OpenStreetMap and OpenTopoMap local cache

index.php

<?php

// configuration : https://www.visugpx.com/forum/read_13532.html
error_reporting(E_ALL);
ini_set('display_errors', 1);
ini_set('default_socket_timeout', 20);

//echo '<pre>'; print_r($_SERVER); exit;
$host = getenv('HTTP_HOST');
$tile = getenv('REQUEST_URI');

if (stripos($tile, 'test.png') !== false) {
	exit('TileCache 1.4, PHP '.PHP_VERSION.', host: '.$host);
}

if (stripos($host, 'openstreetmap') !== false) {
	$dir = 'osm'; // open street map
	$ip  = '151.101.122.217';
	if ($host == 'tile.openstreetmap.org')
		$host = 'a.tile.openstreetmap.org';
}
else if (stripos($host, 'opentopomap') !== false) {
	$dir = 'otm'; // open topo map
	$ip  = '131.188.76.144';
	if ($host == 'tile.opentopomap.org')
		$host = 'a.tile.opentopomap.org';
}
else if (stripos($host, 'tile.thunder') !== false) {
	$dir = 'ocm'; // open cycle map
	$ip  = '88.99.98.237';
}
else if (stripos($host, 'geo.admin.ch') !== false) {
	$host = 'wmts1.geo.admin.ch';
	$dir = 'stm'; // swiss topo map
	$ip  = '13.32.219.80';
}
else {
	header('HTTP/1.1 404 Not Found');
	exit('unknown host: '.$host);
}

$file = $dir.strtok($tile, '?');
if (is_file($file) && (filesize($file) < 500))
	unlink($file);

if (!is_file($file)) {
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_DNS_USE_GLOBAL_CACHE, false);
	curl_setopt($ch, CURLOPT_RESOLVE, [$host.':443:'.$ip]);
	curl_setopt($ch, CURLOPT_URL, getenv('REQUEST_SCHEME').'://'.$host.$tile);
	curl_setopt($ch, CURLOPT_USERAGENT, getenv('HTTP_USER_AGENT'));
	curl_setopt($ch, CURLOPT_REFERER, getenv('HTTP_REFERER'));
	curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 8);
	curl_setopt($ch, CURLOPT_TIMEOUT, 8);
	curl_setopt($ch, CURLOPT_HTTPHEADER, [
		'Accept: */*',
		'Accept-Language: en-us,en;q=0.5',
	]);
	$result = curl_exec($ch);
	$result = (($result === false) || (curl_errno($ch) !== 0)) ? false : $result;
	curl_close($ch);
	if (empty($result)) {
		header('HTTP/1.1 500 Internal Server Error');
		var_dump($result);
		exit;
	}
	else {
		$dir = dirname($file);
		if (!is_dir($dir)) {
			mkdir($dir, 0755, true);
		}
		if (is_dir($dir)) {
			file_put_contents($file, $result);
		}
	}
}

if (is_file($file)) {
	header('Access-Control-Allow-Origin: *');
	header('Content-Type: image/png');
	echo file_get_contents($file);
}
else {
	header('HTTP/1.1 404 Not Found');
	echo '404';
}