cel/io.go - external/github.com/google/cel-go - Git at Google

 // Copyright 2019 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 package cel

 import (
 	"errors"
 	"fmt"
 	"reflect"

 	"google.golang.org/protobuf/proto"

 	"github.com/google/cel-go/common"
 	"github.com/google/cel-go/common/ast"
 	"github.com/google/cel-go/common/types"
 	"github.com/google/cel-go/common/types/ref"
 	"github.com/google/cel-go/common/types/traits"
 	"github.com/google/cel-go/parser"

 	celpb "cel.dev/expr"
 	exprpb "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
 	anypb "google.golang.org/protobuf/types/known/anypb"
 )

 // CheckedExprToAst converts a checked expression proto message to an Ast.
 func CheckedExprToAst(checkedExpr *exprpb.CheckedExpr) *Ast {
 	checked, _ := CheckedExprToAstWithSource(checkedExpr, nil)
 	return checked
 }

 // CheckedExprToAstWithSource converts a checked expression proto message to an Ast,
 // using the provided Source as the textual contents.
 //
 // In general the source is not necessary unless the AST has been modified between the
 // `Parse` and `Check` calls as an `Ast` created from the `Parse` step will carry the source
 // through future calls.
 //
 // Prefer CheckedExprToAst if loading expressions from storage.
 func CheckedExprToAstWithSource(checkedExpr *exprpb.CheckedExpr, src Source) (*Ast, error) {
 	checked, err := ast.ToAST(checkedExpr)
 	if err != nil {
 		return nil, err
 	}
 	return &Ast{source: src, impl: checked}, nil
 }

 // AstToCheckedExpr converts an Ast to an protobuf CheckedExpr value.
 //
 // If the Ast.IsChecked() returns false, this conversion method will return an error.
 func AstToCheckedExpr(a *Ast) (*exprpb.CheckedExpr, error) {
 	if !a.IsChecked() {
 		return nil, fmt.Errorf("cannot convert unchecked ast")
 	}
 	return ast.ToProto(a.NativeRep())
 }

 // ParsedExprToAst converts a parsed expression proto message to an Ast.
 func ParsedExprToAst(parsedExpr *exprpb.ParsedExpr) *Ast {
 	return ParsedExprToAstWithSource(parsedExpr, nil)
 }

 // ParsedExprToAstWithSource converts a parsed expression proto message to an Ast,
 // using the provided Source as the textual contents.
 //
 // In general you only need this if you need to recheck a previously checked
 // expression, or if you need to separately check a subset of an expression.
 //
 // Prefer ParsedExprToAst if loading expressions from storage.
 func ParsedExprToAstWithSource(parsedExpr *exprpb.ParsedExpr, src Source) *Ast {
 	info, _ := ast.ProtoToSourceInfo(parsedExpr.GetSourceInfo())
 	if src == nil {
 		src = common.NewInfoSource(parsedExpr.GetSourceInfo())
 	}
 	e, _ := ast.ProtoToExpr(parsedExpr.GetExpr())
 	return &Ast{source: src, impl: ast.NewAST(e, info)}
 }

 // AstToParsedExpr converts an Ast to an protobuf ParsedExpr value.
 func AstToParsedExpr(a *Ast) (*exprpb.ParsedExpr, error) {
 	return &exprpb.ParsedExpr{
 		Expr:       a.Expr(),
 		SourceInfo: a.SourceInfo(),
 	}, nil
 }

 // AstToString converts an Ast back to a string if possible.
 //
 // Note, the conversion may not be an exact replica of the original expression, but will produce
 // a string that is semantically equivalent and whose textual representation is stable.
 func AstToString(a *Ast) (string, error) {
 	return ExprToString(a.NativeRep().Expr(), a.NativeRep().SourceInfo())
 }

 // ExprToString converts an AST Expr node back to a string using macro call tracking metadata from
 // source info if any macros are encountered within the expression.
 func ExprToString(e ast.Expr, info *ast.SourceInfo) (string, error) {
 	return parser.Unparse(e, info)
 }

 // RefValueToValue converts between ref.Val and google.api.expr.v1alpha1.Value.
 // The result Value is the serialized proto form. The ref.Val must not be error or unknown.
 func RefValueToValue(res ref.Val) (*exprpb.Value, error) {
 	return ValueAsAlphaProto(res)
 }

 // ValueAsAlphaProto converts between ref.Val and google.api.expr.v1alpha1.Value.
 // The result Value is the serialized proto form. The ref.Val must not be error or unknown.
 func ValueAsAlphaProto(res ref.Val) (*exprpb.Value, error) {
 	canonical, err := ValueAsProto(res)
 	if err != nil {
 		return nil, err
 	}
 	alpha := &exprpb.Value{}
 	err = convertProto(canonical, alpha)
 	return alpha, err
 }

 // RefValToExprValue converts between ref.Val and google.api.expr.v1alpha1.ExprValue.
 // The result ExprValue is the serialized proto form.
 func RefValToExprValue(res ref.Val) (*exprpb.ExprValue, error) {
 	return ExprValueAsAlphaProto(res)
 }

 // ExprValueAsAlphaProto converts between ref.Val and google.api.expr.v1alpha1.ExprValue.
 // The result ExprValue is the serialized proto form.
 func ExprValueAsAlphaProto(res ref.Val) (*exprpb.ExprValue, error) {
 	canonical, err := ExprValueAsProto(res)
 	if err != nil {
 		return nil, err
 	}
 	alpha := &exprpb.ExprValue{}
 	err = convertProto(canonical, alpha)
 	return alpha, err
 }

 // ExprValueAsProto converts between ref.Val and cel.expr.ExprValue.
 // The result ExprValue is the serialized proto form.
 func ExprValueAsProto(res ref.Val) (*celpb.ExprValue, error) {
 	switch res := res.(type) {
 	case *types.Unknown:
 		return &celpb.ExprValue{
 			Kind: &celpb.ExprValue_Unknown{
 				Unknown: &celpb.UnknownSet{
 					Exprs: res.IDs(),
 				},
 			}}, nil
 	case *types.Err:
 		return &celpb.ExprValue{
 			Kind: &celpb.ExprValue_Error{
 				Error: &celpb.ErrorSet{
 					// Keeping the error code as UNKNOWN since there's no error codes associated with
 					// Cel-Go runtime errors.
 					Errors: []*celpb.Status{{Code: 2, Message: res.Error()}},
 				},
 			},
 		}, nil
 	default:
 		val, err := ValueAsProto(res)
 		if err != nil {
 			return nil, err
 		}
 		return &celpb.ExprValue{
 			Kind: &celpb.ExprValue_Value{Value: val}}, nil
 	}
 }

 // ValueAsProto converts between ref.Val and cel.expr.Value.
 // The result Value is the serialized proto form. The ref.Val must not be error or unknown.
 func ValueAsProto(res ref.Val) (*celpb.Value, error) {
 	switch res.Type() {
 	case types.BoolType:
 		return &celpb.Value{
 			Kind: &celpb.Value_BoolValue{BoolValue: res.Value().(bool)}}, nil
 	case types.BytesType:
 		return &celpb.Value{
 			Kind: &celpb.Value_BytesValue{BytesValue: res.Value().([]byte)}}, nil
 	case types.DoubleType:
 		return &celpb.Value{
 			Kind: &celpb.Value_DoubleValue{DoubleValue: res.Value().(float64)}}, nil
 	case types.IntType:
 		return &celpb.Value{
 			Kind: &celpb.Value_Int64Value{Int64Value: res.Value().(int64)}}, nil
 	case types.ListType:
 		l := res.(traits.Lister)
 		sz := l.Size().(types.Int)
 		elts := make([]*celpb.Value, 0, int64(sz))
 		for i := types.Int(0); i < sz; i++ {
 			v, err := ValueAsProto(l.Get(i))
 			if err != nil {
 				return nil, err
 			}
 			elts = append(elts, v)
 		}
 		return &celpb.Value{
 			Kind: &celpb.Value_ListValue{
 				ListValue: &celpb.ListValue{Values: elts}}}, nil
 	case types.MapType:
 		mapper := res.(traits.Mapper)
 		sz := mapper.Size().(types.Int)
 		entries := make([]*celpb.MapValue_Entry, 0, int64(sz))
 		for it := mapper.Iterator(); it.HasNext().(types.Bool); {
 			k := it.Next()
 			v := mapper.Get(k)
 			kv, err := ValueAsProto(k)
 			if err != nil {
 				return nil, err
 			}
 			vv, err := ValueAsProto(v)
 			if err != nil {
 				return nil, err
 			}
 			entries = append(entries, &celpb.MapValue_Entry{Key: kv, Value: vv})
 		}
 		return &celpb.Value{
 			Kind: &celpb.Value_MapValue{
 				MapValue: &celpb.MapValue{Entries: entries}}}, nil
 	case types.NullType:
 		return &celpb.Value{
 			Kind: &celpb.Value_NullValue{}}, nil
 	case types.StringType:
 		return &celpb.Value{
 			Kind: &celpb.Value_StringValue{StringValue: res.Value().(string)}}, nil
 	case types.TypeType:
 		typeName := res.(ref.Type).TypeName()
 		return &celpb.Value{Kind: &celpb.Value_TypeValue{TypeValue: typeName}}, nil
 	case types.UintType:
 		return &celpb.Value{
 			Kind: &celpb.Value_Uint64Value{Uint64Value: res.Value().(uint64)}}, nil
 	default:
 		any, err := res.ConvertToNative(anyPbType)
 		if err != nil {
 			return nil, err
 		}
 		return &celpb.Value{
 			Kind: &celpb.Value_ObjectValue{ObjectValue: any.(*anypb.Any)}}, nil
 	}
 }

 var (
 	typeNameToTypeValue = map[string]ref.Val{
 		"bool":      types.BoolType,
 		"bytes":     types.BytesType,
 		"double":    types.DoubleType,
 		"null_type": types.NullType,
 		"int":       types.IntType,
 		"list":      types.ListType,
 		"map":       types.MapType,
 		"string":    types.StringType,
 		"type":      types.TypeType,
 		"uint":      types.UintType,
 	}

 	anyPbType = reflect.TypeOf(&anypb.Any{})
 )

 // ValueToRefValue converts between google.api.expr.v1alpha1.Value and ref.Val.
 func ValueToRefValue(adapter types.Adapter, v *exprpb.Value) (ref.Val, error) {
 	return AlphaProtoAsValue(adapter, v)
 }

 // AlphaProtoAsValue converts between google.api.expr.v1alpha1.Value and ref.Val.
 func AlphaProtoAsValue(adapter types.Adapter, v *exprpb.Value) (ref.Val, error) {
 	canonical := &celpb.Value{}
 	if err := convertProto(v, canonical); err != nil {
 		return nil, err
 	}
 	return ProtoAsValue(adapter, canonical)
 }

 // ProtoAsValue converts between cel.expr.Value and ref.Val.
 func ProtoAsValue(adapter types.Adapter, v *celpb.Value) (ref.Val, error) {
 	switch v.Kind.(type) {
 	case *celpb.Value_NullValue:
 		return types.NullValue, nil
 	case *celpb.Value_BoolValue:
 		return types.Bool(v.GetBoolValue()), nil
 	case *celpb.Value_Int64Value:
 		return types.Int(v.GetInt64Value()), nil
 	case *celpb.Value_Uint64Value:
 		return types.Uint(v.GetUint64Value()), nil
 	case *celpb.Value_DoubleValue:
 		return types.Double(v.GetDoubleValue()), nil
 	case *celpb.Value_StringValue:
 		return types.String(v.GetStringValue()), nil
 	case *celpb.Value_BytesValue:
 		return types.Bytes(v.GetBytesValue()), nil
 	case *celpb.Value_ObjectValue:
 		any := v.GetObjectValue()
 		msg, err := anypb.UnmarshalNew(any, proto.UnmarshalOptions{DiscardUnknown: true})
 		if err != nil {
 			return nil, err
 		}
 		return adapter.NativeToValue(msg), nil
 	case *celpb.Value_MapValue:
 		m := v.GetMapValue()
 		entries := make(map[ref.Val]ref.Val)
 		for _, entry := range m.Entries {
 			key, err := ProtoAsValue(adapter, entry.Key)
 			if err != nil {
 				return nil, err
 			}
 			pb, err := ProtoAsValue(adapter, entry.Value)
 			if err != nil {
 				return nil, err
 			}
 			entries[key] = pb
 		}
 		return adapter.NativeToValue(entries), nil
 	case *celpb.Value_ListValue:
 		l := v.GetListValue()
 		elts := make([]ref.Val, len(l.Values))
 		for i, e := range l.Values {
 			rv, err := ProtoAsValue(adapter, e)
 			if err != nil {
 				return nil, err
 			}
 			elts[i] = rv
 		}
 		return adapter.NativeToValue(elts), nil
 	case *celpb.Value_TypeValue:
 		typeName := v.GetTypeValue()
 		tv, ok := typeNameToTypeValue[typeName]
 		if ok {
 			return tv, nil
 		}
 		return types.NewObjectTypeValue(typeName), nil
 	}
 	return nil, errors.New("unknown value")
 }

 func convertProto(src, dst proto.Message) error {
 	pb, err := proto.Marshal(src)
 	if err != nil {
 		return err
 	}
 	err = proto.Unmarshal(pb, dst)
 	return err
 }
	// Copyright 2019 Google LLC
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	package cel

	import (
	"errors"
	"fmt"
	"reflect"

	"google.golang.org/protobuf/proto"

	"github.com/google/cel-go/common"
	"github.com/google/cel-go/common/ast"
	"github.com/google/cel-go/common/types"
	"github.com/google/cel-go/common/types/ref"
	"github.com/google/cel-go/common/types/traits"
	"github.com/google/cel-go/parser"

	celpb "cel.dev/expr"
	exprpb "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
	anypb "google.golang.org/protobuf/types/known/anypb"
	)

	// CheckedExprToAst converts a checked expression proto message to an Ast.
	func CheckedExprToAst(checkedExpr exprpb.CheckedExpr) Ast {
	checked, _ := CheckedExprToAstWithSource(checkedExpr, nil)
	return checked
	}

	// CheckedExprToAstWithSource converts a checked expression proto message to an Ast,
	// using the provided Source as the textual contents.
	//
	// In general the source is not necessary unless the AST has been modified between the
	// `Parse` and `Check` calls as an `Ast` created from the `Parse` step will carry the source
	// through future calls.
	//
	// Prefer CheckedExprToAst if loading expressions from storage.
	func CheckedExprToAstWithSource(checkedExpr exprpb.CheckedExpr, src Source) (Ast, error) {
	checked, err := ast.ToAST(checkedExpr)
	if err != nil {
	return nil, err
	}
	return &Ast{source: src, impl: checked}, nil
	}

	// AstToCheckedExpr converts an Ast to an protobuf CheckedExpr value.
	//
	// If the Ast.IsChecked() returns false, this conversion method will return an error.
	func AstToCheckedExpr(a Ast) (exprpb.CheckedExpr, error) {
	if !a.IsChecked() {
	return nil, fmt.Errorf("cannot convert unchecked ast")
	}
	return ast.ToProto(a.NativeRep())
	}

	// ParsedExprToAst converts a parsed expression proto message to an Ast.
	func ParsedExprToAst(parsedExpr exprpb.ParsedExpr) Ast {
	return ParsedExprToAstWithSource(parsedExpr, nil)
	}

	// ParsedExprToAstWithSource converts a parsed expression proto message to an Ast,
	// using the provided Source as the textual contents.
	//
	// In general you only need this if you need to recheck a previously checked
	// expression, or if you need to separately check a subset of an expression.
	//
	// Prefer ParsedExprToAst if loading expressions from storage.
	func ParsedExprToAstWithSource(parsedExpr exprpb.ParsedExpr, src Source) Ast {
	info, _ := ast.ProtoToSourceInfo(parsedExpr.GetSourceInfo())
	if src == nil {
	src = common.NewInfoSource(parsedExpr.GetSourceInfo())
	}
	e, _ := ast.ProtoToExpr(parsedExpr.GetExpr())
	return &Ast{source: src, impl: ast.NewAST(e, info)}
	}

	// AstToParsedExpr converts an Ast to an protobuf ParsedExpr value.
	func AstToParsedExpr(a Ast) (exprpb.ParsedExpr, error) {
	return &exprpb.ParsedExpr{
	Expr: a.Expr(),
	SourceInfo: a.SourceInfo(),
	}, nil
	}

	// AstToString converts an Ast back to a string if possible.
	//
	// Note, the conversion may not be an exact replica of the original expression, but will produce
	// a string that is semantically equivalent and whose textual representation is stable.
	func AstToString(a *Ast) (string, error) {
	return ExprToString(a.NativeRep().Expr(), a.NativeRep().SourceInfo())
	}

	// ExprToString converts an AST Expr node back to a string using macro call tracking metadata from
	// source info if any macros are encountered within the expression.
	func ExprToString(e ast.Expr, info *ast.SourceInfo) (string, error) {
	return parser.Unparse(e, info)
	}

	// RefValueToValue converts between ref.Val and google.api.expr.v1alpha1.Value.
	// The result Value is the serialized proto form. The ref.Val must not be error or unknown.
	func RefValueToValue(res ref.Val) (*exprpb.Value, error) {
	return ValueAsAlphaProto(res)
	}

	// ValueAsAlphaProto converts between ref.Val and google.api.expr.v1alpha1.Value.
	// The result Value is the serialized proto form. The ref.Val must not be error or unknown.
	func ValueAsAlphaProto(res ref.Val) (*exprpb.Value, error) {
	canonical, err := ValueAsProto(res)
	if err != nil {
	return nil, err
	}
	alpha := &exprpb.Value{}
	err = convertProto(canonical, alpha)
	return alpha, err
	}

	// RefValToExprValue converts between ref.Val and google.api.expr.v1alpha1.ExprValue.
	// The result ExprValue is the serialized proto form.
	func RefValToExprValue(res ref.Val) (*exprpb.ExprValue, error) {
	return ExprValueAsAlphaProto(res)
	}

	// ExprValueAsAlphaProto converts between ref.Val and google.api.expr.v1alpha1.ExprValue.
	// The result ExprValue is the serialized proto form.
	func ExprValueAsAlphaProto(res ref.Val) (*exprpb.ExprValue, error) {
	canonical, err := ExprValueAsProto(res)
	if err != nil {
	return nil, err
	}
	alpha := &exprpb.ExprValue{}
	err = convertProto(canonical, alpha)
	return alpha, err
	}

	// ExprValueAsProto converts between ref.Val and cel.expr.ExprValue.
	// The result ExprValue is the serialized proto form.
	func ExprValueAsProto(res ref.Val) (*celpb.ExprValue, error) {
	switch res := res.(type) {
	case *types.Unknown:
	return &celpb.ExprValue{
	Kind: &celpb.ExprValue_Unknown{
	Unknown: &celpb.UnknownSet{
	Exprs: res.IDs(),
	},
	}}, nil
	case *types.Err:
	return &celpb.ExprValue{
	Kind: &celpb.ExprValue_Error{
	Error: &celpb.ErrorSet{
	// Keeping the error code as UNKNOWN since there's no error codes associated with
	// Cel-Go runtime errors.
	Errors: []*celpb.Status{{Code: 2, Message: res.Error()}},
	},
	},
	}, nil
	default:
	val, err := ValueAsProto(res)
	if err != nil {
	return nil, err
	}
	return &celpb.ExprValue{
	Kind: &celpb.ExprValue_Value{Value: val}}, nil
	}
	}

	// ValueAsProto converts between ref.Val and cel.expr.Value.
	// The result Value is the serialized proto form. The ref.Val must not be error or unknown.
	func ValueAsProto(res ref.Val) (*celpb.Value, error) {
	switch res.Type() {
	case types.BoolType:
	return &celpb.Value{
	Kind: &celpb.Value_BoolValue{BoolValue: res.Value().(bool)}}, nil
	case types.BytesType:
	return &celpb.Value{
	Kind: &celpb.Value_BytesValue{BytesValue: res.Value().([]byte)}}, nil
	case types.DoubleType:
	return &celpb.Value{
	Kind: &celpb.Value_DoubleValue{DoubleValue: res.Value().(float64)}}, nil
	case types.IntType:
	return &celpb.Value{
	Kind: &celpb.Value_Int64Value{Int64Value: res.Value().(int64)}}, nil
	case types.ListType:
	l := res.(traits.Lister)
	sz := l.Size().(types.Int)
	elts := make([]*celpb.Value, 0, int64(sz))
	for i := types.Int(0); i < sz; i++ {
	v, err := ValueAsProto(l.Get(i))
	if err != nil {
	return nil, err
	}
	elts = append(elts, v)
	}
	return &celpb.Value{
	Kind: &celpb.Value_ListValue{
	ListValue: &celpb.ListValue{Values: elts}}}, nil
	case types.MapType:
	mapper := res.(traits.Mapper)
	sz := mapper.Size().(types.Int)
	entries := make([]*celpb.MapValue_Entry, 0, int64(sz))
	for it := mapper.Iterator(); it.HasNext().(types.Bool); {
	k := it.Next()
	v := mapper.Get(k)
	kv, err := ValueAsProto(k)
	if err != nil {
	return nil, err
	}
	vv, err := ValueAsProto(v)
	if err != nil {
	return nil, err
	}
	entries = append(entries, &celpb.MapValue_Entry{Key: kv, Value: vv})
	}
	return &celpb.Value{
	Kind: &celpb.Value_MapValue{
	MapValue: &celpb.MapValue{Entries: entries}}}, nil
	case types.NullType:
	return &celpb.Value{
	Kind: &celpb.Value_NullValue{}}, nil
	case types.StringType:
	return &celpb.Value{
	Kind: &celpb.Value_StringValue{StringValue: res.Value().(string)}}, nil
	case types.TypeType:
	typeName := res.(ref.Type).TypeName()
	return &celpb.Value{Kind: &celpb.Value_TypeValue{TypeValue: typeName}}, nil
	case types.UintType:
	return &celpb.Value{
	Kind: &celpb.Value_Uint64Value{Uint64Value: res.Value().(uint64)}}, nil
	default:
	any, err := res.ConvertToNative(anyPbType)
	if err != nil {
	return nil, err
	}
	return &celpb.Value{
	Kind: &celpb.Value_ObjectValue{ObjectValue: any.(*anypb.Any)}}, nil
	}
	}

	var (
	typeNameToTypeValue = map[string]ref.Val{
	"bool": types.BoolType,
	"bytes": types.BytesType,
	"double": types.DoubleType,
	"null_type": types.NullType,
	"int": types.IntType,
	"list": types.ListType,
	"map": types.MapType,
	"string": types.StringType,
	"type": types.TypeType,
	"uint": types.UintType,
	}

	anyPbType = reflect.TypeOf(&anypb.Any{})
	)

	// ValueToRefValue converts between google.api.expr.v1alpha1.Value and ref.Val.
	func ValueToRefValue(adapter types.Adapter, v *exprpb.Value) (ref.Val, error) {
	return AlphaProtoAsValue(adapter, v)
	}

	// AlphaProtoAsValue converts between google.api.expr.v1alpha1.Value and ref.Val.
	func AlphaProtoAsValue(adapter types.Adapter, v *exprpb.Value) (ref.Val, error) {
	canonical := &celpb.Value{}
	if err := convertProto(v, canonical); err != nil {
	return nil, err
	}
	return ProtoAsValue(adapter, canonical)
	}

	// ProtoAsValue converts between cel.expr.Value and ref.Val.
	func ProtoAsValue(adapter types.Adapter, v *celpb.Value) (ref.Val, error) {
	switch v.Kind.(type) {
	case *celpb.Value_NullValue:
	return types.NullValue, nil
	case *celpb.Value_BoolValue:
	return types.Bool(v.GetBoolValue()), nil
	case *celpb.Value_Int64Value:
	return types.Int(v.GetInt64Value()), nil
	case *celpb.Value_Uint64Value:
	return types.Uint(v.GetUint64Value()), nil
	case *celpb.Value_DoubleValue:
	return types.Double(v.GetDoubleValue()), nil
	case *celpb.Value_StringValue:
	return types.String(v.GetStringValue()), nil
	case *celpb.Value_BytesValue:
	return types.Bytes(v.GetBytesValue()), nil
	case *celpb.Value_ObjectValue:
	any := v.GetObjectValue()
	msg, err := anypb.UnmarshalNew(any, proto.UnmarshalOptions{DiscardUnknown: true})
	if err != nil {
	return nil, err
	}
	return adapter.NativeToValue(msg), nil
	case *celpb.Value_MapValue:
	m := v.GetMapValue()
	entries := make(map[ref.Val]ref.Val)
	for _, entry := range m.Entries {
	key, err := ProtoAsValue(adapter, entry.Key)
	if err != nil {
	return nil, err
	}
	pb, err := ProtoAsValue(adapter, entry.Value)
	if err != nil {
	return nil, err
	}
	entries[key] = pb
	}
	return adapter.NativeToValue(entries), nil
	case *celpb.Value_ListValue:
	l := v.GetListValue()
	elts := make([]ref.Val, len(l.Values))
	for i, e := range l.Values {
	rv, err := ProtoAsValue(adapter, e)
	if err != nil {
	return nil, err
	}
	elts[i] = rv
	}
	return adapter.NativeToValue(elts), nil
	case *celpb.Value_TypeValue:
	typeName := v.GetTypeValue()
	tv, ok := typeNameToTypeValue[typeName]
	if ok {
	return tv, nil
	}
	return types.NewObjectTypeValue(typeName), nil
	}
	return nil, errors.New("unknown value")
	}

	func convertProto(src, dst proto.Message) error {
	pb, err := proto.Marshal(src)
	if err != nil {
	return err
	}
	err = proto.Unmarshal(pb, dst)
	return err
	}