通过Twisted服务器验证Apple Store收据

Question

我正在尝试通过我的Twisted服务器验证来自Apple商店的应用内购买交易收据。我已经把来自我应用的(SKPaymentTransaction *)transaction.transactionReceipt发送到了我的服务器。

但是，现在我在把JSON对象发送到Apple服务器时，总是从我的Agent.request()中收到一个未处理的错误。我怀疑这是因为我没有在443端口上监听来自Apple商店的响应，但我又不想让我的应用通过443端口与我的Twisted服务器通信。以下是我的代码：

from twisted.application import internet, service
from twisted.internet import protocol, reactor
from zope.interface import implements
from twisted.web.iweb import IBodyProducer

from twisted.internet import defer
from twisted.web.client import Agent
from twisted.web.http_headers import Headers
import json
import base64

class StringProducer(object):
    implements(IBodyProducer)

    def __init__(self, body):
        self.body = body
        self.length = len(body)

    def startProducing(self, consumer):
        consumer.write(self.body)
        return succeed(None)

    def pauseProducing(self):
        pass

    def stopProducing(self):
        pass

def printResponse(response):
    print response       # just testing to see what I have

def httpRequest(url, values, headers={}, method='POST'):
    agent = Agent(reactor)
    d = agent.request(method,
                      url,
                      Headers(headers),
                      StringProducer(values)
                      )
    d.addCallback(printResponse)

class storeServer(protocol.Protocol):

    def dataReceived(self, data):
        receiptBase64 = base64.standard_b64encode(data)
        jsonReceipt = json.dumps({'receipt-data':receiptBase64})
        print jsonReceipt     # verified that my data is correct

        d = httpRequest(
            "https://buy.itunes.apple.com/verifyReceipt",
            jsonReceipt,
            {'Content-Type': ['application/x-www-form-urlencoded']}
            )

factory = protocol.Factory()
factory.protocol = storeServer
tcpServer = internet.TCPServer(30000, factory)
tcpServer.setServiceParent(application)

我该如何修复这个错误？我需要创建一个在443端口上监听的服务吗？如果是这样，我该如何让连接到我应用的服务与通过https连接的服务进行通信呢？

Answer 1

你代码里的注释写法不对。Python用#来写注释，而不是//。

修正这个问题后，我用pyflakes检查了一下代码，发现了这些错误：

program.py:1: 'service' imported but unused
program.py:6: 'defer' imported but unused
program.py:21: undefined name 'succeed'
program.py:48: local variable 'd' is assigned to but never used
program.py:57: undefined name 'application'

看起来第21行的未定义名称可能是导致你遇到的NameError错误的原因。NameError是Python用来表示这种错误的方式：

x = y

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'y' is not defined