Esempio n. 1
0
// mainHandler tracks how many times each user has visited this page.
func mainHandler(w http.ResponseWriter, r *http.Request) *appError {
	if r.URL.Path != "/" {
		http.NotFound(w, r)
		return nil
	}

	ctx := appengine.NewContext(r)
	u := user.Current(ctx)
	if u == nil {
		login, err := user.LoginURL(ctx, r.URL.String())
		if err != nil {
			return &appError{err, "Error finding login URL", http.StatusInternalServerError}
		}
		http.Redirect(w, r, login, http.StatusFound)
		return nil
	}
	logoutURL, err := user.LogoutURL(ctx, "/")
	if err != nil {
		return &appError{err, "Error finding logout URL", http.StatusInternalServerError}
	}

	// Display hello page.
	tbl := client.Open(tableName)
	rmw := bigtable.NewReadModifyWrite()
	rmw.Increment(familyName, u.Email, 1)
	row, err := tbl.ApplyReadModifyWrite(ctx, u.Email, rmw)
	if err != nil {
		return &appError{err, "Error applying ReadModifyWrite to row: " + u.Email, http.StatusInternalServerError}
	}
	data := struct {
		Username, Logout string
		Visits           uint64
	}{
		Username: u.Email,
		// Retrieve the most recently edited column.
		Visits: binary.BigEndian.Uint64(row[familyName][0].Value),
		Logout: logoutURL,
	}
	var buf bytes.Buffer
	if err := tmpl.Execute(&buf, data); err != nil {
		return &appError{err, "Error writing template", http.StatusInternalServerError}
	}
	buf.WriteTo(w)
	return nil
}
Esempio n. 2
0
func handleMainPage(w http.ResponseWriter, r *http.Request) {
	if r.Method != "GET" {
		http.Error(w, "GET requests only", http.StatusMethodNotAllowed)
		return
	}
	if r.URL.Path != "/" {
		http.NotFound(w, r)
		return
	}

	ctx := appengine.NewContext(r)
	tic := time.Now()
	q := datastore.NewQuery("Greeting").Ancestor(guestbookKey(ctx)).Order("-Date").Limit(10)
	var gg []*Greeting
	if _, err := q.GetAll(ctx, &gg); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		log.Errorf(ctx, "GetAll: %v", err)
		return
	}
	log.Infof(ctx, "Datastore lookup took %s", time.Since(tic).String())
	log.Infof(ctx, "Rendering %d greetings", len(gg))

	var email, logout, login string
	if u := user.Current(ctx); u != nil {
		logout, _ = user.LogoutURL(ctx, "/")
		email = u.Email
	} else {
		login, _ = user.LoginURL(ctx, "/")
	}
	data := struct {
		Greetings            []*Greeting
		Login, Logout, Email string
	}{
		Greetings: gg,
		Login:     login,
		Logout:    logout,
		Email:     email,
	}
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := tpl.ExecuteTemplate(w, "guestbook.html", data); err != nil {
		log.Errorf(ctx, "%v", err)
	}
}
Esempio n. 3
0
func handleSign(w http.ResponseWriter, r *http.Request) {
	if r.Method != "POST" {
		http.Error(w, "POST requests only", http.StatusMethodNotAllowed)
		return
	}
	ctx := appengine.NewContext(r)
	g := &Greeting{
		Content: r.FormValue("content"),
		Date:    time.Now(),
	}
	if u := user.Current(ctx); u != nil {
		g.Author = u.String()
	}
	key := datastore.NewIncompleteKey(ctx, "Greeting", guestbookKey(ctx))
	if _, err := datastore.Put(ctx, key, g); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	// Redirect with 303 which causes the subsequent request to use GET.
	http.Redirect(w, r, "/", http.StatusSeeOther)
}
Esempio n. 4
0
func handle(w http.ResponseWriter, req *http.Request) {
	c := appengine.NewContext(req)

	u := user.Current(c)
	if u == nil {
		u, _ = user.CurrentOAuth(c,
			"https://www.googleapis.com/auth/cloud-platform",
			"https://www.googleapis.com/auth/appengine.apis",
		)
	}

	if u == nil || !u.Admin {
		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
		w.WriteHeader(http.StatusUnauthorized)
		io.WriteString(w, "You must be logged in as an administrator to access this.\n")
		return
	}
	if req.Header.Get("X-Appcfg-Api-Version") == "" {
		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
		w.WriteHeader(http.StatusForbidden)
		io.WriteString(w, "This request did not contain a necessary header.\n")
		return
	}

	if req.Method != "POST" {
		// Response must be YAML.
		rtok := req.FormValue("rtok")
		if rtok == "" {
			rtok = "0"
		}
		w.Header().Set("Content-Type", "text/yaml; charset=utf-8")
		fmt.Fprintf(w, `{app_id: %q, rtok: %q}`, internal.FullyQualifiedAppID(c), rtok)
		return
	}

	defer req.Body.Close()
	body, err := ioutil.ReadAll(req.Body)
	if err != nil {
		w.WriteHeader(http.StatusBadRequest)
		log.Errorf(c, "Failed reading body: %v", err)
		return
	}
	remReq := &pb.Request{}
	if err := proto.Unmarshal(body, remReq); err != nil {
		w.WriteHeader(http.StatusBadRequest)
		log.Errorf(c, "Bad body: %v", err)
		return
	}

	service, method := *remReq.ServiceName, *remReq.Method
	if !requestSupported(service, method) {
		w.WriteHeader(http.StatusBadRequest)
		log.Errorf(c, "Unsupported RPC /%s.%s", service, method)
		return
	}

	rawReq := &rawMessage{remReq.Request}
	rawRes := &rawMessage{}
	err = internal.Call(c, service, method, rawReq, rawRes)

	remRes := &pb.Response{}
	if err == nil {
		remRes.Response = rawRes.buf
	} else if ae, ok := err.(*internal.APIError); ok {
		remRes.ApplicationError = &pb.ApplicationError{
			Code:   &ae.Code,
			Detail: &ae.Detail,
		}
	} else {
		// This shouldn't normally happen.
		log.Errorf(c, "appengine/remote_api: Unexpected error of type %T: %v", err, err)
		remRes.ApplicationError = &pb.ApplicationError{
			Code:   proto.Int32(0),
			Detail: proto.String(err.Error()),
		}
	}
	out, err := proto.Marshal(remRes)
	if err != nil {
		// This should not be possible.
		w.WriteHeader(500)
		log.Errorf(c, "proto.Marshal: %v", err)
		return
	}

	log.Infof(c, "Spooling %d bytes of response to /%s.%s", len(out), service, method)
	w.Header().Set("Content-Type", "application/octet-stream")
	w.Header().Set("Content-Length", strconv.Itoa(len(out)))
	w.Write(out)
}