# Copyright 2018 TrilioData Inc.
# All Rights Reserved.

from keystoneauth1 import exceptions as kse
from oslo_log import log as logging
import webob

from dmapi.i18n import _
from dmapi import utils


LOG = logging.getLogger(__name__)


def verify_project_id(context, project_id):
    """verify that a project_id exists.

    This attempts to verify that a project id exists. If it does not,
    an HTTPBadRequest is emitted.

    """
    adap = utils.get_ksa_adapter(
        'identity', ksa_auth=context.get_auth_plugin(),
        min_version=(3, 0), max_version=(3, 'latest'))

    failure = webob.exc.HTTPBadRequest(
            explanation=_("Project ID %s is not a valid project.") %
            project_id)
    try:
        resp = adap.get('/projects/%s' % project_id, raise_exc=False)
    except kse.EndpointNotFound:
        LOG.error(
            "Keystone identity service version 3.0 was not found. This might "
            "be because your endpoint points to the v2.0 versioned endpoint "
            "which is not supported. Please fix this.")
        raise failure
    except kse.ClientException:
        # something is wrong, like there isn't a keystone v3 endpoint,
        # or dmapi isn't configured for the interface to talk to it;
        # we'll take the pass and default to everything being ok.
        LOG.info("Unable to contact keystone to verify project_id")
        return True

    if resp:
        # All is good with this 20x status
        return True
    elif resp.status_code == 404:
        # we got access, and we know this project is not there
        raise failure
    elif resp.status_code == 403:
        # we don't have enough permission to verify this, so default
        # to "it's ok".
        LOG.info(
            "Insufficient permissions for user %(user)s to verify "
            "existence of project_id %(pid)s",
            {"user": context.user_id, "pid": project_id})
        return True
    else:
        LOG.warning(
            "Unexpected response from keystone trying to "
            "verify project_id %(pid)s - resp: %(code)s %(content)s",
            {"pid": project_id,
             "code": resp.status_code,
             "content": resp.content})
        # realize we did something wrong, but move on with a warning
        return True