From 64c1e1fa549c4894112b5e743f6fea737d859e89 Mon Sep 17 00:00:00 2001
From: Qstick <qstick@gmail.com>
Date: Thu, 3 Feb 2022 23:16:20 -0600
Subject: [PATCH] Fixed: (Cardigann) Treat "Refresh" header as redirect

Fixes #812
---
 src/NzbDrone.Common/Http/HttpClient.cs   |  2 +-
 src/NzbDrone.Common/Http/HttpResponse.cs | 19 +++++++++++++++++--
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/NzbDrone.Common/Http/HttpClient.cs b/src/NzbDrone.Common/Http/HttpClient.cs
index 9c1e2221c..7be59b663 100644
--- a/src/NzbDrone.Common/Http/HttpClient.cs
+++ b/src/NzbDrone.Common/Http/HttpClient.cs
@@ -75,7 +75,7 @@ namespace NzbDrone.Common.Http
 
                 do
                 {
-                    request.Url += new HttpUri(response.Headers.GetSingleValue("Location"));
+                    request.Url = new HttpUri(response.RedirectUrl);
                     autoRedirectChain.Add(request.Url.ToString());
 
                     _logger.Trace("Redirected to {0}", request.Url);
diff --git a/src/NzbDrone.Common/Http/HttpResponse.cs b/src/NzbDrone.Common/Http/HttpResponse.cs
index d108705b3..819b3b805 100644
--- a/src/NzbDrone.Common/Http/HttpResponse.cs
+++ b/src/NzbDrone.Common/Http/HttpResponse.cs
@@ -9,7 +9,7 @@ namespace NzbDrone.Common.Http
 {
     public class HttpResponse
     {
-        private static readonly Regex RegexSetCookie = new Regex("^(.*?)=(.*?)(?:;|$)", RegexOptions.Compiled);
+        private static readonly Regex RegexRefresh = new Regex("^(.*?url)=(.*?)(?:;|$)", RegexOptions.Compiled);
 
         public HttpResponse(HttpRequest request, HttpHeader headers, CookieCollection cookies, byte[] binaryData, long elapsedTime = 0, HttpStatusCode statusCode = HttpStatusCode.OK)
         {
@@ -67,7 +67,8 @@ namespace NzbDrone.Common.Http
                                        StatusCode == HttpStatusCode.MovedPermanently ||
                                        StatusCode == HttpStatusCode.RedirectMethod ||
                                        StatusCode == HttpStatusCode.TemporaryRedirect ||
-                                       StatusCode == HttpStatusCode.Found;
+                                       StatusCode == HttpStatusCode.Found ||
+                                       Headers.ContainsKey("Refresh");
 
         public string RedirectUrl
         {
@@ -76,6 +77,20 @@ namespace NzbDrone.Common.Http
                 var newUrl = Headers["Location"];
                 if (newUrl == null)
                 {
+                    newUrl = Headers["Refresh"];
+
+                    if (newUrl == null)
+                    {
+                        return string.Empty;
+                    }
+
+                    var match = RegexRefresh.Match(newUrl);
+
+                    if (match.Success)
+                    {
+                        return (Request.Url += new HttpUri(match.Groups[2].Value)).FullUri;
+                    }
+
                     return string.Empty;
                 }