Fail to parse big form

[arthur-xie]

1. code in the file: context/input.go

// CopyBody returns the raw request body data as bytes.
func (input *BeegoInput) CopyBody(MaxMemory int64) []byte {
	if input.Context.Request.Body == nil {
		return []byte{}
	}
	safe := &io.LimitedReader{R: input.Context.Request.Body, N: MaxMemory}
	requestbody, _ := ioutil.ReadAll(safe)
	input.Context.Request.Body.Close()
	bf := bytes.NewBuffer(requestbody)
	input.Context.Request.Body = ioutil.NopCloser(bf)
	input.RequestBody = requestbody
	return requestbody
}

Beego set request body to ioutil.NopCloser(bf).

2. code in go 1.8.1 src/net/http/request.go

func parsePostForm(r *Request) (vs url.Values, err error) {
...
	case ct == "application/x-www-form-urlencoded":
		var reader io.Reader = r.Body
		maxFormSize := int64(1<<63 - 1)
		if _, ok := r.Body.(*maxBytesReader); !ok {
			maxFormSize = int64(10 << 20) // 10 MB is a lot of text.
			reader = io.LimitReader(r.Body, maxFormSize+1)
		}
		b, e := ioutil.ReadAll(reader)
		if e != nil {
			if err == nil {
				err = e
			}
			break
		}
...
}

But for big form, go http library need the request body to be *maxBytesReader

3. Modify beego code:

// CopyBody returns the raw request body data as bytes.
func (input *BeegoInput) CopyBody(MaxMemory int64) []byte {
	if input.Context.Request.Body == nil {
		return []byte{}
	}
	safe := &io.LimitedReader{R: input.Context.Request.Body, N: MaxMemory}
	requestbody, _ := ioutil.ReadAll(safe)
	input.Context.Request.Body.Close()
	bf := bytes.NewBuffer(requestbody)
	input.Context.Request.Body = http.MaxBytesReader(input.Context.ResponseWriter, ioutil.NopCloser(bf), MaxMemory)
	input.RequestBody = requestbody
	return requestbody
}

[astaxie]

Thanks