from dataclasses import dataclass

from sendgrid.helpers.eventwebhook import EventWebhook

from app.exceptions import AuthException
from app.models import Request


@dataclass(kw_only=True)
class Auth:
    sendgrid_validators: dict[str, EventWebhook]

    def validate(self, request: Request) -> None:
        self._validate_signature(request)

    def _validate_signature(self, request: Request) -> None:
        try:
            validator = self.sendgrid_validators[request.path]
            signature_correct = validator.verify_signature(
                payload=request.body,
                signature=request.headers.signature,
                timestamp=request.headers.timestamp,
            )
        except Exception as exc:
            raise AuthException from exc

        if signature_correct is not True:
            raise AuthException