using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; using System.Xml; using Emby.Dlna.Didl; using MediaBrowser.Controller.Configuration; using MediaBrowser.Controller.Extensions; using MediaBrowser.Model.Xml; using Microsoft.Extensions.Logging; namespace Emby.Dlna.Service { public abstract class BaseControlHandler { private const string NS_SOAPENV = "http://schemas.xmlsoap.org/soap/envelope/"; protected readonly IServerConfigurationManager Config; protected readonly ILogger _logger; protected readonly IXmlReaderSettingsFactory XmlReaderSettingsFactory; protected BaseControlHandler(IServerConfigurationManager config, ILogger logger, IXmlReaderSettingsFactory xmlReaderSettingsFactory) { Config = config; _logger = logger; XmlReaderSettingsFactory = xmlReaderSettingsFactory; } public ControlResponse ProcessControlRequest(ControlRequest request) { try { var enableDebugLogging = Config.GetDlnaConfiguration().EnableDebugLog; if (enableDebugLogging) { LogRequest(request); } var response = ProcessControlRequestInternal(request); if (enableDebugLogging) { LogResponse(response); } return response; } catch (Exception ex) { _logger.LogError(ex, "Error processing control request"); return new ControlErrorHandler().GetResponse(ex); } } private ControlResponse ProcessControlRequestInternal(ControlRequest request) { ControlRequestInfo requestInfo = null; using (var streamReader = new StreamReader(request.InputXml)) { var readerSettings = XmlReaderSettingsFactory.Create(false); readerSettings.CheckCharacters = false; readerSettings.IgnoreProcessingInstructions = true; readerSettings.IgnoreComments = true; using (var reader = XmlReader.Create(streamReader, readerSettings)) { requestInfo = ParseRequest(reader); } } _logger.LogDebug("Received control request {0}", requestInfo.LocalName); var result = GetResult(requestInfo.LocalName, requestInfo.Headers); var settings = new XmlWriterSettings { Encoding = Encoding.UTF8, CloseOutput = false }; StringWriter builder = new StringWriterWithEncoding(Encoding.UTF8); using (XmlWriter writer = XmlWriter.Create(builder, settings)) { writer.WriteStartDocument(true); writer.WriteStartElement("SOAP-ENV", "Envelope", NS_SOAPENV); writer.WriteAttributeString(string.Empty, "encodingStyle", NS_SOAPENV, "http://schemas.xmlsoap.org/soap/encoding/"); writer.WriteStartElement("SOAP-ENV", "Body", NS_SOAPENV); writer.WriteStartElement("u", requestInfo.LocalName + "Response", requestInfo.NamespaceURI); foreach (var i in result) { writer.WriteStartElement(i.Key); writer.WriteString(i.Value); writer.WriteFullEndElement(); } writer.WriteFullEndElement(); writer.WriteFullEndElement(); writer.WriteFullEndElement(); writer.WriteEndDocument(); } var xml = builder.ToString().Replace("xmlns:m=", "xmlns:u="); var controlResponse = new ControlResponse { Xml = xml, IsSuccessful = true }; //logger.LogDebug(xml); controlResponse.Headers.Add("EXT", string.Empty); return controlResponse; } private ControlRequestInfo ParseRequest(XmlReader reader) { reader.MoveToContent(); reader.Read(); // Loop through each element while (!reader.EOF && reader.ReadState == ReadState.Interactive) { if (reader.NodeType == XmlNodeType.Element) { switch (reader.LocalName) { case "Body": { if (!reader.IsEmptyElement) { using (var subReader = reader.ReadSubtree()) { return ParseBodyTag(subReader); } } else { reader.Read(); } break; } default: { reader.Skip(); break; } } } else { reader.Read(); } } return new ControlRequestInfo(); } private ControlRequestInfo ParseBodyTag(XmlReader reader) { var result = new ControlRequestInfo(); reader.MoveToContent(); reader.Read(); // Loop through each element while (!reader.EOF && reader.ReadState == ReadState.Interactive) { if (reader.NodeType == XmlNodeType.Element) { result.LocalName = reader.LocalName; result.NamespaceURI = reader.NamespaceURI; if (!reader.IsEmptyElement) { using (var subReader = reader.ReadSubtree()) { ParseFirstBodyChild(subReader, result.Headers); return result; } } else { reader.Read(); } } else { reader.Read(); } } return result; } private void ParseFirstBodyChild(XmlReader reader, IDictionary headers) { reader.MoveToContent(); reader.Read(); // Loop through each element while (!reader.EOF && reader.ReadState == ReadState.Interactive) { if (reader.NodeType == XmlNodeType.Element) { // TODO: Should we be doing this here, or should it be handled earlier when decoding the request? headers[reader.LocalName.RemoveDiacritics()] = reader.ReadElementContentAsString(); } else { reader.Read(); } } } private class ControlRequestInfo { public string LocalName; public string NamespaceURI; public IDictionary Headers = new Dictionary(StringComparer.OrdinalIgnoreCase); } protected abstract IEnumerable> GetResult(string methodName, IDictionary methodParams); private void LogRequest(ControlRequest request) { if (!Config.GetDlnaConfiguration().EnableDebugLog) { return; } var originalHeaders = request.Headers; var headers = string.Join(", ", originalHeaders.Select(i => string.Format("{0}={1}", i.Key, i.Value)).ToArray()); _logger.LogDebug("Control request. Headers: {0}", headers); } private void LogResponse(ControlResponse response) { if (!Config.GetDlnaConfiguration().EnableDebugLog) { return; } var originalHeaders = response.Headers; var headers = string.Join(", ", originalHeaders.Select(i => string.Format("{0}={1}", i.Key, i.Value)).ToArray()); //builder.Append(response.Xml); _logger.LogDebug("Control response. Headers: {0}", headers); } } }