feature: update expression browser and add plugin expression extensions

Disco.Web/Areas/API/Controllers/ExpressionsController.cs

@@ -1,17 +1,46 @@
 using Disco.Services.Authorization;
 using Disco.Services.Expressions;
+using Disco.Services.Plugins.Features.ExpressionExtensionProvider;
 using Disco.Services.Web;
+using System;
+using System.Web.Compilation;
 using System.Web.Mvc;
 
 namespace Disco.Web.Areas.API.Controllers
 {
-    [DiscoAuthorize(Claims.DiscoAdminAccount)]
     public partial class ExpressionsController : AuthorizedDatabaseController
     {
+        [HttpPost, DiscoAuthorize(Claims.DiscoAdminAccount)]
         public virtual ActionResult ValidateExpression(string Expression)
         {
             var part = new EvaluateExpressionPart(Expression);
-            return Json(Models.Expressions.ValidateExpressionModel.FromEvaluateExpressionPart(part), JsonRequestBehavior.AllowGet);
+            return Json(Models.Expressions.ValidateExpressionModel.FromEvaluateExpressionPart(part));
+        }
+
+        [HttpPost, DiscoAuthorize(Claims.Config.Show), ValidateAntiForgeryToken]
+        public virtual ActionResult TypeDescriptor(string type, bool staticMembersOnly = false)
+        {
+            if (string.IsNullOrWhiteSpace(type))
+                return new HttpStatusCodeResult(400, "Type is required");
+
+            var t = Type.GetType(type, false);
+
+            if (t == null)
+            {
+                var typeNameParts = type.Split(new string[] { ", " }, StringSplitOptions.None);
+                if (typeNameParts.Length < 2)
+                    return Json("Invalid Type Specified");
+
+                if (!ExpressionExtensionProviderFeature.TryGetExtensionAssembly(typeNameParts[1], out var assembly))
+                    return Json("Invalid Type Specified");
+
+                t = assembly.GetType(typeNameParts[0]);
+
+                if (t == null)
+                    return Json("Invalid Type Specified");
+            }
+
+            return Json(ExpressionTypeDescriptor.Build(t, staticMembersOnly));
         }
     }
 }