#!/usr/bin/python
from __future__ import (absolute_import, division, print_function)
# Copyright 2019-2020 Fortinet, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

__metaclass__ = type

ANSIBLE_METADATA = {'status': ['preview'],
                    'supported_by': 'community',
                    'metadata_version': '1.1'}

DOCUMENTATION = '''
---
module: fortios_firewall_ssl_setting
short_description: SSL proxy settings in Fortinet's FortiOS and FortiGate.
description:
    - This module is able to configure a FortiGate or FortiOS (FOS) device by allowing the
      user to set and modify firewall_ssl feature and setting category.
      Examples include all parameters and values need to be adjusted to datasources before usage.
      Tested with FOS v6.0.0
version_added: "2.8"
author:
    - Link Zheng (@chillancezen)
    - Jie Xue (@JieX19)
    - Hongbin Lu (@fgtdev-hblu)
    - Frank Shen (@frankshen01)
    - Miguel Angel Munoz (@mamunozgonzalez)
    - Nicolas Thomas (@thomnico)
notes:
    - Legacy fortiosapi has been deprecated, httpapi is the preferred way to run playbooks

requirements:
    - ansible>=2.9.0
options:
    access_token:
        description:
            - Token-based authentication.
              Generated from GUI of Fortigate.
        type: str
        required: false
    vdom:
        description:
            - Virtual domain, among those defined previously. A vdom is a
              virtual instance of the FortiGate that can be configured and
              used as a different unit.
        type: str
        default: root

    firewall_ssl_setting:
        description:
            - SSL proxy settings.
        default: null
        type: dict
        suboptions:
            abbreviate_handshake:
                description:
                    - Enable/disable use of SSL abbreviated handshake.
                type: str
                choices:
                    - enable
                    - disable
            cert_cache_capacity:
                description:
                    - Maximum capacity of the host certificate cache (0 - 500).
                type: int
            cert_cache_timeout:
                description:
                    - Time limit to keep certificate cache (1 - 120 min).
                type: int
            kxp_queue_threshold:
                description:
                    - Maximum length of the CP KXP queue. When the queue becomes full, the proxy switches cipher functions to the main CPU (0 - 512).
                type: int
            no_matching_cipher_action:
                description:
                    - Bypass or drop the connection when no matching cipher is found.
                type: str
                choices:
                    - bypass
                    - drop
            proxy_connect_timeout:
                description:
                    - Time limit to make an internal connection to the appropriate proxy process (1 - 60 sec).
                type: int
            session_cache_capacity:
                description:
                    - Capacity of the SSL session cache (--Obsolete--) (1 - 1000).
                type: int
            session_cache_timeout:
                description:
                    - Time limit to keep SSL session state (1 - 60 min).
                type: int
            ssl_dh_bits:
                description:
                    - Bit-size of Diffie-Hellman (DH) prime used in DHE-RSA negotiation .
                type: str
                choices:
                    - 768
                    - 1024
                    - 1536
                    - 2048
            ssl_queue_threshold:
                description:
                    - Maximum length of the CP SSL queue. When the queue becomes full, the proxy switches cipher functions to the main CPU (0 - 512).
                type: int
            ssl_send_empty_frags:
                description:
                    - Enable/disable sending empty fragments to avoid attack on CBC IV (for SSL 3.0 and TLS 1.0 only).
                type: str
                choices:
                    - enable
                    - disable
'''

EXAMPLES = '''
- hosts: fortigates
  collections:
    - fortinet.fortios
  connection: httpapi
  vars:
   vdom: "root"
   ansible_httpapi_use_ssl: yes
   ansible_httpapi_validate_certs: no
   ansible_httpapi_port: 443
  tasks:
  - name: SSL proxy settings.
    fortios_firewall_ssl_setting:
      vdom:  "{{ vdom }}"
      firewall_ssl_setting:
        abbreviate_handshake: "enable"
        cert_cache_capacity: "4"
        cert_cache_timeout: "5"
        kxp_queue_threshold: "6"
        no_matching_cipher_action: "bypass"
        proxy_connect_timeout: "8"
        session_cache_capacity: "9"
        session_cache_timeout: "10"
        ssl_dh_bits: "768"
        ssl_queue_threshold: "12"
        ssl_send_empty_frags: "enable"

'''

RETURN = '''
build:
  description: Build number of the fortigate image
  returned: always
  type: str
  sample: '1547'
http_method:
  description: Last method used to provision the content into FortiGate
  returned: always
  type: str
  sample: 'PUT'
http_status:
  description: Last result given by FortiGate on last operation applied
  returned: always
  type: str
  sample: "200"
mkey:
  description: Master key (id) used in the last call to FortiGate
  returned: success
  type: str
  sample: "id"
name:
  description: Name of the table used to fulfill the request
  returned: always
  type: str
  sample: "urlfilter"
path:
  description: Path of the table used to fulfill the request
  returned: always
  type: str
  sample: "webfilter"
revision:
  description: Internal revision number
  returned: always
  type: str
  sample: "17.0.2.10658"
serial:
  description: Serial number of the unit
  returned: always
  type: str
  sample: "FGVMEVYYQT3AB5352"
status:
  description: Indication of the operation's result
  returned: always
  type: str
  sample: "success"
vdom:
  description: Virtual domain used
  returned: always
  type: str
  sample: "root"
version:
  description: Version of the FortiGate
  returned: always
  type: str
  sample: "v5.6.3"

'''

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.connection import Connection
from ansible_collections.fortinet.fortios.plugins.module_utils.fortios.fortios import FortiOSHandler
from ansible_collections.fortinet.fortios.plugins.module_utils.fortios.fortios import check_legacy_fortiosapi
from ansible_collections.fortinet.fortios.plugins.module_utils.fortimanager.common import FAIL_SOCKET_MSG


def filter_firewall_ssl_setting_data(json):
    option_list = ['abbreviate_handshake', 'cert_cache_capacity', 'cert_cache_timeout',
                   'kxp_queue_threshold', 'no_matching_cipher_action', 'proxy_connect_timeout',
                   'session_cache_capacity', 'session_cache_timeout', 'ssl_dh_bits',
                   'ssl_queue_threshold', 'ssl_send_empty_frags']
    dictionary = {}

    for attribute in option_list:
        if attribute in json and json[attribute] is not None:
            dictionary[attribute] = json[attribute]

    return dictionary


def underscore_to_hyphen(data):
    if isinstance(data, list):
        for i, elem in enumerate(data):
            data[i] = underscore_to_hyphen(elem)
    elif isinstance(data, dict):
        new_data = {}
        for k, v in data.items():
            new_data[k.replace('_', '-')] = underscore_to_hyphen(v)
        data = new_data

    return data


def firewall_ssl_setting(data, fos):
    vdom = data['vdom']
    firewall_ssl_setting_data = data['firewall_ssl_setting']
    filtered_data = underscore_to_hyphen(filter_firewall_ssl_setting_data(firewall_ssl_setting_data))

    return fos.set('firewall.ssl',
                   'setting',
                   data=filtered_data,
                   vdom=vdom)


def is_successful_status(status):
    return status['status'] == "success" or \
        status['http_method'] == "DELETE" and status['http_status'] == 404


def fortios_firewall_ssl(data, fos):

    if data['firewall_ssl_setting']:
        resp = firewall_ssl_setting(data, fos)
    else:
        fos._module.fail_json(msg='missing task body: %s' % ('firewall_ssl_setting'))

    return not is_successful_status(resp), \
        resp['status'] == "success" and \
        (resp['revision_changed'] if 'revision_changed' in resp else True), \
        resp


def main():
    mkeyname = None
    fields = {
        "access_token": {"required": False, "type": "str", "no_log": True},
        "vdom": {"required": False, "type": "str", "default": "root"},
        "firewall_ssl_setting": {
            "required": False, "type": "dict", "default": None,
            "options": {
                "abbreviate_handshake": {"required": False, "type": "str",
                                         "choices": ["enable",
                                                     "disable"]},
                "cert_cache_capacity": {"required": False, "type": "int"},
                "cert_cache_timeout": {"required": False, "type": "int"},
                "kxp_queue_threshold": {"required": False, "type": "int"},
                "no_matching_cipher_action": {"required": False, "type": "str",
                                              "choices": ["bypass",
                                                          "drop"]},
                "proxy_connect_timeout": {"required": False, "type": "int"},
                "session_cache_capacity": {"required": False, "type": "int"},
                "session_cache_timeout": {"required": False, "type": "int"},
                "ssl_dh_bits": {"required": False, "type": "str",
                                "choices": ["768",
                                            "1024",
                                            "1536",
                                            "2048"]},
                "ssl_queue_threshold": {"required": False, "type": "int"},
                "ssl_send_empty_frags": {"required": False, "type": "str",
                                         "choices": ["enable",
                                                     "disable"]}

            }
        }
    }

    check_legacy_fortiosapi()
    module = AnsibleModule(argument_spec=fields,
                           supports_check_mode=False)

    versions_check_result = None
    if module._socket_path:
        connection = Connection(module._socket_path)
        if 'access_token' in module.params:
            connection.set_option('access_token', module.params['access_token'])

        fos = FortiOSHandler(connection, module, mkeyname)

        is_error, has_changed, result = fortios_firewall_ssl(module.params, fos)
        versions_check_result = connection.get_system_version()
    else:
        module.fail_json(**FAIL_SOCKET_MSG)

    if versions_check_result and versions_check_result['matched'] is False:
        module.warn("Ansible has detected version mismatch between FortOS system and galaxy, see more details by specifying option -vvv")

    if not is_error:
        if versions_check_result and versions_check_result['matched'] is False:
            module.exit_json(changed=has_changed, version_check_warning=versions_check_result, meta=result)
        else:
            module.exit_json(changed=has_changed, meta=result)
    else:
        if versions_check_result and versions_check_result['matched'] is False:
            module.fail_json(msg="Error in repo", version_check_warning=versions_check_result, meta=result)
        else:
            module.fail_json(msg="Error in repo", meta=result)


if __name__ == '__main__':
    main()
