Feature request: Custom Exception when OAuth2 scopes requirements are not met

[LTsCreed]

Implement a custom exception for cases where OAuth2 scope requirements are not satisfied. This feature enables the display of distinct error messages for authenticated users, enhancing the overall understanding of the issue.

[kigawas]

Can you provide a more specific example?

[LTsCreed]

When the token does not contain all required scopes, the self.not_authenticated_exception is raised. I wish to have the ability to raise a different exception, so the user would know that they don't have the necessary permissions.

  ` token = await self._get_token(request)

    if token is None:
        # No token is present in the request and no Exception has been raised (auto_error=False)
        raise self.not_authenticated_exception

    # when the manager was invoked using fastapi.Security(manager, scopes=[...])
    # we have to check if all required scopes are contained in the token
    if security_scopes is not None and security_scopes.scopes:
        if not self.has_scopes(token, security_scopes):
            raise self.not_authenticated_exception

    return await self.get_current_user(token)`

[kigawas]

So you'd like to have something like not_have_scopes_exception?

[LTsCreed]

Yes, something like that

[kigawas]

Almost done. I'll release it in several days