Aspnet support (prerelease)

.editorconfig

@@ -0,0 +1,4 @@
+[*.{cs,vb}]
+
+# IDE0037: Use inferred member name
+dotnet_diagnostic.IDE0037.severity = silent

.gitignore

@@ -397,4 +397,5 @@ FodyWeavers.xsd
 
 # JetBrains Rider
 *.sln.iml
-/Graeae.Models/OpenApi.Models.xml
+*.xml
+

Graeae.AspNet.Analyzer/AdditionalOperationsAnalyzer.cs

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+using System;
+using System.Collections.Immutable;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using Graeae.Models;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Yaml2JsonNode;
+
+namespace Graeae.AspNet.Analyzer;
+
+/// <summary>
+/// Outputs diagnostics for handlers that handle routes or operations that are not listed in the OAI description.
+/// </summary>
+[Generator(LanguageNames.CSharp)]
+internal class AdditionalOperationsAnalyzer : IIncrementalGenerator
+{
+	private static OpenApiDocument[]? OpenApiDocs { get; set; }
+
+	public void Initialize(IncrementalGeneratorInitializationContext context)
+	{
+		OpenApiDocs = null;
+
+		var handlerClasses = context.SyntaxProvider.CreateSyntaxProvider(HandlerClassPredicate, HandlerClassTransform)
+			.Where(x => x is not null);
+
+		var files = context.AdditionalTextsProvider.Where(static file => file.Path.EndsWith("openapi.yaml"));
+		var namesAndContents = files.Select((f, ct) => (Name: Path.GetFileNameWithoutExtension(f.Path), Content: f.GetText(ct)?.ToString(), Path: f.Path));
+
+		context.RegisterSourceOutput(handlerClasses.Combine(namesAndContents.Collect()), AddDiagnostics);
+	}
+
+	private static bool HandlerClassPredicate(SyntaxNode node, CancellationToken token)
+	{
+		return node is ClassDeclarationSyntax { AttributeLists.Count: > 0 };
+	}
+
+	private static (string, ClassDeclarationSyntax)? HandlerClassTransform(GeneratorSyntaxContext context, CancellationToken token)
+	{
+		var classDeclaration = (ClassDeclarationSyntax)context.Node;
+		var symbol = context.SemanticModel.GetDeclaredSymbol(context.Node);
+
+		if (symbol is INamedTypeSymbol &&
+		    classDeclaration.TryGetAttribute("Graeae.AspNet.RequestHandlerAttribute", context.SemanticModel, token, out var attribute) &&
+		    attribute!.TryGetStringParameter(out var route))
+		{
+			return (route!, classDeclaration);
+		}
+
+		return null;
+	}
+
+	private static void AddDiagnostics(SourceProductionContext context, ((string Route, ClassDeclarationSyntax Type)? Handler, ImmutableArray<(string Name, string? Content, string Path)> Files) source)
+	{
+		try
+		{
+			OpenApiDocs ??= source.Files.Select(file =>
+			{
+				if (file.Content == null)
+					throw new Exception("Failed to read file \"" + file.Path + "\"");
+				var doc = YamlSerializer.Deserialize<OpenApiDocument>(file.Content);
+				doc!.Initialize().Wait();
+
+				return doc;
+			}).ToArray();
+
+			var handler = source.Handler!.Value;
+
+			var allPaths = OpenApiDocs.SelectMany(x => x.Paths).ToList();
+			var path = allPaths.FirstOrDefault(x => x.Key.ToString() == handler.Route);
+			if (path.Key is null)
+			{
+				context.ReportDiagnostic(Diagnostics.AdditionalRouteHandler(handler.Route));
+				return;
+			}
+
+			var route = path.Key;
+			var pathItem = path.Value;
+
+			var methods = handler.Type.Members.OfType<MethodDeclarationSyntax>().ToArray();
+
+			foreach (var method in methods)
+			{
+				var (op, name) = GetMatchingOperation(method, pathItem);
+				if (!OperationExists(route, op, method))
+					context.ReportDiagnostic(Diagnostics.AdditionalRouteOperationHandler(route.ToString(), name!));
+			}
+		}
+		catch (Exception e)
+		{
+			//Debug.Break();
+			var errorMessage = $"Error: {e.Message}\n\nStack trace: {e.StackTrace}\n\nStack trace: {e.InnerException?.StackTrace}";
+			context.ReportDiagnostic(Diagnostics.OperationalError(errorMessage));
+		}
+	}
+
+	private static (Operation? Op, string? Name) GetMatchingOperation(MethodDeclarationSyntax method, PathItem pathItem) =>
+		method.Identifier.ValueText.ToUpperInvariant() switch
+		{
+			"GET" => (pathItem.Get, nameof(pathItem.Get)),
+			"POST" => (pathItem.Post, nameof(pathItem.Post)),
+			"PUT" => (pathItem.Put, nameof(pathItem.Put)),
+			"DELETE" => (pathItem.Delete, nameof(pathItem.Delete)),
+			"TRACE" => (pathItem.Trace, nameof(pathItem.Trace)),
+			"OPTIONS" => (pathItem.Options, nameof(pathItem.Options)),
+			"HEAD" => (pathItem.Head, nameof(pathItem.Head)),
+			_ => (null, null)
+		};
+
+	private static bool OperationExists(PathTemplate route, Operation? op, MethodDeclarationSyntax method)
+	{
+		if (op is null) return false;
+
+		// parameters can be implicitly or explicitly bound
+		//
+		// - path
+		//   - implicitly bound by name
+		//   - explicitly bound with [FromRoute(Name = "name")]
+		// - query
+		//   - implicitly bound by name
+		//   - explicitly bound with [FromQuery(Name = "name")]
+		// - header
+		//   - explicitly bound with [FromHeader(Name = "name")]
+		// - body
+		//   - implicitly bound by model
+
+		var implicitOpenApiParameters = route.Segments.Select(x =>
+		{
+			var match = PathHelpers.TemplatedSegmentPattern.Match(x);
+			return match.Success
+				? new Parameter(match.Groups["param"].Value, ParameterLocation.Path)
+				: null;
+		}).Where(x => x is not null);
+		if (op.RequestBody is not null) 
+			implicitOpenApiParameters = implicitOpenApiParameters.Append(Parameter.Body);
+		var explicitOpenapiParameters = op.Parameters?.Select(x => new Parameter(x.Name, x.In)) ?? [];
+		var openApiParameters = implicitOpenApiParameters.Union(explicitOpenapiParameters).ToArray();
+		var methodParameterList = method.ParameterList.Parameters.SelectMany(AnalysisExtensions.GetParameters);
+
+		return openApiParameters.All(x => methodParameterList.Contains(x));
+	}
+}

Graeae.AspNet.Analyzer/AnalysisExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Threading;
+using Graeae.Models;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+namespace Graeae.AspNet.Analyzer;
+
+internal static class AnalysisExtensions
+{
+	public static bool TryGetAttribute(this ClassDeclarationSyntax candidate, string attributeName, SemanticModel semanticModel, CancellationToken cancellationToken, out AttributeSyntax? value)
+	{
+		foreach (var attributeList in candidate.AttributeLists)
+		{
+			foreach (var attribute in attributeList.Attributes)
+			{
+				var info = semanticModel.GetSymbolInfo(attribute, cancellationToken);
+				var symbol = info.Symbol;
+
+				if (symbol is IMethodSymbol method
+				    && method.ContainingType.ToDisplayString().Equals(attributeName, StringComparison.Ordinal))
+				{
+					value = attribute;
+					return true;
+				}
+			}
+		}
+
+		value = null;
+		return false;
+	}
+
+	public static bool TryGetStringParameter(this AttributeSyntax attribute, out string? value)
+	{
+		if (attribute.ArgumentList is
+		    {
+			    Arguments.Count: 1,
+		    } argumentList)
+		{
+			var argument = argumentList.Arguments[0];
+
+			if (argument.Expression is LiteralExpressionSyntax literal)
+			{
+				value = literal.Token.Value?.ToString();
+				return true;
+			}
+		}
+
+		value = null;
+		return false;
+	}
+
+	public static IEnumerable<Parameter> GetParameters(this ParameterSyntax parameter)
+	{
+		if (TryGetAttribute(parameter.AttributeLists, "FromRoute", out var attribute) &&
+		    TryGetStringParameter(attribute!, out var name))
+			yield return new Parameter(name!, ParameterLocation.Path);
+		else if (TryGetAttribute(parameter.AttributeLists, "FromQuery", out attribute) &&
+		         TryGetStringParameter(attribute!, out name))
+			yield return new Parameter(name!, ParameterLocation.Query);
+		else if (TryGetAttribute(parameter.AttributeLists, "FromHeader", out attribute) &&
+		         TryGetStringParameter(attribute!, out name))
+			yield return new Parameter(name!, ParameterLocation.Header);
+		else if (TryGetAttribute(parameter.AttributeLists, "FromBody", out _))
+			yield return Parameter.Body;
+		else if (TryGetAttribute(parameter.AttributeLists, "FromServices", out _))
+		{
+		}
+		else
+		{
+			// if no attributes are found then consider all implicit options
+			yield return new Parameter(parameter.Identifier.ValueText, ParameterLocation.Path);
+			yield return new Parameter(parameter.Identifier.ValueText, ParameterLocation.Query);
+			// TODO: this is catching services and the http context
+			//yield return Parameter.Body;
+		}
+	}
+
+	private static bool TryGetAttribute(SyntaxList<AttributeListSyntax> attributeLists, string attributeName, out AttributeSyntax? attribute)
+	{
+		foreach (var attributeList in attributeLists)
+		{
+			foreach (var att in attributeList.Attributes)
+			{
+				if (att.Name.ToString() == attributeName)
+				{
+					attribute = att;
+					return true;
+				}
+			}
+		}
+
+		attribute = null;
+		return false;
+	}
+
+	/// <summary>
+	/// determine the namespace the class/enum/struct is declared in, if any
+	/// </summary>
+	public static string GetNamespace(this BaseTypeDeclarationSyntax syntax)
+	{
+		// If we don't have a namespace at all we'll return an empty string
+		// This accounts for the "default namespace" case
+		string nameSpace = string.Empty;
+
+		// Get the containing syntax node for the type declaration
+		// (could be a nested type, for example)
+		SyntaxNode? potentialNamespaceParent = syntax.Parent;
+
+		// Keep moving "out" of nested classes etc until we get to a namespace
+		// or until we run out of parents
+		while (potentialNamespaceParent != null &&
+		       potentialNamespaceParent is not NamespaceDeclarationSyntax
+		       && potentialNamespaceParent is not FileScopedNamespaceDeclarationSyntax)
+		{
+			potentialNamespaceParent = potentialNamespaceParent.Parent;
+		}
+
+		// Build up the final namespace by looping until we no longer have a namespace declaration
+		if (potentialNamespaceParent is BaseNamespaceDeclarationSyntax namespaceParent)
+		{
+			// We have a namespace. Use that as the type
+			nameSpace = namespaceParent.Name.ToString();
+
+			// Keep moving "out" of the namespace declarations until we 
+			// run out of nested namespace declarations
+			while (true)
+			{
+				if (namespaceParent.Parent is not NamespaceDeclarationSyntax parent)
+				{
+					break;
+				}
+
+				// Add the outer namespace as a prefix to the final namespace
+				nameSpace = $"{namespaceParent.Name}.{nameSpace}";
+				namespaceParent = parent;
+			}
+		}
+
+		// return the final namespace
+		return nameSpace;
+	}
+}

Graeae.AspNet.Analyzer/Debug.cs

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+using System.Diagnostics;
+
+namespace Graeae.AspNet.Analyzer;
+
+internal static class Debug
+{
+	[Conditional("DEBUG")]
+	public static void Inject()
+	{
+		if (!Debugger.IsAttached) Debugger.Launch();
+	}
+}

Graeae.AspNet.Analyzer/Diagnostics.cs

@@ -0,0 +1,30 @@
+using Microsoft.CodeAnalysis;
+
+namespace Graeae.AspNet.Analyzer;
+
+internal static class Diagnostics
+{
+	public static Diagnostic OperationalError(string message) =>
+		Diagnostic.Create(new("GR0001", "Operational error", message, "Operation", DiagnosticSeverity.Error, true), Location.None, DiagnosticSeverity.Error);
+
+	public static Diagnostic NoPaths(string openApiFilePath) =>
+		Diagnostic.Create(new("GR0002", "No paths", $"No paths are defined in '{openApiFilePath}'", "Path coverage", DiagnosticSeverity.Info, true), Location.None, DiagnosticSeverity.Info);
+
+	public static Diagnostic MissingRouteHandler(string route) =>
+		Diagnostic.Create(new("GR0003", "Route not handled", $"Found no handler type for route '{route}'", "Path coverage", DiagnosticSeverity.Warning, true), Location.None, DiagnosticSeverity.Warning);
+
+	public static Diagnostic MissingRouteOperationHandler(string route, string op) =>
+		Diagnostic.Create(new("GR0004", "Route not handled", $"Found no handler for '{op.ToUpperInvariant()} {route}'", "Path coverage", DiagnosticSeverity.Warning, true), Location.None, DiagnosticSeverity.Warning);
+
+	public static Diagnostic AdditionalRouteHandler(string route) =>
+		Diagnostic.Create(new("GR0005", "Route not published", $"Found handler type for route '{route}' but it does not appear in the OpenAPI definition", "Path coverage", DiagnosticSeverity.Warning, true), Location.None, DiagnosticSeverity.Warning);
+
+	public static Diagnostic AdditionalRouteOperationHandler(string route, string op) =>
+		Diagnostic.Create(new("GR0006", "Route not published", $"Found handler for '{op.ToUpperInvariant()} {route}' but it does not appear in the OpenAPI definition", "Path coverage", DiagnosticSeverity.Warning, true), Location.None, DiagnosticSeverity.Warning);
+
+	public static Diagnostic ExternalFileAdded(string filePath) =>
+		Diagnostic.Create(new("GR0007", "Document load success", $"File {filePath} added to document resolver", "OpenAPI docs", DiagnosticSeverity.Info, true), null, filePath);
+
+	public static Diagnostic ExternalFileNotAdded(string filePath) =>
+		Diagnostic.Create(new DiagnosticDescriptor("GR0008", "Document load failure", $"File {filePath} could not be added to document resolver", "OpenAPI docs", DiagnosticSeverity.Warning, true), null, filePath);
+}