From ac769e656b122ff569c3f1534701b71e00fed586 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 27 Oct 2020 19:21:35 +0800
Subject: Split front and back end.

---
 .../Timeline/Models/Validation/NameValidator.cs    | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 BackEnd/Timeline/Models/Validation/NameValidator.cs

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

diff --git a/BackEnd/Timeline/Models/Validation/NameValidator.cs b/BackEnd/Timeline/Models/Validation/NameValidator.cs
new file mode 100644
index 00000000..b74c40b7
--- /dev/null
+++ b/BackEnd/Timeline/Models/Validation/NameValidator.cs
@@ -0,0 +1,42 @@
+using System.Linq;
+using System.Text.RegularExpressions;
+using static Timeline.Resources.Models.Validation.NameValidator;
+
+namespace Timeline.Models.Validation
+{
+    public class NameValidator : Validator<string>
+    {
+        private static Regex UniqueIdRegex { get; } = new Regex(@"^[a-zA-Z0-9]{32}$");
+
+        public const int MaxLength = 26;
+
+        protected override (bool, string) DoValidate(string value)
+        {
+            if (value.Length == 0)
+            {
+                return (false, MessageEmptyString);
+            }
+
+            if (value.Length > MaxLength)
+            {
+                return (false, MessageTooLong);
+            }
+
+            foreach ((char c, int i) in value.Select((c, i) => (c, i)))
+            {
+                if (!(char.IsLetterOrDigit(c) || c == '-' || c == '_'))
+                {
+                    return (false, MessageInvalidChar);
+                }
+            }
+
+            // Currently name can't be longer than 26. So this is not needed. But reserve it for future use.
+            if (UniqueIdRegex.IsMatch(value))
+            {
+                return (false, MessageUnqiueId);
+            }
+
+            return (true, GetSuccessMessage());
+        }
+    }
+}
-- 
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