Rework ConfigService to load backend url from config.json only for pr…

.devcontainer/devcontainer.json

@@ -34,7 +34,6 @@
 
   "remoteEnv": {
     "NODE_OPTIONS": "--use-openssl-ca",
-    "HASHTOPOLIS_BACKEND_URL": "http://localhost:8080"
   },
   "overrideCommand": false,
   "remoteUser": "node"

src/app/core/_services/shared/config.service.ts

@@ -1,53 +1,86 @@
+import { Observable, of } from 'rxjs';
+import { environment } from 'src/environments/environment';
+
 import { HttpClient } from '@angular/common/http';
 import { Injectable } from '@angular/core';
-import { Observable } from 'rxjs';
-import { environment } from 'src/environments/environment';
+
+/**
+ * Interface for the expected shape of `assets/config.json`.
+ */
+interface AppConfig {
+  hashtopolis_backend_url?: string;
+}
 
 @Injectable({
   providedIn: 'root'
 })
 export class ConfigService {
   private configUrl = 'assets/config.json';
-  constructor(private http: HttpClient) { }
 
-  private getConfigOnce(): Observable<any> {
+  constructor(private http: HttpClient) {}
+
+  /**
+   * Retrieves the configuration file once from the assets folder.
+   *
+   * - In **production**, this fetches `assets/config.json` (created at container startup).
+   * - In **development**, this bypasses the HTTP request and just returns `null`,
+   *   because dev uses `environment.ts` instead of `config.json`.
+   *
+   * @returns An observable of the parsed JSON config (prod) or `null` (dev).
+   */
+  private getConfigOnce(): Observable<AppConfig> {
+    if (!environment.production) {
+      return of(null);
+    }
     return this.http.get(this.configUrl);
   }
 
-  public refreshEndpoint(){
-    let ApiEndPoint = "";
-    this.getConfigOnce().subscribe(config => {
-      // Assuming the JSON contains a property named 'backendUrl'
-      if (config && config.hashtopolis_backend_url) {
-        // If we get a config from the backend, we set the config property
-        ApiEndPoint = config.hashtopolis_backend_url;
-        // Remove trailing slash, because this causing invalid URLs
-        if (ApiEndPoint.endsWith('/')) {
-          ApiEndPoint = ApiEndPoint.slice(0, -1);
+  /**
+   * Refreshes the API endpoint configuration.
+   *
+   * - In **production**, it tries to read `hashtopolis_backend_url` from `config.json`.
+   *   If found, it is saved to `localStorage`.
+   *   If missing or invalid, falls back to `environment.config.prodApiEndpoint`.
+   *
+   * - In **development**, it always uses `environment.config.prodApiEndpoint`
+   *   and stores it in `localStorage`.
+   */
+  public refreshEndpoint(): void {
+    let ApiEndPoint = '';
+    this.getConfigOnce().subscribe({
+      next: (config) => {
+        if (config && config.hashtopolis_backend_url) {
+          ApiEndPoint = config.hashtopolis_backend_url;
+          if (ApiEndPoint.endsWith('/')) {
+            ApiEndPoint = ApiEndPoint.slice(0, -1);
+          }
+        } else {
+          ApiEndPoint = environment.config.prodApiEndpoint;
         }
         localStorage.setItem('prodApiEndpoint', ApiEndPoint);
-      } else if (config && !config.hashtopolis_backend_url) {
-        console.error('Invalid configuration file. Please check your config.json. Using defaults.');
-        ApiEndPoint = environment.config.prodApiEndpoint;
-        localStorage.setItem('prodApiEndpoint', ApiEndPoint);
-      } else {
+      },
+      error: () => {
         ApiEndPoint = environment.config.prodApiEndpoint;
         localStorage.setItem('prodApiEndpoint', ApiEndPoint);
       }
-    },
-    error => {
-      ApiEndPoint = environment.config.prodApiEndpoint;
-      localStorage.setItem('prodApiEndpoint', ApiEndPoint);
-    }
-    );
+    });
   }
 
-  public getEndpoint(){
+  /**
+   * Retrieves the currently configured API endpoint.
+   *
+   * - If an endpoint is already stored in `localStorage`, returns it.
+   * - If not, it triggers `refreshEndpoint()` to initialize it and then returns
+   *   either the stored value or falls back to `environment.config.prodApiEndpoint`.
+   *
+   * @returns The active API endpoint as a string.
+   */
+  public getEndpoint(): string {
     let ApiEndPoint = localStorage.getItem('prodApiEndpoint');
     if (!ApiEndPoint) {
       this.refreshEndpoint();
+      ApiEndPoint = localStorage.getItem('prodApiEndpoint');
     }
-    ApiEndPoint = localStorage.getItem('prodApiEndpoint');
-    return ApiEndPoint;
+    return ApiEndPoint ?? environment.config.prodApiEndpoint;
   }
 }