fix plex server identification (#833)

CHANGELOG.md

@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## [Unreleased]
 ### Fixed
 - Fix Jellyfin show library paging
+- Properly locate and identify multiple Plex servers
 
 ### Added
 - Add basic music video credits subtitle generation

ErsatzTV.Infrastructure/Plex/IPlexServerApi.cs

@@ -6,8 +6,8 @@ namespace ErsatzTV.Infrastructure.Plex;
 public interface IPlexServerApi
 {
     [Get("/")]
-    [Headers("Accept: application/json")]
-    public Task Ping(
+    [Headers("Accept: text/xml")]
+    public Task<PlexXmlMediaContainerPingResponse> Ping(
         [Query] [AliasAs("X-Plex-Token")]
         string token);
 

ErsatzTV.Infrastructure/Plex/Models/PlexMediaContainerResponse.cs

@@ -24,6 +24,13 @@ public class PlexXmlMediaContainerStatsResponse
     public int TotalSize { get; set; }
 }
 
+[XmlRoot("MediaContainer", Namespace = null)]
+public class PlexXmlMediaContainerPingResponse
+{
+    [XmlAttribute("machineIdentifier")]
+    public string MachineIdentifier { get; set; }
+}
+
 [XmlRoot("MediaContainer", Namespace = null)]
 public class PlexXmlVideoMetadataResponseContainer
 {

ErsatzTV.Infrastructure/Plex/PlexServerApiClient.cs

@@ -30,15 +30,9 @@ public class PlexServerApiClient : IPlexServerApiClient
     {
         try
         {
-            IPlexServerApi service = RestService.For<IPlexServerApi>(
-                new HttpClient
-                {
-                    BaseAddress = new Uri(connection.Uri),
-                    Timeout = TimeSpan.FromSeconds(5)
-                });
-
-            await service.Ping(token.AuthToken);
-            return true;
+            IPlexServerApi service = XmlServiceFor(connection.Uri, TimeSpan.FromSeconds(5));
+            PlexXmlMediaContainerPingResponse pingResult = await service.Ping(token.AuthToken);
+            return token.ClientIdentifier == pingResult.MachineIdentifier;
         }
         catch (Exception)
         {
@@ -362,14 +356,20 @@ public class PlexServerApiClient : IPlexServerApiClient
         return result.Values.ToList();
     }
 
-    private static IPlexServerApi XmlServiceFor(string uri)
+    private static IPlexServerApi XmlServiceFor(string uri, TimeSpan? timeout = null)
     {
         var overrides = new XmlAttributeOverrides();
         var attrs = new XmlAttributes { XmlIgnore = true };
         overrides.Add(typeof(PlexMetadataResponse), "Media", attrs);
 
+        TimeSpan httpClientTimeout = timeout ?? TimeSpan.FromSeconds(30);
+
         return RestService.For<IPlexServerApi>(
-            uri,
+            new HttpClient
+            {
+                BaseAddress = new Uri(uri),
+                Timeout = httpClientTimeout
+            },
             new RefitSettings
             {
                 ContentSerializer = new XmlContentSerializer(