File: client.py

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##
#   Copyright (C) 2013 Jessica T. (Tsyesika) <xray7224@googlemail.com>
#
#   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/>.
##

from __future__ import absolute_import

import json
import logging

import requests

from pypump.exceptions import ClientException

_log = logging.getLogger(__name__)


class Client(object):
    """This represents a client/application which is using the Pump API.

    :param webfinger: webfinger id of this user, ie "mary@example.org"
      This is probably your username @ the domain of the pump instance
      you're using.
    :param type: whether this is a "web" or "native" client.  Unless you're
      using pypump as part of a web service, you should choose "native".
    :param name: The name of this client, ie your application's name.  For
      example, if you were using PyPump to write CoolCommunicator, you
      would put "CoolCommunicator" here.
    :param contacts: Who wrote this application?  List of email addresses
      of those who authored this client.
    :param redirect: a list of URIs as callbacks for the authorization
      server
    :param logo: URI of your application's logo.

    Additionally, the following init args should only be supplied if
    you've already registered this client with the server.  If not,
    these will be filled in during the `self.register()` step.

    :param key: If This is the token (the `client_id`) we got back that
      identifies our client, assuming we've already registered our
      client.
    :param secret: This is your secret token that authorizes you to connect
      to the pump instance (the `client_secret`).
    :param expirey: When our token expires (`espires_at`)

    Note that the above three are not the same as the oauth
    permissions verifying the user has access to post, this is related
    to permissions and identification of the client software to post.
    For the premission related to the access of the account, see
    PyPump.key and PyPump.secret.
    """

    ENDPOINT = "api/client/register"

    def __init__(self, webfinger, type, name=None, contacts=None, redirect=None,
                 logo=None, key=None, secret=None, expirey=None):

        self.webfinger = webfinger
        self.name = name
        self.type = type
        self.logo = logo
        self.contacts = contacts or []
        self.redirect = redirect or []

        self.key = key
        self.secret = secret
        self.expirey = expirey

        self._pump = None

    @property
    def server(self):
        return self.webfinger.split("@", 1)[1]

    @property
    def nickname(self):
        return self.webfinger.split("@", 1)[0]

    def set_pump(self, pump):
        self._pump = pump

    @property
    def context(self):
        """ Provides request context """
        type = "client_associate" if self.key is None else "client_update"
        data = {
            "type": type,
            "application_type": self.type,
        }

        # is this an update?
        if self.key:
            data["client_id"] = self.key
            data["client_secret"] = self.secret

        # Add optional params
        if self.name:
            data["application_name"] = self.name

        if self.logo:
            data["logo_url"] = self.logo

        if self.contacts:
            # space seporated list
            data["contacts"] = " ".join(self.contacts)

        if self.redirect:
            data["redirect_uri"] = " ".join(self.redirect)

        # Convert to JSON  and send
        return json.dumps(data)

    def request(self, server=None):
        """ Sends the request """
        request = {
            "headers": {"Content-Type": "application/json"},
            "timeout": self._pump.timeout,
            "data": self.context,
        }

        url = "{proto}://{server}/{endpoint}".format(
            proto=self._pump.protocol,
            server=server or self.server,
            endpoint=self.ENDPOINT,
        )

        response = self._pump._requester(requests.post, url, **request)

        try:
            server_data = response.json()
        except ValueError:
            raise ClientException(response.content)

        if "error" in server_data:
            raise ClientException(server_data["error"], self.context)

        _log.debug("Client registration recieved: %(id)s %(secret)s %(expire)s", {
            "id": server_data["client_id"],
            "secret": server_data["client_secret"],
            "expire": server_data["expires_at"],
        })

        return server_data

    def register(self, server=None):
        """ Registers the client with the Pump API retrieving the id and secret """
        if (self.key or self.secret):
            return self.update()

        server_data = self.request(server)

        self.key = server_data["client_id"]
        self.secret = server_data["client_secret"]
        self.expirey = server_data["expires_at"]

    def update(self):
        """ Updates the information the Pump server has about the client """
        error = ""

        if self.key is None:
            error = "To update a client you need to provide a key"
        if self.secret is None:
            error = "To update a client you need to provide the secret"

        if error:
            raise ClientException(error)

        self.request()
        return True

    def __repr__(self):
        if self.key:
            return "<Client {0} ({1})>".format(self.server, self.key)
        return "<Client {0}>".format(self.server)

    def __str__(self):
        return repr(self)