159 lines
5.5 KiB
PHP
159 lines
5.5 KiB
PHP
<?php
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defined( 'ABSPATH' ) or die( 'No script kiddies please!' );
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function wolkal3000_geocity($location) {
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// Wenn die Adresse im Feld Stadt steht, wird sie richtig angezeigt, ergo:
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$pattern = '/(.*), ([0-9]{5} [^,]+)/';
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preg_match ($pattern, $location, $matches);
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if ( empty ($matches[2])) {
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return ($location);
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} else {
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return ($matches[2]);
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}
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}
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function wolkal3000_geoshow($location) {
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// later
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// not NULL so kal3000_the_termin_geo() displays a map if lat/lon are available.
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// Hotel-Gasthof Maisberger, Bahnhofstraße 54, 85375 Neufahrn bei Freising, Deutschland
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// alles bis ", [0-9]{5}" ist geoshow
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// alles ab [0-9]{5}[\,]+ ist geocity.
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$pattern = '/(.*), ([0-9]{5} [^,]+)/';
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preg_match ($pattern, $location, $matches);
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return ($matches[1]);
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}
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function wolkal3000_geocode($location) {
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// we try to cache results as we will need many times the same results especially for recurring events.
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// we will use a hash for the location because the hash has a fixed length, while the location has not.
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// This table will grow indefinitely over time, so we need to add a timestamp field and remove
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// entries that are older than, say, 30 days each time.
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// this will also cope with Google subtly changing location strings in Maps over time.
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// new entries will thus replace outdated ones over time.
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/*
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Caching neu: in wp_options-> wolkal3000_options ein Array geocache anlegen. Darunter für jeden hash ein Array schreiben, also:
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Datenmodell:
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$geocache = array (
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hash1 = array (
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'wolkal3000_geo_lat' => '',
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'wolkal3000_geo_lon' => '',
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'wolkal3000_geo_timestamp' => 0,
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),
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hash2 = array ...
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);
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Schreiben:
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$options = get_options ( 'wolkal3000_options' );
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$geocache = $options ( 'geocache' );
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$geocache['hashx'] = array ( $lat, $lon, time(), );
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$options ( 'geocache' ) = $geocache;
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Löschen:
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foreach ( $geocache as $key => $value ) {
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if ( $key['wolkal3000_geo_timestamp'] < time() - 2592000 ) {
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unset ( $options['geocache']['hashx'] )
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}
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}
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set_options ( 'wolkal3000_options' );
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Suchen: if ( isset ( $options['geocache']['hashx'] ) ) ...
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*/
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if ( '' == $location ) {
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return array ('', '');
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}
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// check the cache first
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global $wpdb;
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$table = $wpdb->prefix.WOLKAL3000_GEO_TABLE;
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$hash = hash ('md5', $location);
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$query = "SELECT wolkal3000_geo_lat, wolkal3000_geo_lon FROM $table WHERE wolkal3000_geo_hash = '$hash'";
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$result = $wpdb->get_row( $query, ARRAY_N );
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if ( $wpdb->num_rows == 1 ) { // it should only be a single row!
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wolkal3000_error_log (INFO, "geocode cache hit hash $hash lat $result[0] lon $result[1]");
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} else {
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// do the housekeeping first, before we create a new caching entry.
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// remove all cache entries which are older than 30 days.
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$outdated = time() - 2592000; // 30 Tage
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$query = "DELETE FROM $table WHERE wolkal3000_geo_timestamp < $outdated";
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$wpdb->query($query);
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$options = get_option('wolkal3000_options');
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$result = array ('', '');
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switch ( $options['wolkal3000_geocoding'] ) {
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case "osm" :
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$result = wolkal3000_geocode_osm($location);
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break;
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}
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$file = dirname (__FILE__) . "/geocode-result-$hash.txt";
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file_put_contents ($file, var_export ($result, TRUE));
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// do the caching now, but only if both values are set.
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// $wpdb_insert does all the sanitizing for us.
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$lat = $result[0];
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$lon = $result[1];
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if ('' != $lat && '' != $lon) {
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$wpdb->insert($table, array(
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'wolkal3000_geo_location' => substr( $location, 0, 128 ),
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'wolkal3000_geo_hash' => $hash,
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'wolkal3000_geo_lat' => $lat,
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'wolkal3000_geo_lon' => $lon,
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'wolkal3000_geo_timestamp' => time(),
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));
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wolkal3000_error_log (INFO, "geocoded and cached lat=$lat lon=$lon for location $location");
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}
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// error handling?
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}
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return ($result);
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}
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function wolkal3000_geocode_osm($location) {
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// https://wiki.openstreetmap.org/wiki/Nominatim
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// https://nominatim.openstreetmap.org/search?q=Hotel+Gumberger+Gasthof+GmbH&format=json'
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$location = urlencode($location);
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wolkal3000_error_log (INFO, "wolkal3000_geocode_osm: location $location");
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// the main problem with Nominatim is that it doesn't understand calendar location information very well.
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// we ought to cut off the location name and the country, i.e. zip code, city & street address only
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$url = 'https://nominatim.openstreetmap.org/search?q="' . $location . '"&format=json';
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$response = wp_remote_get($url);
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$json = wp_remote_retrieve_body($response);
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$http_code = wp_remote_retrieve_response_code($response);
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// we need to catch errors
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// https://www.php.net/manual/en/function.json-decode.php
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$decoded = json_decode($json, true);
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// TODO error handling e.g. if we get no usable values.
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/*
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$file = dirname (__FILE__) . '/json-decoded.txt';
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// should simply be ->lat and -> lon
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file_put_contents ($file, var_export ($decoded, TRUE));
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// The first array level ([0]) is only needed because OSM returns a JSON with enclosing [].
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*/
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$lat = $decoded['0']['lat'];
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$lon = $decoded['0']['lon'];
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wolkal3000_error_log (INFO, "wolkal3000_geocode_osm found lat=$lat lon=$lon loc $location");
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return array ($lat, $lon);
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}
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