# -*- coding: utf-8 -*-

# 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 <http://www.gnu.org/licenses/>.

"""

kallithea.lib.auth_modules.auth_crowd

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Kallithea authentication plugin for Atlassian CROWD

This file was forked by the Kallithea project in July 2014.

Original author and date, and relevant copyright and licensing information is below:

:created_on: Created on Nov 17, 2012

:author: marcink

:copyright: (c) 2013 RhodeCode GmbH, and others.

:license: GPLv3, see LICENSE.md for more details.

"""

import base64

import logging

import urllib2

from kallithea.lib import auth_modules, ext_json

from kallithea.lib.utils2 import ascii_bytes, ascii_str, safe_bytes

log = logging.getLogger(__name__)

class CrowdServer(object):

    def __init__(self, *args, **kwargs):

        """

        Create a new CrowdServer object that points to IP/Address 'host',

        on the given port, and using the given method (https/http). user and

        passwd can be set here or with set_credentials. If unspecified,

        "version" defaults to "latest".

        example::

            cserver = CrowdServer(host="127.0.0.1",

                                  port="8095",

                                  user="some_app",

                                  passwd="some_passwd",

                                  version="1")

        """

        if "port" not in kwargs:

            kwargs["port"] = "8095"

        self._logger = kwargs.get("logger", logging.getLogger(__name__))

        self._uri = "%s://%s:%s/crowd" % (kwargs.get("method", "http"),

                                    kwargs.get("host", "127.0.0.1"),

                                    kwargs.get("port", "8095"))

        self.set_credentials(kwargs.get("user", ""),

                             kwargs.get("passwd", ""))

        self._version = kwargs.get("version", "latest")

        self._url_list = None

        self._appname = "crowd"

    def set_credentials(self, user, passwd):

        self.user = user

        self.passwd = passwd

        self._make_opener()

    def _make_opener(self):

        mgr = urllib2.HTTPPasswordMgrWithDefaultRealm()

        mgr.add_password(None, self._uri, self.user, self.passwd)

        handler = urllib2.HTTPBasicAuthHandler(mgr)

        self.opener = urllib2.build_opener(handler)

    def _request(self, url, body=None, headers=None,

                 method=None, noformat=False,

                 empty_response_ok=False):

        _headers = {"Content-type": "application/json",

                    "Accept": "application/json"}

        if self.user and self.passwd:

            authstring = ascii_str(base64.b64encode(safe_bytes("%s:%s" % (self.user, self.passwd))))

            _headers["Authorization"] = "Basic %s" % authstring

        if headers:

            _headers.update(headers)

        req = urllib2.Request(url, body, _headers)

        if method:

            req.get_method = lambda: method

        global msg

        msg = ""

        try:

            rdoc = self.opener.open(req)

            msg = "".join(rdoc.readlines())

            if not msg and empty_response_ok:

                rval = {}

                rval["status"] = True

                rval["error"] = "Response body was empty"

            elif not noformat:

                rval = ext_json.loads(msg)

                rval["status"] = True

            else:

                rval = "".join(rdoc.readlines())

        except Exception as e:

            if not noformat:

                rval = {"status": False,

                        "body": body,

                        "error": str(e) + "\n" + msg}

            else:

                rval = None

        return rval

    def user_auth(self, username, password):

        """Authenticate a user against crowd. Returns brief information about

        the user."""

        url = ("%s/rest/usermanagement/%s/authentication?username=%s"

               % (self._uri, self._version, urllib2.quote(username)))

        body = ascii_bytes(ext_json.dumps({"value": password}))

        return self._request(url, body)

    def user_groups(self, username):

        """Retrieve a list of groups to which this user belongs."""

        url = ("%s/rest/usermanagement/%s/user/group/nested?username=%s"

               % (self._uri, self._version, urllib2.quote(username)))

        return self._request(url)

class KallitheaAuthPlugin(auth_modules.KallitheaExternalAuthPlugin):

    def __init__(self):

        self._protocol_values = ["http", "https"]

    @hybrid_property

    def name(self):

                "description": "The Port in use by the Atlassian CROWD Server",

                "default": 8095,

                "formname": "Port"

            },

            {

                "name": "app_name",

                "validator": self.validators.UnicodeString(strip=True),

                "type": "string",

                "description": "The Application Name to authenticate to CROWD",

                "default": "",

                "formname": "Application Name"

            },

            {

                "name": "app_password",

                "validator": self.validators.UnicodeString(strip=True),

                "type": "string",

                "description": "The password to authenticate to CROWD",

                "default": "",

                "formname": "Application Password"

            },

            {

                "name": "admin_groups",

                "validator": self.validators.UnicodeString(strip=True),

                "type": "string",

                "description": "A comma separated list of group names that identify users as Kallithea Administrators",

                "formname": "Admin Groups"

            }

        ]

        return settings

    def use_fake_password(self):

        return True

    def auth(self, userobj, username, password, settings, **kwargs):

        """

        Given a user object (which may be null), username, a plaintext password,

        and a settings object (containing all the keys needed as listed in settings()),

        authenticate this user's login attempt.

        Return None on failure. On success, return a dictionary of the form:

            see: KallitheaAuthPluginBase.auth_func_attrs

        This is later validated for correctness

        """

        if not username or not password:

            log.debug('Empty username or password skipping...')

            return None

        server = CrowdServer(**settings)

        server.set_credentials(settings["app_name"], settings["app_password"])

        crowd_user = server.user_auth(username, password)

        if not crowd_user["status"]:

            log.error('Crowd authentication as %s returned no status', username)

            return None

        if not crowd_user.get('active'):

            log.error('Crowd authentication as %s returned in-active user', username)

            return None

        res = server.user_groups(crowd_user["name"])

        crowd_user["groups"] = [x["name"] for x in res["groups"]]

        # old attrs fetched from Kallithea database

        admin = getattr(userobj, 'admin', False)

        email = getattr(userobj, 'email', '')

        firstname = getattr(userobj, 'firstname', '')

        lastname = getattr(userobj, 'lastname', '')

        user_data = {

            'username': crowd_user["name"] or username,

            'firstname': crowd_user["first-name"] or firstname,

            'lastname': crowd_user["last-name"] or lastname,

            'groups': crowd_user["groups"],

            'email': crowd_user["email"] or email,

            'admin': admin,

            'extern_name': crowd_user["name"],

        }

        # set an admin if we're in admin_groups of crowd

        for group in settings["admin_groups"].split(","):

            if group in user_data["groups"]:

                user_data["admin"] = True

        log.info('user %s authenticated correctly', user_data['username'])

        return user_data

    def get_managed_fields(self):

        return ['username', 'firstname', 'lastname', 'email', 'password']