Rename WebApi activity filters to ticket filters

Legacy/F4SDM42WebApi/TicketFilterService.cs

@@ -0,0 +1,63 @@
+using System.Collections.Generic;
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+using C4IT.FASD.Base;
+using C4IT.Logging;
+
+using static C4IT.Logging.cLogManager;
+
+namespace C4IT.F4SD
+{
+    public partial class F4SDHelperService
+    {
+        private static readonly AsyncLocal<cTicketFilterPolicy> currentTicketFilters =
+            new AsyncLocal<cTicketFilterPolicy>();
+
+        private sealed class TicketFilterScope : IDisposable
+        {
+            private readonly cTicketFilterPolicy previous;
+
+            public TicketFilterScope(cTicketFilterPolicy filters)
+            {
+                previous = currentTicketFilters.Value;
+                currentTicketFilters.Value = filters;
+            }
+
+            public void Dispose()
+            {
+                currentTicketFilters.Value = previous;
+            }
+        }
+
+        internal IDisposable BeginTicketFilterScope(cTicketFilterPolicy filters)
+        {
+            return new TicketFilterScope(filters);
+        }
+
+        internal async Task<string> ApplyTicketFiltersAsync(string baseFilter, cTicketFilterPolicy policy)
+        {
+            var result = await TicketFilterCompiler.CompileAsync(policy ?? currentTicketFilters.Value, null);
+            if (!result.Success)
+            {
+                LogEntry($"Ticket filter rejected (fail closed): {result.Error}", LogLevels.Error);
+                return null;
+            }
+
+            return string.IsNullOrWhiteSpace(result.Clause)
+                ? baseFilter
+                : $"({baseFilter}) AND ({result.Clause})";
+        }
+
+        internal cTicketFilterCapabilities GetTicketFilterCapabilities()
+        {
+            return new cTicketFilterCapabilities
+            {
+                Provider = TicketFilterCompiler.ProviderName,
+                CommonFields = new List<string> { TicketFilterCompiler.AssignmentGroupField },
+                ProviderFields = new List<string> { TicketFilterCompiler.QueueField }
+            };
+        }
+    }
+}