/// <summary>
/// Remote API method execution using HTTP "post" method.
/// </summary>
private DataType ExecutePostHttpRequest <ContractType, DataType>(ViddlerMethodAttribute methodAttribute, StringDictionary parameters)
{
StringBuilder requestPath = new StringBuilder();
StringBuilder requestData = new StringBuilder();
requestPath.Append((this.EnableSsl && methodAttribute.IsSecure) ? this.SecureBaseUrl : this.BaseUrl);
requestPath.Append(methodAttribute.MethodName);
requestPath.Append(".xml");
requestData.Append("key=");
requestData.Append(this.ApiKey);
if (methodAttribute.IsSessionRequired)
{
requestData.Append("&sessionid=");
requestData.Append(this.SessionId);
}
if (parameters != null && parameters.Keys.Count > 0)
{
foreach (string key in parameters.Keys)
{
requestData.Append("&");
requestData.Append(key);
requestData.Append("=");
requestData.Append(ViddlerHelper.EncodeRequestData(parameters[key]));
}
}
byte[] postDataBytes = System.Text.Encoding.UTF8.GetBytes(requestData.ToString());
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestPath.ToString());
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.UserAgent = string.Concat("Microsoft .NET, ", this.GetType().Assembly.FullName);
request.AllowWriteStreamBuffering = true;
request.Accept = "text/xml";
request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
request.KeepAlive = true;
request.Timeout = int.MaxValue;
request.ReadWriteTimeout = int.MaxValue;
using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(postDataBytes, 0, postDataBytes.Length);
requestStream.Flush();
}
DataType responseObject = ViddlerService.HandleHttpResponse <ContractType, DataType>(request, methodAttribute, this.DumpFolder);
return(responseObject);
}
catch (System.Net.WebException exception)
{
throw ViddlerService.HandleHttpError(exception);
}
}
/// <summary>
/// Analyzes target response data object and collects properties of promitive type.
/// </summary>
internal static Dictionary <string, Type> GetExpectedPrimitiveTypeNodes(Type type)
{
Dictionary <string, Type> nodeNameCollection = new Dictionary <string, Type>();
ViddlerMethodAttribute methodAttribute = ViddlerHelper.GetMethodAttribute(type);
if (methodAttribute != null)
{
string xpath = string.Concat("/", methodAttribute.ElementName, "/");
ViddlerHelper.CollectExpectedPrimitiveTypeNodes(xpath, type, nodeNameCollection, 0);
}
return(nodeNameCollection);
}
/// <summary>
/// Analyzes target response data object and collects properties of promitive type.
/// </summary>
private static void CollectExpectedPrimitiveTypeNodes(string xpath, Type currentType, Dictionary <string, Type> nodeNameCollection, int depth)
{
if (depth > 10)
{
throw new StackOverflowException(string.Concat("Potential stack overflow due to recursively nested data types: ", xpath, "; current depth: ", depth));
}
foreach (PropertyInfo propertyInfo in currentType.GetProperties())
{
if (propertyInfo.PropertyType.IsValueType)
{
string elementName = ViddlerHelper.GetXmlElementName(propertyInfo);
if (!string.IsNullOrEmpty(elementName))
{
nodeNameCollection.Add(string.Concat(xpath, elementName), propertyInfo.PropertyType);
}
}
else if (propertyInfo.PropertyType.IsGenericType && propertyInfo.PropertyType.GetGenericTypeDefinition() == typeof(Nullable <>))
{
Type genericArgumentType = propertyInfo.PropertyType.GetGenericArguments()[0];
if (genericArgumentType.IsValueType)
{
string elementName = ViddlerHelper.GetXmlElementName(propertyInfo);
if (!string.IsNullOrEmpty(elementName))
{
nodeNameCollection.Add(string.Concat(xpath, elementName), genericArgumentType);
}
}
}
else if (propertyInfo.PropertyType.Assembly == typeof(ViddlerHelper).Assembly)
{
string elementName = ViddlerHelper.GetXmlElementName(propertyInfo);
ViddlerHelper.CollectExpectedPrimitiveTypeNodes(string.Concat(xpath, elementName, "/"), propertyInfo.PropertyType, nodeNameCollection, depth + 1);
}
else if (propertyInfo.PropertyType.IsGenericType && propertyInfo.PropertyType.GetGenericTypeDefinition() == typeof(List <>) && propertyInfo.PropertyType.GetGenericArguments()[0].Assembly == typeof(ViddlerHelper).Assembly)
{
string elementName = ViddlerHelper.GetXmlElementName(propertyInfo);
if (string.IsNullOrEmpty(elementName))
{
elementName = ViddlerHelper.GetXmlArrayName(propertyInfo);
if (!string.IsNullOrEmpty(elementName))
{
elementName = string.Concat(elementName, "/", ViddlerHelper.GetXmlArrayItemName(propertyInfo));
}
}
ViddlerHelper.CollectExpectedPrimitiveTypeNodes(string.Concat(xpath, elementName, "/"), propertyInfo.PropertyType.GetGenericArguments()[0], nodeNameCollection, depth + 1);
}
}
}
/// <summary>
/// Handles a web response from the remote server.
/// </summary>
private static DataType HandleHttpResponse <ContractType, DataType>(HttpWebRequest request, ViddlerMethodAttribute methodAttribute, string dumpPath)
{
DataType responseObject = default(DataType);
using (WebResponse response = request.GetResponse())
{
using (Stream responseStream = response.GetResponseStream())
{
using (MemoryStream stream = new MemoryStream())
{
int count;
byte[] buffer = new byte[1024];
do
{
count = responseStream.Read(buffer, 0, 1024);
stream.Write(buffer, 0, count);
} while (count > 0); // copy response stream to "seek-enabled" stream
if (!string.IsNullOrEmpty(dumpPath))
{
ViddlerService.DumpResposeToFile(dumpPath, stream, methodAttribute.MethodName, request.RequestUri.ToString());
}
stream.Position = 0;
string messageType = string.Empty;
XmlReaderSettings readerSettings = new XmlReaderSettings();
readerSettings.CloseInput = false;
readerSettings.IgnoreComments = true;
readerSettings.IgnoreProcessingInstructions = true;
using (XmlReader reader = XmlReader.Create(stream, readerSettings))
{
if (reader.MoveToContent() == XmlNodeType.Element)
{
messageType = reader.LocalName;
}
}
stream.Position = 0;
if (messageType.Equals(methodAttribute.ElementName, StringComparison.Ordinal))
{
try
{
XmlSerializer serializer = new XmlSerializer(typeof(ContractType));
responseObject = (DataType)serializer.Deserialize(stream);
}
catch (Exception exception)
{
if (exception.InnerException != null && exception.InnerException.GetType() == typeof(System.FormatException)) // XmlSerializer has problems with parsing primitive types - removing empty nodes, which are deserialized to properties of primitive type
{
stream.Position = 0;
Dictionary <string, Type> nodesToCheck = ViddlerHelper.GetExpectedPrimitiveTypeNodes(typeof(ContractType));
XmlDocument responseXml = new XmlDocument();
responseXml.PreserveWhitespace = true;
responseXml.Load(stream);
foreach (string node in nodesToCheck.Keys)
{
foreach (XmlNode xmlNode in responseXml.SelectNodes(node))
{
if (string.IsNullOrEmpty(xmlNode.InnerText.Trim()))
{
xmlNode.ParentNode.RemoveChild(xmlNode);
}
}
}
using (MemoryStream xmlStream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(responseXml.OuterXml)))
{
XmlSerializer serializer = new XmlSerializer(typeof(ContractType));
responseObject = (DataType)serializer.Deserialize(xmlStream);
}
}
else
{
throw;
}
}
}
else if (messageType.Equals("error", StringComparison.Ordinal))
{
XmlSerializer serializer = new XmlSerializer(typeof(ViddlerResponseError));
ViddlerResponseError errorObject = (ViddlerResponseError)serializer.Deserialize(stream);
throw new ViddlerRequestException(errorObject, null);
}
else
{
XmlDocument responseXml = new XmlDocument();
responseXml.PreserveWhitespace = true;
responseXml.Load(stream);
throw new System.InvalidOperationException(responseXml.OuterXml);
}
}
}
}
return(responseObject);
}
/// <summary>
/// Remote API method execution.
/// </summary>
internal DataType ExecuteHttpRequest <ContractType, DataType>(StringDictionary parameters, string fileName, Stream fileStream, Data.UploadEndPoint endPoint)
{
ViddlerMethodAttribute methodAttribute = ViddlerHelper.GetMethodAttribute(typeof(ContractType));
DataType responseObject = default(DataType);
try
{
if (methodAttribute == null)
{
throw new System.InvalidOperationException(string.Concat("ViddlerMethodAttribute missing for type \"", typeof(ContractType).ToString(), "\"."));
}
if (this.BeginRequest != null)
{
this.BeginRequest(this, new ViddlerRequestEventArgs(typeof(ContractType), parameters, (fileStream != null)));
}
if (methodAttribute.IsSessionRequired && !this.IsAuthenticated)
{
throw new System.InvalidOperationException("The current method requires authenticated user.");
}
if (fileStream != null && !fileStream.CanSeek)
{
throw new System.ArgumentException("The file stream does not support seeking.", "fileStream");
}
switch (methodAttribute.RequestType)
{
case ViddlerRequestType.Post:
{
responseObject = this.ExecutePostHttpRequest <ContractType, DataType>(methodAttribute, parameters);
break;
}
case ViddlerRequestType.Multipart:
{
responseObject = this.ExecuteMultipartHttpRequest <ContractType, DataType>(methodAttribute, parameters, fileName, fileStream, endPoint);
break;
}
default:
{
responseObject = this.ExecuteGetHttpRequest <ContractType, DataType>(methodAttribute, parameters);
break;
}
}
if (this.EndRequest != null)
{
this.EndRequest(this, new ViddlerRequestEventArgs(typeof(ContractType), parameters, (fileStream != null)));
}
}
catch (Exception exception)
{
if (this.Error != null)
{
this.Error(this, new ViddlerRequestErrorEventArgs(typeof(ContractType), parameters, (fileStream != null), exception));
}
else
{
throw;
}
}
return(responseObject);
}
