public List <object> DeserializeFromBody(ChannelMethodInfo methodDescription, string contentType)
{
string inputRequest = string.Empty;
using (StreamReader reader = new StreamReader(_requestStream))
{
inputRequest = reader.ReadToEnd();
}
LogChannel.Write(LogSeverity.Info, $"Request body: ");
LogChannel.Write(LogSeverity.Info, inputRequest);
if (contentType == "application/xml" || contentType == "text/xml; charset=utf-8")
{
return(_services.Get <IXmlRequestService>().Deserialize(inputRequest, methodDescription));
}
else if (contentType == "application/json" || contentType == "application/json; charset=utf-8")
{
return(_services.Get <IJsonRequestService>().Deserialize(inputRequest, methodDescription));
}
else
{
throw new ChannelMethodContentTypeException("Content-type must be application/json or application/xml");
}
}
private void SetupAndInvokeGetRequest(Type channel,
MethodInfo method,
ChannelMethodDeserializerFactory dsrFactory,
HttpListenerRequest request,
HttpListenerResponse response,
ChannelMethodInfo methodDescription,
ChannelConfigurationInfo channelConfig,
List <object> channelRequestBody,
bool authenticated,
bool hasParams)
{
InitChannelMethodContext(channelConfig.Endpoint, request, response, authenticated, channelConfig.HttpMethod, channelRequestBody);
if (hasParams)
{
dsrFactory = new ChannelMethodDeserializerFactory(request.QueryString);
channelRequestBody = dsrFactory.DeserializeFromQueryParameters(methodDescription);
_requestActivator.GetActivateWithParameters(channel, method, channelRequestBody, response);
}
else
{
_requestActivator.GetActivateWithoutParameters(channel, method, response);
}
_contextProvider.DestroyChannelMethodContext(channelConfig.Endpoint);
}
public List <object> Deserialize(string inputBody, ChannelMethodInfo methodDescription)
{
XmlDocument requestXml = new XmlDocument();
requestXml.LoadXml(inputBody);
Debug.Assert(requestXml.HasChildNodes);
List <object> channelRequestBody;
if (methodDescription.Parameters.Count != 0)
{
channelRequestBody = new List <object>();
//Parameter initialization logic
foreach (ChannelMethodParameter parameter in methodDescription.Parameters)
{
Type paramType = parameter.Type; // Parameter type
string paramTypeFull = paramType.FullName; // Name of the class
string paramTypeASM = paramType.Assembly.FullName; // Name of the assembly
if (paramType == typeof(string))
{
channelRequestBody.Add(XmlTools.DeserializeString(requestXml, parameter.Name));
}
else if (paramType == typeof(int))
{
channelRequestBody.Add(XmlTools.DeserializeInt(requestXml, parameter.Name));
}
else if (paramType == typeof(double))
{
channelRequestBody.Add(XmlTools.DeserializeDouble(requestXml, parameter.Name));
}
else if (paramType == typeof(decimal))
{
channelRequestBody.Add(XmlTools.DeserializeDecimal(requestXml, parameter.Name));
}
else if (paramType == typeof(float))
{
channelRequestBody.Add(XmlTools.DeserializeFloat(requestXml, parameter.Name));
}
else if (paramType == typeof(bool))
{
channelRequestBody.Add(XmlTools.DeserializeBool(requestXml, parameter.Name));
}
else
{
channelRequestBody.Add(XmlTools.DeserializeComplex(inputBody, paramTypeASM, paramTypeFull));
}
}
}
else
{
channelRequestBody = null;
}
return(channelRequestBody);
}
public List <object> DeserializeFromQueryParameters(ChannelMethodInfo methodDescription)
{
List <object> channelRequestBody = new List <object>();
Dictionary <string, string> deserializedNameValues = new Dictionary <string, string>();
NameValueCollection urlParameters = _queryParameters;
for (int i = 0; i < urlParameters.AllKeys.Length; i++)
{
deserializedNameValues.Add(urlParameters.Keys[i].ToLower(), urlParameters[i]);
}
foreach (ChannelMethodParameter description in methodDescription.Parameters)
{
Type paramType = description.Type;
if (deserializedNameValues.Any(x => x.Key.Equals(description.Name.ToLower())))
{
KeyValuePair <string, string> exists = deserializedNameValues.FirstOrDefault(x => x.Key.Equals(description.Name.ToLower()));
if (paramType == typeof(string))
{
channelRequestBody.Add(exists.Value);
}
else if (paramType == typeof(int))
{
channelRequestBody.Add(int.Parse(exists.Value));
}
else if (paramType == typeof(double))
{
channelRequestBody.Add(double.Parse(exists.Value));
}
else if (paramType == typeof(decimal))
{
channelRequestBody.Add(decimal.Parse(exists.Value));
}
else if (paramType == typeof(float))
{
channelRequestBody.Add(float.Parse(exists.Value));
}
else if (paramType == typeof(bool))
{
channelRequestBody.Add(bool.Parse(exists.Value));
}
else
{
channelRequestBody = null;
}
}
}
return(channelRequestBody);
}
public List <ChannelDocument> GetDocumentation(AppDomain domain)
{
Debug.Assert(_services.Get <IChannelLocator>() != null);
List <Type> channels = _services.Get <IChannelLocator>().RegisteredChannels(domain);
foreach (var channel in channels)
{
ChannelDocument channelDoc = new ChannelDocument();
ChannelAttribute channelAttr = channel.GetCustomAttribute <ChannelAttribute>();
string channelDescription = channelAttr.Description == null ? string.Empty : channelAttr.Description.ToString();
string channelName = String.IsNullOrEmpty(channelAttr.Name) ? channel.Name : channelAttr.Name;
string channelRoute = $"~/channels/{channelName}";
MethodInfo[] methods = channel.GetMethods().Where(x => x.GetCustomAttribute <ChannelMethodAttribute>() != null).ToArray();
ChannelMethodDocs = new List <ChannelMethodDocument>();
foreach (var method in methods)
{
ChannelMethodDocument methodDocument = new ChannelMethodDocument();
ChannelMethodInfo description = _services.Get <IChannelMethodDescriptor>().GetMethodDescription(method);
ChannelMethodAttribute ChannelMethodAttribute = method.GetCustomAttribute <ChannelMethodAttribute>();
ChannelHttpMethod HttpMethod = ChannelMethodAttribute.HttpMethod;
string[] names = description.Parameters.Select(x => x.Name).ToArray();
Type[] types = description.Parameters.Select(x => x.Type).ToArray();
methodDocument.HttpMethod = HttpMethod;
methodDocument.InputParameters = names;
methodDocument.InputParameterTypes = types;
methodDocument.ReturnTypeName = method.ReturnType.Name;
methodDocument.ReturnType = method.ReturnType;
methodDocument.URL = $"{channelRoute}/{method.Name}/";
methodDocument.AuthSchema = ChannelMethodAttribute.Schema;
methodDocument.Description = ChannelMethodAttribute.Description; //null possibility
ChannelMethodDocs.Add(methodDocument);
}
channelDoc.Name = channel.Name;
channelDoc.Description = channelDescription; //null possibility
channelDoc.URL = channelRoute;
channelDoc.AvailableEndpoints = ChannelMethodDocs;
ChannelDocs.Add(channelDoc);
}
return(ChannelDocs);
}
private bool TryInvokeGetRequest(Type channel,
MethodInfo method,
HttpListenerRequest request,
HttpListenerResponse response,
ChannelMethodDeserializerFactory dsrFactory,
ChannelMethodInfo methodDescription,
ChannelConfigurationInfo channelConfig,
List <object> channelRequestBody,
bool authenticated)
{
try
{
if (request.QueryString.AllKeys.Length > 0)
{
SetupAndInvokeGetRequest(channel, method, dsrFactory, request, response, methodDescription, channelConfig, channelRequestBody, authenticated, true);
}
else if (request.QueryString.AllKeys.Length == 0)
{
if (methodDescription.Parameters.Count > 0)
{
StreamWriter writer = new StreamWriter(response.OutputStream);
_msgService.ExceptionHandler(writer, new TargetParameterCountException(), response);
writer.Close();
return(false);
}
SetupAndInvokeGetRequest(channel, method, dsrFactory, request, response, methodDescription, channelConfig, channelRequestBody, authenticated, false);
}
return(true);
}
catch (Exception ex)
{
using (StreamWriter writer = new StreamWriter(response.OutputStream))
{
_msgService.ExceptionHandler(writer, ex, response);
LogChannel.Write(LogSeverity.Fatal, ex.Message);
}
return(true);
}
}
public List <object> Deserialize(string inputBody, ChannelMethodInfo methodDescription)
{
List <object> parameters = new List <object>();
JObject propObject = JObject.Parse(inputBody);
Debug.Assert(propObject != null);
foreach (ChannelMethodParameter parameter in methodDescription.Parameters)
{
JProperty jProperty = propObject.Property(parameter.Name, StringComparison.OrdinalIgnoreCase);
if (jProperty != null)
{
if (jProperty.Value != null)
{
parameters.Add(jProperty.Value.ToObject(parameter.Type));
}
}
else
{
continue;
}
}
return(parameters);
}
internal void SetupAndInvokeGetRequest(Type channel,
MethodInfo method,
HttpListenerRequest request,
HttpListenerResponse response,
ChannelMethodInfo methodDescription,
ChannelConfigurationInfo channelConfig,
List <object> channelRequestBody,
bool authenticated,
bool hasParams,
CacheExecutionResult cacheExecutionResult)
{
//Context should be initialized before invoking the method because ChannelBase relies on Context
InitChannelMethodContext(channelConfig.Endpoint, request, response, authenticated, channelConfig.HttpMethod, channelRequestBody);
if (hasParams)
{
//Since request body will be processed in Heuristics if cache is enabled
//Data is already stored in Data.Parameters property of CacheExecutionResult
if (!cacheExecutionResult.DataProcessed)
{
_dsrFactory = new ChannelMethodDeserializerFactory(request.QueryString);
channelRequestBody = _dsrFactory.DeserializeFromQueryParameters(methodDescription);
}
else
{
channelRequestBody = cacheExecutionResult.Data.Parameters;
}
_requestActivator.GetActivateWithParameters(channel, method, channelRequestBody, response);
}
else
{
_requestActivator.GetActivateWithoutParameters(channel, method, response);
}
_contextProvider.DestroyChannelMethodContext(channelConfig.Endpoint);
}
public void StartListening(MethodInfo method, Type channel, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
HttpListener httpChannel = new HttpListener();
ChannelConfigurationInfo channelConfig = _configuration.Configure(httpChannel, channel, method, _baseURL);
//Keep the ChannelMethod open for new requests
while (true)
{
try
{
httpChannel.Start();
}
catch (HttpListenerException hle)
{
Console.WriteLine($"System.Net.HttpListenerException encountered on {channelConfig.MethodUrl} with reason :{hle.Message}");
return;
}
Console.WriteLine($"Listening on {channelConfig.MethodUrl}");
HttpListenerContext context = httpChannel.GetContext();
HttpListenerRequest request = context.Request;
HttpListenerResponse response = context.Response;
IChannelHeuristicContext heuristicsCtx = _services.Get <IChannelHeuristicContext>();
bool executedIfCached = ExecuteIfCached(channel, method, request, response, heuristicsCtx);
if (executedIfCached)
{
heuristicsCtx.Clear();
goto EndRequest;
}
LogChannel.Write(LogSeverity.Info, $"Request coming to {channelConfig.Endpoint.Name}");
LogChannel.Write(LogSeverity.Info, $"HttpMethod:{request.HttpMethod}");
bool authFailed = AuthenticationFailedIfRequired(context, request, response, channelConfig, out bool authenticated);
if (authFailed)
{
goto EndRequest;
}
//Check if the Http Method is correct
if (channelConfig.HttpMethod.ToString() != request.HttpMethod && channelConfig.HttpMethod != ChannelHttpMethod.Unknown)
{
_msgService.WrongHttpMethod(response, channelConfig.HttpMethod);
LogChannel.Write(LogSeverity.Error, "Wrong HttpMethod... Closing request");
goto EndRequest;
}
ChannelMethodInfo methodDescription = _channelMethodDescriptor.GetMethodDescription(method);
List <object> channelRequestBody = null;
ChannelMethodDeserializerFactory dsrFactory = null;
if (request.HttpMethod == "GET")
{
bool invoked = TryInvokeGetRequest(channel, method, request, response, dsrFactory, methodDescription, channelConfig, channelRequestBody, authenticated);
goto EndRequest;
}
//Enter only if Request Body is supplied with POST Method
if (request.HasEntityBody == true && request.HttpMethod == "POST")
{
StreamWriter writer = new StreamWriter(response.OutputStream);
try
{
dsrFactory = new ChannelMethodDeserializerFactory(request.InputStream);
channelRequestBody = dsrFactory.DeserializeFromBody(methodDescription, request.ContentType);
InitChannelMethodContext(channelConfig.Endpoint, request, response, authenticated, channelConfig.HttpMethod, channelRequestBody);
_requestActivator.PostActivate(channel, method, channelRequestBody, response);
}
catch (ChannelMethodContentTypeException cEx)
{
response.StatusCode = 400;
_msgService.ExceptionHandler(writer, cEx, response);
LogChannel.Write(LogSeverity.Error, cEx.Message);
}
catch (ChannelMethodParameterException pEx)
{
response.StatusCode = 400;
_msgService.ExceptionHandler(writer, pEx, response);
LogChannel.Write(LogSeverity.Error, pEx.Message);
}
catch (TargetParameterCountException tEx)
{
response.StatusCode = 400;
_msgService.ExceptionHandler(writer, tEx, response);
LogChannel.Write(LogSeverity.Error, tEx.Message);
}
catch (Exception ex)
{
response.StatusCode = 500;
_msgService.ExceptionHandler(writer, ex, response);
LogChannel.Write(LogSeverity.Fatal, ex.Message);
}
finally
{
_contextProvider.DestroyChannelMethodContext(channelConfig.Endpoint);
writer.Flush();
writer.Close();
}
}
EndRequest:
LogChannel.Write(LogSeverity.Debug, "Request finished...");
LogChannel.Write(LogSeverity.Debug, "Closing the response");
response.Close();
}
}
internal void TryInvokePostRequest(Type channel,
MethodInfo method,
HttpListenerRequest request,
HttpListenerResponse response,
List <object> channelRequestBody,
ChannelMethodInfo methodDescription,
ChannelConfigurationInfo channelConfig,
bool authenticated,
CacheExecutionResult cacheExecutionResult)
{
StreamWriter writer = new StreamWriter(response.OutputStream);
try
{
//Since request body will be processed in Heuristics if cache is enabled
//InputStream is flushed and data is already stored in Data.Parameters
//property of CacheExecutionResult
if (!cacheExecutionResult.DataProcessed)
{
_dsrFactory = new ChannelMethodDeserializerFactory(request.InputStream);
channelRequestBody = _dsrFactory.DeserializeFromBody(methodDescription, request.ContentType);
}
else
{
channelRequestBody = cacheExecutionResult.Data.Parameters;
}
InitChannelMethodContext(channelConfig.Endpoint, request, response, authenticated, channelConfig.HttpMethod, channelRequestBody);
_requestActivator.PostActivate(channel, method, channelRequestBody, response);
}
catch (ChannelMethodContentTypeException cEx)
{
response.StatusCode = 400;
_msgService.ExceptionHandler(writer, cEx, response);
LogChannel.Write(LogSeverity.Error, cEx.Message);
}
catch (ChannelMethodParameterException pEx)
{
response.StatusCode = 400;
_msgService.ExceptionHandler(writer, pEx, response);
LogChannel.Write(LogSeverity.Error, pEx.Message);
}
catch (TargetParameterCountException tEx)
{
response.StatusCode = 400;
_msgService.ExceptionHandler(writer, tEx, response);
LogChannel.Write(LogSeverity.Error, tEx.Message);
}
catch (Exception ex)
{
response.StatusCode = 500;
_msgService.ExceptionHandler(writer, ex, response);
LogChannel.Write(LogSeverity.Fatal, ex.Message);
}
finally
{
_contextProvider.DestroyChannelMethodContext(channelConfig.Endpoint);
writer.Flush();
writer.Close();
}
}
public void Start()
{
State = EntityState.Starting;
StateName = Enum.GetName(typeof(EntityState), EntityState.Starting);
_httpListener = new HttpListener();
ChannelConfigurationInfo channelConfig = _configuration.Configure(_httpListener, _channel, _method, _baseURL);
Url = channelConfig.MethodUrl;
//Keep the ChannelMethod open for new requests
while (true)
{
try
{
_httpListener.Start();
State = EntityState.Running;
StateName = Enum.GetName(typeof(EntityState), EntityState.Running);
}
catch (HttpListenerException hle)
{
Console.WriteLine($"System.Net.HttpListenerException encountered on {channelConfig.MethodUrl} with reason :{hle.Message}");
return;
}
if (!_isManaged)
{
Console.WriteLine($"Listening on {Url}");
}
HttpListenerContext context = _httpListener.GetContext();
HttpListenerRequest request = context.Request;
HttpListenerResponse response = context.Response;
IChannelHeuristicContext heuristicsCtx = _services.Get <IChannelHeuristicContext>();
LogChannel.Write(LogSeverity.Info, $"Request coming to {channelConfig.Endpoint.Name}");
LogChannel.Write(LogSeverity.Info, $"HttpMethod:{request.HttpMethod}");
ChannelAuthenticationInspector authInspector = new ChannelAuthenticationInspector(_authenticationService, _msgService, _settings, _session, _basicAuthenticationMethod, _tokenAuthenticationMethod);
//Even if method is cached check authenticaion first
bool authFailed = authInspector.AuthenticationFailedIfRequired(context, request, response, channelConfig, out bool authenticated);
if (authFailed)
{
goto EndRequest;
}
List <object> channelRequestBody = null;
ChannelMethodCacheInspector cacheInspector = new ChannelMethodCacheInspector(_msgService, _heuristics);
CacheExecutionResult cacheExecutionResult = cacheInspector.ExecuteIfCached(_channel, _method, request, response, heuristicsCtx);
if (cacheExecutionResult.Executed)
{
heuristicsCtx.Clear();
goto EndRequest;
}
if (channelConfig.HttpMethod.ToString() != request.HttpMethod && channelConfig.HttpMethod != ChannelHttpMethod.Unknown)
{
_msgService.WrongHttpMethod(response, channelConfig.HttpMethod);
LogChannel.Write(LogSeverity.Error, "Wrong HttpMethod... Closing request");
goto EndRequest;
}
ChannelMethodInfo methodDescription = _channelMethodDescriptor.GetMethodDescription(_method);
ChannelMethodCaller channelMethodCaller = new ChannelMethodCaller(_msgService, _contextProvider, _requestActivator);
if (request.HttpMethod == "GET")
{
channelMethodCaller.TryInvokeGetRequest(_channel, _method, request, response, methodDescription, channelConfig, channelRequestBody, authenticated, cacheExecutionResult);
goto EndRequest;
}
//Enter only if Request Body is supplied with POST Method
if (request.HasEntityBody == true && request.HttpMethod == "POST")
{
channelMethodCaller.TryInvokePostRequest(_channel, _method, request, response, channelRequestBody, methodDescription, channelConfig, authenticated, cacheExecutionResult);
}
EndRequest:
LogChannel.Write(LogSeverity.Debug, "Request finished...");
LogChannel.Write(LogSeverity.Debug, "Closing the response");
response.Close();
}
}
