From 0fb7bed1c0c701958d0319018ccdda7e851163e0 Mon Sep 17 00:00:00 2001
From: Aleksandr Didenko <aa.didenko@yandex.ru>
Date: Sun, 8 Mar 2015 15:43:37 +0100
Subject: [PATCH] Added support multipart/form-data #109

---
 binding/binding.go | 24 ++++++++++++++++++++----
 context.go         |  2 ++
 gin.go             | 15 ++++++++-------
 3 files changed, 30 insertions(+), 11 deletions(-)

diff --git a/binding/binding.go b/binding/binding.go
index b49f1e5..f72b943 100644
--- a/binding/binding.go
+++ b/binding/binding.go
@@ -25,14 +25,20 @@ type (
 	// XML binding
 	xmlBinding struct{}
 
-	// // form binding
+	// form binding
 	formBinding struct{}
+
+	// multipart form binding
+	multipartFormBinding struct{}
 )
 
+const MAX_MEMORY = 1 * 1024 * 1024
+
 var (
-	JSON = jsonBinding{}
-	XML  = xmlBinding{}
-	Form = formBinding{} // todo
+	JSON          = jsonBinding{}
+	XML           = xmlBinding{}
+	Form          = formBinding{} // todo
+	MultipartForm = multipartFormBinding{}
 )
 
 func (_ jsonBinding) Bind(req *http.Request, obj interface{}) error {
@@ -63,6 +69,16 @@ func (_ formBinding) Bind(req *http.Request, obj interface{}) error {
 	return Validate(obj)
 }
 
+func (_ multipartFormBinding) Bind(req *http.Request, obj interface{}) error {
+	if err := req.ParseMultipartForm(MAX_MEMORY); err != nil {
+		return err
+	}
+	if err := mapForm(obj, req.Form); err != nil {
+		return err
+	}
+	return Validate(obj)
+}
+
 func mapForm(ptr interface{}, form map[string][]string) error {
 	typ := reflect.TypeOf(ptr).Elem()
 	formStruct := reflect.ValueOf(ptr).Elem()
diff --git a/context.go b/context.go
index c39d5e2..d877514 100644
--- a/context.go
+++ b/context.go
@@ -295,6 +295,8 @@ func (c *Context) Bind(obj interface{}) bool {
 	switch {
 	case c.Request.Method == "GET" || ctype == MIMEPOSTForm:
 		b = binding.Form
+	case ctype == MIMEMultipartPOSTForm:
+		b = binding.MultipartForm
 	case ctype == MIMEJSON:
 		b = binding.JSON
 	case ctype == MIMEXML || ctype == MIMEXML2:
diff --git a/gin.go b/gin.go
index 42c4b1f..3e7181c 100644
--- a/gin.go
+++ b/gin.go
@@ -14,13 +14,14 @@ import (
 )
 
 const (
-	AbortIndex   = math.MaxInt8 / 2
-	MIMEJSON     = "application/json"
-	MIMEHTML     = "text/html"
-	MIMEXML      = "application/xml"
-	MIMEXML2     = "text/xml"
-	MIMEPlain    = "text/plain"
-	MIMEPOSTForm = "application/x-www-form-urlencoded"
+	AbortIndex            = math.MaxInt8 / 2
+	MIMEJSON              = "application/json"
+	MIMEHTML              = "text/html"
+	MIMEXML               = "application/xml"
+	MIMEXML2              = "text/xml"
+	MIMEPlain             = "text/plain"
+	MIMEPOSTForm          = "application/x-www-form-urlencoded"
+	MIMEMultipartPOSTForm = "multipart/form-data"
 )
 
 type (