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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"
"net/url"
"strconv"
"strings"
"time"
"google.golang.org/protobuf/encoding/protojson"
"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/fieldmaskpb"
"google.golang.org/protobuf/types/known/structpb"
"google.golang.org/protobuf/types/known/timestamppb"
"google.golang.org/protobuf/types/known/wrapperspb"
)
const fieldSeparator = "."
var errInvalidFormatMapKey = errors.New("invalid formatting for map key")
// DecodeValues decode url value into proto message.
func DecodeValues(msg proto.Message, values url.Values) 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 {
if fd = getFieldDescriptor(v, fieldName); fd == nil {
// ignore unexpected field.
return nil
}
if i == len(fieldPath)-1 {
break
}
if fd.Message() == nil || fd.Cardinality() == protoreflect.Repeated {
if fd.IsMap() && len(fieldPath) > 1 {
// post subfield
return populateMapField(fd, v.Mutable(fd).Map(), []string{fieldPath[1]}, values)
}
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(), fieldPath, 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 getFieldDescriptor(v protoreflect.Message, fieldName string) protoreflect.FieldDescriptor {
var (
fields = v.Descriptor().Fields()
fd = getDescriptorByFieldAndName(fields, fieldName)
)
if fd == nil {
switch {
case v.Descriptor().FullName() == structMessageFullname:
fd = fields.ByNumber(structFieldsFieldNumber)
case len(fieldName) > 2 && strings.HasSuffix(fieldName, "[]"):
fd = getDescriptorByFieldAndName(fields, strings.TrimSuffix(fieldName, "[]"))
default:
// If the type is map, you get the string "map[gkit]", where "map" is a field of proto and "gkit" is a key of map
// Use symbol . for separating fields/structs. (eg. structfield.field)
// ref: https://github.com/go-playground/form
field, _, err := parseURLQueryMapKey(fieldName)
if err != nil {
break
}
fd = getDescriptorByFieldAndName(fields, field)
}
}
return fd
}
func getDescriptorByFieldAndName(fields protoreflect.FieldDescriptors, fieldName string) protoreflect.FieldDescriptor {
var fd protoreflect.FieldDescriptor
if fd = fields.ByName(protoreflect.Name(fieldName)); fd == nil {
fd = fields.ByJSONName(fieldName)
}
return fd
}
func populateField(fd protoreflect.FieldDescriptor, v protoreflect.Message, value string) error {
if value == "" {
return nil
}
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, fieldPath []string, values []string) error {
var (
nKey = len(fieldPath) - 1 // post sub key
vKey = len(values) - 1
fieldName = fieldPath[nKey]
)
_, keyName, err := parseURLQueryMapKey(fieldName)
if err != nil {
return err
}
key, err := parseField(fd.MapKey(), keyName)
if err != nil {
return fmt.Errorf("parsing map key %q: %w", fd.FullName().Name(), err)
}
value, err := parseField(fd.MapValue(), values[vKey])
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) //nolint:gomnd
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) //nolint:gomnd
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) //nolint:gomnd
if err != nil {
return protoreflect.Value{}, err
}
return protoreflect.ValueOfInt64(v), nil
case protoreflect.Uint32Kind, protoreflect.Fixed32Kind:
v, err := strconv.ParseUint(value, 10, 32) //nolint:gomnd
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) //nolint:gomnd
if err != nil {
return protoreflect.Value{}, err
}
return protoreflect.ValueOfUint64(v), nil
case protoreflect.FloatKind:
v, err := strconv.ParseFloat(value, 32) //nolint:gomnd
if err != nil {
return protoreflect.Value{}, err
}
return protoreflect.ValueOfFloat32(float32(v)), nil
case protoreflect.DoubleKind:
v, err := strconv.ParseFloat(value, 64) //nolint:gomnd
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 == nullStr {
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 == nullStr {
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) //nolint:gomnd
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.Double(v)
case "google.protobuf.FloatValue":
v, err := strconv.ParseFloat(value, 32) //nolint:gomnd
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.Float(float32(v))
case "google.protobuf.Int64Value":
v, err := strconv.ParseInt(value, 10, 64) //nolint:gomnd
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.Int64(v)
case "google.protobuf.Int32Value":
v, err := strconv.ParseInt(value, 10, 32) //nolint:gomnd
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.Int32(int32(v))
case "google.protobuf.UInt64Value":
v, err := strconv.ParseUint(value, 10, 64) //nolint:gomnd
if err != nil {
return protoreflect.Value{}, err
}
msg = wrapperspb.UInt64(v)
case "google.protobuf.UInt32Value":
v, err := strconv.ParseUint(value, 10, 32) //nolint:gomnd
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 {
if v, err = base64.URLEncoding.DecodeString(value); err != nil {
return protoreflect.Value{}, err
}
}
msg = wrapperspb.Bytes(v)
case "google.protobuf.FieldMask":
fm := &fieldmaskpb.FieldMask{}
for _, fv := range strings.Split(value, ",") {
fm.Paths = append(fm.Paths, jsonSnakeCase(fv))
}
msg = fm
case "google.protobuf.Value":
fm, err := structpb.NewValue(value)
if err != nil {
return protoreflect.Value{}, err
}
msg = fm
case "google.protobuf.Struct":
var v structpb.Struct
if err := protojson.Unmarshal([]byte(value), &v); err != nil {
return protoreflect.Value{}, err
}
msg = &v
default:
return protoreflect.Value{}, fmt.Errorf("unsupported message type: %q", string(md.FullName()))
}
return protoreflect.ValueOfMessage(msg.ProtoReflect()), nil
}
// jsonSnakeCase converts a camelCase identifier to a snake_case identifier,
// according to the protobuf JSON specification.
// references: https://github.com/protocolbuffers/protobuf-go/blob/master/encoding/protojson/well_known_types.go#L864
func jsonSnakeCase(s string) string {
var b []byte
for i := 0; i < len(s); i++ { // proto identifiers are always ASCII
c := s[i]
if isASCIIUpper(c) {
b = append(b, '_')
c += 'a' - 'A' // convert to lowercase
}
b = append(b, c)
}
return string(b)
}
func isASCIIUpper(c byte) bool {
return 'A' <= c && c <= 'Z'
}
// parseURLQueryMapKey parse the url.Values the field name and key name of the value map type key
// for example: convert "map[key]" to "map" and "key"
func parseURLQueryMapKey(key string) (string, string, error) {
var (
startIndex = strings.IndexByte(key, '[')
endIndex = strings.IndexByte(key, ']')
)
if startIndex < 0 {
//nolint:gomnd
values := strings.SplitN(key, fieldSeparator, 2)
//nolint:gomnd
if len(values) != 2 {
return "", "", errInvalidFormatMapKey
}
return values[0], values[1], nil
}
if startIndex <= 0 || startIndex >= endIndex || len(key) != endIndex+1 {
return "", "", errInvalidFormatMapKey
}
return key[:startIndex], key[startIndex+1 : endIndex], nil
}