/// <summary>
/// Called after an inbound message has been received but before the message is dispatched to the intended operation.
/// </summary>
/// <param name="request">The request message.</param>
/// <param name="channel">The incoming channel.</param>
/// <param name="instanceContext">The current service instance.</param>
/// <returns>The object used to correlate state. This object is passed back in the <see cref="M:System.ServiceModel.Dispatcher.IDispatchMessageInspector.BeforeSendReply(System.ServiceModel.Channels.Message@,System.Object)" /> method.</returns>
public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
{
if (!request.Properties.ContainsKey("Via"))
{
return(request); // Nothing much we can do here
}
if (!request.Properties.ContainsKey("httpRequest"))
{
return(request); // Same here
}
var httpRequest = request.Properties["httpRequest"] as HttpRequestMessageProperty;
if (httpRequest == null)
{
return(request);
}
var httpMethod = httpRequest.Method.ToUpper();
var uri = request.Properties["Via"] as Uri;
if (uri == null)
{
return(request); // Still nothing much we can do
}
var url = uri.AbsoluteUri;
var urlFragment = url;
if (urlFragment.ToLower().StartsWith(_rootUrlLower))
{
urlFragment = urlFragment.Substring(_rootUrlLower.Length);
}
var operationInfo = RestHelper.GetMethodNameFromUrlFragmentAndContract(urlFragment, httpMethod, _contractType);
var urlParameters = RestHelper.GetUrlParametersFromUrlFragmentAndContract(urlFragment, httpMethod, _contractType);
if (httpMethod == "GET")
{
// TODO: Support GET if at all possible
throw new Exception("REST-GET operations are not currently supported in the chosen hosting environment. Please use a different HTTP Verb, or host in a different environment (such as WebApi). We hope to add this feature in a future version.");
// This is a REST GET operation. Therefore, there is no posted message. Instead, we have to decode the input parameters from the URL
var parameters = operationInfo.GetParameters();
if (parameters.Length != 1)
{
throw new NotSupportedException("Only service methods/operations with a single input parameter can be mapped to REST-GET operations. Method " + operationInfo.Name + " has " + parameters.Length + " parameters. Consider changing the method to have a single object with multiple properties instead.");
}
var parameterType = parameters[0].ParameterType;
var parameterInstance = Activator.CreateInstance(parameterType);
foreach (var propertyName in urlParameters.Keys)
{
var urlProperty = parameterType.GetProperty(propertyName);
if (urlProperty == null)
{
continue;
}
urlProperty.SetValue(parameterInstance, urlParameters[propertyName], null);
}
// Seralize the object back into a new request message
// TODO: We only need to do this for methods OTHER than GET
var format = GetMessageContentFormat(request);
switch (format)
{
case WebContentFormat.Xml:
var xmlStream = new MemoryStream();
var xmlSerializer = new DataContractSerializer(parameterInstance.GetType());
xmlSerializer.WriteObject(xmlStream, parameterInstance);
var xmlReader = XmlDictionaryReader.CreateTextReader(StreamHelper.ToArray(xmlStream), XmlDictionaryReaderQuotas.Max);
var newXmlMessage = Message.CreateMessage(xmlReader, int.MaxValue, request.Version);
newXmlMessage.Properties.CopyProperties(request.Properties);
newXmlMessage.Headers.CopyHeadersFrom(request.Headers);
if (format == WebContentFormat.Default)
{
if (newXmlMessage.Properties.ContainsKey(WebBodyFormatMessageProperty.Name))
{
newXmlMessage.Properties.Remove(WebBodyFormatMessageProperty.Name);
}
newXmlMessage.Properties.Add(WebBodyFormatMessageProperty.Name, WebContentFormat.Xml);
}
request = newXmlMessage;
break;
case WebContentFormat.Default:
case WebContentFormat.Json:
var jsonStream = new MemoryStream();
var serializer = new DataContractJsonSerializer(parameterInstance.GetType());
serializer.WriteObject(jsonStream, parameterInstance);
var jsonReader = JsonReaderWriterFactory.CreateJsonReader(StreamHelper.ToArray(jsonStream), XmlDictionaryReaderQuotas.Max);
var newMessage = Message.CreateMessage(jsonReader, int.MaxValue, request.Version);
newMessage.Properties.CopyProperties(request.Properties);
newMessage.Headers.CopyHeadersFrom(request.Headers);
if (format == WebContentFormat.Default)
{
if (newMessage.Properties.ContainsKey(WebBodyFormatMessageProperty.Name))
{
newMessage.Properties.Remove(WebBodyFormatMessageProperty.Name);
}
newMessage.Properties.Add(WebBodyFormatMessageProperty.Name, WebContentFormat.Json);
}
request = newMessage;
break;
default:
throw new NotSupportedException("Mesage format " + format.ToString() + " is not supported form REST/JSON operations");
}
}
return(null);
}
/// <summary>
/// Inspects the URL fragment, trims the method name (if appropriate) and returns the remaining parameters as a dictionary
/// of correlating property names and their values
/// </summary>
/// <param name="urlFragment">The URL fragment.</param>
/// <param name="httpMethod">The HTTP method.</param>
/// <param name="contractType">Service contract types.</param>
/// <returns>Dictionary of property values</returns>
public static Dictionary <string, object> GetUrlParametersFromUrlFragmentAndContract(string urlFragment, string httpMethod, Type contractType)
{
if (urlFragment.StartsWith("/"))
{
urlFragment = urlFragment.Substring(1);
}
var firstParameter = string.Empty;
if (urlFragment.IndexOf("/", StringComparison.Ordinal) > -1)
{
firstParameter = urlFragment.Substring(0, urlFragment.IndexOf("/", StringComparison.Ordinal));
}
else if (!string.IsNullOrEmpty(urlFragment))
{
firstParameter = urlFragment;
}
var methods = ObjectHelper.GetAllMethodsForInterface(contractType);
MethodInfo foundMethod = null;
foreach (var method in methods)
{
var restAttribute = GetRestAttribute(method);
var httpMethodForMethod = restAttribute.Method.ToString().ToUpper();
if (!string.Equals(httpMethod, httpMethodForMethod, StringComparison.OrdinalIgnoreCase))
{
continue;
}
var methodName = method.Name;
if (!string.IsNullOrEmpty(restAttribute.Name))
{
methodName = restAttribute.Name;
}
if (!string.Equals(methodName, firstParameter, StringComparison.OrdinalIgnoreCase))
{
continue;
}
urlFragment = urlFragment.Substring(methodName.Length);
if (urlFragment.StartsWith("/"))
{
urlFragment = urlFragment.Substring(1);
}
foundMethod = method;
break; // We found our methoid
}
if (foundMethod == null) // We haven't found our method yet. If there is a default method (a method with an empty REST name) that matches the HTTP method, we will use that instead
{
foreach (var method in methods)
{
var restAttribute = GetRestAttribute(method);
if (restAttribute.Name != "")
{
continue;
}
var httpMethodForMethod = restAttribute.Method.ToString().ToUpper();
if (!string.Equals(httpMethod, httpMethodForMethod, StringComparison.OrdinalIgnoreCase))
{
continue;
}
foundMethod = method;
break; // We found our methoid
}
}
if (foundMethod == null)
{
return(new Dictionary <string, object>()); // We didn't find a match, therefore, we can't map anything
}
var foundMethodParameters = foundMethod.GetParameters();
if (foundMethodParameters.Length != 1)
{
return(new Dictionary <string, object>()); // The method signature has multiple parameters, so we can't handle it (Note: Other code in the chain will probably throw an exception about it, so we just return out here as we do not want duplicate exceptions)
}
var firstParameterType = foundMethodParameters[0].ParameterType;
// Ready to extract the parameters
var inlineParameterString = string.Empty;
var namedParameterString = string.Empty;
var separatorPosition = urlFragment.IndexOf("?", StringComparison.Ordinal);
if (separatorPosition > -1)
{
inlineParameterString = urlFragment.Substring(0, separatorPosition);
namedParameterString = urlFragment.Substring(separatorPosition + 1);
}
else
{
if (urlFragment.IndexOf("=", StringComparison.Ordinal) > -1)
{
namedParameterString = urlFragment;
}
else
{
inlineParameterString = urlFragment;
}
}
var dictionary = new Dictionary <string, object>();
// Parsing the inline parameters
if (!string.IsNullOrEmpty(inlineParameterString))
{
var inlineParameters = inlineParameterString.Split('/');
var inlineProperties = RestHelper.GetOrderedInlinePropertyList(firstParameterType);
for (var propertyCounter = 0; propertyCounter < inlineParameters.Length; propertyCounter++)
{
if (propertyCounter >= inlineProperties.Count)
{
break; // We overshot the available parameters for some reason
}
var parameterString = HttpHelper.UrlDecode(inlineParameters[propertyCounter]);
var parameterValue = ConvertValue(parameterString, inlineProperties[propertyCounter].PropertyType);
dictionary.Add(inlineProperties[propertyCounter].Name, parameterValue);
}
}
// Parsing the named parameters
if (!string.IsNullOrEmpty(namedParameterString))
{
var parameterElements = namedParameterString.Split('&');
foreach (var parameterElement in parameterElements)
{
var parameterNameValuePair = parameterElement.Split('=');
if (parameterNameValuePair.Length != 2)
{
continue;
}
var currentProperty = firstParameterType.GetProperty(parameterNameValuePair[0]);
if (currentProperty == null)
{
continue;
}
var currentPropertyString = HttpHelper.UrlDecode(parameterNameValuePair[1]);
var currentPropertyValue = ConvertValue(currentPropertyString, currentProperty.PropertyType);
dictionary.Add(parameterNameValuePair[0], currentPropertyValue);
}
}
return(dictionary);
}
