package oidc

import (
	"context"

	"gopkg.in/square/go-jose.v2"
)

// KeySet is a set of publc JSON Web Keys that can be used to validate the signature
// of JSON web tokens. This is expected to be backed by a remote key set through
// provider metadata discovery or an in-memory set of keys delivered out-of-band.
type KeySet interface {
	// VerifySignature parses the JSON web token, verifies the signature, and returns
	// the raw payload. Header and claim fields are validated by other parts of the
	// package. For example, the KeySet does not need to check values such as signature
	// algorithm, issuer, and audience since the IDTokenVerifier validates these values
	// independently.
	//
	// If VerifySignature makes HTTP requests to verify the token, it's expected to
	// use any HTTP client associated with the context through ClientContext.
	VerifySignature(ctx context.Context, jws *jose.JSONWebSignature) (payload []byte, err error)
}