feat: reverse proxy configuration (#614)

* feat: reverse proxy configuration

* chore: changeset

* chore(wilbur): Fixing linting issues.

---------

Co-authored-by: Matthew.Cotton <matt@tensorworks.com.au>

Author: skymoore

.changeset/red-turtles-cross.md

@@ -0,0 +1,12 @@
+---
+'@epicgames-ps/wilbur': minor
+---
+
+Adds command line options to wilbur to allow for configuring the reverse proxy:
+
+--reverse-proxy Enables reverse proxy mode. This will
+trust the X-Forwarded-For header.
+(default: false)
+--reverse-proxy-num-proxies <number> Sets the number of proxies to trust.
+This is used to calculate the real
+client IP address. (default: 1)

SignallingWebServer/config.json

@@ -14,8 +14,10 @@
 	"ssl_cert_path": "certificates/client-cert.pem",
 	"https_redirect": true,
 	"rest_api": false,
+	"reverse_proxy": false,
+	"reverse_proxy_num_proxies": 1,
 	"peer_options": "",
 	"log_config": true,
 	"stdin": false,
 	"console_messages": "verbose"
-}
+}

SignallingWebServer/src/index.ts

@@ -147,6 +147,19 @@ program
             .argParser(JSON.parse)
             .default(config_file.peer_options || '')
     )
+    .option(
+        '--reverse-proxy',
+        'Enables reverse proxy mode. This will trust the X-Forwarded-For header.',
+        config_file.reverse_proxy || false
+    )
+    .addOption(
+        new Option(
+            '--reverse-proxy-num-proxies <number>',
+            'Sets the number of proxies to trust. This is used to calculate the real client IP address.'
+        )
+            .implies({ reverse_proxy: true })
+            .default(config_file.reverse_proxy_num_proxies || 1)
+    )
     .option(
         '--log_config',
         'Will print the program configuration on startup.',
@@ -197,6 +210,9 @@ if (options.log_config) {
 }
 
 const app = express();
+if (options.reverse_proxy) {
+    app.set('trust proxy', options.reverse_proxy_num_proxies);
+}
 
 const serverOpts: IServerConfig = {
     streamerPort: options.streamer_port,