How to Integrate GitHub PRs with Bamboo CI

'use strict';
 
// source code for AWS Lambda function
// Runs https://api.ci.EXAMPLE.com/buildplan/{bamboo_planKey}/githubevent
// This notifies Bamboo of new pushes and pull requests
 
const https = require('https');
 
exports.handler = (event, context, callback) => {
 
    const done = (status, body) => callback(null, {
        statusCode: status,
        body: JSON.stringify(body),
        headers: {
            'Content-Type': 'application/json',
        },
    });
 
    if (event.queryStringParameters["api-key"] !== '999999999999999999999999') {
      done(403, "Unauthorized: missing or invalid api-key.");
      return;
    }
 
    var body = JSON.parse(event.body);
 
    /************* Process Push events *************/
    if (event.headers["X-GitHub-Event"] === "push") {
        var options = {
            hostname: 'ci.EXAMPLE.com',
            path: "/rest/triggers/1.0/remote/changeDetection" +
                "?planKey=" + encodeURIComponent(event.pathParameters.bamboo_planKey) +
                "&skipBranches=false",
            headers: {
                "X-Atlassian-Token": "no-check",
                "Content-Type": "application/json"
            },
            method: 'POST'
        };
 
        var req = https.request(options, (response) => {
            response.on('data', (chunk) => {
                done(response.statusCode, chunk.toString());
            })
        });
        req.on('error', (e) => { done(500, e); });
        req.end();
        return;
 
    }
 
    /************* Process PR events *************/
    if (event.headers["X-GitHub-Event"] === "pull_request"
        && (body.action === "opened" || body.action === "reopened")) {
 
        var pr = body.number;
        var pr_branch = body.pull_request.head.ref;
        var plan_key = event.pathParameters.bamboo_planKey;
        options = {
            method: 'put',
            host: process.env.bamboo_url,
            path: '/rest/api/latest/plan/' + plan_key + '/branch/' + pr_branch + '.json?vcsBranch=' + pr_branch,
            auth: process.env.bamboo_user + ':' + process.env.bamboo_pass,
            options: {
                'vscBranch': '/refs/heads/' + pr_branch,
                'os_authType': 'basic'
            }
        };
 
        req = https.request(options, (response) => {
            response.on('data', (chunk) => {
                done(response.statusCode, JSON.parse(chunk.toString()));
            });
        });
        req.on('error', (e) => { done(500, e); });
        req.end();
        return;
    }
 
    /************* Catch-all *************/
    done(200, "ok. Nothing to do.");
    return;
};