HSTS Preload DNS list, other minor improvements

src/controllers/dns.controller.ts

@@ -24,6 +24,11 @@ router.get("/:domain", (req: Request, res: Response, next: NextFunction) => {
         ])
           .then(x => x[0])
           .then(ipInfo => {
+            // Nullify IP info if undefined
+            if(ipInfo[0] == undefined) {
+              ipInfo = null;
+            }
+
             res.render("dns/show.twig", {
               "title": `${req.params.domain} - DNS data`,
               "disable_title_prefix": true,

src/controllers/home.controller.ts

@@ -29,4 +29,11 @@ router.get("/docs/", (req: Request, res: Response, next: NextFunction) => {
   });
 });
 
+router.get("/docs/dns-hsts-preloading/", (req: Request, res: Response, next: NextFunction) => {
+  res.render("docs/dns-hstspreload.twig", {
+    "canonical_url": "/docs/dns-hsts-preloading/",
+    "title": "DNS list for HSTS preloaded domains",
+  });
+});
+
 export const HomeController: Router = router;

src/controllers/net.controller.ts

@@ -50,7 +50,7 @@ router.get("/:zero/:one([0-9][0-9]?[0-9]?)", (req: Request, res: Response, next:
           cidrNotation,
           ipVersion,
 
-          addresses: addresses,
+          // addresses: addresses,
 
           announcements,
         });

views/dns/show.twig

@@ -102,9 +102,11 @@
         src="https://screenshots.lelux.fi/api/png?url=http://{{ domain }}" />
     </div> #}
     {% endif %}
+    {% if ipInfo %}
     <div class="tab-pane fade" id="ip-info" role="tabpanel" aria-labelledby="ip-info-tab">
       {% include "../components/ip-info.twig" %}
     </div>
+    {% endif %}
     <div class="tab-pane fade" id="whois" role="tabpanel" aria-labelledby="whois-tab">
       <pre class="mt-2 mb-0"><code id="whoisInformation"></code></pre>
     </div>

views/docs/dns-hstspreload.twig

+{% extends 'layouts/default.twig' %}
+
+{% block body %}
+  <h1>DNS list for <a href="https://hstspreload.org/">HSTS preloaded domains</a></h1>
+
+  <p>This list is technically similar to <a href="https://en.wikipedia.org/wiki/DNSBL#URI_DNSBLs">URIBLs</a>.</p>
+
+  <p><a href="https://gitlab.lelux.fi/TelcoDB/hsts-preload-dns">The source code is available on GitLab</a>.</p>
+
+  <h2>Technical details</h2>
+
+  <p>The service is available under <code>chromium.hstspreload.lelux.fi</code>.</p>
+
+  <p>A query returns <code>127.0.0.42</code> if the domain is HSTS preloaded.
+    If it is not preloaded, <a href="https://tools.ietf.org/html/rfc8020">NXDOMAIN</a> is returned.</p>
+
+  <h3>Example</h3>
+
+  <pre><code>$ dig +short <a href="/dns/httpforever.com.chromium.hstspreload.lelux.fi"
+    class="text-dark">httpforever.com.chromium.hstspreload.lelux.fi</a>
+$ dig +short <a href="/dns/mail.google.com.chromium.hstspreload.lelux.fi" class="text-dark">mail.google.com.chromium.hstspreload.lelux.fi
+<a class="text-dark" href="/ip/127.0.0.42">127.0.0.42</a></code></pre>
+
+  <h3>Guidelines</h3>
+
+  <ul>
+    <li>We recommend you to self-host the preloading list, if possible.</li>
+    <li>No warranty of any kind is provided.</li>
+  </ul>
+
+  <hr>
+
+  <p><a href="/docs/">Go back to documentation</a></p>
+{% endblock %}
\ No newline at end of file

views/docs/index.twig

@@ -70,6 +70,12 @@ location: https://peeringdb.com/api/net/291</code></pre>
 
   {# <p>We couldn't understand why it couldn't be implemented <a href="https://peeringdb.com/apidocs/">natively in the PeeringDB API</a>...</p> #}
 
+  <h2>DNS lists</h2>
+
+  <ul>
+    <li><a href="/docs/dns-hsts-preloading/">DNS list for HSTS preloaded domains</a></li>
+  </ul>
+
   <h2>DNS-over-HTTPS</h2>
 
   <ul>

views/net/show.twig

@@ -12,7 +12,7 @@
       <a class="nav-link" data-toggle="tab" role="tab"
         id="whois-tab" href="#whois" aria-controls="whois" aria-selected="false">Whois</a>
     </li>
-    {% if ipVersion == 4 %}
+    {% if addresses and ipVersion == 4 %}
       <li class="nav-item">
         <a class="nav-link" data-toggle="tab" role="tab"
           id="dns-tab" href="#dns" aria-controls="dns" aria-selected="false">DNS</a>
@@ -52,7 +52,7 @@
     <div class="tab-pane fade" id="whois" role="tabpanel" aria-labelledby="whois-tab">
       <pre class="mt-2 mb-0"><code id="whoisInformation"></code></pre>
     </div>
-    {% if ipVersion == 4 %}
+    {% if addresses and ipVersion == 4 %}
       <div class="tab-pane fade" id="dns" role="tabpanel" aria-labelledby="dns-tab">
         <table class="table w-auto">
           <thead>