# Copyright 2018 TrilioData Inc.
# All Rights Reserved.


from oslo_policy import policy

from nova.policies import base


RULE_AOO = base.RULE_ADMIN_OR_OWNER
SERVERS = 'os_compute_api:servers:%s'
NETWORK_ATTACH_EXTERNAL = 'network:attach_external_network'
ZERO_DISK_FLAVOR = SERVERS % 'create:zero_disk_flavor'

rules = [
    policy.DocumentedRuleDefault(
        SERVERS % 'index',
        RULE_AOO,
        "List all servers",
        [
            {
                'method': 'GET',
                'path': '/servers'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'detail',
        RULE_AOO,
        "List all servers with detailed information",
        [
            {
                'method': 'GET',
                'path': '/servers/detail'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'index:get_all_tenants',
        base.RULE_ADMIN_API,
        "List all servers for all projects",
        [
            {
                'method': 'GET',
                'path': '/servers'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'detail:get_all_tenants',
        base.RULE_ADMIN_API,
        "List all servers with detailed information for all projects",
        [
            {
                'method': 'GET',
                'path': '/servers/detail'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'show',
        RULE_AOO,
        "Show a server",
        [
            {
                'method': 'GET',
                'path': '/servers/{server_id}'
            }
        ]),
    # the details in host_status are pretty sensitive, only admins
    # should do that by default.
    policy.DocumentedRuleDefault(
        SERVERS % 'show:host_status',
        base.RULE_ADMIN_API,
        "Show a server with additional host status information",
        [
            {
                'method': 'GET',
                'path': '/servers/{server_id}'
            },
            {
                'method': 'GET',
                'path': '/servers/detail'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'create',
        RULE_AOO,
        "Create a server",
        [
            {
                'method': 'POST',
                'path': '/servers'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'create:forced_host',
        base.RULE_ADMIN_API,
        "Create a server on the specified host",
        [
            {
                'method': 'POST',
                'path': '/servers'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'create:attach_volume',
        RULE_AOO,
        "Create a server with the requested volume attached to it",
        [
            {
                'method': 'POST',
                'path': '/servers'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'create:attach_network',
        RULE_AOO,
        "Create a server with the requested network attached to it",
        [
            {
                'method': 'POST',
                'path': '/servers'
            }
        ]),
    policy.DocumentedRuleDefault(
        ZERO_DISK_FLAVOR,
        # TODO(mriedem): Default to RULE_ADMIN_API in Stein.
        RULE_AOO,
        """
This rule controls the compute API validation behavior of creating a server
with a flavor that has 0 disk, indicating the server should be volume-backed.

For a flavor with disk=0, the root disk will be set to exactly the size of the
image used to deploy the instance. However, in this case the filter_scheduler
cannot select the compute host based on the virtual image size. Therefore, 0
should only be used for volume booted instances or for testing purposes.

WARNING: It is a potential security exposure to enable this policy rule
if users can upload their own images since repeated attempts to
create a disk=0 flavor instance with a large image can exhaust
the local disk of the compute (or shared storage cluster). See bug
https://bugs.launchpad.net/nova/+bug/1739646 for details.

This rule defaults to ``rule:admin_or_owner`` for backward compatibility but
will be changed to default to ``rule:admin_api`` in a subsequent release.
""",
        [
            {
                'method': 'POST',
                'path': '/servers'
            }
        ]),
    policy.DocumentedRuleDefault(
        NETWORK_ATTACH_EXTERNAL,
        'is_admin:True',
        "Attach an unshared external network to a server",
        [
            # Create a server with a requested network or port.
            {
                'method': 'POST',
                'path': '/servers'
            },
            # Attach a network or port to an existing server.
            {
                'method': 'POST',
                'path': '/servers/{server_id}/os-interface'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'delete',
        RULE_AOO,
        "Delete a server",
        [
            {
                'method': 'DELETE',
                'path': '/servers/{server_id}'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'update',
        RULE_AOO,
        "Update a server",
        [
            {
                'method': 'PUT',
                'path': '/servers/{server_id}'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'confirm_resize',
        RULE_AOO,
        "Confirm a server resize",
        [
            {
                'method': 'POST',
                'path': '/servers/{server_id}/action (confirmResize)'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'revert_resize',
        RULE_AOO,
        "Revert a server resize",
        [
            {
                'method': 'POST',
                'path': '/servers/{server_id}/action (revertResize)'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'reboot',
        RULE_AOO,
        "Reboot a server",
        [
            {
                'method': 'POST',
                'path': '/servers/{server_id}/action (reboot)'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'resize',
        RULE_AOO,
        "Resize a server",
        [
            {
                'method': 'POST',
                'path': '/servers/{server_id}/action (resize)'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'rebuild',
        RULE_AOO,
        "Rebuild a server",
        [
            {
                'method': 'POST',
                'path': '/servers/{server_id}/action (rebuild)'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'create_image',
        RULE_AOO,
        "Create an image from a server",
        [
            {
                'method': 'POST',
                'path': '/servers/{server_id}/action (createImage)'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'create_image:allow_volume_backed',
        RULE_AOO,
        "Create an image from a volume backed server",
        [
            {
                'method': 'POST',
                'path': '/servers/{server_id}/action (createImage)'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'start',
        RULE_AOO,
        "Start a server",
        [
            {
                'method': 'POST',
                'path': '/servers/{server_id}/action (os-start)'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'stop',
        RULE_AOO,
        "Stop a server",
        [
            {
                'method': 'POST',
                'path': '/servers/{server_id}/action (os-stop)'
            }
        ]),
    policy.DocumentedRuleDefault(
        SERVERS % 'trigger_crash_dump',
        RULE_AOO,
        "Trigger crash dump in a server",
        [
            {
                'method': 'POST',
                'path': '/servers/{server_id}/action (trigger_crash_dump)'
            }
        ]),
]


def list_rules():
    return rules