// Copyright 2010 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package main import ( "flag" "html/template" "io/ioutil" "log" "net" "net/http" "regexp" ) var ( addr = flag.Bool("addr", false, "find open address and print to final-port.txt") ) type Page struct { Title string Body []byte } func (p *Page) save() error { filename := p.Title + ".txt" return ioutil.WriteFile(filename, p.Body, 0600) } func loadPage(title string) (*Page, error) { filename := title + ".txt" body, err := ioutil.ReadFile(filename) if err != nil { return nil, err } return &Page{Title: title, Body: body}, nil } func viewHandler(w http.ResponseWriter, r *http.Request, title string) { p, err := loadPage(title) if err != nil { http.Redirect(w, r, "/edit/"+title, http.StatusFound) return } renderTemplate(w, "view", p) } func editHandler(w http.ResponseWriter, r *http.Request, title string) { p, err := loadPage(title) if err != nil { p = &Page{Title: title} } renderTemplate(w, "edit", p) } func saveHandler(w http.ResponseWriter, r *http.Request, title string) { body := r.FormValue("body") p := &Page{Title: title, Body: []byte(body)} err := p.save() if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } http.Redirect(w, r, "/view/"+title, http.StatusFound) } var templates = template.Must(template.ParseFiles("edit.html", "view.html")) func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) { err := templates.ExecuteTemplate(w, tmpl+".html", p) if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) } } var validPath = regexp.MustCompile("^/(edit|save|view)/([a-zA-Z0-9]+)$") func makeHandler(fn func(http.ResponseWriter, *http.Request, string)) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { m := validPath.FindStringSubmatch(r.URL.Path) if m == nil { http.NotFound(w, r) return } fn(w, r, m[2]) } } func main() { flag.Parse() http.HandleFunc("/view/", makeHandler(viewHandler)) http.HandleFunc("/edit/", makeHandler(editHandler)) http.HandleFunc("/save/", makeHandler(saveHandler)) if *addr { l, err := net.Listen("tcp", "127.0.0.1:0") if err != nil { log.Fatal(err) } err = ioutil.WriteFile("final-port.txt", []byte(l.Addr().String()), 0644) if err != nil { log.Fatal(err) } s := &http.Server{} s.Serve(l) return } http.ListenAndServe(":8080", nil) }