fix: corrected router's code

.ci/.autoRedirect

@@ -15,54 +15,69 @@
         });
     }
 
-    // define URLs
-    var internalURL = 'https://r3-core.pages.uni.lu/howto-cards-internal';
-    var externalURL = 'https://r3.pages.uni.lu/howto-cards';
-
-    UrlExists(internalURL+'/index.html', function(status){
+    function GetShortcutDestination() {
         var s = window.location.href;
         var pathArray = s.split('?');
 
-        // cut the query if it exists
+        // Cut the query if it exists
         if (pathArray.length > 1) {
-            sub = pathArray[1];
+            return pathArray[1];
         } else {
-            sub = '';
+            return '';
         }
+    }
+
+    // Pick the shortcut link destination from URL, like: `category:subcategory:card-name`
+    var sub = GetShortcutDestination();
 
+    // Define URLs
+    var internalPortalURL = 'https://r3-core.pages.uni.lu/howto-cards-internal';
+    var externalPortalURL = 'https://r3.pages.uni.lu/howto-cards';
+
+    // First, check whether internal pages are accessible...
+    var internalIndexURL = internalPortalURL + '/index.html';
+    UrlExists(internalIndexURL, function(status){
         if(status === 200){
-            // internal pages
+            // If the internal pages are accessible, try to redirect into correct page
             if (sub.length > 0) {
-                UrlExists(internalURL+'/stable/internal/'+sub, function(status){
-                    if (status == 200) { // if sub-card is internal in the internal directory and exists
-                        window.location.href = internalURL+'/stable/internal/cards/'+sub;
+                var internalCardURL = internalPortalURL + '/stable/internal/cards/' + sub;
+                UrlExists(internalCardURL, function(status){
+                    if (status == 200) { // The sub-card is internal, and is accessible
+                        window.location.href = internalCardURL;
                     } else {
-                        UrlExists(internalURL+'/stable/external/'+sub, function(status){
+                        UrlExists(internalPortalURL + '/stable/external/' + sub, function(status){
                             if (status == 200) { // if sub-card is internal in the external directory and exists
-                                window.location.href = internalURL+'/stable/external/cards/'+sub;
+                                window.location.href = internalPortalURL + '/stable/external/cards/' + sub;
                             } else {
-                                window.location.href = internalURL+'/stable/404.html';
+                                window.location.href = internalPortalURL + '/stable/404.html';
                             }
                         });
                     }
                 });
-            } else {
-                UrlExists(internalURL+'/stable', function(status){
-                    if (status == 200) { // if card is internal and exists
-                        window.location.href = internalURL+'/stable';
+            } else { 
+                // The user did not request specific card, redirect him just to the stable index
+                var internalPortalIndexURL = internalPortalURL + '/stable';
+                var internalPortal404URL = internalPortalURL + '/stable/404.html';
+                UrlExists(internalPortalIndexURL, function(status){
+                    if (status == 200) { // if page is accessible
+                        window.location.href = internalPortalIndexURL;
                     } else {
-                        window.location.href = internalURL+'/stable/404.html';
+                        window.location.href = internalPortal404URL;
                     }
                 });
             }
-        // external pages
         } else {
-            if (sub.length > 0) { sub = 'external/'+sub; }
-            UrlExists(externalURL+'/stable/cards/'+sub, function(status){
+            // The internal pages are not accessible, therefore the user is redirected into correct external page
+            if (sub.length > 0) {
+                sub = 'external/cards/' + sub;
+            }
+            var externalPortalCardURL = externalPortalURL + '/stable/' + sub;
+            var externalPortal404URL = externalPortalURL + '/stable/404.html';
+            UrlExists(externalPortalURL + '/stable/' + sub, function(status){
                 if (status == 200) { // if sub-card is internal and exists
-                    window.location.href = externalURL+'/stable/cards/'+sub;
+                    window.location.href = externalPortalCardURL;
                 } else {
-                    window.location.href = externalURL+'/stable/404.html';
+                    window.location.href = externalPortal404URL;
                 }
             });
         }