fix(docker): resolve OG image ECONNREFUSED and EXIF WASM 404 in Docker

Closes #196

Author: Innei

Dockerfile

@@ -20,6 +20,12 @@ RUN sh ./scripts/preinstall.sh
 # Install all dependencies
 RUN pnpm install --frozen-lockfile
 
+# Copy zeroperl.wasm to web public directory before build.
+# @uswriting/exiftool depends on @6over3/zeroperl-ts which loads zeroperl.wasm via fetch("./zeroperl.wasm")
+# relative to the current page URL, so it must be available under both root and /photos/ paths.
+RUN mkdir -p apps/web/public/photos && \
+    find node_modules -name "zeroperl.wasm" -path "*/esm/*" -exec cp {} apps/web/public/ \; -exec cp {} apps/web/public/photos/ \; -quit
+
 ARG S3_ACCESS_KEY_ID
 ARG S3_SECRET_ACCESS_KEY
 ARG GIT_TOKEN

apps/ssr/src/app/og/[photoId]/route.tsx

@@ -1,10 +1,20 @@
+import { hostname } from 'node:os'
+
 import type { NextRequest } from 'next/server'
 
+function getDefaultCoreApiBase(): string {
+  // In Docker, HOSTNAME is set to the container ID, and localhost may not resolve correctly (IPv6 issues).
+  // Use os.hostname() which is resolvable within the Docker network.
+  const isDocker = process.env.HOSTNAME && /^[a-f0-9]{12,64}$/.test(process.env.HOSTNAME)
+  const host = isDocker ? hostname() : 'localhost'
+  return `http://${host}:3000`
+}
+
 const CORE_API_BASE =
   process.env.CORE_API_URL ??
   process.env.NEXT_PUBLIC_CORE_API_URL ??
   process.env.API_BASE_URL ??
-  'http://localhost:3000'
+  getDefaultCoreApiBase()
 
 const FORWARDED_HEADER_KEYS = ['cookie', 'authorization', 'x-forwarded-host', 'x-forwarded-proto', 'host']