package main import ( "http" "io/ioutil" "os" "regexp" "template" ) type page struct { title string body []byte } func (p *page) save() os.Error { filename := p.title + ".txt" return ioutil.WriteFile(filename, p.body, 0600) } func loadPage(title string) (*page, os.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.String(), http.StatusInternalServerError) return } http.Redirect(w, r, "/view/"+title, http.StatusFound) } func renderTemplate(w http.ResponseWriter, tmpl string, p *page) { t, err := template.ParseFile(tmpl+".html", nil) if err != nil { http.Error(w, err.String(), http.StatusInternalServerError) return } err = t.Execute(p, w) if err != nil { http.Error(w, err.String(), http.StatusInternalServerError) } } const lenPath = len("/view/") var titleValidator = regexp.MustCompile("^[a-zA-Z0-9]+$") func makeHandler(fn func(http.ResponseWriter, *http.Request, string)) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { title := r.URL.Path[lenPath:] if !titleValidator.MatchString(title) { http.NotFound(w, r) return } fn(w, r, title) } } func main() { http.HandleFunc("/view/", makeHandler(viewHandler)) http.HandleFunc("/edit/", makeHandler(editHandler)) http.HandleFunc("/save/", makeHandler(saveHandler)) http.ListenAndServe(":8080", nil) }