.

frontend/src/services/common.service.ts

@@ -0,0 +1,23 @@
+import { Injectable } from '@angular/core'
+
+
+@Injectable({ providedIn: 'root' })
+export class CommonService {
+    private configPromise: Promise<any>
+    backendURL$: Promise<string>
+
+    constructor () {
+        this.configPromise = this.getConfig()
+        this.backendURL$ = this.configPromise.then(cfg => {
+            let backendURL = cfg.backendURL
+            if (backendURL.endsWith('/')) {
+                backendURL = backendURL.slice(0, -1)
+            }
+            return backendURL
+        })
+    }
+
+    private async getConfig () {
+        return (await fetch('/config.json')).json()
+    }
+}