public async Task Invoke(HttpContext context)
{
ProtocolId protocolId = ProtocolId.None;
try
{
var httpRequest = context.Request;
var httpResponse = context.Response;
XXTea xxtea = null;
ProtocolReq req = null;
byte encrypted;
uint hash;
int length = (int)httpRequest.ContentLength;
byte[] inBuffer = new byte[length];
using (var inStream = httpRequest.Body)
using (var stream = new MemoryStream(inBuffer))
using (var reader = new BinaryReader(stream))
{
await inStream.CopyToAsync(stream);
stream.Position = 0;
encrypted = reader.ReadByte();
hash = reader.ReadUInt32();
if (encrypted == 2)
{
xxtea = new XXTea(new uint[] { hash ^ ServerConfig.Key1, hash ^ ServerConfig.Key2, hash ^ ServerConfig.Key3, hash ^ ServerConfig.Key4 });
}
else if (encrypted == 1)
{
xxtea = new XXTea(new uint[] { ServerConfig.Key1, ServerConfig.Key2, ServerConfig.Key3, ServerConfig.Key4 });
req = DecryptAndDeserialize(xxtea, inBuffer, 5, length - 5);
protocolId = req.Protocol.ProtocolId;
if (protocolId == ProtocolId.Auth)
{
}
else
{
throw new Exception("encrypted == 1 is allowed to only Protocol Auth");
}
}
else if (encrypted == 0)
{
req = Serializer.Deserialize <ProtocolReq>(stream);
protocolId = req.Protocol.ProtocolId;
if (protocolId == ProtocolId.HandShake)
{
}
else
{
throw new Exception("encrypted == 0 is allowed to Protocol HandShake");
}
}
else
{
throw new Exception("Encrypted : Unavaiable Value");
}
}
byte[] data = null;
ProtocolRes response = await Service.ProcessAsync(context, req.Suid, hash, req.Protocol);
if (response.ProtocolId == ProtocolId.Error)
{
encrypted = 0;
xxtea = null;
}
using (var stream = new MemoryStream())
using (var writer = new BinaryWriter(stream))
{
writer.Write(encrypted);
if (xxtea != null)
{
writer.Write(SerializeAndEncrypt(xxtea, response));
}
else
{
Serializer.Serialize(stream, response);
}
data = stream.ToArray();
httpResponse.ContentLength = data.Length;
using (Stream outStream = httpResponse.Body)
{
await outStream.WriteAsync(data, 0, data.Length);
}
}
}
catch (Exception ex)
{
}
}
/// <summary>
/// Checks all <c>Protocol</c>s are unique and that
/// each required up/down service is provided
/// </summary>
/// <param name="protocols">Protocols that will be used for the stack</param>
private void sanityCheck(Protocol[] protocols)
{
Protocol prot;
String name;
ProtocolReq req;
ArrayList req_list = new ArrayList();
int evt_type;
// Checks for unique names
for (int i = 0; i < protocols.Length; i++)
{
prot = (Protocol)protocols[i];
name = prot.Name;
for (int j = 0; j < protocols.Length; j++)
{
if (i == j)
{
continue;
}
if (String.Compare(name, protocols[j].Name) == 0)
{
throw new Exception("Configurator.sanityCheck(): protocol name " + name +
" has been used more than once; protocol names have to be unique !");
}
}
}
// Checks whether all requirements of all layers are met
for (int i = 0; i < protocols.Length; i++)
{
prot = (Protocol)protocols[i];
req = new ProtocolReq(prot.Name);
req.up_reqs = prot.requiredUpServices();
req.down_reqs = prot.requiredDownServices();
req.up_provides = prot.providedUpServices();
req.down_provides = prot.providedDownServices();
req_list.Add(req);
}
for (int i = 0; i < req_list.Count; i++)
{
req = (ProtocolReq)req_list[i];
// check whether layers above this one provide corresponding down services
if (req.up_reqs != null)
{
for (int j = 0; j < req.up_reqs.Count; j++)
{
evt_type = ((int)req.up_reqs[j]);
if (!providesDownServices(i, req_list, evt_type))
{
throw new Exception("Configurator.sanityCheck(): event " +
Event.type2String(evt_type) + " is required by " +
req.name + ", but not provided by any of the layers above");
}
}
}
// check whether layers below this one provide corresponding up services
if (req.down_reqs != null)
{ // check whether layers above this one provide up_reqs
for (int j = 0; j < req.down_reqs.Count; j++)
{
evt_type = ((int)req.down_reqs[j]);
if (!providesUpServices(i, req_list, evt_type))
{
throw new Exception("Configurator.sanityCheck(): event " +
Event.type2String(evt_type) + " is required by " +
req.name + ", but not provided by any of the layers below");
}
}
}
}
}
/// <summary>
/// Checks all <c>Protocol</c>s are unique and that
/// each required up/down service is provided
/// </summary>
/// <param name="protocols">Protocols that will be used for the stack</param>
private void sanityCheck(Protocol[] protocols)
{
Protocol prot;
String name;
ProtocolReq req;
ArrayList req_list=new ArrayList();
int evt_type;
// Checks for unique names
for(int i=0; i < protocols.Length; i++)
{
prot = (Protocol)protocols[i];
name = prot.Name;
for(int j=0; j < protocols.Length; j++)
{
if(i==j)
continue;
if(String.Compare(name,protocols[j].Name)==0)
{
throw new Exception("Configurator.sanityCheck(): protocol name " + name +
" has been used more than once; protocol names have to be unique !");
}
}
}
// Checks whether all requirements of all layers are met
for(int i=0; i < protocols.Length; i++)
{
prot=(Protocol)protocols[i];
req=new ProtocolReq(prot.Name);
req.up_reqs=prot.requiredUpServices();
req.down_reqs=prot.requiredDownServices();
req.up_provides=prot.providedUpServices();
req.down_provides=prot.providedDownServices();
req_list.Add(req);
}
for(int i=0; i < req_list.Count; i++)
{
req=(ProtocolReq)req_list[i];
// check whether layers above this one provide corresponding down services
if(req.up_reqs != null)
{
for(int j=0; j < req.up_reqs.Count; j++)
{
evt_type=((int)req.up_reqs[j]);
if(!providesDownServices(i, req_list, evt_type))
{
throw new Exception("Configurator.sanityCheck(): event " +
Event.type2String(evt_type) + " is required by " +
req.name + ", but not provided by any of the layers above");
}
}
}
// check whether layers below this one provide corresponding up services
if(req.down_reqs != null)
{ // check whether layers above this one provide up_reqs
for(int j=0; j < req.down_reqs.Count; j++)
{
evt_type=((int)req.down_reqs[j]);
if(!providesUpServices(i, req_list, evt_type))
{
throw new Exception("Configurator.sanityCheck(): event " +
Event.type2String(evt_type) + " is required by " +
req.name + ", but not provided by any of the layers below");
}
}
}
}
}
/// <summary>Throws an exception if sanity check fails. Possible sanity check is uniqueness of all protocol
/// names.
/// </summary>
public virtual void sanityCheck(System.Collections.ArrayList protocols)
{
System.Collections.ArrayList names = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
Protocol prot;
string name;
ProtocolReq req;
System.Collections.ArrayList req_list = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
int evt_type;
// Checks for unique names
for (int i = 0; i < protocols.Count; i++)
{
prot = (Protocol) protocols[i];
name = prot.Name;
for (int j = 0; j < names.Count; j++)
{
if (name.Equals(names[j]))
{
throw new System.Exception("Configurator.sanityCheck(): protocol name " + name + " has been used more than once; protocol names have to be unique !");
}
}
names.Add(name);
}
// Checks whether all requirements of all layers are met
for (int i = 0; i < protocols.Count; i++)
{
prot = (Protocol) protocols[i];
req = new ProtocolReq(prot.Name);
req.up_reqs = prot.requiredUpServices();
req.down_reqs = prot.requiredDownServices();
req.up_provides = prot.providedUpServices();
req.down_provides = prot.providedDownServices();
req_list.Add(req);
}
for (int i = 0; i < req_list.Count; i++)
{
req = (ProtocolReq) req_list[i];
// check whether layers above this one provide corresponding down services
if (req.up_reqs != null)
{
for (int j = 0; j < req.up_reqs.Count; j++)
{
evt_type = ((System.Int32) req.up_reqs[j]);
if (!providesDownServices(i, req_list, evt_type))
{
throw new System.Exception("Configurator.sanityCheck(): event " + Event.type2String(evt_type) + " is required by " + req.name + ", but not provided by any of the layers above");
}
}
}
// check whether layers below this one provide corresponding up services
if (req.down_reqs != null)
{
// check whether layers above this one provide up_reqs
for (int j = 0; j < req.down_reqs.Count; j++)
{
evt_type = ((System.Int32) req.down_reqs[j]);
if (!providesUpServices(i, req_list, evt_type))
{
throw new System.Exception("Configurator.sanityCheck(): event " + Event.type2String(evt_type) + " is required by " + req.name + ", but not provided by any of the layers below");
}
}
}
}
}
