initial commit

App_Code/Exceptions/ExceptionMiddleware.cs

@@ -0,0 +1,72 @@
+using Microsoft.AspNetCore.Http;
+using System.Net;
+using System.Text;
+using System.Text.Json;
+
+namespace Library;
+
+public class ExceptionMiddleware
+{
+	private readonly RequestDelegate _next;
+
+	public ExceptionMiddleware( RequestDelegate next )
+	{
+		_next = next;
+	}
+
+	public async Task InvokeAsync( HttpContext httpContext )
+	{
+		try
+		{
+			await _next( httpContext );
+		}
+		catch ( RedirectException exception )
+		{
+			HandleExceptionAsync( httpContext , exception );
+		}
+		catch ( ErrorException exception )
+		{
+			await HandleErrorAsync( httpContext , exception );
+		}
+		catch ( APIErrorException exception )
+		{
+			await HandleApiErrorAsync( httpContext , exception );
+		}
+		catch ( Exception exception )
+		{
+			await HandleExceptionAsync( httpContext , exception );
+		}
+	}
+
+	private void HandleExceptionAsync( HttpContext context , RedirectException exception )
+	{
+		context.Response.Redirect( exception.Destination );
+	}
+
+	private static Task HandleErrorAsync( HttpContext context , ErrorException exception )
+	{
+		context.Response.StatusCode = 500;
+		return context.Response.WriteAsync( exception.ErrorMessage );
+	}
+	private static Task HandleApiErrorAsync( HttpContext context , APIErrorException exception )
+	{
+		using MemoryStream stream = new( );
+
+		using Utf8JsonWriter writer = new( stream );
+		writer.WriteStartObject( );
+		writer.WriteBoolean( "Success" , false );
+		writer.WriteString( "ErrorMessage" , exception.ErrorMessage );
+		writer.WriteEndObject( );
+		writer.Dispose( );
+
+		context.Response.ContentType = System.Net.Mime.MediaTypeNames.Application.Json;
+		return context.Response.WriteAsync( Encoding.UTF8.GetString( stream.ToArray( ) ) );
+	}
+
+	private static Task HandleExceptionAsync( HttpContext context , Exception exception )
+	{
+		context.Response.ContentType = System.Net.Mime.MediaTypeNames.Text.Plain;
+		context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
+		return context.Response.WriteAsync( exception.ToString( ) );
+	}
+}