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proto_decode.go
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/
proto_decode.go
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package form
import (
"encoding/base64"
"errors"
"fmt"
"strconv"
"strings"
"time"
"google.golang.org/genproto/protobuf/field_mask"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
"google.golang.org/protobuf/types/known/durationpb"
"google.golang.org/protobuf/types/known/timestamppb"
"google.golang.org/protobuf/types/known/wrapperspb"
)
func MapProto(msg proto.Message, values map[string][]string) error {
for key, values := range values {
if err := populateFieldValues(msg.ProtoReflect(), strings.Split(key, "."), values); err != nil {
return err
}
}
return nil
}
func populateFieldValues(v protoreflect.Message, fieldPath []string, values []string) error {
if len(fieldPath) < 1 {
return errors.New("no field path")
}
if len(values) < 1 {
return errors.New("no value provided")
}
var fd protoreflect.FieldDescriptor
for i, fieldName := range fieldPath {
fields := v.Descriptor().Fields()
if fd = fields.ByName(protoreflect.Name(fieldName)); fd == nil {
fd = fields.ByJSONName(fieldName)
if fd == nil {
// ignore unexpected field.
return nil
}
}
if i == len(fieldPath)-1 {
break
}
if fd.Message() == nil || fd.Cardinality() == protoreflect.Repeated {
return fmt.Errorf("invalid path: %q is not a message", fieldName)
}
v = v.Mutable(fd).Message()
}
if of := fd.ContainingOneof(); of != nil {
if f := v.WhichOneof(of); f != nil {
return fmt.Errorf("field already set for oneof %q", of.FullName().Name())
}
}
switch {
case fd.IsList():
return populateRepeatedField(fd, v.Mutable(fd).List(), values)
case fd.IsMap():
return populateMapField(fd, v.Mutable(fd).Map(), values)
}
if len(values) > 1 {
return fmt.Errorf("too many values for field %q: %s", fd.FullName().Name(), strings.Join(values, ", "))
}
return populateField(fd, v, values[0])
}
func populateField(fd protoreflect.FieldDescriptor, v protoreflect.Message, value string) error {
val, err := parseField(fd, value)
if err != nil {
return fmt.Errorf("parsing field %q: %w", fd.FullName().Name(), err)
}
v.Set(fd, val)
return nil
}
func populateRepeatedField(fd protoreflect.FieldDescriptor, list protoreflect.List, values []string) error {
for _, value := range values {
v, err := parseField(fd, value)
if err != nil {
return fmt.Errorf("parsing list %q: %w", fd.FullName().Name(), err)
}
list.Append(v)
}
return nil
}
func populateMapField(fd protoreflect.FieldDescriptor, mp protoreflect.Map, values []string) error {
if len(values) != 2 {
return fmt.Errorf("more than one value provided for key %q in map %q", values[0], fd.FullName())
}
key, err := parseField(fd.MapKey(), values[0])
if err != nil {
return fmt.Errorf("parsing map key %q: %w", fd.FullName().Name(), err)
}
value, err := parseField(fd.MapValue(), values[1])
if err != nil {
return fmt.Errorf("parsing map value %q: %w", fd.FullName().Name(), err)
}
mp.Set(key.MapKey(), value)
return nil
}
func parseField(fd protoreflect.FieldDescriptor, value string) (protoreflect.Value, error) {
switch fd.Kind() {
case protoreflect.BoolKind:
v, err := strconv.ParseBool(value)
if err != nil {
return protoreflect.Value{}, err
}
return protoreflect.ValueOfBool(v), nil
case protoreflect.EnumKind:
enum, err := protoregistry.GlobalTypes.FindEnumByName(fd.Enum().FullName())
switch {
case errors.Is(err, protoregistry.NotFound):
return protoreflect.Value{}, fmt.Errorf("enum %q is not registered", fd.Enum().FullName())
case err != nil:
return protoreflect.Value{}, fmt.Errorf("failed to look up enum: %w", err)
}
v := enum.Descriptor().Values().ByName(protoreflect.Name(value))
if v == nil {
i, err := strconv.ParseInt(value, 10, 32)
if err != nil {
return protoreflect.Value{}, fmt.Errorf("%q is not a valid value", value)
}
v = enum.Descriptor().Values().ByNumber(protoreflect.EnumNumber(i))
if v == nil {
return protoreflect.Value{}, fmt.Errorf("%q is not a valid value", value)
}
}
return protoreflect.ValueOfEnum(v.Number()), nil
case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind:
v, err := strconv.ParseInt(value, 10, 32)
if err != nil {
return protoreflect.Value{}, err
}
return protoreflect.ValueOfInt32(int32(v)), nil
case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
v, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return protoreflect.Value{}, err
}
return protoreflect.ValueOfInt64(v), nil
case protoreflect.Uint32Kind, protoreflect.Fixed32Kind:
v, err := strconv.ParseUint(value, 10, 32)
if err != nil {
return protoreflect.Value{}, err
}
return protoreflect.ValueOfUint32(uint32(v)), nil
case protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
v, err := strconv.ParseUint(value, 10, 64)
if err != nil {
return protoreflect.Value{}, err
}
return protoreflect.ValueOfUint64(v), nil
case protoreflect.FloatKind:
v, err := strconv.ParseFloat(value, 32)
if err != nil {
return protoreflect.Value{}, err
}
return protoreflect.ValueOfFloat32(float32(v)), nil
case protoreflect.DoubleKind:
v, err := strconv.ParseFloat(value, 64)
if err != nil {
return protoreflect.Value{}, err
}
return protoreflect.ValueOfFloat64(v), nil
case protoreflect.StringKind:
return protoreflect.ValueOfString(value), nil
case protoreflect.BytesKind:
v, err := base64.StdEncoding.DecodeString(value)
if err != nil {
return protoreflect.Value{}, err
}
return protoreflect.ValueOfBytes(v), nil
case protoreflect.MessageKind, protoreflect.GroupKind:
return parseMessage(fd.Message(), value)
default:
panic(fmt.Sprintf("unknown field kind: %v", fd.Kind()))
}
}
func parseMessage(md protoreflect.MessageDescriptor, value string) (protoreflect.Value, error) {
var msg proto.Message
switch md.FullName() {
case "google.protobuf.Timestamp":
if value == "null" {
break
}
t, err := time.Parse(time.RFC3339Nano, value)
if err != nil {
return protoreflect.Value{}, err
}
msg = timestamppb.New(t)
case "google.protobuf.Duration":
if value == "null" {
break
}
d, err := time.ParseDuration(value)
if err != nil {
return protoreflect.Value{}, err
}
msg = durationpb.New(d)
case "google.protobuf.DoubleValue":
v, err := strconv.ParseFloat(value, 64)
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.Double(v)
case "google.protobuf.FloatValue":
v, err := strconv.ParseFloat(value, 32)
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.Float(float32(v))
case "google.protobuf.Int64Value":
v, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.Int64(v)
case "google.protobuf.Int32Value":
v, err := strconv.ParseInt(value, 10, 32)
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.Int32(int32(v))
case "google.protobuf.UInt64Value":
v, err := strconv.ParseUint(value, 10, 64)
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.UInt64(v)
case "google.protobuf.UInt32Value":
v, err := strconv.ParseUint(value, 10, 32)
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.UInt32(uint32(v))
case "google.protobuf.BoolValue":
v, err := strconv.ParseBool(value)
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.Bool(v)
case "google.protobuf.StringValue":
msg = wrapperspb.String(value)
case "google.protobuf.BytesValue":
v, err := base64.StdEncoding.DecodeString(value)
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.Bytes(v)
case "google.protobuf.FieldMask":
fm := &field_mask.FieldMask{}
fm.Paths = append(fm.Paths, strings.Split(value, ",")...)
msg = fm
default:
return protoreflect.Value{}, fmt.Errorf("unsupported message type: %q", string(md.FullName()))
}
return protoreflect.ValueOfMessage(msg.ProtoReflect()), nil
}