APNS IOS 消息推送处理失效的Token

在开发苹果推送服务时候，要合理的控制ios设备的Token,而这个Token是由苹果服务器Apns产生的，就是每次app问Apns要Token，由苹果服务器产生的Token会记录到Apns里面，我们需要根据该Token进行制定设备的消息推送，所有Token需要我们自己去记录和管理，每个设备对应唯一的Token,而app的用户登录会有自己约束的别名，与该tokne进行关系绑定，这样按该别名进行推送，就可以找到对应的Token，进而推送到该iso设备上，对应失效的Token我们需要访问苹果的feedbackServer,拿取失效的Token，然后把本地记录的失效token进行移除。

注意事项：
1.建议和feedback服务器建立长连接，连接过于频繁有可能被当做攻击(简简单单的做一些测试时没有关系的);所有在实际开发完成后，我们基本上可以半天与feedback服务器建立一次socket连接，拿取失效的token,
2.获取的token是在上次你给你的应用发推送失败时加feedback服务的，里面会返回失败的具体时间.
3.返回的数据由三部分组成，请看下面的图：

构中包含三个部分，第一部分是一个上次发推送失败的时间戳，第二个部分是device_token的长度，第三部分就是失效的device_token

/// <summary>
/// FeedbackService
/// </summary>
public class FeedbackService
{
public FeedbackService(ApnsConfiguration configuration)
{
Configuration = configuration;
}
public ApnsConfiguration Configuration { get; private set; }
public delegate void FeedbackReceivedDelegate(string deviceToken, DateTime timestamp);
public event FeedbackReceivedDelegate FeedbackReceived;
public void Check()
{
var encoding = Encoding.ASCII;
var certificate = Configuration.Certificate;
var certificates = new X509CertificateCollection();
certificates.Add(certificate);
var client = new TcpClient(Configuration.FeedbackHost, Configuration.FeedbackPort);
var stream = new SslStream(client.GetStream(), true,
(sender, cert, chain, sslErrs) => { return true; },
(sender, targetHost, localCerts, remoteCert, acceptableIssuers) => { return certificate; });
stream.AuthenticateAsClient(Configuration.FeedbackHost, certificates, System.Security.Authentication.SslProtocols.Tls, false);
//Set up
byte[] buffer = new byte[4096];
int recd = 0;
var data = new List<byte>();
//Get the first feedback
recd = stream.Read(buffer, 0, buffer.Length);
//Continue while we have results and are not disposing
while (recd > 0)
{
// Add the received data to a list buffer to work with (easier to manipulate)
for (int i = 0; i < recd; i++)
data.Add(buffer[i]);
//Process each complete notification "packet" available in the buffer
while (data.Count >= (4 + 2 + 32)) // Minimum size for a valid packet

{
var secondsBuffer = data.GetRange(0, 4).ToArray();
var tokenLengthBuffer = data.GetRange(4, 2).ToArray();
// Get our seconds since epoch
// Check endianness and reverse if needed
if (BitConverter.IsLittleEndian)
Array.Reverse(secondsBuffer);
var seconds = BitConverter.ToInt32(secondsBuffer, 0);
//Add seconds since 1970 to that date, in UTC
var timestamp = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddSeconds(seconds);
//flag to allow feedback times in UTC or local, but default is local
if (!Configuration.FeedbackTimeIsUTC)
timestamp = timestamp.ToLocalTime();
if (BitConverter.IsLittleEndian)
Array.Reverse(tokenLengthBuffer);
var tokenLength = BitConverter.ToInt16(tokenLengthBuffer, 0);
if (data.Count >= 4 + 2 + tokenLength)
{
var tokenBuffer = data.GetRange(6, tokenLength).ToArray();
// Strings shouldn't care about endian-ness... this shouldn't be reversed
//if (BitConverter.IsLittleEndian)
//
Array.Reverse (tokenBuffer);
var token = BitConverter.ToString(tokenBuffer).Replace("-", "").ToLower().Trim();
// Remove what we parsed from the buffer
data.RemoveRange(0, 4 + 2 + tokenLength);
// Raise the event to the consumer
var evt = FeedbackReceived;
if (evt != null)
evt(token, timestamp);
}
else
{
continue;
}
}
//Read the next feedback
recd = stream.Read(buffer, 0, buffer.Length);
}
try
{
stream.Close();
stream.Dispose();
}
catch { }
try
{
client.Client.Shutdown(SocketShutdown.Both);
client.Client.Dispose();
}
catch { }
try { client.Close(); }
catch { }
}
}

下面是处理逻辑：

/// <summary>
/// 处理失效的Token逻辑信息
/// </summary>
public class TokenProvider
{
private FeedbackService fs = null;
private int hour = 12;
private string CID;
public TokenProvider(ApnsConfiguration cf, string CID)
{
this.fs = fs = new FeedbackService(cf);
this.CID = CID;
try
{
int hour = int.Parse(ConfigurationManager.AppSettings["ManagerTokenHour"]);//Token的控制时间

}
catch { hour = 12; }
}
/// <summary>
/// 开启处理失效的Token逻辑信息
/// </summary>
/// <param name="cf"></param>
public void Init()
{
try
{
Thread thsub = new Thread(new ThreadStart(() =>
{
while (true)
{
try
{
fs.Check();
}
catch (Exception ex)
{
LogInfoProvider.config.Logs.Add(new LogClass() { LogStr = " fs.Check() Error! CID=" + CID, ExInfo = ex });
}
Thread.Sleep(hour * 60 * 60 * 1000);
}
}));
fs.FeedbackReceived += fs_FeedbackReceived;
thsub.Start();
LogInfoProvider.config.Logs.Add(new LogClass() { LogStr = "Open TokenProvider! CID=" + CID });
}
catch (Exception ex)
{ LogInfoProvider.config.Logs.Add(new LogClass() { LogStr = " Open TokenProvider Error! CID=" + CID, ExInfo = ex }); }
}
/// <summary>
/// 处理失效的Token信息
/// </summary>
/// <param name="deviceToken"></param>
/// <param name="timestamp"></param>
private void fs_FeedbackReceived(string deviceToken, DateTime timestamp)
{
try
{
p_DeleteToken p = new p_DeleteToken(deviceToken);
if (p.ExecutionDelete()) {
LogInfoProvider.config.Logs.Add(new LogClass() { LogStr = "Delete lose token success >> " + deviceToken });
} else {
LogInfoProvider.config.Logs.Add(new LogClass() { LogStr = "Delete lose token error >> " + deviceToken, ExInfo = null });
};
}
catch (Exception ex)
{
LogInfoProvider.config.Logs.Add(new LogClass() { LogStr = "fs_FeedbackReceived Error! CID=" + CID, ExInfo = ex });
}
}
}