Mercurial > cpython-lru_cache-weakref

annotate Lib/getpass.py @ 78069:a8aa77458e12 3.2

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Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents 154b323e0e7f
children fa82071bb7e1
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91ecda9d5245 Another new utility: getpass() prompts for a password, with echo off.
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1 """Utilities to get a password and/or the current user name.
91ecda9d5245 Another new utility: getpass() prompts for a password, with echo off.
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3 getpass(prompt[, stream]) - Prompt for a password, with echo turned off.
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4 getuser() - Get the user name from the environment or password database.
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6 GetPassWarning - This UserWarning is issued when getpass() cannot prevent
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7 echoing of the password contents while reading.
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8
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9 On Windows, the msvcrt module will be used.
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10 On the Mac EasyDialogs.AskPassword is used, if available.
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11
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12 """
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14 # Authors: Piers Lauder (original)
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15 # Guido van Rossum (Windows support and cleanup)
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16 # Gregory P. Smith (tty support & GetPassWarning)
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18 import os, sys, warnings
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20 __all__ = ["getpass","getuser","GetPassWarning"]
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23 class GetPassWarning(UserWarning): pass
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24
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25
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26 def unix_getpass(prompt='Password: ', stream=None):
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27 """Prompt for a password, with echo turned off.
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29 Args:
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30 prompt: Written on stream to ask for the input. Default: 'Password: '
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31 stream: A writable file object to display the prompt. Defaults to
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32 the tty. If no tty is available defaults to sys.stderr.
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33 Returns:
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34 The seKr3t input.
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35 Raises:
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36 EOFError: If our input tty or stdin was closed.
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37 GetPassWarning: When we were unable to turn echo off on the input.
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38
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39 Always restores terminal settings before returning.
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40 """
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41 fd = None
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42 tty = None
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43 try:
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44 # Always try reading and writing directly on the tty first.
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45 fd = os.open('/dev/tty', os.O_RDWR|os.O_NOCTTY)
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46 tty = os.fdopen(fd, 'w+', 1)
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diff changeset
47 input = tty
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diff changeset
48 if not stream:
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diff changeset
49 stream = tty
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diff changeset
50 except EnvironmentError as e:
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diff changeset
51 # If that fails, see if stdin can be controlled.
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diff changeset
52 try:
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diff changeset
53 fd = sys.stdin.fileno()
56368
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diff changeset
54 except (AttributeError, ValueError):
46664
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diff changeset
55 passwd = fallback_getpass(prompt, stream)
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diff changeset
56 input = sys.stdin
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diff changeset
57 if not stream:
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diff changeset
58 stream = sys.stderr
7941
91ecda9d5245 Another new utility: getpass() prompts for a password, with echo off.
Guido van Rossum <guido@python.org>
parents:
diff changeset
59
46664
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diff changeset
60 if fd is not None:
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diff changeset
61 passwd = None
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parents: 44414
diff changeset
62 try:
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diff changeset
63 old = termios.tcgetattr(fd) # a copy to save
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parents: 44414
diff changeset
64 new = old[:]
69566
154b323e0e7f Fix for issue11236 getpass.getpass to respond ctrl-c or ctrl-z
Senthil Kumaran <orsenthil@gmail.com>
parents: 66961
diff changeset
65 new[3] &= ~termios.ECHO # 3 == 'lflags'
57034
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66 tcsetattr_flags = termios.TCSAFLUSH
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diff changeset
67 if hasattr(termios, 'TCSASOFT'):
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parents: 56368
diff changeset
68 tcsetattr_flags |= termios.TCSASOFT
46664
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diff changeset
69 try:
57034
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diff changeset
70 termios.tcsetattr(fd, tcsetattr_flags, new)
46664
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diff changeset
71 passwd = _raw_input(prompt, stream, input=input)
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diff changeset
72 finally:
57034
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73 termios.tcsetattr(fd, tcsetattr_flags, old)
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diff changeset
74 stream.flush() # issue7208
46664
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parents: 44414
diff changeset
75 except termios.error as e:
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diff changeset
76 if passwd is not None:
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diff changeset
77 # _raw_input succeeded. The final tcsetattr failed. Reraise
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diff changeset
78 # instead of leaving the terminal in an unknown state.
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diff changeset
79 raise
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parents: 44414
diff changeset
80 # We can't control the tty or stdin. Give up and use normal IO.
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diff changeset
81 # fallback_getpass() raises an appropriate warning.
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diff changeset
82 del input, tty # clean up unused file objects before blocking
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diff changeset
83 passwd = fallback_getpass(prompt, stream)
7941
91ecda9d5245 Another new utility: getpass() prompts for a password, with echo off.
Guido van Rossum <guido@python.org>
parents:
diff changeset
84
37879
f731859e9b3b Merge p3yk branch with the trunk up to revision 45595. This breaks a fair
Thomas Wouters <thomas@python.org>
parents: 37045
diff changeset
85 stream.write('\n')
15868
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
diff changeset
86 return passwd
7941
91ecda9d5245 Another new utility: getpass() prompts for a password, with echo off.
Guido van Rossum <guido@python.org>
parents:
diff changeset
87
91ecda9d5245 Another new utility: getpass() prompts for a password, with echo off.
Guido van Rossum <guido@python.org>
parents:
diff changeset
88
37879
f731859e9b3b Merge p3yk branch with the trunk up to revision 45595. This breaks a fair
Thomas Wouters <thomas@python.org>
parents: 37045
diff changeset
89 def win_getpass(prompt='Password: ', stream=None):
15868
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
diff changeset
90 """Prompt for password with echo off, using Windows getch()."""
19606
6d5ac3c43416 win_getpass(): if sys.stdin is not sys.__stdin__, use
Guido van Rossum <guido@python.org>
parents: 19226
diff changeset
91 if sys.stdin is not sys.__stdin__:
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92 return fallback_getpass(prompt, stream)
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93 import msvcrt
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94 for c in prompt:
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95 msvcrt.putwch(c)
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96 pw = ""
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97 while 1:
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98 c = msvcrt.getwch()
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99 if c == '\r' or c == '\n':
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100 break
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101 if c == '\003':
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102 raise KeyboardInterrupt
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103 if c == '\b':
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104 pw = pw[:-1]
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105 else:
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106 pw = pw + c
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107 msvcrt.putwch('\r')
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108 msvcrt.putwch('\n')
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109 return pw
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110
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111
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112 def fallback_getpass(prompt='Password: ', stream=None):
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113 warnings.warn("Can not control echo on the terminal.", GetPassWarning,
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114 stacklevel=2)
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115 if not stream:
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116 stream = sys.stderr
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117 print("Warning: Password input may be echoed.", file=stream)
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118 return _raw_input(prompt, stream)
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119
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120
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121 def _raw_input(prompt="", stream=None, input=None):
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122 # This doesn't save the string in the GNU readline history.
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123 if not stream:
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124 stream = sys.stderr
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125 if not input:
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126 input = sys.stdin
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127 prompt = str(prompt)
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128 if prompt:
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129 stream.write(prompt)
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130 stream.flush()
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131 # NOTE: The Python C API calls flockfile() (and unlock) during readline.
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132 line = input.readline()
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133 if not line:
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134 raise EOFError
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135 if line[-1] == '\n':
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136 line = line[:-1]
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137 return line
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138
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139
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140 def getuser():
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141 """Get the username from the environment or password database.
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142
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143 First try various environment variables, then the password
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144 database. This works on Windows as long as USERNAME is set.
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145
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146 """
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147
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148 import os
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149
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150 for name in ('LOGNAME', 'USER', 'LNAME', 'USERNAME'):
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151 user = os.environ.get(name)
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152 if user:
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153 return user
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154
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155 # If this fails, the exception will "explain" why
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156 import pwd
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157 return pwd.getpwuid(os.getuid())[0]
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158
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159 # Bind the name getpass to the appropriate function
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160 try:
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161 import termios
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162 # it's possible there is an incompatible termios from the
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163 # McMillan Installer, make sure we have a UNIX-compatible termios
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164 termios.tcgetattr, termios.tcsetattr
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165 except (ImportError, AttributeError):
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166 try:
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167 import msvcrt
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168 except ImportError:
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169 getpass = fallback_getpass
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170 else:
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171 getpass = win_getpass
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172 else:
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173 getpass = unix_getpass