Callback URL Retriever.
Dependency pre-hook responsible for ensuring correct callback urls are retrieved or a temporary one is used in it’s place.
get(context, provider, **kwargs)¶
Retrieve the callback URLs for User Pool Client Creation.
When the User Pool is created a Callback URL is required. During a post hook entitled
client_updaterthese Callback URLs are updated to that of the Distribution. Before then we need to ensure that if a Client already exists that the URLs for that client are used to prevent any interuption of service during deploy.