updates and new router( link.php )

index.php

@@ -13,9 +13,11 @@
   <h1>hackers.town L00p</h1>
   <p>The return of the webring</p>
   <p><a class="title" href="https://git.hackers.town/c0debabe/web-l00p/issues/new">Add Your Website</a></p>
-  <iframe src="https://l00p.hackers.town/frame.php?id=0" style="width: 100%; border: 0;" />
+  <iframe src="https://l00p.hackers.town/frame.php?id=0" style="width: 100%; border: 0;"></iframe>
 </div>
 
+<p><a href="link.php" style="color: black;">dev link</a></p>
+
 </body>
 </html>
 

link.php

@@ -1,7 +1,9 @@
 <?php
 
 $id_key = "id";
+$go_key = "go";
 $id = 0;
+$go = "e";
 
 if( isset( $_GET ) && !empty( $_GET ) ) {
   $a_keys = array_keys( $_GET );
@@ -9,17 +11,29 @@ if( isset( $_GET ) && !empty( $_GET ) ) {
     $id = $_GET[$id_key] * 1;
   } else {
     // ID is not valid
-    print "e02";
+    print "i02. ";
+    exit();
+  }
+  if( in_array( $go_key, $a_keys ) && isset($_GET[$go_key]) ) {
+    // first character of what should be a string
+    $go = $_GET[$go_key][0];
+    if( $go != "n" && $go != "p" && $go != "r" ) {
+      print "g02. ";
+      exit();
+    }
+  } else {
+    // ID is not valid
+    print "g01. ";
     exit();
   }
 } else {
   // ID is not valid
-  print "e01";
+  print "i01. ";
   exit();
 }
 // ID is too small
 if( $id < 0 ) {
-  print "e03";
+  print "i03. ";
   exit();
 }
 
@@ -28,46 +42,39 @@ require( 'ring.php' );
 
 // ID is too large
 if( $id >= $ring_size ) {
-  print "e04";
+  print "i04. ";
   exit();
 }
 
 $last = $ring_size - 1;
 $index = array_keys( $web_ring );
 
-$expected_domain = $web_ring[ $index[$id] ];
-$frame_parent = $_SERVER['HTTP_REFERER']."";
+/* =============================================================================== */
 
-if( $expected_domain != $frame_parent ) {
-  $position = strpos( $frame_parent, $expected_domain );
-  if( $position != 0 ) {
-    print "e05";
-    exit();
+$go_url = "";
+
+if( $go == "r") {
+  $go_url = $web_ring[$index[rand(0,$last)]];
+} else {
+  $prev = "";
+  $next = "";
+  if( $id == $last ) { // are we at the end?
+    $next = $index[0]; // first one
+    $prev = $index[$id-1]; // previous one
+  } else if( $id == 0 ) { // are we at the beginning?
+    $next = $index[$id+1]; // next one
+    $prev = $index[$last]; // last one
+  } else { // somewhere in the middle
+    $next = $index[$id+1];
+    $prev = $index[$id-1];
+  }
+  if( $go == "p" ) {
+    $go_url = $web_ring[$prev];
+  } else if( $go == "n" ) {
+    $go_url = $web_ring[$next];
   }
 }
 
-// Onward
-
-$prev = "";
-$rand = "";
-$next = "";
-
-if( $id == $last ) { // are we at the end?
-  $next = $index[0]; // first one
-  $prev = $index[$id-1]; // previous one
-} else if( $id == 0 ) { // are we at the beginning?
-  $next = $index[$id+1]; // next one
-  $prev = $index[$last]; // last one
-} else { // somewhere in the middle
-  $next = $index[$id+1];
-  $prev = $index[$id-1];
-}
-
-$rand = $index[rand(0,$last)];
-
-$home_url = $web_ring[$index[0]];
-$rand_url = $web_ring[$rand];
-$prev_url = $web_ring[$prev];
-$next_url = $web_ring[$next]
+header( "Location: $go_url" );
 
 ?>