a working product with ugly ui

app/services/auth_service.py

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+from sqlalchemy.orm import Session
+from fastapi import HTTPException, status
+from app.models.user import User
+from app.schemas.user import UserCreate
+from app.schemas.auth import TokenResponse
+from app.utils.password import hash_password, verify_password
+from app.utils.security import create_access_token, create_refresh_token
+from app.config import settings
+
+
+def authenticate_user(db: Session, username: str, password: str) -> User:
+    """
+    Authenticate a user by username and password.
+
+    Args:
+        db: Database session
+        username: Username
+        password: Plain text password
+
+    Returns:
+        User object if authentication successful
+
+    Raises:
+        HTTPException: If authentication fails
+    """
+    user = db.query(User).filter(User.username == username).first()
+
+    if not user or not verify_password(password, user.password_hash):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+    return user
+
+
+def create_user(db: Session, user_data: UserCreate) -> User:
+    """
+    Create a new user.
+
+    Args:
+        db: Database session
+        user_data: User creation data
+
+    Returns:
+        Created user object
+
+    Raises:
+        HTTPException: If username or email already exists
+    """
+    # Check if registration is allowed
+    if not settings.ALLOW_REGISTRATION:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="User registration is currently disabled"
+        )
+
+    # Check if username already exists
+    if db.query(User).filter(User.username == user_data.username).first():
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Username already registered"
+        )
+
+    # Check if email already exists
+    if db.query(User).filter(User.email == user_data.email).first():
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Email already registered"
+        )
+
+    # Create new user
+    hashed_password = hash_password(user_data.password)
+    db_user = User(
+        username=user_data.username,
+        email=user_data.email,
+        password_hash=hashed_password,
+        is_admin=False
+    )
+
+    db.add(db_user)
+    db.commit()
+    db.refresh(db_user)
+
+    return db_user
+
+
+def create_tokens_for_user(user: User) -> TokenResponse:
+    """
+    Create access and refresh tokens for a user.
+
+    Args:
+        user: User object
+
+    Returns:
+        TokenResponse with access and refresh tokens
+    """
+    access_token = create_access_token(str(user.id))
+    refresh_token = create_refresh_token(str(user.id))
+
+    return TokenResponse(
+        access_token=access_token,
+        refresh_token=refresh_token,
+        token_type="bearer"
+    )