mirror of
https://github.com/mickael-kerjean/filestash
synced 2025-12-18 22:39:19 +01:00
119 lines
3.1 KiB
Go
119 lines
3.1 KiB
Go
package httperr
|
|
|
|
// Note: The writer proxies in this file are a heavily modified version of
|
|
// code bearing the following message:
|
|
//
|
|
// Copyright (c) 2014, 2015, 2016 Carl Jackson (carl@avtok.com)
|
|
//
|
|
// MIT License
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
// this software and associated documentation files (the "Software"), to deal in
|
|
// the Software without restriction, including without limitation the rights to
|
|
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
|
|
// the Software, and to permit persons to whom the Software is furnished to do so,
|
|
// subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in all
|
|
// copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
|
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
|
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
|
|
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
import (
|
|
"bufio"
|
|
"bytes"
|
|
"io/ioutil"
|
|
"net"
|
|
"net/http"
|
|
)
|
|
|
|
// wrapWriter wraps an http.ResponseWriter, returning a proxy that
|
|
// tracks the response.
|
|
func wrapWriter(w http.ResponseWriter) (*basicWriter, http.ResponseWriter) {
|
|
_, isCloseNotifier := w.(http.CloseNotifier)
|
|
_, isFlusher := w.(http.Flusher)
|
|
_, isHijacker := w.(http.Hijacker)
|
|
|
|
bw := basicWriter{ResponseWriter: w}
|
|
if isCloseNotifier && isFlusher && isHijacker {
|
|
rv := fancyWriter{bw}
|
|
return &rv.basicWriter, &rv
|
|
}
|
|
if isFlusher {
|
|
rv := flushWriter{bw}
|
|
return &rv.basicWriter, &rv
|
|
}
|
|
return &bw, &bw
|
|
}
|
|
|
|
type basicWriter struct {
|
|
http.ResponseWriter
|
|
|
|
statusCode int
|
|
copy *http.Response
|
|
body *bytes.Buffer
|
|
}
|
|
|
|
func (b *basicWriter) WriteHeader(code int) {
|
|
b.statusCode = code
|
|
if code < 400 {
|
|
b.ResponseWriter.WriteHeader(code)
|
|
return
|
|
}
|
|
|
|
b.copy = &http.Response{
|
|
StatusCode: code,
|
|
Header: b.ResponseWriter.Header(),
|
|
}
|
|
}
|
|
|
|
func (b *basicWriter) Write(buf []byte) (int, error) {
|
|
if b.copy == nil {
|
|
return b.ResponseWriter.Write(buf)
|
|
}
|
|
|
|
if b.body == nil {
|
|
b.body = &bytes.Buffer{}
|
|
b.copy.Body = ioutil.NopCloser(b.body)
|
|
}
|
|
return b.body.Write(buf)
|
|
}
|
|
|
|
type fancyWriter struct {
|
|
basicWriter
|
|
}
|
|
|
|
func (f *fancyWriter) CloseNotify() <-chan bool {
|
|
cn := f.basicWriter.ResponseWriter.(http.CloseNotifier)
|
|
return cn.CloseNotify()
|
|
}
|
|
|
|
func (f *fancyWriter) Flush() {
|
|
fl := f.basicWriter.ResponseWriter.(http.Flusher)
|
|
fl.Flush()
|
|
}
|
|
|
|
func (f *fancyWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
|
|
hj := f.basicWriter.ResponseWriter.(http.Hijacker)
|
|
return hj.Hijack()
|
|
}
|
|
|
|
var _ http.CloseNotifier = &fancyWriter{}
|
|
var _ http.Flusher = &fancyWriter{}
|
|
var _ http.Hijacker = &fancyWriter{}
|
|
|
|
type flushWriter struct {
|
|
basicWriter
|
|
}
|
|
|
|
func (f *flushWriter) Flush() {
|
|
fl := f.basicWriter.ResponseWriter.(http.Flusher)
|
|
fl.Flush()
|
|
}
|
|
|
|
var _ http.Flusher = &flushWriter{}
|