friendica-addons/openstreetmap/openstreetmap.php

<?php
/**
 * Name: OpenStreetMap
 * Description: Use OpenStreetMap for displaying locations. After activation the post location just beneath your avatar in your posts will link to OpenStreetMap.
 * Version: 1.3.1
 * Author: Fabio <http://kirgroup.com/~fabrixxm>
 * Author: Mike Macgirvin <http://macgirvin.com/profile/mike>
 * Author: Klaus Weidenbach
 *
 */

use Friendica\App;
use Friendica\Core\Cache\Enum\Duration;
use Friendica\Core\Hook;
use Friendica\Core\Logger;
use Friendica\Core\Renderer;
use Friendica\DI;
use Friendica\Core\Config\Util\ConfigFileLoader;
use Friendica\Util\Strings;

const OSM_TMS = 'https://www.openstreetmap.org';
const OSM_NOM = 'https://nominatim.openstreetmap.org/search.php';
const OSM_ZOOM = 16;
const OSM_MARKER = 0;

function openstreetmap_install()
{
	Hook::register('load_config',     'addon/openstreetmap/openstreetmap.php', 'openstreetmap_load_config');
	Hook::register('render_location', 'addon/openstreetmap/openstreetmap.php', 'openstreetmap_location');
	Hook::register('generate_map', 'addon/openstreetmap/openstreetmap.php', 'openstreetmap_generate_map');
	Hook::register('generate_named_map', 'addon/openstreetmap/openstreetmap.php', 'openstreetmap_generate_named_map');
	Hook::register('Map::getCoordinates', 'addon/openstreetmap/openstreetmap.php', 'openstreetmap_get_coordinates');
	Hook::register('page_header', 'addon/openstreetmap/openstreetmap.php', 'openstreetmap_alterheader');

	Logger::notice("installed openstreetmap");
}

function openstreetmap_load_config(App $a, ConfigFileLoader $loader)
{
	$a->getConfigCache()->load($loader->loadAddonConfig('openstreetmap'), \Friendica\Core\Config\ValueObject\Cache::SOURCE_STATIC);
}

function openstreetmap_alterheader(App $a, &$navHtml)
{
	$addScriptTag = '<script type="text/javascript" src="' . DI::baseUrl()->get() . '/addon/openstreetmap/openstreetmap.js"></script>' . "\r\n";
	DI::page()['htmlhead'] .= $addScriptTag;
}

/**
 * @brief Add link to a map for an item's set location/coordinates.
 *
 * If an item has coordinates add link to a tile map server, e.g. openstreetmap.org.
 * If an item has a location open it with the help of OSM's Nominatim reverse geocode search.
 *
 * @param mixed $a
 * @param array& $item
 */
function openstreetmap_location(App $a, &$item)
{
	if (!(strlen($item['location']) || strlen($item['coord']))) {
		return;
	}

	/*
	 * Get the configuration variables from the config.
	 * @todo Separate the tile map server from the text-string to map tile server
	 * since they apparently use different URL conventions.
	 * We use OSM's current convention of "#map=zoom/lat/lon" and optional
	 * ?mlat=lat&mlon=lon for markers.
	 */

	$tmsserver = DI::config()->get('openstreetmap', 'tmsserver', OSM_TMS);
	$nomserver = DI::config()->get('openstreetmap', 'nomserver', OSM_NOM);
	$zoom = DI::config()->get('openstreetmap', 'zoom', OSM_ZOOM);
	$marker = DI::config()->get('openstreetmap', 'marker', OSM_MARKER);

	// This is needed since we stored an empty string in the config in previous versions
	if (empty($nomserver)) {
		$nomserver = OSM_NOM;
	}

	if ($item['coord'] != '') {
		$coords = explode(' ', $item['coord']);
		if ((count($coords) > 1) && is_numeric($coords[0]) && is_numeric($coords[1])) {
			$lat = urlencode(round($coords[0], 5));
			$lon = urlencode(round($coords[1], 5));
			$target = $tmsserver;
			if ($marker > 0) {
				$target .= '?mlat=' . $lat . '&mlon=' . $lon;
			}
			$target .= '#map='.intval($zoom).'/'.$lat.'/'.$lon;
		}
	}

	if (empty($target)) {
		$target = $nomserver.'?q='.urlencode($item['location']);
	}

	if ($item['location'] != '') {
		$title = $item['location'];
	} else {
		$title = $item['coord'];
	}

	$item['html'] = '<a target="map" title="' . $title . '" href= "' . $target . '">' . $title . '</a>';
}

function openstreetmap_get_coordinates(App $a, array &$b)
{
	$nomserver = DI::config()->get('openstreetmap', 'nomserver', OSM_NOM);

	// This is needed since we stored an empty string in the config in previous versions
	if (empty($nomserver)) {
		$nomserver = OSM_NOM;
	}

	$args = '?q=' . urlencode($b['location']) . '&format=json';

	$cachekey = 'openstreetmap:' . $b['location'];
	$j = DI::cache()->get($cachekey);

	if (is_null($j)) {
		$curlResult = DI::httpClient()->get($nomserver . $args);
		if ($curlResult->isSuccess()) {
			$j = json_decode($curlResult->getBody(), true);
			DI::cache()->set($cachekey, $j, Duration::MONTH);
		}
	}

	if (!empty($j[0]['lat']) && !empty($j[0]['lon'])) {
		$b['lat'] = $j[0]['lat'];
		$b['lon'] = $j[0]['lon'];
	}
}

function openstreetmap_generate_named_map(App $a, array &$b)
{
	openstreetmap_get_coordinates($a, $b);

	if (!empty($b['lat']) && !empty($b['lon'])) {
		openstreetmap_generate_map($a, $b);
	}
}

function openstreetmap_generate_map(App $a, array &$b)
{
	$tmsserver = DI::config()->get('openstreetmap', 'tmsserver', OSM_TMS);

	if (strpos(DI::baseUrl()->get(true), 'https:') !== false) {
		$tmsserver = str_replace('http:','https:',$tmsserver);
	}

	$zoom = DI::config()->get('openstreetmap', 'zoom', OSM_ZOOM);
	$marker = DI::config()->get('openstreetmap', 'marker', OSM_MARKER);

	$lat = $b['lat']; // round($b['lat'], 5);
	$lon = $b['lon']; // round($b['lon'], 5);

	Logger::debug('lat: ' . $lat);
	Logger::debug('lon: ' . $lon);

	$cardlink = '<a href="' . $tmsserver;

	if ($marker > 0) {
		$cardlink .= '?mlat=' . $lat . '&mlon=' . $lon;
	}

	$cardlink .= '#map=' . $zoom . '/' . $lat . '/' . $lon . '">' . ($b['location'] ??0? Strings::escapeHtml($b['location']) : DI::l10n()->t('View Larger')) . '</a>';
	if (empty($b['mode'])) {
		$b['html'] = '<iframe style="width:100%; height:300px; border:1px solid #ccc" src="' . $tmsserver .
				'/export/embed.html?bbox=' . ($lon - 0.01) . '%2C' . ($lat - 0.01) . '%2C' . ($lon + 0.01) . '%2C' . ($lat + 0.01) .
				'&amp;layer=mapnik&amp;marker=' . $lat . '%2C' . $lon . '" style="border: 1px solid black"></iframe>' .
				'<br/><small>' . $cardlink . '</small>';
	} else {
		$b['html'] .= '<br/>' . $cardlink;
	}

	Logger::debug('generate_map: ' . $b['html']);
}

function openstreetmap_addon_admin(App $a, string &$o)
{
	$t = Renderer::getMarkupTemplate('admin.tpl', 'addon/openstreetmap/');
	$tmsserver = DI::config()->get('openstreetmap', 'tmsserver', OSM_TMS);
	$nomserver = DI::config()->get('openstreetmap', 'nomserver', OSM_NOM);
	$zoom = DI::config()->get('openstreetmap', 'zoom', OSM_ZOOM);
	$marker = DI::config()->get('openstreetmap', 'marker', OSM_MARKER);

	// This is needed since we stored an empty string in the config in previous versions
	if (empty($nomserver)) {
		$nomserver = OSM_NOM;
	}

	$o = Renderer::replaceMacros($t, [
			'$submit' => DI::l10n()->t('Submit'),
			'$tmsserver' => ['tmsserver', DI::l10n()->t('Tile Server URL'), $tmsserver, DI::l10n()->t('A list of <a href="http://wiki.openstreetmap.org/wiki/TMS" target="_blank" rel="noopener noreferrer">public tile servers</a>')],
			'$nomserver' => ['nomserver', DI::l10n()->t('Nominatim (reverse geocoding) Server URL'), $nomserver, DI::l10n()->t('A list of <a href="http://wiki.openstreetmap.org/wiki/Nominatim" target="_blank" rel="noopener noreferrer">Nominatim servers</a>')],
			'$zoom' => ['zoom', DI::l10n()->t('Default zoom'), $zoom, DI::l10n()->t('The default zoom level. (1:world, 18:highest, also depends on tile server)')],
			'$marker' => ['marker', DI::l10n()->t('Include marker on map'), $marker, DI::l10n()->t('Include a marker on the map.')],
	]);
}

function openstreetmap_addon_admin_post(App $a)
{
	DI::config()->set('openstreetmap', 'tmsserver', ($_POST['tmsserver'] ?? '') ?: OSM_TMS);
	DI::config()->set('openstreetmap', 'nomserver', ($_POST['nomserver'] ?? '') ?: OSM_NOM);
	DI::config()->set('openstreetmap', 'zoom', ($_POST['zoom'] ?? '') ?: OSM_ZOOM);
	DI::config()->set('openstreetmap', 'marker', ($_POST['marker'] ?? '') ?: OSM_MARKER);
}