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authorrahulp132020-03-17 14:55:41 +0530
committerrahulp132020-03-17 14:55:41 +0530
commit296443137f4288cb030e92859ccfbe3204bc1088 (patch)
treeca4798c2da1e7244edc3bc108d81b462b537aea2 /lib/python2.7/getpass.py
parent0db48f6533517ecebfd9f0693f89deca28408b76 (diff)
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diff --git a/lib/python2.7/getpass.py b/lib/python2.7/getpass.py
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+"""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