toLowerCase domains on punycode convert (uppercase "not a legal IDNA2008 name")

src/controllers/dns.controller.ts

@@ -13,6 +13,10 @@ function catcher(x) {
   return;
 }
 
+function punyCodeLower(input: string): string {
+  return punycode.toASCII(punycode.toUnicode(input).toLowerCase());
+}
+
 /**
  * Index
  */
@@ -22,36 +26,49 @@ router.get("/:domain", (req: Request, res: Response, next: NextFunction) => {
   if(isIp(asciiDomain)) {
     res.redirect(301, `/ip/${asciiDomain}`);
   } else if(domainNameRegex.test(asciiDomain) || isDomainName(asciiDomain)) {
-    axios.get(`https://api.telcodb.net/v1/resolve?format=json&q=${asciiDomain}`)
-      .then((response) => {
-        Promise.all([
-          getIpInfo(response.data).catch(catcher)
-        ])
-          .then(x => x[0])
-          .then(ipInfo => {
-            // Nullify IP info if undefined
-            if(ipInfo[0] == undefined) {
-              ipInfo = null;
-            }
-
-            const unicodeDomain = punycode.toUnicode(asciiDomain);
-
-            res.render("dns/show.twig", {
-              "title": `${unicodeDomain} - DNS data`,
-              "disable_title_prefix": true,
-
-              "canonical_url": `/dns/${asciiDomain}`,
-        
-              "asciiDomain": asciiDomain,
-              "unicodeDomain": unicodeDomain,
-        
-              "data": response.data,
-
-              "ipInfo": ipInfo,
+    if(asciiDomain.toLowerCase() != asciiDomain) {
+      res.redirect(`/dns/${asciiDomain.toLowerCase()}`);
+    } else if(punyCodeLower(asciiDomain) !== asciiDomain) {
+      /**
+       * Example: https://telcodb.net/dns/xn--ggle-lmaa.com ("gÖÖgle.com")
+       *
+       * dig: 'xn--ggle-lmaa.com' is not a legal IDNA2008 name (domain label has character forbidden in non-transitional mode (TR46)), use +noidnin
+       *
+       * "dig gÖÖgle.com" returns results for xn--ggle-5qaa.com
+       */
+      res.redirect(301, `/dns/${punyCodeLower(asciiDomain)}`);
+    } else {
+      axios.get(`https://api.telcodb.net/v1/resolve?format=json&q=${asciiDomain}`)
+        .then((response) => {
+          Promise.all([
+            getIpInfo(response.data).catch(catcher)
+          ])
+            .then(x => x[0])
+            .then(ipInfo => {
+              // Nullify IP info if undefined
+              if(ipInfo[0] == undefined) {
+                ipInfo = null;
+              }
+
+              const unicodeDomain = punycode.toUnicode(asciiDomain);
+
+              res.render("dns/show.twig", {
+                "title": `${unicodeDomain} - DNS data`,
+                "disable_title_prefix": true,
+
+                "canonical_url": `/dns/${asciiDomain}`,
+          
+                "asciiDomain": asciiDomain,
+                "unicodeDomain": unicodeDomain,
+          
+                "data": response.data,
+
+                "ipInfo": ipInfo,
+              });
             });
-          });
-      })
-      .catch(next);
+        })
+        .catch(next);
+      }
   } else if(isIdn(asciiDomain)) {
     res.redirect(`/dns/${punycode.toASCII(asciiDomain)}`)
   } else {

src/controllers/search.controller.ts

@@ -38,7 +38,7 @@ router.get("/", (req: Request, res: Response, next: NextFunction) => {
     } else if(isCidr(query)) {
       res.redirect(`/net/${query}`);
     } else if(domainNameRegex.test(punycode.toASCII(query))) {
-      res.redirect(`/dns/${punycode.toASCII(query)}`);
+      res.redirect(`/dns/${punycode.toASCII(query.toLowerCase())}`);
     } else {
       let skip_tld_check: boolean = false;