DjangoでherokuにデプロイしEvents API(slack)のVerificationを通す ref: https://qiita.com/Ningensei848/items/c83c2d8e3f11ebba1fd4

bash

(myvenv) $ heroku config:set SLACK_BOT_USER_TOKEN="xoxb-111122223333-iEUserT0kenhHfM53HtxHSl0" \
                             SLACK_CLIENT_SECRET="40ji7secreta665294secrete97y3r7O" \
                             SLACK_VERIFICATION_TOKEN="verificationgedXbv9gehow" \
                             SLACK_CLIENT_ID="212341111111.287651111111"
(myvenv) $ heroku config

'''
SLACK_BOT_USER_TOKEN:       "xoxb-111122223333-iEUserT0kenhHfM53HtxHSl0"
SLACK_CLIENT_SECRET:        "40ji7secreta665294secrete97y$r7O"
SLACK_VERIFICATION_TOKEN:   "verificationgedXbv9gehow"
SLACK_CLIENT_ID:            "212341111111.287651111111"
'''

Django-Project-Directory

mysite
├── manage.py
└── mysite
    ├── __init__.py
    ├── settings.py
    ├── urls.py
    └── wsgi.py

local_settings.py

import os
BASE_DIR = os.path.dirname(os.path.dirname(__file__))

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}

DEBUG = True

Procfile

web: gunicorn mysite.wsgi

runtime.txt

python-3.6.4

settings.py

/ ~~~~~~~~~~~~~~~~~~  中略 ~~~~~~~~~~~~~~~~~~~~ /
import dj_database_url
DATABASES['default'] = dj_database_url.config()

SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')

ALLOWED_HOSTS = ['*']

STATIC_ROOT = 'staticfiles'

DEBUG = False

try:
    from .local_settings import *
except ImportError:
    pass                         # <= ここが最終行です

urls.py

from django.contrib import admin
from django.urls import path, include
from tool_manage.views import Events

from django.views.decorators.csrf import csrf_exempt

urlpatterns = [
    path('', include('tool_manage.urls')),           # <= add
    path('admin/', admin.site.urls),                 # <= default
    path('events/', csrf_exempt(Events.as_view())),  # <= add
    # csrf無効についての参考：https://bit.ly/2juuJpa
]

views.py

import json

from django.conf import settings
from django.shortcuts import render
from django.http import HttpResponse

from rest_framework.response import Response
from rest_framework.views import APIView
from rest_framework import status

from slackclient import SlackClient


SLACK_VERIFICATION_TOKEN = getattr(settings, 'SLACK_VERIFICATION_TOKEN', None)
SLACK_BOT_USER_TOKEN = getattr(settings,'SLACK_BOT_USER_TOKEN', None)
Client = SlackClient(SLACK_BOT_USER_TOKEN)


class Events(APIView):

    def post(self, request, *args, **kwargs):
        slack_message = request.data

        # verification challenge
        if slack_message.get('type') == 'url_verification':
            return Response(data=slack_message,
                            status=status.HTTP_200_OK)

########################### Pages ###################################
def index(request):
    # index.html
    return HttpResponse('インデックスページ')

wsgi.py

from whitenoise.django import DjangoWhiteNoise
application = DjangoWhiteNoise(application)