gnu-social/plugins/GeonamesPlugin.php

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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 LOCATION_NS = 1;
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public $host = 'ws.geonames.org';
public $username = null;
public $token = null;
public $expiry = 7776000; // 90-day expiry
public $cachePrefix = null; // Optional shared memcache prefix override
// to share lookups between local instances.
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/**
* 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)
{
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$loc = $this->getCache(array('name' => $name,
'language' => $language));
if ($loc !== false) {
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$location = $loc;
return false;
}
try {
$geonames = $this->getGeonames('search',
array('maxRows' => 1,
'q' => $name,
'lang' => $language,
'type' => 'xml'));
} catch (Exception $e) {
$this->log(LOG_WARNING, "Error for $name: " . $e->getMessage());
return true;
}
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if (count($geonames) == 0) {
// no results
$this->setCache(array('name' => $name,
'language' => $language),
null);
return true;
}
$n = $geonames[0];
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$location = new Location();
$location->lat = $this->canonical($n->lat);
$location->lon = $this->canonical($n->lng);
$location->names[$language] = (string)$n->name;
$location->location_id = (string)$n->geonameId;
$location->location_ns = self::LOCATION_NS;
$this->setCache(array('name' => $name,
'language' => $language),
$location);
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// handled, don't continue processing!
return false;
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}
/**
* 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 ($ns != self::LOCATION_NS) {
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// It's not one of our IDs... keep processing
return true;
}
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$loc = $this->getCache(array('id' => $id));
if ($loc !== false) {
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$location = $loc;
return false;
}
try {
$geonames = $this->getGeonames('hierarchy',
array('geonameId' => $id,
'lang' => $language));
} catch (Exception $e) {
$this->log(LOG_WARNING, "Error for ID $id: " . $e->getMessage());
return false;
}
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$parts = array();
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foreach ($geonames as $level) {
if (in_array($level->fcode, array('PCLI', 'ADM1', 'PPL'))) {
$parts[] = (string)$level->name;
}
}
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$last = $geonames[count($geonames)-1];
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if (!in_array($level->fcode, array('PCLI', 'ADM1', 'PPL'))) {
$parts[] = (string)$last->name;
}
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$location = new Location();
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$location->location_id = (string)$last->geonameId;
$location->location_ns = self::LOCATION_NS;
$location->lat = $this->canonical($last->lat);
$location->lon = $this->canonical($last->lng);
$location->names[$language] = implode(', ', array_reverse($parts));
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$this->setCache(array('id' => (string)$last->geonameId),
$location);
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// We're responsible for this namespace; nobody else
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// 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)
{
// Make sure they're canonical
$lat = $this->canonical($lat);
$lon = $this->canonical($lon);
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$loc = $this->getCache(array('lat' => $lat,
'lon' => $lon));
if ($loc !== false) {
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$location = $loc;
return false;
}
try {
$geonames = $this->getGeonames('findNearbyPlaceName',
array('lat' => $lat,
'lng' => $lon,
'lang' => $language));
} catch (Exception $e) {
$this->log(LOG_WARNING, "Error for coords $lat, $lon: " . $e->getMessage());
return true;
}
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if (count($geonames) == 0) {
// no results
$this->setCache(array('lat' => $lat,
'lon' => $lon),
null);
return true;
}
$n = $geonames[0];
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$parts = array();
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$location = new Location();
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$parts[] = (string)$n->name;
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if (!empty($n->adminName1)) {
$parts[] = (string)$n->adminName1;
}
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if (!empty($n->countryName)) {
$parts[] = (string)$n->countryName;
}
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$location->location_id = (string)$n->geonameId;
$location->location_ns = self::LOCATION_NS;
$location->lat = $this->canonical($n->lat);
$location->lon = $this->canonical($n->lng);
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$location->names[$language] = implode(', ', $parts);
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$this->setCache(array('lat' => $lat,
'lon' => $lon),
$location);
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// Success! We handled it, so no further processing
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return false;
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}
/**
* 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::LOCATION_NS) {
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// It's not one of our IDs... keep processing
return true;
}
$id = $location->location_id;
$n = $this->getCache(array('id' => $id,
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'language' => $language));
if ($n !== false) {
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$name = $n;
return false;
}
try {
$geonames = $this->getGeonames('hierarchy',
array('geonameId' => $id,
'lang' => $language));
} catch (Exception $e) {
$this->log(LOG_WARNING, "Error for ID $id: " . $e->getMessage());
return false;
}
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if (count($geonames) == 0) {
$this->setCache(array('id' => $id,
'language' => $language),
null);
return false;
}
$parts = array();
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foreach ($geonames as $level) {
if (in_array($level->fcode, array('PCLI', 'ADM1', 'PPL'))) {
$parts[] = (string)$level->name;
}
}
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$last = $geonames[count($geonames)-1];
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if (!in_array($level->fcode, array('PCLI', 'ADM1', 'PPL'))) {
$parts[] = (string)$last->name;
}
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if (count($parts)) {
$name = implode(', ', array_reverse($parts));
$this->setCache(array('id' => $id,
'language' => $language),
$name);
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}
return false;
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}
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/**
* Human-readable URL for a location
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*
* 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::LOCATION_NS) {
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// 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.
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return false;
}
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/**
* Machine-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 onLocationRdfUrl($location, &$url)
{
if ($location->location_ns != self::LOCATION_NS) {
// It's not one of our IDs... keep processing
return true;
}
$url = 'http://sw.geonames.org/' . $location->location_id . '/';
// it's been filled, so don't process further.
return false;
}
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function getCache($attrs)
{
$c = common_memcache();
if (empty($c)) {
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return null;
}
$key = $this->cacheKey($attrs);
$value = $c->get($key);
return $value;
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}
function setCache($attrs, $loc)
{
$c = common_memcache();
if (empty($c)) {
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return null;
}
$key = $this->cacheKey($attrs);
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$result = $c->set($key, $loc, 0, time() + $this->expiry);
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return $result;
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}
function cacheKey($attrs)
{
$key = 'geonames:' .
implode(',', array_keys($attrs)) . ':'.
common_keyize(implode(',', array_values($attrs)));
if ($this->cachePrefix) {
return $this->cachePrefix . ':' . $key;
} else {
return common_cache_key($key);
}
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}
function wsUrl($method, $params)
{
if (!empty($this->username)) {
$params['username'] = $this->username;
}
if (!empty($this->token)) {
$params['token'] = $this->token;
}
$str = http_build_query($params, null, '&');
return 'http://'.$this->host.'/'.$method.'?'.$str;
}
function getGeonames($method, $params)
{
$client = HTTPClient::start();
$result = $client->get($this->wsUrl($method, $params));
if (!$result->isOk()) {
throw new Exception("HTTP error code " . $result->code);
}
$body = $result->getBody();
if (empty($body)) {
throw new Exception("Empty HTTP body in response");
}
// This will throw an exception if the XML is mal-formed
$document = new SimpleXMLElement($body);
// No children, usually no results
$children = $document->children();
if (count($children) == 0) {
return array();
}
if (isset($document->status)) {
throw new Exception("Error #".$document->status['value']." ('".$document->status['message']."')");
}
// Array of elements, >0 elements
return $document->geoname;
}
function onPluginVersion(&$versions)
{
$versions[] = array('name' => 'Geonames',
'version' => STATUSNET_VERSION,
'author' => 'Evan Prodromou',
'homepage' => 'http://status.net/wiki/Plugin:Geonames',
'rawdescription' =>
_m('Uses <a href="http://geonames.org/">Geonames</a> service to get human-readable '.
'names for locations based on user-provided lat/long pairs.'));
return true;
}
function canonical($coord)
{
$coord = rtrim($coord, "0");
$coord = rtrim($coord, ".");
return $coord;
}
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}