使用lambda通过Node.js进行iOS收据验证

本文介绍了使用lambda通过Node.js进行iOS收据验证的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在Swift中开发一个iOS应用，并尝试对应用内购买实施收据验证.我无法弄清楚如何在Swift中实现此目的，因此，我在这个问题.我的Swift代码如下:

I am developing an iOS app in Swift and attempting to implement receipt validation for an in-app purchase. I couldn't figure out how to achieve this in Swift, so instead I tried having my app send the request through a Lambda function writtin in Node.js, after seeing Giulio Roggero's example in this question. My Swift code looks like this:

let receiptPath = Bundle.main.appStoreReceiptURL?.path if FileManager.default.fileExists(atPath: receiptPath!){ var receiptData:NSData? do{ receiptData = try NSData(contentsOf: Bundle.main.appStoreReceiptURL!, options: NSData.ReadingOptions.alwaysMapped) } catch{ print("ERROR: " + error.localizedDescription) } let receiptString = receiptData?.base64EncodedString(options: .endLineWithLineFeed) let invocationRequest = AWSLambdaInvokerInvocationRequest() invocationRequest?.functionName = "sendReceiptRequest" invocationRequest?.invocationType = AWSLambdaInvocationType.requestResponse invocationRequest?.payload = ["receipt-data" : receiptString!, "password" : SUBSCRIPTION_SECRET] let lambdaInvoker = AWSLambdaInvoker.default() lock() lambdaInvoker.invoke(invocationRequest!).continue(with: AWSExecutor.mainThread(), with: { (task:AWSTask!) -> AnyObject! in if task.error != nil { self.sendErrorPopup("Error: \(task.error?.localizedDescription)") } else { print("TOKEN: ", task.result) } self.unlock() return nil })}

我的Lambda node.js函数如下例所示:

My Lambda node.js function looks like this, following the example:

function (receiptData_base64, password, production, cb) { var url = production ? 'buy.itunes.apple' : 'sandbox.itunes.apple' var receiptEnvelope = { "receipt-data": receiptData_base64, "password":password }; var receiptEnvelopeStr = JSON.stringify(receiptEnvelope); var options = { host: url, port: 443, path: '/verifyReceipt', method: 'POST', headers: { 'Content-Type': 'application/x-www-form-urlencoded', 'Content-Length': Buffer.byteLength(receiptEnvelopeStr) } }; var req = https.request(options, function(res) { res.setEncoding('utf8'); res.on('data', function (chunk) { console.log("body: " + chunk); cb(true, chunk); }); res.on('error', function (error) { console.log("error: " + error); cb(false, error); }); }); req.write(receiptEnvelopeStr); req.end(); }

但是，在通过lambda测试或通过我的应用程序运行此代码时，我收到一条错误消息，提示为Response body: {"errorMessage":"true"}.我注意到，如果我对代码进行调整，则会产生更多预期的错误-例如，如果我对收据数据有其他值，则会得到21002错误代码作为响应，并且如果我将"production"更改为true ，我收到21007错误.问题的部分原因是我不确切知道回调应该如何工作-https.request中的块是否与我在Swift中要执行的操作正确?我觉得收据数据格式正确，因为更改收据数据会产生不同的结果，为什么最终结果仍然是错误的?

However, when running this code, either through a lambda test or through my app, I get an error message that simply says Response body: {"errorMessage":"true"}. I've noticed that if I tweak the code I can create more expected errors- For instance, if I have some other value for the receipt-data, I get a 21002 error code in response, and if I change "production" to true, I get a 21007 error. Part of the problem is that I don't know exactly how the callback is supposed to work-- is the block inside https.request correct for what I'm trying to do in Swift? I get the impression that the receipt-data is correctly formatted since changing it yields a different result, so why is the end result still an error?

我以前没有注意到的是，当我运行Lambda函数时，出现"body:(receipt data)"行，其中(receipt data)是我发送给该函数的base 64编码数据.这使我怀疑我根本没有到达错误回调块，并且该错误与我将回调结果发送回我的应用程序的方式有关.这是什么块:

Something I previously didn't notice is that when I run the Lambda function, the line "body: (receipt data)" appears, where (receipt data) is the base 64 encoded data I sent to the function. This makes me suspect I'm not reaching the error callback block at all, and that the error has something to do with the way I send the result of the callback back to my app. What is this block:

var req = https.request(options, function(res) { res.setEncoding('utf8'); res.on('data', function (chunk) { console.log("body: " + chunk); cb(true, chunk); }); res.on('error', function (error) { console.log("error: " + error); cb(false, error); }); });

该怎么办?我是否需要启用一些权限才能接收回调?

supposed to do? Is it possible I need to enable some permission to receive the callback?

推荐答案

我最终通过遵循 示例，并使用Python代替Node.js.我之前仍然不知道我的代码到底出了什么问题，但是在Swift中使用base-64编码，然后将收据数据和密码发送给Python Lambda函数，这给了我正确的结果.

Ultimately I solved the problem by following this example and using Python instead of Node.js. I still don't know exactly what was wrong with my code before, but base-64 encoding in Swift and then sending the receipt data and password to a Python Lambda function gave me the correct result.