mirror of
https://github.com/golang/go
synced 2024-11-25 09:27:57 -07:00
f56db6f534
The Set type is gone. Instead, templates are automatically associated by being parsed together; nested definitions implicitly create associations. Only associated templates can invoke one another. This approach dramatically reduces the breadth of the construction API. For now, html/template is deleted from src/pkg/Makefile, so this can be checked in. Nothing in the tree depends on it. It will be updated next. R=dsymonds, adg, rsc, r, gri, mikesamuel, nigeltao CC=golang-dev https://golang.org/cl/5415060
90 lines
2.0 KiB
Go
90 lines
2.0 KiB
Go
package main
|
|
|
|
import (
|
|
"io/ioutil"
|
|
"net/http"
|
|
"regexp"
|
|
"text/template"
|
|
)
|
|
|
|
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)
|
|
}
|
|
|
|
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
|
|
t, err := template.ParseFiles(tmpl+".html", nil)
|
|
if err != nil {
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
err = t.Execute(w, p)
|
|
if err != nil {
|
|
http.Error(w, err.Error(), 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)
|
|
}
|