Adding Amazon IAP to the go-iap library

Fix the README by updating the amazon example

README.md

@@ -66,6 +66,19 @@ func main() {
 }
 ```
 
+### In App Purchase (via Amazon App Store)
+
+```
+import(
+    "github.com/dogenzaka/go-iap/amazon"
+)
+
+func main() {
+	client := amazon.New("developerSecret")
+
+	resp, err := client.Verify("userID", "receiptID")
+}
+```
 
 # ToDo
 - [x] Validator for In App Purchase Receipt (AppStore)
@@ -82,6 +95,9 @@ This validator supports the receipt type for iOS7 or above.
 ### In App Billing
 This validator uses [Version 3 API](http://developer.android.com/google/play/billing/api.html).
 
+### In App Purchase (Amazon)
+This validator uses [RVS for IAP v2.0](https://developer.amazon.com/public/apis/earn/in-app-purchasing/docs-v2/verifying-receipts-in-iap-2.0).
+
 
 # License
 go-iap is licensed under the MIT.

amazon/validator.go

@@ -0,0 +1,106 @@
+package amazon
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/parnurzeal/gorequest"
+)
+
+const (
+	SandboxURL    string = "http://localhost:8080/RVSSandbox"
+	ProductionURL string = "https://appstore-sdk.amazon.com"
+)
+
+// Config is a configuration to initialize client
+type Config struct {
+	IsProduction bool
+	Secret       string
+	TimeOut      time.Duration
+}
+
+// The IAPResponse type has the response properties
+type IAPResponse struct {
+	ReceiptID       string `json:"receiptId"`
+	ProductType     string `json:"productType"`
+	ProductID       string `json:"productId"`
+	PurchaseDate    int64  `json:"purchaseDate"`
+	CancelDate      int64  `json:"cancelDate"`
+	TestTransaction bool   `json:"testTransaction"`
+}
+
+type IAPResponseError struct {
+	Message string `json:"message"`
+	Status  bool   `json:"status"`
+}
+
+// IAPClient is an interface to call validation API in Amazon App Store
+type IAPClient interface {
+	Verify(string, string) (IAPResponse, error)
+}
+
+// Client implements IAPClient
+type Client struct {
+	URL     string
+	Secret  string
+	TimeOut time.Duration
+}
+
+// New creates a client object
+func New(secret string) IAPClient {
+	client := Client{
+		URL:     SandboxURL,
+		Secret:  secret,
+		TimeOut: time.Second * 5,
+	}
+	if os.Getenv("IAP_ENVIRONMENT") == "production" {
+		client.URL = ProductionURL
+	}
+	return client
+}
+
+// NewWithConfig creates a client with configuration
+func NewWithConfig(config Config) Client {
+	if config.TimeOut == 0 {
+		config.TimeOut = time.Second * 5
+	}
+
+	client := Client{
+		URL:     SandboxURL,
+		Secret:  config.Secret,
+		TimeOut: config.TimeOut,
+	}
+	if config.IsProduction {
+		client.URL = ProductionURL
+	}
+
+	return client
+}
+
+// Verify sends receipts and gets validation result
+func (c Client) Verify(userID string, receiptID string) (IAPResponse, error) {
+	result := IAPResponse{}
+	url := fmt.Sprintf("%v/version/1.0/verifyReceiptId/developer/%v/user/%v/receiptId/%v", c.URL, c.Secret, userID, receiptID)
+	res, body, errs := gorequest.New().
+		Get(url).
+		Timeout(c.TimeOut).
+		End()
+
+	if errs != nil {
+		return result, fmt.Errorf("%v", errs)
+	}
+
+	if res.StatusCode < 200 || res.StatusCode >= 300 {
+		responseError := IAPResponseError{}
+		json.NewDecoder(strings.NewReader(body)).Decode(&responseError)
+		return result, errors.New(responseError.Message)
+	}
+
+	err := json.NewDecoder(strings.NewReader(body)).Decode(&result)
+
+	return result, err
+}

amazon/validator_test.go

@@ -0,0 +1,169 @@
+package amazon
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"reflect"
+	"testing"
+	"time"
+)
+
+func TestHandle497Error(t *testing.T) {
+	var expected, actual error
+	client := New("developerSecret")
+
+	server, client := testTools(
+		497,
+		"{\"message\":\"Purchase token/app user mismatch\",\"status\":false}",
+	)
+	defer server.Close()
+
+	// status 400
+	expected = errors.New("Purchase token/app user mismatch")
+	_, actual = client.Verify(
+		"99FD_DL23EMhrOGDnur9-ulvqomrSg6qyLPSD3CFE=",
+		"q1YqVrJSSs7P1UvMTazKz9PLTCwoTswtyEktM9JLrShIzCvOzM-LL04tiTdW0lFKASo2NDEwMjCwMDM2MTC0AIqVAsUsLd1c4l18jIxdfTOK_N1d8kqLLHVLc8oK83OLgtPNCit9AoJdjJ3dXG2BGkqUrAxrAQ",
+	)
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("got %v\nwant %v", actual, expected)
+	}
+}
+
+func TestHandle400Error(t *testing.T) {
+	var expected, actual error
+	client := New("developerSecret")
+
+	server, client := testTools(
+		400,
+		"{\"message\":\"Failed to parse receipt Id\",\"status\":false}",
+	)
+	defer server.Close()
+
+	// status 400
+	expected = errors.New("Failed to parse receipt Id")
+	_, actual = client.Verify(
+		"99FD_DL23EMhrOGDnur9-ulvqomrSg6qyLPSD3CFE=",
+		"q1YqVrJSSs7P1UvMTazKz9PLTCwoTswtyEktM9JLrShIzCvOzM-LL04tiTdW0lFKASo2NDEwMjCwMDM2MTC0AIqVAsUsLd1c4l18jIxdfTOK_N1d8kqLLHVLc8oK83OLgtPNCit9AoJdjJ3dXG2BGkqUrAxrAQ",
+	)
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("got %v\nwant %v", actual, expected)
+	}
+}
+
+func TestNew(t *testing.T) {
+	expected := Client{
+		URL:     SandboxURL,
+		TimeOut: time.Second * 5,
+		Secret:  "developerSecret",
+	}
+
+	actual := New("developerSecret")
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("got %v\nwant %v", actual, expected)
+	}
+}
+
+func TestNewWithEnvironment(t *testing.T) {
+	expected := Client{
+		URL:     ProductionURL,
+		TimeOut: time.Second * 5,
+		Secret:  "developerSecret",
+	}
+
+	os.Setenv("IAP_ENVIRONMENT", "production")
+	actual := New("developerSecret")
+	os.Clearenv()
+
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("got %v\nwant %v", actual, expected)
+	}
+}
+
+func TestNewWithConfig(t *testing.T) {
+	config := Config{
+		IsProduction: true,
+		Secret:       "developerSecret",
+		TimeOut:      time.Second * 2,
+	}
+
+	expected := Client{
+		URL:     ProductionURL,
+		TimeOut: time.Second * 2,
+		Secret:  "developerSecret",
+	}
+
+	actual := NewWithConfig(config)
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("got %v\nwant %v", actual, expected)
+	}
+}
+
+func TestNewWithConfigTimeout(t *testing.T) {
+	config := Config{
+		IsProduction: true,
+		Secret:       "developerSecret",
+	}
+
+	expected := Client{
+		URL:     ProductionURL,
+		TimeOut: time.Second * 5,
+		Secret:  "developerSecret",
+	}
+
+	actual := NewWithConfig(config)
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("got %v\nwant %v", actual, expected)
+	}
+}
+
+func TestVerify(t *testing.T) {
+	server, client := testTools(
+		200,
+		"{\"purchaseDate\":1402008634018,\"receiptId\":\"q1YqVrJSSs7P1UvMTazKz9PLTCwoTswtyEktM9JLrShIzCvOzM-LL04tiTdW0lFKASo2NDEwMjCwMDM2MTC0AIqVAsUsLd1c4l18jIxdfTOK_N1d8kqLLHVLc8oK83OLgtPNCit9AoJdjJ3dXG2BGkqUrAxrAQ\",\"productId\":\"com.amazon.iapsamplev2.expansion_set_3\",\"parentProductId\":null,\"productType\":\"ENTITLED\",\"cancelDate\":null,\"quantity\":1,\"betaProduct\":false,\"testTransaction\":true}",
+	)
+	defer server.Close()
+
+	expected := IAPResponse{
+		ReceiptID:       "q1YqVrJSSs7P1UvMTazKz9PLTCwoTswtyEktM9JLrShIzCvOzM-LL04tiTdW0lFKASo2NDEwMjCwMDM2MTC0AIqVAsUsLd1c4l18jIxdfTOK_N1d8kqLLHVLc8oK83OLgtPNCit9AoJdjJ3dXG2BGkqUrAxrAQ",
+		ProductType:     "ENTITLED",
+		ProductID:       "com.amazon.iapsamplev2.expansion_set_3",
+		PurchaseDate:    1402008634018,
+		CancelDate:      0,
+		TestTransaction: true,
+	}
+
+	actual, _ := client.Verify(
+		"99FD_DL23EMhrOGDnur9-ulvqomrSg6qyLPSD3CFE=",
+		"q1YqVrJSSs7P1UvMTazKz9PLTCwoTswtyEktM9JLrShIzCvOzM-LL04tiTdW0lFKASo2NDEwMjCwMDM2MTC0AIqVAsUsLd1c4l18jIxdfTOK_N1d8kqLLHVLc8oK83OLgtPNCit9AoJdjJ3dXG2BGkqUrAxrAQ",
+	)
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("got %v\nwant %v", actual, expected)
+	}
+}
+
+func TestVerifyTimeout(t *testing.T) {
+	// HTTP 100 is "continue" so it will time out
+	server, client := testTools(100, "timeout response")
+	defer server.Close()
+
+	expected := errors.New("")
+	_, actual := client.Verify("timeout", "timeout")
+	if !reflect.DeepEqual(reflect.TypeOf(actual), reflect.TypeOf(expected)) {
+		t.Errorf("got %v\nwant %v", actual, expected)
+	}
+}
+
+func testTools(code int, body string) (*httptest.Server, *Client) {
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(code)
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprintln(w, body)
+	}))
+
+	client := &Client{URL: server.URL, TimeOut: time.Second * 2, Secret: "developerSecret"}
+	return server, client
+}