# -*- coding: utf8 -*-
# This file is part of PyBossa.
#
# Copyright (C) 2015 SciFabric LTD.
#
# PyBossa is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# PyBossa 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with PyBossa.  If not, see <http://www.gnu.org/licenses/>.

import pybossa.vmcp as vmcp
from mock import patch
import hashlib
import M2Crypto
import base64
from default import assert_not_raises


class TestVMCP(object):

    def test_myquote(self):
        """Test myquote works."""
        # Valid char should be the same
        err_msg = "Valid chars should not be quoted"
        assert vmcp.myquote('a') == 'a', err_msg
        # Non-valid
        err_msg = "Non-Valid chars should be quoted"
        assert vmcp.myquote('%') == '%25', err_msg

    def test_calculate_buffer(self):
        """Test calculate_buffer works"""
        data = {"flags": 8,
                "name": "MyAwesomeVM",
                "ram": 512,
                "secret": "mg041na39123",
                "userData": "[amiconfig]\nplugins=cernvm\n[cernvm]\nusers=user:users;password",
                "vcpus": 1,
                "true": True,
                "false": False,
                "version": "1.5"}

        out = vmcp.calculate_buffer(data, 'salt')
        err_msg = "Salt should be appended to the string"
        assert 'salt' in out, err_msg
        err_msg = "Boolean True has to be converted to 1"
        assert "true=1" in out, err_msg
        err_msg = "Boolean False has to be converted to 0"
        assert "false=0" in out, err_msg


    def test_sign(self):
        """Test sign works."""
        rsa = M2Crypto.RSA.gen_key(2048, 65537)
        salt = 'salt'
        data = {"flags": 8,
                "name": "MyAwesomeVM",
                "ram": 512,
                "secret": "mg041na39123",
                "userData": "[amiconfig]\nplugins=cernvm\n[cernvm]\nusers=user:users;password",
                "vcpus": 1,
                "version": "1.5"}
        strBuffer = vmcp.calculate_buffer(data, salt)
        digest = hashlib.new('sha512', strBuffer).digest()

        with patch('M2Crypto.RSA.load_key', return_value=rsa):
            out = vmcp.sign(data, salt, 'key')
            err_msg = "There should be a key named signature"
            assert out.get('signature'), err_msg

            err_msg = "The signature should not be empty"
            assert out['signature'] is not None, err_msg
            assert out['signature'] != '', err_msg

            err_msg = "The signature should be the same"
            signature = base64.b64decode(out['signature'])
            assert rsa.verify(digest, signature, 'sha512') == 1, err_msg

            # The output must be convertible into json object
            import json
            assert_not_raises(Exception, json.dumps, out)