Pass certificate into MQTT client service

Mortein/Mqtt/Extensions/ServiceCollectionExtension.cs

@@ -10,17 +10,16 @@ namespace Mortein.Mqtt.Extensions;
 /// </summary>
 public static class ServiceCollectionExtension
 {
-    // TODO: read from somewhere other than the local filesystem.
-    private static readonly X509Certificate2 certificate = new("/workspaces/api/api.pfx");
-
     /// <summary>
     /// Registers a hosted MQTT client as a service in the <see cref="IServiceCollection" />.
     /// </summary>
     ///
     /// <param name="services">The <see cref="IServiceCollection" /> to add services to.</param>
+    /// 
+    /// <param name="certificate">The <see cref="X509Certificate2"/> with which to authenticate.</param>
     ///
     /// <returns>The same service collection so that multiple calls can be chained.</returns>
-    public static IServiceCollection AddMqttClientHostedService(this IServiceCollection services)
+    public static IServiceCollection AddMqttClientHostedService(this IServiceCollection services, X509Certificate2 certificate)
     {
         services.AddMqttClientServiceWithConfig(optionsBuilder =>
         {

Mortein/Startup.cs

@@ -3,6 +3,7 @@
 using Mortein.Types;
 using NodaTime.Serialization.SystemTextJson;
 using System.Reflection;
+using System.Security.Cryptography.X509Certificates;
 
 namespace Mortein;
 
@@ -20,6 +21,9 @@ public class Startup(IConfiguration configuration)
     /// </summary>
     public IConfiguration Configuration { get; } = configuration;
 
+    // TODO: read from somewhere other than the local filesystem.
+    private static X509Certificate2 AwsMqttCertificate => new("/workspaces/api/api.pfx");
+
     /// <summary>
     /// Add services to the container.
     /// </summary>
@@ -37,7 +41,7 @@ public void ConfigureServices(IServiceCollection services)
         });
         services.AddDbContext<DatabaseContext>();
         services.AddEndpointsApiExplorer();
-        services.AddMqttClientHostedService();
+        services.AddMqttClientHostedService(AwsMqttCertificate);
         services.AddSwaggerGen(options =>
         {
             options.SwaggerDoc("openapi", new OpenApiInfo()