Add BindingBody implementation for some binding

binding/json.go

@@ -5,6 +5,8 @@
 package binding
 
 import (
+	"bytes"
+	"io"
 	"net/http"
 
 	"github.com/gin-gonic/gin/json"
@@ -22,7 +24,15 @@ func (jsonBinding) Name() string {
 }
 
 func (jsonBinding) Bind(req *http.Request, obj interface{}) error {
-	decoder := json.NewDecoder(req.Body)
+	return decodeJSON(req.Body, obj)
+}
+
+func (jsonBinding) BindBody(body []byte, obj interface{}) error {
+	return decodeJSON(bytes.NewReader(body), obj)
+}
+
+func decodeJSON(r io.Reader, obj interface{}) error {
+	decoder := json.NewDecoder(r)
 	if EnableDecoderUseNumber {
 		decoder.UseNumber()
 	}

binding/msgpack.go

@@ -5,6 +5,8 @@
 package binding
 
 import (
+	"bytes"
+	"io"
 	"net/http"
 
 	"github.com/ugorji/go/codec"
@@ -17,7 +19,16 @@ func (msgpackBinding) Name() string {
 }
 
 func (msgpackBinding) Bind(req *http.Request, obj interface{}) error {
-	if err := codec.NewDecoder(req.Body, new(codec.MsgpackHandle)).Decode(&obj); err != nil {
+	return decodeMsgPack(req.Body, obj)
+}
+
+func (msgpackBinding) BindBody(body []byte, obj interface{}) error {
+	return decodeMsgPack(bytes.NewReader(body), obj)
+}
+
+func decodeMsgPack(r io.Reader, obj interface{}) error {
+	cdc := new(codec.MsgpackHandle)
+	if err := codec.NewDecoder(r, cdc).Decode(&obj); err != nil {
 		return err
 	}
 	return validate(obj)

binding/protobuf.go

@@ -17,19 +17,20 @@ func (protobufBinding) Name() string {
 	return "protobuf"
 }
 
-func (protobufBinding) Bind(req *http.Request, obj interface{}) error {
-
+func (b protobufBinding) Bind(req *http.Request, obj interface{}) error {
 	buf, err := ioutil.ReadAll(req.Body)
 	if err != nil {
 		return err
 	}
-
-	if err = proto.Unmarshal(buf, obj.(proto.Message)); err != nil {
-		return err
+	return b.BindBody(buf, obj)
 }
 
-	//Here it's same to return validate(obj), but util now we cann't add `binding:""` to the struct
-	//which automatically generate by gen-proto
+func (protobufBinding) BindBody(body []byte, obj interface{}) error {
+	if err := proto.Unmarshal(body, obj.(proto.Message)); err != nil {
+		return err
+	}
+	// Here it's same to return validate(obj), but util now we cann't add
+	// `binding:""` to the struct which automatically generate by gen-proto
 	return nil
 	// return validate(obj)
 }

binding/xml.go

@@ -5,7 +5,9 @@
 package binding
 
 import (
+	"bytes"
 	"encoding/xml"
+	"io"
 	"net/http"
 )
 
@@ -16,7 +18,14 @@ func (xmlBinding) Name() string {
 }
 
 func (xmlBinding) Bind(req *http.Request, obj interface{}) error {
-	decoder := xml.NewDecoder(req.Body)
+	return decodeXML(req.Body, obj)
+}
+
+func (xmlBinding) BindBody(body []byte, obj interface{}) error {
+	return decodeXML(bytes.NewReader(body), obj)
+}
+func decodeXML(r io.Reader, obj interface{}) error {
+	decoder := xml.NewDecoder(r)
 	if err := decoder.Decode(obj); err != nil {
 		return err
 	}