Initial QSfera import

Server/vendor/github.com/open-policy-agent/opa/v1/topdown/parse.go

@@ -0,0 +1,60 @@
+// Copyright 2018 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 topdown
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+
+	"github.com/open-policy-agent/opa/v1/ast"
+	"github.com/open-policy-agent/opa/v1/topdown/builtins"
+)
+
+func builtinRegoParseModule(_ BuiltinContext, operands []*ast.Term, iter func(*ast.Term) error) error {
+
+	filename, err := builtins.StringOperand(operands[0].Value, 1)
+	if err != nil {
+		return err
+	}
+
+	input, err := builtins.StringOperand(operands[1].Value, 1)
+	if err != nil {
+		return err
+	}
+
+	// FIXME: Use configured rego-version?
+	module, err := ast.ParseModule(string(filename), string(input))
+	if err != nil {
+		return err
+	}
+
+	var buf bytes.Buffer
+	if err := json.NewEncoder(&buf).Encode(module); err != nil {
+		return err
+	}
+
+	term, err := ast.ParseTerm(buf.String())
+	if err != nil {
+		return err
+	}
+
+	return iter(term)
+}
+
+func registerRegoMetadataBuiltinFunction(builtin *ast.Builtin) {
+	f := func(BuiltinContext, []*ast.Term, func(*ast.Term) error) error {
+		// The compiler should replace all usage of this function, so the only way to get here is within a query;
+		// which cannot define rules.
+		return fmt.Errorf("the %s function must only be called within the scope of a rule", builtin.Name)
+	}
+	RegisterBuiltinFunc(builtin.Name, f)
+}
+
+func init() {
+	RegisterBuiltinFunc(ast.RegoParseModule.Name, builtinRegoParseModule)
+	registerRegoMetadataBuiltinFunction(ast.RegoMetadataChain)
+	registerRegoMetadataBuiltinFunction(ast.RegoMetadataRule)
+}