Shares clipboard with LAN.

clipshare.py

#!/usr/bin/env python
import socket
import logging
import zlib
from threading import Thread
from PyQt4.QtGui import QApplication
from PyQt4.QtNetwork import QUdpSocket, QHostAddress


# Config
SHARE_PORT = 31256
BROADCAST_ADDR = '192.168.1.255'
MAX_TEXT_SIZE = 1024

class ClipShare(object):
    def __init__(self):
        # Setup logger
        self.logger = logging.getLogger("clipshare")
        self.logger.setLevel(logging.DEBUG)
        ch = logging.StreamHandler()
        ch.setLevel(logging.DEBUG)
        formatter = logging.Formatter("[%(asctime)s][%(levelname)s]: %(message)s")
        ch.setFormatter(formatter)
        self.logger.addHandler(ch)

        self.cliptext = ''
        self.recvtext = ''
        
        # Setup Qt application
        self.app = QApplication([])
        self.clip = self.app.clipboard()
        self.clip.dataChanged.connect(self.cb_change)

        # Setup UDP socket
        self.sock = QUdpSocket()
        self.sock.bind(SHARE_PORT, QUdpSocket.ShareAddress)    
        self.sock.readyRead.connect(self.receive)
        
    # Incoming datagram handler
    def receive(self):
        while self.sock.hasPendingDatagrams():
            data, host, port = self.sock.readDatagram(self.sock.pendingDatagramSize())
            data = zlib.decompress(data).decode('utf-8')
            if data == self.cliptext:
                self.logger.debug('Caught own broadcast, ignoring.')
                return
            self.logger.debug('Listener received data from %s: %s' %
                              (host.toString(), data))
            self.recvtext = data
            self.clip.setText(data)

    # Clipboard change handler
    def cb_change(self):
        text = self.clip.text()
        if text == self.recvtext:
            self.logger.debug('Caught clipshare clipboard update, ignoring.')
            return
        text = unicode(text).encode('utf-8')
        self.logger.debug('Clipboard updated, content length is %d.' % len(text))
        if len(text) > MAX_TEXT_SIZE:
            self.logger.debug('New board content over size limit, ignoring.')
        elif text == self.cliptext:
            self.logger.debug('Updated content identical, ignoring.')
        else:
            self.cliptext = text
            self.logger.info('Sending clipboard content.')
            self.sock.writeDatagram(zlib.compress(text), QHostAddress(BROADCAST_ADDR),
                                    SHARE_PORT)

if __name__ == '__main__':
    cs = ClipShare()
    cs.app.exec_()