diff options
author | rahulp13 | 2020-03-17 14:55:41 +0530 |
---|---|---|
committer | rahulp13 | 2020-03-17 14:55:41 +0530 |
commit | 296443137f4288cb030e92859ccfbe3204bc1088 (patch) | |
tree | ca4798c2da1e7244edc3bc108d81b462b537aea2 /lib/python2.7/getpass.py | |
parent | 0db48f6533517ecebfd9f0693f89deca28408b76 (diff) | |
download | KiCad-eSim-296443137f4288cb030e92859ccfbe3204bc1088.tar.gz KiCad-eSim-296443137f4288cb030e92859ccfbe3204bc1088.tar.bz2 KiCad-eSim-296443137f4288cb030e92859ccfbe3204bc1088.zip |
initial commit
Diffstat (limited to 'lib/python2.7/getpass.py')
-rw-r--r-- | lib/python2.7/getpass.py | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/lib/python2.7/getpass.py b/lib/python2.7/getpass.py new file mode 100644 index 0000000..2ac6fd7 --- /dev/null +++ b/lib/python2.7/getpass.py @@ -0,0 +1,179 @@ +"""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. +On the Mac EasyDialogs.AskPassword is used, if available. + +""" + +# Authors: Piers Lauder (original) +# Guido van Rossum (Windows support and cleanup) +# Gregory P. Smith (tty support & GetPassWarning) + +import os, sys, 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. + """ + fd = None + tty = None + try: + # Always try reading and writing directly on the tty first. + fd = os.open('/dev/tty', os.O_RDWR|os.O_NOCTTY) + tty = os.fdopen(fd, 'w+', 1) + input = tty + if not stream: + stream = tty + except EnvironmentError, e: + # If that fails, see if stdin can be controlled. + try: + fd = sys.stdin.fileno() + except (AttributeError, ValueError): + passwd = fallback_getpass(prompt, stream) + input = sys.stdin + if not stream: + stream = sys.stderr + + if fd is not None: + passwd = 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, e: + 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. + del input, tty # clean up unused file objects before blocking + 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 getch().""" + if sys.stdin is not sys.__stdin__: + return fallback_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 fallback_getpass(prompt='Password: ', stream=None): + warnings.warn("Can not control echo on the terminal.", GetPassWarning, + stacklevel=2) + if not stream: + stream = sys.stderr + print >>stream, "Warning: Password input may be echoed." + return _raw_input(prompt, stream) + + +def _raw_input(prompt="", stream=None, input=None): + # A raw_input() replacement that doesn't save the string in the + # GNU readline history. + if not stream: + stream = sys.stderr + if not input: + input = sys.stdin + prompt = str(prompt) + if prompt: + stream.write(prompt) + stream.flush() + # NOTE: The Python C API calls flockfile() (and unlock) during readline. + line = input.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 = fallback_getpass + else: + getpass = AskPassword + else: + getpass = win_getpass +else: + getpass = unix_getpass |