Swagger: Using NSwag instead of Swackbuckles

src/Kyoo.Abstractions/Models/Utils/RequestError.cs

@@ -0,0 +1,57 @@
+// Kyoo - A portable and vast media library solution.
+// Copyright (c) Kyoo.
+//
+// See AUTHORS.md and LICENSE file in the project root for full license information.
+//
+// Kyoo is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// Kyoo is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Kyoo. If not, see <https://www.gnu.org/licenses/>.
+
+using System;
+using System.Linq;
+using JetBrains.Annotations;
+
+namespace Kyoo.Abstractions.Models.Utils
+{
+	/// <summary>
+	/// The list of errors that where made in the request.
+	/// </summary>
+	public class RequestError
+	{
+		/// <summary>
+		/// The list of errors that where made in the request.
+		/// </summary>
+		[NotNull] public string[] Errors { get; set; }
+
+		/// <summary>
+		/// Create a new <see cref="RequestError"/> with one error.
+		/// </summary>
+		/// <param name="error">The error to specify in the response.</param>
+		public RequestError([NotNull] string error)
+		{
+			if (error == null)
+				throw new ArgumentNullException(nameof(error));
+			Errors = new[] { error };
+		}
+
+		/// <summary>
+		/// Create a new <see cref="RequestError"/> with multiple errors.
+		/// </summary>
+		/// <param name="errors">The errors to specify in the response.</param>
+		public RequestError([NotNull] string[] errors)
+		{
+			if (errors == null || !errors.Any())
+				throw new ArgumentException("Errors must be non null and not empty", nameof(errors));
+			Errors = errors;
+		}
+	}
+}

src/Kyoo.Core/CoreModule.cs

@@ -18,18 +18,21 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using Autofac;
 using Autofac.Core;
 using Autofac.Core.Registration;
 using Autofac.Extras.AttributeMetadata;
 using Kyoo.Abstractions;
 using Kyoo.Abstractions.Controllers;
+using Kyoo.Abstractions.Models.Utils;
 using Kyoo.Core.Api;
 using Kyoo.Core.Controllers;
 using Kyoo.Core.Models.Options;
 using Kyoo.Core.Tasks;
 using Kyoo.Database;
 using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.StaticFiles;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
@@ -139,8 +142,21 @@ namespace Kyoo.Core
 			string publicUrl = _configuration.GetPublicUrl();
 
 			services.AddMvcCore()
+				.AddDataAnnotations()
 				.AddControllersAsServices()
-				.AddApiExplorer();
+				.AddApiExplorer()
+				.ConfigureApiBehaviorOptions(options =>
+				{
+					options.SuppressMapClientErrors = true;
+					options.InvalidModelStateResponseFactory = ctx =>
+					{
+						string[] errors = ctx.ModelState
+							.SelectMany(x => x.Value.Errors)
+							.Select(x => x.ErrorMessage)
+							.ToArray();
+						return new BadRequestObjectResult(new RequestError(errors));
+					};
+				});
 			services.AddControllers()
 				.AddNewtonsoftJson(x =>
 				{

src/Kyoo.Core/Views/CollectionApi.cs

@@ -77,7 +77,6 @@ namespace Kyoo.Core.Api
 		/// </param>
 		/// <param name="limit">The number of shows to return.</param>
 		/// <returns>A page of shows.</returns>
-		/// <response code="200">A page of shows.</response>
 		/// <response code="400"><paramref name="sortBy"/> or <paramref name="where"/> is invalid.</response>
 		/// <response code="404">No collection with the ID <paramref name="id"/> could be found.</response>
 		[HttpGet("{id:int}/shows")]

src/Kyoo.Core/Views/Helper/CrudApi.cs

@@ -24,6 +24,8 @@ using Kyoo.Abstractions.Controllers;
 using Kyoo.Abstractions.Models;
 using Kyoo.Abstractions.Models.Exceptions;
 using Kyoo.Abstractions.Models.Permissions;
+using Kyoo.Abstractions.Models.Utils;
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 
 namespace Kyoo.Core.Api
@@ -63,15 +65,38 @@ namespace Kyoo.Core.Api
 		}
 
 		/// <summary>
-		/// Get a <typeparamref name="T"/> by ID.
+		/// Construct and return a page from an api.
 		/// </summary>
+		/// <param name="resources">The list of resources that should be included in the current page.</param>
+		/// <param name="limit">
+		/// The max number of items that should be present per page. This should be the same as in the request,
+		/// it is used to calculate if this is the last page and so on.
+		/// </param>
+		/// <typeparam name="TResult">The type of items on the page.</typeparam>
+		/// <returns>A Page representing the response.</returns>
+		protected Page<TResult> Page<TResult>(ICollection<TResult> resources, int limit)
+			where TResult : IResource
+		{
+			return new Page<TResult>(resources,
+				new Uri(BaseURL, Request.Path),
+				Request.Query.ToDictionary(x => x.Key, x => x.Value.ToString(), StringComparer.InvariantCultureIgnoreCase),
+				limit);
+		}
+
+		/// <summary>
+		/// Get by ID
+		/// </summary>
+		/// <remarks>
+		/// Get a specific resource via it's ID.
+		/// </remarks>
 		/// <param name="id">The ID of the resource to retrieve.</param>
-		/// <returns>The retrieved <typeparamref name="T"/>.</returns>
-		/// <response code="200">The <typeparamref name="T"/> exist and is returned.</response>
-		/// <response code="404">A resource with the ID <paramref name="id"/> does not exist.</response>
+		/// <returns>The retrieved resource.</returns>
+		/// <response code="404">A resource with the given ID does not exist.</response>
 		[HttpGet("{id:int}")]
 		[PartialPermission(Kind.Read)]
-		public virtual async Task<ActionResult<T>> Get(int id)
+		[ProducesResponseType(StatusCodes.Status200OK)]
+		[ProducesResponseType(StatusCodes.Status404NotFound)]
+		public async Task<ActionResult<T>> Get(int id)
 		{
 			T ret = await _repository.GetOrDefault(id);
 			if (ret == null)
@@ -79,9 +104,20 @@ namespace Kyoo.Core.Api
 			return ret;
 		}
 
+		/// <summary>
+		/// Get by slug
+		/// </summary>
+		/// <remarks>
+		/// Get a specific resource via it's slug (a unique, human readable identifier).
+		/// </remarks>
+		/// <param name="slug" example="1">The slug of the resource to retrieve.</param>
+		/// <returns>The retrieved resource.</returns>
+		/// <response code="404">A resource with the given ID does not exist.</response>
 		[HttpGet("{slug}")]
 		[PartialPermission(Kind.Read)]
-		public virtual async Task<ActionResult<T>> Get(string slug)
+		[ProducesResponseType(StatusCodes.Status200OK)]
+		[ProducesResponseType(StatusCodes.Status404NotFound)]
+		public async Task<ActionResult<T>> Get(string slug)
 		{
 			T ret = await _repository.GetOrDefault(slug);
 			if (ret == null)
@@ -89,9 +125,20 @@ namespace Kyoo.Core.Api
 			return ret;
 		}
 
+		/// <summary>
+		/// Get count
+		/// </summary>
+		/// <remarks>
+		/// Get the number of resources that match the filters.
+		/// </remarks>
+		/// <param name="where">A list of filters to respect.</param>
+		/// <returns>How many resources matched that filter.</returns>
+		/// <response code="400">Invalid filters.</response>
 		[HttpGet("count")]
 		[PartialPermission(Kind.Read)]
-		public virtual async Task<ActionResult<int>> GetCount([FromQuery] Dictionary<string, string> where)
+		[ProducesResponseType(StatusCodes.Status200OK)]
+		[ProducesResponseType(StatusCodes.Status400BadRequest, Type = typeof(RequestError))]
+		public async Task<ActionResult<int>> GetCount([FromQuery] Dictionary<string, string> where)
 		{
 			try
 			{
@@ -99,13 +146,27 @@ namespace Kyoo.Core.Api
 			}
 			catch (ArgumentException ex)
 			{
-				return BadRequest(new { Error = ex.Message });
+				return BadRequest(new RequestError(ex.Message));
 			}
 		}
 
+		/// <summary>
+		/// Get all
+		/// </summary>
+		/// <remarks>
+		/// Get all resources that match the given filter.
+		/// </remarks>
+		/// <param name="sortBy">Sort information about the query (sort by, sort order).</param>
+		/// <param name="afterID">Where the pagination should start.</param>
+		/// <param name="where">Filter the returned items.</param>
+		/// <param name="limit">How many items per page should be returned.</param>
+		/// <returns>A list of resources that match every filters.</returns>
+		/// <response code="400">Invalid filters or sort information.</response>
 		[HttpGet]
 		[PartialPermission(Kind.Read)]
-		public virtual async Task<ActionResult<Page<T>>> GetAll([FromQuery] string sortBy,
+		[ProducesResponseType(StatusCodes.Status200OK)]
+		[ProducesResponseType(StatusCodes.Status400BadRequest, Type = typeof(RequestError))]
+		public async Task<ActionResult<Page<T>>> GetAll([FromQuery] string sortBy,
 			[FromQuery] int afterID,
 			[FromQuery] Dictionary<string, string> where,
 			[FromQuery] int limit = 20)
@@ -120,21 +181,25 @@ namespace Kyoo.Core.Api
 			}
 			catch (ArgumentException ex)
 			{
-				return BadRequest(new { Error = ex.Message });
+				return BadRequest(new RequestError(ex.Message));
 			}
 		}
 
-		protected Page<TResult> Page<TResult>(ICollection<TResult> resources, int limit)
-			where TResult : IResource
-		{
-			return new Page<TResult>(resources,
-				new Uri(BaseURL, Request.Path),
-				Request.Query.ToDictionary(x => x.Key, x => x.Value.ToString(), StringComparer.InvariantCultureIgnoreCase),
-				limit);
-		}
-
+		/// <summary>
+		/// Create new
+		/// </summary>
+		/// <remarks>
+		/// Create a new item and store it. You may leave the ID unspecified, it will be filed by Kyoo.
+		/// </remarks>
+		/// <param name="resource">The resource to create.</param>
+		/// <returns>The created resource.</returns>
+		/// <response code="400">The resource in the request body is invalid.</response>
+		/// <response code="409">This item already exists (maybe a duplicated slug).</response>
 		[HttpPost]
 		[PartialPermission(Kind.Create)]
+		[ProducesResponseType(StatusCodes.Status200OK)]
+		[ProducesResponseType(StatusCodes.Status400BadRequest, Type = typeof(RequestError))]
+		[ProducesResponseType(StatusCodes.Status409Conflict, Type = typeof(ActionResult<>))]
 		public virtual async Task<ActionResult<T>> Create([FromBody] T resource)
 		{
 			try
@@ -143,7 +208,7 @@ namespace Kyoo.Core.Api
 			}
 			catch (ArgumentException ex)
 			{
-				return BadRequest(new { Error = ex.Message });
+				return BadRequest(new RequestError(ex.Message));
 			}
 			catch (DuplicatedItemException)
 			{
@@ -152,9 +217,26 @@ namespace Kyoo.Core.Api
 			}
 		}
 
+		/// <summary>
+		/// Edit
+		/// </summary>
+		/// <remarks>
+		/// Edit an item. If the ID is specified it will be used to identify the resource.
+		/// If not, the slug will be used to identify it.
+		/// </remarks>
+		/// <param name="resource">The resource to edit.</param>
+		/// <param name="resetOld">
+		/// Should old properties of the resource be discarded or should null values considered as not changed?
+		/// </param>
+		/// <returns>The created resource.</returns>
+		/// <response code="400">The resource in the request body is invalid.</response>
+		/// <response code="404">No item found with the specified ID (or slug).</response>
 		[HttpPut]
 		[PartialPermission(Kind.Write)]
-		public virtual async Task<ActionResult<T>> Edit([FromQuery] bool resetOld, [FromBody] T resource)
+		[ProducesResponseType(StatusCodes.Status200OK)]
+		[ProducesResponseType(StatusCodes.Status400BadRequest, Type = typeof(RequestError))]
+		[ProducesResponseType(StatusCodes.Status404NotFound)]
+		public async Task<ActionResult<T>> Edit([FromBody] T resource, [FromQuery] bool resetOld = true)
 		{
 			try
 			{
@@ -171,37 +253,6 @@ namespace Kyoo.Core.Api
 			}
 		}
 
-		[HttpPut("{id:int}")]
-		[PartialPermission(Kind.Write)]
-		public virtual async Task<ActionResult<T>> Edit(int id, [FromQuery] bool resetOld, [FromBody] T resource)
-		{
-			resource.ID = id;
-			try
-			{
-				return await _repository.Edit(resource, resetOld);
-			}
-			catch (ItemNotFoundException)
-			{
-				return NotFound();
-			}
-		}
-
-		[HttpPut("{slug}")]
-		[PartialPermission(Kind.Write)]
-		public virtual async Task<ActionResult<T>> Edit(string slug, [FromQuery] bool resetOld, [FromBody] T resource)
-		{
-			try
-			{
-				T old = await _repository.Get(slug);
-				resource.ID = old.ID;
-				return await _repository.Edit(resource, resetOld);
-			}
-			catch (ItemNotFoundException)
-			{
-				return NotFound();
-			}
-		}
-
 		[HttpDelete("{id:int}")]
 		[PartialPermission(Kind.Delete)]
 		public virtual async Task<IActionResult> Delete(int id)

src/Kyoo.Swagger/GenericResponseProvider.cs

@@ -0,0 +1,65 @@
+// Kyoo - A portable and vast media library solution.
+// Copyright (c) Kyoo.
+//
+// See AUTHORS.md and LICENSE file in the project root for full license information.
+//
+// Kyoo is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// Kyoo is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Kyoo. If not, see <https://www.gnu.org/licenses/>.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Kyoo.Utils;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.ApplicationModels;
+
+namespace Kyoo.Swagger
+{
+	/// <summary>
+	/// A filter that change <see cref="ProducesResponseTypeAttribute"/>'s
+	/// <see cref="ProducesResponseTypeAttribute.Type"/> that where set to <see cref="ActionResult{T}"/> to the
+	/// return type of the method.
+	/// </summary>
+	/// <remarks>
+	/// This is only useful when the return type of the method is a generics type and that can't be specified in the
+	/// attribute directly (since attributes don't support generics). This should not be used otherwise.
+	/// </remarks>
+	public class GenericResponseProvider : IApplicationModelProvider
+	{
+		/// <inheritdoc />
+		public int Order => -1;
+
+		/// <inheritdoc />
+		public void OnProvidersExecuted(ApplicationModelProviderContext context)
+		{ }
+
+		/// <inheritdoc />
+		public void OnProvidersExecuting(ApplicationModelProviderContext context)
+		{
+			foreach (ActionModel action in context.Result.Controllers.SelectMany(x => x.Actions))
+			{
+				IEnumerable<ProducesResponseTypeAttribute> responses = action.Filters
+					.OfType<ProducesResponseTypeAttribute>()
+					.Where(x => x.Type == typeof(ActionResult<>));
+				foreach (ProducesResponseTypeAttribute response in responses)
+				{
+					Type type = action.ActionMethod.ReturnType;
+					type = Utility.GetGenericDefinition(type, typeof(Task<>))?.GetGenericArguments()[0] ?? type;
+					type = Utility.GetGenericDefinition(type, typeof(ActionResult<>))?.GetGenericArguments()[0] ?? type;
+					response.Type = type;
+				}
+			}
+		}
+	}
+}

src/Kyoo.Swagger/Kyoo.Swagger.csproj

@@ -7,8 +7,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Swashbuckle.AspNetCore" Version="6.2.1" />
-		<PackageReference Include="Swashbuckle.AspNetCore.ReDoc" Version="6.2.1" />
+		<PackageReference Include="NSwag.AspNetCore" Version="13.13.2" />
 		<ProjectReference Include="../Kyoo.Abstractions/Kyoo.Abstractions.csproj" />
 	</ItemGroup>
 </Project>

src/Kyoo.Swagger/SwaggerModule.cs

@@ -18,11 +18,12 @@
 
 using System;
 using System.Collections.Generic;
-using System.IO;
 using Kyoo.Abstractions.Controllers;
 using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Mvc.ApplicationModels;
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.OpenApi.Models;
+using NSwag;
+using NSwag.Generation.AspNetCore;
 using static Kyoo.Abstractions.Models.Utils.Constants;
 
 namespace Kyoo.Swagger
@@ -47,44 +48,50 @@ namespace Kyoo.Swagger
 		/// <inheritdoc />
 		public void Configure(IServiceCollection services)
 		{
-			services.AddSwaggerGen(options =>
+			services.AddTransient<IApplicationModelProvider, GenericResponseProvider>();
+			services.AddOpenApiDocument(options =>
 			{
-				options.SwaggerDoc("v1", new OpenApiInfo
+				options.Title = "Kyoo API";
+				// TODO use a real multi-line description in markdown.
+				options.Description = "The Kyoo's public API";
+				options.Version = "1.0.0";
+				options.DocumentName = "v1";
+				options.UseControllerSummaryAsTagDescription = true;
+				options.GenerateExamples = true;
+				options.PostProcess = x =>
 				{
-					Version = "v1",
-					Title = "Kyoo API",
-					Description = "The Kyoo's public API",
-					Contact = new OpenApiContact
+					x.Info.Contact = new OpenApiContact
 					{
 						Name = "Kyoo's github",
-						Url = new Uri("https://github.com/AnonymusRaccoon/Kyoo/issues/new/choose")
-					},
-					License = new OpenApiLicense
+						Url = "https://github.com/AnonymusRaccoon/Kyoo"
+					};
+					x.Info.License = new OpenApiLicense
 					{
 						Name = "GPL-3.0-or-later",
-						Url = new Uri("https://github.com/AnonymusRaccoon/Kyoo/blob/master/LICENSE")
-					}
+						Url = "https://github.com/AnonymusRaccoon/Kyoo/blob/master/LICENSE"
+					};
+				};
+				options.AddOperationFilter(x =>
+				{
+					if (x is AspNetCoreOperationProcessorContext ctx)
+						return ctx.ApiDescription.ActionDescriptor.AttributeRouteInfo?.Order != AlternativeRoute;
+					return true;
 				});
-
-				options.LoadXmlDocumentation();
-				options.UseAllOfForInheritance();
-				options.SwaggerGeneratorOptions.SortKeySelector = x => x.RelativePath;
-				options.DocInclusionPredicate((_, apiDescription)
-					=> apiDescription.ActionDescriptor.AttributeRouteInfo?.Order != AlternativeRoute);
 			});
 		}
 
 		/// <inheritdoc />
 		public IEnumerable<IStartupAction> ConfigureSteps => new IStartupAction[]
 		{
-			SA.New<IApplicationBuilder>(app => app.UseSwagger(), SA.Before + 1),
-			SA.New<IApplicationBuilder>(app => app.UseSwaggerUI(x =>
+			SA.New<IApplicationBuilder>(app => app.UseOpenApi(), SA.Before + 1),
+			SA.New<IApplicationBuilder>(app => app.UseSwaggerUi3(x =>
 			{
-				x.SwaggerEndpoint("/swagger/v1/swagger.json", "Kyoo v1");
+				x.OperationsSorter = "alpha";
+				x.TagsSorter = "alpha";
 			}), SA.Before),
 			SA.New<IApplicationBuilder>(app => app.UseReDoc(x =>
 			{
-				x.SpecUrl = "/swagger/v1/swagger.json";
+				x.Path = "/redoc";
 			}), SA.Before)
 		};
 	}

src/Kyoo.Swagger/XmlDocumentationLoader.cs

@@ -1,68 +0,0 @@
-// Kyoo - A portable and vast media library solution.
-// Copyright (c) Kyoo.
-//
-// See AUTHORS.md and LICENSE file in the project root for full license information.
-//
-// Kyoo is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// any later version.
-//
-// Kyoo is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with Kyoo. If not, see <https://www.gnu.org/licenses/>.
-
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Xml.Linq;
-using System.Xml.XPath;
-using Microsoft.Extensions.DependencyInjection;
-using Swashbuckle.AspNetCore.SwaggerGen;
-
-namespace Kyoo.Swagger
-{
-	/// <summary>
-	/// A static class containing a custom way to include XML to Swagger.
-	/// </summary>
-	public static class XmlDocumentationLoader
-	{
-		/// <summary>
-		/// Inject human-friendly descriptions for Operations, Parameters and Schemas based on XML Comment files
-		/// </summary>
-		/// <param name="options">The swagger generator to add documentation to.</param>
-		public static void LoadXmlDocumentation(this SwaggerGenOptions options)
-		{
-			ICollection<XDocument> docs = Directory.GetFiles(AppContext.BaseDirectory, "*.xml")
-				.Select(XDocument.Load)
-				.ToList();
-			Dictionary<string, XElement> elements = docs
-				.SelectMany(x => x.XPathSelectElements("/doc/members/member[@name and not(inheritdoc)]"))
-				.ToDictionary(x => x.Attribute("name")!.Value, x => x);
-
-			foreach (XElement doc in docs
-				.SelectMany(x => x.XPathSelectElements("/doc/members/member[inheritdoc[@cref]]")))
-			{
-				if (elements.TryGetValue(doc.Attribute("cref")!.Value, out XElement member))
-					doc.Element("inheritdoc")!.ReplaceWith(member);
-			}
-			foreach (XElement doc in docs.SelectMany(x => x.XPathSelectElements("//see[@cref]")))
-			{
-				string fullName = doc.Attribute("cref")!.Value;
-				string shortName = fullName[(fullName.LastIndexOf('.') + 1)..];
-				// TODO won't work with fully qualified methods.
-				if (fullName.StartsWith("M:"))
-					shortName += "()";
-				doc.ReplaceWith(shortName);
-			}
-
-			foreach (XDocument doc in docs)
-				options.IncludeXmlComments(() => new XPathDocument(doc.CreateReader()), true);
-		}
-	}
-}