public Method FindMethodByName(string name)
{
//
// First make a quick, case-sensitive look-up.
//
int i = InvariantStringArray.BinarySearch(_methodNames, name);
if (i >= 0)
{
return(_sortedMethods[i]);
}
//
// Failing, use a slower case-insensitive look-up.
// TODO: Consider speeding up FindMethodByName for case-insensitive look-ups.
//
foreach (Method method in _methods)
{
if (CaselessString.Equals(method.Name, name))
{
return(method);
}
}
return(null);
}
protected virtual object InferFeature()
{
HttpRequest request = Context.Request;
string verb = request.RequestType;
if (CaselessString.Equals(verb, "GET") ||
CaselessString.Equals(verb, "HEAD"))
{
//
// If there is path tail then it indicates a GET-safe RPC.
//
if (request.PathInfo.Length > 1)
{
return(GetFeatureByName("getrpc"));
}
//
// Otherwise, get the feature name from anonymous query
// string parameter.
//
return(GetFeatureByName(Mask.EmptyString(request.QueryString[null], "help")));
}
else if (CaselessString.Equals(verb, "POST"))
{
//
// POST means RPC.
//
return(GetFeatureByName("rpc"));
}
return(null);
}
protected override void ProcessRequest()
{
if (!CaselessString.Equals(Request.RequestType, "POST"))
{
throw new JsonRpcException(string.Format("HTTP {0} is not supported for RPC execution. Use HTTP POST only.", Request.RequestType));
}
//
// Sets the "Cache-Control" header value to "no-cache".
// NOTE: It does not send the common HTTP 1.0 request directive
// "Pragma" with the value "no-cache".
//
Response.Cache.SetCacheability(HttpCacheability.NoCache);
//
// Response will be plain text, though it would have been nice to
// be more specific, like text/json.
//
Response.ContentType = "application/json";
//
// Delegate rest of the work to JsonRpcServer.
//
JsonRpcDispatcher dispatcher = JsonRpcDispatcherFactory.CreateDispatcher(Service);
using (new JsonRpcDispatchScope(dispatcher, Context))
using (TextReader reader = GetRequestReader())
dispatcher.Process(reader, Response.Output);
}
private static object ReadParameters(Method method, JsonReader reader, JsonImportHandler importer)
{
Debug.Assert(method != null);
Debug.Assert(reader != null);
Debug.Assert(importer != null);
reader.MoveToContent();
Parameter[] parameters = method.GetParameters();
if (reader.TokenClass == JsonTokenClass.Array)
{
reader.Read();
ArrayList argList = new ArrayList(parameters.Length);
for (int i = 0; i < parameters.Length && reader.TokenClass != JsonTokenClass.EndArray; i++)
{
argList.Add(importer(parameters[i].ParameterType, reader));
}
reader.StepOut();
return(argList.ToArray());
}
else if (reader.TokenClass == JsonTokenClass.Object)
{
reader.Read();
JsonObject argByName = new JsonObject();
while (reader.TokenClass != JsonTokenClass.EndObject)
{
// TODO: Imporve this lookup.
// FIXME: Does not work when argument is positional.
Type parameterType = AnyType.Value;
string name = reader.ReadMember();
foreach (Parameter parameter in parameters)
{
if (CaselessString.Equals(parameter.Name, name))
{
parameterType = parameter.ParameterType;
break;
}
}
argByName.Put(name, importer(parameterType, reader));
}
reader.Read();
return(argByName);
}
else
{
return(importer(AnyType.Value, reader));
}
}
private TextReader GetRequestReader()
{
string contentType = Request.ContentType.Split(';')[0];
if (CaselessString.Equals(contentType, "application/x-www-form-urlencoded"))
{
string request = Request.Form.Count == 1 ? Request.Form[0] : Request.Form["JSON-RPC"];
return(new StringReader(request));
}
else
{
return(new StreamReader(Request.InputStream, Request.ContentEncoding));
}
}
protected override void ProcessRequest()
{
string httpMethod = Request.RequestType;
if (!CaselessString.Equals(httpMethod, "GET") &&
!CaselessString.Equals(httpMethod, "HEAD"))
{
throw new JsonRpcException(string.Format("HTTP {0} is not supported for RPC execution. Use HTTP GET or HEAD only.", httpMethod));
}
string callback = Mask.NullString(Request.QueryString["jsonp"]);
bool padded = callback.Length > 0;
//
// The response type depends on whether JSONP (JSON with
// Padding) is in effect or not.
//
Response.ContentType = padded ? "text/javascript" : "application/json";
//
// Validate that the JSONP callback method conforms to the
// allowed syntax. If not, issue a client-side exception
// that will certainly help to bring problem to light, even if
// a little too aggressively.
//
if (padded)
{
if (!_jsonpex.IsMatch(callback))
{
Response.Write("throw new Error('Invalid JSONP callback parameter value.');");
Response.End();
}
}
//
// Convert the query string into a call object.
//
StringWriter sw = new StringWriter();
JsonWriter writer = JsonText.CreateWriter(sw);
writer.WriteStartObject();
writer.WriteMember("id");
writer.WriteNumber(-1);
writer.WriteMember("method");
string methodName = Mask.NullString(Request.PathInfo);
if (methodName.Length == 0)
{
writer.WriteNull();
}
else
{
//
// If the method name contains periods then we replace it
// with dashes to mean the one and same thing. This is
// done to provide dashes as an alternative to some periods
// since some web servers may block requests (for security
// reasons) if a path component of the URL contains more
// than one period.
//
writer.WriteString(methodName.Substring(1).Replace('-', '.'));
}
writer.WriteMember("params");
NameValueCollection query = new NameValueCollection(Request.QueryString);
query.Remove(string.Empty);
JsonConvert.Export(Request.QueryString, writer);
writer.WriteEndObject();
//
// Delegate rest of the work to JsonRpcDispatcher.
//
JsonRpcDispatcher dispatcher = JsonRpcDispatcherFactory.CreateDispatcher(Service);
using (new JsonRpcDispatchScope(dispatcher, Context))
{
dispatcher.RequireIdempotency = true;
if (padded)
{
//
// For JSONP, see details here:
// http://bob.pythonmac.org/archives/2005/12/05/remote-json-jsonp/
//
Response.Write(callback);
Response.Write('(');
}
dispatcher.Process(new StringReader(sw.ToString()), Response.Output, true);
if (padded)
{
Response.Write(')');
}
}
}
