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render.go
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render.go
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package render
import (
"encoding/json"
"net/http"
)
const (
charsetUTF8 = "charset=UTF-8"
ContentType = "Content-Type"
ContentTypeText = "text/plain"
ContentTypeTextCharsetUTF8 = ContentTypeText + "; " + charsetUTF8
ContentTypeHTML = "text/html"
ContentTypeHTMLCharsetUTF8 = ContentTypeHTML + "; " + charsetUTF8
ContentTypeXML = "application/xml"
ContentTypeXMLCharsetUTF8 = ContentTypeXML + "; " + charsetUTF8
ContentTypeJSON = "application/json"
ContentTypeJSONCharsetUTF8 = ContentTypeJSON + "; " + charsetUTF8
ContentTypeJSONP = "application/javascript"
ContentTypeJSONPCharsetUTF8 = ContentTypeJSONP + "; " + charsetUTF8
ContentTypeMultipartForm = "multipart/form-data"
)
func writeContentType(w http.ResponseWriter, v string) {
header := w.Header()
if header.Get(ContentType) == "" {
header.Set(ContentType, v)
}
}
func Blob(w http.ResponseWriter, code int, contentType string, data []byte) (err error) {
writeContentType(w, contentType)
if code > 0 {
w.WriteHeader(code)
}
if len(data) > 0 {
_, err = w.Write(data)
}
return
}
func Bytes(w http.ResponseWriter, code int, data []byte) error {
return Blob(w, code, ContentTypeTextCharsetUTF8, data)
}
func Text(w http.ResponseWriter, code int, data string) error {
return Blob(w, code, ContentTypeTextCharsetUTF8, []byte(data))
}
func HTML(w http.ResponseWriter, code int, data string) error {
return Blob(w, code, ContentTypeHTMLCharsetUTF8, []byte(data))
}
func JSON(w http.ResponseWriter, code int, data interface{}) error {
writeContentType(w, ContentTypeJSONCharsetUTF8)
if code > 0 {
w.WriteHeader(code)
}
return json.NewEncoder(w).Encode(data)
}
func JSONP(w http.ResponseWriter, code int, callback string, data interface{}) (err error) {
writeContentType(w, ContentTypeJSONPCharsetUTF8)
if code > 0 {
w.WriteHeader(code)
}
if _, err = w.Write([]byte(callback + "(")); err != nil {
return err
}
if err = json.NewEncoder(w).Encode(data); err != nil {
return err
}
_, err = w.Write([]byte(");"))
return err
}
func XML(w http.ResponseWriter, code int, data interface{}) error {
writeContentType(w, ContentTypeJSONCharsetUTF8)
if code > 0 {
w.WriteHeader(code)
}
return json.NewEncoder(w).Encode(data)
}