security.py

# security.py

from datetime import datetime, timedelta
from jose import JWTError, jwt
from passlib.context import CryptContext
import os
from dotenv import load_dotenv
from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
import models # Add this import
import database # Add this import

load_dotenv()

SECRET_KEY = os.getenv("SECRET_KEY")
ALGORITHM = os.getenv("ALGORITHM")
ACCESS_TOKEN_EXPIRE_MINUTES = int(os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES"))

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/users/token")

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

def verify_password(plain_password, hashed_password):
    return pwd_context.verify(plain_password, hashed_password)

def get_password_hash(password):
    return pwd_context.hash(password)

def create_access_token(data: dict):
    to_encode = data.copy()
    expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
    return encoded_jwt

async def get_current_user(token: str = Depends(oauth2_scheme)):
    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
        token_data = models.TokenData(username=username)
    except JWTError:
        raise credentials_exception
    
    user = database.users_collection.find_one({"username": token_data.username})
    
    if user is None:
        raise credentials_exception
    
    return user

async def get_current_admin_user(current_user: models.User = Depends(get_current_user)):
    """
    Dependency to get the current user and check if they are an admin.
    Raises a 403 Forbidden error if the user is not an admin.
    """
    if not current_user.get("is_admin"):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="The user does not have administrative privileges",
        )
    return current_user