Resolve the Seafile host over IPv4 only (musl/Alpine ENOTFOUND on IPv6 NXDOMAIN); v2.17.3

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "siteforge",
-  "version": "2.17.2",
+  "version": "2.17.3",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "siteforge",
-      "version": "2.17.2",
+      "version": "2.17.3",
       "dependencies": {
         "@aws-sdk/client-s3": "^3.1135.0",
         "@dnd-kit/core": "^6.3.1",

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "2.17.2",
+  "version": "2.17.3",
   "type": "module",
   "scripts": {
     "dev": "vite",

server.js

@@ -67,6 +67,7 @@ import { register as registerNuggets } from './server/routes/nuggets.js'
 import { register as registerNuggetsHostUpload } from './server/routes/nuggets-host-upload.js'
 import { register as registerNuggetsWorkflow } from './server/routes/nuggets-workflow.js'
 import { register as registerPodcastWorkflow } from './server/routes/podcast-workflow.js'
+import { preferIpv4ForSeafile } from './server/seafile-dns.js'
 import { startNuggetsSeafileWatcher } from './server/nuggets-seafile-watcher.js'
 import { register as registerFeed } from './server/routes/feed.js'
 import { register as registerQrCodes } from './server/routes/qr-codes.js'
@@ -74,6 +75,8 @@ import { register as registerBiblePassage } from './server/routes/bible-passage.
 import { register as registerNewsletter } from './server/routes/newsletter.js'
 import { register as registerPublic } from './server/routes/public.js'
 
+preferIpv4ForSeafile()
+
 const app = express()
 app.use(express.json({ limit: '10mb' }))
 const trustProxyHops = Number(process.env.TRUST_PROXY_HOPS ?? 1)

server/seafile-dns.js

@@ -0,0 +1,30 @@
+import dns from 'node:dns'
+import { SEAFILE_URL } from './config.js'
+
+// Alpine's resolver (musl) fails the whole lookup when a DNS server answers the IPv6 (AAAA)
+// query with "no such name" even though the IPv4 answer is fine, so Node reports ENOTFOUND for
+// a host that resolves. Ask for IPv4 only, and only for the Seafile host.
+export function preferIpv4ForSeafile() {
+  let host = ''
+  try {
+    host = SEAFILE_URL ? new URL(SEAFILE_URL).hostname : ''
+  } catch {
+    return
+  }
+  if (!host) return
+
+  const originalLookup = dns.lookup
+  dns.lookup = function lookup(hostname, options, callback) {
+    if (hostname === host) {
+      if (typeof options === 'function') {
+        callback = options
+        options = {}
+      } else if (typeof options === 'number') {
+        options = { family: options }
+      }
+      if (!options?.family) options = { ...options, family: 4 }
+    }
+    return originalLookup.call(this, hostname, options, callback)
+  }
+  console.log(`[seafile-dns] resolving ${host} over IPv4 only`)
+}