Nominatim: Use OpenStreetMap to resolve coordinates into locations

nominatim/nominatim.php

@@ -0,0 +1,87 @@
+<?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);
+}

nominatim/templates/admin.tpl

@@ -0,0 +1,2 @@
+{{include file="field_input.tpl" field=$language}}
+<div class="submit"><input type="submit" name="page_site" value="{{$submit}}" /></div>