Implemented the first attempt at authentication in the LoginView view.

Modules/Sources/Login/UI/Views/LoginView.swift

@@ -6,6 +6,11 @@
 //  Copyright © 2022 Röck+Cöde. All rights reserved.
 //
 
+import APIService
+import DataModels
+import DependencyInjection
+import Dependencies
+import KeychainStorage
 import SwiftUI
 
 public struct LoginView: View {
@@ -43,6 +48,14 @@ public struct LoginView: View {
 fileprivate extension LoginView {
     struct LoginContainer: View {
         
+        // MARK: Dependencies
+        
+        @Dependency(\.apiService) private var apiService
+        
+        // MARK: Storages
+        
+        @KeychainStorage(key: .KeychainStorage.account) private var account: Account?
+        
         // MARK: States
         
         @State private var isAuthenticating: Bool = false
@@ -68,11 +81,11 @@ fileprivate extension LoginView {
                     password: $password,
                     errorMessage: $errorMessage
                 ) {
-                    // TODO: login with the username and password.
+                    isAuthenticating = true
                 }
 
                 Button {
-                    // TODO: login with the username and password.
+                    isAuthenticating = true
                 } label: {
                     Label {
                         Text(
@@ -95,6 +108,9 @@ fileprivate extension LoginView {
                 .buttonBorderShape(.roundedRectangle(radius: 8))
                 .controlSize(.large)
                 .disabled(isLoginDisabled)
+                .task(id: isAuthenticating) {
+                    await authenticate()
+                }
             }
         }
     }
@@ -103,9 +119,37 @@ fileprivate extension LoginView {
 // MARK: - Helpers
 
 private extension LoginView.LoginContainer {
+    
+    // MARK: Computed
+    
     var isLoginDisabled: Bool {
         username.isEmpty || password.isEmpty
     }
+    
+    // MARK: Functions
+    
+    func authenticate() async {
+        guard isAuthenticating else { return }
+        
+        do {
+            _ = try await apiService.getUser(credentials: .init(
+                username: username,
+                password: password
+            ))
+            
+            account = .init(
+                username: username,
+                password: password
+            )
+        } catch APIClientError.authenticationFailed {
+            errorMessage = .init(localized: "login.error.authentication_failed.text")
+            isAuthenticating = false
+        } catch {
+            errorMessage = .init(localized: "login.error.unknown.text")
+            isAuthenticating = false
+        }
+    }
+
 }
 
 // MARK: - Previews