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// Copyright 2018 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 types
import (
"fmt"
"reflect"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
"github.com/google/cel-go/common/types/pb"
"github.com/google/cel-go/common/types/ref"
anypb "google.golang.org/protobuf/types/known/anypb"
structpb "google.golang.org/protobuf/types/known/structpb"
)
type protoObj struct {
Adapter
value proto.Message
typeDesc *pb.TypeDescription
typeValue ref.Val
}
// NewObject returns an object based on a proto.Message value which handles
// conversion between protobuf type values and expression type values.
// Objects support indexing and iteration.
//
// Note: the type value is pulled from the list of registered types within the
// type provider. If the proto type is not registered within the type provider,
// then this will result in an error within the type adapter / provider.
func NewObject(adapter Adapter,
typeDesc *pb.TypeDescription,
typeValue ref.Val,
value proto.Message) ref.Val {
return &protoObj{
Adapter: adapter,
value: value,
typeDesc: typeDesc,
typeValue: typeValue}
}
func (o *protoObj) ConvertToNative(typeDesc reflect.Type) (any, error) {
srcPB := o.value
if reflect.TypeOf(srcPB).AssignableTo(typeDesc) {
return srcPB, nil
}
if reflect.TypeOf(o).AssignableTo(typeDesc) {
return o, nil
}
switch typeDesc {
case anyValueType:
_, isAny := srcPB.(*anypb.Any)
if isAny {
return srcPB, nil
}
return anypb.New(srcPB)
case jsonValueType:
// Marshal the proto to JSON first, and then rehydrate as protobuf.Value as there is no
// support for direct conversion from proto.Message to protobuf.Value.
bytes, err := protojson.Marshal(srcPB)
if err != nil {
return nil, err
}
json := &structpb.Value{}
err = protojson.Unmarshal(bytes, json)
if err != nil {
return nil, err
}
return json, nil
default:
if typeDesc == o.typeDesc.ReflectType() {
return o.value, nil
}
if typeDesc.Kind() == reflect.Ptr {
val := reflect.New(typeDesc.Elem()).Interface()
dstPB, ok := val.(proto.Message)
if ok {
err := pb.Merge(dstPB, srcPB)
if err != nil {
return nil, fmt.Errorf("type conversion error: %v", err)
}
return dstPB, nil
}
}
}
return nil, fmt.Errorf("type conversion error from '%T' to '%v'", o.value, typeDesc)
}
func (o *protoObj) ConvertToType(typeVal ref.Type) ref.Val {
switch typeVal {
default:
if o.Type().TypeName() == typeVal.TypeName() {
return o
}
case TypeType:
return o.typeValue
}
return NewErr("type conversion error from '%s' to '%s'", o.typeDesc.Name(), typeVal)
}
func (o *protoObj) Equal(other ref.Val) ref.Val {
otherPB, ok := other.Value().(proto.Message)
return Bool(ok && pb.Equal(o.value, otherPB))
}
// IsSet tests whether a field which is defined is set to a non-default value.
func (o *protoObj) IsSet(field ref.Val) ref.Val {
protoFieldName, ok := field.(String)
if !ok {
return MaybeNoSuchOverloadErr(field)
}
protoFieldStr := string(protoFieldName)
fd, found := o.typeDesc.FieldByName(protoFieldStr)
if !found {
return NewErr("no such field '%s'", field)
}
if fd.IsSet(o.value) {
return True
}
return False
}
// IsZeroValue returns true if the protobuf object is empty.
func (o *protoObj) IsZeroValue() bool {
return proto.Equal(o.value, o.typeDesc.Zero())
}
func (o *protoObj) Get(index ref.Val) ref.Val {
protoFieldName, ok := index.(String)
if !ok {
return MaybeNoSuchOverloadErr(index)
}
protoFieldStr := string(protoFieldName)
fd, found := o.typeDesc.FieldByName(protoFieldStr)
if !found {
return NewErr("no such field '%s'", index)
}
fv, err := fd.GetFrom(o.value)
if err != nil {
return NewErr(err.Error())
}
return o.NativeToValue(fv)
}
func (o *protoObj) Type() ref.Type {
return o.typeValue.(ref.Type)
}
func (o *protoObj) Value() any {
return o.value
}
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