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from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from jose import JWTError, jwt
from passlib.context import CryptContext
from datetime import datetime, timedelta
import os
# Load secrets from environment variables
SECRET_KEY = os.getenv("SECRET_KEY")
ALGORITHM = "HS512"
ACCESS_TOKEN_EXPIRE_MINUTES = 30
# Password hashing
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
# OAuth2 scheme
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
# Mock user database (replace with a real database in production)
fake_users_db = {
"admin": {
"username": "admin",
"hashed_password": pwd_context.hash(os.getenv("ADMIN_PASSWORD")),
}
}
def verify_password(plain_password, hashed_password):
return pwd_context.verify(plain_password, hashed_password)
def authenticate_user(username: str, password: str):
user = fake_users_db.get(username)
if not user or not verify_password(password, user["hashed_password"]):
return False
return user
def create_access_token(data: dict, expires_delta: timedelta = None):
to_encode = data.copy()
if expires_delta:
expire = datetime.utcnow() + expires_delta
else:
expire = datetime.utcnow() + timedelta(minutes=15)
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
except JWTError:
raise credentials_exception
user = fake_users_db.get(username)
if user is None:
raise credentials_exception
return user |