我正在我的应用中实施应用内结算以解锁高级功能。 应用内结算功能设置正确。除了“开发者有效载荷”之外,一切似乎都很好。
示例应用说
/*
* TODO: verify that the developer payload of the purchase is correct. It will be
* the same one that you sent when initiating the purchase.
*
* WARNING: Locally generating a random string when starting a purchase and
* verifying it here might seem like a good approach, but this will fail in the
* case where the user purchases an item on one device and then uses your app on
* a different device, because on the other device you will not have access to the
* random string you originally generated.
*
* So a good developer payload has these characteristics:
*
* 1. If two different users purchase an item, the payload is different between them,
* so that one user's purchase can't be replayed to another user.
*
* 2. The payload must be such that you can verify it even when the app wasn't the
* one who initiated the purchase flow (so that items purchased by the user on
* one device work on other devices owned by the user).
*
* Using your own server to store and verify developer payloads across app
* installations is recommended.
*/
示例应用使用空字符串作为开发人员有效负载。我的问题是用作开发人员有效负载的字符串是什么? 我可以使用用户的主电子邮件ID吗?
答案 0 :(得分:2)
对我来说,随机字符串首先无用,它需要依赖于购买它的用户,而不是购买它的设备。其次,它是非消耗品,所以空字符串可能适合,但不是理想的。
所以我的方法是基于密钥创建加密的哈希。每次购买时,它都是唯一可识别的,因为散列应该永远不会相同(这取决于散列方法,例如bcrypt)。
由于所有设备上的密钥都相同,因此可以轻松解密并验证密码消息是否正确。
为了使密钥保持秘密,我使用了各种字符串操作函数来掩盖它,因此它不会以可见的方式存储。
可以在此处找到文本管理的示例:Android In App Billing: securing application public key
String Base64EncodedPublicKey key =
DecrementEachletter("Bl4kgle") + GetMiddleBit() + ReverseString("D349824");
这种基于密钥创建散列的方法允许有效载荷是唯一且可识别的,同时具有合理的安全性。它不是防弹的,但它确实很难破解。
答案 1 :(得分:1)
请检查以下答案,它可能会解决您的问题:
如果您使用耗材项目(托管项目),则可以使用随机生成的字符串
第1步:在创建方法之前声明:
private static final char[] symbols = new char[36];
static {
for (int idx = 0; idx < 10; ++idx)
symbols[idx] = (char) ('0' + idx);
for (int idx = 10; idx < 36; ++idx)
symbols[idx] = (char) ('a' + idx - 10);
}
第2步:在您的活动中设置RandomString和SessionIdentifierGenerator类
public class RandomString {
/*
* static { for (int idx = 0; idx < 10; ++idx) symbols[idx] = (char)
* ('0' + idx); for (int idx = 10; idx < 36; ++idx) symbols[idx] =
* (char) ('a' + idx - 10); }
*/
private final Random random = new Random();
private final char[] buf;
public RandomString(int length) {
if (length < 1)
throw new IllegalArgumentException("length < 1: " + length);
buf = new char[length];
}
public String nextString() {
for (int idx = 0; idx < buf.length; ++idx)
buf[idx] = symbols[random.nextInt(symbols.length)];
return new String(buf);
}
}
public final class SessionIdentifierGenerator {
private SecureRandom random = new SecureRandom();
public String nextSessionId() {
return new BigInteger(130, random).toString(32);
}
}
第3步:将有效负载传递到您的购买请求中:
RandomString randomString = new RandomString(36);
System.out.println("RandomString>>>>" + randomString.nextString());
/* String payload = ""; */
// bGoa+V7g/yqDXvKRqq+JTFn4uQZbPiQJo4pf9RzJ
String payload = randomString.nextString();
Log.e("Random generated Payload", ">>>>>" + payload);
Log.d(TAG, "Launching purchase flow for infinite gas subscription.");
mHelper.launchPurchaseFlow(this, SKU_GAS,
IabHelper.ITEM_TYPE_INAPP, RC_REQUEST,
mPurchaseFinishedListener, payload);
更多信息检查此链接: Token that identify the user
希望它能解决你的问题。