mirror of https://github.com/hashicorp/consul
115 lines
2.9 KiB
Go
115 lines
2.9 KiB
Go
package protohcl
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import (
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"fmt"
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"strings"
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"google.golang.org/protobuf/proto"
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"google.golang.org/protobuf/reflect/protoreflect"
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"google.golang.org/protobuf/reflect/protoregistry"
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"google.golang.org/protobuf/types/known/anypb"
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)
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const wellKnownTypeAny = "google.protobuf.Any"
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type AnyTypeProvider interface {
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AnyType(*UnmarshalContext, MessageDecoder) (protoreflect.FullName, MessageDecoder, error)
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}
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type AnyTypeURLProvider struct {
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TypeURLFieldName string
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}
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func (p *AnyTypeURLProvider) AnyType(ctx *UnmarshalContext, decoder MessageDecoder) (protoreflect.FullName, MessageDecoder, error) {
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typeURLFieldName := "type_url"
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if p != nil {
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typeURLFieldName = p.TypeURLFieldName
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}
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var typeURL *IterField
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err := decoder.EachField(FieldIterator{
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Desc: (&anypb.Any{}).ProtoReflect().Descriptor(),
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Func: func(field *IterField) error {
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if field.Name == typeURLFieldName {
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typeURL = field
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}
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return nil
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},
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IgnoreUnknown: true,
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})
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if err != nil {
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return "", nil, err
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}
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if typeURL == nil || typeURL.Val == nil {
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return "", nil, fmt.Errorf("%s field is required to decode Any", typeURLFieldName)
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}
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url, err := stringFromCty(*typeURL.Val)
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if err != nil {
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return "", nil, err
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}
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slashIdx := strings.LastIndex(url, "/")
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typeName := url
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// strip all "hostname" parts of the URL path
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if slashIdx > 1 && slashIdx+1 < len(url) {
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typeName = url[slashIdx+1:]
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}
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return protoreflect.FullName(typeName), decoder.SkipFields(typeURLFieldName), nil
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}
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func (u UnmarshalOptions) decodeAny(ctx *UnmarshalContext, decoder MessageDecoder, msg protoreflect.Message) error {
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var typeProvider AnyTypeProvider = &AnyTypeURLProvider{TypeURLFieldName: "type_url"}
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if u.AnyTypeProvider != nil {
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typeProvider = u.AnyTypeProvider
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}
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var (
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typeName protoreflect.FullName
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err error
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)
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typeName, decoder, err = typeProvider.AnyType(ctx, decoder)
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if err != nil {
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return fmt.Errorf("error getting type for Any field: %w", err)
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}
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// the type.googleapis.come/ should be optional
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mt, err := protoregistry.GlobalTypes.FindMessageByName(typeName)
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if err != nil {
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return fmt.Errorf("error looking up type information for %s: %w", typeName, err)
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}
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newMsg := mt.New()
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err = u.decodeMessage(&UnmarshalContext{
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Parent: ctx.Parent,
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Name: ctx.Name,
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Message: newMsg,
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}, decoder, newMsg)
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if err != nil {
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return err
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}
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enc, err := proto.Marshal(newMsg.Interface())
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if err != nil {
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return fmt.Errorf("error marshalling Any data as protobuf value: %w", err)
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}
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anyValue := msg.Interface().(*anypb.Any)
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// This will look like <proto package>.<proto Message name> and not quite like a full URL with a path
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anyValue.TypeUrl = string(newMsg.Descriptor().FullName())
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anyValue.Value = enc
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return nil
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}
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func isAnyField(desc protoreflect.FieldDescriptor) bool {
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if desc.Kind() != protoreflect.MessageKind {
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return false
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}
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return desc.Message().FullName() == wellKnownTypeAny
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}
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