Fixed Indexer SwaggerUI, Added worker & call management endpoints to Indexer, restructuring to improve project separation

src/Shared/ApiKeyMiddleware.cs

@@ -0,0 +1,39 @@
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Primitives;
+
+namespace Shared;
+
+public class ApiKeyMiddleware
+{
+    private readonly RequestDelegate _next;
+    private readonly IConfiguration _configuration;
+
+    public ApiKeyMiddleware(RequestDelegate next, IConfiguration configuration)
+    {
+        _next = next;
+        _configuration = configuration;
+    }
+
+    public async Task InvokeAsync(HttpContext context)
+    {
+        if (!context.Request.Headers.TryGetValue("X-API-KEY", out StringValues extractedApiKey))
+        {
+            context.Response.StatusCode = 401;
+            await context.Response.WriteAsync("API Key is missing.");
+            return;
+        }
+
+        var validApiKeys = _configuration.GetSection("Embeddingsearch").GetSection("ApiKeys").Get<List<string>>();
+#pragma warning disable CS8604
+        if (validApiKeys == null || !validApiKeys.Contains(extractedApiKey)) // CS8604 extractedApiKey is not null here, but the compiler still thinks that it might be.
+        {
+            context.Response.StatusCode = 403;
+            await context.Response.WriteAsync("Invalid API Key.");
+            return;
+        }
+#pragma warning restore CS8604
+
+        await _next(context);
+    }
+}