public TunnelCreator(IProtocolClient protocolClient, string localhost, int portToBoundInLocalhost
, string foreignHost, int portInForeignHost)
{
_protocolClient = protocolClient;
_localhost = localhost;
_portToBoundInLocalhost = portToBoundInLocalhost;
_foreignHost = foreignHost;
_portInForeignHost = portInForeignHost;
}
public string Fetch(string address)
{
// TODO: ContentFetcher.Fetch()
// parse the address
// Address format:
// < type >:< server IP >:< resource >
// Where…
// < type > is one of “SD” and “FT”
// < server IP > is the IP address of the server to contact
// < resource > is the name of the resource to request from the server
if (String.IsNullOrWhiteSpace(address))
{
throw new Exception("Empty Address!");
}
string[] parts = address.Split(':');
if (parts.Length != 3)
{
throw new Exception("Invalid address format!");
}
foreach (string part in parts)
{
if (String.IsNullOrWhiteSpace(part))
{
throw new Exception("");
}
}
string protocalName = parts[0];
string serverIP = parts[1];
string resourceName = parts[2];
// retrieve the correct protocol client for the requested protocol
// watch out for invalid type
if (!protocols.ContainsKey(protocalName))
{
throw new Exception("Unrecognized protocol!");
}
IProtocolClient client = protocols[protocalName];
// get the content from the protocol client, using the given IP address and resource name
string content = client.GetDocument(serverIP, resourceName);
// return the content
return(content);
}
public void AddProtocol(string name, IProtocolClient client)
{
// save the protocol client under the given name
protocols.Add(name, client);
}
