fix&update[UserService]: change login to return a User, easier connec…

…tion to frontend

src/main/java/edu/group5/app/model/user/UserService.java

@@ -65,15 +65,18 @@ public boolean registerUser(String role, String firstName, String lastName,
    * Authenticates a user based on the provided email and password.
    * @param email the email address of the user attempting to log in; must not be null or empty
    * @param password the plaintext password of the user attempting to log in; must not be null or empty
-   * @return true if the login is successful 
-   * (i.e., the user exists and the password is correct), false otherwise
+   * @return the authenticated User object if the login is successful 
+   * (i.e., the user exists and the password is correct), null otherwise
    * @throws IllegalArgumentException if email is null or empty, or if password is null or empty
    */
-  public boolean login(String email, char[] password) {
+  public User login(String email, char[] password) {
     if (email == null || email.trim().isEmpty() || password == null || password.length == 0) {
-        return false;
+        return null;
     }
     User user = this.userRepository.findUserByEmail(email);
-    return user != null && user.verifyPassword(password);
+    if (user != null && user.verifyPassword(password)) {
+      return user;
+    }
+    return null;
   }
 }

src/test/java/edu/group5/app/model/user/UserServiceTest.java

@@ -4,6 +4,8 @@
 import org.junit.jupiter.api.Test;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
 
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
 
@@ -95,8 +97,10 @@ void loginValidPassword() {
     User testUser = new Customer(10, "Test", "User", "test@example.com", hashedPassword);
     repo.addContent(testUser);
 
-    boolean result = service.login("test@example.com", plainPassword.toCharArray());
-    assertTrue(result);
+    User result = service.login("test@example.com", plainPassword.toCharArray());
+    assertNotNull(result);
+    assertEquals("test@example.com", result.getEmail());
+    assertTrue(result.verifyPassword(plainPassword.toCharArray()));
   }
 
   @Test
@@ -107,23 +111,23 @@ void loginInvalidPassword() {
     User testUser = new Customer(10, "Test", "User", "test@example.com", hashedPassword);
     repo.addContent(testUser);
 
-    boolean result = service.login("test@example.com", "wrongpass".toCharArray());
-    boolean result2 = service.login("test@example.com", null);
-    boolean result3 = service.login("test@example.com", " ".toCharArray());
-    boolean result4 = service.login("test@example.com", new char[0]);
-    assertFalse(result);
-    assertFalse(result2);
-    assertFalse(result3);
-    assertFalse(result4);
+    User result = service.login("test@example.com", "wrongpass".toCharArray());
+    User result2 = service.login("test@example.com", null);
+    User result3 = service.login("test@example.com", " ".toCharArray());
+    User result4 = service.login("test@example.com", new char[0]);
+    assertNull(result);
+    assertNull(result2);
+    assertNull(result3);
+    assertNull(result4);
   }
 
   @Test
   void loginInvalidEmail() {
-    boolean result = service.login("nonexist@example.com", "password".toCharArray());
-    boolean result2 = service.login(null, "password".toCharArray());
-    boolean result3 = service.login("   ", "password".toCharArray());
-    assertFalse(result);
-    assertFalse(result2);
-    assertFalse(result3);
+    User result = service.login("nonexist@example.com", "password".toCharArray());
+    User result2 = service.login(null, "password".toCharArray());
+    User result3 = service.login("   ", "password".toCharArray());
+    assertNull(result);
+    assertNull(result2);
+    assertNull(result3);
   }
 }