refactor! don't use ctx for policy evaluator (#140)

* refactor! don't use ctx for policy evaluator

pkg/policy/evaluator.go

@@ -2,29 +2,10 @@ package policy
 
 import (
 	"context"
-	"fmt"
 
 	"github.com/docker/attest/pkg/attestation"
 )
 
-type policyEvaluatorCtxKeyType struct{}
-
-var PolicyEvaluatorCtxKey policyEvaluatorCtxKeyType
-
-// sets PolicyEvaluator in context.
-func WithPolicyEvaluator(ctx context.Context, pe Evaluator) context.Context {
-	return context.WithValue(ctx, PolicyEvaluatorCtxKey, pe)
-}
-
-// gets PolicyEvaluator from context, defaults to Rego PolicyEvaluator if not set.
-func GetPolicyEvaluator(ctx context.Context) (Evaluator, error) {
-	t, ok := ctx.Value(PolicyEvaluatorCtxKey).(Evaluator)
-	if !ok {
-		return nil, fmt.Errorf("no policy evaluator client set on context (set one with policy.WithPolicyEvaluator)")
-	}
-	return t, nil
-}
-
 type Evaluator interface {
 	Evaluate(ctx context.Context, resolver attestation.Resolver, pctx *Policy, input *Input) (*Result, error)
 }

pkg/policy/types.go

@@ -34,6 +34,7 @@ type Options struct {
 	PolicyID         string
 	ReferrersRepo    string
 	AttestationStyle config.AttestationStyle
+	Debug            bool
 }
 
 type Policy struct {