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

# Copyright (C) 2010-2020 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# 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 Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/

import pytest

from rhodecode.lib.encrypt import (
    AESCipher, InvalidDecryptedValue)
from rhodecode.lib import enc_utils
from rhodecode.lib.str_utils import safe_str
from rhodecode.lib.exceptions import SignatureVerificationError


@pytest.mark.parametrize(
    "algo", ['fernet', 'aes'],
)
@pytest.mark.parametrize(
    "key, text",
    [
        (b'a', 'short'),
        (b'a' * 64, 'too long(trimmed to 32)'),
        (b'a' * 32, 'just enough'),
        ('ąćęćę', 'non asci'),
        ('$asa$asa', 'special $ used'),
    ]
)
@pytest.mark.parametrize(
    "strict_mode", [True, False],
)
def test_common_encryption_module(algo, key, text, strict_mode):
    encrypted = enc_utils.encrypt_value(text, algo=algo, enc_key=key)
    decrypted = enc_utils.decrypt_value(encrypted, algo=algo, enc_key=key, strict_mode=strict_mode)
    assert text == safe_str(decrypted)


@pytest.mark.parametrize(
    "algo", ['fernet', 'aes'],
)
def test_encryption_with_bad_key(algo):
    key = b'secretstring'
    text = b'ihatemysql'

    encrypted = enc_utils.encrypt_value(text, algo=algo, enc_key=key)
    decrypted = enc_utils.decrypt_value(encrypted, algo=algo, enc_key=b'different-key', strict_mode=False)

    assert decrypted[:22] == '<InvalidDecryptedValue'


@pytest.mark.parametrize(
    "algo", ['fernet', 'aes'],
)
def test_encryption_with_bad_key_raises(algo):
    key = b'secretstring'
    text = b'ihatemysql'
    encrypted = enc_utils.encrypt_value(text, algo=algo, enc_key=key)

    with pytest.raises(SignatureVerificationError) as e:
        enc_utils.decrypt_value(encrypted, algo=algo, enc_key=b'different-key', strict_mode=True)

    assert 'InvalidDecryptedValue' in str(e)


@pytest.mark.parametrize(
    "algo", ['fernet', 'aes'],
)
def test_encryption_with_bad_format_data(algo):
    key = b'secret'
    text = b'ihatemysql'
    encrypted = enc_utils.encrypt_value(text, algo=algo, enc_key=key)
    encrypted = b'$xyz' + encrypted[3:]

    with pytest.raises(ValueError) as e:
        enc_utils.decrypt_value(encrypted, algo=algo, enc_key=key, strict_mode=True)

    assert 'Encrypted Data has invalid format' in str(e)


@pytest.mark.parametrize(
    "algo", ['fernet', 'aes'],
)
def test_encryption_with_bad_data(algo):
    key = b'secret'
    text = b'ihatemysql'
    encrypted = enc_utils.encrypt_value(text, algo=algo, enc_key=key)
    encrypted = encrypted[:-5]

    with pytest.raises(SignatureVerificationError) as e:
        enc_utils.decrypt_value(encrypted, algo=algo, enc_key=key, strict_mode=True)

    assert 'SignatureVerificationError' in str(e)


def test_encryption_with_hmac():
    key = b'secret'
    text = b'ihatemysql'
    enc = AESCipher(key, hmac=True).encrypt(text)
    assert AESCipher(key, hmac=True).decrypt(enc) == text


def test_encryption_with_hmac_with_bad_data():
    key = b'secret'
    text = b'ihatemysql'
    enc = AESCipher(key, hmac=True).encrypt(text)
    enc = b'xyz' + enc[3:]
    with pytest.raises(SignatureVerificationError) as e:
        assert AESCipher(key, hmac=True).decrypt(enc, safe=False) == text

    assert 'SignatureVerificationError' in str(e)


def test_encryption_with_hmac_with_bad_key_not_strict():
    key = b'secretstring'
    text = b'ihatemysql'
    enc = AESCipher(key, hmac=True).encrypt(text)

    decrypted = AESCipher(
        b'differentsecret', hmac=True, strict_verification=False
    ).decrypt(enc)

    assert isinstance(decrypted, InvalidDecryptedValue)