forked from awa/go-iap
/
validator.go
165 lines (135 loc) · 5.15 KB
/
validator.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
package playstore
import (
"context"
"crypto"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"encoding/base64"
"fmt"
"net/http"
"time"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
androidpublisher "google.golang.org/api/androidpublisher/v2"
)
// The IABClient type is an interface to verify purchase token
type IABClient interface {
VerifySubscription(context.Context, string, string, string) (*androidpublisher.SubscriptionPurchase, error)
VerifyProduct(context.Context, string, string, string) (*androidpublisher.ProductPurchase, error)
CancelSubscription(context.Context, string, string, string) error
RefundSubscription(context.Context, string, string, string) error
RevokeSubscription(context.Context, string, string, string) error
}
// The Client type implements VerifySubscription method
type Client struct {
httpCli *http.Client
}
// New returns http client which includes the credentials to access androidpublisher API.
// You should create a service account for your project at
// https://console.developers.google.com and download a JSON key file to set this argument.
func New(jsonKey []byte) (*Client, error) {
ctx := context.WithValue(context.Background(), oauth2.HTTPClient, &http.Client{Timeout: 10 * time.Second})
conf, err := google.JWTConfigFromJSON(jsonKey, androidpublisher.AndroidpublisherScope)
return &Client{conf.Client(ctx)}, err
}
// NewWithClient returns http client which includes the custom http client.
func NewWithClient(jsonKey []byte, cli *http.Client) (*Client, error) {
ctx := context.WithValue(context.Background(), oauth2.HTTPClient, cli)
conf, err := google.JWTConfigFromJSON(jsonKey, androidpublisher.AndroidpublisherScope)
if err != nil {
return nil, err
}
return &Client{conf.Client(ctx)}, err
}
// VerifySubscription verifies subscription status
func (c *Client) VerifySubscription(
ctx context.Context,
packageName string,
subscriptionID string,
token string,
) (*androidpublisher.SubscriptionPurchase, error) {
service, err := androidpublisher.New(c.httpCli)
if err != nil {
return nil, err
}
ps := androidpublisher.NewPurchasesSubscriptionsService(service)
result, err := ps.Get(packageName, subscriptionID, token).Context(ctx).Do()
return result, err
}
// VerifyProduct verifies product status
func (c *Client) VerifyProduct(
ctx context.Context,
packageName string,
productID string,
token string,
) (*androidpublisher.ProductPurchase, error) {
service, err := androidpublisher.New(c.httpCli)
if err != nil {
return nil, err
}
ps := androidpublisher.NewPurchasesProductsService(service)
result, err := ps.Get(packageName, productID, token).Context(ctx).Do()
return result, err
}
// CancelSubscription cancels a user's subscription purchase.
func (c *Client) CancelSubscription(ctx context.Context, packageName string, subscriptionID string, token string) error {
service, err := androidpublisher.New(c.httpCli)
if err != nil {
return err
}
ps := androidpublisher.NewPurchasesSubscriptionsService(service)
err = ps.Cancel(packageName, subscriptionID, token).Context(ctx).Do()
return err
}
// RefundSubscription refunds a user's subscription purchase, but the subscription remains valid
// until its expiration time and it will continue to recur.
func (c *Client) RefundSubscription(ctx context.Context, packageName string, subscriptionID string, token string) error {
service, err := androidpublisher.New(c.httpCli)
if err != nil {
return err
}
ps := androidpublisher.NewPurchasesSubscriptionsService(service)
err = ps.Refund(packageName, subscriptionID, token).Context(ctx).Do()
return err
}
// RevokeSubscription refunds and immediately revokes a user's subscription purchase.
// Access to the subscription will be terminated immediately and it will stop recurring.
func (c *Client) RevokeSubscription(ctx context.Context, packageName string, subscriptionID string, token string) error {
service, err := androidpublisher.New(c.httpCli)
if err != nil {
return err
}
ps := androidpublisher.NewPurchasesSubscriptionsService(service)
err = ps.Revoke(packageName, subscriptionID, token).Context(ctx).Do()
return err
}
// VerifySignature verifies in app billing signature.
// You need to prepare a public key for your Android app's in app billing
// at https://play.google.com/apps/publish/
func VerifySignature(base64EncodedPublicKey string, receipt []byte, signature string) (isValid bool, err error) {
// prepare public key
decodedPublicKey, err := base64.StdEncoding.DecodeString(base64EncodedPublicKey)
if err != nil {
return false, fmt.Errorf("failed to decode public key")
}
publicKeyInterface, err := x509.ParsePKIXPublicKey(decodedPublicKey)
if err != nil {
return false, fmt.Errorf("failed to parse public key")
}
publicKey, _ := publicKeyInterface.(*rsa.PublicKey)
// generate hash value from receipt
hasher := sha1.New()
hasher.Write(receipt)
hashedReceipt := hasher.Sum(nil)
// decode signature
decodedSignature, err := base64.StdEncoding.DecodeString(signature)
if err != nil {
return false, fmt.Errorf("failed to decode signature")
}
// verify
if err := rsa.VerifyPKCS1v15(publicKey, crypto.SHA1, hashedReceipt, decodedSignature); err != nil {
return false, nil
}
return true, nil
}