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