private Uri CreateRemoteUri(MappingElement mapping, IDictionary <string, string> tokens)
{
Uri remoteUri;
string uri = ReplaceTokens(mapping.TargetURI, tokens);
remoteUri = new Uri(uri);
return(remoteUri);
}
void IHttpHandler.ProcessRequest(HttpContext context)
{
MappingElement mapping = null;
Uri outgoingUri;
HttpWebResponse response;
//Check Configuration
if (Configuration == null)
{
throw new Exception("Unable to load Configuration");
}
// Search for a matching mapping
foreach (MappingElement map in Configuration.Mappings)
{
if (MatchUri(context.Request.Url, map.SourceURI, map.SourceRegexMatching))
{
mapping = map;
break;
}
}
// Return 404 if can't find mapping
if (mapping == null)
{
Utility.Return404(context);
return;
}
// Create destination mapping, this includes GET query as well
outgoingUri = CreateRemoteUri(mapping, GenerateTokensFromRequest(context.Request));
HttpWebRequest outgoing = (HttpWebRequest)WebRequest.Create(outgoingUri);
// Credentials
// TODO: Impliment Credential pass-through
//request.Credentials = CredentialCache.DefaultCredentials;
// Headers
Utility.CopyHeaders(context.Request, outgoing);
// Copy POST Data
if (mapping.SourceIncludePost && (context.Request.RequestType == "POST"))
{
outgoing.ContentLength = context.Request.ContentLength;
Utility.CopyStream(context.Request.InputStream, outgoing.GetRequestStream());
}
try
{
response = (HttpWebResponse)outgoing.GetResponse();
}
catch (WebException ex)
{
Utility.Return500(context, ex);
return;
}
Stream receiveStream = response.GetResponseStream();
//Copy some headers, not too many since I'm not against hiding internal details ;)
//TODO: copy cookies?
context.Response.ContentType = response.ContentType;
// Copy Content Encoding
//context.Response.ContentEncoding = Encoding.
//context.Response.
// Do any parsing of HTML (or anything with URLs) here
if (!string.IsNullOrEmpty(mapping.RewriteContent) &&
((response.ContentType.ToLower().IndexOf("html") >= 0) || (response.ContentType.ToLower().IndexOf("javascript") >= 0))
)
{
string sResp = Utility.ConvertStream(receiveStream);
sResp = RewriteContent(sResp, mapping.RewriteContent);
context.Response.Write(sResp);
}
else
{
// Output without rewriting, this will offer the best performance and lowest memory useage.
Utility.CopyStream(receiveStream, context.Response.OutputStream);
}
response.Close();
context.Response.End();
}