如何使用Python实现微信中找回好友、群聊用户撤回的消息功能

#coding=utf-8
import itchat
from itchat.content import TEXT
from itchat.content import *
import sys
import time
import re
import os
msg_information = {}
face_bug=None #针对表情包的内容
@itchat.msg_register([TEXT,PICTURE,FRIENDS,CARD,MAP,SHARING,RECORDING,ATTACHMENT,VIDEO],isFriendChat=True,isGroupChat=True)
def receive_msg(msg):
  global face_bug
  msg_time_rec = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()) #接收消息的时间
  if 'ActualNickName' in msg:
    from_user = msg['ActualUserName'] #群消息的发送者,用户的唯一标识
    msg_from = msg['ActualNickName']#发送者群内的昵称
    friends = itchat.get_friends(update=True)#获取所有好友
    for f in friends:
      if from_user == f['UserName']: #如果群消息是好友发的
        if f['RemarkName']: # 优先使用好友的备注名称，没有则使用昵称
          msg_from = f['RemarkName']
        else:
          msg_from = f['NickName']
        break
    groups = itchat.get_chatrooms(update=True)#获取所有的群
    for g in groups:
      if msg['FromUserName'] == g['UserName']:#根据群消息的FromUserName匹配是哪个群
        group_name = g['NickName']
        group_menbers = g['MemberCount']
        break
    group_name = group_name + "(" + str(group_menbers) +")"
  else:
    if itchat.search_friends(userName=msg['FromUserName'])['RemarkName']:#优先使用备注名称
      msg_from = itchat.search_friends(userName=msg['FromUserName'])['RemarkName']
    else:
      msg_from = itchat.search_friends(userName=msg['FromUserName'])['NickName'] #在好友列表中查询发送信息的好友昵称
    group_name = ""
  msg_time = msg['CreateTime'] #信息发送的时间
  msg_id = msg['MsgId']  #每条信息的id
  msg_content = None   #储存信息的内容
  msg_share_url = None  #储存分享的链接，比如分享的文章和音乐
  if msg['Type'] == 'Text' or msg['Type'] == 'Friends':   #如果发送的消息是文本或者好友推荐
    msg_content = msg['Text']
  #如果发送的消息是附件、视频、图片、语音
  elif msg['Type'] == "Attachment" or msg['Type'] == "Video" \
      or msg['Type'] == 'Picture' \
      or msg['Type'] == 'Recording':
    msg_content = msg['FileName']  #内容就是他们的文件名
    msg['Text'](str(msg_content))  #下载文件
  elif msg['Type'] == 'Map':  #如果消息为分享的位置信息
    x, y, location = re.search(
      "<location x=\"(.*?)\" y=\"(.*?)\".*label=\"(.*?)\".*", msg['OriContent']).group(1, 2, 3)
    if location is None:
      msg_content = r"纬度->" + x.__str__() + " 经度->" + y.__str__()   #内容为详细的地址
    else:
      msg_content = r"" + location
  elif msg['Type'] == 'Sharing':   #如果消息为分享的音乐或者文章，详细的内容为文章的标题或者是分享的名字
    msg_content = msg['Text']
    msg_share_url = msg['Url']    #记录分享的url
  face_bug = msg_content
  #将信息存储在字典中，每一个msg_id对应一条信息
  time.sleep(2)
  msg_information.update(
    {
      msg_id: {
        "msg_from": msg_from,
        "msg_time": msg_time,
        "msg_time_rec": msg_time_rec,
        "msg_type": msg["Type"],
        "msg_content": msg_content,
        "msg_share_url": msg_share_url,
        "group_name":group_name
      }
    }
  )
  del_info = []
  for k in msg_information:
    m_time = msg_information[k]['msg_time'] #取得消息时间
    if int(time.time()) - m_time > 130: #如果消息时间是130秒甚至更久之前的，则删除。
      del_info.append(k)
  if del_info:
    for i in del_info:
      msg_information.pop(i)
#监听是否有消息撤回
@itchat.msg_register(NOTE,isFriendChat=True,isGroupChat=True,isMpChat=True)
def information(msg):
  #如果这里的msg['Content']中包含消息撤回和id，就执行下面的语句
  if '撤回了一条消息' in msg['Content']:
    old_msg_id = re.search("\<msgid\>(.*?)\<\/msgid\>", msg['Content']).group(1) #在返回的content查找撤回的消息的id
    old_msg = msg_information.get(old_msg_id)  #获取到消息原文,类型：字典
    print(old_msg)
    if len(old_msg_id)<11: #如果发送的是表情包
      itchat.send_file(face_bug,toUserName='filehelper')
    else: #发送撤回的提示给文件助手
      msg_body = old_msg['group_name'] + old_msg['msg_from'] +"\n" + old_msg['msg_time_rec'] \
            + "撤回了:" + "\n" + r"" + old_msg['msg_content']
      #如果是分享的文件被撤回了，那么就将分享的url加在msg_body中发送给文件助手
      if old_msg['msg_type'] == "Sharing":
        msg_body += "\n链接是:" + old_msg.get('msg_share_url')
      #print(msg_body)
      itchat.send_msg(msg_body, toUserName='filehelper')#将撤回消息发给文件助手
      #有文件的话也要将文件发送回去
      if old_msg["msg_type"] == "Picture" \
          or old_msg["msg_type"] == "Recording" \
          or old_msg["msg_type"] == "Video" \
          or old_msg["msg_type"] == "Attachment":
        file = '%s' % (old_msg['msg_content'])
        itchat.send(msg=file, toUserName='filehelper')
        os.remove(old_msg['msg_content'])
      msg_information.pop(old_msg_id)# 删除字典旧消息
itchat.auto_login(hotReload=True,enableCmdQR=1)
itchat.run()