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response.go
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response.go
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package gow
import (
"net/http"
"strconv"
"time"
"encoding/json"
"os"
"path"
"encoding/xml"
)
type Response struct {
http.ResponseWriter
ctx *context
Status int
IsInterrupt bool
IsCommit bool
Body []byte
Headers map[string]string
gow *Gow
}
func NewResponse(w http.ResponseWriter) *Response {
res := new(Response)
res.ResponseWriter = w
res.Status = http.StatusOK
res.IsCommit = false
res.IsInterrupt = false
res.Headers = make(map[string]string)
res.Headers["Content-Type"] = "text/html;charset=UTF-8"
return res
}
// ContentType sets content-type string.
func (res *Response) ContentType(contentType string) {
res.Headers["Content-Type"] = contentType
}
func (res *Response) Text(str string) {
res.ContentType("application/json;charset=UTF-8")
res.Body = []byte(str)
}
// Json set json response with data and proper header.
func (res *Response) Json(data interface{}) {
bytes, err := json.MarshalIndent(data, "", " ")
if err != nil {
panic(err)
}
res.ContentType("application/json;charset=UTF-8")
res.Body = bytes
}
// Xml render
func (res *Response) Xml(data interface{}) {
bytes, err := xml.MarshalIndent(data, "", " ")
if err != nil {
panic(err)
}
res.ContentType("application/xml")
res.Body = bytes
}
// Cookie gets cookie value by given key when give only string.
// Cookie sets cookie value by given key, value and expire time string.
func (res *Response) Cookie(key string, value ...string) string {
t := time.Now()
expire, _ := strconv.Atoi(value[1])
t = t.Add(time.Duration(expire) * time.Second)
cookie := &http.Cookie{
Name: key,
Value: value[0],
Path: "/",
MaxAge: expire,
Expires: t,
}
http.SetCookie(res, cookie)
return ""
}
func (res *Response) Interrupt() {
if res.IsInterrupt {
return
}
if !res.IsCommit {
res.Commit()
}
res.IsInterrupt = true
}
func (res *Response) Commit() {
if res.IsCommit {
return
}
for name, value := range res.Headers {
res.Header().Set(name, value)
}
if res.IsInterrupt {
res.WriteHeader(res.Status)
}
res.Write(res.Body)
res.IsCommit = true
}
func (res *Response) Throw(status int) {
res.Status = status
res.Commit()
}
// Download sends file download response by file path.
func (res *Response) Download(file string) {
f, e := os.Stat(file)
if e != nil {
res.Status = http.StatusNotFound
return
}
if f.IsDir() {
res.Status = http.StatusForbidden
return
}
output := res.Header()
output.Set("Content-Type", "application/octet-stream")
output.Set("Content-Disposition", "attachment; filename="+path.Base(file))
output.Set("Content-Transfer-Encoding", "binary")
output.Set("Expires", "0")
output.Set("Cache-Control", "must-revalidate")
output.Set("Pragma", "public")
http.ServeFile(res, res.ctx.request, file)
}
// Redirect does redirection response to url string and status int optional.
func (res *Response) Redirect(url string, status ...int) {
res.Headers["Location"] = url
if len(status) > 0 {
res.Status = status[0]
return
}
res.Status = http.StatusFound
}