Inject content hash into URL into document preview URL

[vsgoulart]

What should we do?

In order for the document preview to work together with Camunda Tasklist we must inject a content hash as query param in the document URL for security reasons.
This content hash will be provided via the metadata and must respect the following shape:

{
  documentId: string,
  contentHash?: string,
  metadata: {
    contentType: string,
    fileName: string,
  }
}

The query param will respect the follow pattern: http://<endpoint with documentId>?contentHash=<hash>

This solution should be a temporary solution because it's specific to Camunda's APIs and we should try to keep form-js as generic as possible. The best solution would be for Camunda Tasklist to have a BFF (backend for frontend) to manage this for the UI.

Why should we do it?

So the document preview works with Camunda Tasklist