forked from go-kratos/kratos
/
proto_encode.go
172 lines (160 loc) · 4.73 KB
/
proto_encode.go
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package form
import (
"encoding/base64"
"fmt"
"net/url"
"reflect"
"strconv"
"strings"
"google.golang.org/genproto/protobuf/field_mask"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
)
// EncodeMap encode proto message to url query.
func EncodeMap(msg proto.Message) (url.Values, error) {
if msg == nil || (reflect.ValueOf(msg).Kind() == reflect.Ptr && reflect.ValueOf(msg).IsNil()) {
return url.Values{}, nil
}
u := make(url.Values)
err := encodeByField(u, "", msg.ProtoReflect())
if err != nil {
return nil, err
}
return u, nil
}
func encodeByField(u url.Values, path string, v protoreflect.Message) error {
for i := 0; i < v.Descriptor().Fields().Len(); i++ {
fd := v.Descriptor().Fields().Get(i)
var key string
var newPath string
if fd.HasJSONName() {
key = fd.JSONName()
} else {
key = fd.TextName()
}
if path == "" {
newPath = key
} else {
newPath = path + "." + key
}
if of := fd.ContainingOneof(); of != nil {
if f := v.WhichOneof(of); f != nil {
if f != fd {
continue
}
}
continue
}
switch {
case fd.IsList():
if v.Get(fd).List().Len() > 0 {
list, err := encodeRepeatedField(fd, v.Get(fd).List())
if err != nil {
return err
}
u[newPath] = list
}
case fd.IsMap():
if v.Get(fd).Map().Len() > 0 {
m, err := encodeMapField(fd, v.Get(fd).Map())
if err != nil {
return err
}
for k, value := range m {
u[fmt.Sprintf("%s[%s]", newPath, k)] = []string{value}
}
}
case (fd.Kind() == protoreflect.MessageKind) || (fd.Kind() == protoreflect.GroupKind):
value, err := encodeMessage(fd.Message(), v.Get(fd))
if err == nil {
u[newPath] = []string{value}
continue
}
err = encodeByField(u, newPath, v.Get(fd).Message())
if err != nil {
return err
}
default:
value, err := EncodeField(fd, v.Get(fd))
if err != nil {
return err
}
u[newPath] = []string{value}
}
}
return nil
}
func encodeRepeatedField(fieldDescriptor protoreflect.FieldDescriptor, list protoreflect.List) ([]string, error) {
var values []string
for i := 0; i < list.Len(); i++ {
value, err := EncodeField(fieldDescriptor, list.Get(i))
if err != nil {
return nil, err
}
values = append(values, value)
}
return values, nil
}
func encodeMapField(fieldDescriptor protoreflect.FieldDescriptor, mp protoreflect.Map) (map[string]string, error) {
m := make(map[string]string)
mp.Range(func(k protoreflect.MapKey, v protoreflect.Value) bool {
key, err := EncodeField(fieldDescriptor.MapValue(), k.Value())
if err != nil {
return false
}
value, err := EncodeField(fieldDescriptor.MapValue(), v)
if err != nil {
return false
}
m[key] = value
return true
})
return m, nil
}
// EncodeField encode proto message filed
func EncodeField(fieldDescriptor protoreflect.FieldDescriptor, value protoreflect.Value) (string, error) {
switch fieldDescriptor.Kind() {
case protoreflect.BoolKind:
return strconv.FormatBool(value.Bool()), nil
case protoreflect.EnumKind:
if fieldDescriptor.Enum().FullName() == "google.protobuf.NullValue" {
return nullStr, nil
}
desc := fieldDescriptor.Enum().Values().ByNumber(value.Enum())
return string(desc.Name()), nil
case protoreflect.StringKind:
return value.String(), nil
case protoreflect.BytesKind:
return base64.URLEncoding.EncodeToString(value.Bytes()), nil
case protoreflect.MessageKind, protoreflect.GroupKind:
return encodeMessage(fieldDescriptor.Message(), value)
default:
return fmt.Sprintf("%v", value.Interface()), nil
}
}
// encodeMessage marshals the fields in the given protoreflect.Message.
// If the typeURL is non-empty, then a synthetic "@type" field is injected
// containing the URL as the value.
func encodeMessage(msgDescriptor protoreflect.MessageDescriptor, value protoreflect.Value) (string, error) {
switch msgDescriptor.FullName() {
case timestampMessageFullname:
return marshalTimestamp(value.Message())
case durationMessageFullname:
return marshalDuration(value.Message())
case bytesMessageFullname:
return marshalBytes(value.Message())
case "google.protobuf.DoubleValue", "google.protobuf.FloatValue", "google.protobuf.Int64Value", "google.protobuf.Int32Value",
"google.protobuf.UInt64Value", "google.protobuf.UInt32Value", "google.protobuf.BoolValue", "google.protobuf.StringValue":
fd := msgDescriptor.Fields()
v := value.Message().Get(fd.ByName(protoreflect.Name("value")))
return fmt.Sprintf("%v", v.Interface()), nil
case "google.protobuf.FieldMask":
m, ok := value.Message().Interface().(*field_mask.FieldMask)
if !ok {
return "", nil
}
return strings.Join(m.Paths, ","), nil
default:
return "", fmt.Errorf("unsupported message type: %q", string(msgDescriptor.FullName()))
}
}