Add filetransfer application.

#!/usr/bin/env python3

# -*- coding: utf-8 -*-

# Copyright (C) 2018 Andy Stewart

#

# Author:     Andy Stewart <lazycat.manatee@gmail.com>

# Maintainer: Andy Stewart <lazycat.manatee@gmail.com>

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from PyQt5.QtCore import Qt

from PyQt5.QtGui import QColor, QPixmap, QImage, QFont

from PyQt5 import QtGui, QtCore

from PyQt5.QtGui import QColor, QPixmap, QPainter

from PyQt5.QtWidgets import QApplication

from PyQt5.QtWidgets import QWidget, QLabel

from PyQt5.QtWidgets import QWidget, QVBoxLayout

import http.server as BaseHTTPServer

import os

import qrcode

import shutil

import socket

import sys

import threading

from core.buffer import Buffer

class AppBuffer(Buffer):

    def __init__(self, buffer_id, url):

        Buffer.__init__(self, buffer_id, url, False, QColor(0, 0, 0, 255))

        self.add_widget(FileTransferWidget(url, QColor(0, 0, 0, 255)))

class SimpleHTTPRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):

    def do_GET(self):

        global local_file_path

        with open(local_file_path, 'rb') as f:

            self.send_response(200)

            self.send_header("Content-Type", 'application/octet-stream')

            self.send_header("Content-Disposition", 'attachment; filename="{}"'.format(os.path.basename(local_file_path)))

            fs = os.fstat(f.fileno())

            self.send_header("Content-Length", str(fs.st_size))

            self.end_headers()

            shutil.copyfileobj(f, self.wfile)

class Image(qrcode.image.base.BaseImage):

    def __init__(self, border, width, box_size):

        self.border = border

        self.width = width

        self.box_size = box_size

        size = (width + border * 2) * box_size

        self._image = QtGui.QImage(size, size, QtGui.QImage.Format_RGB16)

        self._image.fill(QtCore.Qt.white)

    def pixmap(self):

        return QtGui.QPixmap.fromImage(self._image)

    def drawrect(self, row, col):

        painter = QtGui.QPainter(self._image)

        painter.fillRect(

            (col + self.border) * self.box_size,

            (row + self.border) * self.box_size,

            self.box_size, self.box_size,

            QtCore.Qt.black)

    def save(self, stream, kind=None):

        pass

class FileTransferWidget(QWidget):

    def __init__(self, url, color):

        QWidget.__init__(self)

        file_path = os.path.expanduser(url)

        self.file_name_font = QFont()

        self.file_name_font.setPointSize(24)

        self.file_name_label = QLabel(self)

        self.file_name_label.setText(file_path)

        self.file_name_label.setFont(self.file_name_font)

        self.file_name_label.setAlignment(Qt.AlignCenter)

        self.qrcode_label = QLabel(self)

        self.notify_font = QFont()

        self.notify_font.setPointSize(12)

        self.notify_label = QLabel(self)

        self.notify_label.setText("Scan above QR and open link by browser to start downloading.\nMake sure that your smartphone is connected to the same WiFi network as this computer.")

        self.notify_label.setFont(self.notify_font)

        self.notify_label.setAlignment(Qt.AlignCenter)

        layout = QVBoxLayout(self)

        layout.setContentsMargins(0, 0, 0, 0)

        layout.addStretch()

        layout.addWidget(self.qrcode_label, 0, Qt.AlignCenter)

        layout.addSpacing(20)

        layout.addWidget(self.file_name_label, 0, Qt.AlignCenter)

        layout.addSpacing(40)

        layout.addWidget(self.notify_label, 0, Qt.AlignCenter)

        layout.addStretch()

        self.start_server(file_path)

    def set_address(self, address):

        self.qrcode_label.setPixmap(qrcode.make(address, image_factory=Image).pixmap())

    def get_local_ip(self):

        try:

            s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

            s.connect(("8.8.8.8", 80))

            return s.getsockname()[0]

        except OSError:

            print("Network is unreachable")

            sys.exit()

    def get_free_port(self):

        """

        Determines a free port using sockets.

        """

        free_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

        free_socket.bind(('0.0.0.0', 0))

        free_socket.listen(5)

        port = free_socket.getsockname()[1]

        free_socket.close()

        return port

    def start_server(self, filename):

        global local_file_path

        local_file_path = filename

        self.port = self.get_free_port()

        self.local_ip = self.get_local_ip()

        self.set_address("http://{0}:{1}/{2}".format(self.local_ip, self.port, filename))

        t = threading.Thread(target=self.run_http_server, name='LoopThread')

        t.start()

    def run_http_server(self):

        httpd = BaseHTTPServer.HTTPServer(('', self.port), SimpleHTTPRequestHandler)

        httpd.serve_forever()

if __name__ == "__main__":

    from PyQt5.QtWidgets import QApplication

    import sys

    import signal

    app = QApplication(sys.argv)

    test = FileTransferWidget("/home/andy/rms/1.jpg", QColor(0, 0, 0, 255))

    test.show()

    signal.signal(signal.SIGINT, signal.SIG_DFL)

    sys.exit(app.exec_())