Add auto updater

PamhagenSysCtrl/Helpers/Config.cs

@@ -9,6 +9,8 @@ namespace PamhagenSysCtrl.Helpers {
         private readonly string FileName;
 
         public string PlcPort = "COM1";
+        public string? UpdateUrl = "https://elwig.at/files/pamhagen-sysctrl/?format=json";
+        public bool UpdateAuto = true;
 
         public Config(string filename) {
             FileName = filename;
@@ -19,6 +21,9 @@ namespace PamhagenSysCtrl.Helpers {
             try {
                 var config = new ConfigurationBuilder().AddIniFile(FileName).Build();
                 PlcPort = config["plc:port"] ?? "COM1";
+                UpdateUrl = config["update:url"] ?? UpdateUrl;
+                var updateAuto = config["update:auto"];
+                UpdateAuto = updateAuto == null || TrueValues.Contains(updateAuto.ToLower());
             } catch (Exception exc) {
                 MessageBox.Show($"Die Konfigurationsdatei konnte nicht gelesen werden:\n\n{exc.Message}", "Konfigurationsdatei lesen", MessageBoxButton.OK, MessageBoxImage.Error);
                 Application.Current.Shutdown();

PamhagenSysCtrl/Helpers/UpdateService.cs

@@ -0,0 +1,74 @@
+using System.Diagnostics;
+using System.IO;
+using System.Net.Http;
+using System.Text.Json.Nodes;
+
+namespace PamhagenSysCtrl.Helpers {
+    public sealed record UpdateInstaller(Version Version, Uri Url, long Size);
+
+    public static class UpdateService {
+
+        private static readonly HttpClient HttpClient = new() {
+            Timeout = Timeout.InfiniteTimeSpan,
+        };
+
+        public static async Task<UpdateInstaller> GetLatestInstallerAsync(string feedUrl, CancellationToken cancellationToken = default) {
+            using var response = await HttpClient.GetAsync(feedUrl, cancellationToken);
+            response.EnsureSuccessStatusCode();
+
+            var json = JsonNode.Parse(await response.Content.ReadAsStringAsync(cancellationToken));
+            var latest = json!["data"]!.AsArray()[^1]!;
+            return new(
+                new Version((string)latest["version"]!),
+                new Uri((string)latest["url"]!),
+                (long)latest["size"]!
+            );
+        }
+
+        public static async Task<string> DownloadInstallerAsync(UpdateInstaller installer, string targetDirectory, IProgress<double>? progress = null, CancellationToken cancellationToken = default) {
+            Directory.CreateDirectory(targetDirectory);
+            var fileName = Path.Combine(targetDirectory, $"PamhagenSysCtrl-{installer.Version}.msi");
+
+            try {
+                using var response = await HttpClient.GetAsync(installer.Url, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
+                response.EnsureSuccessStatusCode();
+                var contentLength = response.Content.Headers.ContentLength;
+
+                await using (var destination = new FileStream(fileName, FileMode.Create)) {
+                    await using var source = await response.Content.ReadAsStreamAsync(cancellationToken);
+                    var buffer = new byte[81920];
+                    long downloaded = 0;
+                    int read;
+                    while ((read = await source.ReadAsync(buffer, cancellationToken)) != 0) {
+                        await destination.WriteAsync(buffer.AsMemory(0, read), cancellationToken);
+                        downloaded += read;
+                        if (contentLength.HasValue) {
+                            progress?.Report((double)downloaded / contentLength.Value);
+                        }
+                    }
+                }
+
+                progress?.Report(1);
+                return fileName;
+            } catch {
+                File.Delete(fileName);
+                throw;
+            }
+        }
+
+        public static void StartInstaller(string fileName) {
+            var startInfo = new ProcessStartInfo {
+                FileName = "msiexec.exe",
+                UseShellExecute = true,
+                Verb = "runas",
+            };
+            startInfo.ArgumentList.Add("/i");
+            startInfo.ArgumentList.Add(Path.GetFullPath(fileName));
+
+            if (Process.Start(startInfo) == null) {
+                throw new InvalidOperationException("Der Installer konnte nicht gestartet werden.");
+            }
+        }
+
+    }
+}