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checkout.go
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checkout.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 (
"fmt"
"net/http"
)
const SHOPPING_CART_TOTAL = 9.94
var discounts map[string]float32
func InitCheckout() {
RegisterHandler("/checkout/shopping-cart", handleShoppingCart)
RegisterHandler("/checkout/apply-code", handleApplyCode)
discounts = make(map[string]float32)
}
func handleApplyCode(w http.ResponseWriter, r *http.Request) {
SetMaxAge(w, 0)
if r.Method == "POST" {
clientId := r.FormValue("clientId")
discounts[clientId] = 0.2
writeShoppingCart(w, r, clientId)
}
}
func handleShoppingCart(w http.ResponseWriter, r *http.Request) {
SetMaxAge(w, 0)
if r.Method == "GET" {
clientId := r.URL.Query().Get("clientId")
writeShoppingCart(w, r, clientId)
}
}
func writeShoppingCart(w http.ResponseWriter, r *http.Request, clientId string) {
discount := discounts[clientId]
total := SHOPPING_CART_TOTAL - SHOPPING_CART_TOTAL*discount
cart := createShoppingCart()
cart["total"] = fmt.Sprintf("%.2f", total)
if discount > 0 {
cart["discount"] = fmt.Sprintf("%g%%", (discount * 100))
}
SendJsonResponse(w, cart)
}
func createShoppingCart() map[string]interface{} {
return map[string]interface{}{
"items": []interface{}{
map[string]interface{}{
"name": "Item 1",
"price": "1.99",
"quantity": "2",
},
map[string]interface{}{
"name": "Item 2",
"price": "2.99",
"quantity": "1",
},
map[string]interface{}{
"name": "Item 3",
"price": "0.99",
"quantity": "3",
},
},
}
}