maybe good

app/auth/security.py

@@ -0,0 +1,107 @@
+"""
+Authentication and security utilities
+"""
+from datetime import datetime, timedelta
+from typing import Optional, Union
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from sqlalchemy.orm import Session
+from fastapi import HTTPException, status, Depends
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+
+from app.config import settings
+from app.database.base import get_db
+from app.models.user import User
+
+# Password hashing
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+# JWT Security
+security = HTTPBearer()
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """Verify a plain password against its hash"""
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    """Generate password hash"""
+    return pwd_context.hash(password)
+
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
+    """Create JWT access token"""
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=settings.access_token_expire_minutes)
+    
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, settings.secret_key, algorithm=settings.algorithm)
+    return encoded_jwt
+
+
+def verify_token(token: str) -> Optional[str]:
+    """Verify JWT token and return username"""
+    try:
+        payload = jwt.decode(token, settings.secret_key, algorithms=[settings.algorithm])
+        username: str = payload.get("sub")
+        if username is None:
+            return None
+        return username
+    except JWTError:
+        return None
+
+
+def authenticate_user(db: Session, username: str, password: str) -> Optional[User]:
+    """Authenticate user credentials"""
+    user = db.query(User).filter(User.username == username).first()
+    if not user:
+        return None
+    if not verify_password(password, user.hashed_password):
+        return None
+    return user
+
+
+def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+    db: Session = Depends(get_db)
+) -> User:
+    """Get current authenticated user"""
+    token = credentials.credentials
+    username = verify_token(token)
+    
+    if username is None:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Could not validate credentials",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    
+    user = db.query(User).filter(User.username == username).first()
+    if user is None:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="User not found",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    
+    if not user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Inactive user"
+        )
+    
+    return user
+
+
+def get_admin_user(current_user: User = Depends(get_current_user)) -> User:
+    """Require admin privileges"""
+    if not current_user.is_admin:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions"
+        )
+    return current_user