add gowiki
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This is a simple wiki created in Go following an official guide from the Go developers.
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https://golang.org/doc/articles/wiki/
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<h1>Editing {{.Title}}</h1>
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<form action="/save/{{.Title}}" method="POST">
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<div><textarea name="body" rows="20" cols="80">{{printf "%s" .Body}}</textarea></div>
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<div><input type="submit" value="Save"></div>
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</form>
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module example.com/gowiki
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go 1.17
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<h1>{{.Title}}</h1>
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<p>[<a href="/edit/{{.Title}}">edit</a>]</p>
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<div>{{printf "%s" .Body}}</div>
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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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"log"
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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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var templates = template.Must(template.ParseFiles("edit.html", "view.html"))
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var validPath = regexp.MustCompile("^/(edit|save|view)/([a-zA-Z0-9]+)$")
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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 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 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 renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
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err := templates.ExecuteTemplate(w, tmpl+".html", 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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func makeHandler(fn func(http.ResponseWriter, *http.Request, string)) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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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
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}
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fn(w, r, m[2])
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}
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}
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func viewHandler(w http.ResponseWriter, r *http.Request, title string) {
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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, title string) {
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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, title string) {
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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 main() {
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http.HandleFunc("/view/", makeHandler(viewHandler))
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http.HandleFunc("/edit/", makeHandler(editHandler))
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http.HandleFunc("/save/", makeHandler(saveHandler))
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log.Fatal(http.ListenAndServe(":8173", nil))
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}
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