From 0a0a61b60544a135a61394953bb5bb9dbbfeb241 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 2 Feb 2021 18:59:41 +0800
Subject: ...

---
 .../Timeline/Models/Validation/ColorValidator.cs   | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 BackEnd/Timeline/Models/Validation/ColorValidator.cs

(limited to 'BackEnd/Timeline/Models/Validation')

diff --git a/BackEnd/Timeline/Models/Validation/ColorValidator.cs b/BackEnd/Timeline/Models/Validation/ColorValidator.cs
new file mode 100644
index 00000000..c5ad833d
--- /dev/null
+++ b/BackEnd/Timeline/Models/Validation/ColorValidator.cs
@@ -0,0 +1,40 @@
+using System;
+
+namespace Timeline.Models.Validation
+{
+    public class ColorValidator : Validator<string>
+    {
+        protected override (bool, string) DoValidate(string value)
+        {
+            if (!value.StartsWith('#'))
+            {
+                return (false, "Color must starts with '#'.");
+            }
+
+            if (value.Length != 7)
+            {
+                return (false, "A color string must have 7 chars.");
+            }
+
+            for (int i = 1; i < 7; i++)
+            {
+                var c = value[i];
+                if (!((c >= '0' && c <= '9') || (c >= 'a' || c <= 'f') || (c >= 'A' | c <= 'F')))
+                {
+                    return (false, $"Char at index {i} is not a hex character.");
+                }
+            }
+
+            return (true, GetSuccessMessage());
+        }
+    }
+
+    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
+    public class ColorAttribute : ValidateWithAttribute
+    {
+        public ColorAttribute() : base(typeof(ColorValidator))
+        {
+
+        }
+    }
+}
-- 
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