from mock import patch
import time
import unittest
import uuid
from unittest import TestCase

from cryptography.fernet import Fernet
from werkzeug.exceptions import BadRequest
from mockredis import mock_strict_redis_client

# noinspection PyPep8Naming
import snappass.main as snappass

__author__ = 'davedash'


class SnapPassTestCase(TestCase):

    @patch('redis.client.StrictRedis', mock_strict_redis_client)
    def test_get_password(self):
        password = "melatonin overdose 1337!$"
        key = snappass.set_password(password, 30)
        self.assertEqual(password, snappass.get_password(key))
        # Assert that we can't look this up a second time.
        self.assertIsNone(snappass.get_password(key))

    def test_password_is_not_stored_in_plaintext(self):
        password = "trustno1"
        token = snappass.set_password(password, 30)
        redis_key = token.split(snappass.TOKEN_SEPARATOR)[0]
        stored_password_text = snappass.redis_client.get(redis_key).decode('utf-8')
        self.assertNotIn(password, stored_password_text)

    def test_returned_token_format(self):
        password = "trustsome1"
        token = snappass.set_password(password, 30)
        token_fragments = token.split(snappass.TOKEN_SEPARATOR)
        self.assertEqual(2, len(token_fragments))
        redis_key, encryption_key = token_fragments
        self.assertEqual(32 + len(snappass.REDIS_PREFIX), len(redis_key))
        try:
            Fernet(encryption_key.encode('utf-8'))
        except ValueError:
            self.fail('the encryption key is not valid')

    def test_encryption_key_is_returned(self):
        password = "trustany1"
        token = snappass.set_password(password, 30)
        token_fragments = token.split(snappass.TOKEN_SEPARATOR)
        redis_key, encryption_key = token_fragments
        stored_password = snappass.redis_client.get(redis_key)
        fernet = Fernet(encryption_key.encode('utf-8'))
        decrypted_password = fernet.decrypt(stored_password).decode('utf-8')
        self.assertEqual(password, decrypted_password)

    def test_unencrypted_passwords_still_work(self):
        unencrypted_password = "trustevery1"
        storage_key = uuid.uuid4().hex
        snappass.redis_client.setex(storage_key, 30, unencrypted_password)
        retrieved_password = snappass.get_password(storage_key)
        self.assertEqual(unencrypted_password, retrieved_password)

    def test_password_is_decoded(self):
        password = "correct horse battery staple"
        key = snappass.set_password(password, 30)
        self.assertFalse(isinstance(snappass.get_password(key), bytes))

    def test_clean_input(self):
        # Test Bad Data
        with snappass.app.test_request_context(
                "/", data={'password': 'foo', 'ttl': 'bar'}, method='POST'):
            self.assertRaises(BadRequest, snappass.clean_input)

        # No Password
        with snappass.app.test_request_context(
                "/", method='POST'):
            self.assertRaises(BadRequest, snappass.clean_input)

        # No TTL
        with snappass.app.test_request_context(
                "/", data={'password': 'foo'}, method='POST'):
            self.assertRaises(BadRequest, snappass.clean_input)

        with snappass.app.test_request_context(
                "/", data={'password': 'foo', 'ttl': 'hour'}, method='POST'):
            self.assertEqual((3600, 'foo'), snappass.clean_input())

    def test_password_before_expiration(self):
        password = 'fidelio'
        key = snappass.set_password(password, 1)
        self.assertEqual(password, snappass.get_password(key))

    def test_password_after_expiration(self):
        password = 'open sesame'
        key = snappass.set_password(password, 1)
        time.sleep(1.5)
        # Expire functionality must be explicitly invoked using do_expire(time).
        # mockredis does not support automatic expiration at this time
        snappass.redis_client.do_expire()
        self.assertIsNone(snappass.get_password(key))


class SnapPassRoutesTestCase(TestCase):
    # noinspection PyPep8Naming
    def setUp(self):
        snappass.app.config['TESTING'] = True
        self.app = snappass.app.test_client()

    def test_show_password(self):
        password = "I like novelty kitten statues!"
        key = snappass.set_password(password, 30)
        rv = self.app.get('/{0}'.format(key))
        self.assertIn(password, rv.get_data(as_text=True))

    def test_bots_denial(self):
        """
        Main known bots User-Agent should be denied access
        """
        password = "Bots can't access this"
        key = snappass.set_password(password, 30)
        a_few_sneaky_bots = [
            "Slackbot-LinkExpanding 1.0 (+https://api.slack.com/robots)",
            "facebookexternalhit/1.1",
            "Facebot/1.0",
            "Twitterbot/1.0",
            "_WhatsApp/2.12.81 (Windows NT 6.1; U; es-ES) Presto/2.9.181 Version/12.00",
            "WhatsApp/2.16.6/i",
            "SkypeUriPreview Preview/0.5",
            "Iframely/0.8.5 (+http://iframely.com/;)",
        ]

        for ua in a_few_sneaky_bots:
            rv = self.app.get('/{0}'.format(key), headers={'User-Agent': ua})
            self.assertEqual(404, rv.status_code)


if __name__ == '__main__':
    unittest.main()