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Security utilities for ClipboardHealthAI application.
This module provides authentication and authorization functionality, including:
- Password verification
- JWT token creation and validation
- Permission-based endpoint protection using FastAPI dependencies
"""
from datetime import datetime, timedelta
import anyio
from fastapi import Depends, HTTPException
from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
from jose import JWTError, jwt
from passlib.context import CryptContext
from cbh.api.account.dto import AccountType
from cbh.api.account.models import AccountModel
from cbh.core.config import settings
def verify_password(plain_password, hashed_password) -> bool:
"""
Verify a password against its hashed version.
Args:
plain_password: The plain text password to verify
hashed_password: The hashed password to check against
Returns:
bool: True if the password matches, False otherwise
"""
result = CryptContext(schemes=["bcrypt"], deprecated="auto").verify(
plain_password, hashed_password
)
return result
def create_access_token(email: str, account_id: str, account_type: AccountType):
"""
Create a JWT access token for a user.
Args:
email: User's email address
account_id: User's account ID
account_type: User's account type
Returns:
str: Encoded JWT token
"""
payload = {
"http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name": email,
"http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier": account_id,
"accountId": account_id,
"accountType": account_type.value,
"iss": settings.Issuer,
"aud": settings.Audience,
"exp": datetime.utcnow() + timedelta(days=30),
}
encoded_jwt = jwt.encode(payload, settings.SECRET_KEY, algorithm="HS256")
return encoded_jwt
class PermissionDependency:
"""
FastAPI dependency for protecting endpoints with authentication.
This class implements the callable interface required for FastAPI dependencies
and validates JWT tokens for protected endpoints.
"""
def __init__(
self, account_type: list[AccountType] | None = None, required: bool = True
):
self.account_types = account_type
self.required = required
def __call__(
self,
credentials: HTTPAuthorizationCredentials | None = Depends(
HTTPBearer(auto_error=False)
),
) -> AccountModel | None:
"""
Validate authorization credentials and return account details.
This method is called by FastAPI when the dependency is used.
Args:
credentials: The HTTP authorization credentials from the request
Returns:
AccountModel: The account details if authentication is successful
Raises:
HTTPException: If authentication fails
"""
try:
if not credentials and self.required:
raise HTTPException(status_code=401, detail="Unauthorized")
elif not credentials and not self.required:
return None
account_id = self.authenticate_jwt_token(credentials.credentials)
account_data = anyio.from_thread.run(self.get_account_by_id, account_id)
self.check_account_health(account_data)
return AccountModel.from_mongo(account_data)
except JWTError as e:
raise HTTPException( # pylint: disable=W0707
status_code=403, detail="Permission denied"
)
except Exception as e:
if isinstance(e, HTTPException) and e.status_code == 401:
raise e
raise HTTPException( # pylint: disable=W0707
status_code=403, detail="Permission denied"
)
@staticmethod
async def get_account_by_id(account_id: str) -> dict:
"""
Retrieve account data from the database by ID.
Args:
account_id: The account ID to look up
Returns:
dict: Account data from the database
"""
account = await settings.DB_CLIENT.accounts.find_one({"id": account_id})
if not account:
raise HTTPException(status_code=403, detail="Permission denied")
return account
def check_account_health(self, account: dict):
"""
Verify account data is valid and active.
Args:
account: Account data dictionary
Raises:
HTTPException: If the account is not valid
"""
if not account:
raise HTTPException(status_code=403, detail="Permission denied")
if (
self.account_types
and AccountType(account["accountType"]) not in self.account_types
):
raise HTTPException(status_code=403, detail="Permission denied")
@staticmethod
def authenticate_jwt_token(token: str) -> str:
"""
Validate a JWT token and extract the account ID.
Args:
token: JWT token string
Returns:
str: Account ID from the token
Raises:
HTTPException: If token validation fails
"""
payload = jwt.decode(
token, settings.SECRET_KEY, algorithms="HS256", audience=settings.Audience
)
email: str | None = payload.get(
"http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name"
)
account_id: str | None = payload.get("accountId")
if email is None or account_id is None:
raise HTTPException(status_code=403, detail="Permission denied")
return account_id
def check_account_token(token: str) -> dict | None:
try:
payload = jwt.decode(
token, settings.SECRET_KEY, algorithms="HS256", audience=settings.Audience
)
email: str | None = payload.get(
"http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name"
)
account_id: str | None = payload.get("accountId")
if email is None or account_id is None:
return None
return {
"email": email,
"account_id": account_id,
"account_type": payload.get("accountType"),
}
except Exception as _:
return None
|