Elsa Agents: Add service provider discovery endpoint

src/modules/agents/Elsa.Agents.Api/Endpoints/ServiceProviders/List/Endpoint.cs

@@ -0,0 +1,27 @@
+using Elsa.Abstractions;
+using Elsa.Agents;
+using Elsa.Models;
+using JetBrains.Annotations;
+
+namespace Elsa.Agents.Api.Endpoints.ServiceProviders.List;
+
+/// <summary>
+/// Lists all registered service providers.
+/// </summary>
+[UsedImplicitly]
+public class Endpoint(IServiceDiscoverer serviceDiscoverer) : ElsaEndpointWithoutRequest<ListResponse<string>>
+{
+    /// <inheritdoc />
+    public override void Configure()
+    {
+        Get("/ai/service-providers");
+        ConfigurePermissions("ai/services:read");
+    }
+
+    /// <inheritdoc />
+    public override Task<ListResponse<string>> ExecuteAsync(CancellationToken ct)
+    {
+        var providers = serviceDiscoverer.Discover().Select(x => x.Name).ToList();
+        return Task.FromResult(new ListResponse<string>(providers));
+    }
+}

src/modules/agents/Elsa.Studio.Agents/Client/IServiceProvidersApi.cs

@@ -0,0 +1,12 @@
+using Elsa.Api.Client.Shared.Models;
+using Refit;
+
+namespace Elsa.Studio.Agents.Client;
+
+///  Represents a client API for retrieving available service providers.
+public interface IServiceProvidersApi
+{
+    /// Lists all service providers.
+    [Get("/ai/service-providers")]
+    Task<ListResponse<string>> ListAsync(CancellationToken cancellationToken = default);
+}

src/modules/agents/Elsa.Studio.Agents/UI/Pages/Service.razor

@@ -31,9 +31,10 @@
                                    Label="@Localizer["Type"]"
                                    Variant="Variant.Outlined"
                                    HelperText="@Localizer["The type of the service."]">
-                            <MudSelectItem T="string" Value="@("OpenAIChatCompletion")">@Localizer["OpenAIChatCompletion"]</MudSelectItem>
-                            <MudSelectItem T="string" Value="@("OpenAIEmbeddingGenerator")">@Localizer["OpenAIEmbeddingGenerator"]</MudSelectItem>
-                            <MudSelectItem T="string" Value="@("OpenAITextToImage")">@Localizer["OpenAITextToImage"]</MudSelectItem>
+                            @foreach (var provider in _serviceProviders)
+                            {
+                                <MudSelectItem T="string" Value="@provider">@Localizer[provider]</MudSelectItem>
+                            }
                         </MudSelect>
 
                         <MudTextField @bind-Value="_entity.Settings"

src/modules/agents/Elsa.Studio.Agents/UI/Pages/Service.razor.cs

@@ -22,6 +22,16 @@ public partial class Service : StudioComponentBase
     private MudForm _form = null!;
     private ServiceInputModelValidator _validator = null!;
     private ServiceModel _entity = new();
+    private ICollection<string> _serviceProviders = [];
+
+    /// <inheritdoc />
+    protected override async Task OnInitializedAsync()
+    {
+        await base.OnInitializedAsync();
+        var providersApi = await ApiClientProvider.GetApiAsync<IServiceProvidersApi>();
+        var response = await providersApi.ListAsync();
+        _serviceProviders = response.Items;
+    }
 
     /// <inheritdoc />
     protected override async Task OnParametersSetAsync()