@cloudsnorkel/cdk-github-runners
Version:
CDK construct to create GitHub Actions self-hosted runners. Creates ephemeral runners on demand. Easy to deploy and highly customizable.
161 lines • 26.3 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.handler = handler;
const crypto = require("crypto");
const fs = require("fs");
const lambda_github_1 = require("./lambda-github");
const lambda_helpers_1 = require("./lambda-helpers");
const nonce = crypto.randomBytes(64).toString('hex');
function getHtml(baseUrl, token, domain) {
return fs.readFileSync('index.html', 'utf-8')
.replace(/INSERT_WEBHOOK_URL_HERE/g, process.env.WEBHOOK_URL)
.replace(/INSERT_BASE_URL_HERE/g, baseUrl)
.replace(/INSERT_TOKEN_HERE/g, token)
.replace(/INSERT_SECRET_ARN_HERE/g, process.env.SETUP_SECRET_ARN)
.replace(/INSERT_DOMAIN_HERE/g, domain)
.replace(/<script/g, `<script nonce="${nonce}"`)
.replace(/<style/g, `<style nonce="${nonce}"`);
}
function response(code, body) {
return {
statusCode: code,
headers: {
'Content-Type': 'text/html',
'Content-Security-Policy': `default-src 'unsafe-inline' 'nonce-${nonce}'; img-src data:; connect-src 'self'; form-action https:; frame-ancestors 'none'; object-src 'none'; base-uri 'self'`,
},
body: body,
};
}
async function handleRoot(event, setupToken) {
const stage = event.requestContext.stage == '$default' ? '' : `/${event.requestContext.stage}`;
const setupBaseUrl = `https://${event.requestContext.domainName}${stage}`;
const githubSecrets = await (0, lambda_helpers_1.getSecretJsonValue)(process.env.GITHUB_SECRET_ARN);
return response(200, getHtml(setupBaseUrl, setupToken, githubSecrets.domain));
}
function decodeBody(event) {
let body = event.body;
if (!body) {
throw new Error('No body found');
}
if (event.isBase64Encoded) {
body = Buffer.from(body, 'base64').toString('utf-8');
}
return JSON.parse(body);
}
async function handleDomain(event) {
const body = decodeBody(event);
if (!body.domain) {
return response(400, 'Invalid domain');
}
if (body.runnerLevel !== 'repo' && body.runnerLevel !== 'org') {
return response(400, 'Invalid runner registration level');
}
const githubSecrets = await (0, lambda_helpers_1.getSecretJsonValue)(process.env.GITHUB_SECRET_ARN);
githubSecrets.domain = body.domain;
githubSecrets.runnerLevel = body.runnerLevel;
await (0, lambda_helpers_1.updateSecretValue)(process.env.GITHUB_SECRET_ARN, JSON.stringify(githubSecrets));
return response(200, 'Domain set');
}
async function handlePat(event) {
const body = decodeBody(event);
if (!body.pat || !body.domain) {
return response(400, 'Invalid personal access token');
}
await (0, lambda_helpers_1.updateSecretValue)(process.env.GITHUB_SECRET_ARN, JSON.stringify({
domain: body.domain,
appId: -1,
personalAuthToken: body.pat,
runnerLevel: 'repo',
}));
await (0, lambda_helpers_1.updateSecretValue)(process.env.SETUP_SECRET_ARN, JSON.stringify({ token: '' }));
return response(200, 'Personal access token set');
}
async function handleNewApp(event) {
if (!event.queryStringParameters) {
return response(400, 'Invalid code');
}
const code = event.queryStringParameters.code;
if (!code) {
return response(400, 'Invalid code');
}
const githubSecrets = await (0, lambda_helpers_1.getSecretJsonValue)(process.env.GITHUB_SECRET_ARN);
const baseUrl = (0, lambda_github_1.baseUrlFromDomain)(githubSecrets.domain);
const { Octokit } = await (0, lambda_github_1.loadOctokitRest)();
const newApp = await new Octokit({ baseUrl }).rest.apps.createFromManifest({ code });
githubSecrets.appId = newApp.data.id;
githubSecrets.domain = new URL(newApp.data.html_url).host; // just in case it's different
githubSecrets.personalAuthToken = '';
// don't update runnerLevel as it was set by handleDomain() above
await (0, lambda_helpers_1.updateSecretValue)(process.env.GITHUB_SECRET_ARN, JSON.stringify(githubSecrets));
await (0, lambda_helpers_1.updateSecretValue)(process.env.GITHUB_PRIVATE_KEY_SECRET_ARN, newApp.data.pem);
await (0, lambda_helpers_1.updateSecretValue)(process.env.WEBHOOK_SECRET_ARN, JSON.stringify({
webhookSecret: newApp.data.webhook_secret,
}));
await (0, lambda_helpers_1.updateSecretValue)(process.env.SETUP_SECRET_ARN, JSON.stringify({ token: '' }));
return response(200, `New app set. <a href="${newApp.data.html_url}/installations/new">Install it</a> for your repositories.`);
}
async function handleExistingApp(event) {
const body = decodeBody(event);
if (!body.appid || !body.pk || !body.domain || (body.runnerLevel !== 'repo' && body.runnerLevel !== 'org')) {
return response(400, 'Missing fields');
}
await (0, lambda_helpers_1.updateSecretValue)(process.env.GITHUB_SECRET_ARN, JSON.stringify({
domain: body.domain,
appId: body.appid,
personalAuthToken: '',
runnerLevel: body.runnerLevel,
}));
await (0, lambda_helpers_1.updateSecretValue)(process.env.GITHUB_PRIVATE_KEY_SECRET_ARN, body.pk);
await (0, lambda_helpers_1.updateSecretValue)(process.env.SETUP_SECRET_ARN, JSON.stringify({ token: '' }));
return response(200, 'Existing app set. Don\'t forget to set up the webhook.');
}
async function handler(event) {
// confirm required environment variables
if (!process.env.WEBHOOK_URL) {
throw new Error('Missing environment variables');
}
const setupToken = (await (0, lambda_helpers_1.getSecretJsonValue)(process.env.SETUP_SECRET_ARN)).token;
// bail out if setup was already completed
if (!setupToken) {
return response(200, 'Setup already complete. Put a new token in the setup secret if you want to redo it.');
}
if (!event.queryStringParameters) {
return response(403, 'Wrong setup token.');
}
// safely confirm url token matches our secret
const urlToken = event.queryStringParameters.token || event.queryStringParameters.state || '';
if (urlToken.length != setupToken.length || !crypto.timingSafeEqual(Buffer.from(urlToken, 'utf-8'), Buffer.from(setupToken, 'utf-8'))) {
return response(403, 'Wrong setup token.');
}
// handle requests
try {
const path = event.path ?? event.rawPath;
const method = event.httpMethod ?? event.requestContext.http.method;
if (path == '/') {
return await handleRoot(event, setupToken);
}
else if (path == '/domain' && method == 'POST') {
return await handleDomain(event);
}
else if (path == '/pat' && method == 'POST') {
return await handlePat(event);
}
else if (path == '/complete-new-app' && method == 'GET') {
return await handleNewApp(event);
}
else if (path == '/app' && method == 'POST') {
return await handleExistingApp(event);
}
else {
return response(404, 'Not found');
}
}
catch (e) {
console.error({
notice: 'Setup handler failed',
error: e,
});
return response(500, `<b>Error:</b> ${e}`);
}
}
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* as crypto from 'crypto';\nimport * as fs from 'fs';\nimport * as AWSLambda from 'aws-lambda';\nimport { baseUrlFromDomain, GitHubSecrets, loadOctokitRest } from './lambda-github';\nimport { getSecretJsonValue, updateSecretValue } from './lambda-helpers';\n\ntype ApiGatewayEvent = AWSLambda.APIGatewayProxyEvent | AWSLambda.APIGatewayProxyEventV2;\n\nconst nonce = crypto.randomBytes(64).toString('hex');\n\nfunction getHtml(baseUrl: string, token: string, domain: string): string {\n  return fs.readFileSync('index.html', 'utf-8')\n    .replace(/INSERT_WEBHOOK_URL_HERE/g, process.env.WEBHOOK_URL!)\n    .replace(/INSERT_BASE_URL_HERE/g, baseUrl)\n    .replace(/INSERT_TOKEN_HERE/g, token)\n    .replace(/INSERT_SECRET_ARN_HERE/g, process.env.SETUP_SECRET_ARN!)\n    .replace(/INSERT_DOMAIN_HERE/g, domain)\n    .replace(/<script/g, `<script nonce=\"${nonce}\"`)\n    .replace(/<style/g, `<style nonce=\"${nonce}\"`);\n}\n\nfunction response(code: number, body: string): AWSLambda.APIGatewayProxyResultV2 {\n  return {\n    statusCode: code,\n    headers: {\n      'Content-Type': 'text/html',\n      'Content-Security-Policy': `default-src 'unsafe-inline' 'nonce-${nonce}'; img-src data:; connect-src 'self'; form-action https:; frame-ancestors 'none'; object-src 'none'; base-uri 'self'`,\n    },\n    body: body,\n  };\n}\n\nasync function handleRoot(event: ApiGatewayEvent, setupToken: string): Promise<AWSLambda.APIGatewayProxyResultV2> {\n  const stage = event.requestContext.stage == '$default' ? '' : `/${event.requestContext.stage}`;\n  const setupBaseUrl = `https://${event.requestContext.domainName}${stage}`;\n  const githubSecrets: GitHubSecrets = await getSecretJsonValue(process.env.GITHUB_SECRET_ARN);\n\n  return response(200, getHtml(setupBaseUrl, setupToken, githubSecrets.domain));\n}\n\nfunction decodeBody(event: ApiGatewayEvent) {\n  let body = event.body;\n  if (!body) {\n    throw new Error('No body found');\n  }\n  if (event.isBase64Encoded) {\n    body = Buffer.from(body, 'base64').toString('utf-8');\n  }\n  return JSON.parse(body);\n}\n\nasync function handleDomain(event: ApiGatewayEvent): Promise<AWSLambda.APIGatewayProxyResultV2> {\n  const body = decodeBody(event);\n  if (!body.domain) {\n    return response(400, 'Invalid domain');\n  }\n  if (body.runnerLevel !== 'repo' && body.runnerLevel !== 'org') {\n    return response(400, 'Invalid runner registration level');\n  }\n\n  const githubSecrets: GitHubSecrets = await getSecretJsonValue(process.env.GITHUB_SECRET_ARN);\n  githubSecrets.domain = body.domain;\n  githubSecrets.runnerLevel = body.runnerLevel;\n  await updateSecretValue(process.env.GITHUB_SECRET_ARN, JSON.stringify(githubSecrets));\n  return response(200, 'Domain set');\n}\n\nasync function handlePat(event: ApiGatewayEvent): Promise<AWSLambda.APIGatewayProxyResultV2> {\n  const body = decodeBody(event);\n  if (!body.pat || !body.domain) {\n    return response(400, 'Invalid personal access token');\n  }\n\n  await updateSecretValue(process.env.GITHUB_SECRET_ARN, JSON.stringify(<GitHubSecrets>{\n    domain: body.domain,\n    appId: -1,\n    personalAuthToken: body.pat,\n    runnerLevel: 'repo',\n  }));\n  await updateSecretValue(process.env.SETUP_SECRET_ARN, JSON.stringify({ token: '' }));\n\n  return response(200, 'Personal access token set');\n}\n\nasync function handleNewApp(event: ApiGatewayEvent): Promise<AWSLambda.APIGatewayProxyResultV2> {\n  if (!event.queryStringParameters) {\n    return response(400, 'Invalid code');\n  }\n\n  const code = event.queryStringParameters.code;\n\n  if (!code) {\n    return response(400, 'Invalid code');\n  }\n\n  const githubSecrets: GitHubSecrets = await getSecretJsonValue(process.env.GITHUB_SECRET_ARN);\n  const baseUrl = baseUrlFromDomain(githubSecrets.domain);\n  const { Octokit } = await loadOctokitRest();\n  const newApp = await new Octokit({ baseUrl }).rest.apps.createFromManifest({ code });\n\n  githubSecrets.appId = newApp.data.id;\n  githubSecrets.domain = new URL(newApp.data.html_url).host; // just in case it's different\n  githubSecrets.personalAuthToken = '';\n  // don't update runnerLevel as it was set by handleDomain() above\n\n  await updateSecretValue(process.env.GITHUB_SECRET_ARN, JSON.stringify(githubSecrets));\n  await updateSecretValue(process.env.GITHUB_PRIVATE_KEY_SECRET_ARN, newApp.data.pem);\n  await updateSecretValue(process.env.WEBHOOK_SECRET_ARN, JSON.stringify({\n    webhookSecret: newApp.data.webhook_secret,\n  }));\n  await updateSecretValue(process.env.SETUP_SECRET_ARN, JSON.stringify({ token: '' }));\n\n  return response(200, `New app set. <a href=\"${newApp.data.html_url}/installations/new\">Install it</a> for your repositories.`);\n}\n\nasync function handleExistingApp(event: ApiGatewayEvent): Promise<AWSLambda.APIGatewayProxyResultV2> {\n  const body = decodeBody(event);\n\n  if (!body.appid || !body.pk || !body.domain || (body.runnerLevel !== 'repo' && body.runnerLevel !== 'org')) {\n    return response(400, 'Missing fields');\n  }\n\n  await updateSecretValue(process.env.GITHUB_SECRET_ARN, JSON.stringify(<GitHubSecrets>{\n    domain: body.domain,\n    appId: body.appid,\n    personalAuthToken: '',\n    runnerLevel: body.runnerLevel,\n  }));\n  await updateSecretValue(process.env.GITHUB_PRIVATE_KEY_SECRET_ARN, body.pk as string);\n  await updateSecretValue(process.env.SETUP_SECRET_ARN, JSON.stringify({ token: '' }));\n\n  return response(200, 'Existing app set. Don\\'t forget to set up the webhook.');\n}\n\nexport async function handler(event: ApiGatewayEvent): Promise<AWSLambda.APIGatewayProxyResultV2> {\n  // confirm required environment variables\n  if (!process.env.WEBHOOK_URL) {\n    throw new Error('Missing environment variables');\n  }\n\n  const setupToken = (await getSecretJsonValue(process.env.SETUP_SECRET_ARN)).token;\n\n  // bail out if setup was already completed\n  if (!setupToken) {\n    return response(200, 'Setup already complete. Put a new token in the setup secret if you want to redo it.');\n  }\n\n  if (!event.queryStringParameters) {\n    return response(403, 'Wrong setup token.');\n  }\n\n  // safely confirm url token matches our secret\n  const urlToken = event.queryStringParameters.token || event.queryStringParameters.state || '';\n  if (urlToken.length != setupToken.length || !crypto.timingSafeEqual(Buffer.from(urlToken, 'utf-8'), Buffer.from(setupToken, 'utf-8'))) {\n    return response(403, 'Wrong setup token.');\n  }\n\n  // handle requests\n  try {\n    const path = (event as AWSLambda.APIGatewayProxyEvent).path ?? (event as AWSLambda.APIGatewayProxyEventV2).rawPath;\n    const method = (event as AWSLambda.APIGatewayProxyEvent).httpMethod ?? (event as AWSLambda.APIGatewayProxyEventV2).requestContext.http.method;\n    if (path == '/') {\n      return await handleRoot(event, setupToken);\n    } else if (path == '/domain' && method == 'POST') {\n      return await handleDomain(event);\n    } else if (path == '/pat' && method == 'POST') {\n      return await handlePat(event);\n    } else if (path == '/complete-new-app' && method == 'GET') {\n      return await handleNewApp(event);\n    } else if (path == '/app' && method == 'POST') {\n      return await handleExistingApp(event);\n    } else {\n      return response(404, 'Not found');\n    }\n  } catch (e) {\n    console.error({\n      notice: 'Setup handler failed',\n      error: e,\n    });\n    return response(500, `<b>Error:</b> ${e}`);\n  }\n}\n"]}