107 lines
3.2 KiB
Go
107 lines
3.2 KiB
Go
// Copyright 2023-2025 Buf Technologies, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cel
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import (
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"github.com/google/cel-go/cel"
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"github.com/google/cel-go/common/types"
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"github.com/google/cel-go/common/types/ref"
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"google.golang.org/protobuf/reflect/protoreflect"
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)
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// ProtoFieldToType resolves the CEL value type for the provided
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// FieldDescriptor. If generic is true, the specific subtypes of map and
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// repeated fields will be replaced with cel.DynType. If forItems is true, the
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// type for the repeated list items is returned instead of the list type itself.
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func ProtoFieldToType(fieldDesc protoreflect.FieldDescriptor, generic, forItems bool) *cel.Type {
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if !forItems {
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switch {
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case fieldDesc.IsMap():
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if generic {
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return cel.MapType(cel.DynType, cel.DynType)
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}
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keyType := ProtoFieldToType(fieldDesc.MapKey(), false, true)
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valType := ProtoFieldToType(fieldDesc.MapValue(), false, true)
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return cel.MapType(keyType, valType)
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case fieldDesc.IsList():
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if generic {
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return cel.ListType(cel.DynType)
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}
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itemType := ProtoFieldToType(fieldDesc, false, true)
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return cel.ListType(itemType)
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}
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}
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if fieldDesc.Kind() == protoreflect.MessageKind ||
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fieldDesc.Kind() == protoreflect.GroupKind {
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switch fqn := fieldDesc.Message().FullName(); fqn {
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case "google.protobuf.Any":
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return cel.AnyType
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case "google.protobuf.Duration":
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return cel.DurationType
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case "google.protobuf.Timestamp":
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return cel.TimestampType
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default:
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return cel.ObjectType(string(fqn))
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}
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}
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return protoKindToType(fieldDesc.Kind())
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}
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func ProtoFieldToValue(fieldDesc protoreflect.FieldDescriptor, value protoreflect.Value, forItems bool) ref.Val {
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switch {
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case fieldDesc.IsList() && !forItems:
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return types.NewProtoList(types.DefaultTypeAdapter, value.List())
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default:
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return types.DefaultTypeAdapter.NativeToValue(value.Interface())
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}
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}
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// protoKindToType maps a protoreflect.Kind to a compatible cel.Type.
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func protoKindToType(kind protoreflect.Kind) *cel.Type {
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switch kind {
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case
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protoreflect.FloatKind,
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protoreflect.DoubleKind:
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return cel.DoubleType
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case
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protoreflect.Int32Kind,
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protoreflect.Int64Kind,
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protoreflect.Sint32Kind,
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protoreflect.Sint64Kind,
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protoreflect.Sfixed32Kind,
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protoreflect.Sfixed64Kind,
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protoreflect.EnumKind:
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return cel.IntType
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case
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protoreflect.Uint32Kind,
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protoreflect.Uint64Kind,
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protoreflect.Fixed32Kind,
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protoreflect.Fixed64Kind:
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return cel.UintType
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case protoreflect.BoolKind:
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return cel.BoolType
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case protoreflect.StringKind:
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return cel.StringType
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case protoreflect.BytesKind:
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return cel.BytesType
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case
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protoreflect.MessageKind,
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protoreflect.GroupKind:
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return cel.DynType
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default:
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return cel.DynType
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}
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}
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