"""Utilities to get a password and/or the current user name. getpass(prompt) - prompt for a password, with echo turned offgetuser() - 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 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):    try:        ctl = open("/dev/consctl", "w")        ctl.write("rawon")        ctl.flush()        buf = _raw_input(prompt, stream)        ctl.write("rawoff")        ctl.flush()        ctl.close()        return buf;    except:        buf = _raw_input(prompt, stream)    return buf 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)        stream.flush()    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 functiontry:    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.tcsetattrexcept (ImportError, AttributeError):    getpass = default_getpasselse:    getpass = unix_getpass