feat: Add IPNS support

lib/handshake.js

@@ -9,7 +9,8 @@ const {
   LOCAL_RESOLVER_HOST, 
   LOCAL_RESOLVER_PORT, 
   CACHE_ENABLED, 
-  CACHE_TTL_SECONDS 
+  CACHE_TTL_SECONDS,
+  IPFS_GATEWAY 
 } = config;
 
 // Setup cache
@@ -18,6 +19,12 @@ const cache = new NodeCache({
   checkperiod: CACHE_TTL_SECONDS * 0.2,
 });
 
+// Setup separate cache for IPNS with shorter TTL (IPNS can change more frequently)
+const ipnsCache = new NodeCache({
+  stdTTL: Math.min(CACHE_TTL_SECONDS, 300), // Max 5 minutes for IPNS
+  checkperiod: 60,
+});
+
 /**
  * Resolve a Handshake domain to an IPFS CID
  * @param {string} domain - The Handshake domain to resolve
@@ -299,14 +306,14 @@ async function resolveLocal(domain) {
 /**
  * Extract IPFS CID from DNS TXT records
  * @param {string[][]} records - Array of TXT record arrays
- * @returns {string|null} - IPFS CID or null
+ * @returns {Promise<string|null>} - IPFS CID or IPNS hash or null
  */
-function extractCidFromRecords(records) {
+async function extractCidFromRecords(records) {
   if (!records || !records.length) {
     return null;
   }
   
-  // Flatten and look for ipfs= or ip6= prefixes
+  // Flatten and look for ipfs=, ip6=, or ipns= prefixes
   for (const recordSet of records) {
     for (const record of recordSet) {
       // Support multiple formats
@@ -319,6 +326,18 @@ function extractCidFromRecords(records) {
       if (record.startsWith('ip6=')) {
         return record.substring(4);
       }
+      if (record.startsWith('ipns=')) {
+        const ipnsName = record.substring(5);
+        console.log(`Found IPNS record: ${ipnsName}`);
+        // Return IPNS hash prefixed with 'ipns:' to distinguish from IPFS CID
+        return `ipns:${ipnsName}`;
+      }
+      if (record.startsWith('ipns:')) {
+        const ipnsName = record.substring(5);
+        console.log(`Found IPNS record: ${ipnsName}`);
+        // Return IPNS hash prefixed with 'ipns:' to distinguish from IPFS CID
+        return `ipns:${ipnsName}`;
+      }
       
       // Log the record for debugging
       console.log(`Found TXT record: ${record}`);
@@ -328,7 +347,6 @@ function extractCidFromRecords(records) {
   return null;
 }
 
-
 /**
  * Clear the cache for a specific domain
  * @param {string} domain - The Handshake domain to clear from cache
@@ -340,7 +358,46 @@ function clearCache(domain) {
   }
 }
 
+/**
+ * Clear IPNS cache for a specific IPNS name (keeping for API compatibility)
+ * @param {string} ipnsName - The IPNS name to clear from cache
+ */
+function clearIpnsCache(ipnsName) {
+  // Since we're not caching IPNS resolutions anymore, just log
+  console.log(`IPNS cache clear requested for ${ipnsName} (no-op)`);
+}
+
+/**
+ * Clear the cache for a specific domain
+ * @param {string} domain - The Handshake domain to clear from cache
+ */
+function clearCache(domain) {
+  if (CACHE_ENABLED) {
+    cache.del(`hns:${domain}`);
+    // Also clear any IPNS cache entries that might be related
+    const keys = ipnsCache.keys();
+    keys.forEach(key => {
+      if (key.includes(domain)) {
+        ipnsCache.del(key);
+      }
+    });
+    console.log(`Cache cleared for ${domain}`);
+  }
+}
+
+/**
+ * Clear IPNS cache for a specific IPNS name
+ * @param {string} ipnsName - The IPNS name to clear from cache
+ */
+function clearIpnsCache(ipnsName) {
+  if (CACHE_ENABLED) {
+    ipnsCache.del(`ipns:${ipnsName}`);
+    console.log(`IPNS cache cleared for ${ipnsName}`);
+  }
+}
+
 module.exports = {
   resolveHandshake,
-  clearCache
+  clearCache,
+  clearIpnsCache
 };