Avoid exposing the method called ConfigureWebApplicationBuilder to th…

…e plugins

* Replace the PluginStartup interface with IDependencyServicesRegisterer (it is a more descriptive name)

* Replace the ConfigureWebApplicationBuilder method with RegisterServices(IServiceCollection, IConfiguration).

The consumer should not be able to use the type called WebApplicationBuilder in its plugins, because it has the absolute freedom to build the web application through the Build() method and this does not make sense, since it is the responsibility of the host application.

src/HostApplication/PluginStartup.cs

@@ -3,15 +3,15 @@
 public static class PluginStartup
 {
     /// <summary>
-    /// Configures the application plug-ins.
+    /// Configures the plugins.
     /// </summary>
     public static void Configure(WebApplicationBuilder builder)
     {
         var envConfiguration = new CPluginEnvConfiguration();
         PluginLoader.Load(envConfiguration);
-        var startups = TypeFinder.FindSubtypesOf<IPluginStartup>();
-        foreach (var pluginStartup in startups)
-            pluginStartup.ConfigureWebApplicationBuilder(builder);
+        var dependencyServicesRegisterers = TypeFinder.FindSubtypesOf<IDependencyServicesRegisterer>();
+        foreach (var dependencyServicesRegisterer in dependencyServicesRegisterers)
+            dependencyServicesRegisterer.RegisterServices(builder.Services, builder.Configuration);
 
         var modelCreatings = TypeFinder.FindSubtypesOf<IModelCreating>();
         builder.Services.AddSingleton(modelCreatings);

src/Plugins/AppointmentReminders/DependencyServicesRegisterer.cs

@@ -0,0 +1,11 @@
+[assembly: Plugin(typeof(DependencyServicesRegisterer))]
+
+namespace Plugin.AppointmentReminders;
+
+public class DependencyServicesRegisterer : IDependencyServicesRegisterer
+{
+    public void RegisterServices(IServiceCollection services, IConfiguration configuration)
+    {
+        services.AddReminderServices();
+    }
+}

src/Plugins/ChatBot/DependencyServicesRegisterer.cs

@@ -0,0 +1,11 @@
+[assembly: Plugin(typeof(DependencyServicesRegisterer))]
+
+namespace Plugin.ChatBot;
+
+public class DependencyServicesRegisterer : IDependencyServicesRegisterer
+{
+    public void RegisterServices(IServiceCollection services, IConfiguration configuration)
+    {
+        services.AddBotServices(configuration);
+    }
+}

src/Plugins/ChatBot/Helpers/AdaptiveCardsLoader.cs

@@ -10,7 +10,7 @@ static AdaptiveCardsLoader()
         s_basePath = Path.Combine(AppContext.BaseDirectory, "AdaptiveCards");
         if (Directory.Exists(s_basePath)) return;
 
-        var rootNamespace = typeof(PluginStartup).Namespace;
+        var rootNamespace = typeof(DependencyServicesRegisterer).Namespace;
         // This path is used by the Host Application.
         var path2 = $"plugins/{rootNamespace}/AdaptiveCards";
         s_basePath = Path.Combine(AppContext.BaseDirectory, path2);

src/Plugins/SendGrid/DependencyServicesRegisterer.cs

@@ -0,0 +1,14 @@
+[assembly: Plugin(typeof(DependencyServicesRegisterer))]
+
+namespace Plugin.SendGrid;
+
+public class DependencyServicesRegisterer : IDependencyServicesRegisterer
+{
+    public void RegisterServices(IServiceCollection services, IConfiguration configuration)
+    {
+        var settings = new EnvBinder().Bind<SendGridSettings>();
+        services.AddSendGrid(options => options.ApiKey = settings.SendGridApiKey);
+        services.AddScoped<IEmailService, EmailService>();
+        services.AddSingleton(settings);
+    }
+}

src/Plugins/TwilioWhatsApp/DependencyServicesRegisterer.cs

@@ -0,0 +1,13 @@
+[assembly: Plugin(typeof(DependencyServicesRegisterer))]
+
+namespace Plugin.Twilio.WhatsApp;
+
+public class DependencyServicesRegisterer : IDependencyServicesRegisterer
+{
+    public void RegisterServices(IServiceCollection services, IConfiguration configuration)
+    {
+        var settings = new EnvBinder().Bind<TwilioSettings>();
+        services.AddSingleton<IInstantMessaging, WhatsAppMessaging>();
+        services.AddSingleton(settings);
+    }
+}

src/Shared/Interfaces/IDependencyServicesRegisterer.cs

@@ -0,0 +1,18 @@
+namespace DentallApp.Shared.Interfaces;
+
+/// <summary>
+/// Base type for initializing services used by a plugin.
+/// </summary>
+public interface IDependencyServicesRegisterer
+{
+    /// <summary>
+    /// Register services into the <see cref="IServiceCollection"/>.
+    /// </summary>
+    /// <param name="services">
+    /// The <see cref="IServiceCollection"/> to add the services to.
+    /// </param>
+    /// <param name="configuration">
+    /// The set of key/value configuration properties.
+    /// </param>
+    void RegisterServices(IServiceCollection services, IConfiguration configuration);
+}