line_notify_register.py

from bottle import route, run, template, request
import urllib.parse
import requests

CLIENT_ID = 'client_id'
CLIENT_SECRET = 'client_secret'
REDIRECT_URI = 'http://localhost:5555/oauth_line'

@route('/')
def index():
    line_url = 'https://notify-bot.line.me/oauth/authorize'
    params = {
        'client_id': CLIENT_ID,
        'response_type': 'code',
        'state': 42,
        'scope': 'notify',
        'redirect_uri': REDIRECT_URI
    }
    url = line_url + '?' + urllib.parse.urlencode(params)
    return template('<a href="%s">Click here to login with LINE</a>' % url)

@route('/oauth_line')
def oauth_line():
    code = request.query['code']
    r = requests.post(
       'https://notify-bot.line.me/oauth/token',
        data={
            'client_id': CLIENT_ID,
            'client_secret': CLIENT_SECRET,
            'code': code,
            'grant_type': 'authorization_code',
            'redirect_uri': REDIRECT_URI
        }
    )
    res = r.json()
    access_token = res['access_token'] # Now, save this token!
    
    r = requests.post(
        'https://notify-api.line.me/api/notify',
        data={
            'message': 'Welcome!'
        },
        headers={
            'Authorization': 'Bearer ' + access_token
        }
    )

run(host='localhost', port=5555)