import os
import shutil
import tempfile
from leap.email.smtp.smtprelay import GPGWrapper
from twisted.trial import unittest
from leap.testing.basetest import BaseLeapTest


class OpenPGPTestCase(unittest.TestCase, BaseLeapTest):

    def setUp(self):
        # mimic LeapBaseTest.setUpClass behaviour, because this is deprecated
        # in Twisted: http://twistedmatrix.com/trac/ticket/1870
        self.old_path = os.environ['PATH']
        self.old_home = os.environ['HOME']
        self.tempdir = tempfile.mkdtemp(prefix="leap_tests-")
        self.home = self.tempdir
        bin_tdir = os.path.join(
            self.tempdir,
            'bin')
        os.environ["PATH"] = bin_tdir
        os.environ["HOME"] = self.tempdir
        # setup our own stuff
        self.gnupg_home = self.tempdir + '/gnupg'
        os.mkdir(self.gnupg_home)
        self.email = 'leap@leap.se'
        self._gpg = GPGWrapper(gpghome=self.gnupg_home)

        self.assertEqual(self._gpg.import_keys(PUBLIC_KEY).summary(),
                         '1 imported', "error importing public key")
        self.assertEqual(self._gpg.import_keys(PRIVATE_KEY).summary(),
                         # note that gnupg does not return a successful import
                         # for private keys. Bug?
                         '0 imported', "error importing private key")

    def tearDown(self):
        # mimic LeapBaseTest.tearDownClass behaviour
        os.environ["PATH"] = self.old_path
        os.environ["HOME"] = self.old_home
        # safety check
        assert self.tempdir.startswith('/tmp/leap_tests-')
        shutil.rmtree(self.tempdir)

    def test_openpgp_encrypt_decrypt(self):
        text = "simple raw text"
        encrypted = str(self._gpg.encrypt(text, KEY_FINGERPRINT,
                                          # TODO: handle always trust issue
                                          always_trust=True))
        self.assertNotEqual(text, encrypted, "failed encrypting text")
        decrypted = str(self._gpg.decrypt(encrypted))
        self.assertEqual(text, decrypted, "failed decrypting text")


# Key material for testing
KEY_FINGERPRINT = "E36E738D69173C13D709E44F2F455E2824D18DDF"
PUBLIC_KEY = """
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.10 (GNU/Linux)

mQINBFC9+dkBEADNRfwV23TWEoGc/x0wWH1P7PlXt8MnC2Z1kKaKKmfnglVrpOiz
iLWoiU58sfZ0L5vHkzXHXCBf6Eiy/EtUIvdiWAn+yASJ1mk5jZTBKO/WMAHD8wTO
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d/INMwXnR9U81O8+7LT6yw/ca4ppcFoJD7/XJbkRiML6+bJ4Dakiy6i727BzV17g
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ZtQ/VymwFL3XdUWV6B/hU4PVAFvO3qlOtdJ6TpE+nEWgcWjCv5g7RjXX
=MuOY
-----END PGP PUBLIC KEY BLOCK-----
"""
PRIVATE_KEY = """
-----BEGIN PGP PRIVATE KEY BLOCK-----
Version: GnuPG v1.4.10 (GNU/Linux)

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=JTFu
-----END PGP PRIVATE KEY BLOCK-----
"""