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import os
import bcrypt
from datetime import datetime, timedelta
from typing import Optional
from jose import JWTError, jwt
from pydantic import BaseModel, EmailStr
# Configuration - use environment variables in production
SECRET_KEY = os.getenv("JWT_SECRET_KEY", "contextflow-secret-key-change-in-production-2024")
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = int(os.getenv("JWT_EXPIRE_MINUTES", "1440")) # 24 hours default
# Pydantic models for request/response
class Token(BaseModel):
access_token: str
token_type: str
username: str
class TokenData(BaseModel):
username: Optional[str] = None
class UserCreate(BaseModel):
username: str
email: EmailStr
password: str
class UserLogin(BaseModel):
username: str
password: str
class UserResponse(BaseModel):
id: int
username: str
email: str
created_at: datetime
is_active: int
class Config:
from_attributes = True
def verify_password(plain_password: str, hashed_password: str) -> bool:
"""Verify a password against its hash"""
return bcrypt.checkpw(plain_password.encode('utf-8'), hashed_password.encode('utf-8'))
def get_password_hash(password: str) -> str:
"""Hash a password"""
return bcrypt.hashpw(password.encode('utf-8'), bcrypt.gensalt()).decode('utf-8')
def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
"""Create a JWT access token (no expiration by default)"""
to_encode = data.copy()
# No exp claim → token never expires
return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
def decode_token(token: str) -> Optional[str]:
"""Decode a JWT token and return the username"""
try:
payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM], options={"verify_exp": False})
username: str = payload.get("sub")
return username
except JWTError:
return None
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