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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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