From 1d4606db27c47264a4eed701c4b5df1b4450c271 Mon Sep 17 00:00:00 2001
From: Aadhavan Srinivasan <aadhavan@twomorecents.org>
Date: Thu, 8 Jun 2023 21:36:33 -0500
Subject: [PATCH] Added code to redirect the user if the database query returns
 a URL

---
 redirect.php | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/redirect.php b/redirect.php
index ee9eaae..999bdaa 100644
--- a/redirect.php
+++ b/redirect.php
@@ -1,5 +1,36 @@
 <?php
+	use Cassandra;
+
 	$uri = $_SERVER['REQUEST_URI'];
-	// Take the substring, and verify that it only contains capital and small letters. 
+	$uri = substr($uri,1);
+
+	$matches_uri = preg_match('/^[a-zA-Z]+$/',$uri);
+
+	if (($matches_uri == 0) || ($matches_uri == false)) {
+		header("Location: http://glink.zip/");
+	        exit;
+	} else {
+
+		$cluster = Cassandra::cluster()->withPersistentSessions(true)->build();
+		$keyspace = 'glink';
+		$session = $cluster->connect($keyspace);
+
+		$statement = $session->prepare('SELECT url FROM data WHERE shortlink=? ALLOW FILTERING;');
+		$result = $session->execute($statement,array('arguments' => array($uri)));
+
+		if ($result->count() == 0) {
+			printf('The given GLink was invalid, and doesn\'t point to a specific web page.');
+			exit;
+		}
+
+		foreach($result as $row) {
+			if (is_null($row)) {
+				printf('The given GLink was invalid, and doesn\'t point to a specific web page.');
+				exit;
+			} else {
+				header("Location: " . $row['url']);
+			}
+		}
+	}
 
 ?>