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/
favorite.go
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/
favorite.go
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// Copyright Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package backend
import (
"net/http"
"strconv"
"time"
)
const (
AMP_FAVORITE_COOKIE = "amp-favorite"
AMP_FAVORITE_COUNT_COOKIE = "amp-favorite-with-count"
)
func InitFavoriteSample() {
RegisterHandler("/favorite", handleFavorite)
RegisterHandler("/favorite-with-count", handleFavoriteWithCount)
}
func handleFavorite(w http.ResponseWriter, r *http.Request) {
SetMaxAge(w, 0)
if r.Method == "POST" {
setFavorite(w, r)
} else if r.Method == "GET" {
getFavorite(w, r)
}
}
func getFavorite(w http.ResponseWriter, r *http.Request) {
favorite := readFavoriteFromCookie(r, AMP_FAVORITE_COOKIE)
SendJsonResponse(w, favorite)
}
func setFavorite(w http.ResponseWriter, r *http.Request) {
favorite := !readFavoriteFromCookie(r, AMP_FAVORITE_COOKIE)
writeFavoriteCookie(w, r, AMP_FAVORITE_COOKIE, favorite)
SendJsonResponse(w, favorite)
}
func handleFavoriteWithCount(w http.ResponseWriter, r *http.Request) {
SetMaxAge(w, 0)
if r.Method == "POST" {
setFavoriteWithCount(w, r)
} else if r.Method == "GET" {
getFavoriteWithCount(w, r)
}
}
func getFavoriteWithCount(w http.ResponseWriter, r *http.Request) {
favorite := readFavoriteFromCookie(r, AMP_FAVORITE_COUNT_COOKIE)
writeFavoriteWithCount(w, favorite)
}
func setFavoriteWithCount(w http.ResponseWriter, r *http.Request) {
favorite := !readFavoriteFromCookie(r, AMP_FAVORITE_COUNT_COOKIE)
writeFavoriteCookie(w, r, AMP_FAVORITE_COUNT_COOKIE, favorite)
writeFavoriteWithCount(w, favorite)
}
func writeFavoriteWithCount(w http.ResponseWriter, favorite bool) {
var count int
if favorite {
count = 124
} else {
count = 123
}
SendJsonResponse(w, map[string]interface{}{
"value": favorite,
"count": count,
})
}
func writeFavoriteCookie(w http.ResponseWriter, r *http.Request, name string, value bool) {
expireInOneYear := time.Now().AddDate(1, 0, 0)
cookie := &http.Cookie{
Name: name,
Expires: expireInOneYear,
Value: strconv.FormatBool(value),
}
http.SetCookie(w, cookie)
}
func readFavoriteFromCookie(r *http.Request, name string) bool {
cookie, err := r.Cookie(name)
if err != nil {
return false
}
favorite, err := strconv.ParseBool(cookie.Value)
if err != nil {
return false
}
return favorite
}