购买Google Play应用内结算版本3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验证服务器上的应用内结算购买的直接答案.

我在app-billing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,花花公子,购买成功完成,我得到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"
}

据我所知,我需要传递purchaseToken和我看到的称为服务器签名的东西.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,是否真的没有关于购买的服务器端验证的体面文档？

Answer 1

where do I get the signature from ?

看看官方文档,

它表示在您的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();
          }
      }
   }
}

要在服务器端验证, 请查看官方文档

正如前面提到的,客户端应用程序将发送sku和purchaseToken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GET请求:

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

这里,
packageName =客户端app的
productName productId =从客户端app收到的sku
令牌=从客户端app收到的purchaseToken

JSONObject如上所述,它将导致响应:

{
  "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

我希望它会有所帮助!!

Answer 2

我对减少应用内购买欺诈的小贡献

外部服务器上的签名验证，在您的 Android 代码上：

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() : "";
    }

虚拟主机根目录下的verify.php

<?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);

?>

笔记：

• 您应该在您的 java 代码中加密 URL，如果没有，可以通过在解压缩的应用程序 apk 中的简单文本搜索轻松找到该 URL

• 也最好将 php 文件名、url 参数、好/坏响应更改为毫无意义的东西。

• 如果不会抛出主线程上的网络异常，则 verifySignatureOnServer() 应在单独的线程中运行。

希望它会有所帮助...