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Edit File : getpass.py \| Size : 5.43 KB
"""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 Back

Edit File : getpass.py | Size : 5.43 KB

"""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

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