Initial QSfera import

Server/vendor/github.com/open-policy-agent/opa/v1/resolver/interface.go

@@ -0,0 +1,29 @@
+// Copyright 2020 The OPA Authors.  All rights reserved.
+// Use of this source code is governed by an Apache2
+// license that can be found in the LICENSE file.
+
+package resolver
+
+import (
+	"context"
+
+	"github.com/open-policy-agent/opa/v1/ast"
+	"github.com/open-policy-agent/opa/v1/metrics"
+)
+
+// Resolver defines an external value resolver for OPA evaluations.
+type Resolver interface {
+	Eval(context.Context, Input) (Result, error)
+}
+
+// Input as provided to a Resolver instance when evaluating.
+type Input struct {
+	Ref     ast.Ref
+	Input   *ast.Term
+	Metrics metrics.Metrics
+}
+
+// Result of resolving a ref.
+type Result struct {
+	Value ast.Value
+}