Google Play In-app billing 版本 3 购买的服务器端验证

Question

在向用户提供可下载内容之前，我无法找到关于如何在服务器上验证应用内结算购买的直接答案。

我在应用计费版本 3 中使用。我使用基于 TrivialDrive 示例代码中的 IabHelper 类的代码购买托管产品。一切都很好，购买成功完成，我得到了一个完整的购买对象和以下原始 JSON 数据：

{
    "orderId":"12999763169054705758.1364365967744519",
    "packageName":"my package name",
    "productId":"77",
    "purchaseTime":1366217534000,
    "purchaseState":0,
    "purchaseToken":"utfwimslnrrwvglktizikdcd.AO-J1OwZ4l5oXz_3d2SAWAAUgFE3QErKoyIX8WuSEnBW26ntsyDmlLgoUd5lshqIY2p2LnlV4tpH4NITB4mJMX98sCtZizH7wGf6Izw3tfW_GflJDKFyb-g"
}

据我了解，我需要将 purchaseToken 和我看到的称为签名的东西传递给服务器。然后服务器使用私钥来验证购买。它是否正确？如果是这样，我从哪里获得签名？真的没有关于服务器端购买验证的像样文档吗？

Answer 1

1.用composer安装谷歌客户端PHP库

composer require google/apiclient:"^2.0"

1. 创建服务帐户，它会为您提供 json 并保存为 credentials.json

1. 开始代码

   require $_SERVER['DOCUMENT_ROOT'] . '/client/vendor/autoload.php';
   
   $packageName='Your Package name'; //com.example.blahblah
   $productId='your_product_ID';
   $token='Purchase_Token_Form_Payment';
   
   $client = new \Google_Client();
   $client->setAuthConfig('credentials.json');
   $client->addScope('https://www.googleapis.com/auth/androidpublisher');
   
   $service = new \Google_Service_AndroidPublisher($client);
   $purchase = $service->purchases_products->get($packageName, $productId, $token);
   
   //echo $purchase['purchaseState'];
   //echo '<br>';
   echo json_encode($purchase);
   

结果会是这样的

{"acknowledgementState":1,"consumptionState":1,"developerPayload":"","kind":"androidpublisher#productPurchase","orderId":"GPA.3342-8146-5668-57982","productId":null,"purchaseState":0,"purchaseTimeMillis":"1586978561493","purchaseToken":null,"purchaseType":0,"quantity":null}

Answer 2

这是一个非常古老的问题，但我认为它仍然相关。

我的小贡献。购买对象扩展了一个新参数“已确认”，现在它看起来：

{
  "orderId":"12999763169054705758.1364365967744519",
  "packageName":"my package name",
  "productId":"77",
  "purchaseTime":1366217534000,
  "purchaseState":0,
  "purchaseToken":"utfwimslnrrwvglktizikdcd.AO-J1OwZ4l5oXz_3d2SAWAAUgFE3QErKoyIX8WuSEnBW26ntsyDmlLgoUd5lshqIY2p2LnlV4tpH4NITB4mJMX98sCtZizH7wGf6Izw3tfW_GflJDKFyb-g",
  "acknowledged":true
}

所以在检查签名时要小心添加这个额外的参数。

Answer 3

我对减少应用内购买欺诈的小小贡献

在您的 Android 代码上的外部服务器上进行签名验证：

verifySignatureOnServer()

  private boolean verifySignatureOnServer(String data, String signature) {
        String retFromServer = "";
        URL url;
        HttpsURLConnection urlConnection = null;
        try {
            String urlStr = "https://www.example.com/verify.php?data=" + URLEncoder.encode(data, "UTF-8") + "&signature=" + URLEncoder.encode(signature, "UTF-8");

            url = new URL(urlStr);
            urlConnection = (HttpsURLConnection) url.openConnection();
            InputStream in = urlConnection.getInputStream();
            InputStreamReader inRead = new InputStreamReader(in);
            retFromServer = convertStreamToString(inRead);

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (urlConnection != null) {
                urlConnection.disconnect();
            }
        }

        return retFromServer.equals("good");
    }

convertStreamToString()

 private static String convertStreamToString(java.io.InputStreamReader is) {
        java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A");
        return s.hasNext() ? s.next() : "";
    }

verify.php在虚拟主机的根目录

<?php
// get data param
$data = $_GET['data'];

// get signature param
$signature = $_GET['signature'];

// get key
$key_64 = ".... put here the base64 encoded pub key from google play console , all in one row !! ....";



$key =  "-----BEGIN PUBLIC KEY-----\n".
        chunk_split($key_64, 64,"\n").
       '-----END PUBLIC KEY-----';   
//using PHP to create an RSA key
$key = openssl_get_publickey($key);


// state whether signature is okay or not
$ok = openssl_verify($data, base64_decode($signature), $key, OPENSSL_ALGO_SHA1);
if ($ok == 1) {
    echo "good";
} elseif ($ok == 0) {
    echo "bad";
} else {
    die ("fault, error checking signature");
}

// free the key from memory
openssl_free_key($key);

?>

注意事项：

• 您应该在您的 java 代码中加密 URL，如果没有，可以在您的解压缩应用程序 apk 中通过简单的文本搜索轻松找到该 URL

• 最好将 php 文件名、url 参数、好/坏响应更改为毫无意义的内容。

• verifySignatureOnServer() 应该在一个单独的线程中运行，如果不会抛出主线程上的网络异常。

希望对你有所帮助...

Answer 4

where do I get the signature from ?

看看official docs，

它说在您的onActivityResult() 方法中，您可以获得以下数据，如示例所示，

    @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
   if (requestCode == 1001) {           
      int responseCode = data.getIntExtra("RESPONSE_CODE", 0);
      String purchaseData = data.getStringExtra("INAPP_PURCHASE_DATA");
      String dataSignature = data.getStringExtra("INAPP_DATA_SIGNATURE");//this is the signature which you want

      if (resultCode == RESULT_OK) {
         try {
            JSONObject jo = new JSONObject(purchaseData);//this is the JSONObject which you have included in Your Question right now
            String sku = jo.getString("productId");
            String purchaseToken = jo.getString("purchaseToken");
           //you need to send sku and purchaseToken to server for verification
          }
          catch (JSONException e) {
             alert("Failed to parse purchase data.");
             e.printStackTrace();
          }
      }
   }
}

用于服务器端验证， 看看official docs

如前所述，客户端应用程序会将sku 和purchaseToken 发送到服务器API。服务器必须接收这些值，并且必须使用 android publish api 执行检查以验证购买：

服务器可以通过添加必要的参数来调用以下GET请求：

https://www.googleapis.com/androidpublisher/v2/applications/packageName/purchases/products/productId/tokens/token

这里，
packageName = 客户端应用程序的 packageName
productId = 从客户端应用收到的 sku
token = 从客户端应用收到的 purchaseToken

这将导致JSONObject 响应格式：

{
  "kind": "androidpublisher#productPurchase",
  "purchaseTimeMillis": long,
  "purchaseState": integer,
  "consumptionState": integer,
  "developerPayload": string,
  "orderId": string,
  "purchaseType": integer
}

这里，purchaseState = 0 表示有效购买

希望对你有帮助！！

Answer 5

这个问题太老了，但我希望我的回答可以帮助别人。

您必须在客户端验证签名，然后您必须将purchaseToken传递给服务器端，然后服务器将联系Google的服务器 并获取有关购买的所有必要信息，例如purchaseState 和consumptionState。

https://developers.google.com/android-publisher/api-ref/purchases/products