74 lines
2.5 KiB
Python
74 lines
2.5 KiB
Python
from datetime import datetime, timedelta, timezone
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import jwt
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from fastapi import Depends, HTTPException, status
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from fastapi.security import OAuth2PasswordBearer
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from jwt.exceptions import JWTException
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from passlib.context import CryptContext
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from app.models.user_model import User
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from app.database.manager import DatabaseManager
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# Security settings
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SECRET_KEY = "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7"
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 30
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# Password hashing setup
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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# OAuth2 for token-based authentication
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
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def get_password_hash(password: str) -> str:
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"""Hashes a password using bcrypt."""
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return pwd_context.hash(password)
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def verify_password(plain_password: str, hashed_password: str) -> bool:
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"""Verifies that a given password matches the stored hashed password."""
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return pwd_context.verify(plain_password, hashed_password)
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def create_access_token(data: dict, expires_delta: timedelta | None = None) -> str:
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"""Generates a JWT token."""
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to_encode = data.copy()
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expire = datetime.now(timezone.utc) + (expires_delta or timedelta(minutes=15))
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to_encode.update({"exp": expire})
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return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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def get_user_by_username(username: str) -> User | None:
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"""Retrieves a user from the database by username."""
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with DatabaseManager.get_session() as session:
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return session.query(User).filter(User.username == username).first()
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def authenticate_user(username: str, password: str) -> User | bool:
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"""Authenticates a user by verifying their credentials."""
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user = get_user_by_username(username)
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if not user or not verify_password(password, user.password):
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return False
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return user
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async def get_current_user(token: str = Depends(oauth2_scheme)) -> User:
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"""Retrieves the current authenticated user based on the token."""
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Could not validate credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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try:
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payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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username: str = payload.get("sub")
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if username is None:
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raise credentials_exception
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except JWTException:
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raise credentials_exception
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user = get_user_by_username(username)
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if user is None:
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raise credentials_exception
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return user
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