main.py

from fastapi import FastAPI, Request, BackgroundTasks, Header
from linebot import LineBotApi, WebhookHandler
from linebot.exceptions import InvalidSignatureError
from linebot.models import MessageEvent, TextMessage
from starlette.exceptions import HTTPException
import os
 
app = FastAPI()
# line_bot_api = LineBotApi(os.environ["LINE_CHANNEL_ACCESS_TOKEN"])
# handler = WebhookHandler(os.environ["LINE_CHANNEL_SECRET"])
line_bot_api = LineBotApi("ZwnEWwK46AUmRDOFXJOwUh1TqAELahP+kxHY0iBevF8JiEUe0CBQpkW2Gpo3C38LOaIX7hpW4IuTOSOjVof+DX9XgZg8MTeh5Iz+NDLlw6KKMtqNsyR6zt9CMnsso21ieifC/S8dcgXx3iKlhdS7UAdB04t89/1O/w1cDnyilFU=")
handler = WebhookHandler("7b9984bbc5c62445a79b95b15e34b727")

@app.get("/")
def root():
    return {"title": "Echo Bot"}
     
@app.post("/callback")
async def callback(
    request: Request,
):
    # get X-Line-Signature header value
    signature = request.headers['X-Line-Signature']
    # get request body as text
    body = request.get_data(as_text=True)
    app.logger.info("Request body: " + body)
    # handle webhook body
    try:
        line_handler.handle(body, signature)
    except InvalidSignatureError:
        abort(400)
    return 'OK'
 
@line_handler.add(MessageEvent, message=TextMessage)
def handle_message(event):
    global working_status
    if event.message.text == "再見":
        working_status = True
        line_bot_api.reply_message(
            event.reply_token,
            TextSendMessage(text="Bye!"))
        return

    if working_status:

        out = event.message.text
        if not out:
            out = "不懂您的意思!"
        line_bot_api.reply_message(
            event.reply_token,
            TextSendMessage(text=out))