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# lad*j"Tځz@ؔţ m f """Utilities to get a password and/or the current user name. getpass(prompt[, stream]) - Prompt for a password, with echo turned off. getuser() - Get the user name from the environment or password database. GetPassWarning - This UserWarning is issued when getpass() cannot prevent echoing of the password contents while reading. On Windows, the msvcrt module will be used. """ # Authors: Piers Lauder (original) # Guido van Rossum (Windows support and cleanup) # Gregory P. Smith (tty support & GetPassWarning) import contextlib import io import os import sys import warnings __all__ = ["getpass","getuser","GetPassWarning"] class GetPassWarning(UserWarning): pass def unix_getpass(prompt='Password: ', stream=None): """Prompt for a password, with echo turned off. Args: prompt: Written on stream to ask for the input. Default: 'Password: ' stream: A writable file object to display the prompt. Defaults to the tty. If no tty is available defaults to sys.stderr. Returns: The seKr3t input. Raises: EOFError: If our input tty or stdin was closed. GetPassWarning: When we were unable to turn echo off on the input. Always restores terminal settings before returning. """ passwd = None with contextlib.ExitStack() as stack: try: # Always try reading and writing directly on the tty first. fd = os.open('/dev/tty', os.O_RDWR|os.O_NOCTTY) tty = io.FileIO(fd, 'w+') stack.enter_context(tty) input = io.TextIOWrapper(tty) stack.enter_context(input) if not stream: stream = input except OSError: # If that fails, see if stdin can be controlled. stack.close() try: fd = sys.stdin.fileno() except (AttributeError, ValueError): fd = None passwd = fallback_getpass(prompt, stream) input = sys.stdin if not stream: stream = sys.stderr if fd is not None: try: old = termios.tcgetattr(fd) # a copy to save new = old[:] new[3] &= ~termios.ECHO # 3 == 'lflags' tcsetattr_flags = termios.TCSAFLUSH if hasattr(termios, 'TCSASOFT'): tcsetattr_flags |= termios.TCSASOFT try: termios.tcsetattr(fd, tcsetattr_flags, new) passwd = _raw_input(prompt, stream, input=input) finally: termios.tcsetattr(fd, tcsetattr_flags, old) stream.flush() # issue7208 except termios.error: if passwd is not None: # _raw_input succeeded. The final tcsetattr failed. Reraise # instead of leaving the terminal in an unknown state. raise # We can't control the tty or stdin. Give up and use normal IO. # fallback_getpass() raises an appropriate warning. if stream is not input: # clean up unused file objects before blocking stack.close() passwd = fallback_getpass(prompt, stream) stream.write('\n') return passwd def win_getpass(prompt='Password: ', stream=None): """Prompt for password with echo off, using Windows getwch().""" if sys.stdin is not sys.__stdin__: return fallback_getpass(prompt, stream) fo