feat: support url form encoded marshaler and response in JSON

runtime/marshal_urlencode.go

@@ -0,0 +1,56 @@
+package runtime
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/url"
+
+	"github.com/grpc-ecosystem/grpc-gateway/v2/utilities"
+	"google.golang.org/protobuf/proto"
+)
+
+type UrlEncodeMarshal struct {
+	Marshaler
+}
+
+// ContentType means the content type of the response
+func (u UrlEncodeMarshal) ContentType(_ interface{}) string {
+	return "application/json"
+}
+
+func (u UrlEncodeMarshal) Marshal(v interface{}) ([]byte, error) {
+	// can marshal the response in proto message format
+	j := JSONPb{}
+	return j.Marshal(v)
+}
+
+// NewDecoder indicates how to decode the request
+func (u UrlEncodeMarshal) NewDecoder(r io.Reader) Decoder {
+	return DecoderFunc(func(p interface{}) error {
+		msg, ok := p.(proto.Message)
+		if !ok {
+			return fmt.Errorf("not proto message")
+		}
+
+		formData, err := ioutil.ReadAll(r)
+		if err != nil {
+			return err
+		}
+
+		values, err := url.ParseQuery(string(formData))
+		if err != nil {
+			return err
+		}
+
+		filter := &utilities.DoubleArray{}
+
+		err = PopulateQueryParameters(msg, values, filter)
+
+		if err != nil {
+			return err
+		}
+
+		return nil
+	})
+}