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+<?php
+/**
+ * StatusNet, the distributed open-source microblogging tool
+ *
+ * Plugin to convert string locations to Geonames IDs and vice versa
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category Action
+ * @package StatusNet
+ * @author Evan Prodromou <evan@status.net>
+ * @copyright 2009 StatusNet Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://status.net/
+ */
+
+if (!defined('STATUSNET')) {
+ exit(1);
+}
+
+/**
+ * Plugin to convert string locations to Geonames IDs and vice versa
+ *
+ * This handles most of the events that Location class emits. It uses
+ * the geonames.org Web service to convert names like 'Montreal, Quebec, Canada'
+ * into IDs and lat/lon pairs.
+ *
+ * @category Plugin
+ * @package StatusNet
+ * @author Evan Prodromou <evan@status.net>
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://status.net/
+ *
+ * @seeAlso Location
+ */
+
+class GeonamesPlugin extends Plugin
+{
+ const NAMESPACE = 1;
+
+ /**
+ * convert a name into a Location object
+ *
+ * @param string $name Name to convert
+ * @param string $language ISO code for anguage the name is in
+ * @param Location &$location Location object (may be null)
+ *
+ * @return boolean whether to continue (results in $location)
+ */
+
+ function onLocationFromName($name, $language, &$location)
+ {
+ $client = HTTPClient::start();
+
+ // XXX: break down a name by commas, narrow by each
+
+ $str = http_build_query(array('maxRows' => 1,
+ 'q' => $name,
+ 'lang' => $language,
+ 'type' => 'json'));
+
+ $result = $client->get('http://ws.geonames.org/search?'.$str);
+
+ if ($result->isOk()) {
+ $rj = json_decode($result->getBody());
+ if (count($rj->geonames) > 0) {
+ $n = $rj->geonames[0];
+
+ $location = new Location();
+
+ $location->lat = $n->lat;
+ $location->lon = $n->lng;
+ $location->names[$language] = $n->name;
+ $location->location_id = $n->geonameId;
+ $location->location_ns = self::NAMESPACE;
+
+ // handled, don't continue processing!
+ return false;
+ }
+ }
+
+ // Continue processing; we don't have the answer
+ return true;
+ }
+
+ /**
+ * convert an id into a Location object
+ *
+ * @param string $id Name to convert
+ * @param string $ns Name to convert
+ * @param string $language ISO code for language for results
+ * @param Location &$location Location object (may be null)
+ *
+ * @return boolean whether to continue (results in $location)
+ */
+
+ function onLocationFromId($id, $ns, $language, &$location)
+ {
+ if ($ns != self::NAMESPACE) {
+ // It's not one of our IDs... keep processing
+ return true;
+ }
+
+ $client = HTTPClient::start();
+
+ $str = http_build_query(array('geonameId' => $id,
+ 'lang' => $language));
+
+ $result = $client->get('http://ws.geonames.org/hierarchyJSON?'.$str);
+
+ if ($result->isOk()) {
+
+ $rj = json_decode($result->getBody());
+
+ if (count($rj->geonames) > 0) {
+
+ $parts = array();
+
+ foreach ($rj->geonames as $level) {
+ if (in_array($level->fcode, array('PCLI', 'ADM1', 'PPL'))) {
+ $parts[] = $level->name;
+ }
+ }
+
+ $last = $rj->geonames[count($rj->geonames)-1];
+
+ if (!in_array($level->fcode, array('PCLI', 'ADM1', 'PPL'))) {
+ $parts[] = $last->name;
+ }
+
+ $location = new Location();
+
+ $location->location_id = $last->geonameId;
+ $location->location_ns = self::NAMESPACE;
+ $location->lat = $last->lat;
+ $location->lon = $last->lng;
+ $location->names[$language] = implode(', ', array_reverse($parts));
+ }
+ }
+
+ // We're responsible for this NAMESPACE; nobody else
+ // can resolve it
+
+ return false;
+ }
+
+ /**
+ * convert a lat/lon pair into a Location object
+ *
+ * Given a lat/lon, we try to find a Location that's around
+ * it or nearby. We prefer populated places (cities, towns, villages).
+ *
+ * @param string $lat Latitude
+ * @param string $lon Longitude
+ * @param string $language ISO code for language for results
+ * @param Location &$location Location object (may be null)
+ *
+ * @return boolean whether to continue (results in $location)
+ */
+
+ function onLocationFromLatLon($lat, $lon, $language, &$location)
+ {
+ $client = HTTPClient::start();
+
+ $str = http_build_query(array('lat' => $lat,
+ 'lng' => $lon,
+ 'lang' => $language));
+
+ $result =
+ $client->get('http://ws.geonames.org/findNearbyPlaceNameJSON?'.$str);
+
+ if ($result->isOk()) {
+
+ $rj = json_decode($result->getBody());
+
+ if (count($rj->geonames) > 0) {
+
+ $n = $rj->geonames[0];
+
+ $parts = array();
+
+ $location = new Location();
+
+ $parts[] = $n->name;
+
+ if (!empty($n->adminName1)) {
+ $parts[] = $n->adminName1;
+ }
+
+ if (!empty($n->countryName)) {
+ $parts[] = $n->countryName;
+ }
+
+ $location->location_id = $n->geonameId;
+ $location->location_ns = self::NAMESPACE;
+ $location->lat = $lat;
+ $location->lon = $lon;
+
+ $location->names[$language] = implode(', ', $parts);
+
+ // Success! We handled it, so no further processing
+
+ return false;
+ }
+ }
+
+ // For some reason we don't know, so pass.
+
+ return true;
+ }
+
+ /**
+ * Human-readable name for a location
+ *
+ * Given a location, we try to retrieve a human-readable name
+ * in the target language.
+ *
+ * @param Location $location Location to get the name for
+ * @param string $language ISO code for language to find name in
+ * @param string &$name Place to put the name
+ *
+ * @return boolean whether to continue
+ */
+
+ function onLocationNameLanguage($location, $language, &$name)
+ {
+ if ($location->location_ns != self::NAMESPACE) {
+ // It's not one of our IDs... keep processing
+ return true;
+ }
+
+ $client = HTTPClient::start();
+
+ $str = http_build_query(array('geonameId' => $id,
+ 'lang' => $language));
+
+ $result = $client->get('http://ws.geonames.org/hierarchyJSON?'.$str);
+
+ if ($result->isOk()) {
+
+ $rj = json_decode($result->getBody());
+
+ if (count($rj->geonames) > 0) {
+
+ $parts = array();
+
+ foreach ($rj->geonames as $level) {
+ if (in_array($level->fcode, array('PCLI', 'ADM1', 'PPL'))) {
+ $parts[] = $level->name;
+ }
+ }
+
+ $last = $rj->geonames[count($rj->geonames)-1];
+
+ if (!in_array($level->fcode, array('PCLI', 'ADM1', 'PPL'))) {
+ $parts[] = $last->name;
+ }
+
+ if (count($parts)) {
+ $name = implode(', ', array_reverse($parts));
+ return false;
+ }
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * Human-readable name for a location
+ *
+ * Given a location, we try to retrieve a geonames.org URL.
+ *
+ * @param Location $location Location to get the url for
+ * @param string &$url Place to put the url
+ *
+ * @return boolean whether to continue
+ */
+
+ function onLocationUrl($location, &$url)
+ {
+ if ($location->location_ns != self::NAMESPACE) {
+ // It's not one of our IDs... keep processing
+ return true;
+ }
+
+ $url = 'http://www.geonames.org/' . $location->location_id;
+
+ // it's been filled, so don't process further.
+ return false;
+ }
+}
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