#!/usr/bin/env python
DOCUMENTATION = """
module: htpasswd
short_description: manage user files for basic authentication
description:
  - Add and remove username/password entries in a password file using htpasswd.
  - This is used by web servers such as Apache and Nginx for basic authentication.
options:
  path:
    required: true
    aliases: [ dest, destfile ]
    description:
      - Path to the file that contains the usernames and passwords
  name:
    required: true
    aliases: [ username ]
    description:
      - User name to add or remove
  password:
    required: false
    description:
      - Password associated with user.
      - Must be specified if user does not exist yet
  state:
    required: false
    choices: [ present, absent ]
    default: "present"
    description:
      - Whether the user entry should be present or not
  create:
    required: false
    choices: [ "yes", "no" ]
    default: "yes"
    description:
      - Used with C(state=present). If specified, the file will be created
        if it does not already exist. If set to "no", will fail if the
        file does not exist
requires: [ passlib>=1.6 ]
author: Lorin Hochstein
"""

EXAMPLES = """
# Add a user to a password file and ensure permissions are set
- htpasswd: path=/etc/nginx/passwdfile name=janedoe password=9s36?;fyNp owner=root group=www-data mode=0640
# Remove a user from a password file
- htpasswd: path=/etc/apache2/passwdfile name=foobar state=absent
"""


import os

try:
    from passlib.apache import HtpasswdFile
except ImportError:
    passlib_installed = False
else:
    passlib_installed = True


def create_missing_directories(dest):
    destpath = os.path.dirname(dest)
    if not os.path.exists(destpath):
        os.makedirs(destpath)


def present(dest, username, password, create, check_mode):
    """ Ensures user is present

    Returns (msg, changed) """
    if not os.path.exists(dest):
        if not create:
            raise ValueError('Destination %s does not exist' % dest)
        if check_mode:
            return ("Create %s" % dest, True)
        create_missing_directories(dest)
        ht = HtpasswdFile(dest, new=True)
        ht.set_password(username, password)
        ht.save()
        return ("Created %s and added %s" % (dest, username), True)
    else:
        ht = HtpasswdFile(dest, new=False)
        if ht.check_password(username, password):
            return ("%s already present" % username, False)
        else:
            if not check_mode:
                ht.set_password(username, password)
                ht.save()
            return ("Add/update %s" % username, True)


def absent(dest, username, check_mode):
    """ Ensures user is absent

    Returns (msg, changed) """
    if not os.path.exists(dest):
        raise ValueError("%s does not exists" % dest)

    ht = HtpasswdFile(dest, new=False)
    if username not in ht.users():
        return ("%s not present" % username, False)
    else:
        if not check_mode:
            ht.delete(username)
            ht.save()
        return ("Remove %s" % username, True)


def check_file_attrs(module, changed, message):

    file_args = module.load_file_common_arguments(module.params)
    if module.set_file_attributes_if_different(file_args, False):

        if changed:
            message += " and "
        changed = True
        message += "ownership, perms or SE linux context changed"

    return message, changed


def main():
    arg_spec = dict(
        path=dict(required=True, aliases=["dest", "destfile"]),
        name=dict(required=True, aliases=["username"]),
        password=dict(required=False, default=None),
        state=dict(required=False, default="present"),
        create=dict(type='bool', choices=BOOLEANS, default='yes'),

    )
    module = AnsibleModule(argument_spec=arg_spec,
                           add_file_common_args=True,
                           supports_check_mode=True)

    path = module.params['path']
    username = module.params['name']
    password = module.params['password']
    state = module.params['state']
    create = module.params['create']
    check_mode = module.check_mode

    if not passlib_installed:
        module.fail_json(msg="This module requires the passlib Python library")

    try:
        if state == 'present':
            (msg, changed) = present(path, username, password, create, check_mode)
        elif state == 'absent':
            (msg, changed) = absent(path, username, check_mode)
        else:
            module.fail_json(msg="Invalid state: %s" % state)

        check_file_attrs(module, changed, msg)
        module.exit_json(msg=msg, changed=changed)
    except Exception, e:
        module.fail_json(msg=str(e))


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

if __name__ == '__main__':
    main()