1 files changed, 173 insertions, 0 deletions
diff --git a/lib-python/3/getpass.py b/lib-python/3/getpass.py
new file mode 100644
index 0000000000..dc02bd1eae
--- /dev/null
+++ b/lib-python/3/getpass.py
@@ -0,0 +1,173 @@
+"""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 as 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 as 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.putwch(c)
+    pw = ""
+    while 1:
+        c = msvcrt.getwch()
+        if c == '\r' or c == '\n':
+            break
+        if c == '\003':
+            raise KeyboardInterrupt
+        if c == '\b':
+            pw = pw[:-1]
+        else:
+            pw = pw + c
+    msvcrt.putwch('\r')
+    msvcrt.putwch('\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("Warning: Password input may be echoed.", file=stream)
+    return _raw_input(prompt, stream)
+
+
+def _raw_input(prompt="", stream=None, input=None):
+    # This 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:
+        getpass = fallback_getpass
+    else:
+        getpass = win_getpass
+else:
+    getpass = unix_getpass