[rewrite] Work on user registration, slightly polished schemas structure

backend/app/services/auth_service.py

@@ -0,0 +1,73 @@
+from datetime import datetime, timedelta, timezone
+import jwt
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jwt.exceptions import JWTException
+from passlib.context import CryptContext
+
+from app.models.user_model import User
+from app.database.manager import DatabaseManager
+
+# Security settings
+SECRET_KEY = "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7"
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 30
+
+# Password hashing setup
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+# OAuth2 for token-based authentication
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
+
+
+def get_password_hash(password: str) -> str:
+    """Hashes a password using bcrypt."""
+    return pwd_context.hash(password)
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """Verifies that a given password matches the stored hashed password."""
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def create_access_token(data: dict, expires_delta: timedelta | None = None) -> str:
+    """Generates a JWT token."""
+    to_encode = data.copy()
+    expire = datetime.now(timezone.utc) + (expires_delta or timedelta(minutes=15))
+    to_encode.update({"exp": expire})
+    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+
+
+def get_user_by_username(username: str) -> User | None:
+    """Retrieves a user from the database by username."""
+    with DatabaseManager.get_session() as session:
+        return session.query(User).filter(User.username == username).first()
+
+
+def authenticate_user(username: str, password: str) -> User | bool:
+    """Authenticates a user by verifying their credentials."""
+    user = get_user_by_username(username)
+    if not user or not verify_password(password, user.password):
+        return False
+    return user
+
+
+async def get_current_user(token: str = Depends(oauth2_scheme)) -> User:
+    """Retrieves the current authenticated user based on the token."""
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        username: str = payload.get("sub")
+        if username is None:
+            raise credentials_exception
+    except JWTException:
+        raise credentials_exception
+
+    user = get_user_by_username(username)
+    if user is None:
+        raise credentials_exception
+    return user

backend/app/services/user_service.py

@@ -1,15 +1,17 @@
 from app.database.manager import DatabaseManager
 from app.models.user_model import User
 
-from app.schemas.user_register_schema import UserRegisterSchema
+from app.schemas.user_schemas import UserRegisterSchema
+
+from app.services.auth_service import get_password_hash
 
 
 def create_user(user_data: UserRegisterSchema):
-
+    print("Creating user")
     with DatabaseManager.get_session() as session:
         user = User(
             username=user_data.username,
-            password=user_data.password,
+            password=get_password_hash(user_data.password),
             email=user_data.email,
             phone_number=user_data.phone_number,
             shop_id=user_data.shop_id