Added code to generate a random GLink if the user doesn't submit one

index.html

@@ -14,7 +14,7 @@
         <input type="text" name="url" id="URL" value="https://example.com" required><br><br>
 
         <label for="labels">GLink:</label><span class="mandatory">*</span>
-        <label for="GLink" id="labels" class="glink">glink.zip/</label><input type="text" name="glink" id="GLink" class="glink" value="exampleWebsite" required>
+        <label for="GLink" id="labels" class="glink">glink.zip/</label><input type="text" name="glink" id="GLink" class="glink" value="exampleWebsite">
 
         <span role="alert" id="error" aria-hidden="true">Invalid URL</span>
 

redirect.php

@@ -0,0 +1,36 @@
+<?php
+	use Cassandra;
+
+	$uri = $_SERVER['REQUEST_URI'];
+	$uri = substr($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']);
+			}
+		}
+	}
+
+?>

result.js

@@ -1,14 +0,0 @@
-console.log('Beginning database execution');
-
-const cassandra = require('cassandra-driver');
-
-const client = new cassandra.Client({
-	contactPoints: ['127.0.0.1:9042'],
-	keyspace: 'glink',
-});
-
-const query = 'SELECT name FROM data WHERE id = ?';
-
-console.log(query);
-
-client.execute(query, [5]).then(result => console.log('User name is %s',result.rows[0].name));

result.php

@@ -1,42 +1,98 @@
 <?php
+
+function gen_base62_rand_shortlink($len) {
+	$rand_bytes = random_bytes(intval(($len * 2) / 3));
+        $rand_string = base64_encode($rand_bytes);
+	$rand_string = str_replace("+","",$rand_string);
+        $rand_string = str_replace("/","",$rand_string);
+        $rand_string = str_replace("=","",$rand_string);
+
+	if (mb_strlen($rand_string) < $len) {
+		$curlen = mb_strlen($rand_string);
+		$rand_string = $rand_string . gen_rand_shortlink($len - $curlen);
+	}
+
+	return $rand_string;
+}
+
+function gen_rand_shortlink($len) {
+	$to_return = '';
+	$possible_chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+	while (mb_strlen($to_return) < $len) {
+		$to_return = $to_return . $possible_chars[rand(0, mb_strlen($possible_chars)-1)];
+	}
+
+	return $to_return;
+
+}
+
+
 ini_set('display_errors', 1);
 use Casssandra;
 
-$cluster = Cassandra::cluster()->build();
+$cluster = Cassandra::cluster()->withPersistentSessions(true)->build();
 $keyspace = 'glink';
 
 $url = $_GET["url"];
+$matches = preg_match('/^http(s)*:\\/\\/[a-zA-Z0-9\\-]+(\\.[a-zA-Z0-9\\-]+)+$/',$url);
+if (($matches == 0) || ($matches == false)) {
+	printf("The URL entered was invalid. Please try again.");
+	return;
+}
+
 $shortlink = $_GET["glink"];
 
+if ($shortlink != '') {
+	$matches_shortlink = preg_match('/^[a-zA-Z]+$/',$shortlink);
+	if (($matches_shortlink == 0) || ($matches_shortlink == false)) {
+	        printf("The GLink entered was invalid. The GLink can only contain letters. Please try again.");
+	        return;
+	}
+} else {
+	/* generate a random shortlink */
+	gen_shortlink:
+		$rand_string = gen_rand_shortlink(6);  /* the function is defined at the start of this file */
+		$shortlink = $rand_string;
+
+		/* Check if shortlink is already taken by querying the database */
+		$statement = $session->prepare('SELECT url FROM data WHERE id=?');
+		$result = $session->execute($statement,array('arguments' => array($shortlink)));
+
+		if ($result->count() != 0) {
+			goto gen_shortlink;
+		}
+
+}
+
 $session = $cluster->connect($keyspace);
 
 //$statement = new Cassandra\SimpleStatement('SELECT name FROM data WHERE id=5');
+
+$statement = $session->prepare('SELECT url FROM data WHERE shortlink=? ALLOW FILTERING');
+$options = array('arguments' => array($shortlink));
+$result = $session->execute($statement,$options);
+
+if ($result->count() != 0) {
+	printf('That GLink is already taken. Please try another one.');
+	exit;
+}
+
 $rand_num = rand(0,99999999);
 
-$values = array(
+$statement = $session->prepare('INSERT INTO data (id, url, shortlink, when_created) VALUES (?,?,?,toTimestamp(now())) USING TTL 20');
-	'id' => $rand_num,
+$result = $session->execute($statement,array('arguments' => array($rand_num,$url,$shortlink)));
-	'url' => $url,
-	'shortlink' => $shortlink,
-);
-$statement = new Cassandra\SimpleStatement('INSERT INTO data (id, url, shortlink, when_created) VALUES (?,?,?,toTimestamp(now()))');
-$options = array('arguments' => $values);
-$result = $session->execute($statement,$options);
-
-$statement = new Cassandra\SimpleStatement('SELECT url,shortlink FROM data WHERE id=?');
-$options = array('arguments' => array('id' => $rand_num));
-$result = $session->execute($statement,$options);
 
 //$stringRepresentation= json_encode($result[0]);
 
 //printf("%s\n\n\n",$stringRepresentation);
 
-foreach($result as $row) {
+//foreach($result as $row) {
-	if (is_null($row)) {
+//	if (is_null($row)) {
-		printf('Unsuccessful');
+//		printf('Unsuccessful');
-	} else {
+//	} else {
-		printf('Successful: The URL you entered was: %s and your GLink is: https://glink.zip/%s', $row['url'],$row['shortlink']);
+		printf('Successful: The URL you entered was: %s and your GLink is: https://glink.zip/%s', $url,$shortlink);
-	}
+//	}
-}
+//}
 //printf('Done');
 
 ?>