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client.py
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client.py
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#!/usr/bin/env python
import socket
import sys
import pathlib
from pickle import loads, dumps
import rsa
from ui import Ui_Window
from PyQt5.QtWidgets import QApplication, QMainWindow, QFileDialog, QMessageBox
from PyQt5.QtCore import Qt, QTimer
def encrypt(bytes_list, public_key, piece=117):
l = len(bytes_list)
k = l // piece
last = bytes_list[k * piece:]
return [rsa.encrypt(bytes_list[piece * i:piece * (i + 1)], public_key) for i in range(k)] + [
rsa.encrypt(last, public_key)]
def decrypt(crypted_list, privkey):
res = bytes()
for el in crypted_list:
res += rsa.decrypt(el, privkey)
return res
class Backend:
def __init__(self, port):
self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.s.setblocking(False) # Socket non-block
self.s.bind(('', port)) # Binding port
self.s.listen(1)
self.conn = 0
self.message_id = 0
self.temporary = {}
self.connected = False
(self.pubkey, self.privkey) = rsa.newkeys(1024)
self.connect_pubkey = None
self.port = port
self.connect_address = ()
def file_sender(self, fname):
if fname != '':
f = open(fname, 'rb')
data = f.read()
f.close()
encrypted = encrypt(dumps({'file': data, 'file_name': pathlib.Path(fname).name}),
self.connect_pubkey)
self.send_request({'type': 'file', 'data': encrypted})
self.message_id += 1
return 'Me > [File ' + fname + ']'
def exchange_keys(self):
self.send_request({'type': 'connect', 'data': {'pubkey': self.pubkey}})
def change_socket(self, port: int):
self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.s.setblocking(False) # Socket non-block
self.s.bind(('', port)) # Binding port
self.s.listen(1)
def send_request(self, request):
pieces = 5
request['ip'] = self.send_address[0]
request['request_id'] = self.message_id
data = request['data']
cnt = len(data) // pieces
if len(data) % pieces != 0:
cnt += 1
request['count_of_packets'] = cnt
for i in range(cnt):
packet = request
packet['packet_number'] = i + 1
packet['data'] = data[pieces * i: pieces * (i + 1)]
self.s.send(dumps(packet))
def connect(self, ip):
if not self.connected:
try:
self.connected = True
self.connect_address = (ip, self.port)
self.s.connect(self.connect_address)
self.exchange_keys()
return 0
except Exception as exc:
self.connect_address = ()
# QMessageBox.critical(self, str(type(exc))[8:-2], 'Connection failed\n\n' + str(exc), QMessageBox.Ok)
self.connected = False
self.unlock_ui()
return 'Connection failed\n\n' + str(exc)
else:
self.s.close()
self.connected = False
self.connect(ip=ip)
def message_handler(self, request, address):
if request['type'] == 'message':
request_id = request['request_id']
if address[0] not in self.temporary.keys():
self.temporary[address[0]] = {}
if request['request_id'] not in self.temporary[address[0]]:
self.temporary[address[0]][request_id] = {}
try:
maximum = max(self.temporary[address[0]][request_id].keys()) + 1
except ValueError:
maximum = 0
self.temporary[address[0]][request_id][maximum] = request['data']
if len(self.temporary[address[0]][request_id].keys()) == request['count_of_packets']:
data = []
for el in self.temporary[address[0]][request_id].values():
data += el
del self.temporary[address[0]][request_id]
data = loads(decrypt(data, self.privkey))
self.temporary[address[0]][request['request_id']] = []
text = data['text']
# self.ui.plainText.appendPlainText(address[0] + ':' + str(address[1]) + ' > ' + text)
return address[0] + ':' + str(address[1]) + ' > ' + text
elif request['type'] == 'connect':
self.connect_pubkey = request['data']['pubkey']
elif request['type'] == 'file':
request_id = request['request_id']
if address[0] not in self.temporary.keys():
self.temporary[address[0]] = {}
if request['request_id'] not in self.temporary[address[0]]:
self.temporary[address[0]][request_id] = {}
try:
maximum = max(self.temporary[address[0]][request_id].keys()) + 1
except ValueError:
maximum = 0
self.temporary[address[0]][request_id][maximum] = request['data']
if len(self.temporary[address[0]][request_id].keys()) == request['count_of_packets']:
data = []
for el in self.temporary[address[0]][request_id].values():
data += el
del self.temporary[address[0]][request_id]
decrypted = loads(decrypt(data, self.privkey))
fname = QFileDialog.getSaveFileName(self, 'Сохранить файл ' + decrypted['file_name'])[0]
if fname != '':
f = open(fname, 'wb')
f.write(decrypted['file'])
f.close()
self.ui.plainText.appendPlainText(address[0] + ':' + address[1] + ' > [File ' + fname + ']')
def reciever(self):
try:
if not self.connected:
self.conn, self.connect_address = self.s.accept()
else:
print(self.conn)
message = self.conn.recv(1024)
self.message_handler(loads(message), self.connect_address)
except BlockingIOError:
pass
def send_message(self, text):
if text != '':
encrypted = encrypt(dumps({'text': text}), self.connect_pubkey)
request = {'type': 'message', 'data': encrypted}
self.send_request(request) # sending text
self.message_id += 1
return 'Me > ' + text
class Window(QMainWindow):
def __init__(self):
# Инициализация
super().__init__()
self.ui = Ui_Window()
self.ui.setupUi(self)
self.engine = Backend(port=int(self.ui.port.text()))
timer = QTimer(self)
timer.setInterval(50)
timer.timeout.connect(self.engine.reciever)
timer.start()
self.ui.pushButton.clicked.connect(self.send_message)
self.ui.pushButton_2.clicked.connect(self.change_socket)
self.ui.pushButton_3.clicked.connect(self.connect)
self.ui.send_file.clicked.connect(self.send_file)
self.ui.label_2.setText('Now your IP seems to be ' + socket.gethostbyname(socket.getfqdn()))
def send_message(self):
text = self.engine.send_message(self.ui.lineEdit.text())
self.ui.plainText.appendPlainText(text)
self.ui.lineEdit.setText('')
def send_file(self):
text = self.engine.file_sender(QFileDialog.getOpenFileName(self, 'Выбрать файл', '')[0])
self.ui.plainText.appendPlainText(text)
def connect(self):
self.engine.connect(self.ui.reciever_ip.text())
def change_socket(self):
self.engine.change_socket(self.ui.port.text())
def lock_ui(self):
self.ui.port.setEnabled(False)
self.ui.pushButton_2.setEnabled(False)
self.ui.send_file.setEnabled(True)
self.ui.pushButton.setEnabled(True)
self.ui.pushButton_3.setText('DISCONNECT')
def unlock_ui(self):
self.ui.port.setEnabled(True)
self.ui.pushButton_2.setEnabled(True)
self.ui.send_file.setEnabled(False)
self.ui.pushButton.setEnabled(False)
self.ui.pushButton_3.setText('CONNECT')
def keyPressEvent(self, event):
if event.key() == Qt.Key_Enter - 1 and self.ui.reciever_ip.text().count(
'.') == 3 and self.ui.pushButton.isEnabled():
self.send_message()
app = QApplication(sys.argv)
ex = Window()
ex.show()
sys.exit(app.exec_())