static private void Process(object parameter)
{
object[] tmp = parameter as object[];
GXServer server = tmp[0] as GXServer;
HttpListenerContext context = tmp[1] as HttpListenerContext;
IPrincipal user = tmp[2] as IPrincipal;
try
{
ProcessRequest(server, context, user);
}
catch (HttpListenerException)
{
//Client has close connection. This is ok.
}
catch (Exception ex)
{
if (server.onError != null)
{
server.onError(server, new ErrorEventArgs(ex));
}
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
GXErrorWrapper err = new GXErrorWrapper(ex);
using (TextWriter writer = new StreamWriter(context.Response.OutputStream, Encoding.ASCII))
{
GXJsonParser parser = new GXJsonParser();
string data = parser.Serialize(err);
context.Response.ContentLength64 = data.Length;
writer.Write(data);
}
}
}
/// <summary>
/// Parse query DTO and return response DTO as string.
/// </summary>
/// <param name="method">Http method.</param>
/// <param name="path">Command to execute.</param>
/// <param name="data">Command data.</param>
/// <returns>DTO result as string.</returns>
static string GetReply(Hashtable messageMap, IPrincipal user, GXServer server, string hostAddress, string method, string path, string data)
{
InvokeHandler handler;
string command;
GXRestMethodInfo mi;
lock (messageMap)
{
mi = GXGeneral.GetTypes(messageMap, path, out command);
}
if (mi == null)
{
throw new HttpException(405, string.Format("Rest method '{0}' not implemented.", command));
}
switch (method.ToUpper())
{
case "GET":
handler = mi.Get;
break;
case "POST":
handler = mi.Post;
break;
case "PUT":
handler = mi.Put;
break;
case "DELETE":
handler = mi.Delete;
break;
default:
handler = null;
break;
}
if (handler == null)
{
throw new HttpException(405, string.Format("Method '{0}' not allowed for {1}", method, command));
}
object req = server.Parser.Deserialize("{" + data + "}", mi.RequestType);
//Get Rest class from cache.
GXRestService target = server.RestMap[mi.RestClassType] as GXRestService;
if (target == null)
{
target = GXJsonParser.CreateInstance(mi.RestClassType) as GXRestService;
server.RestMap[mi.RestClassType] = target;
}
target.Host = server.Host;
target.User = user;
target.Db = server.Connection;
target.UserHostAddress = hostAddress;
object tmp = handler(target, req);
if (tmp == null)
{
throw new HttpException(405, string.Format("Command '{0}' returned null.", command));
}
return(server.Parser.SerializeToHttp(tmp));
}
static void ProcessRequest(GXServer server, HttpListenerContext context,
IPrincipal user)
{
string path, data;
string method = context.Request.HttpMethod.ToUpper();
bool content = method == "POST" || method == "PUT";
if (content)
{
int length = (int)context.Request.ContentLength64;
MemoryStream ms = new MemoryStream(length);
Stream stream = context.Request.InputStream;
byte[] buffer = new byte[length == 0 || length > 1024 ? 1024 : length];
IAsyncResult read = stream.BeginRead(buffer, 0, buffer.Length, null, null);
while (true)
{
// wait for the read operation to complete
if (!read.AsyncWaitHandle.WaitOne())
{
break;
}
int count = stream.EndRead(read);
ms.Write(buffer, 0, count);
// If read is done.
if (ms.Position == length || count == 0)
{
break;
}
read = stream.BeginRead(buffer, 0, buffer.Length, null, null);
}
ms.Position = 0;
using (StreamReader sr = new StreamReader(ms))
{
data = sr.ReadToEnd();
}
path = context.Request.RawUrl;
}
else
{
int pos = context.Request.RawUrl.IndexOf('?');
if (pos != -1)
{
path = context.Request.RawUrl.Substring(0, pos);
data = context.Request.RawUrl.Substring(pos + 1);
data = "{\"" + data.Replace("&", "\",\"").Replace("=", "\":\"") + "\"}";
}
else
{
path = context.Request.RawUrl;
data = null;
}
}
System.Diagnostics.Debug.WriteLine("-> " + path + " : " + data);
//If proxy is used.
string add = null;
if (HttpContext.Current != null)
{
add = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
}
if (add == null)
{
add = context.Request.UserHostAddress;
}
string reply = GetReply(server.MessageMap, user, server, add, context.Request.HttpMethod, path, data);
context.Response.ContentType = "application/json";
context.Response.ContentLength64 = reply.Length;
System.Diagnostics.Debug.WriteLine("<- " + reply);
using (BufferedStream bs = new BufferedStream(context.Response.OutputStream))
{
bs.Write(ASCIIEncoding.ASCII.GetBytes(reply), 0, reply.Length);
}
}
/// <summary>
/// Show REST services.
/// </summary>
/// <param name="parameter"></param>
static private void ShowServices(object parameter)
{
object[] tmp = parameter as object[];
GXServer server = tmp[0] as GXServer;
HttpListenerContext context = tmp[1] as HttpListenerContext;
StringBuilder writer = new StringBuilder();
writer.AppendLine("<!DOCTYPE html >");
writer.AppendLine("<html>");
writer.AppendLine("<style>");
writer.AppendLine(".tooltip {");
writer.AppendLine("position: relative;");
writer.AppendLine("display: inline-block;");
writer.AppendLine("border-bottom: 1px dotted black;");
writer.AppendLine("}");
writer.AppendLine(".tooltip .tooltiptext {");
writer.AppendLine("visibility: hidden;");
writer.AppendLine("width: 600px;");
writer.AppendLine("background-color: Gray;");
writer.AppendLine("color: #fff;");
writer.AppendLine("text-align: left;");
writer.AppendLine("border-radius: 6px;");
writer.AppendLine("padding: 5px 0;");
/* Position the tooltip */
writer.AppendLine("position: absolute;");
writer.AppendLine("z-index: 1;");
writer.AppendLine("}");
writer.AppendLine(".tooltip:hover .tooltiptext {");
writer.AppendLine("visibility: visible;");
writer.AppendLine("}");
writer.AppendLine("</style>");
writer.AppendLine("<body>");
string info = Convert.ToString(server.Host);
if (info != "")
{
writer.AppendLine("<h1>Server information:</h1>");
writer.AppendLine(info.Replace("\r\n", "<br/>"));
writer.AppendLine("<hr>");
}
writer.Append("<h1>Available REST operations:");
writer.AppendLine("</h1>");
if (server.MessageMap.Count == 0)
{
GXGeneral.UpdateRestMessageTypes(server.MessageMap);
if (server.MessageMap.Count == 0)
{
writer.AppendLine("No REST operations available.");
}
}
DescriptionAttribute[] att;
foreach (GXRestMethodInfo it in server.MessageMap.Values)
{
writer.Append("<div class=\"tooltip\">" + it.RequestType.Name);
writer.Append("<span class=\"tooltiptext\">");
writer.Append("Method: ");
if (it.Get != null)
{
writer.Append("Get");
}
else if (it.Post != null)
{
writer.Append("Post");
}
else if (it.Put != null)
{
writer.Append("Put");
}
else if (it.Delete != null)
{
writer.Append("Delete");
}
writer.Append("<p></p>");
att = (DescriptionAttribute[])it.RequestType.GetCustomAttributes(typeof(DescriptionAttribute), true);
if (att.Length != 0)
{
writer.AppendLine(att[0].Description);
writer.AppendLine("<br/>");
}
writer.AppendLine("<b>Request:</b><br/>{<br/>");
foreach (PropertyInfo p in it.RequestType.GetProperties())
{
ShowProperties(p, writer);
}
writer.Append("}<p></p>");
att = (DescriptionAttribute[])it.ResponseType.GetCustomAttributes(typeof(DescriptionAttribute), true);
if (att.Length != 0)
{
writer.AppendLine(att[0].Description);
writer.AppendLine("<br/>");
}
writer.AppendLine("<b>Response:</b><br/>{<br/>");
foreach (PropertyInfo p in it.ResponseType.GetProperties())
{
ShowProperties(p, writer);
}
writer.Append("}<br/>");
writer.Append("</span></div><br/>");
att = (DescriptionAttribute[])it.RequestType.GetCustomAttributes(typeof(DescriptionAttribute), true);
if (att.Length != 0)
{
writer.AppendLine(att[0].Description);
}
writer.AppendLine("<p></p>");
}
writer.AppendLine("</body>");
writer.AppendLine("</html>");
using (BufferedStream bs = new BufferedStream(context.Response.OutputStream))
{
StreamWriter sw = new StreamWriter(bs);
sw.Write(writer.ToString());
sw.Flush();
}
}
/// <summary>
/// Listen clients as long as server is up and running.
/// </summary>
/// <param name="parameter"></param>
void ListenThread(object parameter)
{
IPrincipal user;
HttpListenerContext c = null;
GXServer tmp = parameter as GXServer;
HttpListener Listener = tmp.Listener;
while (Listener.IsListening)
{
bool accept = false;
string username, password;
AutoResetEvent h = new AutoResetEvent(false);
IAsyncResult result = Listener.BeginGetContext(delegate(IAsyncResult ListenerCallback)
{
HttpListener listener = (HttpListener)ListenerCallback.AsyncState;
//If server is not closed.
if (listener.IsListening)
{
bool html = false;
try
{
c = listener.EndGetContext(ListenerCallback);
}
catch (Exception ex)
{
if (onError != null)
{
onError(this, new ErrorEventArgs(ex));
}
h.Set();
return;
}
if (c.Request.HttpMethod == "GET" && c.Request.AcceptTypes != null)
{
foreach (var it in c.Request.AcceptTypes)
{
if (it == "text/html")
{
Thread thread = new Thread(new ParameterizedThreadStart(ShowServices));
thread.Start(new object[] { tmp, c });
html = true;
accept = true;
break;
}
if (it.Contains("image"))
{
html = true;
accept = true;
break;
}
}
}
if (!html)
{
GXWebServiceModule.TryAuthenticate(tmp.MessageMap, c.Request, out username, out password);
//Anonymous access is allowed.
if (username == null && password == null)
{
accept = true;
user = null;
}
else
{
user = TryAuthenticate(username, password);
accept = user != null;
}
if (accept)
{
Thread thread = new Thread(new ParameterizedThreadStart(Process));
thread.Start(new object[] { tmp, c, user });
}
else
{
c.Response.StatusCode = 401;
c.Response.StatusDescription = "Access Denied";
c.Response.AddHeader("WWW-Authenticate", "Basic Realm");
GXErrorWrapper err = new GXErrorWrapper(new HttpException(401, "Access Denied"));
using (TextWriter writer = new StreamWriter(c.Response.OutputStream, Encoding.ASCII))
{
GXJsonParser parser = new GXJsonParser();
string data = parser.Serialize(err);
c.Response.ContentLength64 = data.Length;
writer.Write(data);
}
c.Response.Close();
}
}
h.Set();
}
}, Listener);
EventWaitHandle.WaitAny(new EventWaitHandle[] { h, Closing });
if (!accept || !Listener.IsListening)
{
result.AsyncWaitHandle.WaitOne(1000);
Closed.Set();
break;
}
}
}
