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
+	})
+}

runtime/marshaler_registry.go

@@ -11,7 +11,10 @@ import (
 
 // MIMEWildcard is the fallback MIME type used for requests which do not match
 // a registered MIME type.
-const MIMEWildcard = "*"
+const (
+	MIMEWildcard       = "*"
+	MIMEFormURLEncoded = "application/x-www-form-urlencoded"
+)
 
 var (
 	acceptHeader      = http.CanonicalHeaderKey("Accept")
@@ -27,6 +30,8 @@ var (
 			},
 		},
 	}
+
+	defaultFormMarshaler = &UrlEncodeMarshal{}
 )
 
 // MarshalerForRequest returns the inbound/outbound marshalers for this request.
@@ -93,7 +98,8 @@ func (m marshalerRegistry) add(mime string, marshaler Marshaler) error {
 func makeMarshalerMIMERegistry() marshalerRegistry {
 	return marshalerRegistry{
 		mimeMap: map[string]Marshaler{
-			MIMEWildcard: defaultMarshaler,
+			MIMEWildcard:       defaultMarshaler,
+			MIMEFormURLEncoded: defaultFormMarshaler,
 		},
 	}
 }