read backend api url from environment variables

.github/workflows/deploy.prod-env.yml

@@ -26,5 +26,5 @@ jobs:
             docker pull git.wohlleben.dev/itob/rbl-news-webapp:latest
             docker stop rbl-news-webapp
             docker rm rbl-news-webapp        
-            docker run --init -d --name rbl-news-webapp -p 8000:8080 --restart=always git.wohlleben.dev/itob/rbl-news-webapp:latest 
+            docker run --init -d --name rbl-news-webapp -p 8000:8080 -e RblApiUrl=${{ vars.RBL_PROD_ENV_API_URL }} --restart=always git.wohlleben.dev/itob/rbl-news-webapp:latest 
             docker system prune -af

.github/workflows/deploy.test-env.yml

@@ -40,5 +40,5 @@ jobs:
             docker pull git.wohlleben.dev/itob/rbl-news-webapp:latest
             docker stop rbl-news-webapp
             docker rm rbl-news-webapp
-            docker run --init -d --name rbl-news-webapp -p 8000:8080 --restart=always git.wohlleben.dev/itob/rbl-news-webapp:latest
+            docker run --init -d --name rbl-news-webapp -p 8000:8080 -e RblApiUrl=${{ vars.RBL_TEST_ENV_API_URL }} --restart=always git.wohlleben.dev/itob/rbl-news-webapp:latest
             docker system prune -af

RBLNews.Maui/MauiProgram.cs

@@ -31,7 +31,20 @@ namespace RBLNews.Maui
             builder.Logging.AddDebug();
 #endif
             
-            return builder.Build();
+            MauiApp app = builder.Build();
+
+            using var serviceScope = app.Services.CreateScope();
+            var services = serviceScope.ServiceProvider;
+
+            var environmentVariablesService = services.GetRequiredService<EnvironmentVariablesService>();
+            string? backendApiUrl = environmentVariablesService.RblApiUrl;
+
+            if (string.IsNullOrEmpty(backendApiUrl))
+            {
+                throw new Exception($"can't instantiate services, due to paramters are null. backendApiUrl: '{backendApiUrl}'");
+            }
+
+            return app;
         }
     }
 }

RBLNews.Shared/Services/EnvironmentVariablesService.cs

@@ -0,0 +1,6 @@
+namespace RBLNews.Shared.Services;
+
+public class EnvironmentVariablesService
+{
+	public string? RblApiUrl => Environment.GetEnvironmentVariable("RblApiUrl");
+}

RBLNews.Shared/Services/FeedDataService.cs

@@ -15,15 +15,23 @@ namespace RBLNews.Shared.Services
 
     public class FeedDataService : IFeedDataService
     {
+        private readonly EnvironmentVariablesService _environmentVariablesService;
+
         private static readonly HttpClient httpClient = new();
 
         public RssVM Feeds { get; private set; }
         
         public Action DataChanged { get; set; }
 
+
+        public FeedDataService(EnvironmentVariablesService environmentVariablesService)
+        {
+            this._environmentVariablesService = environmentVariablesService;
+        }
+        
         public async Task LoadFeeds()
         {
-            Feeds = await httpClient.GetFromJsonAsync<RssVM>("https://rblnews.de/api/feeds") ?? new RssVM();
+            Feeds = await httpClient.GetFromJsonAsync<RssVM>($"{this._environmentVariablesService.RblApiUrl}/api/feeds") ?? new RssVM();
             DataChanged.Invoke();
         }
     }

RBLNews.Web/Program.cs

@@ -10,6 +10,7 @@ builder.Services.AddBlazorBootstrap();
 
 builder.Services.AddSingleton<IFeedDataService, FeedDataService>();
 builder.Services.AddSingleton<AppLifecycleService>();
+builder.Services.AddSingleton<EnvironmentVariablesService>();
 
 var app = builder.Build();
 
@@ -17,10 +18,22 @@ var app = builder.Build();
 if (!app.Environment.IsDevelopment())
 {
 	app.UseExceptionHandler("/Error", createScopeForErrors: true);
+
 	// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
 	app.UseHsts();
 }
 
+using var serviceScope = app.Services.CreateScope();
+IServiceProvider services = serviceScope.ServiceProvider;
+
+EnvironmentVariablesService environmentVariablesService = services.GetRequiredService<EnvironmentVariablesService>();
+string? backendApiUrl = environmentVariablesService.RblApiUrl;
+
+if (string.IsNullOrEmpty(backendApiUrl))
+{
+	throw new Exception($"can't instantiate services, due to paramters are null. backendApiUrl: '{backendApiUrl}'");
+}
+
 app.UseHttpsRedirection();
 
 app.UseStaticFiles();
@@ -28,6 +41,6 @@ app.UseAntiforgery();
 
 app.MapRazorComponents<App>()
 	.AddInteractiveServerRenderMode()
-    .AddAdditionalAssemblies(typeof(RBLNews.Shared._Imports).Assembly);
+	.AddAdditionalAssemblies(typeof( RBLNews.Shared._Imports ).Assembly);
 
 app.Run();