/// <summary>
/// Utility function to wrap the error message into a JSON message.
/// </summary>
/// <param name="err"></param>
/// <returns></returns>
private String JSONError(String err)
{
JSONstatus status = new JSONstatus();
status.result = err;
return(this.serializer.Serialize(status));
}
/// <summary>
/// Process the current HTTP/REST request
/// </summary>
/// <param name="Context">returned from the asynchronous httplistener</param>
protected virtual void ProcessRequest(HttpListenerContext Context)
{
HttpListenerRequest request = Context.Request;
HttpListenerResponse response = Context.Response;
String cmd = request.Url.LocalPath.Substring(1).ToUpper();
String responseString = null;
response.StatusCode = (int)HttpStatusCode.OK;
// Giant command processing switch
switch (cmd) {
case "WHOAMI":
IPAddress who = request.RemoteEndPoint.Address;
JSONwhoami ami = new JSONwhoami();
Trace.WriteLine("DEBUG: I am " + who.ToString() + " " + request.Headers);
foreach (NetService service in sinkServices) {
IList addresses = service.Addresses;
foreach (IPEndPoint addr in addresses) {
Trace.WriteLine("DEBUG: am I sink " + addr.Address.ToString());
if (who.Equals(addr.Address)) {
if (service.Type.StartsWith(Shared.DisplayCastGlobals.PLAYER))
ami.player = service.Name;
if (service.Type.StartsWith(Shared.DisplayCastGlobals.ARCHIVER))
ami.archiver = service.Name;
}
}
}
foreach (NetService service in sourceServices) {
IList addresses = service.Addresses;
foreach (IPEndPoint addr in addresses) {
Trace.WriteLine("DEBUG: am I source " + addr.Address.ToString());
if (who.Equals(addr.Address)) {
if (service.Type.StartsWith(Shared.DisplayCastGlobals.STREAMER))
ami.streamer = service.Name;
}
}
}
responseString = serializer.Serialize(ami);
break;
case "LISTPLAYERS":
responseString = serializer.Serialize(players);
break;
case "LISTARCHIVERS":
responseString = serializer.Serialize(archivers);
break;
case "LISTSTREAMERS":
responseString = serializer.Serialize(streamers);
break;
case "LISTSESSIONS":
responseString = serializer.Serialize(sessions);
break;
case "STATUS":
if ((request.Url.Query == null) || (request.Url.Query.Length < 2)) {
response.StatusCode = (int)HttpStatusCode.BadRequest;
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_STATUS;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
} else {
String id = request.Url.Query.Substring(1);
JSONSrcSink res = null;
// Could be status of players/archivers/streamers
foreach (JSONSrcSink clnt in players)
if (clnt.id.Equals(id)) {
res = clnt;
break;
}
if (res == null)
foreach (JSONSrcSink clnt in archivers)
if (clnt.id.Equals(id)) {
res = clnt;
break;
}
if (res == null)
foreach (JSONSrcSink clnt in streamers)
if (clnt.id.Equals(id)) {
res = clnt;
break;
}
if (res == null) {
response.StatusCode = (int)HttpStatusCode.NotFound;
response.StatusDescription = "ID: " + id + " unknown";
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR);
} else
responseString = serializer.Serialize(res);
}
break;
case "SESSIONSTATUS":
if ((request.Url.Query == null) || (request.Url.Query.Length < 2)) {
response.StatusCode = (int)HttpStatusCode.BadRequest;
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_SESSIONSTATUS;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
} else {
String id = request.Url.Query.Substring(1);
JSONSession res = null;
foreach (JSONSession sess in sessions)
if (sess.id.Equals(id)) {
res = sess;
break;
}
if (res == null) {
response.StatusCode = (int)HttpStatusCode.NotFound;
response.StatusDescription = "ID: " + id + " unknown";
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR);
} else
responseString = serializer.Serialize(res);
}
break;
case "SNAPSHOT":
if ((request.Url.Query == null) || (request.Url.Query.Length < 2)) {
response.StatusCode = (int)HttpStatusCode.BadRequest;
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_SNAPSHOT;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
} else {
String id = request.Url.Query.Substring(1);
char[] delimiters = { '=', '&' };
String[] words = id.Split(delimiters);
if ((words.Length < 2) || (!words[0].ToUpper().Equals("ID"))) {
response.StatusCode = (int)HttpStatusCode.BadRequest;
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_SNAPSHOT;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
} else {
NetService service = null;
foreach (NetService s in sourceServices)
if (s.Name.Equals(words[1])) {
service = s;
break;
}
#if DEBUG
else
responseString = responseString + "Are we: " + s.Name + "\n";
#endif
if (service == null) {
response.StatusCode = (int)HttpStatusCode.NotFound;
response.StatusDescription = "ID: " + words[1] + " unknown";
responseString = JSONError(
#if DEBUG
responseString +
#endif
DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR + words[1]);
} else {
String port = null;
if (service.TXTRecordData != null) {
byte[] txt = service.TXTRecordData;
IDictionary dict = NetService.DictionaryFromTXTRecordData(txt);
if (dict != null) {
foreach (DictionaryEntry kvp in dict) {
String key = (String)kvp.Key;
key = key.ToUpper();
if (key.Equals("IMAGEPORT")) {
byte[] value = (byte[])kvp.Value;
try {
port = Encoding.UTF8.GetString(value);
} catch {
}
break;
}
}
}
}
if (port == null) {
response.ContentType = "image/png";
Int32 reqWidth = 800, reqHeight = 600;
if ((words.Length >= 4) && (words[3].ToUpper().Equals("WIDTH"))) {
reqWidth = Convert.ToInt32(words[4]);
reqHeight = reqWidth * reqHeight / 800;
}
Bitmap bmp = new Bitmap(reqWidth, reqHeight, PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(bmp);
Font rectangleFont = new Font("Arial", 10, FontStyle.Bold);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.Clear(Color.LightGray);
g.DrawString("Desktop snapshot from " + service.Name + " should go here", rectangleFont, SystemBrushes.WindowText, new PointF(10, 40));
bmp.Save(response.OutputStream, ImageFormat.Png);
g.Dispose();
bmp.Dispose();
} else {
IList addresses = service.Addresses;
int portNum = Convert.ToInt32(port);
foreach (System.Net.IPEndPoint addr in addresses) {
System.Net.Sockets.TcpClient clntSocket = new System.Net.Sockets.TcpClient();
try {
clntSocket.Connect(addr.Address, portNum);
if (clntSocket.Connected) {
clntSocket.Close();
response.Redirect("http://" + addr.Address.ToString() + ":" + port + request.Url.Query);
break;
}
} catch (SocketException) {
//Ignore and try the next address
}
}
if (response.StatusCode != (int)HttpStatusCode.Redirect) {
response.ContentType = "image/png";
Int32 reqWidth = 800, reqHeight = 600;
if ((words.Length >= 4) && (words[2].ToUpper().Equals("WIDTH"))) {
reqWidth = Convert.ToInt32(words[3]);
reqHeight = reqWidth * reqHeight / 800;
Trace.WriteLine("DEBUG: Changed image dimensions to: " + reqWidth + "x" + reqHeight);
}
Bitmap bmp = new Bitmap(reqWidth, reqHeight, PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(bmp);
Font rectangleFont = new Font("Arial", 10, FontStyle.Bold);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.Clear(Color.LightGray);
g.DrawString("Desktop " + service.Name + "at " + port + " not responding", rectangleFont, SystemBrushes.WindowText, new PointF(10, 40));
bmp.Save(response.OutputStream, ImageFormat.Png);
g.Dispose();
bmp.Dispose();
}
}
response.Close();
return;
}
}
}
break;
case "CONNECT":
if ((request.Url.Query == null) || (request.Url.Query.Length < 2)) {
response.StatusCode = (int)HttpStatusCode.BadRequest;
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_CONNECT;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
} else {
String q = request.Url.Query.Substring(1);
char[] delimiters = { '=', '&' };
String[] words = q.Split(delimiters);
if (((words.Length == 4) || (words.Length == 6)) && words[0].ToUpper().Equals("SOURCE") && words[2].ToUpper().Equals("SINK")) {
String srcId = words[1], sinkId = words[3];
NetService service = null;
foreach (NetService s in sinkServices)
if (s.Name.Equals(sinkId)) {
service = s;
break;
}
// We don't sanity check sources. Let the sink report an error, maybe the sink knows something that we don't know
if (service == null) {
response.StatusCode = (int)HttpStatusCode.NotFound;
response.StatusDescription = "Unknown sink: " + sinkId;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR);
} else {
JSONnewSession ns = new JSONnewSession();
ns.id = sendCommand(service, "SHOW " + srcId + "\n");
responseString = serializer.Serialize(ns);
}
} else {
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_CONNECT;
response.StatusCode = (int)HttpStatusCode.BadRequest;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
}
}
break;
case "DISCONNECT":
if ((request.Url.Query == null) || (request.Url.Query.Length < 2)) {
response.StatusCode = (int)HttpStatusCode.BadRequest;
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_DISCONNECT;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
} else {
String g = request.Url.Query.Substring(1);
char[] delimiters = { '=', '&' };
String[] words = g.Split(delimiters);
NetService service = null;
String sinkId = null;
if (((words.Length == 4) || (words.Length == 2)) & (words[0].ToUpper().Equals("ID"))) {
String debug = null;
foreach (JSONSession sess in sessions) {
debug = debug + " " + sess.id;
if (words[1].Equals(sess.id)) {
sinkId = sess.sinkId;
break;
}
}
if (sinkId == null) {
response.StatusDescription = "Unknown session ID: " + words[1];
response.StatusCode = (int)HttpStatusCode.NotFound;
responseString = JSONError("UNKNOWN ID: " + words[1] + " looked at " + debug);
} else {
foreach (NetService s in sinkServices)
if (s.Name.Equals(sinkId)) {
service = s;
break;
}
if (service == null) {
response.StatusDescription = "Unknown sink ID: " + sinkId;
response.StatusCode = (int)HttpStatusCode.NotFound;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR);
} else {
JSONstatus status = new JSONstatus();
status.result = sendCommand(service, "CLOSE " + words[1] + "\n");
responseString = serializer.Serialize(status);
}
}
} else {
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_DISCONNECT;
response.StatusCode = (int)HttpStatusCode.BadRequest;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
}
}
break;
case "MOVE":
if ((request.Url.Query == null) || (request.Url.Query.Length < 2)) {
response.StatusCode = (int)HttpStatusCode.BadRequest;
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_MOVE;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
} else {
String q = request.Url.Query.Substring(1);
char[] delimiters = { '=', '&' };
String[] words = q.Split(delimiters);
if (((words.Length == 10) || (words.Length == 12)) && words[0].ToUpper().Equals("SESSIONID") && words[2].ToUpper().Equals("X") && words[4].ToUpper().Equals("Y") && words[6].ToUpper().Equals("WIDTH") && words[8].ToUpper().Equals("HEIGHT")) {
NetService service = null;
String sinkId = null;
JSONSession session = null;
String sessId = words[1];
foreach (JSONSession sess in sessions)
if (sessId.Equals(sess.id)) {
sinkId = sess.sinkId;
session = sess;
break;
}
if (sinkId == null) {
response.StatusCode = (int)HttpStatusCode.NotFound;
response.StatusDescription = "Unknown session: " + sessId;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR);
} else {
foreach (NetService s in sinkServices)
if (s.Name.Equals(sinkId)) {
service = s;
break;
}
if (service == null) {
response.StatusCode = (int)HttpStatusCode.NotFound;
response.StatusDescription = "Unknown sink";
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR);
} else {
JSONstatus status = new JSONstatus();
status.result = sendCommand(service, "MOVE " + sessId + " " + words[3] + "x" + words[5] + "x" + words[7] + "x" + words[9] + "\n");
responseString = serializer.Serialize(status);
}
}
} else {
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_MOVE;
response.StatusCode = (int)HttpStatusCode.BadRequest;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
}
}
break;
case "ICONIFY":
if ((request.Url.Query == null) || (request.Url.Query.Length < 2)) {
response.StatusCode = (int)HttpStatusCode.BadRequest;
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_ICON;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
} else {
String sessId = request.Url.Query.Substring(1);
NetService service = null;
String sinkId = null;
JSONSession session = null;
foreach (JSONSession sess in sessions)
if (sessId.Equals(sess.id)) {
sinkId = sess.id;
session = sess;
break;
}
if (sinkId == null) {
response.StatusCode = (int)HttpStatusCode.NotFound;
response.StatusDescription = "Unknown session: " + sessId;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR);
} else {
foreach (NetService s in sinkServices)
if (s.Name.Equals(sinkId)) {
service = s;
break;
}
if (service == null) {
response.StatusCode = (int)HttpStatusCode.NotFound;
response.StatusDescription = "Unknown sink";
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR);
} else {
JSONstatus status = new JSONstatus();
status.result = sendCommand(service, ((session.iconified == 0) ? "ICON " : "DICO ") + sessId + "\n");
responseString = serializer.Serialize(status);
}
}
}
break;
case "FULLSCREEN":
if ((request.Url.Query == null) || (request.Url.Query.Length < 2)) {
response.StatusCode = (int)HttpStatusCode.BadRequest;
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_FULLSCREEN;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
} else {
String sessId = request.Url.Query.Substring(1);
NetService service = null;
String sinkId = null;
JSONSession session = null;
foreach (JSONSession sess in sessions)
if (sessId.Equals(sess.id)) {
sinkId = sess.id;
session = sess;
break;
}
if (sinkId == null) {
response.StatusCode = (int)HttpStatusCode.NotFound;
response.StatusDescription = "Unknown id: " + sinkId;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR);
} else {
foreach (NetService s in sinkServices)
if (s.Name.Equals(sinkId)) {
service = s;
break;
}
if (service == null) {
response.StatusCode = (int)HttpStatusCode.NotFound;
response.StatusDescription = "Unknown sink";
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR);
} else {
JSONstatus status = new JSONstatus();
status.result = sendCommand(service, ((session.fullScreen == 0) ? "FS " : "SF ") + sessId + "\n");
responseString = serializer.Serialize(status);
}
}
}
break;
case "MASK":
case "CREATEREGION":
if ((request.Url.Query == null) || (request.Url.Query.Length < 2)) {
response.StatusCode = (int)HttpStatusCode.BadRequest;
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_MASK;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
} else {
String q = request.Url.Query.Substring(1);
char[] delimiters = { '=', '&' };
String[] words = q.Split(delimiters);
if (((words.Length == 10) || (words.Length == 12)) && words[0].ToUpper().Equals("SOURCE") && words[2].ToUpper().Equals("X") && words[4].ToUpper().Equals("Y") && words[6].ToUpper().Equals("WIDTH") && words[8].ToUpper().Equals("HEIGHT")) {
NetService service = null;
String srcId = words[1];
foreach (NetService s in sourceServices)
if (srcId.Equals(s.Name)) {
service = s;
break;
}
if (service == null) {
response.StatusCode = (int)HttpStatusCode.NotFound;
response.StatusDescription = "Unknown source: " + srcId;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR);
} else {
Int32 port = -1;
if (service.TXTRecordData != null) {
byte[] txt = service.TXTRecordData;
IDictionary dict = NetService.DictionaryFromTXTRecordData(txt);
if (dict != null) {
foreach (DictionaryEntry kvp in dict) {
String key = (String)kvp.Key;
key = key.ToUpper();
if (key.Equals("MASKPORT")) {
byte[] value = (byte[])kvp.Value;
try {
port = Convert.ToInt32(Encoding.UTF8.GetString(value));
} catch {
}
break;
}
}
}
}
if (port > 0) {
JSONstatus status = new JSONstatus();
status.result = sendCommand(service, port, "MASK " + words[3] + " " + words[5] + " " + words[7] + " " + words[9] + "\n");
responseString = serializer.Serialize(status);
} else {
response.StatusDescription = "Streamer does not support masking";
response.StatusCode = (int)HttpStatusCode.NotImplemented;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNIMPL_ERROR);
}
}
} else {
response.StatusDescription = DisplayCastGlobals.CONTROL_USAGE_MASK;
response.StatusCode = (int)HttpStatusCode.BadRequest;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_SYNTAX_ERROR);
}
}
break;
default:
response.StatusCode = (int)HttpStatusCode.BadRequest;
response.StatusDescription = "Unknown command: " + request.RawUrl;
responseString = JSONError(DisplayCastGlobals.CONTROL_JSON_UNKNOWN_ERROR + request.RawUrl + " " + cmd);
break;
}
// Now wrap in JSONP response
if (response.StatusCode == (int)HttpStatusCode.OK) {
var sb = new System.Text.StringBuilder();
var queryString = System.Web.HttpUtility.ParseQueryString(request.Url.Query);
var callback = queryString["callback"] ?? "callback";
sb.Append(callback + "(" + responseString + ");");
responseString = sb.ToString();
}
// Send the response back
byte[] buffer = System.Text.Encoding.UTF8.GetBytes(responseString);
response.ContentLength64 = buffer.Length;
response.Headers.Set(HttpResponseHeader.Server, "FXPAL DisplayCast/" + DisplayCastGlobals.DISPLAYCAST_VERSION + " and not");
response.OutputStream.Write(buffer, 0, buffer.Length);
response.Close();
}
/// <summary>
/// Utility function to wrap the error message into a JSON message.
/// </summary>
/// <param name="err"></param>
/// <returns></returns>
private String JSONError(String err)
{
JSONstatus status = new JSONstatus();
status.result = err;
return this.serializer.Serialize(status);
}
