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Authentication and authorization
JWT-based authentication with role-based access control
"""
from datetime import datetime, timedelta, timezone
from typing import Optional
import bcrypt
from jose import JWTError, jwt
from fastapi import Depends, HTTPException, status, Request
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel
from ..config import settings
# Security
security = HTTPBearer()
class Token(BaseModel):
access_token: str
token_type: str
class TokenData(BaseModel):
username: Optional[str] = None
scopes: list = []
class User(BaseModel):
username: str
email: Optional[str] = None
full_name: Optional[str] = None
disabled: bool = False
scopes: list = []
tenant_id: Optional[str] = None
def verify_password(plain_password: str, hashed_password: str) -> bool:
"""Verify password hash"""
try:
# bcrypt requires bytes, truncate to 72 bytes as per bcrypt spec
password_bytes = plain_password.encode('utf-8')[:72]
return bcrypt.checkpw(password_bytes, hashed_password.encode('utf-8'))
except ValueError:
return False
def get_password_hash(password: str) -> str:
"""Hash password"""
password_bytes = password.encode('utf-8')[:72]
return bcrypt.hashpw(password_bytes, bcrypt.gensalt()).decode('utf-8')
def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
"""
Create JWT access token
Args:
data: Token payload data
expires_delta: Optional expiration time
Returns:
JWT token string
"""
to_encode = data.copy()
if expires_delta:
expire = datetime.now(timezone.utc).replace(tzinfo=None) + expires_delta
else:
expire = datetime.now(timezone.utc).replace(tzinfo=None) + timedelta(minutes=settings.access_token_expire_minutes)
to_encode.update({"exp": expire})
encoded_jwt = jwt.encode(
to_encode,
settings.secret_key,
algorithm=settings.algorithm
)
return encoded_jwt
def decode_token(token: str) -> TokenData:
"""
Decode and validate JWT token
Args:
token: JWT token string
Returns:
TokenData with username and scopes
Raises:
HTTPException if token is invalid
"""
credentials_exception = HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Could not validate credentials",
headers={"WWW-Authenticate": "Bearer"},
)
try:
payload = jwt.decode(
token,
settings.secret_key,
algorithms=[settings.algorithm]
)
username: str = payload.get("sub")
if username is None:
raise credentials_exception
token_data = TokenData(
username=username,
scopes=payload.get("scopes", [])
)
return token_data
except JWTError:
raise credentials_exception
async def get_current_user(
request: Request,
credentials: HTTPAuthorizationCredentials = Depends(security)
) -> User:
"""
Get current user from JWT token
Args:
request: FastAPI Request to access app state
credentials: Authorization credentials from header
Returns:
Current user
Raises:
HTTPException if authentication fails
"""
token = credentials.credentials
token_data = decode_token(token)
store = getattr(request.app.state, "graph_store", None)
if not store:
raise HTTPException(status_code=503, detail="Graph store unavailable")
user_data = await store.get_user(token_data.username)
if not user_data:
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="User not found",
headers={"WWW-Authenticate": "Bearer"},
)
user = User(
username=user_data["username"],
email=user_data.get("email"),
full_name=user_data.get("full_name"),
scopes=user_data.get("scopes", []),
disabled=user_data.get("disabled", False),
tenant_id=user_data.get("tenant_id", settings.default_tenant_id)
)
if user.disabled:
raise HTTPException(
status_code=status.HTTP_400_BAD_REQUEST,
detail="Inactive user"
)
return user
def check_scope(required_scope: str):
"""
Dependency to check if user has required scope
Args:
required_scope: Required scope/permission
Returns:
Dependency function
"""
async def scope_checker(current_user: User = Depends(get_current_user)):
if required_scope not in current_user.scopes and "admin" not in current_user.scopes:
raise HTTPException(
status_code=status.HTTP_403_FORBIDDEN,
detail="Not enough permissions"
)
return current_user
return scope_checker
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