# -*- coding: utf-8 -*-
# Copyright 2016 Openmarket
#
# 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.

from synapse.util.module_loader import load_module

from ._base import Config

LDAP_PROVIDER = 'ldap_auth_provider.LdapAuthProvider'


class PasswordAuthProviderConfig(Config):
    def read_config(self, config):
        self.password_providers = []
        providers = []

        # We want to be backwards compatible with the old `ldap_config`
        # param.
        ldap_config = config.get("ldap_config", {})
        if ldap_config.get("enabled", False):
            providers.append({
                'module': LDAP_PROVIDER,
                'config': ldap_config,
            })

        providers.extend(config.get("password_providers", []))
        for provider in providers:
            mod_name = provider['module']

            # This is for backwards compat when the ldap auth provider resided
            # in this package.
            if mod_name == "synapse.util.ldap_auth_provider.LdapAuthProvider":
                mod_name = LDAP_PROVIDER

            (provider_class, provider_config) = load_module({
                "module": mod_name,
                "config": provider['config'],
            })

            self.password_providers.append((provider_class, provider_config))

    def default_config(self, **kwargs):
        return """\
        # password_providers:
        #     - module: "ldap_auth_provider.LdapAuthProvider"
        #       config:
        #         enabled: true
        #         uri: "ldap://ldap.example.com:389"
        #         start_tls: true
        #         base: "ou=users,dc=example,dc=com"
        #         attributes:
        #            uid: "cn"
        #            mail: "email"
        #            name: "givenName"
        #         #bind_dn:
        #         #bind_password:
        #         #filter: "(objectClass=posixAccount)"
        """
