views.py

import os
import json
import github3
import logging
from django.http import HttpResponse
from django.views.decorators.csrf import csrf_exempt

gh = github3.login(token=os.environ['GITHUB_TOKEN'])
log = logging.getLogger(__name__)

@csrf_exempt
def webhook(request):
    payload = json.loads(request.body)
    event = request.META['HTTP_X_GITHUB_EVENT']
    log.info('at=webhook event=%s', event)

    if event == 'pull_request':
        if payload['action'] == 'opened':
            repo_name = payload['pull_request']['head']['repo']['full_name']
            log.info('at=webhook pr-opened repo=%s', repo_name)
    
            repo = gh.repository(*repo_name.split('/'))
            repo.create_status(
                sha = payload['pull_request']['head']['sha'], 
                state = 'error', 
                description = 'requires change control approval')
            log.info('at=webhook pr-opened repo=%s status=approval-required', repo_name)
    
    elif event == 'issue_comment':
        if '+1' in payload['comment']['body'].strip():
            repo_name = payload['repository']['full_name']
            pr_number = payload['issue']['number']
            log.info('at=webhook issue_comment repo=%s pr=%s', repo_name, pr_number)

            repo = gh.repository(*repo_name.split('/'))
            pr = repo.pull_request(pr_number)
            repo.create_status(
                sha = pr.head.sha,
                state = 'success',
                description = 'change approved',
            )
            log.info('at=webhook issue)comment repo=%s status=approved', repo_name)

    return HttpResponse('')