Addd a new ReleaseCheckService to notify users of updates

Libraries/SPTarkov.Server.Core/Services/ReleaseCheckService.cs

@@ -0,0 +1,76 @@
+using System.Net.Http.Json;
+using System.Text.Json.Serialization;
+using SPTarkov.DI.Annotations;
+using SPTarkov.Server.Core.DI;
+using SPTarkov.Server.Core.Models.Utils;
+using SPTarkov.Server.Core.Utils;
+using Range = SemanticVersioning.Range;
+using Version = SemanticVersioning.Version;
+
+namespace SPTarkov.Server.Core.Services;
+
+// Note: We want to run after all mods, to avoid this being lost in mod log
+//       spam, so we purposely use MaxValue here
+
+[Injectable(TypePriority = int.MaxValue)]
+internal class ReleaseCheckService(ISptLogger<ReleaseCheckService> logger) : IOnLoad
+{
+    public Task OnLoad()
+    {
+        // Run in a new task so we don't hold the main thread at all, this isn't super critical
+        _ = Task.Run(CheckForUpdate);
+
+        return Task.CompletedTask;
+    }
+
+    private async Task CheckForUpdate()
+    {
+        try
+        {
+            var httpClient = new HttpClient();
+
+            // These headers are _required_ by GitHub API
+            httpClient.DefaultRequestHeaders.UserAgent.TryParseAdd("SP-Tarkov");
+            httpClient.DefaultRequestHeaders.Add("X-GitHub-Api-Version", "2022-11-28");
+
+            // TODO: We could probably throw this into a config somewhere, for now hard code it
+            var release = await httpClient.GetFromJsonAsync<ReleaseInformation>(
+                "https://api.github.com/repos/sp-tarkov/build/releases/latest"
+            );
+            if (release != null)
+            {
+                Version latestVersion = new(release.Version);
+                Version currentVersion = ProgramStatics.SPT_VERSION();
+                Range currentVersionRange = new($"~{currentVersion.Major}.{currentVersion.Minor}.0");
+
+                // First make sure the latest release is in our range, this stops "4.1.0" from being detected as a valid upgrade for "4.0.1"
+                if (!currentVersionRange.IsSatisfied(latestVersion))
+                {
+                    return;
+                }
+
+                // Notify the user if an upgrade is available
+                if (latestVersion > currentVersion)
+                {
+                    logger.Warning($"A new version of SPT is available! SPT v{release.Version}");
+                    logger.Warning($"Released {release.ReleaseDate.ToLocalTime()}");
+                    logger.Warning($"Release Notes: {release.DownloadUrl}");
+                }
+            }
+        }
+        // We ignore errors, this isn't critical to run, and we don't want to scare users
+        catch { }
+    }
+
+    private record ReleaseInformation
+    {
+        [JsonPropertyName("tag_name")]
+        public required string Version { get; init; }
+
+        [JsonPropertyName("html_url")]
+        public required string DownloadUrl { get; init; }
+
+        [JsonPropertyName("published_at")]
+        public required DateTime ReleaseDate { get; init; }
+    }
+}