freifunkmeta/freifunkmeta.php

<?php
/**
Plugin Name: Freifunk Metadata Shortcodes
Plugin URI: http://mschuette.name/
Description: Defines shortcodes to display Freifunk metadata
Version: 0.3
Author: Martin Schuette
Author URI: http://mschuette.name/
*/

define('FF_META_DEFAULT_CACHETIME', 15);
define('FF_META_DEFAULT_DIR', 'https://raw.githubusercontent.com/freifunk/directory.api.freifunk.net/master/directory.json');
define('FF_META_DEFAULT_CITY', 'hamburg');

/**
 * class to fetch and cache data from external URLs
 */
class FF_Meta_Externaldata
{
    public function get($url) {
        /* gets metadata from URL, handles caching */
        $cachekey  = 'ff_metadata_'.hash('crc32', $url);
        $cachetime = get_option('ff_meta_cachetime', FF_META_DEFAULT_CACHETIME) * MINUTE_IN_SECONDS;

        // Caching
        if ( false === ( $data = get_transient($cachekey) ) ) {
            $json = wp_remote_retrieve_body(wp_remote_get($url));
            $data = json_decode ($json, $assoc = true);
            set_transient( $cachekey, $data, $cachetime );
        }
        return $data;
    }
}

/**
 * holds the community directory
 */
class FF_Directory
{
    private $directory;

    function __construct() {
        $this->directory = FF_Meta_Externaldata::get(FF_META_DEFAULT_DIR);
    }

    function get_url_by_city($city) {
        $val = $this->directory[$city];

        if (empty($val)) {
            return false;
        } else {
            return $val;
        }
    }
}

/**
 * OO interface to handle a single community/city
 */
class FF_Community
{
    public $name;
    public $street;
    public $zip;
    public $city;
    public $lon;
    public $lat;

    /**
     * Default constructor from metadata
     */
    function __construct($metadata) {
        $loc = $metadata['location'];
        $this->name   = (isset($loc['address']) && isset($loc['address']['Name']))    ? $loc['address']['Name']    : '';
        $this->street = (isset($loc['address']) && isset($loc['address']['Street']))  ? $loc['address']['Street']  : '';
        $this->zip    = (isset($loc['address']) && isset($loc['address']['Zipcode'])) ? $loc['address']['Zipcode'] : '';
        $this->city   = isset($loc['city']) ? $loc['city'] : '';
        $this->lon    = isset($loc['lon'])  ? $loc['lon']  : '';
        $this->lat    = isset($loc['lat'])  ? $loc['lat']  : '';
    }

    /**
     * Alternative constructor from city name
     */
    static function make_from_city($city) {
        // TODO: test
        if (false === ($url = $this->dir->get_url_by_city($city))) {
            return "<!-- FF Meta Error: cannot get directory.json, or no URL for '$city' -->\n";
        }
        if (false === ($metadata = FF_Meta_Externaldata::get($url))) {
            return "<!-- FF Meta Error: cannot get metadata from $url -->\n";
        }
        return new FF_Community($metadata);
    }

    function format_address() {
        if (empty($this->name) || empty($this->street) || empty($this->zip)) {
            return '';
        }
        // TODO: style address + map as single box
        // TODO: once it is "ready" package openlayers.js into the plugin (cf. http://docs.openlayers.org/library/deploying.html)
        // TODO: handle missing values (i.e. only name & city)
        return '<p>' . sprintf('%s<br/>%s<br/>%s %s', $this->name, $this->street, $this->zip, $this->city) . '</p>';
    }
}

/**
 * main class for whole plugin
 */
class FF_Meta
{
    private $dir;

    function __construct() {
        $this->dir = new FF_Directory();
    }

    function register_stuff() {
        if ( ! shortcode_exists('ff_state') ) {
            add_shortcode('ff_state',    array($this, 'shortcode_handler'));
        }
        if ( ! shortcode_exists('ff_services') ) {
            add_shortcode('ff_services', array($this, 'shortcode_handler'));
        }
        if ( ! shortcode_exists('ff_contact') ) {
            add_shortcode('ff_contact',  array($this, 'shortcode_handler'));
        }
        if ( ! shortcode_exists('ff_location') ) {
            add_shortcode('ff_location', array($this, 'shortcode_handler'));
        }

        add_action('admin_menu', array($this, 'admin_menu'));
        add_action('admin_init', array($this, 'admin_init'));
        register_uninstall_hook( __FILE__, array('ff_meta', 'uninstall_hook'));
    }

    function output_ff_state($citydata) {
        $state = $citydata['state'];
        return sprintf('%s', $state['nodes']);
    }

    function aux_get_all_locations() {
        // gather all location data
        if (false === ( $json_locs = get_transient("FF_metadata_json_locs") )) {
            $all_locs = array();
            $arr_select = array('lat' => 1, 'lon' => 1);
            foreach ($this->dir as $tmp_city => $url) {
                try {
                    $tmp_meta = FF_Meta_Externaldata::get($url);
                    if (!empty($tmp_meta['location'])) {
                        $tmp_loc = array_intersect_key($tmp_meta['location'], $arr_select);
                        $all_locs[$tmp_city] = $tmp_loc;
                    }
                } catch (Exception $e) {
                    // pass
                }
            }
            $json_locs = json_encode($all_locs);
            $cachetime = get_option('FF_meta_cachetime', FF_META_DEFAULT_CACHETIME) * MINUTE_IN_SECONDS;
            set_transient("FF_metadata_json_locs", $json_locs, $cachetime);
        }
        return $json_locs;
    }

    function output_ff_location($citydata) {
        // normal per-city code
        $loc = new FF_Community($citydata);

        $outstr = $loc->format_address();
        $json_locs = $this->aux_get_all_locations();

        if (!empty($loc_name) && !empty($loc_name)) {
            $icon_url = plugin_dir_url(__FILE__) . "freifunk_marker.png";
            $outstr .= <<<EOT
  <div id="mapdiv_$loc_city" style="width: 75%; height: 15em;"></div>

  <style type="text/css"> <!--
  /* There seems to be a bug in OpenLayers' style.css (?). Original bottom:4.5em is far too high. */
  #OpenLayers_Control_Attribution_7 { bottom: 3px; }
  --></style>

  <script src="http://www.openlayers.org/api/OpenLayers.js"></script>
  <script>
    map = new OpenLayers.Map("mapdiv_$loc->city");
    map.addLayer(new OpenLayers.Layer.OSM());

    var lonLat = new OpenLayers.LonLat( $loc->lon, $loc->lat )
          .transform(
            new OpenLayers.Projection("EPSG:4326"), // transform from WGS 1984
            map.getProjectionObject() // to Spherical Mercator Projection
          );

    var markers = new OpenLayers.Layer.Markers( "Markers" );
    map.addLayer(markers);

    markers.addMarker(new OpenLayers.Marker(lonLat));

    var size = new OpenLayers.Size(20,16);
    var offset = new OpenLayers.Pixel(0, -(size.h/2));
    var icon = new OpenLayers.Icon('$icon_url',size,offset);

    var ff_loc = $json_locs;
    delete ff_loc["$city"];
    for (key in ff_loc) {
        markers.addMarker(new OpenLayers.Marker(
            new OpenLayers.LonLat( ff_loc[key]['lon'], ff_loc[key]['lat'] )
            .transform(new OpenLayers.Projection("EPSG:4326"),map.getProjectionObject()),
            icon.clone()
        ));
    }

    var zoom=12;
    map.setCenter (lonLat, zoom);
  </script>
EOT;
        }
        return $outstr;
    }

    function output_ff_services($citydata) {
        $outstr = '<ul>';
        if (isset($citydata['services'])) {
            $services = $citydata['services'];
            foreach ($services as $service) {
                $outstr .= sprintf('<li>%s (%s): <a href="%s">%s</a></li>', $service['serviceName'], $service['serviceDescription'], $service['internalUri'], $service['internalUri']);
            }
        }
        $outstr .= '</ul>';
        return $outstr;
    }

    function output_ff_contact($citydata) {
        $outstr = '<p>';
        $contact = $citydata['contact'];
        // Output -- rather ugly but the data is not uniform, some fields are URIs, some are usernames, ...
        if (!empty($contact['email'])) {
            $outstr .= sprintf("E-Mail: <a href=\"mailto:%s\">%s</a><br />\n", $contact['email'], $contact['email']);
        }
        if (!empty($contact['ml'])) {
            $outstr .= sprintf("Mailingliste: <a href=\"mailto:%s\">%s</a><br />\n", $contact['ml'], $contact['ml']);
        }
        if (!empty($contact['irc'])) {
            $outstr .= sprintf("IRC: <a href=\"%s\">%s</a><br />\n", $contact['irc'], $contact['irc']);
        }
        if (!empty($contact['twitter'])) {
            // catch username instead of URI
            if ($contact['twitter'][0] === "@") {
                $twitter_url = 'http://twitter.com/' . ltrim($contact['twitter'], "@");
                $twitter_handle = $contact['twitter'];
            } else {
                $twitter_url = $contact['twitter'];
                $twitter_handle = '@' . substr($contact['twitter'], strrpos($contact['twitter'], '/') + 1);
            }
            $outstr .= sprintf("Twitter: <a href=\"%s\">%s</a><br />\n", $twitter_url, $twitter_handle);
        }
        if (!empty($contact['facebook'])) {
            $outstr .= sprintf("Facebook: <a href=\"%s\">%s</a><br />\n", $contact['facebook'], $contact['facebook']);
        }
        if (!empty($contact['googleplus'])) {
            $outstr .= sprintf("G+: <a href=\"%s\">%s</a><br />\n", $contact['googleplus'], $contact['googleplus']);
        }
        if (!empty($contact['jabber'])) {
            $outstr .= sprintf("XMPP: <a href=\"xmpp:%s\">%s</a><br />\n", $contact['jabber'], $contact['jabber']);
        }
        $outstr .= '</p>';
        return $outstr;
    }

    function shortcode_handler($atts, $content, $shortcode) {
        // $atts[0] holds the city name, if given
        if (empty($atts[0])) {
            $city = get_option('FF_meta_city', FF_META_DEFAULT_CITY);
        } else {
            $city = $atts[0];
        }

        if (false === ($cityurl = $this->dir->get_url_by_city($city))) {
            return "<!-- FF Meta Error: cannot get directory.json, or no URL for '$city' -->\n";
        }

        if (false === ($metadata = FF_Meta_Externaldata::get($cityurl))) {
            return "<!-- FF Meta Error: cannot get metadata from $cityurl -->\n";
        }

        $outstr = "<div class=\"ff $shortcode\">";
        switch ($shortcode) {
        case 'ff_state':
            $outstr .= $this->output_ff_state($metadata);
            break;
        case 'ff_location':
            $outstr .= $this->output_ff_location($metadata);
            break;
        case 'ff_services':
            $outstr .= $this->output_ff_services($metadata);
            break;
        case 'ff_contact':
            $outstr .= $this->output_ff_contact($metadata);
            break;
        default:
            $outstr .= "";
            break;
        }
        $outstr .= "</div>";
        return $outstr;
    }

    function admin_menu() {
        // Options Page:
        add_options_page(
            'FF Meta Plugin',      // page title
            'FF Meta',             // menu title
            'manage_options',      // req'd capability
            'ff_meta_plugin',      // menu slug
            array ('FF_meta', 'options_page') // callback function
        );
    }

    function admin_init() {
        register_setting(
            'ff_meta_settings-group', // group name
            'ff_meta_cachetime'       // option name
        );
        register_setting(
            'ff_meta_settings-group', // group name
            'ff_meta_city'            // option name
        );
        add_settings_section(
            'ff_meta_section-one',          // ID
            'Section One',                  // Title
            array ('FF_Meta', 'section_one_callback'),         // callback to fill
            'ff_meta_plugin'                // page to display on
        );
        add_settings_field(
            'ff_meta_city',          // ID
            'Default community',     // Title
            array ('FF_Meta', 'city_callback'),  // callback to fill field
            'ff_meta_plugin',        // menu page=slug to display field on
            'ff_meta_section-one',   // section to display the field in
            array('label_for' => 'ff_meta_city_id')  // ID of input element
        );
        add_settings_field(
            'ff_meta_cachetime',     // ID
            'Cache time',            // Title
            array ('FF_Meta', 'cachetime_callback'), // callback to fill field
            'ff_meta_plugin',        // menu page=slug to display field on
            'ff_meta_section-one',   // section to display the field in
            array('label_for' => 'ff_meta_cachetime_id')  // ID of input element
        );
    }

    function section_one_callback() {
        echo 'This Plugin provides shortcodes to display information from the Freifunk meta.json.';
    }

    function cachetime_callback() {
        $time = get_option( 'ff_meta_cachetime', FF_META_DEFAULT_CACHETIME );
        echo "<input type='number' name='ff_meta_cachetime' id='ff_meta_cachetime_id' class='small-text code' value='$time' /> minutes"
            ."<p class='description'>Data from external URLs is cached for this number of minutes.</p>";
    }

    function city_callback() {
        if (false === ($directory = FF_Meta_Externaldata::get ( FF_META_DEFAULT_DIR ))) {
            // TODO: error handling
            return;
        }
        $default_city = get_option( 'ff_meta_city', FF_META_DEFAULT_CITY );

        echo "<select name='ff_meta_city' id='ff_meta_city_id' size='1'>";
        foreach (array_keys($directory) as $city) {
            $prettycity = ucwords(str_replace(array('_', '-'), ' ', $city));
            $selected = selected( $default_city, $city );
            echo "<option value='$city' $selected>$prettycity</option>";
        }
        echo "</select>";
        echo "<p class='description'>This is the default city parameter.</p>";
    }

    function options_page() {
        ?>
        <div class="wrap">
            <h2>Freifunk Meta Plugin Options</h2>
            <form action="options.php" method="POST">
                <?php settings_fields( 'ff_meta_settings-group' ); ?>
                <?php do_settings_sections( 'ff_meta_plugin' ); ?>
                <?php submit_button(); ?>
            </form>
        </div>
        <?php
    }

    function uninstall_hook() {
        delete_option( 'ff_meta_city' );
        delete_option( 'ff_meta_cachetime' );
    }

}

$ffmeta = new FF_Meta;
$ffmeta->register_stuff();