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#!/usr/bin/python3
# SPDX-License-Identifier: MIT
'''
Simple clipboard storing anything from stdin in a file or outputing from
the file to stdout. Direction is determined from pipe redirection.
Examples:
Store something to clipboard:
echo abc | clip
Output clipboard content to console:
clip
Use content:
clip > file
clip | command
'''
import contextlib
import functools
import getpass
import os
import sys
class Error(Exception): pass
class SecurityError(Error): pass
@contextlib.contextmanager
def secure_opendir(dirname):
os.makedirs(dirname, mode=0o700, exist_ok=True)
dfd = os.open(dirname, os.O_RDONLY | os.O_DIRECTORY)
try:
dir_stat = os.stat(dfd)
if (dir_stat.st_uid != os.getuid() or dir_stat.st_mode & 0o777 != 0o700):
raise SecurityError('Wrong directory permissions/owner')
yield dfd
finally:
os.close(dfd)
@contextlib.contextmanager
def secure_open(*l, **kw):
with secure_opendir(os.path.dirname(l[0])) as dfd:
_opener = functools.partial(os.open, dir_fd=dfd)
with open(*l, **kw, opener=_opener) as ffd:
yield ffd
if __name__ == '__main__':
os.umask(0o077)
clipboard_filepath = '/dev/shm/%s-clipboard/content' % getpass.getuser()
if(sys.stdin.isatty()):
# Should write clipboard contents out to stdout
try:
with secure_open(clipboard_filepath, 'rb') as fo:
sys.stdout.buffer.write(fo.read())
except FileNotFoundError:
# equivalent to an empty file
pass
elif(sys.stdout.isatty()):
# Should save stdin to clipboard
with secure_open(clipboard_filepath, 'wb') as fo:
fo.write(sys.stdin.buffer.read())
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