Use selenium to read messages from the "line" messaging app as an extension of chrome.

line-sel.py

# This is an experimental piece of code for reading messages
# from the "line" messaging app as an extension of chrome.
# https://chrome.google.com/webstore/detail/line/ophjlpahpchlmihnnnihgmmeilfjmjjc?hl=zh-TW
# My linux is LMDE 5 (elsie), and my chromium is 113.0.5672.63,
# directly installed with apt install.
# I have also done:
# pip3 install selenium webdriver-manager beautifulsoup4
# To use this program:
# 0. Create a line account if you don't have one.
#    Note: Line is control-hungry.
#    It insists on binding to your one and only phone.
#    Every time you create a new selenium session,
#    you have to install the line extension yet again,
#    and line requires you to authenticate that installation by phone.
#    Therefore it's easier to stay in the python interpreter,
#    attached to the same selenium session all the time.
# 1. Enter python3 interpreter.
# 2. exec(open('line-sel.py').read()) # a chromium window will be opened
# 3. Install line into the chromium window and log in.
# 4. Come back to the python interpreter and begin from
#    init_line_handle()
#    towards the end of this program.

import selenium
from time import sleep
from bs4 import BeautifulSoup
from selenium import webdriver
from selenium.webdriver.chrome.service import Service
from webdriver_manager.chrome import ChromeDriverManager

chrome_options = webdriver.ChromeOptions()
# chrome_options.add_extension('tutorial.hello-world.crx')

prefs = {"profile.default_content_setting_values.notifications" : 2}
chrome_options.add_experimental_option("prefs",prefs)
driver = webdriver.Chrome(options=chrome_options)  
driver = webdriver.Chrome(service=Service(ChromeDriverManager().install()))
driver.get("https://www.google.com")
driver.set_window_size(800,600)

def init_line_handle():
    global all_tabs, line_handle
    all_tabs = {}
    for handle in driver.window_handles:
        driver.switch_to.window(handle)
        all_tabs[driver.title] = handle
    line_handle = all_tabs['LINE']
    driver.switch_to.window(line_handle)

def print_all_msg(chat):
    msg_list = current_chat.find_all(recursive=False)
    for msg in msg_list:
        time_stamp = msg.find('p', {'class': 'mdRGT07Date'})
        time_stamp = '-' if time_stamp is None else time_stamp.get_text().strip()
        print('{:<8} '.format(time_stamp), end=' ')
        msg_text = msg.find('div', {'class': 'mdRGT07MsgText'})
        msg_text = '' if msg_text is None else msg_text.get_text().strip()
        msg_class = msg.attrs['class']
        if 'MdRGT10Notice'in msg_class:
            print('[###]', msg.get_text())
        elif 'mdRGT07Own' in msg_class:
            print('*me*', msg_text)
        elif 'mdRGT07Other' in msg_class:
            speaker = msg.find('div', {'class': 'mdRGT07Ttl'})
            speaker = '???' if speaker is None else speaker.get_text().strip()
            print('[{}] '.format(speaker, msg_text))
        else:
            print('?????', msg_class)

# init_line_handle() 
### This only needs to be done once, after line login and
### before all other following operations

### The following needs to be done every time you switch
### to a different (friend- or group) chat.
# page_soup = BeautifulSoup(driver.page_source, 'html.parser')
# current_chat = page_soup.find(id='_chat_room_msg_list')


### print(current_chat.prettify())
# print_all_msg(current_chat)