mirror of
https://codeberg.org/forgejo/forgejo.git
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289 lines
5.6 KiB
Go
289 lines
5.6 KiB
Go
// Copyright 2014 The Gogs Authors. 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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// foked from https://github.com/martini-contrib/render/blob/master/render.go
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package middleware
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"html/template"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"path/filepath"
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"time"
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"github.com/codegangsta/martini"
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"github.com/gogits/gogs/modules/base"
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)
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const (
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ContentType = "Content-Type"
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ContentLength = "Content-Length"
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ContentJSON = "application/json"
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ContentHTML = "text/html"
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ContentXHTML = "application/xhtml+xml"
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defaultCharset = "UTF-8"
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)
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var helperFuncs = template.FuncMap{
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"yield": func() (string, error) {
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return "", fmt.Errorf("yield called with no layout defined")
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},
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}
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type Delims struct {
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Left string
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Right string
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}
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type RenderOptions struct {
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Directory string
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Layout string
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Extensions []string
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Funcs []template.FuncMap
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Delims Delims
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Charset string
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IndentJSON bool
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HTMLContentType string
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}
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type HTMLOptions struct {
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Layout string
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}
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func Renderer(options ...RenderOptions) martini.Handler {
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opt := prepareOptions(options)
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cs := prepareCharset(opt.Charset)
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t := compile(opt)
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return func(res http.ResponseWriter, req *http.Request, c martini.Context) {
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var tc *template.Template
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if martini.Env == martini.Dev {
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tc = compile(opt)
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} else {
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tc, _ = t.Clone()
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}
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rd := &Render{res, req, tc, opt, cs, base.TmplData{}, time.Time{}}
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rd.Data["TmplLoadTimes"] = func() string {
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if rd.startTime.IsZero() {
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return ""
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}
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return fmt.Sprint(time.Since(rd.startTime).Nanoseconds()/1e6) + "ms"
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}
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c.Map(rd.Data)
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c.Map(rd)
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}
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}
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func prepareCharset(charset string) string {
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if len(charset) != 0 {
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return "; charset=" + charset
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}
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return "; charset=" + defaultCharset
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}
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func prepareOptions(options []RenderOptions) RenderOptions {
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var opt RenderOptions
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if len(options) > 0 {
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opt = options[0]
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}
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if len(opt.Directory) == 0 {
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opt.Directory = "templates"
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}
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if len(opt.Extensions) == 0 {
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opt.Extensions = []string{".tmpl"}
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}
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if len(opt.HTMLContentType) == 0 {
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opt.HTMLContentType = ContentHTML
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}
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return opt
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}
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func compile(options RenderOptions) *template.Template {
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dir := options.Directory
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t := template.New(dir)
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t.Delims(options.Delims.Left, options.Delims.Right)
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template.Must(t.Parse("Martini"))
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filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
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r, err := filepath.Rel(dir, path)
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if err != nil {
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return err
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}
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ext := filepath.Ext(r)
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for _, extension := range options.Extensions {
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if ext == extension {
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buf, err := ioutil.ReadFile(path)
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if err != nil {
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panic(err)
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}
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name := (r[0 : len(r)-len(ext)])
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tmpl := t.New(filepath.ToSlash(name))
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for _, funcs := range options.Funcs {
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tmpl.Funcs(funcs)
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}
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template.Must(tmpl.Funcs(helperFuncs).Parse(string(buf)))
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break
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}
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}
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return nil
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})
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return t
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}
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type Render struct {
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http.ResponseWriter
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req *http.Request
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t *template.Template
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opt RenderOptions
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compiledCharset string
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Data base.TmplData
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startTime time.Time
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}
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func (r *Render) JSON(status int, v interface{}) {
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var result []byte
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var err error
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if r.opt.IndentJSON {
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result, err = json.MarshalIndent(v, "", " ")
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} else {
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result, err = json.Marshal(v)
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}
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if err != nil {
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http.Error(r, err.Error(), 500)
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return
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}
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r.Header().Set(ContentType, ContentJSON+r.compiledCharset)
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r.WriteHeader(status)
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r.Write(result)
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}
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func (r *Render) JSONString(v interface{}) (string, error) {
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var result []byte
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var err error
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if r.opt.IndentJSON {
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result, err = json.MarshalIndent(v, "", " ")
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} else {
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result, err = json.Marshal(v)
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}
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if err != nil {
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return "", err
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}
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return string(result), nil
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}
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func (r *Render) renderBytes(name string, binding interface{}, htmlOpt ...HTMLOptions) (*bytes.Buffer, error) {
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opt := r.prepareHTMLOptions(htmlOpt)
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if len(opt.Layout) > 0 {
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r.addYield(name, binding)
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name = opt.Layout
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}
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out, err := r.execute(name, binding)
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if err != nil {
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return nil, err
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}
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return out, nil
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}
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func (r *Render) HTML(status int, name string, binding interface{}, htmlOpt ...HTMLOptions) {
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r.startTime = time.Now()
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out, err := r.renderBytes(name, binding, htmlOpt...)
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if err != nil {
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http.Error(r, err.Error(), http.StatusInternalServerError)
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return
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}
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r.Header().Set(ContentType, r.opt.HTMLContentType+r.compiledCharset)
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r.WriteHeader(status)
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io.Copy(r, out)
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}
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func (r *Render) HTMLString(name string, binding interface{}, htmlOpt ...HTMLOptions) (string, error) {
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if out, err := r.renderBytes(name, binding, htmlOpt...); err != nil {
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return "", err
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} else {
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return out.String(), nil
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}
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}
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func (r *Render) Error(status int, message ...string) {
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r.WriteHeader(status)
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if len(message) > 0 {
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r.Write([]byte(message[0]))
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}
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}
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func (r *Render) Redirect(location string, status ...int) {
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code := http.StatusFound
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if len(status) == 1 {
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code = status[0]
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}
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http.Redirect(r, r.req, location, code)
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}
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func (r *Render) Template() *template.Template {
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return r.t
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}
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func (r *Render) execute(name string, binding interface{}) (*bytes.Buffer, error) {
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buf := new(bytes.Buffer)
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return buf, r.t.ExecuteTemplate(buf, name, binding)
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}
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func (r *Render) addYield(name string, binding interface{}) {
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funcs := template.FuncMap{
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"yield": func() (template.HTML, error) {
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buf, err := r.execute(name, binding)
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return template.HTML(buf.String()), err
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},
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}
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r.t.Funcs(funcs)
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}
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func (r *Render) prepareHTMLOptions(htmlOpt []HTMLOptions) HTMLOptions {
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if len(htmlOpt) > 0 {
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return htmlOpt[0]
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}
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return HTMLOptions{
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Layout: r.opt.Layout,
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}
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}
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