mirror of
https://github.com/golang/go
synced 2024-11-12 06:20:22 -07:00
101 lines
2.0 KiB
Go
101 lines
2.0 KiB
Go
package main
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import (
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"errors"
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"io/ioutil"
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"net/http"
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"regexp"
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"text/template"
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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.ParseFile(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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const lenPath = len("/view/")
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var titleValidator = regexp.MustCompile("^[a-zA-Z0-9]+$")
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func getTitle(w http.ResponseWriter, r *http.Request) (title string, err error) {
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title = r.URL.Path[lenPath:]
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if !titleValidator.MatchString(title) {
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http.NotFound(w, r)
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err = errors.New("Invalid Page Title")
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}
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return
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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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