move config options to config file, add option to diable frontend

backend/src/config.ts

@@ -0,0 +1,28 @@
+export interface Config {
+  port: number;
+  apiBasePath: string;
+  disableDefaultApiEndpoint: boolean;
+  trustProxy: string | boolean;
+}
+
+export default function appConfig(): Config {
+  const {
+    PORT,
+    BASE_PATH,
+    TRUST_PROXY,
+    DISABLE_DEFAULT_API_ENDPOINT,
+  } = process.env;
+
+  let trustProxy: string | boolean = false;
+
+  if (TRUST_PROXY == '*') {
+    trustProxy = true;
+  }
+
+  return {
+    port: Number(PORT ?? 3000),
+    apiBasePath: BASE_PATH ?? '',
+    trustProxy,
+    disableDefaultApiEndpoint: DISABLE_DEFAULT_API_ENDPOINT == 'true',
+  };
+}