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# fastapi_crud/app/auth.py
from fastapi import Depends, HTTPException, status
from jose import JWTError, jwt
from sqlalchemy.orm import Session
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from passlib.context import CryptContext
from datetime import timedelta, datetime
from . import crud, models, schemas, database
# Generate your secret key using the script above and replace it here
SECRET_KEY = "a12f6578e42b1e1e4f48d4d4c8482e92f00a1de8eb5290a4f7a6b42a51220b29"
ALGORITHM = "HS256"
# Set a very long expiration time, e.g., 365 days
ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24 * 365
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
def authenticate_user(db: Session, username: str, password: str):
user = crud.get_user_by_username(db, username)
if not user:
return False
if not pwd_context.verify(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:
to_encode.update({"exp": datetime.utcnow() + expires_delta})
else:
to_encode.update({"exp": datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)})
encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
return encoded_jwt
async def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(database.get_db)):
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 = crud.get_user_by_username(db, username=username)
if user is None:
raise credentials_exception
return user
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