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120 lines
2.5 KiB
Python
120 lines
2.5 KiB
Python
"""Utilities to get a password and/or the current user name.
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getpass(prompt) - prompt for a password, with echo turned off
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getuser() - get the user name from the environment or password database
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On Windows, the msvcrt module will be used.
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On the Mac EasyDialogs.AskPassword is used, if available.
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"""
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# Authors: Piers Lauder (original)
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# Guido van Rossum (Windows support and cleanup)
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import sys
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def unix_getpass(prompt='Password: '):
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"""Prompt for a password, with echo turned off.
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Restore terminal settings at end.
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"""
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try:
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fd = sys.stdin.fileno()
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except:
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return default_getpass(prompt)
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getpass = default_getpass
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old = termios.tcgetattr(fd) # a copy to save
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new = old[:]
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new[3] = new[3] & ~TERMIOS.ECHO # 3 == 'lflags'
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try:
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termios.tcsetattr(fd, TERMIOS.TCSADRAIN, new)
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passwd = _raw_input(prompt)
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finally:
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termios.tcsetattr(fd, TERMIOS.TCSADRAIN, old)
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sys.stdout.write('\n')
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return passwd
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def win_getpass(prompt='Password: '):
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"""Prompt for password with echo off, using Windows getch()."""
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import msvcrt
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for c in prompt:
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msvcrt.putch(c)
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pw = ""
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while 1:
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c = msvcrt.getch()
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if c == '\r' or c == '\n':
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break
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if c == '\003':
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raise KeyboardInterrupt
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if c == '\b':
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pw = pw[:-1]
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else:
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pw = pw + c
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msvcrt.putch('\r')
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msvcrt.putch('\n')
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return pw
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def default_getpass(prompt='Password: '):
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print "Warning: Problem with getpass. Passwords may be echoed."
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return _raw_input(prompt)
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def _raw_input(prompt=""):
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# A raw_input() replacement that doesn't save the string in the
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# GNU readline history.
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import sys
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prompt = str(prompt)
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if prompt:
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sys.stdout.write(prompt)
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line = sys.stdin.readline()
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if not line:
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raise EOFError
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if line[-1] == '\n':
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line = line[:-1]
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return line
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def getuser():
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"""Get the username from the environment or password database.
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First try various environment variables, then the password
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database. This works on Windows as long as USERNAME is set.
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"""
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import os
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for name in ('LOGNAME', 'USER', 'LNAME', 'USERNAME'):
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user = os.environ.get(name)
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if user:
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return user
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# If this fails, the exception will "explain" why
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import pwd
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return pwd.getpwuid(os.getuid())[0]
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# Bind the name getpass to the appropriate function
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try:
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import termios, TERMIOS
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except ImportError:
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try:
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import msvcrt
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except ImportError:
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try:
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from EasyDialogs import AskPassword
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except ImportError:
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getpass = default_getpass
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else:
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getpass = AskPassword
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else:
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getpass = win_getpass
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else:
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getpass = unix_getpass
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