private async Task <Type> CompileResultTypeAsync(DynamicDtoTypeBuildingContext context)
{
var proxyClassName = GetProxyTypeName(context.ModelType, "Proxy");
var tb = GetTypeBuilder(context.ModelType, proxyClassName, new List <Type> {
typeof(IDynamicDtoProxy)
});
var constructor = tb.DefineDefaultConstructor(MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName);
using (context.OpenNamePrefix(proxyClassName))
{
var properties = await GetDynamicPropertiesAsync(context.ModelType, context);
foreach (var property in properties)
{
if (context.PropertyFilter == null || context.PropertyFilter.Invoke(property.PropertyName))
{
CreateProperty(tb, property.PropertyName, property.PropertyType);
}
}
var objectType = tb.CreateType();
context.ClassCreated(objectType);
return(objectType);
}
}
private string GetTypeCacheKey(Type type, DynamicDtoTypeBuildingContext context)
{
var entityType = DynamicDtoExtensions.GetDynamicDtoEntityType(type);
if (entityType == null)
{
throw new NotSupportedException($"Type '{type.FullName}' is not a dynamic DTO");
}
return($"{entityType.FullName}|formFields:{context.AddFormFieldsProperty.ToString().ToLower()}|useEntityDtos:{context.UseDtoForEntityReferences.ToString().ToLower()}");
}
private async Task <Type> CompileResultTypeAsync(Type baseType,
string proxyClassName,
List <Type> interfaces,
List <DynamicProperty> properties,
DynamicDtoTypeBuildingContext context)
{
var tb = GetTypeBuilder(baseType, proxyClassName, interfaces.Union(new List <Type> {
typeof(IDynamicDtoProxy)
}));
var constructor = tb.DefineDefaultConstructor(MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName);
foreach (var property in properties)
{
CreateProperty(tb, property.PropertyName, property.PropertyType);
}
var objectType = tb.CreateType();
context.ClassCreated(objectType);
return(objectType);
}
private Type GetEntityReferenceType(EntityPropertyDto propertyDto, DynamicDtoTypeBuildingContext context)
{
if (propertyDto.DataType != DataTypes.EntityReference)
{
throw new NotSupportedException($"DataType {propertyDto.DataType} is not supported. Expected {DataTypes.EntityReference}");
}
if (string.IsNullOrWhiteSpace(propertyDto.EntityType))
{
return(null);
}
var entityConfig = _entityConfigurationStore.Get(propertyDto.EntityType);
if (entityConfig == null)
{
return(null);
}
return(context.UseDtoForEntityReferences
? typeof(EntityWithDisplayNameDto <>).MakeGenericType(entityConfig.IdType)
: entityConfig?.IdType);
}
public async Task <Type> BuildDtoFullProxyTypeAsync(Type baseType, DynamicDtoTypeBuildingContext context)
{
var cacheKey = GetTypeCacheKey(baseType, context);
var cachedDtoItem = await FullProxyCache.GetOrDefaultAsync(cacheKey);
if (cachedDtoItem != null)
{
context.Classes = cachedDtoItem.NestedClasses.ToDictionary(i => i.Key, i => i.Value);
return(cachedDtoItem.DtoType);
}
var proxyClassName = GetProxyTypeName(baseType, "FullProxy");
var properties = await GetDynamicPropertiesAsync(baseType, context);
if (context.AddFormFieldsProperty && !properties.Any(p => p.PropertyName == nameof(IHasFormFieldsList._formFields)))
{
properties.Add(new DynamicProperty {
PropertyName = nameof(IHasFormFieldsList._formFields), PropertyType = typeof(List <string>)
});
}
var interfaces = new List <Type>();
if (context.AddFormFieldsProperty)
{
interfaces.Add(typeof(IHasFormFieldsList));
}
var type = await CompileResultTypeAsync(baseType, proxyClassName, interfaces, properties, context);
await FullProxyCache.SetAsync(cacheKey, new DynamicDtoProxyCacheItem {
DtoType = type,
NestedClasses = context.Classes.ToDictionary(i => i.Key, i => i.Value)
});
return(type);
}
public async Task <List <DynamicProperty> > GetDynamicPropertiesAsync(Type type, DynamicDtoTypeBuildingContext context)
{
var entityType = DynamicDtoExtensions.GetDynamicDtoEntityType(type);
if (entityType == null)
{
throw new Exception("Failed to extract entity type of the dynamic DTO");
}
var properties = new DynamicPropertyList();
var hardCodedDtoProperties = type.GetProperties().Select(p => p.Name.ToLower()).ToList();
var configuredProperties = await GetEntityPropertiesAsync(entityType);
foreach (var property in configuredProperties)
{
// skip property if already included into the DTO (hardcoded)
if (hardCodedDtoProperties.Contains(property.Name.ToLower()))
{
continue;
}
if (string.IsNullOrWhiteSpace(property.DataType))
{
Logger.Warn($"Type '{type.FullName}': {nameof(property.DataType)} of property {property.Name} is empty");
continue;
}
var propertyType = await GetDtoPropertyTypeAsync(property, context);
if (propertyType != null)
{
properties.Add(property.Name, propertyType);
}
}
// internal fields
if (context.AddFormFieldsProperty)
{
properties.Add(nameof(IHasFormFieldsList._formFields), typeof(List <string>));
}
return(properties);
}
/// inheritedDoc
public async Task <Type> BuildDtoProxyTypeAsync(DynamicDtoTypeBuildingContext context)
{
return(await CompileResultTypeAsync(context));
}
private async Task <Type> BuildNestedTypeAsync(EntityPropertyDto propertyDto, DynamicDtoTypeBuildingContext context)
{
if (propertyDto.DataType != DataTypes.Object)
{
throw new NotSupportedException($"{nameof(BuildNestedTypeAsync)}: unsupported type of property (expected '{DataTypes.Object}', actual: '{propertyDto.DataType}')");
}
// todo: build name of the class according ot the level of the property
using (context.OpenNamePrefix(propertyDto.Name))
{
var className = context.CurrentPrefix.Replace('.', '_');
var tb = GetTypeBuilder(typeof(object), className, new List <Type> {
typeof(IDynamicNestedObject)
});
var constructor = tb.DefineDefaultConstructor(MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName);
foreach (var property in propertyDto.Properties)
{
//if (propertyFilter == null || propertyFilter.Invoke(property.PropertyName))
var propertyType = await GetDtoPropertyTypeAsync(property, context);
CreateProperty(tb, property.Name, propertyType);
}
var objectType = tb.CreateType();
context.ClassCreated(objectType);
return(objectType);
}
}
/// <summary>
/// Returns .Net type that is used to store data for the specified DTO property (according to the property settings)
/// </summary>
public async Task <Type> GetDtoPropertyTypeAsync(EntityPropertyDto propertyDto, DynamicDtoTypeBuildingContext context)
{
var dataType = propertyDto.DataType;
var dataFormat = propertyDto.DataFormat;
switch (dataType)
{
case DataTypes.Guid:
return(typeof(Guid?));
case DataTypes.String:
return(typeof(string));
case DataTypes.Date:
case DataTypes.DateTime:
return(typeof(DateTime?));
case DataTypes.Time:
return(typeof(TimeSpan?));
case DataTypes.Boolean:
return(typeof(bool?));
case DataTypes.ReferenceListItem:
// todo: find a way to check an entity property
// if it's declared as an enum - get base type of this enum
// if it's declared as int/Int64 - use this type
return(typeof(Int64?));
case DataTypes.Number:
{
switch (dataFormat)
{
case NumberFormats.Int32:
return(typeof(int?));
case NumberFormats.Int64:
return(typeof(Int64?));
case NumberFormats.Float:
return(typeof(float?));
case NumberFormats.Double:
return(typeof(decimal?));
default:
return(typeof(decimal?));
}
}
case DataTypes.EntityReference:
return(GetEntityReferenceType(propertyDto, context));
case DataTypes.Array:
{
if (propertyDto.ItemsType == null)
{
return(null);
}
var nestedType = await GetDtoPropertyTypeAsync(propertyDto.ItemsType, context);
var arrayType = typeof(List <>).MakeGenericType(nestedType);
return(arrayType);
}
case DataTypes.Object:
return(await BuildNestedTypeAsync(propertyDto, context)); // JSON content
default:
throw new NotSupportedException($"Data type not supported: {dataType}");
}
}
/// <inheritdoc />
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
_logger.AttemptingToBindModel(bindingContext);
// Special logic for body, treat the model name as string.Empty for the top level
// object, but allow an override via BinderModelName. The purpose of this is to try
// and be similar to the behavior for POCOs bound via traditional model binding.
string modelBindingKey;
if (bindingContext.IsTopLevelObject)
{
modelBindingKey = bindingContext.BinderModelName ?? string.Empty;
}
else
{
modelBindingKey = bindingContext.ModelName;
}
var httpContext = bindingContext.HttpContext;
httpContext.Request.EnableBuffering(); // enable buffering to read body twice
#region
// check if type is already proxied
var modelType = bindingContext.ModelType;
var metadata = bindingContext.ModelMetadata;
if (modelType is IDynamicDtoProxy)
{
throw new NotSupportedException($"{this.GetType().FullName} doesn't support binding of the dynamic poxies. Type `{modelType.FullName}` is implementing `{nameof(IDynamicDtoProxy)}` interface");
}
var defaultMetadata = bindingContext.ModelMetadata as DefaultModelMetadata;
var bindingSettings = defaultMetadata != null
? defaultMetadata.Attributes.ParameterAttributes?.OfType <IDynamicMappingSettings>().FirstOrDefault()
: null;
bindingSettings = bindingSettings ?? new DynamicMappingSettings();
var fullDtoBuildContext = new DynamicDtoTypeBuildingContext
{
ModelType = bindingContext.ModelType,
PropertyFilter = propName => true,
AddFormFieldsProperty = true,
UseDtoForEntityReferences = bindingSettings.UseDtoForEntityReferences,
};
modelType = await _dtoBuilder.BuildDtoFullProxyTypeAsync(bindingContext.ModelType, fullDtoBuildContext);
metadata = bindingContext.ModelMetadata.GetMetadataForType(modelType);
#endregion
var formatterContext = new InputFormatterContext(
httpContext,
modelBindingKey,
bindingContext.ModelState,
metadata,
_readerFactory,
AllowEmptyBody);
var formatter = (IInputFormatter?)null;
for (var i = 0; i < _formatters.Count; i++)
{
if (_formatters[i].CanRead(formatterContext))
{
formatter = _formatters[i];
_logger.InputFormatterSelected(formatter, formatterContext);
break;
}
else
{
_logger.InputFormatterRejected(_formatters[i], formatterContext);
}
}
if (formatter == null)
{
if (AllowEmptyBody)
{
var hasBody = httpContext.Features.Get <IHttpRequestBodyDetectionFeature>()?.CanHaveBody;
hasBody ??= httpContext.Request.ContentLength is not null && httpContext.Request.ContentLength == 0;
if (hasBody == false)
{
bindingContext.Result = ModelBindingResult.Success(model: null);
return;
}
}
_logger.NoInputFormatterSelected(formatterContext);
var message = $"Unsupported content type '{httpContext.Request.ContentType}'.";
var exception = new UnsupportedContentTypeException(message);
bindingContext.ModelState.AddModelError(modelBindingKey, exception, bindingContext.ModelMetadata);
_logger.DoneAttemptingToBindModel(bindingContext);
return;
}
try
{
var body = await GetRequestBodyAsync(httpContext); // read body (will be used on later stage)
var result = await formatter.ReadAsync(formatterContext);
if (result.HasError)
{
// Formatter encountered an error. Do not use the model it returned.
_logger.DoneAttemptingToBindModel(bindingContext);
return;
}
if (result.IsModelSet)
{
if (result.Model is IHasFormFieldsList modelWithFormFields)
{
// if _formFields is missing in the request - build it automatically according to the json request
if (modelWithFormFields._formFields == null)
{
modelWithFormFields._formFields = GetFormFieldsFromBody(body);
}
var bindKeys = GetAllPropertyKeys(modelWithFormFields._formFields);
var buildContext = new DynamicDtoTypeBuildingContext {
ModelType = bindingContext.ModelType,
PropertyFilter = propName => {
return(bindKeys.Contains(propName.ToLower()));
},
AddFormFieldsProperty = true,
};
var effectiveModelType = await _dtoBuilder.BuildDtoProxyTypeAsync(buildContext);
var mapper = GetMapper(result.Model.GetType(), effectiveModelType, fullDtoBuildContext.Classes);
var effectiveModel = mapper.Map(result.Model, result.Model.GetType(), effectiveModelType);
bindingContext.Result = ModelBindingResult.Success(effectiveModel);
}
else
{
bindingContext.Result = ModelBindingResult.Success(result.Model);
}
}
else
{
// If the input formatter gives a "no value" result, that's always a model state error,
// because BodyModelBinder implicitly regards input as being required for model binding.
// If instead the input formatter wants to treat the input as optional, it must do so by
// returning InputFormatterResult.Success(defaultForModelType), because input formatters
// are responsible for choosing a default value for the model type.
var message = bindingContext
.ModelMetadata
.ModelBindingMessageProvider
.MissingRequestBodyRequiredValueAccessor();
bindingContext.ModelState.AddModelError(modelBindingKey, message);
}
}
catch (Exception exception) when(exception is InputFormatterException || ShouldHandleException(formatter))
{
bindingContext.ModelState.AddModelError(modelBindingKey, exception, bindingContext.ModelMetadata);
}
_logger.DoneAttemptingToBindModel(bindingContext);
}
