resolves #4899: output cache for sitemap

Oqtane.Server/Controllers/CacheController.cs

@@ -0,0 +1,31 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+
+using Oqtane.Models;
+using Oqtane.Services;
+using Oqtane.Shared;
+
+namespace Oqtane.Controllers
+{
+    [Route(ControllerRoutes.ApiRoute)]
+    public class CacheController : Controller
+    {
+        private readonly ICacheService _cacheService;
+
+        public CacheController(ICacheService cacheService)
+        {
+            _cacheService = cacheService;
+        }
+
+        // DELETE api/<controller>/outputCache/evictByTag/{tag}
+        [HttpDelete("outputCache/evictByTag/{tag}")]
+        [Authorize(Roles = RoleNames.Admin)]
+        public async Task EvictOutputCacheByTag(string tag, CancellationToken cancellationToken = default)
+        {
+            await _cacheService.EvictOutputCacheByTag(tag, cancellationToken);
+        }
+    }
+}