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<a href="/plan9/">Plan 9 from Bell Labs</a>’s /usr/web/sources/contrib/john/getpass.py


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Copyright © 2009 Alcatel-Lucent. 
Distributed under the
<a href="/plan9/license.html">Lucent Public License version 1.02</a>.
 
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"""Utilities to get a password and/or the current user name.

getpass(prompt) - prompt for a password, with echo turned off
getuser() - get the user name from the environment or password database

On Windows, the msvcrt module will be used.
On the Mac EasyDialogs.AskPassword is used, if available.

"""

# Authors: Piers Lauder (original)
# Guido van Rossum (Windows support and cleanup)

import sys

__all__ = ["getpass","getuser"]

def plan9_getpass(prompt='Password: ', stream=None):
if stream is None:
stream = sys.stdout

try:
fd = open('/dev/consctl', 'w')
except:
return default_getpass(prompt)

stream.write(prompt)
stream.flush()
fd.write('rawon')
fd.flush()
passwd = sys.stdin.readline()
if not passwd:
raise EOFError
if passwd[-1] == '\n':
passwd = passwd[:-1]
fd.write('rawoff')
fd.flush()
stream.write('\n')
stream.flush()

return passwd

def unix_getpass(prompt='Password: ', stream=None):
"""Prompt for a password, with echo turned off.
The prompt is written on stream, by default stdout.

Restore terminal settings at end.
"""
if stream is None:
stream = sys.stdout

try:
fd = sys.stdin.fileno()
except:
return default_getpass(prompt)

old = termios.tcgetattr(fd) # a copy to save
new = old[:]

new[3] = new[3] & ~termios.ECHO # 3 == 'lflags'
try:
termios.tcsetattr(fd, termios.TCSADRAIN, new)
passwd = _raw_input(prompt, stream)
finally:
termios.tcsetattr(fd, termios.TCSADRAIN, old)

stream.write('\n')
return passwd

def win_getpass(prompt='Password: ', stream=None):
"""Prompt for password with echo off, using Windows getch()."""
if sys.stdin is not sys.__stdin__:
return default_getpass(prompt, stream)
import msvcrt
for c in prompt:
msvcrt.putch(c)
pw = ""
while 1:
c = msvcrt.getch()
if c == '\r' or c == '\n':
break
if c == '\003':
raise KeyboardInterrupt
if c == '\b':
pw = pw[:-1]
else:
pw = pw + c
msvcrt.putch('\r')
msvcrt.putch('\n')
return pw

def default_getpass(prompt='Password: ', stream=None):
print >>sys.stderr, "Warning: Problem with getpass. Passwords may be echoed."
return _raw_input(prompt, stream)

def _raw_input(prompt="", stream=None):
# A raw_input() replacement that doesn't save the string in the
# GNU readline history.
if stream is None:
stream = sys.stdout
prompt = str(prompt)
if prompt:
stream.write(prompt)
line = sys.stdin.readline()
if not line:
raise EOFError
if line[-1] == '\n':
line = line[:-1]
return line

def getuser():
"""Get the username from the environment or password database.

First try various environment variables, then the password
database. This works on Windows as long as USERNAME is set.

"""

import os

for name in ('LOGNAME', 'USER', 'LNAME', 'USERNAME'):
user = os.environ.get(name)
if user:
return user

# If this fails, the exception will "explain" why
import pwd
return pwd.getpwuid(os.getuid())[0]

# Bind the name getpass to the appropriate function
#try:
import termios
# it's possible there is an incompatible termios from the
# McMillan Installer, make sure we have a UNIX-compatible termios
termios.tcgetattr, termios.tcsetattr
#except (ImportError, AttributeError):
# try:
# import msvcrt
# except ImportError:
# try:
# from EasyDialogs import AskPassword
# except ImportError:
# getpass = default_getpass
# else:
# getpass = AskPassword
# else:
# getpass = win_getpass
#else:
# getpass = unix_getpass
getpass = plan9_getpass


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