mirror of
https://github.com/golang/go
synced 2024-11-18 04:14:49 -07:00
103 lines
2.2 KiB
Go
103 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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"errors"
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"html/template"
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"io/ioutil"
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"net/http"
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"regexp"
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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) {
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title, err := getTitle(w, r)
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if err != nil {
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return
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}
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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) {
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title, err := getTitle(w, r)
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if err != nil {
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return
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}
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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) {
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title, err := getTitle(w, r)
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if err != nil {
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return
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}
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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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func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
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t, err := template.ParseFiles(tmpl + ".html")
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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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err = t.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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var validPath = regexp.MustCompile("^/(edit|save|view)/([a-zA-Z0-9]+)$")
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func getTitle(w http.ResponseWriter, r *http.Request) (string, error) {
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m := validPath.FindStringSubmatch(r.URL.Path)
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if m == nil {
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http.NotFound(w, r)
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return "", errors.New("Invalid Page Title")
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}
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return m[2], nil // The title is the second subexpression.
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}
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func main() {
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http.HandleFunc("/view/", viewHandler)
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http.HandleFunc("/edit/", editHandler)
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http.HandleFunc("/save/", saveHandler)
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http.ListenAndServe(":8080", nil)
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}
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