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Nominatim: Use OpenStreetMap to resolve coordinates into locations

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Michael 2020-09-24 04:01:12 +00:00
parent 8223b54d0b
commit df1d9d770c
2 changed files with 89 additions and 0 deletions
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87
nominatim/nominatim.php Normal file
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<?php
/**
* Name: Nominatim
* Description: Use Nominatim from OpenStreetMap to resolve the location for the given latitude and longitude. Derived from "geocoordinates"
* Version: 0.1
* Author: Michael Vogel <https://pirati.ca/profile/heluecht>
*/
use Friendica\Core\Hook;
use Friendica\Core\Logger;
use Friendica\Core\Renderer;
use Friendica\DI;
function nominatim_install()
{
Hook::register('post_local', 'addon/nominatim/nominatim.php', 'nominatim_post_hook');
Hook::register('post_remote', 'addon/nominatim/nominatim.php', 'nominatim_post_hook');
}
function nominatim_resolve_item(&$item)
{
if(empty($item['coord']) || !empty($item['location'])) {
return;
}
$language = DI::config()->get('nominatim', 'language');
if (empty($language)) {
$language = 'en';
}
$coords = explode(' ',$item['coord']);
if (count($coords) < 2) {
return;
}
$coords[0] = round($coords[0], 5);
$coords[1] = round($coords[1], 5);
$result = DI::cache()->get('nominatim:' . $language . ':' . $coords[0] . '-' . $coords[1]);
if (!is_null($result)) {
$item['location'] = $result;
return;
}
$s = DI::httpRequest()->fetch('https://nominatim.openstreetmap.org/reverse?lat=' . $coords[0] . '&lon=' . $coords[1] . '&format=json&addressdetails=0&accept-language=' . $language);
if (empty($s)) {
Logger::info('API could not be queried');
return;
}
$data = json_decode($s, true);
if (empty($data['display_name'])) {
Logger::info('No results found for coordinates', ['coordinates' => $item['coord'], 'data' => $data]);
return;
}
$item['location'] = $data['display_name'];
Logger::info('Got location', ['lat' => $coords[0], 'long' => $coords[1], 'location' => $item['location']]);
if (!empty($item['location'])) {
DI::cache()->set('nominatim:' . $language . ':' . $coords[0] . '-' . $coords[1], $item['location']);
}
}
function nominatim_post_hook($a, &$item)
{
nominatim_resolve_item($item);
}
function nominatim_addon_admin(&$a, &$o)
{
$t = Renderer::getMarkupTemplate('admin.tpl', 'addon/nominatim/');
$o = Renderer::replaceMacros($t, [
'$submit' => DI::l10n()->t('Save Settings'),
'$language' => ['language', DI::l10n()->t('Language code (IETF format)'), DI::config()->get('nominatim', 'language'), ''],
]);
}
function nominatim_addon_admin_post(&$a)
{
$language = !empty($_POST['language']) ? trim($_POST['language']) : '';
DI::config()->set('nominatim', 'language', $language);
}

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nominatim/templates/admin.tpl Normal file
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{{include file="field_input.tpl" field=$language}}
<div class="submit"><input type="submit" name="page_site" value="{{$submit}}" /></div>