#!/usr/bin/env python

# Copyright (C) 2017 g10 Code GmbH

#

# This file is part of GPGME.

#

# GPGME 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 2 of the License, or

# (at your option) any later version.

#

# GPGME 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 Lesser General

# Public License for more details.

#

# You should have received a copy of the GNU Lesser General Public

# License along with this program; if not, see <http://www.gnu.org/licenses/>.

from __future__ import absolute_import, print_function, unicode_literals

del absolute_import, print_function, unicode_literals

import gpg

import itertools

import time

import support

alpha = "Alpha <alpha@invalid.example.net>"

bravo = "Bravo <bravo@invalid.example.net>"

with support.EphemeralContext() as ctx:

    res = ctx.create_key(alpha, certify=True)

    keys = list(ctx.keylist())

    assert len(keys) == 1, "Weird number of keys created"

    key = keys[0]

    assert key.fpr == res.fpr

    assert len(key.subkeys) == 1, "Expected one primary key and no subkeys"

    def get_subkey(fpr):

        k = ctx.get_key(fpr)

        for sk in k.subkeys:

            if sk.fpr == fpr:

                return sk

        return None

    # Check gpg.constants.create.NOEXPIRE...

    res = ctx.create_subkey(key, expires=False)

    subkey = get_subkey(res.fpr)

    assert subkey.expires == 0, "Expected subkey not to expire"

    assert subkey.can_encrypt, \

        "Default subkey capabilities do not include encryption"

    t = 2 * 24 * 60 * 60

    slack = 5 * 60

    res = ctx.create_subkey(key, expires_in=t)

    subkey = get_subkey(res.fpr)

    assert abs(time.time() + t - subkey.expires) < slack, \

        "subkeys expiration time is off"

    # Check capabilities

    for sign, encrypt, authenticate in itertools.product([False, True],

                                                         [False, True],

                                                         [False, True]):

        # Filter some out

        if not (sign or encrypt or authenticate):

            # This triggers the default capabilities tested before.

            continue

        res = ctx.create_subkey(key, sign=sign, encrypt=encrypt,

                                authenticate=authenticate)

        subkey = get_subkey(res.fpr)

        assert sign == subkey.can_sign

        assert encrypt == subkey.can_encrypt

        assert authenticate == subkey.can_authenticate

    # Check algorithm

    res = ctx.create_subkey(key, algorithm="rsa")

    subkey = get_subkey(res.fpr)

    assert subkey.pubkey_algo == 1

    # Check algorithm with size

    res = ctx.create_subkey(key, algorithm="rsa1024")

    subkey = get_subkey(res.fpr)

    assert subkey.pubkey_algo == 1

    assert subkey.length == 1024

    # Check algorithm future-default

    ctx.create_subkey(key, algorithm="future-default")

    # Check passphrase protection.  For this we create a new key

    # so that we have a key with just one encryption subkey.

    bravo_res = ctx.create_key(bravo, certify=True)

    bravo_key = ctx.get_key(bravo_res.fpr)

    assert len(bravo_key.subkeys) == 1, "Expected one primary key and no subkeys"

    passphrase = "streng geheim"

    res = ctx.create_subkey(bravo_key, passphrase=passphrase)

    ciphertext, _, _ = ctx.encrypt(b"hello there",

                                   recipients=[ctx.get_key(bravo_res.fpr)])

    cb_called = False

    def cb(*args):

        global cb_called

        cb_called = True

        return passphrase

    ctx.pinentry_mode = gpg.constants.PINENTRY_MODE_LOOPBACK

    ctx.set_passphrase_cb(cb)

    plaintext, _, _ = ctx.decrypt(ciphertext)

    assert plaintext == b"hello there"

    assert cb_called