1 files changed, 40 insertions, 0 deletions
diff --git a/BackEnd/Timeline/Models/Validation/StringSetValidator.cs b/BackEnd/Timeline/Models/Validation/StringSetValidator.cs
new file mode 100644
index 00000000..363ece10
--- /dev/null
+++ b/BackEnd/Timeline/Models/Validation/StringSetValidator.cs
@@ -0,0 +1,40 @@
+using System;
+using System.Linq;
+
+namespace Timeline.Models.Validation
+{
+    public class StringSetValidator : Validator<string>
+    {
+        public StringSetValidator(params string[] set)
+        {
+            Set = set;
+        }
+
+#pragma warning disable CA1819 // Properties should not return arrays
+        public string[] Set { get; set; }
+#pragma warning restore CA1819 // Properties should not return arrays
+
+        protected override (bool, string) DoValidate(string value)
+        {
+            var contains = Set.Contains(value, StringComparer.OrdinalIgnoreCase);
+            if (!contains)
+            {
+                return (false, "Not a valid value.");
+            }
+            else
+            {
+                return (true, GetSuccessMessage());
+            }
+        }
+    }
+
+    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter,
+    AllowMultiple = false)]
+    public class ValidationSetAttribute : ValidateWithAttribute
+    {
+        public ValidationSetAttribute(params string[] set) : base(new StringSetValidator(set))
+        {
+
+        }
+    }
+}