How to do server-side input creation, encoding, and validation with Amplify + Appsync?

[kwhitejr]

Which Category is your question related to? API

What AWS Services are you utilizing? Amplify + AppSync

Provide additional details e.g. code snippets What is the best practice for performing server-side input creation and validation? For example, in a Create React App scenario with an AppSync backend, when performing a resource creation I've been using uuid within the component to create the necessary ID for the createResourceXYZ() mutation. This type of value seems like something that ought to happen server side.

I have some notion that the solution is to hook into and enrich the resolver, but my understanding is that the auto-generated resolvers are written in VTL. Is VTL robust enough to do more than just create IDs? What is best practice for (1) generating more complex inputs like urls, (2) input transforms like string encoding, or (3) input validations, e.g. regex checks?

Example schema for an Article

type Article @model {
  id: ID!    // should be generated on the server
  title: String!
  description: String!
  text: String!
  category: CATEGORY!
  slug: String!     // should be generated and validated by server
  url: String!     // includes slug + title; should be generated, encoded, validated by server
  lastModified: String!
  creationDate: String!
}

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