[rewrite] Added a security module from a fastapi example

backend/app/core/config.py

@@ -155,22 +155,27 @@ class EnvConfigField():
                           value=value)
 
 
-class EnvConfig:
-    """Singleton configuration loader for environment variables."""
+class EnvConfig():
 
     _instance = None
+    _initialized = False
 
     def __new__(cls):
-        """Ensures only one instance of EnvConfig is created."""
+        print("Called __new__")
         if cls._instance is None:
             cls._instance = super().__new__(cls)
         return cls._instance
 
     def __init__(self):
+        if EnvConfig._initialized:
+            return
+
         self.logger = logging.getLogger(__name__)
 
         self.fields = {}
 
+        EnvConfig._initialized = True
+
     def add_field(self, name: str, field: EnvConfigField):
         if name in self.fields:
             return

backend/app/core/security.py

@@ -0,0 +1,30 @@
+from datetime import datetime, timedelta, timezone
+from typing import Any
+
+import jwt
+
+from passlib.context import CryptContext
+
+from app.core.config import EnvConfig
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+
+ALGORITHM = "HS256"
+
+
+def create_access_token(subject: str | Any, expires_delta: timedelta) -> str:
+    config = EnvConfig()
+
+    expire = datetime.now(timezone.utc) + expires_delta
+    to_encode = {"exp": expire, "sub": str(subject)}
+    encoded_jwt = jwt.encode(to_encode, config["secret_key"], algorithm=ALGORITHM)
+    return encoded_jwt
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    return pwd_context.hash(password)

backend/app/main.py

@@ -19,6 +19,9 @@ config.add_field("mysql_password", EnvConfigField("MYSQL_PASSWORD", required=Tru
 config.load_config()
 
 
+config2 = EnvConfig()
+
+
 DatabaseManager(
     mysql_user=config["mysql_user"],
     mysql_password=config["mysql_password"],

backend/app/services/auth_service.py

@@ -1,73 +0,0 @@
-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

@@ -3,11 +3,11 @@ from app.models.user_model import User
 
 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")
+    return
     with DatabaseManager.get_session() as session:
         user = User(
             username=user_data.username,