公式LINEアカウントにChatGPTによる返信機能を付ける！

heroku login
heroku create アプリ名

pip install openai
pip install line-bot-sdk
pip install flask
pip install gunicorn

pip freeze > requirements.txt

heroku config:set YOUR_OPENAI_API="YOUR_OPENAI_APIの文字列" --app アプリ名
heroku config:set YOUR_CHANNEL_SECRET="Channel Secretの文字列" --app アプリ名
heroku config:set YOUR_CHANNEL_ACCESS_TOKEN="アクセストークンの文字列" --app アプリ名

heroku config --app アプリ名

# decompress a file
tar -xzvf ngrok-v3-stable-linux-amd64.tgz

# Connect your account
ngrok config add-authtoken YOUR_TOKEN

# To start a HTTP tunnel forwarding to your local port 5000, run this next
ngrok http 5000

web: gunicorn app:app --log-file=-

from flask import Flask, request, abort
import openai
import os

from linebot import (
    LineBotApi, WebhookHandler
)
from linebot.exceptions import (
    InvalidSignatureError
)
from linebot.models import (
    MessageEvent, TextMessage, TextSendMessage,
)

app = Flask(__name__)

#環境変数取得
openai.api_key = os.environ["YOUR_OPENAI_API"]
YOUR_CHANNEL_ACCESS_TOKEN = os.environ["YOUR_CHANNEL_ACCESS_TOKEN"]
YOUR_CHANNEL_SECRET = os.environ["YOUR_CHANNEL_SECRET"]
line_bot_api = LineBotApi(YOUR_CHANNEL_ACCESS_TOKEN)
handler = WebhookHandler(YOUR_CHANNEL_SECRET)

@app.route("/")
def hello_world():
    return "hello world!"

@app.route("/callback", methods=['POST'])
def callback():
    # 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:
        handler.handle(body, signature)
    except InvalidSignatureError:
        abort(400)

    return 'OK'

@handler.add(MessageEvent, message=TextMessage)
def handle_message(event):
    # ユーザーからのメッセージを取得
    user_message = event.message.text

    # OpenAIのGPT-4を使ってユーザーからのメッセージに返答を生成
    response = openai.ChatCompletion.create(
        model="gpt-4", 
        messages=[
            {"role": "system", "content": "You are a helpful assistant."},
            {"role": "user", "content": user_message},
        ],
    )

    # OpenAIからの返答を取得
    gpt_response = response['choices'][0]['message']['content']

    # メッセージを返送
    line_bot_api.reply_message(
        event.reply_token,
        TextSendMessage(text=gpt_response))

if __name__ == "__main__":
#    app.run()
    port = int(os.getenv("PORT"))
    app.run(host="0.0.0.0", port=port)

git init
git add .
git commit -m "commit comments"
git push heroku master