leaflet-map / class.geocoder.php

class.geocoder.php in Leaflet Map 2.10.0, at class.geocoder.php

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1	<?php
2	/**
3	* Geocoder
4	*
5	* calls the specific geocoder function (chosen in admin or default: google_geocode)
6	*
7	*/
8
9	class Leaflet_Geocoder {
10	/**
11	* Geocoder should return this on error/not found
12	* @var array $not_found
13	*/
14	private $not_found = array('lat' => 0, 'lng' => 0);
15	/**
16	* Latitude
17	* @var float $lat
18	*/
19	public $lat = 0;
20	/**
21	* Longitude
22	* @var float $lng
23	*/
24	public $lng = 0;
25
26	/**
27	* new Geocoder from address
28	*
29	* handles url encoding and caching
30	*
31	* @param string $address the requested address to look up
32	* @return NOTHING
33	*/
34	public function __construct ($address) {
35	$settings = Leaflet_Map_Plugin_Settings::init();
36	$address = urlencode( $address );
37
38	$geocoder = $settings->get('geocoder');
39
40	$cached_address = 'leaflet_' . $geocoder . '_' . $address;
41
42	/* retrieve cached geocoded location */
43	$found_cache = get_option( $cached_address );
44
45	if ( $found_cache ) {
46	$location = $found_cache;
47	} else {
48	// try geocoding
49	$geocoding_method = $geocoder . '_geocode';
50
51	try {
52	$location = (Object) $this->$geocoding_method( $address );
53
54	/* add location */
55	add_option($cached_address, $location);
56
57	/* add option key to locations for clean up purposes */
58	$locations = get_option('leaflet_geocoded_locations', array());
59	array_push($locations, $cached_address);
60	update_option('leaflet_geocoded_locations', $locations);
61	} catch (Exception $e) {
62	// failed
63	$location = $this->not_found;
64	}
65	}
66
67	// set variables
68	$this->lat = $location->lat;
69	$this->lng = $location->lng;
70	}
71
72	/**
73	* Removes location caches
74	*/
75	public static function remove_caches () {
76	$addresses = get_option('leaflet_geocoded_locations', array());
77	foreach ($addresses as $address) {
78	delete_option($address);
79	}
80	delete_option('leaflet_geocoded_locations');
81	}
82
83	/**
84	* Used by geocoders to make requests via curl or file_get_contents
85	*
86	* includes a try/catch
87	*
88	* @param string $url the urlencoded request url
89	* @return varies object from API or null (failed)
90	*/
91	private function get_url( $url ) {
92	if (in_array('curl', get_loaded_extensions())) {
93	/* try curl */
94	$ch = curl_init();
95
96	curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE);
97	curl_setopt($ch, CURLOPT_HEADER, 0);
98	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
99	curl_setopt($ch, CURLOPT_URL, $url);
100	curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
101
102	$data = curl_exec($ch);
103	curl_close($ch);
104
105	return $data;
106	} else if (ini_get('allow_url_fopen')) {
107	/* try file get contents */
108	return file_get_contents( $url );
109	}
110
111	$error_msg = 'Could not get url: ' . $url;
112	throw new Exception( $error_msg );
113	}
114
115	/**
116	* Google geocoder (https://developers.google.com/maps/documentation/geocoding/start)
117	*
118	* @param string $address the urlencoded address to look up
119	* @return varies object from API or null (failed)
120	*/
121
122	private function google_geocode ( $address ) {
123	$geocode_url = 'https://maps.googleapis.com/maps/api/geocode/json?address=';
124	$geocode_url .= $address;
125	$json = $this->get_url($geocode_url);
126
127	if ($json) {
128	$json = json_decode($json);
129	/* found location */
130	if ($json->{'status'} == 'OK') {
131
132	$location = $json->{'results'}[0]->{'geometry'}->{'location'};
133
134	return (Object) $location;
135	}
136	}
137
138	return $this->not_found;
139	}
140
141	/**
142	* OpenStreetMap geocoder Nominatim (https://nominatim.openstreetmap.org/)
143	*
144	* @param string $address the urlencoded address to look up
145	* @return varies object from API or null (failed)
146	*/
147
148	private function osm_geocode ( $address ) {
149	$geocode_url = 'https://nominatim.openstreetmap.org/?format=json&limit=1&q=';
150	$geocode_url .= $address;
151	$json = $this->get_url($geocode_url);
152	$json = json_decode($json);
153
154	if (is_array($json) &&
155	is_object($json[0]) &&
156	$json[0]->lat) {
157	// found location
158	return (Object) array(
159	'lat' => $json[0]->lat,
160	'lng' => $json[0]->lon,
161	);
162	}
163
164	return $this->not_found;
165	}
166
167	/**
168	* Danish Addresses Web Application
169	* (https://dawa.aws.dk)
170	*
171	* @param string $address the urlencoded address to look up
172	* @return varies object from API or null (failed)
173	*/
174
175	private function dawa_geocode ( $address ) {
176	$geocode_url = 'https://dawa.aws.dk/adresser?format=json&q=';
177	$geocode_url .= $address;
178	$json = $this->get_url($geocode_url);
179	$json = json_decode($json);
180
181	if (is_array($json) &&
182	is_object($json[0]) &&
183	$json[0]->status == 1) {
184	/* found location */
185	$location = (Object) array(
186	'lat' => $json[0]->adgangsadresse->adgangspunkt->koordinater[1],
187	'lng' => $json[0]->adgangsadresse->adgangspunkt->koordinater[0]
188	);
189
190	return $location;
191	}
192
193	return $this->not_found;
194	}
195	}