/
wiki.go
99 lines (91 loc) · 2.48 KB
/
wiki.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
package main
import (
"regexp"
"flag"
"io/ioutil"
"os"
"http"
"template"
)
type Page struct {
Title string
Body []byte // []byte and not string because io libs work on bytes
}
var templates = make(map[string]*template.Template)
func init () {
for _, tmpl := range []string{"edit", "view"} {
templates[tmpl] = template.MustParseFile("templates/"+tmpl+".html", nil)
}
}
func (p *Page) save() os.Error {
// We're passing the return value of WriteFile which has type 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) // err stores os.Error from ReadFile
if err != nil {
return nil, err
}
return &Page{Title: title, Body:body}, nil
}
const lenPath = len("/view/")
var port = flag.String("port", "2048", "TCP port for inbound connections")
func viewHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
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 := r.URL.Path[len("/edit/"):]
p, err := loadPage(title)
if err != nil {
p = &Page{Title: title}
}
renderTemplate(w, "edit", p)
}
func saveHandler(w http.ResponseWriter, r *http.Request) {
// title := r.URL.Path[lenPath:]
title, err := getTitle(w, r)
if err != nil {
return
}
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) {
err := templates[tmpl].Execute(w,p)
if err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)
}
}
var titleValidator = regexp.MustCompile("^[a-zA-Z0-9]+$")
func getTitle(w http.ResponseWriter, r *http.Request) (title string, err os.Error) {
title = r.URL.Path[lenPath:]
if !titleValidator.MatchString(title) {
http.NotFound(w, r)
err = os.NewError("Invalid Page Title")
}
return
}
func main() {
// p1 := &Page{Title: "TestPage", Body: []byte("I'm a test page.")}
// p1.save()
// p2, _ := loadPage("TestPage")
flag.Parse()
http.HandleFunc("/view/", viewHandler)
http.HandleFunc("/edit/", editHandler)
http.HandleFunc("/save/", saveHandler)
http.ListenAndServe(":" + *port, nil)
}