1 files changed, 30 insertions, 0 deletions
diff --git a/resolve.php b/resolve.php
new file mode 100644
index 0000000..4df1c8c
--- /dev/null
+++ b/resolve.php
@@ -0,0 +1,30 @@
+<?php
+# TODO rate limiting
+require_once __DIR__ . '/vendor/autoload.php';
+
+use GuzzleHttp\Client;
+
+function resolveURL($url) {
+
+	$client   = new Client();
+
+	try {
+		$response = $client->request('HEAD', $url, [ 'on_stats' => function( GuzzleHttp\TransferStats $stats ) use ( &$effectiveURL ){ $effectiveURL = $stats->getEffectiveUri(); }])
+			    ->getBody()->getContents();
+	} catch(\Exception $e) {
+		return $url;
+	}
+
+	return $effectiveURL->__toString();
+}
+
+function getURL() {
+	if ( empty($_REQUEST['url']) ) {
+		$data = json_decode(file_get_contents('php://input'), true);
+		return $data['url'];
+	} else {
+		return $_REQUEST['url'];
+	}
+}
+
+echo json_encode( ['url' => resolveURL( getURL() ) ]);