public long ReadPacketSize(byte[] packetData)
{
// Attempt an initial parse to get the headers.
CommandServerPacket packet = new CommandServerPacket();
CommandServerPacketSerializer.Parse(packet, packetData);
long length = 0;
// If the headers contain a content-length variable, use that.
if (packet.Headers[HttpRequestHeader.ContentLength] != null) {
// todo Potential issues with content encoding?
if (long.TryParse(packet.Headers[HttpRequestHeader.ContentLength], out length) == false) {
length = packetData.Length;
}
else {
length += packet.Header.Length;
}
// The header/content separator.
length += 4;
}
return length;
}
/// <summary>
/// Takes in a request and does it's best to convert it to a command within Potato for execution.
/// </summary>
/// <param name="request">The http request for this command</param>
/// <returns>The deserialized command or null if an error occured during deserialization</returns>
public static ICommand DeserializeCommand(CommandServerPacket request) {
ICommand command = null;
try {
switch (request.Headers[HttpRequestHeader.ContentType].ToLower()) {
default:
command = Core.Shared.Serialization.JsonSerialization.Minimal.Deserialize<Command>(request.Content);
break;
}
if (command != null) {
command.Origin = CommandOrigin.Remote;
HttpCommandRequest commandRequest = new HttpCommandRequest() {
Content = new List<String>() {
request.Header,
request.Content
},
Packets = new List<IPacket>() {
request.Packet
}
};
commandRequest.AppendTags(request.Headers);
commandRequest.AppendTags(request.Query);
command.Request = commandRequest;
}
}
catch {
command = null;
}
return command;
}
public IPacketWrapper Deserialize(byte[] packetData)
{
CommandServerPacket packet = new CommandServerPacket();
CommandServerPacketSerializer.Parse(packet, packetData);
packet.Query = CommandServerPacketSerializer.CombineNameValueCollections(CommandServerPacketSerializer.ParseGet(packet), CommandServerPacketSerializer.ParsePost(packet));
return packet;
}
/// <summary>
/// Serializes all of the header data to a byte array for transfer.
/// </summary>
/// <param name="packet"></param>
/// <param name="content"></param>
/// <returns></returns>
protected byte[] SerializeHeader(CommandServerPacket packet, byte[] content)
{
StringBuilder builder = new StringBuilder();
// Ensure a couple of headers are through..
packet.Headers[HttpRequestHeader.Connection] = "close";
packet.Headers[HttpRequestHeader.ContentLength] = content.Length.ToString(CultureInfo.InvariantCulture);
builder.AppendFormat("HTTP/{0}.{1} {2} {3}\r\n", packet.ProtocolVersion.Major, packet.ProtocolVersion.Minor, (int)packet.StatusCode, packet.StatusCode);
builder.Append(packet.Headers);
// Already adds the double new lines.
return Encoding.UTF8.GetBytes(builder.ToString());
}
/// <summary>
/// Serializes the content to a byte array, optionally compressing it if the client has sent
/// through that it accepts the encoding.
/// </summary>
/// <param name="packet"></param>
/// <returns></returns>
protected byte[] SerializeContent(CommandServerPacket packet)
{
byte[] data = Encoding.UTF8.GetBytes(packet.Content);
if (packet.Headers[HttpRequestHeader.ContentEncoding] != null) {
String contentEncoding = packet.Headers[HttpRequestHeader.ContentEncoding].ToLowerInvariant();
if (contentEncoding.Contains("gzip") == true) {
data = CommandServerPacketSerializer.GzipCompress(data);
}
else if (contentEncoding.Contains("deflate") == true) {
data = CommandServerPacketSerializer.DeflateCompress(data);
}
}
return data;
}
protected static NameValueCollection ParsePost(CommandServerPacket packet)
{
NameValueCollection query = new NameValueCollection();
if (packet.Content != null) {
query = HttpUtility.ParseQueryString(packet.Content);
}
return query;
}
protected static NameValueCollection ParseGet(CommandServerPacket packet)
{
return HttpUtility.ParseQueryString(packet.Request.Query);
}
protected static void Parse(CommandServerPacket packet, byte[] packetData)
{
String[] packetStringData = Regex.Split(Encoding.UTF8.GetString(packetData), @"\r\n\r\n");
packet.Header = packetStringData.FirstOrDefault();
// Fetch the rest of the content data for later.
packet.Content = packetStringData.LastOrDefault();
if (packet.Header != null) {
string[] headers = packet.Header.Split(new [] {"\r\n"}, StringSplitOptions.RemoveEmptyEntries);
if (headers.Length > 0) {
List<String> status = headers.First().Wordify();
var headerValues = packet.Header.Split(new [] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries).Skip(1).ToDictionary(
line => (line.Split(new[] { ":" }, 2, StringSplitOptions.RemoveEmptyEntries).FirstOrDefault() ?? "").Trim(),
line => (line.Split(new[] { ":" }, 2, StringSplitOptions.RemoveEmptyEntries).LastOrDefault() ?? "").Trim()
);
if (status.Count == 3 && headerValues.ContainsKey("Host") == true) {
packet.Request = new Uri("http://" + headerValues["Host"] + status[1]);
packet.Method = status[0];
packet.ProtocolVersion = new Version(status[2].Replace("HTTP/", ""));
foreach (var header in headerValues) {
try {
packet.Headers.Set(header.Key, header.Value);
}
catch {
packet.Headers.Set(header.Key, "");
}
}
}
}
}
}
/// <summary>
/// Serializes the result of the issued command back into the http response for the user.
/// </summary>
/// <param name="contentType">The content type to serialize the response to</param>
/// <param name="response">The existing response packet to be modified with additional data/changes</param>
/// <param name="result">The result of the command issued in the request</param>
/// <returns>The existing response packet, modified with the result of the command execution.</returns>
public static CommandServerPacket CompleteResponsePacket(String contentType, CommandServerPacket response, ICommandResult result) {
switch (contentType) {
case Mime.ApplicationJavascript:
case Mime.TextCss:
case Mime.TextHtml:
response.Headers.Add(HttpRequestHeader.ContentType, contentType);
response.Content = result.Now.Content != null ? result.Now.Content.FirstOrDefault() : "";
response.StatusCode = HttpStatusCode.OK;
break;
default:
response.Headers.Add(HttpRequestHeader.ContentType, Mime.ApplicationJson);
using (StringWriter writer = new StringWriter()) {
Core.Shared.Serialization.JsonSerialization.Minimal.Serialize(writer, result);
response.Content = writer.ToString();
}
response.StatusCode = HttpStatusCode.OK;
break;
}
return response;
}
protected virtual void OnPacketReceived(IClient client, CommandServerPacket request)
{
var handler = PacketReceived;
if (handler != null) {
handler(client, request);
}
}
/// <summary>
/// Respondes to a packet, making sure the response matches the request.
/// We've purposfully allowed direct packets to be sent in case we needed
/// to deliberately bypass some of these.
/// </summary>
/// <param name="sender">The client that received the response.</param>
/// <param name="request">The original packet received by the listener.</param>
/// <param name="response">The response to send to the server.</param>
public void Respond(IClient sender, CommandServerPacket request, CommandServerPacket response)
{
response.Method = request.Method;
response.ProtocolVersion = request.ProtocolVersion;
if (request.Headers[HttpRequestHeader.AcceptEncoding] != null) {
String acceptEncoding = request.Headers[HttpRequestHeader.AcceptEncoding].ToLowerInvariant();
if (acceptEncoding.Contains("gzip") == true) {
response.Headers[HttpRequestHeader.ContentEncoding] = "gzip";
}
else if (acceptEncoding.Contains("deflate") == true) {
response.Headers[HttpRequestHeader.ContentEncoding] = "deflate";
}
}
sender.Send(response);
}
/// <summary>
/// Called when a packet is recieved from the listening command server.
/// </summary>
/// <param name="client">The client to send back the response</param>
/// <param name="request">The request packet recieved</param>
public void OnPacketReceived(IClient client, CommandServerPacket request) {
CommandServerPacket response = new CommandServerPacket() {
Packet = {
Type = PacketType.Response,
Origin = PacketOrigin.Client,
},
ProtocolVersion = request.ProtocolVersion,
Method = request.Method,
StatusCode = HttpStatusCode.NotFound,
Headers = new WebHeaderCollection() {
{ HttpRequestHeader.Connection, "close" }
}
};
ICommand command = CommandServerSerializer.DeserializeCommand(request);
if (command != null) {
ICommandResult authentication = this.Authenticate(request, command);
if (authentication.Success == true) {
// If all they wanted to do was check the authentication..
if (String.CompareOrdinal(command.Name, CommandType.SecurityAccountAuthenticate.ToString()) == 0 || String.CompareOrdinal(command.Name, CommandType.SecurityAccountAuthenticateToken.ToString()) == 0) {
// Success
response = CommandServerSerializer.CompleteResponsePacket(CommandServerSerializer.ResponseContentType(command), response, authentication);
}
else {
// Propagate their command
ICommandResult result = this.Tunnel(command);
response = CommandServerSerializer.CompleteResponsePacket(CommandServerSerializer.ResponseContentType(command), response, result);
}
}
else {
// They are not authorized to login or issue this command.
response = CommandServerSerializer.CompleteResponsePacket(CommandServerSerializer.ResponseContentType(command), response, authentication);
}
}
else {
// Something wrong during deserialization, issue a bad request.
response.StatusCode = HttpStatusCode.BadRequest;
}
this.CommandServerListener.Respond(client, request, response);
}
/// <summary>
/// Authenticate the command given the request information.
/// </summary>
/// <remarks>
/// <para>This command only checks if the user is authenticated with our system, not if they can execute the command. This is accomplished while executing the command.</para>
/// </remarks>
/// <param name="request">The request information</param>
/// <param name="command">The command to authenticate</param>
/// <returns>The result of authentication</returns>
protected ICommandResult Authenticate(CommandServerPacket request, ICommand command) {
ICommandResult result = null;
if (String.IsNullOrEmpty(command.Authentication.Username) == false && String.IsNullOrEmpty(command.Authentication.PasswordPlainText) == false) {
result = this.Shared.Security.Tunnel(CommandBuilder.SecurityAccountAuthenticate(command.Authentication.Username, command.Authentication.PasswordPlainText, this.ExtractIdentifer(request)).SetOrigin(CommandOrigin.Remote));
}
else if (command.Authentication.TokenId != Guid.Empty && String.IsNullOrEmpty(command.Authentication.Token) == false) {
result = this.Shared.Security.Tunnel(CommandBuilder.SecurityAccountAuthenticateToken(command.Authentication.TokenId, command.Authentication.Token, this.ExtractIdentifer(request)).SetOrigin(CommandOrigin.Remote));
}
else {
result = new CommandResult() {
Success = false,
CommandResultType = CommandResultType.Failed,
Message = "Invalid username or password"
};
}
return result;
}
/// <summary>
/// Pulls the identifer out of the request (endpoint address)
/// </summary>
/// <param name="request">The request received from the client</param>
/// <returns>The extracted identifer or an empty string if none exists</returns>
protected String ExtractIdentifer(CommandServerPacket request) {
var identifer = "";
if (request != null && request.Packet != null && request.Packet.RemoteEndPoint != null && request.Packet.RemoteEndPoint.Address != null) {
identifer = request.Packet.RemoteEndPoint.Address.ToString();
}
return identifer;
}
