Grafbase SDK for Gateway Extensions

This crate provides building blocks for creating Grafbase Gateway extensions.

There exist four kinds of extensions today:

• [AuthenticationExtension]: Authenticates clients before any GraphQL processing, generating a token with custom data for further extensions.
• [AuthorizationExtension]: Control access to certain fields, objects, interfaces, scalars or enums.
• [FieldResolverExtension]: Called by the gateway to resolve data for a field, replacing or augmenting a GraphQL subgraph.
• [SelectionSetResolverExtension]: Called by the gateway to resolve data downstream from a field, replacing or augmenting a GraphQL subgraph. These extensions have access to the selection set on the field and to the whole GraphQL schema.
• [HooksExtension]: Called by the gateway to perform actions before receiving a request, or right before sending a response.

Each extension has its dedicated documentation and tutorial you can follow through.