#!/usr/bin/python

# (c) 2012, Elliott Foster <elliott@fourkitchens.com>
# Sponsored by Four Kitchens http://fourkitchens.com.
#
# This file is part of Ansible
#
# Ansible 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.
#
# Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.

DOCUMENTATION = '''
---
module: mongodb_user
short_description: Adds or removes a user from a MongoDB database.
description:
    - Adds or removes a user from a MongoDB database.
version_added: "1.1"
options:
    login_user:
        description:
            - The username used to authenticate with
        required: false
        default: null
    login_password:
        description:
            - The password used to authenticate with
        required: false
        default: null
    login_host:
        description:
            - The host running the database
        required: false
        default: localhost
    login_port:
        description:
            - The port to connect to
        required: false
        default: 27017
    database:
        description:
            - The name of the database to add/remove the user from
        required: true
    user:
        description:
            - The name of the user to add or remove
        required: true
        default: null
    password:
        description:
            - The password to use for the user
        required: false
        default: null
    state:
        state:
        description:
            - The database user state
        required: false
        default: present
        choices: [ "present", "absent" ]
notes:
    - Requires the pymongo Python package on the remote host, version 2.4.2+. This
      can be installed using pip or the OS package manager. @see http://api.mongodb.org/python/current/installation.html
requirements: [ "pymongo" ]
author: Elliott Foster
'''

EXAMPLES = '''
# Create 'burgers' database user with name 'bob' and password '12345'.
- mongodb_user: database=burgers name=bob password=12345 state=present

# Delete 'burgers' database user with name 'bob'.
- mongodb_user: database=burgers name=bob state=absent
'''

import ConfigParser
try:
    from pymongo.errors import ConnectionFailure
    from pymongo.errors import OperationFailure
    from pymongo import MongoClient
except ImportError:
    try:  # for older PyMongo 2.2
        from pymongo import Connection as MongoClient
    except ImportError:
        pymongo_found = False
    else:
        pymongo_found = True
else:
    pymongo_found = True

# =========================================
# MongoDB module specific support methods.
#

def user_add(client, db_name, user, password):
    try:
        db = client[db_name]
        db.add_user(user, password)
    except OperationFailure:
        return False


    return True

def user_remove(client, db_name, user):
    try:
        db = client[db_name]
        db.remove_user(user)
    except OperationFailure:
        return False

    return True

def load_mongocnf():
    config = ConfigParser.RawConfigParser()
    mongocnf = os.path.expanduser('~/.mongodb.cnf')
    if not os.path.exists(mongocnf):
        return False

    try:
        config.readfp(open(mongocnf))
        creds = dict(
          user=config.get('client', 'user'),
          password=config.get('client', 'pass')
        )
    except (ConfigParser.NoOptionError, IOError):
        return False

    return creds

# =========================================
# Module execution.
#

def main():
    module = AnsibleModule(
        argument_spec = dict(
            login_user=dict(default=None),
            login_password=dict(default=None),
            login_host=dict(default='localhost'),
            login_port=dict(default='27017'),
            database=dict(required=True, aliases=['db']),
            user=dict(required=True, aliases=['name']),
            password=dict(aliases=['pass']),
            state=dict(default='present', choices=['absent', 'present']),
        )
    )

    if not pymongo_found:
        module.fail_json(msg='the python pymongo module is required')

    login_user = module.params['login_user']
    login_password = module.params['login_password']
    login_host = module.params['login_host']
    login_port = module.params['login_port']
    db_name = module.params['database']
    user = module.params['user']
    password = module.params['password']
    state = module.params['state']

    try:
        client = MongoClient(login_host, int(login_port))
        if login_user is None and login_password is None:
            mongocnf_creds = load_mongocnf()
            if mongocnf_creds is not False:
                login_user = mongocnf_creds['user']
                login_password = mongocnf_creds['password']
        elif login_password is None and login_user is not None:
            module.fail_json(msg='when supplying login arguments, both login_user and login_password must be provided')

        if login_user is not None and login_password is not None:
            client.admin.authenticate(login_user, login_password)

    except ConnectionFailure as e:
        module.fail_json(msg='unable to connect to database, check login_user and login_password are correct')

    if state == 'present':
        if password is None:
            module.fail_json(msg='password parameter required when adding a user')
        if user_add(client, db_name, user, password) is not True:
            module.fail_json(msg='Unable to add or update user, check login_user and login_password are correct and that this user has access to the admin collection')
    elif state == 'absent':
        if user_remove(client, db_name, user) is not True:
            module.fail_json(msg='Unable to remove user, check login_user and login_password are correct and that this user has access to the admin collection')

    module.exit_json(changed=True, user=user)

# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()