# Webhooks

Webhooks let you build automation around BIMData API. Your app can subscribe to certain events on BIMData API and when one event is triggered, we’ll send an HTTP POST payload to the configured URL.

Webhooks can be configured on a cloud. All projects of this cloud emits events.

# Events

Each event corresponds to a set of actions.

Event Triggered when…
bcf.topic.creation a BCF Topic is created
bcf.topic.update a BCF Topic is updated
bcf.comment.creation a BCF comment is created
bcf.comment.update a BCF comment is updated
bcf.topic.full.creation a BCF Topic is created, send a FullTopic object
bcf.topic.full.update a BCF Topic is updated, send a FullTopic object
ifc.process_update the status of an IFC is changed (when it’s processed)
project.update a project is updated
project.creation a project is created

# Payload

Every payload send by BIMData API looks like:

{ "event_name": event_name, "cloud_id": cloud_id, "data": payload }


  • event_name is the name of the triggered event.
  • cloud_id is the cloud that triggered the event.
  • payload is the content of the event.

It mostly uses the same serialization than the API Models.

# Signature

To verify if the Webhook is sent from BIMData API and not from a malicious user, we sign out HTTP POST requests. The signature is an HMAC hex digest generated using the sha256 hash function and the secret as the HMAC key signing the body of the request.

This signature is sent over the x-bimdata-signature HTTP Header.

Here is a python example to check the signature:

import hmac
import hashlib

def is_signed(request):
    req_signature = request.META.get("HTTP_X_BIMDATA_SIGNATURE")
    if not req_signature:
        return False

    body_signature = hmac.new(
        WEBHOOK_SECRET.encode(), request.body, hashlib.sha256

    return hmac.compare_digest(req_signature, body_signature)

# Authorizations

API routes to manage Webhooks require the webhook:manage scope. As these calls don’t involve a user, the app needs to be authorized itself on the Cloud and can’t behave as a User.