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// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package context
import (
"net/http"
)
// ResponseWriter represents a response writer for HTTP
type ResponseWriter interface {
http.ResponseWriter
http.Flusher
Status() int
Before(func(ResponseWriter))
}
var _ ResponseWriter = &Response{}
// Response represents a response
type Response struct {
http.ResponseWriter
written int
status int
befores []func(ResponseWriter)
beforeExecuted bool
}
// Write writes bytes to HTTP endpoint
func (r *Response) Write(bs []byte) (int, error) {
if !r.beforeExecuted {
for _, before := range r.befores {
before(r)
}
r.beforeExecuted = true
}
size, err := r.ResponseWriter.Write(bs)
r.written += size
if err != nil {
return size, err
}
if r.status == 0 {
r.status = http.StatusOK
}
return size, nil
}
// WriteHeader write status code
func (r *Response) WriteHeader(statusCode int) {
if !r.beforeExecuted {
for _, before := range r.befores {
before(r)
}
r.beforeExecuted = true
}
if r.status == 0 {
r.status = statusCode
r.ResponseWriter.WriteHeader(statusCode)
}
}
// Flush flushes cached data
func (r *Response) Flush() {
if f, ok := r.ResponseWriter.(http.Flusher); ok {
f.Flush()
}
}
// Status returned status code written
func (r *Response) Status() int {
return r.status
}
// Before allows for a function to be called before the ResponseWriter has been written to. This is
// useful for setting headers or any other operations that must happen before a response has been written.
func (r *Response) Before(f func(ResponseWriter)) {
r.befores = append(r.befores, f)
}
func WrapResponseWriter(resp http.ResponseWriter) *Response {
if v, ok := resp.(*Response); ok {
return v
}
return &Response{
ResponseWriter: resp,
status: 0,
befores: make([]func(ResponseWriter), 0),
}
}
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