Webhooks

Pulumi Webhooks allow you to notify external services of events happening within your Pulumi organization or stack. For example, you can trigger a notification whenever a stack is updated. Whenever an event occurs, Pulumi will send an HTTP POST request to all registered webhooks. The webhook can then be used to emit some notification, start running integration tests, or even update additional stacks.

Webhooks can be used for pretty much anything you want, and are the foundation of most ChatOps workflows.

Management

Webhooks can be attached to either a stack or an organization. Stack webhooks will be notified whenever a stack is updated or changed. Organization webhooks will be notified for events happening within each of the organization’s stacks.

The Webhooks management page is on the Stack or Organization Settings tab.

Create a Webhook

To create a webhook:

1. Navigate to the organization’s Settings.
2. Navigate to Integrations.
3. Select Create webhook.
4. Provide a Display Name, Payload URL, and optionally a Secret.

If a secret is provided, webhook deliveries will contain a signature in the HTTP request header that can be used to authenticate messages as coming from the Pulumi Service.

Event Notifications

The following events will be emitted to webhooks registered to a stack or an organization. Organization-level webhooks will be sent webhook events from all of the stacks within that organization.

The following events are only delivered to organization-based webhooks.

Payloads

Each webhook payload has a format specific to the payload being emitted. Every payload will contain a sender, organization, and stack reference as appropriate. For examples of specific payloads, see Payload Reference below.

Each webhook will contain a user field, which is the user who requested the action, an organization which is the organization name, and a URL for the event. It will also contain the stackName for the stack which was modified when applicable.

Headers

Payloads contain several headers.

The following snippets show how to compute and verify the webhook signature. For examples in other languages, see danharper/hmac-examples.

var crypto = require('crypto');

const sharedSecret = ...
const payload = req.body.toString();

var hmacAlg = crypto.createHmac('sha256', sharedSecret);
var expectedSignature = hmac.update(payloadBody).digest('hex');

import * as crypto from "crypto";

const sharedSecret = ...
const payload = req.body.toString();

const hmacAlg = crypto.createHmac("sha256", stackConfig.sharedSecret);
const hmac = hmacAlg.update(payload).digest("hex");

const result = crypto.timingSafeEqual(Buffer.from(webhookSig), Buffer.from(hmac));

import hashlib
import hmac
import base64

message = bytes('...', 'utf-8')
secret = bytes('...', 'utf-8')

hash = hmac.new(secret, message, hashlib.sha256)
hash.hexdigest()

expected_signature = base64.b64encode(hash.digest())

func computeSignature(payload []byte, secret string) string {
	mac := hmac.New(sha256.New, []byte(secret))
	_, err := mac.Write(payload)
	contract.AssertNoErrorf(err, "computing HMAC digest")
	return fmt.Sprintf("%x", mac.Sum(nil))
}

Payload Examples

Most payloads contain user and organization fields. user contains the identity of the user who triggered the webhook. For example, the person who initiated the stack update or performed the action.

Stack Creation

{
	"user": {
		"name": "Morty Smith",
		"githubLogin": "morty",
		"avatarUrl": "https://crazy-adventures.net/morty.png"
	},
	"organization": {
		"name": "Crazy Adventures",
		"githubLogin": "crazy-adventures",
		"avatarUrl": "https://crazy-adventures.net/logo.png"
	},
	"action": "created",
	"projectName": "website",
	"stackName": "website-prod"
}

Team Stack Update

{
	"user": {
		"name": "Morty Smith",
		"githubLogin": "morty",
		"avatarUrl": "https://crazy-adventures.net/morty.png"
	},
	"organization": {
		"name": "Crazy Adventures",
		"githubLogin": "crazy-adventures",
		"avatarUrl": "https://crazy-adventures.net/logo.png"
	},
	"action": "updated",
	"stackName": "website-prod",
	"team": {
		"kind": "github",
		"name": "Adventurers",
		"members": [
			{
				"name": "Morty Smith",
				"githubLogin": "morty",
				"avatarUrl": "https://crazy-adventures.net/morty.png"
			}
		],
		"stacks": [
			{
				"stackName": "website-prod",
				"permission": 3
			}
		]
	}
}

Stack Update

{
	"user": {
		"name": "Morty Smith",
		"githubLogin": "morty",
		"avatarUrl": "https://crazy-adventures.net/morty.png",
	},
	"organization": {
		"name": "Crazy Adventures",
		"githubLogin": "crazy-adventures",
		"avatarUrl": "https://crazy-adventures.net/logo.png"
	},
	"projectName": "website",
	"stackName": "website-prod",
	"updateUrl": "https://app.pulumi.com/crazy-adventures/website-prod/42",
	"kind": "refresh",
	"result": "succeeded",
	"resourceChanges": {
		"update": 3,
		"delete": 1,
		"update-replace": 2
	}
}

stack_preview event

{
	"user": {
		"name": "Morty Smith",
		"githubLogin": "morty",
		"avatarUrl": "https://crazy-adventures.net/morty.png",
	},
	"organization": {
		"name": "Crazy Adventures",
		"githubLogin": "crazy-adventures",
		"avatarUrl": "https://crazy-adventures.net/logo.png"
	},
	"projectName": "website",
	"stackName": "website-prod",
	"updateUrl": "https://app.pulumi.com/crazy-adventures/website-prod/11bf162b-d9d5-4715-8f88-20dcd0e0b167",
	"kind": "update",
	"result": "failed",
	"resourceChanges": {
		"update": 3,
		"delete": 1,
		"update-replace": 2
	}
}

Additional Resources

• Managing Github Webhooks with Pulumi
• Pulumi Service REST API