/// <summary>
/// Invokes a widget synchronously.
/// </summary>
/// <param name="writer">The target text writer.</param>
/// <param name="descriptor">The widget descriptor.</param>
/// <param name="values">The set of values to provide to the widget.</param>
private void InvokeCore(TextWriter writer, WidgetDescriptor descriptor, object values = null)
{
var context = new WidgetContext(descriptor, new RouteValueDictionary(values), _viewContext, writer);
var invoker = _invokerFactory.CreateInstance(context);
invoker.Invoke(context);
}
/// <summary>
/// Finds a synchronous method to execute.
/// </summary>
/// <param name="context">The widget context.</param>
/// <param name="widgetType">The widget type.</param>
/// <returns>The synchronous method.</returns>
public static MethodInfo FindSyncMethod(WidgetContext context, TypeInfo widgetType)
{
string httpMethod = ResolveHttpMethod(context);
string state = string.Empty; // Resolve a widget state?
MethodInfo method = null;
for (int i = 0; i < SyncMethodNames.Length; i++)
{
string name = string.Format(SyncMethodNames[i], state, httpMethod);
method = GetMethod(name, widgetType);
if (method != null)
{
break;
}
}
if (method == null)
{
return null;
}
if (method.ReturnType == typeof(void))
{
throw new InvalidOperationException($"Sync method '{method.Name}' should return a value.");
}
if (method.ReturnType.IsAssignableFrom(typeof(Task)))
{
throw new InvalidOperationException($"Sync method '{method.Name}' cannot return a task.");
}
return method;
}
/// <inheritdoc />
public async Task ExecuteAsync(WidgetContext context)
{
var viewEngine = ViewEngine ?? ResolveViewEngine(context);
var viewData = ViewData ?? context.ViewData;
bool isNullOrEmptyViewName = string.IsNullOrEmpty(ViewName);
string state = null; // TODO: Resolve from value provider?
string qualifiedViewName;
if (!isNullOrEmptyViewName && (ViewName[0] == '~' || ViewName[0] == '/'))
{
qualifiedViewName = ViewName;
}
else
{
qualifiedViewName = string.Format(ViewPath, context.WidgetDescriptor.ShortName, isNullOrEmptyViewName ? (state ?? DefaultViewName) : ViewName);
}
var view = FindView(context.ViewContext, viewEngine, qualifiedViewName);
var childViewContext = new ViewContext(
context.ViewContext,
view,
viewData,
context.Writer);
using (view as IDisposable)
{
await view.RenderAsync(childViewContext);
}
}
/// <summary>
/// Finds an asynchronous method to execute.
/// </summary>
/// <param name="context">The widget context.</param>
/// <param name="widgetType">The widget type.</param>
/// <returns>The asynchronous method.</returns>
public static MethodInfo FindAsyncMethod(WidgetContext context, TypeInfo widgetType)
{
string httpMethod = ResolveHttpMethod(context);
string state = string.Empty; // Resolve a widget state?
MethodInfo method = null;
for (int i = 0; i < AsyncMethodNames.Length; i++)
{
string name = string.Format(AsyncMethodNames[i], state, httpMethod);
method = GetMethod(name, widgetType);
if (method != null)
{
break;
}
}
if (method == null)
{
return null;
}
if (!method.ReturnType.GetTypeInfo().IsGenericType
|| method.ReturnType.GetGenericTypeDefinition() != typeof(Task<>))
{
throw new InvalidOperationException($"Async method '{method.Name}' must return a task.");
}
return method;
}
/// <inheritdoc />
public virtual void Activate(object widget, WidgetContext context)
{
var propertiesToActivate = _injectActions.GetOrAdd(widget.GetType(), _getPropertiesToActivate);
for (int i = 0; i < propertiesToActivate.Length; i++)
{
var activateInfo = propertiesToActivate[i];
activateInfo.Activate(widget, context);
}
}
/// <inheritdoc />
public virtual void Activate(object widget, WidgetContext context)
{
var propertiesToActivate = _injectActions.GetOrAdd(widget.GetType(), _getPropertiesToActivate);
for (int i = 0; i < propertiesToActivate.Length; i++)
{
var activateInfo = propertiesToActivate[i];
activateInfo.Activate(widget, context);
}
}
/// <summary>
/// Creates a widget instance.
/// </summary>
/// <param name="context">The widget context.</param>
/// <returns>The wiget instance.</returns>
private object CreateWidget(WidgetContext context)
{
var services = context.ViewContext.HttpContext.RequestServices;
var widget = _typeActivatorCache.CreateInstance <object>(
services,
context.WidgetDescriptor.Type);
_widgetActivator.Activate(widget, context);
return(widget);
}
/// <summary>
/// Invokes an asynchronous method.
/// </summary>
/// <param name="method">The method to invoke.</param>
/// <param name="context">The widget context.</param>
/// <returns>The widget result.</returns>
private async Task <IWidgetResult> InvokeAsyncCore(MethodInfo method, WidgetContext context)
{
var widget = CreateWidget(context);
var arguments = await GetArgumentsAsync(context, method, context.Values);
var result = await ControllerActionExecutor.ExecuteAsync(method, widget, arguments);
var widgetResult = CoerceToWidgetResult(result);
return(widgetResult);
}
/// <inheritdocs />
public async Task <IDictionary <string, object> > BindArgumentsAsync(WidgetContext context, MethodInfo method, IDictionary <string, object> values)
{
var bindingContext = new OperationBindingContext
{
HttpContext = context.ViewContext.HttpContext,
InputFormatters = _options.InputFormatters,
MetadataProvider = _modelMetadataProvider,
ModelBinder = new CompositeModelBinder(_options.ModelBinders),
ValidatorProvider = new CompositeModelValidatorProvider(_options.ModelValidatorProviders),
ValueProvider = await CompositeValueProvider.CreateAsync(_options.ValueProviderFactories, new ValueProviderFactoryContext(context.ViewContext.HttpContext, context.ViewContext.RouteData.Values))
};
var arguments = new Dictionary <string, object>(StringComparer.Ordinal);
var parameters = method.GetParameters();
foreach (var parameter in parameters)
{
if (values.ContainsKey(parameter.Name))
{
arguments.Add(parameter.Name, values[parameter.Name]);
}
else
{
var attribute = parameter.GetCustomAttributes().OfType <IBindingSourceMetadata>().FirstOrDefault();
var bindingInfo = new BindingInfo()
{
BindingSource = attribute?.BindingSource
};
var metadata = _modelMetadataProvider.GetMetadataForType(parameter.ParameterType);
var modelBindingContext = ModelBindingContext.CreateBindingContext(
bindingContext,
context.ModelState,
metadata,
bindingInfo,
parameter.Name);
var result = await bindingContext.ModelBinder.BindModelAsync(modelBindingContext);
if (result.IsModelSet)
{
_objectModelValidator.Validate(bindingContext.ValidatorProvider, context.ModelState, modelBindingContext.ValidationState, result.Key, result.Model);
arguments.Add(parameter.Name, result.Model);
}
else
{
arguments.Add(parameter.Name, Activator.CreateInstance(parameter.ParameterType));
}
}
}
return(arguments);
}
/// <inheritdocs />
public async Task<IDictionary<string, object>> BindArgumentsAsync(WidgetContext context, MethodInfo method, IDictionary<string, object> values)
{
var bindingContext = new OperationBindingContext
{
HttpContext = context.ViewContext.HttpContext,
InputFormatters = _options.InputFormatters,
MetadataProvider = _modelMetadataProvider,
ModelBinder = new CompositeModelBinder(_options.ModelBinders),
ValidatorProvider = new CompositeModelValidatorProvider(_options.ModelValidatorProviders),
ValueProvider = await CompositeValueProvider.CreateAsync(_options.ValueProviderFactories, new ValueProviderFactoryContext(context.ViewContext.HttpContext, context.ViewContext.RouteData.Values))
};
var arguments = new Dictionary<string, object>(StringComparer.Ordinal);
var parameters = method.GetParameters();
foreach (var parameter in parameters)
{
if (values.ContainsKey(parameter.Name))
{
arguments.Add(parameter.Name, values[parameter.Name]);
}
else
{
var attribute = parameter.GetCustomAttributes().OfType<IBindingSourceMetadata>().FirstOrDefault();
var bindingInfo = new BindingInfo()
{
BindingSource = attribute?.BindingSource
};
var metadata = _modelMetadataProvider.GetMetadataForType(parameter.ParameterType);
var modelBindingContext = ModelBindingContext.CreateBindingContext(
bindingContext,
context.ModelState,
metadata,
bindingInfo,
parameter.Name);
var result = await bindingContext.ModelBinder.BindModelAsync(modelBindingContext);
if (result.IsModelSet)
{
_objectModelValidator.Validate(bindingContext.ValidatorProvider, context.ModelState, modelBindingContext.ValidationState, result.Key, result.Model);
arguments.Add(parameter.Name, result.Model);
}
else
{
arguments.Add(parameter.Name, Activator.CreateInstance(parameter.ParameterType));
}
}
}
return arguments;
}
/// <inheritdoc />
public void Invoke(WidgetContext context)
{
var method = WidgetMethodSelector.FindSyncMethod(context, context.WidgetDescriptor.Type.GetTypeInfo());
if (method == null)
{
throw new InvalidOperationException("Cannot find an appropriate method.");
}
var result = InvokeSyncCore(method, context);
result.Execute(context);
}
/// <inheritdoc />
public void Invoke(WidgetContext context)
{
var method = WidgetMethodSelector.FindSyncMethod(context, context.WidgetDescriptor.Type.GetTypeInfo());
if (method == null)
{
throw new InvalidOperationException("Cannot find an appropriate method.");
}
var result = InvokeSyncCore(method, context);
result.Execute(context);
}
/// <inheritdoc />
public void Execute(WidgetContext context)
{
var serializerSettings = _serializerSettings;
if (serializerSettings == null)
{
serializerSettings = context.ViewContext.HttpContext.RequestServices.GetRequiredService<IOptions<MvcJsonOptions>>().Value.SerializerSettings;
}
using (var jsonWriter = new JsonTextWriter(context.Writer))
{
jsonWriter.CloseOutput = false;
var jsonSerializer = JsonSerializer.Create(serializerSettings);
jsonSerializer.Serialize(jsonWriter, Value);
}
}
/// <summary>
/// Invokes a synchronous method.
/// </summary>
/// <param name="method">The method to invoke.</param>
/// <param name="context">The widget context.</param>
/// <returns>The widget result.</returns>
private IWidgetResult InvokeSyncCore(MethodInfo method, WidgetContext context)
{
var widget = CreateWidget(context);
object result = null;
var arguments = GetArgumentsAsync(context, method, context.Values).GetAwaiter().GetResult();
try
{
result = method.Invoke(widget, arguments);
var widgetResult = CoerceToWidgetResult(result);
return(widgetResult);
}
catch (TargetInvocationException ex)
{
var exceptionInfo = ExceptionDispatchInfo.Capture(ex.InnerException);
exceptionInfo.Throw();
return(null); // Unreachable
}
}
/// <inheritdoc />
public async Task InvokeAsync(WidgetContext context)
{
IWidgetResult result;
var asyncMethod = WidgetMethodSelector.FindAsyncMethod(context, context.WidgetDescriptor.Type.GetTypeInfo());
if (asyncMethod == null)
{
var syncMethod = WidgetMethodSelector.FindSyncMethod(context, context.WidgetDescriptor.Type.GetTypeInfo());
if (syncMethod == null)
{
throw new InvalidOperationException("Cannot find an appropriate method.");
}
result = InvokeSyncCore(syncMethod, context);
}
else
{
result = await InvokeAsyncCore(asyncMethod, context);
}
await result.ExecuteAsync(context);
}
/// <inheritdoc />
public async Task InvokeAsync(WidgetContext context)
{
IWidgetResult result;
var asyncMethod = WidgetMethodSelector.FindAsyncMethod(context, context.WidgetDescriptor.Type.GetTypeInfo());
if (asyncMethod == null)
{
var syncMethod = WidgetMethodSelector.FindSyncMethod(context, context.WidgetDescriptor.Type.GetTypeInfo());
if (syncMethod == null)
{
throw new InvalidOperationException("Cannot find an appropriate method.");
}
result = InvokeSyncCore(syncMethod, context);
}
else
{
result = await InvokeAsyncCore(asyncMethod, context);
}
await result.ExecuteAsync(context);
}
/// <inheritdoc />
public IWidgetInvoker CreateInstance(WidgetContext context)
{
return new DefaultWidgetInvoker(_typeActivatorCache, _widgetActivator, _argumentBinder);
}
/// <summary>
/// Resolves the view engine.
/// </summary>
/// <param name="context">The widget context.</param>
/// <returns>The view engine.</returns>
private static IViewEngine ResolveViewEngine(WidgetContext context)
{
return context.ViewContext.HttpContext.RequestServices.GetRequiredService<ICompositeViewEngine>();
}
/// <summary>
/// Invokes a widget synchronously.
/// </summary>
/// <param name="writer">The target text writer.</param>
/// <param name="descriptor">The widget descriptor.</param>
/// <param name="values">The set of values to provide to the widget.</param>
private void InvokeCore(TextWriter writer, WidgetDescriptor descriptor, object values = null)
{
var context = new WidgetContext(descriptor, new RouteValueDictionary(values), _viewContext, writer);
var invoker = _invokerFactory.CreateInstance(context);
invoker.Invoke(context);
}
/// <inheritdoc />
public void Execute(WidgetContext context)
{
var task = ExecuteAsync(context);
task.GetAwaiter().GetResult();
}
/// <summary>
/// Gets the arguments for the target method.
/// </summary>
/// <remarks>
/// The argument binder will provide a mixed-result of values from the provided dictionary, and those from model binding.
/// </remarks>
/// <param name="context">The widget context.</param>
/// <param name="method">The target method.</param>
/// <param name="values">The set of provided values.</param>
/// <returns>The bound arguments.</returns>
private async Task<object[]> GetArgumentsAsync(WidgetContext context, MethodInfo method, RouteValueDictionary values)
{
var arguments = await _argumentBinder.BindArgumentsAsync(context, method, values);
return arguments.Values.ToArray();
}
/// <summary>
/// Resolves the HTTP method used to discover which action to execute.
/// </summary>
/// <param name="context">The widget context.</param>
/// <returns>The HTTP method.</returns>
private static string ResolveHttpMethod(WidgetContext context)
{
string httpMethod = context.ViewContext?.HttpContext?.Request?.Method;
if (string.Equals(httpMethod, "get", StringComparison.OrdinalIgnoreCase))
{
httpMethod = "Get";
}
else
{
httpMethod = "Post";
}
if (httpMethod == "Post" && !string.IsNullOrEmpty(context.WidgetId))
{
// MA - We only want to use Post if we are the active widget.
// TODO - This needs to come from the value provider.
var form = context.ViewContext?.HttpContext?.Request?.Form;
if (!string.Equals(context.WidgetId, form[WidgetConventions.WidgetTarget], StringComparison.CurrentCultureIgnoreCase))
{
httpMethod = "Get";
}
}
return httpMethod;
}
/// <inheritdoc />
public Task ExecuteAsync(WidgetContext context)
{
Execute(context);
return Task.FromResult(true);
}
/// <summary>
/// Invokes an asynchronous method.
/// </summary>
/// <param name="method">The method to invoke.</param>
/// <param name="context">The widget context.</param>
/// <returns>The widget result.</returns>
private async Task<IWidgetResult> InvokeAsyncCore(MethodInfo method, WidgetContext context)
{
var widget = CreateWidget(context);
var arguments = await GetArgumentsAsync(context, method, context.Values);
var result = await ControllerActionExecutor.ExecuteAsync(method, widget, arguments);
var widgetResult = CoerceToWidgetResult(result);
return widgetResult;
}
/// <summary>
/// Invokes a synchronous method.
/// </summary>
/// <param name="method">The method to invoke.</param>
/// <param name="context">The widget context.</param>
/// <returns>The widget result.</returns>
private IWidgetResult InvokeSyncCore(MethodInfo method, WidgetContext context)
{
var widget = CreateWidget(context);
object result = null;
var arguments = GetArgumentsAsync(context, method, context.Values).GetAwaiter().GetResult();
try
{
result = method.Invoke(widget, arguments);
var widgetResult = CoerceToWidgetResult(result);
return widgetResult;
}
catch (TargetInvocationException ex)
{
var exceptionInfo = ExceptionDispatchInfo.Capture(ex.InnerException);
exceptionInfo.Throw();
return null; // Unreachable
}
}
/// <inheritdoc />
public void Execute(WidgetContext context)
{
context.Writer.Write(EncodedContent.ToString());
}
/// <inheritdoc />
public Task ExecuteAsync(WidgetContext context)
{
return context.Writer.WriteAsync(EncodedContent.ToString());
}
/// <inheritdoc />
public IWidgetInvoker CreateInstance(WidgetContext context)
{
return(new DefaultWidgetInvoker(_typeActivatorCache, _widgetActivator, _argumentBinder));
}
/// <summary>
/// Creates a widget instance.
/// </summary>
/// <param name="context">The widget context.</param>
/// <returns>The wiget instance.</returns>
private object CreateWidget(WidgetContext context)
{
var services = context.ViewContext.HttpContext.RequestServices;
var widget = _typeActivatorCache.CreateInstance<object>(
services,
context.WidgetDescriptor.Type);
_widgetActivator.Activate(widget, context);
return widget;
}
/// <summary>
/// Gets the arguments for the target method.
/// </summary>
/// <remarks>
/// The argument binder will provide a mixed-result of values from the provided dictionary, and those from model binding.
/// </remarks>
/// <param name="context">The widget context.</param>
/// <param name="method">The target method.</param>
/// <param name="values">The set of provided values.</param>
/// <returns>The bound arguments.</returns>
private async Task <object[]> GetArgumentsAsync(WidgetContext context, MethodInfo method, RouteValueDictionary values)
{
var arguments = await _argumentBinder.BindArgumentsAsync(context, method, values);
return(arguments.Values.ToArray());
}
