78 lines of Python code to help you reproduce WeChat message withdrawal!

Python once said to me: "Time is running out, hurry up and use Python." So I saw an open source WeChat library based on Python: itchat. I played with it for a day and made a program that can collect the withdrawn private chat information and send it to the file transfer assistant of personal WeChat, including:

• who ：who sent it
• when: when the message is sent
• what: what information
• which: which type of information, including: text, pictures, voice, video, sharing, location, attachments...

01 Code Implementation

 # -*-encoding:utf-8-*-
 import os
 import re
 import shutil
 import time  
 import itchat
 from itchat.content import * 
 
 # Note: Text, voice, video, picture, location, business card, share, and attachment can be withdrawn 
 
 # {msg_id:(msg_from,msg_to,msg_time,msg_time_rec,msg_type,msg_content,msg_share_url)}
 msg_dict = {} 
 
 # Temporary directory for file storage
 rev_tmp_dir = "/home/alic/RevDir/"  
 if not os.path.exists(rev_tmp_dir): os.mkdir(rev_tmp_dir) 
 
 # There is a problem with the expression | The msg_id of receiving the message and receiving the note are inconsistent. Coincidental solution
 face_bug = None 
 
 # Store the received messages in the dictionary. When a new message is received, clear the timed messages in the dictionary. | Do not accept messages that do not have the recall function. 
 
 # [TEXT, PICTURE, MAP, CARD, SHARING, RECORDING, ATTACHMENT, VIDEO, FRIENDS, NOTE]
 @itchat.msg_register([TEXT, PICTURE, MAP, CARD, SHARING, RECORDING, ATTACHMENT, VIDEO])
 def handler_receive_msg(msg):
 global face_bug
 # Get the local timestamp and format the local timestamp e: 2017-04-21 21:30:08
    msg_time_rec = time .strftime( "%Y-%m-%d %H:%M:%S" , time .localtime())
 # Message ID
 msg_id = msg[ 'MsgId' ]
 # Message time
    msg_time = msg[ 'CreateTime' ]
 # Nickname of the message sender | You can also use RemarkName here, but for yourself or someone without a remark, it is None
    msg_from = (itchat.search_friends(userName=msg[ 'FromUserName' ]))[ "NickName" ]
 # Message content
 msg_content = None
 # Shared link
 msg_share_url = None
    if msg[ 'Type' ] == 'Text' \
 or msg[ 'Type' ] == 'Friends' :
        msg_content = msg[ 'Text' ]
    elif msg[ 'Type' ] == 'Recording' \
 or msg[ 'Type' ] == 'Attachment' \
 or msg[ 'Type' ] == 'Video' \
 or msg[ 'Type' ] == 'Picture' :
        msg_content = r "" + msg[ 'FileName' ]
 # Save the file
        msg[ 'Text' ](rev_tmp_dir + msg[ 'FileName' ])
    elif msg[ 'Type' ] == 'Card' :
 msg_content = msg[ 'RecommendInfo' ][ 'NickName' ] + r "Business card"  
    elif msg[ 'Type' ] == 'Map' :
        x, y, location = re.search(
 "<location x=\"(.*?)\" y=\"(.*?)\".*label=\"(.*?)\".*" , msg[ 'OriContent' ]). group (1, 2, 3)
 if location is None:
 msg_content = r "latitude->" + x.__str__() + "longitude->" + y.__str__()
 else :
            msg_content = r "" + location
    elif msg[ 'Type' ] == 'Sharing' :
        msg_content = msg[ 'Text' ]
        msg_share_url = msg[ 'Url' ]
 face_bug = msg_content
 # Update dictionary
 msg_dict.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
 }
 }
 ) 
 
 # Receive note notification messages, determine whether to withdraw and perform corresponding operations 
 
 @itchat.msg_register([NOTE])
 def send_msg_helper(msg):
 global face_bug
 if re.search(r "\<\!\[CDATA\[.*Retracted a message\]\]\>" , msg[ 'Content' ]) is   not None:
 # Get the message id
        old_msg_id = re.search( "\<msgid\>(.*?)\<\/msgid\>" , msg[ 'Content' ]). group (1)
        old_msg = msg_dict.get(old_msg_id, {})
        if len(old_msg_id) < 11:
            itchat.send_file(rev_tmp_dir + face_bug, toUserName= 'filehelper' )
            os.remove(rev_tmp_dir + face_bug)
 else :
 msg_body = "Tell you a secret~" + "\n" \
 + old_msg.get( 'msg_from' ) + "Withdrawn" + old_msg.get( "msg_type" ) + "Message" + "\n" \
                       + old_msg.get( 'msg_time_rec' ) + "\n" \
 + "What was withdrawn ⇣" + "\n" \
                       + r "" + old_msg.get( 'msg_content' )
 # If the link exists,
 if old_msg[ 'msg_type' ] == "Sharing" : msg_body += "\nThis is the link ➣ " + old_msg.get( 'msg_share_url' ) 
 
 # Send the recall message to the file assistant
            itchat.send(msg_body, toUserName= 'filehelper' )
 # If there is a file, send it back
            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 = '@fil@%s' % (rev_tmp_dir + old_msg[ 'msg_content' ])
                itchat.send(msg=file, toUserName= 'filehelper' )
                os.remove(rev_tmp_dir + old_msg[ 'msg_content' ])
 # Delete old dictionary messages
            msg_dict.pop(old_msg_id) 
 
 if __name__ == '__main__' :
    itchat.auto_login(hotReload= True ,enableCmdQR=2)
 itchat.run()

The program can be run directly in the terminal. You can log in successfully by scanning the code in the terminal. It can also be packaged and run in the window system (note to modify the path, it is recommended to use a relative path).

 ➜ ~ python wx.py
 Getting uuid of QR code.
 Downloading QR code.
 Please scan the QR code to log in .
 Please press confirm on your phone.
 Loading the contact, this may take a little while.
 �[3;J
 Login successfully as AlicFeng
 Start auto replying.

02 Rendering

03 itchat

The above are all trivial things in programming logic. I will still record the itchat WeChat open source library.

1. Introduction

itchat is an open source WeChat personal account interface. It is very simple to call WeChat using Python. It is easy to use itchat code to build an instant messaging based on WeChat. What is more, it is convenient to expand the communication functions of personal WeChat on other platforms.

2. Installation

pip3 install itchat

3. itchat - Helloworld

Just three lines of code to send a message to the file transfer assistant.

 import itchat
 itchat.auto_login(hotReload= True )
 itchat.send( 'Hello AlicFeng' , toUserName= 'filehelper' )

4. View the client

[[237838]]

The most important thing to learn is the API manual:

Github for itchat:

• https://github.com/liduanwei/ItChat

Chinese API:

• http://itchat.readthedocs.io/zh/latest/