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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 getpass
import os
import sys
class Error(Exception): pass
class SecurityError(Error): pass
def fileno(filelike):
if getattr(filelike, 'fileno'):
return filelike.fileno()
elif getattr(filelike, 'buffer'):
return filelike.buffer.fileno()
raise Error("fileno not found inside file-like object")
@contextlib.contextmanager
def secure_open(path, mode='r', *l, **kw):
if os.path.islink(path):
raise SecurityError("The clipboard file can not be a symlink")
real_mode = mode.replace('w', 'a')
with open(path, real_mode, *l, **kw) as fo:
if os.fstat(fileno(fo)) != os.stat(path):
raise SecurityError("Intrusion might have been done on %s" % path)
if 'w' in mode:
os.lseek(fileno(fo), 0, os.SEEK_SET)
os.ftruncate(fileno(fo), 0)
os.fchmod(fileno(fo), 0o600)
yield fo
if __name__ == '__main__':
os.umask(0o077)
clipboard_filepath = '/dev/shm/%s-clipboard' % 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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