@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.
185 lines • 25.2 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.verifyBody = verifyBody;
exports.handler = handler;
const crypto = require("crypto");
const client_sfn_1 = require("@aws-sdk/client-sfn");
const lambda_github_1 = require("./lambda-github");
const lambda_helpers_1 = require("./lambda-helpers");
const sf = new client_sfn_1.SFNClient();
// TODO use @octokit/webhooks?
function getHeader(event, header) {
// API Gateway doesn't lowercase headers (V1 event) but Lambda URLs do (V2 event) :(
for (const headerName of Object.keys(event.headers)) {
if (headerName.toLowerCase() === header.toLowerCase()) {
return event.headers[headerName];
}
}
return undefined;
}
/**
* Exported for unit testing.
* @internal
*/
function verifyBody(event, secret) {
const sig = Buffer.from(getHeader(event, 'x-hub-signature-256') || '', 'utf8');
if (!event.body) {
throw new Error('No body');
}
let body;
if (event.isBase64Encoded) {
body = Buffer.from(event.body, 'base64');
}
else {
body = Buffer.from(event.body || '', 'utf8');
}
const hmac = crypto.createHmac('sha256', secret);
hmac.update(body);
const expectedSig = Buffer.from(`sha256=${hmac.digest('hex')}`, 'utf8');
console.log('Calculated signature: ', expectedSig.toString());
if (sig.length !== expectedSig.length || !crypto.timingSafeEqual(sig, expectedSig)) {
throw new Error(`Signature mismatch. Expected ${expectedSig.toString()} but got ${sig.toString()}`);
}
return body.toString();
}
async function isDeploymentPending(payload) {
const statusesUrl = payload.deployment?.statuses_url;
if (statusesUrl === undefined) {
return false;
}
try {
const { octokit } = await (0, lambda_github_1.getOctokit)(payload.installation?.id);
const statuses = await octokit.request(statusesUrl);
return statuses.data[0]?.state === 'waiting';
}
catch (e) {
console.error('Unable to check deployment. Try adding deployment read permission.', e);
return false;
}
}
function matchLabelsToProvider(labels) {
const jobLabelSet = labels.map((label) => label.toLowerCase());
const supportedLabels = JSON.parse(process.env.SUPPORTED_LABELS);
// is every label the job requires available in the runner provider?
for (const supportedLabelSet of supportedLabels) {
const lowerCasedSupportedLabelSet = supportedLabelSet.labels.map((label) => label.toLowerCase());
if (jobLabelSet.every(label => label == 'self-hosted' || lowerCasedSupportedLabelSet.includes(label))) {
return supportedLabelSet.provider;
}
}
return undefined;
}
async function handler(event) {
if (!process.env.WEBHOOK_SECRET_ARN || !process.env.STEP_FUNCTION_ARN || !process.env.SUPPORTED_LABELS || !process.env.REQUIRE_SELF_HOSTED_LABEL) {
throw new Error('Missing environment variables');
}
const webhookSecret = (await (0, lambda_helpers_1.getSecretJsonValue)(process.env.WEBHOOK_SECRET_ARN)).webhookSecret;
let body;
try {
body = verifyBody(event, webhookSecret);
}
catch (e) {
console.error(e);
return {
statusCode: 403,
body: 'Bad signature',
};
}
if (getHeader(event, 'content-type') !== 'application/json') {
console.error(`This webhook only accepts JSON payloads, got ${getHeader(event, 'content-type')}`);
return {
statusCode: 400,
body: 'Expecting JSON payload',
};
}
if (getHeader(event, 'x-github-event') === 'ping') {
return {
statusCode: 200,
body: 'Pong',
};
}
// if (getHeader(event, 'x-github-event') !== 'workflow_job' && getHeader(event, 'x-github-event') !== 'workflow_run') {
// console.error(`This webhook only accepts workflow_job and workflow_run, got ${getHeader(event, 'x-github-event')}`);
if (getHeader(event, 'x-github-event') !== 'workflow_job') {
console.error(`This webhook only accepts workflow_job, got ${getHeader(event, 'x-github-event')}`);
return {
statusCode: 400,
body: 'Expecting workflow_job',
};
}
const payload = JSON.parse(body);
if (payload.action !== 'queued') {
console.log({
notice: `Ignoring action "${payload.action}", expecting "queued"`,
job: payload.workflow_job,
});
return {
statusCode: 200,
body: 'OK. No runner started (action is not "queued").',
};
}
if (process.env.REQUIRE_SELF_HOSTED_LABEL === '1' && !payload.workflow_job.labels.includes('self-hosted')) {
console.log({
notice: `Ignoring labels "${payload.workflow_job.labels}", expecting "self-hosted"`,
job: payload.workflow_job,
});
return {
statusCode: 200,
body: 'OK. No runner started (no "self-hosted" label).',
};
}
// don't start step function unless labels match a runner provider
const provider = matchLabelsToProvider(payload.workflow_job.labels);
if (!provider) {
console.log({
notice: `Ignoring labels "${payload.workflow_job.labels}", as they don't match a supported runner provider`,
job: payload.workflow_job,
});
return {
statusCode: 200,
body: 'OK. No runner started (no provider with matching labels).',
};
}
// don't start runners for a deployment that's still pending as GitHub will send another event when it's ready
if (await isDeploymentPending(payload)) {
console.log({
notice: 'Ignoring job as its deployment is still pending',
job: payload.workflow_job,
});
return {
statusCode: 200,
body: 'OK. No runner started (deployment pending).',
};
}
// set execution name which is also used as runner name which are limited to 64 characters
let executionName = payload.repository.full_name.replace('/', '-').slice(0, 50);
let deliveryId = getHeader(event, 'x-github-delivery') ?? `${Math.random()}`;
executionName = `${executionName}-${deliveryId.slice(0, 63 - executionName.length)}`;
// start execution
const input = {
owner: payload.repository.owner.login,
repo: payload.repository.name,
jobId: payload.workflow_job.id,
jobUrl: payload.workflow_job.html_url,
installationId: payload.installation?.id ?? -1, // always pass value because step function can't handle missing input
labels: payload.workflow_job.labels.join(','),
provider: provider,
};
const execution = await sf.send(new client_sfn_1.StartExecutionCommand({
stateMachineArn: process.env.STEP_FUNCTION_ARN,
input: JSON.stringify(input),
// name is not random so multiple execution of this webhook won't cause multiple builders to start
name: executionName,
}));
console.log({
notice: 'Started orchestrator',
execution: execution.executionArn,
sfnInput: input,
job: payload.workflow_job,
});
return {
statusCode: 202,
body: executionName,
};
}
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* as crypto from 'crypto';\nimport { SFNClient, StartExecutionCommand } from '@aws-sdk/client-sfn';\nimport * as AWSLambda from 'aws-lambda';\nimport { getOctokit } from './lambda-github';\nimport { getSecretJsonValue } from './lambda-helpers';\nimport { SupportedLabels } from './webhook';\n\nconst sf = new SFNClient();\n\n// TODO use @octokit/webhooks?\n\nfunction getHeader(event: AWSLambda.APIGatewayProxyEventV2, header: string): string | undefined {\n  // API Gateway doesn't lowercase headers (V1 event) but Lambda URLs do (V2 event) :(\n  for (const headerName of Object.keys(event.headers)) {\n    if (headerName.toLowerCase() === header.toLowerCase()) {\n      return event.headers[headerName];\n    }\n  }\n\n  return undefined;\n}\n\n/**\n * Exported for unit testing.\n * @internal\n */\nexport function verifyBody(event: AWSLambda.APIGatewayProxyEventV2, secret: any): string {\n  const sig = Buffer.from(getHeader(event, 'x-hub-signature-256') || '', 'utf8');\n\n  if (!event.body) {\n    throw new Error('No body');\n  }\n\n  let body: Buffer;\n  if (event.isBase64Encoded) {\n    body = Buffer.from(event.body, 'base64');\n  } else {\n    body = Buffer.from(event.body || '', 'utf8');\n  }\n\n  const hmac = crypto.createHmac('sha256', secret);\n  hmac.update(body);\n  const expectedSig = Buffer.from(`sha256=${hmac.digest('hex')}`, 'utf8');\n\n  console.log('Calculated signature: ', expectedSig.toString());\n\n  if (sig.length !== expectedSig.length || !crypto.timingSafeEqual(sig, expectedSig)) {\n    throw new Error(`Signature mismatch. Expected ${expectedSig.toString()} but got ${sig.toString()}`);\n  }\n\n  return body.toString();\n}\n\nasync function isDeploymentPending(payload: any) {\n  const statusesUrl = payload.deployment?.statuses_url;\n  if (statusesUrl === undefined) {\n    return false;\n  }\n\n  try {\n    const { octokit } = await getOctokit(payload.installation?.id);\n    const statuses = await octokit.request(statusesUrl);\n\n    return statuses.data[0]?.state === 'waiting';\n  } catch (e) {\n    console.error('Unable to check deployment. Try adding deployment read permission.', e);\n    return false;\n  }\n}\n\nfunction matchLabelsToProvider(labels: string[]) {\n  const jobLabelSet = labels.map((label) => label.toLowerCase());\n  const supportedLabels: SupportedLabels[] = JSON.parse(process.env.SUPPORTED_LABELS!);\n\n  // is every label the job requires available in the runner provider?\n  for (const supportedLabelSet of supportedLabels) {\n    const lowerCasedSupportedLabelSet = supportedLabelSet.labels.map((label) => label.toLowerCase());\n    if (jobLabelSet.every(label => label == 'self-hosted' || lowerCasedSupportedLabelSet.includes(label))) {\n      return supportedLabelSet.provider;\n    }\n  }\n\n  return undefined;\n}\n\nexport async function handler(event: AWSLambda.APIGatewayProxyEventV2): Promise<AWSLambda.APIGatewayProxyResultV2> {\n  if (!process.env.WEBHOOK_SECRET_ARN || !process.env.STEP_FUNCTION_ARN || !process.env.SUPPORTED_LABELS || !process.env.REQUIRE_SELF_HOSTED_LABEL) {\n    throw new Error('Missing environment variables');\n  }\n\n  const webhookSecret = (await getSecretJsonValue(process.env.WEBHOOK_SECRET_ARN)).webhookSecret;\n\n  let body;\n  try {\n    body = verifyBody(event, webhookSecret);\n  } catch (e) {\n    console.error(e);\n    return {\n      statusCode: 403,\n      body: 'Bad signature',\n    };\n  }\n\n  if (getHeader(event, 'content-type') !== 'application/json') {\n    console.error(`This webhook only accepts JSON payloads, got ${getHeader(event, 'content-type')}`);\n    return {\n      statusCode: 400,\n      body: 'Expecting JSON payload',\n    };\n  }\n\n  if (getHeader(event, 'x-github-event') === 'ping') {\n    return {\n      statusCode: 200,\n      body: 'Pong',\n    };\n  }\n\n  // if (getHeader(event, 'x-github-event') !== 'workflow_job' && getHeader(event, 'x-github-event') !== 'workflow_run') {\n  //     console.error(`This webhook only accepts workflow_job and workflow_run, got ${getHeader(event, 'x-github-event')}`);\n  if (getHeader(event, 'x-github-event') !== 'workflow_job') {\n    console.error(`This webhook only accepts workflow_job, got ${getHeader(event, 'x-github-event')}`);\n    return {\n      statusCode: 400,\n      body: 'Expecting workflow_job',\n    };\n  }\n\n  const payload = JSON.parse(body);\n\n  if (payload.action !== 'queued') {\n    console.log({\n      notice: `Ignoring action \"${payload.action}\", expecting \"queued\"`,\n      job: payload.workflow_job,\n    });\n    return {\n      statusCode: 200,\n      body: 'OK. No runner started (action is not \"queued\").',\n    };\n  }\n\n  if (process.env.REQUIRE_SELF_HOSTED_LABEL === '1' && !payload.workflow_job.labels.includes('self-hosted')) {\n    console.log({\n      notice: `Ignoring labels \"${payload.workflow_job.labels}\", expecting \"self-hosted\"`,\n      job: payload.workflow_job,\n    });\n    return {\n      statusCode: 200,\n      body: 'OK. No runner started (no \"self-hosted\" label).',\n    };\n  }\n\n  // don't start step function unless labels match a runner provider\n  const provider = matchLabelsToProvider(payload.workflow_job.labels);\n  if (!provider) {\n    console.log({\n      notice: `Ignoring labels \"${payload.workflow_job.labels}\", as they don't match a supported runner provider`,\n      job: payload.workflow_job,\n    });\n    return {\n      statusCode: 200,\n      body: 'OK. No runner started (no provider with matching labels).',\n    };\n  }\n\n  // don't start runners for a deployment that's still pending as GitHub will send another event when it's ready\n  if (await isDeploymentPending(payload)) {\n    console.log({\n      notice: 'Ignoring job as its deployment is still pending',\n      job: payload.workflow_job,\n    });\n    return {\n      statusCode: 200,\n      body: 'OK. No runner started (deployment pending).',\n    };\n  }\n\n  // set execution name which is also used as runner name which are limited to 64 characters\n  let executionName = payload.repository.full_name.replace('/', '-').slice(0, 50);\n  let deliveryId = getHeader(event, 'x-github-delivery') ?? `${Math.random()}`;\n  executionName = `${executionName}-${deliveryId.slice(0, 63-executionName.length)}`;\n  // start execution\n  const input = {\n    owner: payload.repository.owner.login,\n    repo: payload.repository.name,\n    jobId: payload.workflow_job.id,\n    jobUrl: payload.workflow_job.html_url,\n    installationId: payload.installation?.id ?? -1, // always pass value because step function can't handle missing input\n    labels: payload.workflow_job.labels.join(','),\n    provider: provider,\n  };\n  const execution = await sf.send(new StartExecutionCommand({\n    stateMachineArn: process.env.STEP_FUNCTION_ARN,\n    input: JSON.stringify(input),\n    // name is not random so multiple execution of this webhook won't cause multiple builders to start\n    name: executionName,\n  }));\n\n  console.log({\n    notice: 'Started orchestrator',\n    execution: execution.executionArn,\n    sfnInput: input,\n    job: payload.workflow_job,\n  });\n\n  return {\n    statusCode: 202,\n    body: executionName,\n  };\n}\n"]}