#!/usr/bin/env python
# -*- coding: gbk -*-
# @Version : Python 3.5.2
# @Time : 2018/1/24 10:29
# @Author : Ncp
# @File : server.py
# @Software: PyCharm

import json
import time
import hashlib
import struct
import os
from socketserver import *

FILE_PATH = os.path.dirname(os.path.abspath(__file__))+'\\server_file'

class MYserver(BaseRequestHandler): # 设置一个类，基础BaseRequestHandler这个类
 def handle(self):     # 这个方法下添加通信功能（和上面创建类一样，这是socketserver的固定模式）
  print(self.client_address)
  '''
  :functions: 使用socketserver的并发套接字，提供客户端下载文件，并对文件进行MD5加密
  '''
  while True:
   try:
    data = self.request.recv(1024)
    data_recv = data.decode('gbk').split()
    if not os.path.exists(FILE_PATH+r'\%s' %data_recv[1]):
     self.request.send('file is not found'.encode('gbk'))
     continue
    else:
     data = self.request.send('1'.encode('gbk')) # 这里发现小问题，不回复一个信息的话，发送给客户端的包头居然成了没有封装
     FILE_SIZE = os.path.getsize(FILE_PATH+r'\%s' %data_recv[1])
     with open(FILE_PATH+r'\%s' %data_recv[1],'rb')as f:
      hash_file = f.read()
     m = hashlib.md5()
     m.update(hash_file)
     m_hex = m.hexdigest()
     file_header = {'filename':data_recv[1],
         'filesize':FILE_SIZE,
         'md5':m_hex,
         'time':time.strftime('%Y-%m-%d-%X',time.localtime())
         }
     # 包头信息序列化
     file_header_dump = json.dumps(file_header)
     # 编译成2进制
     file_header_bytes = file_header_dump.encode('gbk')
     # 封装报头
     file_header_struct = struct.pack('i',len(file_header_bytes))
     # 发送报头
     self.request.send(file_header_struct)
     # 发送报文内容
     self.request.send(file_header_bytes)
     # 发送文件数据
     send_size = 0
     with open(FILE_PATH+r'\%s' %data_recv[1] , 'rb')as f:
      for i in f:
       self.request.send(i)
       send_size += len(i) # 这里后续可以拓展一个进度或者网速显示功能
   except Exception:
    self.request.close()


if __name__ == '__main__':
 server = ThreadingTCPServer(('127.0.0.1',8080),MYserver) # windows下只能开启多线程
 server.serve_forever()

#!/usr/bin/env python
# -*- coding: gbk -*-
# @Version : Python 3.5.2
# @Time : 2018/1/24 10:29
# @Author : Ncp
# @File : client.py
# @Software: PyCharm

from socket import *
import os,sys
import hashlib
import struct
import math
import json

FILE_PATH = os.path.dirname(os.path.abspath(__file__))+'\\client_file'


# 显示下载进度条功能，可以拓展为显示下载速度（提示，因为每次传输4096个字节，那么下载网速为KB/S,1KB个字节=1024B（字节），那么1s传输了多少个字节呢？）
def progress(recvd, total):
 fraction = '{:.0%}'.format(recvd / total)
 sys.stdout.write('\r[%-30s] %s' % ('#' * int(math.floor(recvd * 30 / total)), fraction))
 sys.stdout.flush()
 if recvd == total:
  sys.stdout.write('\n')


# 主函数
def run(ip,addr):
 client = socket(AF_INET,SOCK_STREAM)
 client.connect((ip,addr))
 while True:
  user_input = input('').strip()
  cmd = user_input.split()
  if len(cmd) != 2:
   print('input format is error please use:get xx')
   continue
  if cmd[0] == 'get':
   client.send(user_input.encode('gbk'))
   data = client.recv(1024)
   data_recv = data.decode('gbk')
   if data_recv == 'file is not found':
    print(data_recv)
    continue
  else:
   print('commands is not found')
   continue
  # 收包头，然后一系列处理
  header = client.recv(4)
  if not header:break
  header_json_len = struct.unpack('i', header)[0]
  header_json_bytes = client.recv(header_json_len)
  header_josn = header_json_bytes.decode('gbk')
  header_dic = json.loads(header_josn)
  # 去除包头内容进行下载
  print(header_dic)
  data_len = header_dic['filesize']
  data_file = header_dic['filename']
  data_md5 = header_dic['md5']
  recv_size = 0
  with open(FILE_PATH+r'\%s' %data_file,'wb')as fw:
   while recv_size < data_len:
    recv_data = client.recv(4096)
    recv_size += len(recv_data)
    fw.write(recv_data)
    progress(recv_size,data_len)
   print('Download completion, start validation')
  # 收到文件后，读取文件进行加密，看是否与服务端下载的文件一致！
  with open(FILE_PATH+r'\%s' %data_file,'rb')as fr:
   data_total = fr.read()

  m = hashlib.md5()
  m.update(data_total)
  m_hex = m.hexdigest()

  if m_hex == data_md5:
   print('文件验证通过')
  else:
   print('文件损坏,删除文件')
   os.remove(FILE_PATH+r'\%s' %data_file)


if __name__ == '__main__':
 run('127.0.0.1',8080)