1 files changed, 26 insertions, 0 deletions
diff --git a/Timeline/Models/Validation/NicknameValidator.cs b/Timeline/Models/Validation/NicknameValidator.cs
new file mode 100644
index 00000000..f6626a2a
--- /dev/null
+++ b/Timeline/Models/Validation/NicknameValidator.cs
@@ -0,0 +1,26 @@
+using System;
+using static Timeline.Resources.Models.Validation.NicknameValidator;
+
+namespace Timeline.Models.Validation
+{
+    public class NicknameValidator : Validator<string>
+    {
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "CA1062:Validate arguments of public methods", Justification = "Already checked in base.")]
+        protected override (bool, string) DoValidate(string value)
+        {
+            if (value.Length > 10)
+                return (false, MessageTooLong);
+
+            return (true, GetSuccessMessage());
+        }
+    }
+
+    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
+    public class NicknameAttribute : ValidateWithAttribute
+    {
+        public NicknameAttribute() : base(typeof(NicknameValidator))
+        {
+
+        }
+    }
+}