mirror of
https://github.com/golang/go
synced 2024-11-25 07:47:56 -07:00
98 lines
2.2 KiB
Go
98 lines
2.2 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"io/ioutil"
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"net/http"
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"regexp"
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"text/template"
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)
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type Page struct {
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Title string
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Body []byte
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}
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func (p *Page) save() error {
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filename := p.Title + ".txt"
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return ioutil.WriteFile(filename, p.Body, 0600)
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}
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func loadPage(title string) (*Page, error) {
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filename := title + ".txt"
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body, err := ioutil.ReadFile(filename)
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if err != nil {
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return nil, err
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}
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return &Page{Title: title, Body: body}, nil
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}
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func viewHandler(w http.ResponseWriter, r *http.Request, title string) {
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p, err := loadPage(title)
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if err != nil {
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http.Redirect(w, r, "/edit/"+title, http.StatusFound)
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return
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}
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renderTemplate(w, "view", p)
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}
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func editHandler(w http.ResponseWriter, r *http.Request, title string) {
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p, err := loadPage(title)
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if err != nil {
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p = &Page{Title: title}
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}
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renderTemplate(w, "edit", p)
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}
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func saveHandler(w http.ResponseWriter, r *http.Request, title string) {
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body := r.FormValue("body")
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p := &Page{Title: title, Body: []byte(body)}
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err := p.save()
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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http.Redirect(w, r, "/view/"+title, http.StatusFound)
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}
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var templates = make(map[string]*template.Template)
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func init() {
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for _, tmpl := range []string{"edit", "view"} {
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t := template.Must(template.ParseFiles(tmpl + ".html"))
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templates[tmpl] = t
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}
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}
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func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
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err := templates[tmpl].Execute(w, p)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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}
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const lenPath = len("/view/")
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var titleValidator = regexp.MustCompile("^[a-zA-Z0-9]+$")
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func makeHandler(fn func(http.ResponseWriter, *http.Request, string)) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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title := r.URL.Path[lenPath:]
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if !titleValidator.MatchString(title) {
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http.NotFound(w, r)
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return
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}
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fn(w, r, title)
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}
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}
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func main() {
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http.HandleFunc("/view/", makeHandler(viewHandler))
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http.HandleFunc("/edit/", makeHandler(editHandler))
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http.HandleFunc("/save/", makeHandler(saveHandler))
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http.ListenAndServe(":8080", nil)
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}
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