forked from GNUsocial/gnu-social
488 lines
14 KiB
PHP
488 lines
14 KiB
PHP
<?php
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/**
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* StatusNet, the distributed open-source microblogging tool
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*
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* Plugin to convert string locations to Geonames IDs and vice versa
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Action
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2009 StatusNet Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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if (!defined('STATUSNET')) {
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exit(1);
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}
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/**
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* Plugin to convert string locations to Geonames IDs and vice versa
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*
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* This handles most of the events that Location class emits. It uses
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* the geonames.org Web service to convert names like 'Montreal, Quebec, Canada'
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* into IDs and lat/lon pairs.
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*
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* @category Plugin
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*
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* @seeAlso Location
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*/
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class GeonamesPlugin extends Plugin
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{
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const LOCATION_NS = 1;
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public $host = 'ws.geonames.org';
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public $username = null;
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public $token = null;
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public $expiry = 7776000; // 90-day expiry
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/**
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* convert a name into a Location object
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*
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* @param string $name Name to convert
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* @param string $language ISO code for anguage the name is in
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* @param Location &$location Location object (may be null)
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*
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* @return boolean whether to continue (results in $location)
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*/
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function onLocationFromName($name, $language, &$location)
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{
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$loc = $this->getCache(array('name' => $name,
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'language' => $language));
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if ($loc !== false) {
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$location = $loc;
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return false;
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}
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try {
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$geonames = $this->getGeonames('search',
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array('maxRows' => 1,
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'q' => $name,
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'lang' => $language,
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'type' => 'xml'));
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} catch (Exception $e) {
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$this->log(LOG_WARNING, "Error for $name: " . $e->getMessage());
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return true;
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}
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if (count($geonames) == 0) {
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// no results
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$this->setCache(array('name' => $name,
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'language' => $language),
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null);
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return true;
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}
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$n = $geonames[0];
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$location = new Location();
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$location->lat = $this->canonical($n->lat);
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$location->lon = $this->canonical($n->lng);
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$location->names[$language] = (string)$n->name;
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$location->location_id = (string)$n->geonameId;
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$location->location_ns = self::LOCATION_NS;
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$this->setCache(array('name' => $name,
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'language' => $language),
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$location);
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// handled, don't continue processing!
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return false;
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}
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/**
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* convert an id into a Location object
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*
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* @param string $id Name to convert
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* @param string $ns Name to convert
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* @param string $language ISO code for language for results
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* @param Location &$location Location object (may be null)
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*
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* @return boolean whether to continue (results in $location)
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*/
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function onLocationFromId($id, $ns, $language, &$location)
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{
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if ($ns != self::LOCATION_NS) {
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// It's not one of our IDs... keep processing
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return true;
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}
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$loc = $this->getCache(array('id' => $id));
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if ($loc !== false) {
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$location = $loc;
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return false;
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}
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try {
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$geonames = $this->getGeonames('hierarchy',
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array('geonameId' => $id,
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'lang' => $language));
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} catch (Exception $e) {
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$this->log(LOG_WARNING, "Error for ID $id: " . $e->getMessage());
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return false;
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}
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$parts = array();
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foreach ($geonames as $level) {
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if (in_array($level->fcode, array('PCLI', 'ADM1', 'PPL'))) {
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$parts[] = (string)$level->name;
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}
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}
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$last = $geonames[count($geonames)-1];
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if (!in_array($level->fcode, array('PCLI', 'ADM1', 'PPL'))) {
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$parts[] = (string)$last->name;
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}
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$location = new Location();
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$location->location_id = (string)$last->geonameId;
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$location->location_ns = self::LOCATION_NS;
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$location->lat = $this->canonical($last->lat);
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$location->lon = $this->canonical($last->lng);
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$location->names[$language] = implode(', ', array_reverse($parts));
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$this->setCache(array('id' => (string)$last->geonameId),
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$location);
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// We're responsible for this namespace; nobody else
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// can resolve it
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return false;
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}
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/**
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* convert a lat/lon pair into a Location object
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*
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* Given a lat/lon, we try to find a Location that's around
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* it or nearby. We prefer populated places (cities, towns, villages).
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*
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* @param string $lat Latitude
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* @param string $lon Longitude
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* @param string $language ISO code for language for results
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* @param Location &$location Location object (may be null)
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*
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* @return boolean whether to continue (results in $location)
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*/
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function onLocationFromLatLon($lat, $lon, $language, &$location)
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{
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// Make sure they're canonical
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$lat = $this->canonical($lat);
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$lon = $this->canonical($lon);
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$loc = $this->getCache(array('lat' => $lat,
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'lon' => $lon));
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if ($loc !== false) {
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$location = $loc;
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return false;
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}
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try {
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$geonames = $this->getGeonames('findNearbyPlaceName',
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array('lat' => $lat,
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'lng' => $lon,
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'lang' => $language));
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} catch (Exception $e) {
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$this->log(LOG_WARNING, "Error for coords $lat, $lon: " . $e->getMessage());
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return true;
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}
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if (count($geonames) == 0) {
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// no results
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$this->setCache(array('lat' => $lat,
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'lon' => $lon),
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null);
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return true;
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}
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$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)) {
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$parts[] = (string)$n->adminName1;
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}
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if (!empty($n->countryName)) {
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$parts[] = (string)$n->countryName;
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}
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$location->location_id = (string)$n->geonameId;
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$location->location_ns = self::LOCATION_NS;
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$location->lat = $this->canonical($n->lat);
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$location->lon = $this->canonical($n->lng);
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$location->names[$language] = implode(', ', $parts);
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$this->setCache(array('lat' => $lat,
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'lon' => $lon),
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$location);
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// Success! We handled it, so no further processing
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return false;
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}
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/**
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* Human-readable name for a location
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*
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* Given a location, we try to retrieve a human-readable name
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* in the target language.
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*
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* @param Location $location Location to get the name for
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* @param string $language ISO code for language to find name in
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* @param string &$name Place to put the name
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*
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* @return boolean whether to continue
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*/
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function onLocationNameLanguage($location, $language, &$name)
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{
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if ($location->location_ns != self::LOCATION_NS) {
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// It's not one of our IDs... keep processing
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return true;
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}
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$id = $location->location_id;
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$n = $this->getCache(array('id' => $id,
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'language' => $language));
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if ($n !== false) {
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$name = $n;
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return false;
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}
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try {
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$geonames = $this->getGeonames('hierarchy',
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array('geonameId' => $id,
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'lang' => $language));
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} catch (Exception $e) {
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$this->log(LOG_WARNING, "Error for ID $id: " . $e->getMessage());
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return false;
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}
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if (count($geonames) == 0) {
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$this->setCache(array('id' => $id,
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'language' => $language),
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null);
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return false;
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}
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$parts = array();
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foreach ($geonames as $level) {
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if (in_array($level->fcode, array('PCLI', 'ADM1', 'PPL'))) {
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$parts[] = (string)$level->name;
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}
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}
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$last = $geonames[count($geonames)-1];
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if (!in_array($level->fcode, array('PCLI', 'ADM1', 'PPL'))) {
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$parts[] = (string)$last->name;
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}
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if (count($parts)) {
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$name = implode(', ', array_reverse($parts));
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$this->setCache(array('id' => $id,
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'language' => $language),
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$name);
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}
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return false;
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}
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/**
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* Human-readable URL for a location
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*
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* Given a location, we try to retrieve a geonames.org URL.
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*
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* @param Location $location Location to get the url for
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* @param string &$url Place to put the url
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*
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* @return boolean whether to continue
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*/
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function onLocationUrl($location, &$url)
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{
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if ($location->location_ns != self::LOCATION_NS) {
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// It's not one of our IDs... keep processing
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return true;
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}
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$url = 'http://www.geonames.org/' . $location->location_id;
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// it's been filled, so don't process further.
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return false;
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}
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/**
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* Machine-readable name for a location
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*
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* Given a location, we try to retrieve a geonames.org URL.
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*
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* @param Location $location Location to get the url for
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* @param string &$url Place to put the url
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*
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* @return boolean whether to continue
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*/
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function onLocationRdfUrl($location, &$url)
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{
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if ($location->location_ns != self::LOCATION_NS) {
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// It's not one of our IDs... keep processing
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return true;
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}
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$url = 'http://sw.geonames.org/' . $location->location_id . '/';
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// it's been filled, so don't process further.
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return false;
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}
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function getCache($attrs)
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{
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$c = common_memcache();
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if (empty($c)) {
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return null;
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}
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$key = $this->cacheKey($attrs);
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$value = $c->get($key);
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return $value;
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}
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function setCache($attrs, $loc)
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{
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$c = common_memcache();
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if (empty($c)) {
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return null;
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}
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$key = $this->cacheKey($attrs);
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$result = $c->set($key, $loc, 0, time() + $this->expiry);
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return $result;
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}
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function cacheKey($attrs)
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{
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return common_cache_key('geonames:'.
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implode(',', array_keys($attrs)) . ':'.
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common_keyize(implode(',', array_values($attrs))));
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}
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function wsUrl($method, $params)
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{
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if (!empty($this->username)) {
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$params['username'] = $this->username;
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}
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if (!empty($this->token)) {
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$params['token'] = $this->token;
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}
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$str = http_build_query($params, null, '&');
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return 'http://'.$this->host.'/'.$method.'?'.$str;
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}
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function getGeonames($method, $params)
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{
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$client = HTTPClient::start();
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$result = $client->get($this->wsUrl($method, $params));
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if (!$result->isOk()) {
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throw new Exception("HTTP error code " . $result->code);
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}
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$body = $result->getBody();
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if (empty($body)) {
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throw new Exception("Empty HTTP body in response");
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}
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// This will throw an exception if the XML is mal-formed
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$document = new SimpleXMLElement($body);
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// No children, usually no results
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$children = $document->children();
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if (count($children) == 0) {
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return array();
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}
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if (isset($document->status)) {
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throw new Exception("Error #".$document->status['value']." ('".$document->status['message']."')");
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}
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// Array of elements, >0 elements
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return $document->geoname;
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}
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function onPluginVersion(&$versions)
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{
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$versions[] = array('name' => 'Geonames',
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'version' => STATUSNET_VERSION,
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'author' => 'Evan Prodromou',
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'homepage' => 'http://status.net/wiki/Plugin:Geonames',
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'rawdescription' =>
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_m('Uses <a href="http://geonames.org/">Geonames</a> service to get human-readable '.
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'names for locations based on user-provided lat/long pairs.'));
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return true;
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}
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function canonical($coord)
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{
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$coord = rtrim($coord, "0");
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$coord = rtrim($coord, ".");
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return $coord;
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}
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}
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