Add a get poster method

Author: Pouleyy

Source/Plex.Library/ApiModels/Servers/Server.cs

@@ -636,5 +636,13 @@ public async Task<PlaylistContainer> Playlists() =>
         /// <returns>A <see cref="MediaContainer"/> containing the media info.</returns>
         public async Task<MediaContainer> Metadata(string ratingKey) =>
             await this.plexServerClient.GetMediaMetadataAsync(this.AccessToken, this.Uri.ToString(), ratingKey);
+
+        /// <summary>
+        /// Get poster for a given rating key.
+        /// </summary>
+        /// <param name="ratingKey">The rating key to get poster from.</param>
+        /// <returns>A <see cref="MediaContainer"/> containing the media info.</returns>
+        public async Task<MediaContainer> Posters(string ratingKey) =>
+            await this.plexServerClient.GetMediaPosterAsync(this.AccessToken, this.Uri.ToString(), ratingKey);
     }
 }

Source/Plex.ServerApi/Clients/Interfaces/IPlexServerClient.cs

@@ -155,6 +155,15 @@ public interface IPlexServerClient
         /// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
         Task<MediaContainer> GetChildrenMetadataAsync(string authToken, string plexServerHost, int id);
 
+        /// <summary>
+        /// Get posters for a given Plex rating key.
+        /// </summary>
+        /// <param name="authToken">Authentication Token.</param>
+        /// <param name="plexServerHost">Plex Host Uri.</param>
+        /// <param name="key">Rating Key.</param>
+        /// <returns></returns>
+        Task<MediaContainer> GetMediaPosterAsync(string authToken, string plexServerHost, string key);
+
         /// <summary>
         /// Marks the Item in plex as 'Played'.
         /// </summary>

Source/Plex.ServerApi/Clients/PlexServerClient.cs

@@ -212,6 +212,9 @@ public async Task<MediaContainer> GetChildrenMetadataAsync(string authToken, str
             // return plexMediaContainer;
         }
 
+        /// <inheritdoc/>
+        public async Task<MediaContainer> GetMediaPosterAsync(string authToken, string plexServerHost, string key) => await this.FetchWithWrapper<MediaContainer>(plexServerHost, $"library/metadata/{key}/posters", authToken, HttpMethod.Get);
+
         /// <inheritdoc/>
         public async Task<PlexServer> GetPlexServerInfo(string authToken, string plexServerHost)
         {

Source/Plex.ServerApi/PlexModels/Media/Metadata.cs

@@ -110,6 +110,12 @@ public class Metadata
         [JsonPropertyName("thumb")]
         public string Thumb { get; set; }
 
+        [JsonPropertyName("selected")]
+        public bool Selected { get; set; }
+
+        [JsonPropertyName("provider")]
+        public string Provider { get; set; }
+
         [JsonPropertyName("art")]
         public string Art { get; set; }