// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
  // Use of this source code is governed by a MIT style
  // license that can be found in the LICENSE file.
  
  package binding
  
  import (
  	"bytes"
  	"fmt"
  	"io"
  	"net/http"
  
  	"github.com/gin-gonic/gin/internal/json"
  )
  
  // EnableDecoderUseNumber is used to call the UseNumber method on the JSON
  // Decoder instance. UseNumber causes the Decoder to unmarshal a number into an
  // interface{} as a Number instead of as a float64.
  var EnableDecoderUseNumber = false
  
  type jsonBinding struct{}
  
  func (jsonBinding) Name() string {
  	return "json"
  }
  
  func (jsonBinding) Bind(req *http.Request, obj interface{}) error {
  	if req == nil || req.Body == nil {
  		return fmt.Errorf("invalid request")
  	}
  	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()
  	}
  	if err := decoder.Decode(obj); err != nil {
  		return err
  	}
  	return validate(obj)
  }