我已经在我的应用程序中实现了应用程序购买模块，我希望我的应用程序为用户执行自动续订订阅，因为我有很好的代码。
问题是，当我购买订阅时，谷歌播放向我发送了一个 notifyid，我通过它获取购买历史记录，但在该购买历史记录中，我得到购买响应“null”。有没有办法获得订阅的购买响应并让我知道自动续订订阅后谷歌播放如何通知我们。
我附上了下面的代码，我得到 JSON 格式的购买响应。
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.surfwise.inapppurchase.Constans.PurchaseState;
import com.surfwise.inapppurchase.util.Base64;
import com.surfwise.inapppurchase.util.Base64DecoderException;
import android.text.TextUtils;
import android.util.Log;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.SignatureException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;
import java.util.ArrayList;
import java.util.HashSet;
/**
* Security-related methods. For a secure implementation, all of this code
* should be implemented on a server that communicates with the application on
* the device. For the sake of simplicity and clarity of this example, this code
* is included here and is executed on the device. If you must verify the
* purchases on the phone, you should obfuscate this code to make it harder for
* an attacker to replace the code with stubs that treat all purchases as
* verified.
*/
public class Security {
private static final String TAG = "Security";
private static final String KEY_FACTORY_ALGORITHM = "RSA";
private static final String SIGNATURE_ALGORITHM = "SHA1withRSA";
private static final SecureRandom RANDOM = new SecureRandom();
/**
* This keeps track of the nonces that we generated and sent to the server.
* We need to keep track of these until we get back the purchase state and
* send a confirmation message back to Android Market. If we are killed and
* lose this list of nonces, it is not fatal. Android Market will send us a
* new "notify" message and we will re-generate a new nonce. This has to be
* "static" so that the {@link BillingReceiver} can check if a nonce exists.
*/
private static HashSet<Long> sKnownNonces = new HashSet<Long>();
/**
* A class to hold the verified purchase information.
*/
public static class VerifiedPurchase {
public PurchaseState purchaseState;
public String notificationId;
public String productId;
public String orderId;
public long purchaseTime;
public String developerPayload;
public String purchaseToken;
public VerifiedPurchase(PurchaseState purchaseState,
String notificationId, String productId, String orderId,
long purchaseTime, String developerPayload,String purchaseToken) {
this.purchaseState = purchaseState;
this.notificationId = notificationId;
this.productId = productId;
this.orderId = orderId;
this.purchaseTime = purchaseTime;
this.developerPayload = developerPayload;
this.purchaseToken=purchaseToken;
}
}
/** Generates a nonce (a random number used once). */
public static long generateNonce() {
long nonce = RANDOM.nextLong();
sKnownNonces.add(nonce);
return nonce;
}
public static void removeNonce(long nonce) {
sKnownNonces.remove(nonce);
}
public static boolean isNonceKnown(long nonce) {
return sKnownNonces.contains(nonce);
}
/**
* Verifies that the data was signed with the given signature, and returns
* the list of verified purchases. The data is in JSON format and contains a
* nonce (number used once) that we generated and that was signed (as part
* of the whole data string) with a private key. The data also contains the
* {@link PurchaseState} and product ID of the purchase. In the general
* case, there can be an array of purchase transactions because there may be
* delays in processing the purchase on the backend and then several
* purchases can be batched together.
*
* @param signedData
* the signed JSON string (signed, not encrypted)
* @param signature
* the signature for the data, signed with the private key
*/
public static ArrayList<VerifiedPurchase> verifyPurchase(String signedData,
String signature) {
if (signedData == null) {
//Log.e(TAG, "data is null");
return null;
}
if (Constans.DEBUG) {
//Log.i(TAG, "signedData: " + signedData);
}
boolean verified = false;
if (!TextUtils.isEmpty(signature)) {
/**
* Compute your public key (that you got from the Android Market
* publisher site).
*
* Instead of just storing the entire literal string here embedded
* in the program, construct the key at runtime from pieces or use
* bit manipulation (for example, XOR with some other string) to
* hide the actual key. The key itself is not secret information,
* but we don't want to make it easy for an adversary to replace the
* public key with one of their own and then fake messages from the
* server.
*
* Generally, encryption keys / passwords should only be kept in
* memory long enough to perform the operation they need to perform.
*/
String base64EncodedPublicKey = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuKgldGQPL/xV9WKLmY62UVgEm7gsPI/T/nQxRKpYN17m8Sq3gO9nWD17wXew4oNaHmMAmArS7s7eFi3Z+XiyWil1iZvEOdBOdZD502BzujPoBa4Fu9eITPBO9tzBEdvNLXf8amnsRj53TA4bcxB2O6OcXrQIv3t3n5Dg5Nn+rJpoKSNUv7NEzJagG/2NhyjIysAObbvQ5SBQ5NgRtZlvhsTeQJPMLhRAoRcTK/+47VkhrxM3PppeGjoNRryn6d+RhMjs/nydvoQtP2V76UcUu4m+daDnK3PxOnwLt50hNtQhNf3VgixVrSKfHUWp240uEz9MHstjj8BWPH9BFF/TewIDAQAB";
PublicKey key = Security.generatePublicKey(base64EncodedPublicKey);
verified = Security.verify(key, signedData, signature);
if (!verified) {
//Log.w(TAG, "signature does not match data.");
return null;
}
}
JSONObject jObject;
JSONArray jTransactionsArray = null;
int numTransactions = 0;
long nonce = 0L;
try {
jObject = new JSONObject(signedData);
// The nonce might be null if the user backed out of the buy page.
nonce = jObject.optLong("nonce");
jTransactionsArray = jObject.optJSONArray("orders");
if (jTransactionsArray != null) {
numTransactions = jTransactionsArray.length();
}
} catch (JSONException e) {
return null;
}
if (!Security.isNonceKnown(nonce)) {
//Log.w(TAG, "Nonce not found: " + nonce);
return null;
}
ArrayList<VerifiedPurchase> purchases = new ArrayList<VerifiedPurchase>();
try {
for (int i = 0; i < numTransactions; i++) {
JSONObject jElement = jTransactionsArray.getJSONObject(i);
System.out.println("response--------------->"+jElement);
int response = jElement.getInt("purchaseState");
PurchaseState purchaseState = PurchaseState.valueOf(response);
String productId = jElement.getString("productId");
String packageName = jElement.getString("packageName");
long purchaseTime = jElement.getLong("purchaseTime");
String orderId = jElement.optString("orderId","");
String notifyId = null;
String purchaseToken=jElement.optString("purchaseToken",null);
if (jElement.has("notificationId")) {
notifyId = jElement.getString("notificationId");
}
String developerPayload = jElement.optString(
"developerPayload",null);
// If the purchase state is PURCHASED, then we require a
// verified nonce.
if (purchaseState == PurchaseState.PURCHASED && !verified) {
continue;
}
purchases.add(new VerifiedPurchase(purchaseState, notifyId,
productId, orderId, purchaseTime, developerPayload,purchaseToken));
}
} catch (JSONException e) {
//Log.e(TAG, "JSON exception: ", e);
return null;
}
removeNonce(nonce);
return purchases;
}
/**
* Generates a PublicKey instance from a string containing the
* Base64-encoded public key.
*
* @param encodedPublicKey
* Base64-encoded public key
* @throws IllegalArgumentException
* if encodedPublicKey is invalid
*/
public static PublicKey generatePublicKey(String encodedPublicKey) {
try {
byte[] decodedKey = Base64.decode(encodedPublicKey);
KeyFactory keyFactory = KeyFactory
.getInstance(KEY_FACTORY_ALGORITHM);
return keyFactory
.generatePublic(new X509EncodedKeySpec(decodedKey));
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
} catch (InvalidKeySpecException e) {
//Log.e(TAG, "Invalid key specification.");
throw new IllegalArgumentException(e);
} catch (Base64DecoderException e) {
//Log.e(TAG, "Base64 decoding failed.");
throw new IllegalArgumentException(e);
}
}
/**
* Verifies that the signature from the server matches the computed
* signature on the data. Returns true if the data is correctly signed.
*
* @param publicKey
* public key associated with the developer account
* @param signedData
* signed data from server
* @param signature
* server signature
* @return true if the data and signature match
*/
public static boolean verify(PublicKey publicKey, String signedData,
String signature) {
if (Constans.DEBUG) {
//Log.i(TAG, "signature: " + signature);
}
Signature sig;
try {
sig = Signature.getInstance(SIGNATURE_ALGORITHM);
sig.initVerify(publicKey);
sig.update(signedData.getBytes());
if (!sig.verify(Base64.decode(signature))) {
//Log.e(TAG, "Signature verification failed.");
return false;
}
return true;
} catch (NoSuchAlgorithmException e) {
//Log.e(TAG, "NoSuchAlgorithmException.");
} catch (InvalidKeyException e) {
//Log.e(TAG, "Invalid key specification.");
} catch (SignatureException e) {
//Log.e(TAG, "Signature exception.");
} catch (Base64DecoderException e) {
//Log.e(TAG, "Base64 decoding failed.");
}
return false;
}
}