Fix: Apply PEM cert support to HTTP client path and dispose _caCertificate

Co-authored-by: thomasneuberger <23504477+thomasneuberger@users.noreply.github.com>

Author: Copilot

TgHomeBot.SmartHome.HomeAssistant/Bootstrap.cs

@@ -24,7 +24,7 @@ public static IServiceCollection AddHomeAssistant(this IServiceCollection servic
                 var handler = new HttpClientHandler();
                 if (!string.IsNullOrEmpty(options.CertificateAuthorityPath))
                 {
-                    var certificate = X509CertificateLoader.LoadCertificateFromFile(options.CertificateAuthorityPath);
+                    var certificate = CertificateHelper.LoadCertificate(options.CertificateAuthorityPath);
                     handler.ServerCertificateCustomValidationCallback = (_, cert, chain, errors) =>
                     {
                         if (errors == SslPolicyErrors.None) return true;

TgHomeBot.SmartHome.HomeAssistant/CertificateHelper.cs

@@ -0,0 +1,33 @@
+using System.Security.Cryptography.X509Certificates;
+
+namespace TgHomeBot.SmartHome.HomeAssistant;
+
+internal static class CertificateHelper
+{
+    internal static X509Certificate2 LoadCertificate(string path)
+    {
+        const int maxScanLines = 50;
+        var isPem = false;
+
+        using (var reader = new StreamReader(path))
+        {
+            string? line;
+            var linesRead = 0;
+
+            while (linesRead < maxScanLines && (line = reader.ReadLine()) is not null)
+            {
+                linesRead++;
+
+                if (line.Contains("-----BEGIN CERTIFICATE-----", StringComparison.Ordinal))
+                {
+                    isPem = true;
+                    break;
+                }
+            }
+        }
+
+        return isPem
+            ? X509Certificate2.CreateFromPemFile(path)
+            : X509CertificateLoader.LoadCertificateFromFile(path);
+    }
+}

TgHomeBot.SmartHome.HomeAssistant/HomeAssistantMonitor.cs

@@ -27,7 +27,7 @@ public class HomeAssistantMonitor(
     private readonly CancellationTokenSource _cancellationTokenSource = new();
     private readonly X509Certificate2? _caCertificate = string.IsNullOrEmpty(options.Value.CertificateAuthorityPath)
         ? null
-        : LoadCertificate(options.Value.CertificateAuthorityPath);
+        : CertificateHelper.LoadCertificate(options.Value.CertificateAuthorityPath);
 
     private bool _reconnect;
 
@@ -276,33 +276,6 @@ private async Task ProcessEvent(string message)
         }
     }
 
-    private static X509Certificate2 LoadCertificate(string path)
-    {
-        const int maxScanLines = 50;
-        var isPem = false;
-
-        using (var reader = new StreamReader(path))
-        {
-            string? line;
-            var linesRead = 0;
-
-            while (linesRead < maxScanLines && (line = reader.ReadLine()) is not null)
-            {
-                linesRead++;
-
-                if (line.Contains("-----BEGIN CERTIFICATE-----", StringComparison.Ordinal))
-                {
-                    isPem = true;
-                    break;
-                }
-            }
-        }
-
-        return isPem
-            ? X509Certificate2.CreateFromPemFile(path)
-            : X509CertificateLoader.LoadCertificateFromFile(path);
-    }
-
     private static DeviceState GetState(DeviceStateThresholds deviceThresholds, string state)
     {
         if (!float.TryParse(state, out var value))
@@ -353,5 +326,6 @@ public void Dispose()
         _cancellationTokenSource.Cancel();
         _webSocket?.Dispose();
         _cancellationTokenSource.Dispose();
+        _caCertificate?.Dispose();
     }
 }