Implement Login API

app/build.gradle.kts

@@ -41,9 +41,13 @@ dependencies {
     implementation(libs.navigation.fragment)
     implementation(libs.navigation.ui)
     implementation(libs.room.runtime)
+    implementation(libs.annotation)
     testImplementation(libs.junit)
     androidTestImplementation(libs.ext.junit)
     androidTestImplementation(libs.espresso.core)
     annotationProcessor(libs.room.compiler)
     implementation("com.github.chrisbanes:PhotoView:2.3.0")
+    implementation("com.squareup.retrofit2:retrofit:2.9.0")
+    implementation("com.squareup.retrofit2:converter-gson:2.9.0")
+    implementation("com.squareup.okhttp3:logging-interceptor:4.9.1")
 }

app/src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           xmlns:tools="http://schemas.android.com/tools">
-
+    <uses-permission android:name="android.permission.INTERNET" />
     <application
             android:allowBackup="true"
             android:dataExtractionRules="@xml/data_extraction_rules"

app/src/main/java/com/stormtales/notevault/MainActivity.java

@@ -1,9 +1,8 @@
 package com.stormtales.notevault;
 
 import android.os.Bundle;
-import android.view.View;
+import android.view.MenuItem;
 import android.view.Menu;
-import com.google.android.material.snackbar.Snackbar;
 import com.google.android.material.navigation.NavigationView;
 import androidx.navigation.NavController;
 import androidx.navigation.Navigation;
@@ -12,6 +11,7 @@ import androidx.navigation.ui.NavigationUI;
 import androidx.drawerlayout.widget.DrawerLayout;
 import androidx.appcompat.app.AppCompatActivity;
 import com.stormtales.notevault.databinding.ActivityMainBinding;
+import com.stormtales.notevault.network.auth.AuthService;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -26,14 +26,17 @@ public class MainActivity extends AppCompatActivity {
         setContentView(binding.getRoot());
 
         setSupportActionBar(binding.appBarMain.toolbar);
-        /*binding.appBarMain.fab.setOnClickListener(new View.OnClickListener() {
+        binding.appBarMain.toolbar.setOnMenuItemClickListener(item -> {
-            @Override
+            if (item.getItemId() == R.id.auth_action) {
-            public void onClick(View view) {
+                if (new AuthService(getApplicationContext()).isLoggedIn()) {
-                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
+                    //performLogout(); // Logout-Logik aufrufen
-                        .setAction("Action", null)
+                } else {
-                        .setAnchorView(R.id.fab).show();
+                    showLoginDialog(); // Zeige das Login-Fenster an
                 }
-        });*/
+                return true;
+            }
+            return false;
+        });
         DrawerLayout drawer = binding.drawerLayout;
         NavigationView navigationView = binding.navView;
         // Passing each menu ID as a set of Ids because each
@@ -60,4 +63,20 @@ public class MainActivity extends AppCompatActivity {
         return NavigationUI.navigateUp(navController, mAppBarConfiguration)
                 || super.onSupportNavigateUp();
     }
+
+    @Override
+    public boolean onPrepareOptionsMenu(Menu menu) {
+        MenuItem loginItem = menu.findItem(R.id.auth_action);
+        if (new AuthService(this).isLoggedIn()) {
+            loginItem.setIcon(R.drawable.logout); // Setze das Logout-Symbol
+        } else {
+            loginItem.setIcon(R.drawable.login); // Setze das Login-Symbol
+        }
+        return super.onPrepareOptionsMenu(menu);
+    }
+
+    public void showLoginDialog() {
+        /*LoginFragment loginFragment = new LoginFragment();
+        loginFragment.show(getSupportFragmentManager(), "login");*/
+    }
 }

app/src/main/java/com/stormtales/notevault/data/model/LoggedInUser.java

@@ -0,0 +1,23 @@
+package com.stormtales.notevault.data.model;
+
+/**
+ * Data class that captures user information for logged in users retrieved from LoginRepository
+ */
+public class LoggedInUser {
+
+    private String userId;
+    private String displayName;
+
+    public LoggedInUser(String userId, String displayName) {
+        this.userId = userId;
+        this.displayName = displayName;
+    }
+
+    public String getUserId() {
+        return userId;
+    }
+
+    public String getDisplayName() {
+        return displayName;
+    }
+}

app/src/main/java/com/stormtales/notevault/network/APICallback.java

@@ -0,0 +1,6 @@
+package com.stormtales.notevault.network;
+
+public interface APICallback {
+    void onSuccess();
+    void onError(String error);
+}

app/src/main/java/com/stormtales/notevault/network/NetworkModule.java

@@ -0,0 +1,36 @@
+package com.stormtales.notevault.network;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import com.stormtales.notevault.network.auth.AuthInterceptor;
+import com.stormtales.notevault.network.auth.TokenManager;
+import okhttp3.OkHttpClient;
+import okhttp3.logging.HttpLoggingInterceptor;
+import retrofit2.Retrofit;
+import retrofit2.converter.gson.GsonConverterFactory;
+
+public class NetworkModule {
+    private static final String BASE_URL = "https://192.168.178.30:8000/";
+    private static Retrofit retrofit;
+
+    public static Retrofit getRetrofitInstance(Context context) {
+        if (retrofit == null) {
+            HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
+            loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
+
+            TokenManager tokenManager = new TokenManager(context);
+            OkHttpClient client = new OkHttpClient.Builder()
+                    .addInterceptor(new AuthInterceptor(tokenManager))
+                    .addInterceptor(loggingInterceptor)
+                    .build();
+
+            retrofit = new Retrofit.Builder()
+                    .baseUrl("http://192.168.178.30:8000/")
+                    .client(client)
+                    .addConverterFactory(GsonConverterFactory.create())
+                    .build();
+        }
+        return retrofit;
+    }
+
+}

app/src/main/java/com/stormtales/notevault/network/auth/AuthAPI.java

@@ -0,0 +1,16 @@
+package com.stormtales.notevault.network.auth;
+
+import retrofit2.Call;
+import retrofit2.http.Body;
+import retrofit2.http.Headers;
+import retrofit2.http.POST;
+
+public interface AuthAPI {
+
+    @POST("/login/")
+    Call<LoginResponse> login(@Body LoginRequest loginRequest);
+
+    /*@POST("/register/")
+    @Headers("Content-Type: application/json")
+    Call<StatusResponse> registration(@Body RegisterRequest registerRequest);*/
+}

app/src/main/java/com/stormtales/notevault/network/auth/AuthInterceptor.java

@@ -0,0 +1,29 @@
+package com.stormtales.notevault.network.auth;
+
+import okhttp3.Interceptor;
+import okhttp3.Request;
+import okhttp3.Response;
+
+import java.io.IOException;
+
+public class AuthInterceptor implements Interceptor {
+    private TokenManager tokenManager;
+
+    public AuthInterceptor(TokenManager tokenManager) {
+        this.tokenManager = tokenManager;
+    }
+
+    @Override
+    public Response intercept(Chain chain) throws IOException {
+        Request originalRequest = chain.request();
+
+        String token = tokenManager.getToken();
+        if (token == null) {
+            return chain.proceed(originalRequest);
+        }
+
+        Request authenticatedRequest = originalRequest.newBuilder()
+                .header("Authorization", "Bearer " + token).build();
+        return chain.proceed(authenticatedRequest);
+    }
+}

app/src/main/java/com/stormtales/notevault/network/auth/AuthService.java

@@ -0,0 +1,81 @@
+package com.stormtales.notevault.network.auth;
+
+import android.content.Context;
+import android.text.TextUtils;
+import com.stormtales.notevault.network.APICallback;
+import com.stormtales.notevault.network.NetworkModule;
+import retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Response;
+
+public class AuthService {
+
+    private final AuthAPI authAPI;
+    private final TokenManager tokenManager;
+
+    public AuthService(Context context) {
+        this.authAPI = NetworkModule.getRetrofitInstance(context).create(AuthAPI.class);
+        this.tokenManager = new TokenManager(context);
+    }
+
+    public void performLogin(String email, String password, APICallback callback) {
+        LoginRequest loginRequest = new LoginRequest(email, password);
+
+        authAPI.login(loginRequest).enqueue(new Callback<LoginResponse>() {
+            @Override
+            public void onResponse(Call<LoginResponse> call, Response<LoginResponse> response) {
+                if (response.isSuccessful() && response.body() != null) {
+                    String token = response.body().getToken();
+                    saveToken(token);
+                    // Erfolgsrückmeldung an den Callback senden
+                    callback.onSuccess();
+                } else {
+                    // Fehlermeldung an den Callback senden
+                    callback.onError("Login fehlgeschlagen. Überprüfe Benutzername und Passwort.");
+                }
+            }
+
+            @Override
+            public void onFailure(Call<LoginResponse> call, Throwable t) {
+                // Netzwerkfehler an den Callback senden
+                callback.onError("Netzwerkfehler: " + t.getMessage());
+            }
+        });
+    }
+
+    public void performRegistration(String email, String username, String password, APICallback callback) {
+        /*RegisterRequest registerRequest = new RegisterRequest(username, password, email);
+        authService.registration(registerRequest).enqueue(new Callback<StatusResponse>() {
+
+            @Override
+            public void onResponse(Call<StatusResponse> call, Response<StatusResponse> response) {
+                if(response.isSuccessful() && response.body() != null) {
+                    callback.onSuccess();
+                } else {
+                    callback.onError("Registration fehlgeschlagen. Überprüfe Benutzername und Passwort.");
+                }
+            }
+
+            @Override
+            public void onFailure(Call<StatusResponse> call, Throwable throwable) {
+                callback.onError("Netzwerkfehler: " + throwable.getMessage());
+            }
+        });*/
+    }
+
+    private void saveToken(String token) {
+        tokenManager.saveToken(token);
+    }
+
+    public String getToken() {
+        return tokenManager.getToken();
+    }
+
+    public void logout() {
+        tokenManager.clearToken();
+    }
+
+    public boolean isLoggedIn() {
+        return !TextUtils.isEmpty(tokenManager.getToken());
+    }
+}

app/src/main/java/com/stormtales/notevault/network/auth/LoginRequest.java

@@ -0,0 +1,11 @@
+package com.stormtales.notevault.network.auth;
+
+public class LoginRequest {
+    private String email;
+    private String password;
+
+    public LoginRequest(String email, String password) {
+        this.email = email;
+        this.password = password;
+    }
+}

app/src/main/java/com/stormtales/notevault/network/auth/LoginResponse.java

@@ -0,0 +1,22 @@
+package com.stormtales.notevault.network.auth;
+
+public class LoginResponse {
+    private String token;
+    private String username;
+
+    public String getToken() {
+        return token;
+    }
+
+    public void setToken(String token) {
+        this.token = token;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+}

app/src/main/java/com/stormtales/notevault/network/auth/TokenManager.java

@@ -0,0 +1,31 @@
+package com.stormtales.notevault.network.auth;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+public class TokenManager {
+    private static final String PREF_NAME = "app_preferences";
+    private static final String KEY_TOKEN = "jwt_token";
+
+    private SharedPreferences sharedPreferences;
+
+    public TokenManager(Context context) {
+        sharedPreferences = context.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);
+    }
+
+    public void saveToken(String token) {
+        SharedPreferences.Editor editor = sharedPreferences.edit();
+        editor.putString(KEY_TOKEN, token);
+        editor.apply();
+    }
+
+    public String getToken() {
+        return sharedPreferences.getString(KEY_TOKEN, null);
+    }
+
+    public void clearToken() {
+        SharedPreferences.Editor editor = sharedPreferences.edit();
+        editor.remove(KEY_TOKEN);
+        editor.apply();
+    }
+}

app/src/main/res/drawable/login.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960">
+  <path
+      android:pathData="M480,840v-80h280v-560L480,200v-80h280q33,0 56.5,23.5T840,200v560q0,33 -23.5,56.5T760,840L480,840ZM400,680 L345,622 447,520L120,520v-80h327L345,338l55,-58 200,200 -200,200Z"
+      android:fillColor="#e8eaed"/>
+</vector>

app/src/main/res/drawable/logout.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960">
+  <path
+      android:pathData="M200,840q-33,0 -56.5,-23.5T120,760v-560q0,-33 23.5,-56.5T200,120h280v80L200,200v560h280v80L200,840ZM640,680 L585,622 687,520L360,520v-80h327L585,338l55,-58 200,200 -200,200Z"
+      android:fillColor="#e8eaed"/>
+</vector>

app/src/main/res/layout/fragment_login.xml

@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:id="@+id/container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:paddingBottom="@dimen/fragment_vertical_margin"
+        android:paddingLeft="@dimen/fragment_horizontal_margin"
+        android:paddingRight="@dimen/fragment_horizontal_margin"
+        android:paddingTop="@dimen/fragment_vertical_margin"
+        tools:context=".ui.login.LoginFragment">
+
+    <EditText
+            android:id="@+id/username"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="24dp"
+            android:layout_marginTop="96dp"
+            android:layout_marginEnd="24dp"
+            android:autofillHints="@string/prompt_email"
+            android:hint="@string/prompt_email"
+            android:inputType="textEmailAddress"
+            android:selectAllOnFocus="true"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"/>
+
+    <EditText
+            android:id="@+id/password"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="24dp"
+            android:layout_marginTop="8dp"
+            android:layout_marginEnd="24dp"
+            android:autofillHints="@string/prompt_password"
+            android:hint="@string/prompt_password"
+            android:imeActionLabel="@string/action_sign_in_short"
+            android:imeOptions="actionDone"
+            android:inputType="textPassword"
+            android:selectAllOnFocus="true"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/username"/>
+
+    <Button
+            android:id="@+id/login"
+            android:enabled="false"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="start"
+            android:layout_marginStart="48dp"
+            android:layout_marginTop="16dp"
+            android:layout_marginEnd="48dp"
+            android:layout_marginBottom="64dp"
+            android:text="@string/action_sign_in"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/password"
+            app:layout_constraintVertical_bias="0.2"/>
+
+    <ProgressBar
+            android:id="@+id/loading"
+            android:visibility="gone"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:layout_marginStart="32dp"
+            android:layout_marginTop="64dp"
+            android:layout_marginEnd="32dp"
+            android:layout_marginBottom="64dp"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="@+id/password"
+            app:layout_constraintStart_toStartOf="@+id/password"
+            app:layout_constraintTop_toTopOf="parent"
+            app:layout_constraintVertical_bias="0.3"/>
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/menu/main.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:app="http://schemas.android.com/apk/res-auto">
-    <item android:id="@+id/action_settings"
+    <item android:id="@+id/auth_action"
-          android:title="@string/action_settings"
+          android:title="@string/login"
-          android:orderInCategory="100"
+          android:icon="@drawable/login"
-          app:showAsAction="never"/>
+          app:showAsAction="always"/>
 </menu>

app/src/main/res/values/dimens.xml

@@ -5,4 +5,7 @@
     <dimen name="nav_header_vertical_spacing">8dp</dimen>
     <dimen name="nav_header_height">176dp</dimen>
     <dimen name="fab_margin">16dp</dimen>
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="fragment_horizontal_margin">16dp</dimen>
+    <dimen name="fragment_vertical_margin">16dp</dimen>
 </resources>

app/src/main/res/values/strings.xml

@@ -12,4 +12,14 @@
     <string name="menu_slideshow">Slideshow</string>
     <!-- TODO: Remove or change this placeholder text -->
     <string name="hello_blank_fragment">Hello blank fragment</string>
+    <string name="login">Login</string>
+    <!-- Strings related to login -->
+    <string name="prompt_email">Email</string>
+    <string name="prompt_password">Password</string>
+    <string name="action_sign_in">Sign in or register</string>
+    <string name="action_sign_in_short">Sign in</string>
+    <string name="welcome">"Welcome!"</string>
+    <string name="invalid_username">Not a valid username</string>
+    <string name="invalid_password">Password must be >5 characters</string>
+    <string name="login_failed">"Login failed"</string>
 </resources>

gradle/libs.versions.toml

@@ -12,6 +12,7 @@ navigationFragment = "2.8.5"
 navigationUi = "2.8.5"
 roomRuntime = "2.6.1"
 roomCompiler = "2.6.1"
+annotation = "1.9.1"
 
 [libraries]
 junit = { group = "junit", name = "junit", version.ref = "junit" }
@@ -26,6 +27,7 @@ navigation-fragment = { group = "androidx.navigation", name = "navigation-fragme
 navigation-ui = { group = "androidx.navigation", name = "navigation-ui", version.ref = "navigationUi" }
 room-runtime = { group = "androidx.room", name = "room-runtime", version.ref = "roomRuntime" }
 room-compiler = { group = "androidx.room", name = "room-compiler", version.ref = "roomCompiler" }
+annotation = { group = "androidx.annotation", name = "annotation", version.ref = "annotation" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }