additional_plugins/serendipity_event_geo_json/serendipity_event_geo_json.php

<?php

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

@serendipity_plugin_api::load_language(dirname(__FILE__));

class serendipity_event_geo_json extends serendipity_event
{
    function introspect(&$propbag)
    {
        $propbag->add('name',          PLUGIN_EVENT_GEO_JSON_NAME);
        $propbag->add('description',   PLUGIN_EVENT_GEO_JSON_DESCRIPTION);
        $propbag->add('copyright', 'GPL');
        $propbag->add('configuration', array('content'));
        $propbag->add('event_hooks', array('frontend_header' => true));
        $propbag->add('author', 'Martin Sewelies');
        $propbag->add('version', '0.1');
        $propbag->add('requirements', array('serendipity' => '2.3'));
        $propbag->add('stackable', false);
        $propbag->add('groups', array('FRONTEND_FEATURES'));
    }

    function generate_content(&$title)
    {
        $title = PLUGIN_EVENT_GEO_JSON_NAME;
    }

    function event_hook($event, &$bag, &$eventData, $addData = null)
    {
        global $serendipity;
        if ($event == 'frontend_header') {
            $tt = serendipity_db_query(
                "SELECT e.title, p.permalink, e.timestamp, LENGTH(e.body) AS size, a.realname, e2.value AS lat, e1.value AS lng
                FROM {$serendipity['dbPrefix']}entries e
                JOIN {$serendipity['dbPrefix']}entryproperties e1 ON (e1.entryid = e.id AND e1.property='geo_long')
                JOIN {$serendipity['dbPrefix']}entryproperties e2 ON (e2.entryid = e.id AND e2.property='geo_lat')
                LEFT JOIN {$serendipity['dbPrefix']}permalinks p ON (p.entry_id = e.id AND p.type='entry')
                LEFT JOIN {$serendipity['dbPrefix']}authors a ON (a.authorid = e.authorid)
                WHERE e.isdraft = 'false'
                ORDER BY p.permalink"
            );

            $entries = [];
            if (is_array($tt)) {
                foreach ($tt as $t) {
                    $entries[] = [
                        'title' => $t['title'],
                        'url' => $serendipity['serendipityHTTPPath'].$t['permalink'],
                        'date' => (int)$t['timestamp'],
                        'size' => (int)$t['size'],
                        'author' => $t['realname'],
                        'pos' => [(double)$t['lat'], (double)$t['lng']]
                    ];
                }
            }

            $tt = serendipity_db_query(
                "SELECT i.realname, i.path, IFNULL(m.value, i.date) AS date, i.size
                FROM {$serendipity['dbPrefix']}images i
                LEFT JOIN {$serendipity['dbPrefix']}mediaproperties m ON (
                    m.mediaid = i.id AND m.property='DATE' AND m.property_group = 'base_property' AND property_subgroup = ''
                )
                WHERE i.extension = 'gpx'
                ORDER BY i.path, i.realname"
            );

            $uploads = [];
            if (is_array($tt)) {
                foreach ($tt as $t) {
                    $uploads[] = [
                        'title' => $t['realname'],
                        'url' => $serendipity['serendipityHTTPPath'].$serendipity['uploadPath'].$t['path'].$t['realname'],
                        'date' => (int)$t['date'],
                        'size' => (int)$t['size']
                    ];
                }
            }

            $object = [
                'entries' => $entries,
                'uploads' => $uploads
            ];
            echo '    <script>const geo = '.json_encode($object, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES).';</script>'.PHP_EOL;
            //echo $this->get_config('content'); //TODO
        }
    }

    function introspect_config_item($name, &$propbag)
    {
        switch($name) {
            case 'content':
                $propbag->add('type',        'string');
                $propbag->add('name',        CONTENT);
                $propbag->add('description', THE_NUGGET);
                $propbag->add('default',     '');
                break;
            default:
                return false;
        }
        return true;
    }
}

?>