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# -*- coding: utf-8 -*-
# shared_db.py
# Copyright (C) 2013 LEAP
#
# 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/>.
"""
A shared database for storing/retrieving encrypted key material.
"""
import simplejson as json
from u1db.remote import http_database
from leap.soledad.client.auth import TokenBasedAuth
#-----------------------------------------------------------------------------
# Soledad shared database
#-----------------------------------------------------------------------------
class NoTokenForAuth(Exception):
"""
No token was found for token-based authentication.
"""
class Unauthorized(Exception):
"""
User does not have authorization to perform task.
"""
class SoledadSharedDatabase(http_database.HTTPDatabase, TokenBasedAuth):
"""
This is a shared recovery database that enables users to store their
encryption secrets in the server and retrieve them afterwards.
"""
# TODO: prevent client from messing with the shared DB.
# TODO: define and document API.
#
# Token auth methods.
#
def set_token_credentials(self, uuid, token):
"""
Store given credentials so we can sign the request later.
@param uuid: The user's uuid.
@type uuid: str
@param token: The authentication token.
@type token: str
"""
TokenBasedAuth.set_token_credentials(self, uuid, token)
def _sign_request(self, method, url_query, params):
"""
Return an authorization header to be included in the HTTP request.
@param method: The HTTP method.
@type method: str
@param url_query: The URL query string.
@type url_query: str
@param params: A list with encoded query parameters.
@type param: list
@return: The Authorization header.
@rtype: list of tuple
"""
return TokenBasedAuth._sign_request(self, method, url_query, params)
#
# Modified HTTPDatabase methods.
#
@staticmethod
def open_database(url, create, creds=None):
# TODO: users should not be able to create the shared database, so we
# have to remove this from here in the future.
"""
Open a Soledad shared database.
@param url: URL of the remote database.
@type url: str
@param create: Should the database be created if it does not already
exist?
@type create: bool
@param token: An authentication token for accessing the shared db.
@type token: str
@return: The shared database in the given url.
@rtype: SoledadSharedDatabase
"""
db = SoledadSharedDatabase(url, creds=creds)
db.open(create)
return db
@staticmethod
def delete_database(url):
"""
Dummy method that prevents from deleting shared database.
@raise: This will always raise an Unauthorized exception.
@param url: The database URL.
@type url: str
"""
raise Unauthorized("Can't delete shared database.")
def __init__(self, url, document_factory=None, creds=None):
"""
Initialize database with auth token and encryption powers.
@param url: URL of the remote database.
@type url: str
@param document_factory: A factory for U1BD documents.
@type document_factory: u1db.Document
@param creds: A tuple containing the authentication method and
credentials.
@type creds: tuple
"""
http_database.HTTPDatabase.__init__(self, url, document_factory,
creds)
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