From e7714754d8f59bb8dc29aeb6340380e93310175b Mon Sep 17 00:00:00 2001
From: 杨宇千 <crupest@outlook.com>
Date: Wed, 21 Aug 2019 23:55:42 +0800
Subject: Add validators.

---
 Timeline/Models/Validation/UserDetailValidator.cs | 113 +++++++++++++++++++++-
 1 file changed, 109 insertions(+), 4 deletions(-)

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

diff --git a/Timeline/Models/Validation/UserDetailValidator.cs b/Timeline/Models/Validation/UserDetailValidator.cs
index 5fdaec00..19c82edb 100644
--- a/Timeline/Models/Validation/UserDetailValidator.cs
+++ b/Timeline/Models/Validation/UserDetailValidator.cs
@@ -1,11 +1,116 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
+using System.Net.Mail;
 
 namespace Timeline.Models.Validation
 {
-    public class UserDetailValidator
+    public abstract class OptionalStringValidator : IValidator
     {
+        public bool Validate(object value, out string message)
+        {
+            if (value == null)
+            {
+                message = ValidationConstants.SuccessMessage;
+                return true;
+            }
+
+            if (value is string s)
+            {
+                if (s.Length == 0)
+                {
+                    message = ValidationConstants.SuccessMessage;
+                    return true;
+                }
+                return DoValidate(s, out message);
+            }
+            else
+            {
+                message = "Value is not of type string.";
+                return false;
+            }
+        }
+
+        protected abstract bool DoValidate(string value, out string message);
+    }
+
+    public static class UserDetailValidators
+    {
+
+        public class QQValidator : OptionalStringValidator
+        {
+            protected override bool DoValidate(string value, out string message)
+            {
+                if (value.Length < 5)
+                {
+                    message = "QQ is too short.";
+                    return false;
+                }
+
+                if (value.Length > 11)
+                {
+                    message = "QQ is too long.";
+                    return false;
+                }
+
+                foreach (var c in value)
+                {
+                    if (!char.IsDigit(c))
+                    {
+                        message = "QQ must only contain digit.";
+                        return false;
+                    }
+                }
+
+                message = ValidationConstants.SuccessMessage;
+                return true;
+            }
+        }
+
+        public class EMailValidator : OptionalStringValidator
+        {
+            protected override bool DoValidate(string value, out string message)
+            {
+                if (value.Length > 50)
+                {
+                    message = "E-Mail is too long.";
+                    return false;
+                }
+
+                try
+                {
+                    var _ = new MailAddress(value);
+                }
+                catch (FormatException)
+                {
+                    message = "The format of E-Mail is bad.";
+                    return false;
+                }
+                message = ValidationConstants.SuccessMessage;
+                return true;
+            }
+        }
+
+        public class PhoneNumberValidator : OptionalStringValidator
+        {
+            protected override bool DoValidate(string value, out string message)
+            {
+                if (value.Length > 14)
+                {
+                    message = "Phone number is too long.";
+                    return false;
+                }
+
+                foreach (var c in value)
+                {
+                    if (!char.IsDigit(c))
+                    {
+                        message = "Phone number can only contain digit.";
+                        return false;
+                    }
+                }
+
+                message = ValidationConstants.SuccessMessage;
+                return true;
+            }
+        }
     }
 }
-- 
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