Make Echolalia LINEbot with Python + heroku

Introduction

This time I'm going to create an Echolalia bot using Python and heroku. This article is for people who have a good environment for python3 and homebrew. If you don't have an environment yet https://ai-inter1.com/python-install/ https://qiita.com/balius_1064/items/ac7dff5ef10eaf69996f Please refer to the article etc.

Development environment

• Python 3.7.3
• flask
• heroku
• macos 10.15.4

LINE Developers settings

First, log in to LINE Developers with your LINE account.

When you log in, the Developers account registration screen will be displayed. --Developer name

• mail address Please enter and create.

When account registration is completed

A page like this will appear, click Create New Provider. When you enter the provider name

Is displayed, select the Messaging API. When this screen is displayed, --Channel name --Channel description --Large industries --Small industry

• mail address Please enter and create. Once created, you'll be taken to the Channel Preferences page, where you can go to the Messaging API settings next to it, disable greeting and response messages, and turn on webhooks. This completes the LINEbot account setup. Read the displayed QR code on your LINE and add friends.

installation of line-bot-sdk and flask

pip install flask
pip install line-bot-sdk

Do the above two to line-bot-sdk and flask /) Install.

mkdir line-bot
cd line-bot

Then open a terminal, create a directory for linebot and change to that directory.

Create a configuration file

runtime.txt

python-3.7.3

requirements.txt

Flask==1.1.1
line-bot-sdk==1.8.0

Procfile

web: python main.py

--runtime.txt ・ ・ ・ Describe the Python version --requirements.txt ・ ・ ・ Describe the library to be installed --Procfile ・ ・ ・ Describes how to execute the program

If you can set up so far, it is time to create a python program.

main.py

#Library import
from flask import Flask, request, abort
from linebot import (
    LineBotApi, WebhookHandler
)
from linebot.exceptions import (
    InvalidSignatureError
)
from linebot.models import (
    FollowEvent, MessageEvent, TextMessage, TextSendMessage, ImageMessage, ImageSendMessage, TemplateSendMessage, ButtonsTemplate, PostbackTemplateAction, MessageTemplateAction, URITemplateAction
)
import os
#Lightweight web application framework:Flask
app = Flask(__name__)

#LINE Acces Token
LINE_CHANNEL_ACCESS_TOKEN = "LINE_CHANNEL_ACCESS_TOKEN"
#LINE Channel Secret
LINE_CHANNEL_SECRET = "LINE_CHANNEL_SECRET"

line_bot_api = LineBotApi(LINE_CHANNEL_ACCESS_TOKEN)
handler = WebhookHandler(LINE_CHANNEL_SECRET)

@app.route("/callback", methods=['POST'])
def callback():
    signature = request.headers['X-Line-Signature']

    body = request.get_data(as_text=True)
    app.logger.info("Request body: " + body)

    try:
        handler.handle(body, signature)
    except InvalidSignatureError:
        abort(400)

    return 'OK'

@handler.add(MessageEvent, message=TextMessage)
def handle_message(event):
	line_bot_api.reply_message(
        event.reply_token,
        TextSendMessage(text=event.message.text )
     )

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

Create main.py like this.

#LINE Acces Token
LINE_CHANNEL_ACCESS_TOKEN = "LINE_CHANNEL_ACCESS_TOKEN"
#LINE Channel Secret
LINE_CHANNEL_SECRET = "LINE_CHANNEL_SECRET"

For the LINE Acces Token and LINE Channel Secret part, go to the LINE bot channel setting page that you created first, check your own, and copy and paste.

Heroku settings

First, register on Heroku. (It was hard for me who is not good at English) After registration is complete, click create new app to create the app. The app name you enter at this time should not be shared with other people's, so please think carefully. After creating the app, enter the url written in Domains of Setting with / callback in the webhook setting of LINE Messaging API.

Then at the terminal

brew install heroku

Please run the. Next, configure the settings to push to heroku.

heroku login

And press the enter key to launch the browser. Therefore, please log in by entering the email address and password you registered earlier.

Logged in as [Registered email address]

Is displayed, it is successful.

git init

heroku git:remote -a (app name)

git add .

git commit -m "first commit"

git push heroku master

Deploying is completed by executing the above commands in order. At heroku's Activity If Build succeeded is displayed, it is successful.

Setting environment variables

heroku config:set LINE_CHANNEL_ACCESS_TOKEN=XXXXXXXXXXXXXXXXXXXXXXXXX

heroku config:set LINE_CHANNEL_SECRET=XXXXXXXXXXXXXXXXXXXXX

Next, execute the above two in the terminal to set the environment variables. This is the same as the LINE Acces Token and LINE Channel Secret you entered in main.py earlier, so copy and execute it.

Complete

Let's send appropriate characters to the bot you added earlier with your LINE app! If you get the same content as the characters you sent, you are successful.

If you can read it but it doesn't work, go to the terminal

heroku logs --tail

If you enter, you can see the log in real time, so please investigate the cause there. (Often the LINE messaging API has disabled webhooks)

Summary

This time, I created a LINEbot that will give you back, but you can improve this source code and create your own LINEbot! Also, Rich Menu and LIFF App It is also possible to create a more luxurious LINE bot by adding liff / developing-liff-apps /). Please try that too!

reference

https://developers.line.biz/ja/docs/messaging-api/ https://github.com/line/line-bot-sdk-python