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using HyperBooru.ApiModels;
using System.Reflection;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Text.Json.Serialization.Metadata;
namespace HyperBooru;
// Middleware class to intercept API controller exceptions and
// return said exceptions to API clients as serialized JSON objects
public sealed class ExceptionMiddleware {
private RequestDelegate next;
public ExceptionMiddleware(RequestDelegate next) =>
this.next = next;
public async Task Invoke(HttpContext context) {
try {
await next(context);
} catch(HBException e) {
context.Response.ContentType = "application/json";
context.Response.StatusCode =
e.GetType().GetCustomAttribute<ExceptionStatusCodeAttribute>()?.StatusCode ??
StatusCodes.Status500InternalServerError;
context.Response.Clear();
await context.Response.WriteAsJsonAsync(e);
} catch(Exception) {
context.Response.StatusCode = StatusCodes.Status500InternalServerError;
context.Response.ContentType = "application/json";
context.Response.Clear();
await context.Response.WriteAsJsonAsync(new ServerException());
}
}
}
// This class is needed as the JSON serializer often fails to serialize
// members of the native 'Exception' class
public sealed class ExceptionJsonResolver : DefaultJsonTypeInfoResolver {
public override JsonTypeInfo GetTypeInfo(Type type, JsonSerializerOptions options) {
var info = base.GetTypeInfo(type, options);
if(!typeof(Exception).IsAssignableFrom(type))
return info;
string[] excludedProps = [
"data",
"hResult",
"helpLink",
"innerException",
"source",
"stackTrace",
"targetSite"
];
foreach(var p in info.Properties.Where(p => excludedProps.Contains(p.Name)))
p.ShouldSerialize = (_, _) => false;
return info;
}
}
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