Andrew K. Choi
31c1644ec2
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85 lines
2.7 KiB
Python
85 lines
2.7 KiB
Python
"""
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Authentication utilities for all services.
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This module provides common authentication functionality to avoid circular imports.
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"""
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from datetime import datetime, timedelta
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from typing import Optional
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import jwt
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from fastapi import Depends, HTTPException, status
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from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
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from jwt.exceptions import InvalidTokenError
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from passlib.context import CryptContext
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from shared.config import settings
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# Password hashing
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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# Bearer token scheme
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security = HTTPBearer()
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def verify_password(plain_password: str, hashed_password: str) -> bool:
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"""Verify password against hash. Apply same truncation as used during hashing."""
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# Apply same truncation logic as during hashing
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password_bytes = plain_password.encode('utf-8')
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if len(password_bytes) > 72:
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plain_password = password_bytes[:72].decode('utf-8', errors='ignore')
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return pwd_context.verify(plain_password, hashed_password)
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def get_password_hash(password: str) -> str:
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"""Get password hash. Truncate password to 72 bytes if necessary for bcrypt compatibility."""
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# bcrypt has a 72-byte limit, so truncate if necessary
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password_bytes = password.encode('utf-8')
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if len(password_bytes) > 72:
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password = password_bytes[:72].decode('utf-8', errors='ignore')
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return pwd_context.hash(password)
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def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
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"""Create access token."""
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to_encode = data.copy()
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if expires_delta:
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expire = datetime.utcnow() + expires_delta
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else:
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expire = datetime.utcnow() + timedelta(minutes=15)
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to_encode.update({"exp": expire})
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encoded_jwt = jwt.encode(
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to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM
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)
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return encoded_jwt
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def verify_token(token: str) -> Optional[dict]:
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"""Verify and decode JWT token."""
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try:
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payload = jwt.decode(
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token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM]
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)
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user_id: str = payload.get("sub")
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if user_id is None:
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return None
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return {"user_id": int(user_id), "email": payload.get("email")}
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except InvalidTokenError:
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return None
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async def get_current_user_from_token(
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credentials: HTTPAuthorizationCredentials = Depends(security),
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) -> dict:
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"""Get current user from JWT token."""
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token = credentials.credentials
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user_data = verify_token(token)
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if user_data is None:
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raise 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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return user_data
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