From cb18564275735da0614be39371e2e3e7f5467e88 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sun, 2 Feb 2020 14:35:30 +0800
Subject: Add timeline service.

---
 Timeline/Models/Validation/NameValidator.cs | 33 +++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 Timeline/Models/Validation/NameValidator.cs

(limited to 'Timeline/Models/Validation/NameValidator.cs')

diff --git a/Timeline/Models/Validation/NameValidator.cs b/Timeline/Models/Validation/NameValidator.cs
new file mode 100644
index 00000000..8db10ebd
--- /dev/null
+++ b/Timeline/Models/Validation/NameValidator.cs
@@ -0,0 +1,33 @@
+using System.Linq;
+using static Timeline.Resources.Models.Validation.NameValidator;
+
+namespace Timeline.Models.Validation
+{
+    public class NameValidator : Validator<string>
+    {
+        public const int MaxLength = 26;
+
+        protected override (bool, string) DoValidate(string value)
+        {
+            if (value.Length == 0)
+            {
+                return (false, MessageEmptyString);
+            }
+
+            if (value.Length > 26)
+            {
+                return (false, MessageTooLong);
+            }
+
+            foreach ((char c, int i) in value.Select((c, i) => (c, i)))
+            {
+                if (!(char.IsLetterOrDigit(c) || c == '-' || c == '_'))
+                {
+                    return (false, MessageInvalidChar);
+                }
+            }
+
+            return (true, GetSuccessMessage());
+        }
+    }
+}
-- 
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