# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.


# alias because we already had an option named argparse
import argparse as argparse_mod
import collections
import copy
import errno
import json
import os
import re
import sys
import warnings

import appdirs
from keystoneauth1 import adapter
from keystoneauth1 import loading
import yaml

from openstack import _log
from openstack.config import _util
from openstack.config import cloud_region
from openstack.config import defaults
from openstack.config import vendors
from openstack import exceptions

APPDIRS = appdirs.AppDirs('openstack', 'OpenStack', multipath='/etc')
CONFIG_HOME = APPDIRS.user_config_dir
CACHE_PATH = APPDIRS.user_cache_dir

# snaps do set $HOME to something like
# /home/$USER/snap/openstackclients/$SNAP_VERSION
# the real home (usually /home/$USERNAME) is stored in $SNAP_REAL_HOME
# see https://snapcraft.io/docs/environment-variables
SNAP_REAL_HOME = os.getenv('SNAP_REAL_HOME')
if SNAP_REAL_HOME:
    UNIX_CONFIG_HOME = os.path.join(os.path.join(SNAP_REAL_HOME, '.config'),
                                    'openstack')
else:
    UNIX_CONFIG_HOME = os.path.join(
        os.path.expanduser(os.path.join('~', '.config')), 'openstack')
UNIX_SITE_CONFIG_HOME = '/etc/openstack'

SITE_CONFIG_HOME = APPDIRS.site_config_dir

CONFIG_SEARCH_PATH = [
    os.getcwd(),
    CONFIG_HOME, UNIX_CONFIG_HOME,
    SITE_CONFIG_HOME, UNIX_SITE_CONFIG_HOME
]
YAML_SUFFIXES = ('.yaml', '.yml')
JSON_SUFFIXES = ('.json',)
CONFIG_FILES = [
    os.path.join(d, 'clouds' + s)
    for d in CONFIG_SEARCH_PATH
    for s in YAML_SUFFIXES + JSON_SUFFIXES
]
SECURE_FILES = [
    os.path.join(d, 'secure' + s)
    for d in CONFIG_SEARCH_PATH
    for s in YAML_SUFFIXES + JSON_SUFFIXES
]
VENDOR_FILES = [
    os.path.join(d, 'clouds-public' + s)
    for d in CONFIG_SEARCH_PATH
    for s in YAML_SUFFIXES + JSON_SUFFIXES
]

BOOL_KEYS = ('insecure', 'cache')

FORMAT_EXCLUSIONS = frozenset(['password'])


def get_boolean(value):
    if value is None:
        return False
    if type(value) is bool:
        return value
    if value.lower() == 'true':
        return True
    return False


def _auth_update(old_dict, new_dict_source):
    """Like dict.update, except handling the nested dict called auth."""
    new_dict = copy.deepcopy(new_dict_source)
    for (k, v) in new_dict.items():
        if k == 'auth':
            if k in old_dict:
                old_dict[k].update(v)
            else:
                old_dict[k] = v.copy()
        else:
            old_dict[k] = v
    return old_dict


def _fix_argv(argv):
    # Transform any _ characters in arg names to - so that we don't
    # have to throw billions of compat argparse arguments around all
    # over the place.
    processed = collections.defaultdict(set)
    for index in range(0, len(argv)):
        # If the value starts with '--' and has '-' or '_' in it, then
        # it's worth looking at it
        if re.match('^--.*(_|-)+.*', argv[index]):
            split_args = argv[index].split('=')
            orig = split_args[0]
            new = orig.replace('_', '-')
            if orig != new:
                split_args[0] = new
                argv[index] = "=".join(split_args)
            # Save both for later so we can throw an error about dupes
            processed[new].add(orig)
    overlap = []
    for new, old in processed.items():
        if len(old) > 1:
            overlap.extend(old)
    if overlap:
        raise exceptions.ConfigException(
            "The following options were given: '{options}' which contain"
            " duplicates except that one has _ and one has -. There is"
            " no sane way for us to know what you're doing. Remove the"
            " duplicate option and try again".format(
                options=','.join(overlap)))


class OpenStackConfig:

    # These two attribute are to allow os-client-config to plumb in its
    # local versions for backwards compat.
    # They should not be used by anyone else.
    _cloud_region_class = cloud_region.CloudRegion
    _defaults_module = defaults

    def __init__(self, config_files=None, vendor_files=None,
                 override_defaults=None, force_ipv4=None,
                 envvar_prefix=None, secure_files=None,
                 pw_func=None, session_constructor=None,
                 app_name=None, app_version=None,
                 load_yaml_config=True, load_envvars=True,
                 statsd_host=None, statsd_port=None,
                 statsd_prefix=None, influxdb_config=None):
        self.log = _log.setup_logging('openstack.config')
        self._session_constructor = session_constructor
        self._app_name = app_name
        self._app_version = app_version
        self._load_envvars = load_envvars

        if load_yaml_config:
            # "if config_files" is not sufficient to process empty list
            if config_files is not None:
                self._config_files = config_files
            else:
                self._config_files = CONFIG_FILES
            if secure_files is not None:
                self._secure_files = secure_files
            else:
                self._secure_files = SECURE_FILES
            if vendor_files is not None:
                self._vendor_files = vendor_files
            else:
                self._vendor_files = VENDOR_FILES
        else:
            self._config_files = []
            self._secure_files = []
            self._vendor_files = []

        config_file_override = self._get_envvar('OS_CLIENT_CONFIG_FILE')
        if config_file_override:
            self._config_files.insert(0, config_file_override)

        secure_file_override = self._get_envvar('OS_CLIENT_SECURE_FILE')
        if secure_file_override:
            self._secure_files.insert(0, secure_file_override)

        self.defaults = self._defaults_module.get_defaults()
        if override_defaults:
            self.defaults.update(override_defaults)

        # First, use a config file if it exists where expected
        self.config_filename, self.cloud_config = self._load_config_file()
        _, secure_config = self._load_secure_file()
        if secure_config:
            self.cloud_config = _util.merge_clouds(
                self.cloud_config, secure_config)

        if not self.cloud_config:
            self.cloud_config = {'clouds': {}}
        if 'clouds' not in self.cloud_config:
            self.cloud_config['clouds'] = {}

        # Save the other config
        self.extra_config = copy.deepcopy(self.cloud_config)
        self.extra_config.pop('clouds', None)

        # Grab ipv6 preference settings from env
        client_config = self.cloud_config.get('client', {})

        if force_ipv4 is not None:
            # If it's passed in to the constructor, honor it.
            self.force_ipv4 = force_ipv4
        else:
            # Get the backwards compat value
            prefer_ipv6 = get_boolean(
                self._get_envvar(
                    'OS_PREFER_IPV6', client_config.get(
                        'prefer_ipv6', client_config.get(
                            'prefer-ipv6', True))))
            force_ipv4 = get_boolean(
                self._get_envvar(
                    'OS_FORCE_IPV4', client_config.get(
                        'force_ipv4', client_config.get(
                            'broken-ipv6', False))))

            self.force_ipv4 = force_ipv4
            if not prefer_ipv6:
                # this will only be false if someone set it explicitly
                # honor their wishes
                self.force_ipv4 = True

        # Next, process environment variables and add them to the mix
        self.envvar_key = self._get_envvar('OS_CLOUD_NAME', 'envvars')
        if self.envvar_key in self.cloud_config['clouds']:
            raise exceptions.ConfigException(
                '"{0}" defines a cloud named "{1}", but'
                ' OS_CLOUD_NAME is also set to "{1}". Please rename'
                ' either your environment based cloud, or one of your'
                ' file-based clouds.'.format(self.config_filename,
                                             self.envvar_key))

        self.default_cloud = self._get_envvar('OS_CLOUD')

        if load_envvars:
            envvars = self._get_os_environ(envvar_prefix=envvar_prefix)
            if envvars:
                self.cloud_config['clouds'][self.envvar_key] = envvars
                if not self.default_cloud:
                    self.default_cloud = self.envvar_key

        if not self.default_cloud and self.cloud_config['clouds']:
            if len(self.cloud_config['clouds'].keys()) == 1:
                # If there is only one cloud just use it. This matches envvars
                # behavior and allows for much less typing.
                # TODO(mordred) allow someone to mark a cloud as "default" in
                # clouds.yaml.
                # The next/iter thing is for python3 compat where dict.keys
                # returns an iterator but in python2 it's a list.
                self.default_cloud = next(iter(
                    self.cloud_config['clouds'].keys()))

        # Finally, fall through and make a cloud that starts with defaults
        # because we need somewhere to put arguments, and there are neither
        # config files or env vars
        if not self.cloud_config['clouds']:
            self.cloud_config = dict(
                clouds=dict(defaults=dict(self.defaults)))
            self.default_cloud = 'defaults'

        self._cache_auth = False
        self._cache_expiration_time = 0
        self._cache_path = CACHE_PATH
        self._cache_class = 'dogpile.cache.null'
        self._cache_arguments = {}
        self._cache_expirations = {}
        self._influxdb_config = {}
        if 'cache' in self.cloud_config:
            cache_settings = _util.normalize_keys(self.cloud_config['cache'])

            self._cache_auth = get_boolean(
                cache_settings.get('auth', self._cache_auth))

            # expiration_time used to be 'max_age' but the dogpile setting
            # is expiration_time. Support max_age for backwards compat.
            self._cache_expiration_time = cache_settings.get(
                'expiration_time', cache_settings.get(
                    'max_age', self._cache_expiration_time))

            # If cache class is given, use that. If not, but if cache time
            # is given, default to memory. Otherwise, default to nothing.
            # to memory.
            if self._cache_expiration_time:
                self._cache_class = 'dogpile.cache.memory'
            self._cache_class = self.cloud_config['cache'].get(
                'class', self._cache_class)

            self._cache_path = os.path.expanduser(
                cache_settings.get('path', self._cache_path))
            self._cache_arguments = cache_settings.get(
                'arguments', self._cache_arguments)
            self._cache_expirations = cache_settings.get(
                'expiration', self._cache_expirations)

        if load_yaml_config:
            metrics_config = self.cloud_config.get('metrics', {})
            statsd_config = metrics_config.get('statsd', {})
            statsd_host = statsd_host or statsd_config.get('host')
            statsd_port = statsd_port or statsd_config.get('port')
            statsd_prefix = statsd_prefix or statsd_config.get('prefix')

            influxdb_cfg = metrics_config.get('influxdb', {})
            # Parse InfluxDB configuration
            if not influxdb_config:
                influxdb_config = influxdb_cfg
            else:
                influxdb_config.update(influxdb_cfg)

        if influxdb_config:
            config = {}
            if 'use_udp' in influxdb_config:
                use_udp = influxdb_config['use_udp']
                if isinstance(use_udp, str):
                    use_udp = use_udp.lower() in ('true', 'yes', '1')
                elif not isinstance(use_udp, bool):
                    use_udp = False
                    self.log.warning('InfluxDB.use_udp value type is not '
                                     'supported. Use one of '
                                     '[true|false|yes|no|1|0]')
                config['use_udp'] = use_udp
            for key in ['host', 'port', 'username', 'password', 'database',
                        'measurement', 'timeout']:
                if key in influxdb_config:
                    config[key] = influxdb_config[key]
            self._influxdb_config = config

        if load_envvars:
            statsd_host = statsd_host or os.environ.get('STATSD_HOST')
            statsd_port = statsd_port or os.environ.get('STATSD_PORT')
            statsd_prefix = statsd_prefix or os.environ.get('STATSD_PREFIX')

        self._statsd_host = statsd_host
        self._statsd_port = statsd_port
        self._statsd_prefix = statsd_prefix

        # Flag location to hold the peeked value of an argparse timeout value
        self._argv_timeout = False

        # Save the password callback
        # password = self._pw_callback(prompt="Password: ")
        self._pw_callback = pw_func

    def _get_os_environ(self, envvar_prefix=None):
        ret = self._defaults_module.get_defaults()
        if not envvar_prefix:
            # This makes the or below be OS_ or OS_ which is a no-op
            envvar_prefix = 'OS_'
        environkeys = [k for k in os.environ.keys()
                       if (k.startswith('OS_') or k.startswith(envvar_prefix))
                       and not k.startswith('OS_TEST')  # infra CI var
                       and not k.startswith('OS_STD')   # oslotest var
                       and not k.startswith('OS_LOG')   # oslotest var
                       ]
        for k in environkeys:
            newkey = k.split('_', 1)[-1].lower()
            ret[newkey] = os.environ[k]
        # If the only environ keys are selectors or behavior modification,
        # don't return anything
        selectors = set([
            'OS_CLOUD', 'OS_REGION_NAME',
            'OS_CLIENT_CONFIG_FILE', 'OS_CLIENT_SECURE_FILE', 'OS_CLOUD_NAME'])
        if set(environkeys) - selectors:
            return ret
        return None

    def _get_envvar(self, key, default=None):
        if not self._load_envvars:
            return default
        return os.environ.get(key, default)

    def get_extra_config(self, key, defaults=None):
        """Fetch an arbitrary extra chunk of config, laying in defaults.

        :param string key: name of the config section to fetch
        :param dict defaults: (optional) default values to merge under the
                                         found config
        """
        defaults = _util.normalize_keys(defaults or {})
        if not key:
            return defaults
        return _util.merge_clouds(
            defaults,
            _util.normalize_keys(self.cloud_config.get(key, {})))

    def _load_config_file(self):
        return self._load_yaml_json_file(self._config_files)

    def _load_secure_file(self):
        return self._load_yaml_json_file(self._secure_files)

    def _load_vendor_file(self):
        return self._load_yaml_json_file(self._vendor_files)

    def _load_yaml_json_file(self, filelist):
        for path in filelist:
            if os.path.exists(path):
                try:
                    with open(path, 'r') as f:
                        if path.endswith('json'):
                            return path, json.load(f)
                        else:
                            return path, yaml.safe_load(f)
                except IOError as e:
                    if e.errno == errno.EACCES:
                        # Can't access file so let's continue to the next
                        # file
                        continue
        return (None, {})

    def _expand_region_name(self, region_name):
        return {'name': region_name, 'values': {}}

    def _expand_regions(self, regions):
        ret = []
        for region in regions:
            if isinstance(region, dict):
                # i.e. must have name key, and only name,values keys
                if 'name' not in region or \
                   not {'name', 'values'} >= set(region):
                    raise exceptions.ConfigException(
                        'Invalid region entry at: %s' % region)
                if 'values' not in region:
                    region['values'] = {}
                ret.append(copy.deepcopy(region))
            else:
                ret.append(self._expand_region_name(region))
        return ret

    def _get_regions(self, cloud):
        if cloud not in self.cloud_config['clouds']:
            return [self._expand_region_name('')]
        regions = self._get_known_regions(cloud)
        if not regions:
            # We don't know of any regions use a workable default.
            regions = [self._expand_region_name('')]
        return regions

    def _get_known_regions(self, cloud):
        config = _util.normalize_keys(self.cloud_config['clouds'][cloud])
        if 'regions' in config:
            return self._expand_regions(config['regions'])
        elif 'region_name' in config:
            if isinstance(config['region_name'], list):
                regions = config['region_name']
            else:
                regions = config['region_name'].split(',')
            if len(regions) > 1:
                warnings.warn(
                    "Comma separated lists in region_name are deprecated."
                    " Please use a yaml list in the regions"
                    " parameter in {0} instead.".format(self.config_filename))
            return self._expand_regions(regions)
        else:
            # crappit. we don't have a region defined.
            new_cloud = dict()
            our_cloud = self.cloud_config['clouds'].get(cloud, dict())
            self._expand_vendor_profile(cloud, new_cloud, our_cloud)
            if 'regions' in new_cloud and new_cloud['regions']:
                return self._expand_regions(new_cloud['regions'])
            elif 'region_name' in new_cloud and new_cloud['region_name']:
                return [self._expand_region_name(new_cloud['region_name'])]

    def _get_region(self, cloud=None, region_name=''):
        if region_name is None:
            region_name = ''
        if not cloud:
            return self._expand_region_name(region_name)

        regions = self._get_known_regions(cloud)
        if not regions:
            return self._expand_region_name(region_name)

        if not region_name:
            return regions[0]

        for region in regions:
            if region['name'] == region_name:
                return region

        raise exceptions.ConfigException(
            'Region {region_name} is not a valid region name for cloud'
            ' {cloud}. Valid choices are {region_list}. Please note that'
            ' region names are case sensitive.'.format(
                region_name=region_name,
                region_list=','.join([r['name'] for r in regions]),
                cloud=cloud))

    def get_cloud_names(self):
        return self.cloud_config['clouds'].keys()

    def _get_base_cloud_config(self, name, profile=None):
        cloud = dict()

        # Only validate cloud name if one was given
        if name and name not in self.cloud_config['clouds']:
            raise exceptions.ConfigException(
                "Cloud {name} was not found.".format(
                    name=name))

        our_cloud = self.cloud_config['clouds'].get(name, dict())
        if profile:
            our_cloud['profile'] = profile

        # Get the defaults
        cloud.update(self.defaults)
        self._expand_vendor_profile(name, cloud, our_cloud)

        if 'auth' not in cloud:
            cloud['auth'] = dict()

        _auth_update(cloud, our_cloud)
        if 'cloud' in cloud:
            del cloud['cloud']

        return cloud

    def _expand_vendor_profile(self, name, cloud, our_cloud):
        # Expand a profile if it exists. 'cloud' is an old confusing name
        # for this.
        profile_name = our_cloud.get('profile', our_cloud.get('cloud', None))
        if not profile_name or profile_name == self.envvar_key:
            return
        if 'cloud' in our_cloud:
            warnings.warn(
                "{0} uses the keyword 'cloud' to reference a known "
                "vendor profile. This has been deprecated in favor of the "
                "'profile' keyword.".format(self.config_filename))

        vendor_filename, vendor_file = self._load_vendor_file()
        if (vendor_file and 'public-clouds' in vendor_file
                and profile_name in vendor_file['public-clouds']):
            _auth_update(cloud, vendor_file['public-clouds'][profile_name])
        else:
            profile_data = vendors.get_profile(profile_name)
            if profile_data:
                nested_profile = profile_data.pop('profile', None)
                if nested_profile:
                    nested_profile_data = vendors.get_profile(nested_profile)
                    if nested_profile_data:
                        profile_data = nested_profile_data
                status = profile_data.pop('status', 'active')
                message = profile_data.pop('message', '')
                if status == 'deprecated':
                    warnings.warn(
                        "{profile_name} is deprecated: {message}".format(
                            profile_name=profile_name, message=message))
                elif status == 'shutdown':
                    raise exceptions.ConfigException(
                        "{profile_name} references a cloud that no longer"
                        " exists: {message}".format(
                            profile_name=profile_name, message=message))
                _auth_update(cloud, profile_data)
            else:
                # Can't find the requested vendor config, go about business
                warnings.warn("Couldn't find the vendor profile '{0}', for"
                              " the cloud '{1}'".format(profile_name,
                                                        name))

    def _project_scoped(self, cloud):
        return ('project_id' in cloud or 'project_name' in cloud
                or 'project_id' in cloud['auth']
                or 'project_name' in cloud['auth'])

    def _validate_networks(self, networks, key):
        value = None
        for net in networks:
            if value and net[key]:
                raise exceptions.ConfigException(
                    "Duplicate network entries for {key}: {net1} and {net2}."
                    " Only one network can be flagged with {key}".format(
                        key=key,
                        net1=value['name'],
                        net2=net['name']))
            if not value and net[key]:
                value = net

    def _fix_backwards_networks(self, cloud):
        # Leave the external_network and internal_network keys in the
        # dict because consuming code might be expecting them.
        networks = []
        # Normalize existing network entries
        for net in cloud.get('networks', []):
            name = net.get('name')
            if not name:
                raise exceptions.ConfigException(
                    'Entry in network list is missing required field "name".')
            network = dict(
                name=name,
                routes_externally=get_boolean(net.get('routes_externally')),
                nat_source=get_boolean(net.get('nat_source')),
                nat_destination=get_boolean(net.get('nat_destination')),
                default_interface=get_boolean(net.get('default_interface')),
            )
            # routes_ipv4_externally defaults to the value of routes_externally
            network['routes_ipv4_externally'] = get_boolean(
                net.get(
                    'routes_ipv4_externally', network['routes_externally']))
            # routes_ipv6_externally defaults to the value of routes_externally
            network['routes_ipv6_externally'] = get_boolean(
                net.get(
                    'routes_ipv6_externally', network['routes_externally']))
            networks.append(network)

        for key in ('external_network', 'internal_network'):
            external = key.startswith('external')
            if key in cloud and 'networks' in cloud:
                raise exceptions.ConfigException(
                    "Both {key} and networks were specified in the config."
                    " Please remove {key} from the config and use the network"
                    " list to configure network behavior.".format(key=key))
            if key in cloud:
                warnings.warn(
                    "{key} is deprecated. Please replace with an entry in"
                    " a dict inside of the networks list with name: {name}"
                    " and routes_externally: {external}".format(
                        key=key, name=cloud[key], external=external))
                networks.append(dict(
                    name=cloud[key],
                    routes_externally=external,
                    nat_destination=not external,
                    default_interface=external))

        # Validate that we don't have duplicates
        self._validate_networks(networks, 'nat_destination')
        self._validate_networks(networks, 'default_interface')

        cloud['networks'] = networks
        return cloud

    def _handle_domain_id(self, cloud):
        # Allow people to just specify domain once if it's the same
        mappings = {
            'domain_id': ('user_domain_id', 'project_domain_id'),
            'domain_name': ('user_domain_name', 'project_domain_name'),
        }
        for target_key, possible_values in mappings.items():
            if not self._project_scoped(cloud):
                if target_key in cloud and target_key not in cloud['auth']:
                    cloud['auth'][target_key] = cloud.pop(target_key)
                continue
            for key in possible_values:
                if target_key in cloud['auth'] and key not in cloud['auth']:
                    cloud['auth'][key] = cloud['auth'][target_key]
            cloud.pop(target_key, None)
            cloud['auth'].pop(target_key, None)
        return cloud

    def _fix_backwards_project(self, cloud):
        # Do the lists backwards so that project_name is the ultimate winner
        # Also handle moving domain names into auth so that domain mapping
        # is easier
        mappings = {
            'domain_id': ('domain_id', 'domain-id'),
            'domain_name': ('domain_name', 'domain-name'),
            'user_domain_id': ('user_domain_id', 'user-domain-id'),
            'user_domain_name': ('user_domain_name', 'user-domain-name'),
            'project_domain_id': ('project_domain_id', 'project-domain-id'),
            'project_domain_name': (
                'project_domain_name', 'project-domain-name'),
            'token': ('auth-token', 'auth_token', 'token'),
        }
        if cloud.get('auth_type', None) == 'v2password':
            # If v2password is explcitly requested, this is to deal with old
            # clouds. That's fine - we need to map settings in the opposite
            # direction
            mappings['tenant_id'] = (
                'project_id', 'project-id', 'tenant_id', 'tenant-id')
            mappings['tenant_name'] = (
                'project_name', 'project-name', 'tenant_name', 'tenant-name')
        else:
            mappings['project_id'] = (
                'tenant_id', 'tenant-id', 'project_id', 'project-id')
            mappings['project_name'] = (
                'tenant_name', 'tenant-name', 'project_name', 'project-name')
        for target_key, possible_values in mappings.items():
            target = None
            for key in possible_values:
                if key in cloud:
                    target = str(cloud[key])
                    del cloud[key]
                if key in cloud['auth']:
                    target = str(cloud['auth'][key])
                    del cloud['auth'][key]
            if target:
                cloud['auth'][target_key] = target
        return cloud

    def _fix_backwards_auth_plugin(self, cloud):
        # Do the lists backwards so that auth_type is the ultimate winner
        mappings = {
            'auth_type': ('auth_plugin', 'auth_type'),
        }
        for target_key, possible_values in mappings.items():
            target = None
            for key in possible_values:
                if key in cloud:
                    target = cloud[key]
                    del cloud[key]
            cloud[target_key] = target
        # Because we force alignment to v3 nouns, we want to force
        # use of the auth plugin that can do auto-selection and dealing
        # with that based on auth parameters. v2password is basically
        # completely broken
        return cloud

    def register_argparse_arguments(self, parser, argv, service_keys=None):
        """Register all of the common argparse options needed.

        Given an argparse parser, register the keystoneauth Session arguments,
        the keystoneauth Auth Plugin Options and os-cloud. Also, peek in the
        argv to see if all of the auth plugin options should be registered
        or merely the ones already configured.

        :param argparse.ArgumentParser: parser to attach argparse options to
        :param argv: the arguments provided to the application
        :param string service_keys: Service or list of services this argparse
                                    should be specialized for, if known.
                                    The first item in the list will be used
                                    as the default value for service_type
                                    (optional)

        :raises exceptions.ConfigException if an invalid auth-type is requested
        """

        if service_keys is None:
            service_keys = []

        # Fix argv in place - mapping any keys with embedded _ in them to -
        _fix_argv(argv)

        local_parser = argparse_mod.ArgumentParser(add_help=False)

        for p in (parser, local_parser):
            p.add_argument(
                '--os-cloud',
                metavar='<name>',
                default=self._get_envvar('OS_CLOUD', None),
                help='Named cloud to connect to')

        # we need to peek to see if timeout was actually passed, since
        # the keystoneauth declaration of it has a default, which means
        # we have no clue if the value we get is from the ksa default
        # for from the user passing it explicitly. We'll stash it for later
        local_parser.add_argument('--timeout', metavar='<timeout>')

        # We need for get_one to be able to peek at whether a token
        # was passed so that we can swap the default from password to
        # token if it was. And we need to also peek for --os-auth-token
        # for novaclient backwards compat
        local_parser.add_argument('--os-token')
        local_parser.add_argument('--os-auth-token')

        # Peek into the future and see if we have an auth-type set in
        # config AND a cloud set, so that we know which command line
        # arguments to register and show to the user (the user may want
        # to say something like:
        #   openstack --os-cloud=foo --os-oidctoken=bar
        # although I think that user is the cause of my personal pain
        options, _args = local_parser.parse_known_args(argv)
        if options.timeout:
            self._argv_timeout = True

        # validate = False because we're not _actually_ loading here
        # we're only peeking, so it's the wrong time to assert that
        # the rest of the arguments given are invalid for the plugin
        # chosen (for instance, --help may be requested, so that the
        # user can see what options he may want to give
        cloud_region = self.get_one(argparse=options, validate=False)
        default_auth_type = cloud_region.config['auth_type']

        try:
            loading.register_auth_argparse_arguments(
                parser, argv, default=default_auth_type)
        except Exception:
            # Hidiing the keystoneauth exception because we're not actually
            # loading the auth plugin at this point, so the error message
            # from it doesn't actually make sense to os-client-config users
            options, _args = parser.parse_known_args(argv)
            plugin_names = loading.get_available_plugin_names()
            raise exceptions.ConfigException(
                "An invalid auth-type was specified: {auth_type}."
                " Valid choices are: {plugin_names}.".format(
                    auth_type=options.os_auth_type,
                    plugin_names=",".join(plugin_names)))

        if service_keys:
            primary_service = service_keys[0]
        else:
            primary_service = None
        loading.register_session_argparse_arguments(parser)
        adapter.register_adapter_argparse_arguments(
            parser, service_type=primary_service)
        for service_key in service_keys:
            # legacy clients have un-prefixed api-version options
            parser.add_argument(
                '--{service_key}-api-version'.format(
                    service_key=service_key.replace('_', '-')),
                help=argparse_mod.SUPPRESS)
            adapter.register_service_adapter_argparse_arguments(
                parser, service_type=service_key)

        # Backwards compat options for legacy clients
        parser.add_argument('--http-timeout', help=argparse_mod.SUPPRESS)
        parser.add_argument('--os-endpoint-type', help=argparse_mod.SUPPRESS)
        parser.add_argument('--endpoint-type', help=argparse_mod.SUPPRESS)

    def _fix_backwards_interface(self, cloud):
        new_cloud = {}
        for key in cloud.keys():
            if key.endswith('endpoint_type'):
                target_key = key.replace('endpoint_type', 'interface')
            else:
                target_key = key
            new_cloud[target_key] = cloud[key]
        return new_cloud

    def _fix_backwards_api_timeout(self, cloud):
        new_cloud = {}
        # requests can only have one timeout, which means that in a single
        # cloud there is no point in different timeout values. However,
        # for some reason many of the legacy clients decided to shove their
        # service name in to the arg name for reasons surpassin sanity. If
        # we find any values that are not api_timeout, overwrite api_timeout
        # with the value
        service_timeout = None
        for key in cloud.keys():
            if key.endswith('timeout') and not (
                    key == 'timeout' or key == 'api_timeout'):
                service_timeout = cloud[key]
            else:
                new_cloud[key] = cloud[key]
        if service_timeout is not None:
            new_cloud['api_timeout'] = service_timeout
        # The common argparse arg from keystoneauth is called timeout, but
        # os-client-config expects it to be called api_timeout
        if self._argv_timeout:
            if 'timeout' in new_cloud and new_cloud['timeout']:
                new_cloud['api_timeout'] = new_cloud.pop('timeout')
        return new_cloud

    def get_all(self):

        clouds = []

        for cloud in self.get_cloud_names():
            for region in self._get_regions(cloud):
                if region:
                    clouds.append(self.get_one(
                        cloud, region_name=region['name']))
        return clouds
    # TODO(mordred) Backwards compat for OSC transition
    get_all_clouds = get_all

    def _fix_args(self, args=None, argparse=None):
        """Massage the passed-in options

        Replace - with _ and strip os_ prefixes.

        Convert an argparse Namespace object to a dict, removing values
        that are either None or ''.
        """
        if not args:
            args = {}

        if argparse:
            # Convert the passed-in Namespace
            o_dict = vars(argparse)
            parsed_args = dict()
            for k in o_dict:
                if o_dict[k] is not None and o_dict[k] != '':
                    parsed_args[k] = o_dict[k]
            args.update(parsed_args)

        os_args = dict()
        new_args = dict()
        for (key, val) in iter(args.items()):
            if type(args[key]) == dict:
                # dive into the auth dict
                new_args[key] = self._fix_args(args[key])
                continue

            key = key.replace('-', '_')
            if key.startswith('os_'):
                os_args[key[3:]] = val
            else:
                new_args[key] = val
        new_args.update(os_args)
        return new_args

    def _find_winning_auth_value(self, opt, config):
        opt_name = opt.name.replace('-', '_')
        if opt_name in config:
            return config[opt_name]
        else:
            deprecated = getattr(opt, 'deprecated', getattr(
                opt, 'deprecated_opts', []))
            for d_opt in deprecated:
                d_opt_name = d_opt.name.replace('-', '_')
                if d_opt_name in config:
                    return config[d_opt_name]

    def auth_config_hook(self, config):
        """Allow examination of config values before loading auth plugin

        OpenStackClient will override this to perform additional checks
        on auth_type.
        """
        return config

    def _get_auth_loader(self, config):
        # Use the 'none' plugin for variants of None specified,
        # since it does not look up endpoints or tokens but rather
        # does a passthrough. This is useful for things like Ironic
        # that have a keystoneless operational mode, but means we're
        # still dealing with a keystoneauth Session object, so all the
        # _other_ things (SSL arg handling, timeout) all work consistently
        if config['auth_type'] in (None, "None", ''):
            config['auth_type'] = 'none'
        elif config['auth_type'] == 'token_endpoint':
            # Humans have been trained to use a thing called token_endpoint
            # That it does not exist in keystoneauth is irrelvant- it not
            # doing what they want causes them sorrow.
            config['auth_type'] = 'admin_token'
        return loading.get_plugin_loader(config['auth_type'])

    def _validate_auth(self, config, loader):
        # May throw a keystoneauth1.exceptions.NoMatchingPlugin

        plugin_options = loader.get_options()

        for p_opt in plugin_options:
            # if it's in config.auth, win, kill it from config dict
            # if it's in config and not in config.auth, move it
            # deprecated loses to current
            # provided beats default, deprecated or not
            winning_value = self._find_winning_auth_value(
                p_opt,
                config['auth'],
            )
            if not winning_value:
                winning_value = self._find_winning_auth_value(
                    p_opt,
                    config,
                )

            config = self._clean_up_after_ourselves(
                config,
                p_opt,
                winning_value,
            )

            if winning_value:
                # Prefer the plugin configuration dest value if the value's key
                # is marked as deprecated.
                if p_opt.dest is None:
                    good_name = p_opt.name.replace('-', '_')
                    config['auth'][good_name] = winning_value
                else:
                    config['auth'][p_opt.dest] = winning_value

            # See if this needs a prompting
            config = self.option_prompt(config, p_opt)

        return config

    def _validate_auth_correctly(self, config, loader):
        # May throw a keystoneauth1.exceptions.NoMatchingPlugin

        plugin_options = loader.get_options()

        for p_opt in plugin_options:
            # if it's in config, win, move it and kill it from config dict
            # if it's in config.auth but not in config it's good
            # deprecated loses to current
            # provided beats default, deprecated or not
            winning_value = self._find_winning_auth_value(
                p_opt,
                config,
            )
            if not winning_value:
                winning_value = self._find_winning_auth_value(
                    p_opt,
                    config['auth'],
                )

            config = self._clean_up_after_ourselves(
                config,
                p_opt,
                winning_value,
            )

            # See if this needs a prompting
            config = self.option_prompt(config, p_opt)

        return config

    def option_prompt(self, config, p_opt):
        """Prompt user for option that requires a value"""
        if (
                getattr(p_opt, 'prompt', None) is not None
                and p_opt.dest not in config['auth']
                and self._pw_callback is not None
        ):
            config['auth'][p_opt.dest] = self._pw_callback(p_opt.prompt)
        return config

    def _clean_up_after_ourselves(self, config, p_opt, winning_value):

        # Clean up after ourselves
        for opt in [p_opt.name] + [o.name for o in p_opt.deprecated]:
            opt = opt.replace('-', '_')
            config.pop(opt, None)
            config['auth'].pop(opt, None)

        if winning_value:
            # Prefer the plugin configuration dest value if the value's key
            # is marked as depreciated.
            if p_opt.dest is None:
                config['auth'][p_opt.name.replace('-', '_')] = (
                    winning_value)
            else:
                config['auth'][p_opt.dest] = winning_value
        return config

    def magic_fixes(self, config):
        """Perform the set of magic argument fixups"""

        # Infer token plugin if a token was given
        if (('auth' in config and 'token' in config['auth'])
                or ('auth_token' in config and config['auth_token'])
                or ('token' in config and config['token'])):
            config.setdefault('token', config.pop('auth_token', None))

        # Infer passcode if it was given separately
        # This is generally absolutely impractical to require setting passcode
        # in the clouds.yaml
        if 'auth' in config and 'passcode' in config:
            config['auth']['passcode'] = config.pop('passcode', None)

        # These backwards compat values are only set via argparse. If it's
        # there, it's because it was passed in explicitly, and should win
        config = self._fix_backwards_api_timeout(config)
        if 'endpoint_type' in config:
            config['interface'] = config.pop('endpoint_type')

        config = self._fix_backwards_auth_plugin(config)
        config = self._fix_backwards_project(config)
        config = self._fix_backwards_interface(config)
        config = self._fix_backwards_networks(config)
        config = self._handle_domain_id(config)

        for key in BOOL_KEYS:
            if key in config:
                if type(config[key]) is not bool:
                    config[key] = get_boolean(config[key])

        # TODO(mordred): Special casing auth_url here. We should
        #                come back to this betterer later so that it's
        #                more generalized
        if 'auth' in config and 'auth_url' in config['auth']:
            config['auth']['auth_url'] = config['auth']['auth_url'].format(
                **config)

        return config

    def get_one(
            self, cloud=None, validate=True, argparse=None, **kwargs):
        """Retrieve a single CloudRegion and merge additional options

        :param string cloud:
            The name of the configuration to load from clouds.yaml
        :param boolean validate:
            Validate the config. Setting this to False causes no auth plugin
            to be created. It's really only useful for testing.
        :param Namespace argparse:
            An argparse Namespace object; allows direct passing in of
            argparse options to be added to the cloud config.  Values
            of None and '' will be removed.
        :param region_name: Name of the region of the cloud.
        :param kwargs: Additional configuration options

        :returns: openstack.config.cloud_region.CloudRegion
        :raises: keystoneauth1.exceptions.MissingRequiredOptions
            on missing required auth parameters
        """

        profile = kwargs.pop('profile', None)
        args = self._fix_args(kwargs, argparse=argparse)

        if cloud is None:
            if 'cloud' in args:
                cloud = args['cloud']
            else:
                cloud = self.default_cloud

        config = self._get_base_cloud_config(cloud, profile)

        # Get region specific settings
        if 'region_name' not in args:
            args['region_name'] = ''
        region = self._get_region(cloud=cloud, region_name=args['region_name'])
        args['region_name'] = region['name']
        region_args = copy.deepcopy(region['values'])

        # Regions is a list that we can use to create a list of cloud/region
        # objects. It does not belong in the single-cloud dict
        config.pop('regions', None)

        # Can't just do update, because None values take over
        for arg_list in region_args, args:
            for (key, val) in iter(arg_list.items()):
                if val is not None:
                    if key == 'auth' and config[key] is not None:
                        config[key] = _auth_update(config[key], val)
                    else:
                        config[key] = val

        config = self.magic_fixes(config)
        config = _util.normalize_keys(config)

        # NOTE(dtroyer): OSC needs a hook into the auth args before the
        #                plugin is loaded in order to maintain backward-
        #                compatible behaviour
        config = self.auth_config_hook(config)

        if validate:
            loader = self._get_auth_loader(config)
            config = self._validate_auth(config, loader)
            auth_plugin = loader.load_from_options(**config['auth'])
        else:
            auth_plugin = None

        # If any of the defaults reference other values, we need to expand
        for (key, value) in config.items():
            if hasattr(value, 'format') and key not in FORMAT_EXCLUSIONS:
                config[key] = value.format(**config)

        force_ipv4 = config.pop('force_ipv4', self.force_ipv4)
        prefer_ipv6 = config.pop('prefer_ipv6', True)
        if not prefer_ipv6:
            force_ipv4 = True

        # Override global metrics config with more specific per-cloud
        # details.
        metrics_config = config.get('metrics', {})
        statsd_config = metrics_config.get('statsd', {})
        statsd_host = statsd_config.get('host') or self._statsd_host
        statsd_port = statsd_config.get('port') or self._statsd_port
        statsd_prefix = statsd_config.get('prefix') or self._statsd_prefix
        influxdb_config = metrics_config.get('influxdb', {})
        if influxdb_config:
            merged_influxdb = copy.deepcopy(self._influxdb_config)
            merged_influxdb.update(influxdb_config)
            influxdb_config = merged_influxdb
        else:
            influxdb_config = self._influxdb_config

        if cloud is None:
            cloud_name = ''
        else:
            cloud_name = str(cloud)
        return self._cloud_region_class(
            name=cloud_name,
            region_name=config['region_name'],
            config=config,
            extra_config=self.extra_config,
            force_ipv4=force_ipv4,
            auth_plugin=auth_plugin,
            openstack_config=self,
            session_constructor=self._session_constructor,
            app_name=self._app_name,
            app_version=self._app_version,
            cache_auth=self._cache_auth,
            cache_expiration_time=self._cache_expiration_time,
            cache_expirations=self._cache_expirations,
            cache_path=self._cache_path,
            cache_class=self._cache_class,
            cache_arguments=self._cache_arguments,
            password_callback=self._pw_callback,
            statsd_host=statsd_host,
            statsd_port=statsd_port,
            statsd_prefix=statsd_prefix,
            influxdb_config=influxdb_config,
        )
    # TODO(mordred) Backwards compat for OSC transition
    get_one_cloud = get_one

    def get_one_cloud_osc(
        self,
        cloud=None,
        validate=True,
        argparse=None,
        **kwargs
    ):
        """Retrieve a single CloudRegion and merge additional options

        :param string cloud:
            The name of the configuration to load from clouds.yaml
        :param boolean validate:
            Validate the config. Setting this to False causes no auth plugin
            to be created. It's really only useful for testing.
        :param Namespace argparse:
            An argparse Namespace object; allows direct passing in of
            argparse options to be added to the cloud config.  Values
            of None and '' will be removed.
        :param region_name: Name of the region of the cloud.
        :param kwargs: Additional configuration options

        :raises: keystoneauth1.exceptions.MissingRequiredOptions
            on missing required auth parameters
        """

        args = self._fix_args(kwargs, argparse=argparse)

        if cloud is None:
            if 'cloud' in args:
                cloud = args['cloud']
            else:
                cloud = self.default_cloud

        config = self._get_base_cloud_config(cloud)

        # Get region specific settings
        if 'region_name' not in args:
            args['region_name'] = ''
        region = self._get_region(cloud=cloud, region_name=args['region_name'])
        args['region_name'] = region['name']
        region_args = copy.deepcopy(region['values'])

        # Regions is a list that we can use to create a list of cloud/region
        # objects. It does not belong in the single-cloud dict
        config.pop('regions', None)

        # Can't just do update, because None values take over
        for arg_list in region_args, args:
            for (key, val) in iter(arg_list.items()):
                if val is not None:
                    if key == 'auth' and config[key] is not None:
                        config[key] = _auth_update(config[key], val)
                    else:
                        config[key] = val

        config = self.magic_fixes(config)

        # NOTE(dtroyer): OSC needs a hook into the auth args before the
        #                plugin is loaded in order to maintain backward-
        #                compatible behaviour
        config = self.auth_config_hook(config)

        if validate:
            loader = self._get_auth_loader(config)
            config = self._validate_auth_correctly(config, loader)
            auth_plugin = loader.load_from_options(**config['auth'])
        else:
            auth_plugin = None

        # If any of the defaults reference other values, we need to expand
        for (key, value) in config.items():
            if hasattr(value, 'format') and key not in FORMAT_EXCLUSIONS:
                config[key] = value.format(**config)

        force_ipv4 = config.pop('force_ipv4', self.force_ipv4)
        prefer_ipv6 = config.pop('prefer_ipv6', True)
        if not prefer_ipv6:
            force_ipv4 = True

        if cloud is None:
            cloud_name = ''
        else:
            cloud_name = str(cloud)
        return self._cloud_region_class(
            name=cloud_name,
            region_name=config['region_name'],
            config=config,
            extra_config=self.extra_config,
            force_ipv4=force_ipv4,
            auth_plugin=auth_plugin,
            openstack_config=self,
            cache_auth=self._cache_auth,
            cache_expiration_time=self._cache_expiration_time,
            cache_expirations=self._cache_expirations,
            cache_path=self._cache_path,
            cache_class=self._cache_class,
            cache_arguments=self._cache_arguments,
            password_callback=self._pw_callback,
        )

    @staticmethod
    def set_one_cloud(config_file, cloud, set_config=None):
        """Set a single cloud configuration.

        :param string config_file:
            The path to the config file to edit. If this file does not exist
            it will be created.
        :param string cloud:
            The name of the configuration to save to clouds.yaml
        :param dict set_config: Configuration options to be set
        """

        set_config = set_config or {}
        cur_config = {}
        try:
            with open(config_file) as fh:
                cur_config = yaml.safe_load(fh)
        except IOError as e:
            # Not no such file
            if e.errno != 2:
                raise
            pass

        clouds_config = cur_config.get('clouds', {})
        cloud_config = _auth_update(clouds_config.get(cloud, {}), set_config)
        clouds_config[cloud] = cloud_config
        cur_config['clouds'] = clouds_config

        with open(config_file, 'w') as fh:
            yaml.safe_dump(cur_config, fh, default_flow_style=False)


if __name__ == '__main__':
    config = OpenStackConfig().get_all_clouds()
    for cloud in config:
        print_cloud = False
        if len(sys.argv) == 1:
            print_cloud = True
        elif len(sys.argv) == 3 and (
                sys.argv[1] == cloud.name and sys.argv[2] == cloud.region):
            print_cloud = True
        elif len(sys.argv) == 2 and (
                sys.argv[1] == cloud.name):
            print_cloud = True

        if print_cloud:
            print(cloud.name, cloud.region, cloud.config)
