private object BuildController(RouteMatch match, TcpClient client, RequestContext context)
{
ConstructorInfo constructor = match.ActionMatch.Controller.GetConstructors()
.First();
List <object> parameters = ResolveConstructorParameters(match, client, context, constructor);
object controller = constructor.Invoke(parameters.ToArray());
if (!match.ActionMatch.Controller.IsSubclassOf(typeof(ControllerBase)))
{
return(controller);
}
FieldInfo clientField = typeof(ControllerBase).GetField("client", BindingFlags.NonPublic | BindingFlags.Instance);
if (clientField != null && clientField.FieldType == typeof(TcpClient))
{
clientField.SetValue(controller, client);
}
else
{
Console.WriteLine($"Warning: Field: client could not be found on Baseclass: {nameof(ControllerBase)}.");
}
return(controller);
}
private List <object> ResolveConstructorParameters(RouteMatch match, TcpClient client, RequestContext context, ConstructorInfo constructor)
{
List <object> parameters = new List <object>();
ParameterInfo[] constructorParameters = constructor.GetParameters();
foreach (ParameterInfo currentParameter in constructorParameters)
{
object resolvedParameter = ServiceProvider.GetService(currentParameter.ParameterType);
if (resolvedParameter != null)
{
parameters.Add(resolvedParameter);
}
else if (currentParameter.ParameterType == typeof(RequestContext))
{
parameters.Add(context);
}
else if (currentParameter.ParameterType == typeof(TcpClient))
{
parameters.Add(client);
}
else if (currentParameter.ParameterType == typeof(NetworkStream))
{
parameters.Add(client.GetStream());
}
else
{
NotSupportedException innerException = new NotSupportedException(
$"Could not resolve ConstructorParameter:{currentParameter.Name} of Type:{currentParameter.ParameterType}.");
EndPointHandlerException error = BuildEndpointHandlerException(match, innerException);
throw error;
}
}
return(parameters);
}
private static byte[] ExtractFromRequestBody(RouteMatch match, RequestContext context, RequestBodyExtractor bodyExtractor, ParameterInfo actionParameter)
{
if (supportedContentTypes.Any(sct => sct.Equals(context.Content.ContentType, StringComparison.OrdinalIgnoreCase)))
{
if (bodyExtractor.BodyExtracted)
{
return(bodyExtractor.Cache.ToArray());
}
else
{
try
{
return(bodyExtractor.Extract());
}
catch (RequestBodyExtractorException bodyExtractorEx)
{
EndPointHandlerException error = BuildEndpointHandlerException(
$"Could not Resolve Action Parameter:{actionParameter.Name} of Type: {actionParameter.ParameterType}.",
match,
bodyExtractorEx
);
throw error;
}
}
}
else
{
NotSupportedException innerException = new NotSupportedException(
$"Could not Resolve Action Parameter:{actionParameter.Name} of Type: {actionParameter.ParameterType}. " +
$"Invalid Content-Type:{context.Content.ContentType}. " +
$"Supported Contenttypes are: {string.Join(',', supportedContentTypes)}");
throw BuildEndpointHandlerException(match, innerException);
}
}
private static EndPointHandlerException BuildEndpointHandlerException(string info, RouteMatch match, Exception innerException)
{
Assert.NotNull(match, nameof(match));
if (info == null)
{
return(new EndPointHandlerException($"Error Invoking Controller:{match.ActionMatch.Controller}.{match.ActionMatch.Action}.", innerException));
}
else
{
return(new EndPointHandlerException(
$"Error Invoking Controller:{match.ActionMatch.Controller}.{match.ActionMatch.Action}.{Environment.NewLine}" +
info,
innerException));
}
}
private static EndPointHandlerException BuildEndpointHandlerException(RouteMatch match, Exception innerException)
{
return(BuildEndpointHandlerException(null, match, innerException));
}
public IActionResult Invoke(RouteMatch match, TcpClient client, RequestContext context)
{
if (match is null)
{
throw new ArgumentNullException($"{nameof(match)} cannot be null.", nameof(match));
}
if (match.ActionMatch.Action is null)
{
throw new ArgumentNullException($"match.HttpMethod.Template");
}
if (match.ActionMatch.Action.ReturnType != typeof(IActionResult))
{
throw new NotSupportedException($"Invalid Match: Invalid Action ReturnType:{match.ActionMatch.Action.ReturnType}. " +
$"ReturnType must be {typeof(IActionResult)}");
}
if (match.ActionMatch.HttpMethod == null)
{
throw new ArgumentNullException($"{nameof(match)}.{nameof(match.ActionMatch.HttpMethod)} cannot be null.");
}
if (match.ActionMatch.HttpMethod.Template == null)
{
throw new ArgumentNullException($"{nameof(match)}.{nameof(match.ActionMatch.HttpMethod)}.{nameof(match.ActionMatch.HttpMethod.Template)} cannot be null.");
}
if (client is null)
{
throw new ArgumentNullException($"{nameof(client)} cannot be null.", nameof(client));
}
Assert.NotNull(context, nameof(context));
Assert.NotNull(context.Content, $"{nameof(context)}.{nameof(context.Content)}.");
Assert.NotNull(match.MatchingActionPathSegments, $"{nameof(match)}.{nameof(match.MatchingActionPathSegments)}");
Assert.NotNull(match.TemplatePathSegments, $"{nameof(match)}.{nameof(match.TemplatePathSegments)}");
Assert.That(match.MatchingActionPathSegments.Length == match.TemplatePathSegments.Length,
"Invalid match: actionPathLength must be equal to templatePathLength");
RequestBodyExtractor bodyExtractor = new RequestBodyExtractor(context);
object controller = BuildController(match, client, context);
List <object> invokeArguments = new List <object>();
foreach (ParameterInfo actionParameter in match.ActionMatch.Action.GetParameters())
{
string correspondingParameter = string.Empty;
int actionParameterIndex = Array.IndexOf(match.TemplatePathSegments, $"{{{actionParameter.Name}}}");
if (actionParameterIndex == -1)
{
if (context.Parameters.HeaderEntries.ContainsKey(actionParameter.Name))
{
correspondingParameter = ExtractFromRequestHeader(context, actionParameter);
}
else
{
byte[] bodyContent = ExtractFromRequestBody(match, context, bodyExtractor, actionParameter);
correspondingParameter = Encoding.UTF8.GetString(bodyContent);
}
}
else
{
string routeParameter = match.MatchingActionPathSegments[actionParameterIndex];
correspondingParameter = ConvertToDeserializeableString(routeParameter, actionParameter);
}
try
{
if (actionParameter.ParameterType == typeof(Guid))
{
if (Guid.TryParse(correspondingParameter, out Guid result))
{
invokeArguments.Add(result);
}
else
{
throw new EndPointHandlerException(
$"Error parsing expected Guid- Parameter: {actionParameter.Name}. "
+ $"Value: {correspondingParameter} could not be parsed."
);
}
}
else
{
object result = JsonSerializer.Deserialize(correspondingParameter, actionParameter.ParameterType);
invokeArguments.Add(result);
}
}
catch (JsonException jsonEx)
{
throw BuildEndpointHandlerException(
$"Could not Resolve Action Parameter:{actionParameter.Name} of Type: {actionParameter.ParameterType}.{Environment.NewLine}",
match,
jsonEx
);
}
}
return((IActionResult)match.ActionMatch.Action.Invoke(controller, invokeArguments.ToArray()));
}