1import getpass
2import os
3import unittest
4from io import BytesIO, StringIO, TextIOWrapper
5from unittest import mock
6from test import support
7
8try:
9    import termios
10except ImportError:
11    termios = None
12try:
13    import pwd
14except ImportError:
15    pwd = None
16
17@mock.patch('os.environ')
18class GetpassGetuserTest(unittest.TestCase):
19
20    def test_username_takes_username_from_env(self, environ):
21        expected_name = 'some_name'
22        environ.get.return_value = expected_name
23        self.assertEqual(expected_name, getpass.getuser())
24
25    def test_username_priorities_of_env_values(self, environ):
26        environ.get.return_value = None
27        try:
28            getpass.getuser()
29        except ImportError: # in case there's no pwd module
30            pass
31        self.assertEqual(
32            environ.get.call_args_list,
33            [mock.call(x) for x in ('LOGNAME', 'USER', 'LNAME', 'USERNAME')])
34
35    def test_username_falls_back_to_pwd(self, environ):
36        expected_name = 'some_name'
37        environ.get.return_value = None
38        if pwd:
39            with mock.patch('os.getuid') as uid, \
40                    mock.patch('pwd.getpwuid') as getpw:
41                uid.return_value = 42
42                getpw.return_value = [expected_name]
43                self.assertEqual(expected_name,
44                                 getpass.getuser())
45                getpw.assert_called_once_with(42)
46        else:
47            self.assertRaises(ImportError, getpass.getuser)
48
49
50class GetpassRawinputTest(unittest.TestCase):
51
52    def test_flushes_stream_after_prompt(self):
53        # see issue 1703
54        stream = mock.Mock(spec=StringIO)
55        input = StringIO('input_string')
56        getpass._raw_input('some_prompt', stream, input=input)
57        stream.flush.assert_called_once_with()
58
59    def test_uses_stderr_as_default(self):
60        input = StringIO('input_string')
61        prompt = 'some_prompt'
62        with mock.patch('sys.stderr') as stderr:
63            getpass._raw_input(prompt, input=input)
64            stderr.write.assert_called_once_with(prompt)
65
66    @mock.patch('sys.stdin')
67    def test_uses_stdin_as_default_input(self, mock_input):
68        mock_input.readline.return_value = 'input_string'
69        getpass._raw_input(stream=StringIO())
70        mock_input.readline.assert_called_once_with()
71
72    @mock.patch('sys.stdin')
73    def test_uses_stdin_as_different_locale(self, mock_input):
74        stream = TextIOWrapper(BytesIO(), encoding="ascii")
75        mock_input.readline.return_value = "Hasło: "
76        getpass._raw_input(prompt="Hasło: ",stream=stream)
77        mock_input.readline.assert_called_once_with()
78
79
80    def test_raises_on_empty_input(self):
81        input = StringIO('')
82        self.assertRaises(EOFError, getpass._raw_input, input=input)
83
84    def test_trims_trailing_newline(self):
85        input = StringIO('test\n')
86        self.assertEqual('test', getpass._raw_input(input=input))
87
88
89# Some of these tests are a bit white-box.  The functional requirement is that
90# the password input be taken directly from the tty, and that it not be echoed
91# on the screen, unless we are falling back to stderr/stdin.
92
93# Some of these might run on platforms without termios, but play it safe.
94@unittest.skipUnless(termios, 'tests require system with termios')
95class UnixGetpassTest(unittest.TestCase):
96
97    def test_uses_tty_directly(self):
98        with mock.patch('os.open') as open, \
99                mock.patch('io.FileIO') as fileio, \
100                mock.patch('io.TextIOWrapper') as textio:
101            # By setting open's return value to None the implementation will
102            # skip code we don't care about in this test.  We can mock this out
103            # fully if an alternate implementation works differently.
104            open.return_value = None
105            getpass.unix_getpass()
106            open.assert_called_once_with('/dev/tty',
107                                         os.O_RDWR | os.O_NOCTTY)
108            fileio.assert_called_once_with(open.return_value, 'w+')
109            textio.assert_called_once_with(fileio.return_value)
110
111    def test_resets_termios(self):
112        with mock.patch('os.open') as open, \
113                mock.patch('io.FileIO'), \
114                mock.patch('io.TextIOWrapper'), \
115                mock.patch('termios.tcgetattr') as tcgetattr, \
116                mock.patch('termios.tcsetattr') as tcsetattr:
117            open.return_value = 3
118            fake_attrs = [255, 255, 255, 255, 255]
119            tcgetattr.return_value = list(fake_attrs)
120            getpass.unix_getpass()
121            tcsetattr.assert_called_with(3, mock.ANY, fake_attrs)
122
123    def test_falls_back_to_fallback_if_termios_raises(self):
124        with mock.patch('os.open') as open, \
125                mock.patch('io.FileIO') as fileio, \
126                mock.patch('io.TextIOWrapper') as textio, \
127                mock.patch('termios.tcgetattr'), \
128                mock.patch('termios.tcsetattr') as tcsetattr, \
129                mock.patch('getpass.fallback_getpass') as fallback:
130            open.return_value = 3
131            fileio.return_value = BytesIO()
132            tcsetattr.side_effect = termios.error
133            getpass.unix_getpass()
134            fallback.assert_called_once_with('Password: ',
135                                             textio.return_value)
136
137    def test_flushes_stream_after_input(self):
138        # issue 7208
139        with mock.patch('os.open') as open, \
140                mock.patch('io.FileIO'), \
141                mock.patch('io.TextIOWrapper'), \
142                mock.patch('termios.tcgetattr'), \
143                mock.patch('termios.tcsetattr'):
144            open.return_value = 3
145            mock_stream = mock.Mock(spec=StringIO)
146            getpass.unix_getpass(stream=mock_stream)
147            mock_stream.flush.assert_called_with()
148
149    def test_falls_back_to_stdin(self):
150        with mock.patch('os.open') as os_open, \
151                mock.patch('sys.stdin', spec=StringIO) as stdin:
152            os_open.side_effect = IOError
153            stdin.fileno.side_effect = AttributeError
154            with support.captured_stderr() as stderr:
155                with self.assertWarns(getpass.GetPassWarning):
156                    getpass.unix_getpass()
157            stdin.readline.assert_called_once_with()
158            self.assertIn('Warning', stderr.getvalue())
159            self.assertIn('Password:', stderr.getvalue())
160
161
162if __name__ == "__main__":
163    unittest.main()
164