129 lines
2.8 KiB
Go
129 lines
2.8 KiB
Go
// Copyright 2014 Manu Martinez-Almeida. All rights reserved.
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// Use of this source code is governed by a MIT style
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// license that can be found in the LICENSE file.
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package render
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import (
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"encoding/json"
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"encoding/xml"
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"fmt"
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"html/template"
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"net/http"
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)
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type (
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Render interface {
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Render(http.ResponseWriter, int, ...interface{}) error
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}
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jsonRender struct{}
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indentedJSON struct{}
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xmlRender struct{}
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plainTextRender struct{}
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htmlPlainRender struct{}
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redirectRender struct{}
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HTMLRender struct {
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Template *template.Template
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}
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)
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var (
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JSON = jsonRender{}
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IndentedJSON = indentedJSON{}
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XML = xmlRender{}
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HTMLPlain = htmlPlainRender{}
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Plain = plainTextRender{}
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Redirect = redirectRender{}
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)
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func (_ redirectRender) Render(w http.ResponseWriter, code int, data ...interface{}) error {
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req := data[0].(*http.Request)
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location := data[1].(string)
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http.Redirect(w, req, location, code)
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return nil
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}
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func (_ jsonRender) Render(w http.ResponseWriter, code int, data ...interface{}) error {
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WriteHeader(w, code, "application/json")
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return json.NewEncoder(w).Encode(data[0])
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}
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func (_ indentedJSON) Render(w http.ResponseWriter, code int, data ...interface{}) error {
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WriteHeader(w, code, "application/json")
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jsonData, err := json.MarshalIndent(data[0], "", " ")
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if err != nil {
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return err
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}
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_, err = w.Write(jsonData)
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return err
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}
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func (_ xmlRender) Render(w http.ResponseWriter, code int, data ...interface{}) error {
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WriteHeader(w, code, "application/xml")
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return xml.NewEncoder(w).Encode(data[0])
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}
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func (_ plainTextRender) Render(w http.ResponseWriter, code int, data ...interface{}) (err error) {
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WriteHeader(w, code, "text/plain")
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format := data[0].(string)
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args := data[1].([]interface{})
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if len(args) > 0 {
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_, err = fmt.Fprintf(w, format, args...)
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} else {
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_, err = w.Write([]byte(format))
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}
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return
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}
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func (_ htmlPlainRender) Render(w http.ResponseWriter, code int, data ...interface{}) (err error) {
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WriteHeader(w, code, "text/html")
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format := data[0].(string)
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args := data[1].([]interface{})
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if len(args) > 0 {
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_, err = fmt.Fprintf(w, format, args...)
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} else {
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_, err = w.Write([]byte(format))
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}
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return
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}
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func (html HTMLRender) Render(w http.ResponseWriter, code int, data ...interface{}) error {
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WriteHeader(w, code, "text/html")
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file := data[0].(string)
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args := data[1]
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return html.Template.ExecuteTemplate(w, file, args)
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}
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func WriteHeader(w http.ResponseWriter, code int, contentType string) {
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contentType = joinStrings(contentType, "; charset=utf-8")
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w.Header().Set("Content-Type", contentType)
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w.WriteHeader(code)
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}
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func joinStrings(a ...string) string {
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if len(a) == 0 {
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return ""
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}
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if len(a) == 1 {
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return a[0]
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}
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n := 0
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for i := 0; i < len(a); i++ {
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n += len(a[i])
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}
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b := make([]byte, n)
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n = 0
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for _, s := range a {
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n += copy(b[n:], s)
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}
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return string(b)
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}
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