Adds API endpoints for native whois lookup on domain

netlify.toml

@@ -109,6 +109,11 @@
   to = "/.netlify/functions/check-hsts"
   status = 301
   force = true
+[[redirects]]
+  from = "/whois-lookup"
+  to = "/.netlify/functions/whois-lookup"
+  status = 301
+  force = true
 
 # For router history mode, ensure pages land on index
 [[redirects]]

server/lambda/whois-lookup.js

@@ -0,0 +1,96 @@
+const net = require('net');
+const { URL } = require('url');
+
+exports.handler = async function(event, context) {
+  let url = event.queryStringParameters.url;
+
+  if (!url) {
+    return {
+      statusCode: 400,
+      body: JSON.stringify({ message: 'A url query parameter is required' }),
+    };
+  }
+
+  if (!url.startsWith('http://') && !url.startsWith('https://')) {
+    url = 'http://' + url;
+  }
+
+  let hostname;
+  try {
+    hostname = new URL(url).hostname;
+  } catch (error) {
+    return {
+      statusCode: 400,
+      body: JSON.stringify({ message: 'Invalid url provided' }),
+    };
+  }
+
+  return new Promise((resolve, reject) => {
+    const client = net.createConnection({ port: 43, host: 'whois.internic.net' }, () => {
+      client.write(hostname + '\r\n');
+    });
+
+    let data = '';
+    client.on('data', (chunk) => {
+      data += chunk;
+    });
+
+    client.on('end', () => {
+      try {
+        const parsedData = parseWhoisData(data);
+        resolve({
+          statusCode: 200,
+          body: JSON.stringify(parsedData),
+        });
+      } catch (error) {
+        resolve({
+          statusCode: 500,
+          body: JSON.stringify({ error: error.message }),
+        });
+      }
+    });
+
+    client.on('error', (err) => {
+      resolve({
+        statusCode: 500,
+        body: JSON.stringify({ message: err.message }),
+      });
+    });
+  });
+};
+
+const parseWhoisData = (data) => {
+  const lines = data.split('\r\n');
+  const parsedData = {};
+
+  let lastKey = '';
+
+  for (const line of lines) {
+    const index = line.indexOf(':');
+
+    // If this line is a continuation of the previous line
+    if (index === -1) {
+      if (lastKey !== '') {
+        parsedData[lastKey] += ' ' + line.trim();
+      }
+      continue;
+    }
+
+    let key = line.slice(0, index).trim();
+    const value = line.slice(index + 1).trim();
+
+    // Ignore lines that are not key-value pairs
+    if (value.length === 0) continue;
+
+    // Convert keys to format without spaces or special characters
+    key = key.replace(/\W+/g, '_');
+
+    // Store the key to handle multi-line values
+    lastKey = key;
+
+    parsedData[key] = value;
+  }
+
+  return parsedData;
+};
+