github.com/stingnevermore/go@v0.0.0-20180120041312-3810f5bfed72/doc/articles/wiki/final-template.go (about)

     1  // Copyright 2010 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import (
     8  	"html/template"
     9  	"io/ioutil"
    10  	"log"
    11  	"net/http"
    12  )
    13  
    14  type Page struct {
    15  	Title string
    16  	Body  []byte
    17  }
    18  
    19  func (p *Page) save() error {
    20  	filename := p.Title + ".txt"
    21  	return ioutil.WriteFile(filename, p.Body, 0600)
    22  }
    23  
    24  func loadPage(title string) (*Page, error) {
    25  	filename := title + ".txt"
    26  	body, err := ioutil.ReadFile(filename)
    27  	if err != nil {
    28  		return nil, err
    29  	}
    30  	return &Page{Title: title, Body: body}, nil
    31  }
    32  
    33  func editHandler(w http.ResponseWriter, r *http.Request) {
    34  	title := r.URL.Path[len("/edit/"):]
    35  	p, err := loadPage(title)
    36  	if err != nil {
    37  		p = &Page{Title: title}
    38  	}
    39  	renderTemplate(w, "edit", p)
    40  }
    41  
    42  func viewHandler(w http.ResponseWriter, r *http.Request) {
    43  	title := r.URL.Path[len("/view/"):]
    44  	p, _ := loadPage(title)
    45  	renderTemplate(w, "view", p)
    46  }
    47  
    48  func saveHandler(w http.ResponseWriter, r *http.Request) {
    49  	title := r.URL.Path[len("/save/"):]
    50  	body := r.FormValue("body")
    51  	p := &Page{Title: title, Body: []byte(body)}
    52  	p.save()
    53  	http.Redirect(w, r, "/view/"+title, http.StatusFound)
    54  }
    55  
    56  func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
    57  	t, _ := template.ParseFiles(tmpl + ".html")
    58  	t.Execute(w, p)
    59  }
    60  
    61  func main() {
    62  	http.HandleFunc("/view/", viewHandler)
    63  	http.HandleFunc("/edit/", editHandler)
    64  	http.HandleFunc("/save/", saveHandler)
    65  	log.Fatal(http.ListenAndServe(":8080", nil))
    66  }