[backend/asp] Add ExceptionVerbosity level Debug

Iceshrimp.Backend/Core/Middleware/ErrorHandlerMiddleware.cs

@@ -97,9 +97,9 @@ public class ErrorHandlerMiddleware(
 						StatusCode = ctx.Response.StatusCode,
 						Error      = verbosity >= ExceptionVerbosity.Basic ? ce.Error : ce.StatusCode.ToString(),
 						Message    = verbosity >= ExceptionVerbosity.Basic ? ce.Message : null,
-						Details    = verbosity == ExceptionVerbosity.Full ? ce.Details : null,
-						Errors     = verbosity == ExceptionVerbosity.Full ? (ce as ValidationException)?.Errors : null,
-						Source     = verbosity == ExceptionVerbosity.Full ? type : null,
+						Details    = verbosity >= ExceptionVerbosity.Full ? ce.Details : null,
+						Errors     = verbosity >= ExceptionVerbosity.Full ? (ce as ValidationException)?.Errors : null,
+						Source     = verbosity >= ExceptionVerbosity.Full ? type : null,
 						RequestId  = ctx.TraceIdentifier
 					};
 
@@ -125,7 +125,7 @@ public class ErrorHandlerMiddleware(
 					StatusCode = 500,
 					Error      = "Internal Server Error",
 					Message    = verbosity >= ExceptionVerbosity.Basic ? e.Message : null,
-					Source     = verbosity == ExceptionVerbosity.Full ? type : null,
+					Source     = verbosity >= ExceptionVerbosity.Full ? type : null,
 					RequestId  = ctx.TraceIdentifier
 				};
 
@@ -294,5 +294,6 @@ public enum ExceptionVerbosity
 	[SuppressMessage("ReSharper", "UnusedMember.Global")]
 	None = 0,
 	Basic = 1,
-	Full  = 2
+	Full  = 2,
+	Debug = 3,
 }

Iceshrimp.Backend/Pages/Shared/ErrorPage.cshtml

@@ -5,6 +5,7 @@
 @using Microsoft.Extensions.Options
 @model ErrorPageModel
 @inject IOptions<Config.InstanceSection>         Instance
+@inject IOptions<Config.SecuritySection>         Security
 @{
     // Not meant for direct consumption, use with RazorViewRenderService.
     Layout = null;
@@ -41,7 +42,6 @@
 }
 @if (Model.Error.Errors is { Count: > 0 } errors)
 {
-    <p>
     @foreach (var error in errors)
     {
         <strong>@error.Key</strong>
@@ -52,7 +52,6 @@
             }
         </ul>
     }
-    </p>
 }
 @if (Model.Error.Source != null)
 {
@@ -65,6 +64,12 @@
     <strong>Request ID:</strong>
     <code>@Model.Error.RequestId</code>
 </p>
+
+@if (Security.Value.ExceptionVerbosity >= ExceptionVerbosity.Debug)
+{
+    <pre><code>@Model.Error.Exception.ToString()</code></pre>
+}
+
 <footer>
     <strong>Iceshrimp.NET</strong> v@(Instance.Value.Version)
     @if (Model.Error.Exception is PublicPreviewDisabledException)

Iceshrimp.Backend/configuration.ini

@@ -43,7 +43,11 @@ AllowLocalIPv4 = false
 AllowLocalIPv6 = false
 
 ;; The level of detail in API error responses
-;; Options: [None, Basic, Full]
+;; Options: [None, Basic, Full, Verbose]
+;;  - 'None' only returns the request identifier & status code
+;;  - 'Basic' adds the error code & message
+;;  - 'Full' adds error details (if any) and the name of the class that caused the exception
+;;  - 'Debug' adds the stack trace (HTML only)
 ExceptionVerbosity = Basic
 
 ;; Whether to allow instance registrations