                }

                            }

                            $pluginstack[$i]['require serendipity'] = $pluginstack[$i]['requirements']['serendipity'];
                            break;

                        case 'maintainers':
                            $pluginstack[$i]['author']       = $childtree['children'][0]['children'][0]['value']; // I dig my PHP arrays ;-)
                            break;
                    }
                }

                $plugname = $pluginstack[$i]['template'];
                $pluginstack[$i]['previewURL'] = $mirror . '/additional_themes/' . $plugname . '/preview.png?rev=1.9999';
                $pluginstack[$i]['customURI']  = '&amp;serendipity[spartacus_fetch]=' . $plugname;
                $pluginstack[$i]['customIcon'] = '_spartacus';

                // Remove the temporary $i reference, as the array should be associative
                $pluginstack[$plugname] = $pluginstack[$i];
                unset($pluginstack[$i]);
            }
        }

        return $pluginstack;
    }

    function download(&$tree, $plugin_to_install, $sub = 'plugins') {
        global $serendipity;

        switch($sub) {
            case 'plugins':
            default:
                $sfloc = 'additional_plugins';
                break;

            case 'templates':
                $sfloc = 'additional_themes';
                break;
        }

        $pdir = $serendipity['serendipityPath'] . '/' . $sub . '/';
        if (!is_writable($pdir)) {
            printf(DIRECTORY_WRITE_ERROR, $pdir);
            echo '<br />';
            return false;
        }

        $files = array();
        $found = false;

        $this->checkArray($tree);

        foreach($tree[0]['children'] AS $idx => $subtree) {
            if ($subtree['tag'] != 'package') {
                continue;
            }

            foreach($subtree['children'] AS $child => $childtree) {
                if ($sub == 'templates' && $childtree['tag'] == 'template' && $childtree['value'] == $plugin_to_install) {
                    $found = true;
                } elseif ($sub == 'plugins' && $childtree['tag'] == 'name' && $childtree['value'] == $plugin_to_install) {
                    $found = true;
                }

                if (!$found || $childtree['tag'] != 'release') {
                    continue;
                }

                foreach($childtree['children'] AS $child2 => $childtree2) {
                    if ($childtree2['tag'] != 'serendipityFilelist') {
                        continue;
                    }

                    foreach($childtree2['children'] AS $idx => $_files) {
                        if ($_files['tag'] == 'file' && !empty($_files['value'])) {
                            $files[] = $_files['value'];
                        }
                    }
                }

                $found = false;
            }
        }

        if (count($files) == 0) {
            echo "DEBUG: ERROR: XML tree did not contain requested plugin:<br />\n";
            print_r($tree);
        }

        $mirrors = $this->getMirrors('files', true);
        $mirror  = $mirrors[$this->get_config('mirror_files', 0)];

        foreach($files AS $file) {
            $url    = $mirror . '/' . $sfloc . '/' . $file . '?rev=1.9999';
            $target = $pdir . $file;
            @mkdir($pdir . $plugin_to_install);
            $this->fileperm($pdir . $plugin_to_install, true);
            $this->fetchfile($url, $target);
            if (!isset($baseDir)) {
                $baseDirs = explode('/', $file);
                $baseDir  = $baseDirs[0];
            }
        }

        if (isset($baseDir)) {
            return $baseDir;
        }
    }

    function event_hook($event, &$bag, &$eventData) {
        global $serendipity;

        $hooks = &$bag->get('event_hooks');

        if (isset($hooks[$event])) {
            switch($event) {
                case 'backend_pluginlisting_header':
                    echo '<br /><div id="upgrade_notice" class="serendipityAdminMsgSuccess">';
                    echo '<a href="?serendipity[adminModule]=plugins&amp;serendipity[adminAction]=addnew&amp;serendipity[only_group]=UPGRADE" class="serendipityIconLink upgrade_sidebar"><img src="' . serendipity_getTemplateFile('admin/img/upgrade_now.png') . '" style="border: 0px none ; vertical-align: middle; display: inline;" alt="" />' . PLUGIN_EVENT_SPARTACUS_CHECK_SIDEBAR . '</a> &nbsp; ';
                    echo '<a href="?serendipity[adminModule]=plugins&amp;serendipity[adminAction]=addnew&amp;serendipity[only_group]=UPGRADE&amp;serendipity[type]=event" class="serendipityIconLink upgrade_event"><img src="' . serendipity_getTemplateFile('admin/img/upgrade_now.png') . '" style="border: 0px none ; vertical-align: middle; display: inline;" alt="" />' . PLUGIN_EVENT_SPARTACUS_CHECK_EVENT . '</a> ';
                    echo '</div>';

                    return true;
                    break;

                case 'backend_pluginlisting_header_upgrade':
                    echo '<em>' . PLUGIN_EVENT_SPARTACUS_CHECK_HINT . '</em><br />';

                    return true;
                    break;

                case 'backend_templates_fetchlist':
                    $eventData = $this->buildTemplateList($this->fetchOnline('template', true), 'template');

                    return true;
                    break;

                case 'backend_templates_fetchtemplate':
                    if (!empty($eventData['GET']['spartacus_fetch'])) {
                        $this->download(
                            $this->fetchOnline('template', true),
                            $eventData['GET']['theme'],
                            'templates'
                        );
                    }

                    return false;
                    break;

                case 'backend_plugins_fetchlist':
                    $type = (isset($serendipity['GET']['type']) ? $serendipity['GET']['type'] : 'sidebar');

                    $eventData = array(
                       'pluginstack' => $this->buildList($this->fetchOnline($type), $type),
                       'errorstack'  => array(),
                       'upgradeURI'  => '&amp;serendipity[spartacus_upgrade]=true',
                       'baseURI'     => '&amp;serendipity[spartacus_fetch]=' . $type
                    );

                    return true;
                    break;

                case 'backend_plugins_fetchplugin':
                    if (!empty($eventData['GET']['spartacus_fetch'])) {
                        $baseDir = $this->download($this->fetchOnline($eventData['GET']['spartacus_fetch'], true), $eventData['GET']['install_plugin']);

                        if ($baseDir === false) {
                            $eventData['install'] = false;
                        } elseif (!empty($baseDir)) {
                            $eventData['GET']['pluginPath'] = $baseDir;
                        } else {
                            $eventData['GET']['pluginPath'] = $eventData['GET']['install_plugin'];
                        }

                        if ($eventData['GET']['spartacus_upgrade']) {
                            $eventData['install'] = false;
                        }
                    }

                    return false;
                    break;

                default:
                    return false;
                    break;
            }
        } else {
            return false;
        }
    }
}

/* vim: set sts=4 ts=4 expandtab : */