Migrates EnsureUserPermissionForContentAttribute to authz policies

src/Umbraco.Web.BackOffice/Authorization/ContentPermissionsQueryStringRequirement.cs

@@ -0,0 +1,38 @@
+using Microsoft.AspNetCore.Authorization;
+
+namespace Umbraco.Web.BackOffice.Authorization
+{
+
+    /// <summary>
+    /// An authorization requirement for <see cref="ContentPermissionQueryStringHandler"/>
+    /// </summary>
+    public class ContentPermissionsQueryStringRequirement : IAuthorizationRequirement
+    {
+       
+        /// <summary>
+        /// Create an authorization requirement for a specific node id
+        /// </summary>
+        /// <param name="nodeId"></param>
+        /// <param name="permissionToCheck"></param>
+        public ContentPermissionsQueryStringRequirement(int nodeId, char permissionToCheck)
+        {
+            NodeId = nodeId;
+            PermissionToCheck = permissionToCheck;
+        }
+
+        /// <summary>
+        /// Create an authorization requirement for a node id based on a query string parameter
+        /// </summary>
+        /// <param name="paramName"></param>
+        /// <param name="permissionToCheck"></param>
+        public ContentPermissionsQueryStringRequirement(char permissionToCheck, string[] paramNames)
+        {
+            QueryStringNames = paramNames;
+            PermissionToCheck = permissionToCheck;
+        }
+
+        public int? NodeId { get; }
+        public string[] QueryStringNames { get; }
+        public char PermissionToCheck { get; }
+    }
+}