Fix log http status is always zero (#14400)

* Fix log http status is always zero

* Fix lint

Co-authored-by: 6543 <6543@obermui.de>

modules/context/response.go

@@ -0,0 +1,62 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package context
+
+import "net/http"
+
+// ResponseWriter represents a response writer for HTTP
+type ResponseWriter interface {
+	http.ResponseWriter
+	Flush()
+	Status() int
+}
+
+var (
+	_ ResponseWriter = &Response{}
+)
+
+// Response represents a response
+type Response struct {
+	http.ResponseWriter
+	status int
+}
+
+// Write writes bytes to HTTP endpoint
+func (r *Response) Write(bs []byte) (int, error) {
+	size, err := r.ResponseWriter.Write(bs)
+	if err != nil {
+		return 0, err
+	}
+	if r.status == 0 {
+		r.WriteHeader(200)
+	}
+	return size, nil
+}
+
+// WriteHeader write status code
+func (r *Response) WriteHeader(statusCode int) {
+	r.status = statusCode
+	r.ResponseWriter.WriteHeader(statusCode)
+}
+
+// Flush flush 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
+}
+
+// NewResponse creates a response
+func NewResponse(resp http.ResponseWriter) *Response {
+	if v, ok := resp.(*Response); ok {
+		return v
+	}
+	return &Response{resp, 0}
+}