# (c) 2014, James Tanner <tanner.jc@gmail.com>
# (c) 2014, James Cammarata, <jcammarata@ansible.com>
#
# This file is part of Ansible
#
# Ansible 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.
#
# Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.

# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import sys
import os
import tempfile
from nose.plugins.skip import SkipTest

from ansible.compat.tests import unittest
from ansible.compat.tests.mock import patch
from ansible.utils.unicode import to_bytes, to_unicode

from ansible import errors
from ansible.parsing.vault import VaultLib
from ansible.parsing.vault import VaultEditor

# Counter import fails for 2.0.1, requires >= 2.6.1 from pip
try:
    from Crypto.Util import Counter
    HAS_COUNTER = True
except ImportError:
    HAS_COUNTER = False

# KDF import fails for 2.0.1, requires >= 2.6.1 from pip
try:
    from Crypto.Protocol.KDF import PBKDF2
    HAS_PBKDF2 = True
except ImportError:
    HAS_PBKDF2 = False

# AES IMPORTS
try:
    from Crypto.Cipher import AES as AES
    HAS_AES = True
except ImportError:
    HAS_AES = False

v10_data = """$ANSIBLE_VAULT;1.0;AES
53616c7465645f5fd0026926a2d415a28a2622116273fbc90e377225c12a347e1daf4456d36a77f9
9ad98d59f61d06a4b66718d855f16fb7bdfe54d1ec8aeaa4d06c2dc1fa630ae1846a029877f0eeb1
83c62ffb04c2512995e815de4b4d29ed"""

v11_data = """$ANSIBLE_VAULT;1.1;AES256
62303130653266653331306264616235333735323636616539316433666463323964623162386137
3961616263373033353631316333623566303532663065310a393036623466376263393961326530
64336561613965383835646464623865663966323464653236343638373165343863623638316664
3631633031323837340a396530313963373030343933616133393566366137363761373930663833
3739"""

class TestVaultEditor(unittest.TestCase):

    def setUp(self):
        pass

    def tearDown(self):
        pass

    def test_methods_exist(self):
        v = VaultEditor(None)
        slots = ['create_file',
                 'decrypt_file',
                 'edit_file',
                 'encrypt_file',
                 'rekey_file',
                 'read_data',
                 'write_data',
                 'shuffle_files']
        for slot in slots:
            assert hasattr(v, slot), "VaultLib is missing the %s method" % slot

    @patch.object(VaultEditor, '_editor_shell_command')
    def test_create_file(self, mock_editor_shell_command):

        def sc_side_effect(filename):
            return ['touch', filename]
        mock_editor_shell_command.side_effect = sc_side_effect

        tmp_file = tempfile.NamedTemporaryFile()
        os.unlink(tmp_file.name)

        ve = VaultEditor("ansible")
        ve.create_file(tmp_file.name)

        self.assertTrue(os.path.exists(tmp_file.name))

    @unittest.skipIf(sys.version_info[0] >= 3, "VaultAES still needs to be ported to Python 3")
    def test_decrypt_1_0(self):
        """
        Skip testing decrypting 1.0 files if we don't have access to AES, KDF or
        Counter, or we are running on python3 since VaultAES hasn't been backported.
        """
        if not HAS_AES or not HAS_COUNTER or not HAS_PBKDF2:
            raise SkipTest

        v10_file = tempfile.NamedTemporaryFile(delete=False)
        with v10_file as f:
            f.write(to_bytes(v10_data))

        ve = VaultEditor("ansible")

        # make sure the password functions for the cipher
        error_hit = False
        try:
            ve.decrypt_file(v10_file.name)
        except errors.AnsibleError as e:
            error_hit = True

        # verify decrypted content
        f = open(v10_file.name, "rb")
        fdata = to_unicode(f.read())
        f.close()

        os.unlink(v10_file.name)

        assert error_hit == False, "error decrypting 1.0 file"
        assert fdata.strip() == "foo", "incorrect decryption of 1.0 file: %s" % fdata.strip()


    def test_decrypt_1_1(self):
        if not HAS_AES or not HAS_COUNTER or not HAS_PBKDF2:
            raise SkipTest

        v11_file = tempfile.NamedTemporaryFile(delete=False)
        with v11_file as f:
            f.write(to_bytes(v11_data))

        ve = VaultEditor("ansible")

        # make sure the password functions for the cipher
        error_hit = False
        try:
            ve.decrypt_file(v11_file.name)
        except errors.AnsibleError as e:
            error_hit = True

        # verify decrypted content
        f = open(v11_file.name, "rb")
        fdata = to_unicode(f.read())
        f.close()

        os.unlink(v11_file.name)

        assert error_hit == False, "error decrypting 1.0 file"
        assert fdata.strip() == "foo", "incorrect decryption of 1.0 file: %s" % fdata.strip()


    @unittest.skipIf(sys.version_info[0] >= 3, "VaultAES still needs to be ported to Python 3")
    def test_rekey_migration(self):
        """
        Skip testing rekeying files if we don't have access to AES, KDF or
        Counter, or we are running on python3 since VaultAES hasn't been backported.
        """
        if not HAS_AES or not HAS_COUNTER or not HAS_PBKDF2:
            raise SkipTest

        v10_file = tempfile.NamedTemporaryFile(delete=False)
        with v10_file as f:
            f.write(to_bytes(v10_data))

        ve = VaultEditor("ansible")

        # make sure the password functions for the cipher
        error_hit = False
        try:
            ve.rekey_file(v10_file.name, 'ansible2')
        except errors.AnsibleError as e:
            error_hit = True

        # verify decrypted content
        f = open(v10_file.name, "rb")
        fdata = f.read()
        f.close()

        assert error_hit == False, "error rekeying 1.0 file to 1.1"

        # ensure filedata can be decrypted, is 1.1 and is AES256
        vl = VaultLib("ansible2")
        dec_data = None
        error_hit = False
        try:
            dec_data = vl.decrypt(fdata)
        except errors.AnsibleError as e:
            error_hit = True

        os.unlink(v10_file.name)

        assert vl.cipher_name == "AES256", "wrong cipher name set after rekey: %s" % vl.cipher_name
        assert error_hit == False, "error decrypting migrated 1.0 file"
        assert dec_data.strip() == "foo", "incorrect decryption of rekeyed/migrated file: %s" % dec_data