use sni-based routing with nginx for web,api,caldav, and carddav

Author: flaviomartins

self-hosting/docker-compose-self-hosted.yml

@@ -1,4 +1,11 @@
 services:
+  nginx:
+    image: nginx:stable
+    container_name: sni-router
+    network_mode: host
+    volumes:
+      - ./nginx.conf:/etc/nginx/nginx.conf:ro
+    restart: unless-stopped
   web:
     image: ghcr.io/forwardemail/forwardemail.net-selfhosted:latest
     container_name: web

self-hosting/nginx.conf

@@ -0,0 +1,53 @@
+worker_rlimit_nofile 65535;
+worker_processes auto;
+
+events {
+  worker_connections 8192;
+  multi_accept on;
+}
+
+# This stream block is acting as a pass-through proxy based on SNI.
+# - Each upstream service (web, api, caldav, carddav) still handles TLS.
+stream {
+  # Fail fast. This applies to all upstreams (web, api, caldav, carddav).
+  proxy_connect_timeout 5s;
+
+  # Accommodate large headers/cookies in the initial response chunk
+  proxy_buffer_size 16k;
+
+  # Enable TCP keepalive to detect dead connections and prevent timeouts
+  proxy_socket_keepalive on;
+
+  map $ssl_preread_server_name $backend {
+    # carddav.example.com, caldav.example.com, api.example.com
+    ~^carddav\.   carddav;
+    ~^caldav\.    caldav;
+    ~^api\.       api;
+    # example.com and any other hostname
+    default       web;
+  }
+
+  server {
+    listen 443;
+    listen [::]:443;
+
+    ssl_preread on;  # Use SNI information to route to correct backend
+    proxy_pass $backend;
+  }
+
+  upstream web {
+    server 127.0.0.1:3000;
+  }
+
+  upstream api {
+    server 127.0.0.1:4000;
+  }
+
+  upstream caldav {
+    server 127.0.0.1:5000;
+  }
+
+  upstream carddav {
+    server 127.0.0.1:6000;
+  }
+}

self-hosting/setup.sh

@@ -473,9 +473,9 @@ update_env_file() {
 update_default_env() {
   update_env_file NODE_ENV production
   update_env_file HTTP_PROTOCOL https
-  update_env_file SQLITE_HOST sqlite.{{DOMAIN}}
+  update_env_file WEB_URL https://{{DOMAIN}}
   update_env_file WEB_HOST {{DOMAIN}}
-  update_env_file WEB_PORT 443
+  update_env_file SQLITE_HOST sqlite.{{DOMAIN}}
   update_env_file CALDAV_HOST caldav.{{DOMAIN}}
   update_env_file CARDDAV_HOST carddav.{{DOMAIN}}
   update_env_file API_HOST api.{{DOMAIN}}