Fixed an authentication quirk where theqBittorrent API returns a 403 instead of a 401 when its unauthorized.

client/src/app/auth.interceptor.ts

@@ -1,14 +1,14 @@
-import { Injectable } from '@angular/core';
 import {
-  HttpEvent,
-  HttpInterceptor,
-  HttpHandler,
-  HttpRequest,
   HttpErrorResponse,
+  HttpEvent,
+  HttpHandler,
+  HttpInterceptor,
+  HttpRequest,
 } from '@angular/common/http';
-import { throwError, Observable } from 'rxjs';
-import { catchError } from 'rxjs/operators';
+import { Injectable } from '@angular/core';
 import { Router } from '@angular/router';
+import { Observable, throwError } from 'rxjs';
+import { catchError } from 'rxjs/operators';
 
 @Injectable()
 export class AuthInterceptor implements HttpInterceptor {
@@ -20,7 +20,7 @@ export class AuthInterceptor implements HttpInterceptor {
   ): Observable<HttpEvent<any>> {
     return next.handle(req).pipe(
       catchError((error: HttpErrorResponse) => {
-        if (error && error.status === 401) {
+        if (error && (error.status === 401 || error.status === 403)) {
           this.router.navigate(['/login']);
         }
         return throwError(error);

server/RdtClient.Service/Middleware/AuthorizeMiddleware.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Net;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+
+namespace RdtClient.Service.Middleware
+{
+    public class AuthorizeMiddleware
+    {
+        readonly RequestDelegate _next;
+
+        public AuthorizeMiddleware(RequestDelegate next)
+        {
+            _next = next;
+        }
+
+        /// <summary>
+        /// Return a 403 instead of a 401, it's quirk that QBittorrent has.
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns></returns>
+        public async Task Invoke(HttpContext context)
+        {
+            await _next(context);
+
+            if (context.Response.StatusCode == (Int32) HttpStatusCode.Unauthorized)
+            {
+                context.Response.StatusCode = (Int32) HttpStatusCode.Forbidden;
+            }
+        }
+    }
+}

server/RdtClient.Web/Startup.cs

@@ -94,6 +94,8 @@ namespace RdtClient.Web
 
             app.ConfigureExceptionHandler();
 
+            app.UseMiddleware<AuthorizeMiddleware>();
+
             app.Use(async (context, next) =>
             {
                 await next.Invoke();