Retail_manager/RMDataManager/Areas/HelpPage/ModelDescriptions/ModelDescriptionGenerator.cs

451 lines
19 KiB
C#
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2022-06-30 21:37:20 +02:00
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Reflection;
using System.Runtime.Serialization;
using System.Web.Http;
using System.Web.Http.Description;
using System.Xml.Serialization;
using Newtonsoft.Json;
namespace RMDataManager.Areas.HelpPage.ModelDescriptions
{
/// <summary>
/// Generates model descriptions for given types.
/// </summary>
public class ModelDescriptionGenerator
{
// Modify this to support more data annotation attributes.
private readonly IDictionary<Type, Func<object, string>> AnnotationTextGenerator = new Dictionary<Type, Func<object, string>>
{
{ typeof(RequiredAttribute), a => "Required" },
{ typeof(RangeAttribute), a =>
{
RangeAttribute range = (RangeAttribute)a;
return String.Format(CultureInfo.CurrentCulture, "Range: inclusive between {0} and {1}", range.Minimum, range.Maximum);
}
},
{ typeof(MaxLengthAttribute), a =>
{
MaxLengthAttribute maxLength = (MaxLengthAttribute)a;
return String.Format(CultureInfo.CurrentCulture, "Max length: {0}", maxLength.Length);
}
},
{ typeof(MinLengthAttribute), a =>
{
MinLengthAttribute minLength = (MinLengthAttribute)a;
return String.Format(CultureInfo.CurrentCulture, "Min length: {0}", minLength.Length);
}
},
{ typeof(StringLengthAttribute), a =>
{
StringLengthAttribute strLength = (StringLengthAttribute)a;
return String.Format(CultureInfo.CurrentCulture, "String length: inclusive between {0} and {1}", strLength.MinimumLength, strLength.MaximumLength);
}
},
{ typeof(DataTypeAttribute), a =>
{
DataTypeAttribute dataType = (DataTypeAttribute)a;
return String.Format(CultureInfo.CurrentCulture, "Data type: {0}", dataType.CustomDataType ?? dataType.DataType.ToString());
}
},
{ typeof(RegularExpressionAttribute), a =>
{
RegularExpressionAttribute regularExpression = (RegularExpressionAttribute)a;
return String.Format(CultureInfo.CurrentCulture, "Matching regular expression pattern: {0}", regularExpression.Pattern);
}
},
};
// Modify this to add more default documentations.
private readonly IDictionary<Type, string> DefaultTypeDocumentation = new Dictionary<Type, string>
{
{ typeof(Int16), "integer" },
{ typeof(Int32), "integer" },
{ typeof(Int64), "integer" },
{ typeof(UInt16), "unsigned integer" },
{ typeof(UInt32), "unsigned integer" },
{ typeof(UInt64), "unsigned integer" },
{ typeof(Byte), "byte" },
{ typeof(Char), "character" },
{ typeof(SByte), "signed byte" },
{ typeof(Uri), "URI" },
{ typeof(Single), "decimal number" },
{ typeof(Double), "decimal number" },
{ typeof(Decimal), "decimal number" },
{ typeof(String), "string" },
{ typeof(Guid), "globally unique identifier" },
{ typeof(TimeSpan), "time interval" },
{ typeof(DateTime), "date" },
{ typeof(DateTimeOffset), "date" },
{ typeof(Boolean), "boolean" },
};
private Lazy<IModelDocumentationProvider> _documentationProvider;
public ModelDescriptionGenerator(HttpConfiguration config)
{
if (config == null)
{
throw new ArgumentNullException("config");
}
_documentationProvider = new Lazy<IModelDocumentationProvider>(() => config.Services.GetDocumentationProvider() as IModelDocumentationProvider);
GeneratedModels = new Dictionary<string, ModelDescription>(StringComparer.OrdinalIgnoreCase);
}
public Dictionary<string, ModelDescription> GeneratedModels { get; private set; }
private IModelDocumentationProvider DocumentationProvider
{
get
{
return _documentationProvider.Value;
}
}
public ModelDescription GetOrCreateModelDescription(Type modelType)
{
if (modelType == null)
{
throw new ArgumentNullException("modelType");
}
Type underlyingType = Nullable.GetUnderlyingType(modelType);
if (underlyingType != null)
{
modelType = underlyingType;
}
ModelDescription modelDescription;
string modelName = ModelNameHelper.GetModelName(modelType);
if (GeneratedModels.TryGetValue(modelName, out modelDescription))
{
if (modelType != modelDescription.ModelType)
{
throw new InvalidOperationException(
String.Format(
CultureInfo.CurrentCulture,
"A model description could not be created. Duplicate model name '{0}' was found for types '{1}' and '{2}'. " +
"Use the [ModelName] attribute to change the model name for at least one of the types so that it has a unique name.",
modelName,
modelDescription.ModelType.FullName,
modelType.FullName));
}
return modelDescription;
}
if (DefaultTypeDocumentation.ContainsKey(modelType))
{
return GenerateSimpleTypeModelDescription(modelType);
}
if (modelType.IsEnum)
{
return GenerateEnumTypeModelDescription(modelType);
}
if (modelType.IsGenericType)
{
Type[] genericArguments = modelType.GetGenericArguments();
if (genericArguments.Length == 1)
{
Type enumerableType = typeof(IEnumerable<>).MakeGenericType(genericArguments);
if (enumerableType.IsAssignableFrom(modelType))
{
return GenerateCollectionModelDescription(modelType, genericArguments[0]);
}
}
if (genericArguments.Length == 2)
{
Type dictionaryType = typeof(IDictionary<,>).MakeGenericType(genericArguments);
if (dictionaryType.IsAssignableFrom(modelType))
{
return GenerateDictionaryModelDescription(modelType, genericArguments[0], genericArguments[1]);
}
Type keyValuePairType = typeof(KeyValuePair<,>).MakeGenericType(genericArguments);
if (keyValuePairType.IsAssignableFrom(modelType))
{
return GenerateKeyValuePairModelDescription(modelType, genericArguments[0], genericArguments[1]);
}
}
}
if (modelType.IsArray)
{
Type elementType = modelType.GetElementType();
return GenerateCollectionModelDescription(modelType, elementType);
}
if (modelType == typeof(NameValueCollection))
{
return GenerateDictionaryModelDescription(modelType, typeof(string), typeof(string));
}
if (typeof(IDictionary).IsAssignableFrom(modelType))
{
return GenerateDictionaryModelDescription(modelType, typeof(object), typeof(object));
}
if (typeof(IEnumerable).IsAssignableFrom(modelType))
{
return GenerateCollectionModelDescription(modelType, typeof(object));
}
return GenerateComplexTypeModelDescription(modelType);
}
// Change this to provide different name for the member.
private static string GetMemberName(MemberInfo member, bool hasDataContractAttribute)
{
JsonPropertyAttribute jsonProperty = member.GetCustomAttribute<JsonPropertyAttribute>();
if (jsonProperty != null && !String.IsNullOrEmpty(jsonProperty.PropertyName))
{
return jsonProperty.PropertyName;
}
if (hasDataContractAttribute)
{
DataMemberAttribute dataMember = member.GetCustomAttribute<DataMemberAttribute>();
if (dataMember != null && !String.IsNullOrEmpty(dataMember.Name))
{
return dataMember.Name;
}
}
return member.Name;
}
private static bool ShouldDisplayMember(MemberInfo member, bool hasDataContractAttribute)
{
JsonIgnoreAttribute jsonIgnore = member.GetCustomAttribute<JsonIgnoreAttribute>();
XmlIgnoreAttribute xmlIgnore = member.GetCustomAttribute<XmlIgnoreAttribute>();
IgnoreDataMemberAttribute ignoreDataMember = member.GetCustomAttribute<IgnoreDataMemberAttribute>();
NonSerializedAttribute nonSerialized = member.GetCustomAttribute<NonSerializedAttribute>();
ApiExplorerSettingsAttribute apiExplorerSetting = member.GetCustomAttribute<ApiExplorerSettingsAttribute>();
bool hasMemberAttribute = member.DeclaringType.IsEnum ?
member.GetCustomAttribute<EnumMemberAttribute>() != null :
member.GetCustomAttribute<DataMemberAttribute>() != null;
// Display member only if all the followings are true:
// no JsonIgnoreAttribute
// no XmlIgnoreAttribute
// no IgnoreDataMemberAttribute
// no NonSerializedAttribute
// no ApiExplorerSettingsAttribute with IgnoreApi set to true
// no DataContractAttribute without DataMemberAttribute or EnumMemberAttribute
return jsonIgnore == null &&
xmlIgnore == null &&
ignoreDataMember == null &&
nonSerialized == null &&
(apiExplorerSetting == null || !apiExplorerSetting.IgnoreApi) &&
(!hasDataContractAttribute || hasMemberAttribute);
}
private string CreateDefaultDocumentation(Type type)
{
string documentation;
if (DefaultTypeDocumentation.TryGetValue(type, out documentation))
{
return documentation;
}
if (DocumentationProvider != null)
{
documentation = DocumentationProvider.GetDocumentation(type);
}
return documentation;
}
private void GenerateAnnotations(MemberInfo property, ParameterDescription propertyModel)
{
List<ParameterAnnotation> annotations = new List<ParameterAnnotation>();
IEnumerable<Attribute> attributes = property.GetCustomAttributes();
foreach (Attribute attribute in attributes)
{
Func<object, string> textGenerator;
if (AnnotationTextGenerator.TryGetValue(attribute.GetType(), out textGenerator))
{
annotations.Add(
new ParameterAnnotation
{
AnnotationAttribute = attribute,
Documentation = textGenerator(attribute)
});
}
}
// Rearrange the annotations
annotations.Sort((x, y) =>
{
// Special-case RequiredAttribute so that it shows up on top
if (x.AnnotationAttribute is RequiredAttribute)
{
return -1;
}
if (y.AnnotationAttribute is RequiredAttribute)
{
return 1;
}
// Sort the rest based on alphabetic order of the documentation
return String.Compare(x.Documentation, y.Documentation, StringComparison.OrdinalIgnoreCase);
});
foreach (ParameterAnnotation annotation in annotations)
{
propertyModel.Annotations.Add(annotation);
}
}
private CollectionModelDescription GenerateCollectionModelDescription(Type modelType, Type elementType)
{
ModelDescription collectionModelDescription = GetOrCreateModelDescription(elementType);
if (collectionModelDescription != null)
{
return new CollectionModelDescription
{
Name = ModelNameHelper.GetModelName(modelType),
ModelType = modelType,
ElementDescription = collectionModelDescription
};
}
return null;
}
private ModelDescription GenerateComplexTypeModelDescription(Type modelType)
{
ComplexTypeModelDescription complexModelDescription = new ComplexTypeModelDescription
{
Name = ModelNameHelper.GetModelName(modelType),
ModelType = modelType,
Documentation = CreateDefaultDocumentation(modelType)
};
GeneratedModels.Add(complexModelDescription.Name, complexModelDescription);
bool hasDataContractAttribute = modelType.GetCustomAttribute<DataContractAttribute>() != null;
PropertyInfo[] properties = modelType.GetProperties(BindingFlags.Public | BindingFlags.Instance);
foreach (PropertyInfo property in properties)
{
if (ShouldDisplayMember(property, hasDataContractAttribute))
{
ParameterDescription propertyModel = new ParameterDescription
{
Name = GetMemberName(property, hasDataContractAttribute)
};
if (DocumentationProvider != null)
{
propertyModel.Documentation = DocumentationProvider.GetDocumentation(property);
}
GenerateAnnotations(property, propertyModel);
complexModelDescription.Properties.Add(propertyModel);
propertyModel.TypeDescription = GetOrCreateModelDescription(property.PropertyType);
}
}
FieldInfo[] fields = modelType.GetFields(BindingFlags.Public | BindingFlags.Instance);
foreach (FieldInfo field in fields)
{
if (ShouldDisplayMember(field, hasDataContractAttribute))
{
ParameterDescription propertyModel = new ParameterDescription
{
Name = GetMemberName(field, hasDataContractAttribute)
};
if (DocumentationProvider != null)
{
propertyModel.Documentation = DocumentationProvider.GetDocumentation(field);
}
complexModelDescription.Properties.Add(propertyModel);
propertyModel.TypeDescription = GetOrCreateModelDescription(field.FieldType);
}
}
return complexModelDescription;
}
private DictionaryModelDescription GenerateDictionaryModelDescription(Type modelType, Type keyType, Type valueType)
{
ModelDescription keyModelDescription = GetOrCreateModelDescription(keyType);
ModelDescription valueModelDescription = GetOrCreateModelDescription(valueType);
return new DictionaryModelDescription
{
Name = ModelNameHelper.GetModelName(modelType),
ModelType = modelType,
KeyModelDescription = keyModelDescription,
ValueModelDescription = valueModelDescription
};
}
private EnumTypeModelDescription GenerateEnumTypeModelDescription(Type modelType)
{
EnumTypeModelDescription enumDescription = new EnumTypeModelDescription
{
Name = ModelNameHelper.GetModelName(modelType),
ModelType = modelType,
Documentation = CreateDefaultDocumentation(modelType)
};
bool hasDataContractAttribute = modelType.GetCustomAttribute<DataContractAttribute>() != null;
foreach (FieldInfo field in modelType.GetFields(BindingFlags.Public | BindingFlags.Static))
{
if (ShouldDisplayMember(field, hasDataContractAttribute))
{
EnumValueDescription enumValue = new EnumValueDescription
{
Name = field.Name,
Value = field.GetRawConstantValue().ToString()
};
if (DocumentationProvider != null)
{
enumValue.Documentation = DocumentationProvider.GetDocumentation(field);
}
enumDescription.Values.Add(enumValue);
}
}
GeneratedModels.Add(enumDescription.Name, enumDescription);
return enumDescription;
}
private KeyValuePairModelDescription GenerateKeyValuePairModelDescription(Type modelType, Type keyType, Type valueType)
{
ModelDescription keyModelDescription = GetOrCreateModelDescription(keyType);
ModelDescription valueModelDescription = GetOrCreateModelDescription(valueType);
return new KeyValuePairModelDescription
{
Name = ModelNameHelper.GetModelName(modelType),
ModelType = modelType,
KeyModelDescription = keyModelDescription,
ValueModelDescription = valueModelDescription
};
}
private ModelDescription GenerateSimpleTypeModelDescription(Type modelType)
{
SimpleTypeModelDescription simpleModelDescription = new SimpleTypeModelDescription
{
Name = ModelNameHelper.GetModelName(modelType),
ModelType = modelType,
Documentation = CreateDefaultDocumentation(modelType)
};
GeneratedModels.Add(simpleModelDescription.Name, simpleModelDescription);
return simpleModelDescription;
}
}
}