server.js

/*
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

require('dotenv').config();

const express = require('express');
const app = express();
const {actions, audit} = require('./bot.js');

app.use(express.json());

const { createProbot } = require("probot");
const approvals = require("./approvals/app");
const probot = createProbot();

app.post('/approvals', async function(request, response) {
  await probot.load(approvals);
  probot.webhooks.receive({
    name: request.headers['x-github-event'],
    payload: request.body
  });
  response.send(200);
});

// Listen for issue_comment [1] and pull_request [2] events.
// [1] https://docs.github.com/en/developers/webhooks-and-events/webhook-events-and-payloads#issue_comment
// [2] https://docs.github.com/en/developers/webhooks-and-events/webhook-events-and-payloads#pull_request
app.post('/', function(request, response) {
  const data = request.body;
  // This is the key routing logic. Essentially, we
  // just pass the event to bot.js via the `actions` handler.
  // Each key of `actions` is one of the event names that GitHub
  // uses to indicate different types of events. If we don't
  // have a function defined for that key then we ignore the webhook event.
  const action = data.action;
  if (!actions.hasOwnProperty(action)) {
    response.end();
    return;
  }
  actions[action](data);
  response.end();
});

if (process.env.DEV) {
  app.get('/', async (request, response) => {
    const {ORG, REPO, PR} = process.env;
    if (!ORG || !REPO || !PR) {
      throw new Error(`set ORG, REPO and PR in env`);
    }
    // Manually pass the PR that you want to test as the argument to audit().
    const data = await audit(ORG, REPO, PR);
    response.header('Content-Type', 'application/json');
    response.send(JSON.stringify(data, null, 2));
  });
}

const listener = app.listen(process.env.PORT, () => {
  console.log('reviewbot running on', listener.address());
});