Ping TubeArchivist API when saving configuration and at boot

Jellyfin.Plugin.TubeArchivistMetadata/TubeArchivist/PingResponse.cs

@@ -0,0 +1,44 @@
+using Newtonsoft.Json;
+
+namespace Jellyfin.Plugin.TubeArchivistMetadata.TubeArchivist
+{
+    /// <summary>
+    /// A class representing TubeArchivist API ping response data.
+    /// </summary>
+    public class PingResponse
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PingResponse"/> class.
+        /// </summary>
+        /// <param name="response">Response from the API ("pong").</param>
+        /// <param name="user">TubeArchivist user id.</param>
+        /// <param name="version">TubeArchivist version.</param>
+        public PingResponse(
+            string response,
+            int user,
+            string version)
+        {
+            this.Response = response;
+            this.User = user;
+            this.Version = version;
+        }
+
+        /// <summary>
+        /// Gets response to the ping ("pong").
+        /// </summary>
+        [JsonProperty(PropertyName = "response")]
+        public string Response { get; }
+
+        /// <summary>
+        /// Gets user id.
+        /// </summary>
+        [JsonProperty(PropertyName = "user")]
+        public int User { get; }
+
+        /// <summary>
+        /// Gets TubeArchivist version.
+        /// </summary>
+        [JsonProperty(PropertyName = "version")]
+        public string Version { get; }
+    }
+}

Jellyfin.Plugin.TubeArchivistMetadata/TubeArchivist/TubeArchivistApi.cs

@@ -116,5 +116,35 @@ namespace Jellyfin.Plugin.TubeArchivistMetadata.TubeArchivist
 
             return video?.Data;
         }
+
+        /// <summary>
+        /// Validates connection and authentication to TubeArchivist.
+        /// </summary>
+        /// <returns>The ping response.</returns>
+        public async Task<PingResponse?> Ping()
+        {
+            PingResponse? pong = null;
+
+            var pingEndpoint = "/api/ping/";
+            var url = new Uri(Utils.SanitizeUrl(Plugin.Instance!.Configuration.TubeArchivistUrl + pingEndpoint));
+            var response = await client.GetAsync(url).ConfigureAwait(true);
+
+            while (response.StatusCode == HttpStatusCode.Moved)
+            {
+                url = response.Headers.Location;
+                _logger.LogInformation("{Message}", "Received redirect to: " + url);
+                response = await client.GetAsync(url).ConfigureAwait(true);
+            }
+
+            _logger.LogInformation("{Message}", url + ": " + response.StatusCode);
+
+            if (response.IsSuccessStatusCode)
+            {
+                string rawData = await response.Content.ReadAsStringAsync().ConfigureAwait(true);
+                pong = JsonConvert.DeserializeObject<PingResponse>(rawData);
+            }
+
+            return pong;
+        }
     }
 }