From 3ddb38839ac07de4edf071faeb753b62acb0bed1 Mon Sep 17 00:00:00 2001
From: 杨宇千 <crupest@outlook.com>
Date: Tue, 22 Oct 2019 20:49:52 +0800
Subject: ...

---
 Timeline/Models/Validation/UsernameValidator.cs    |  37 +++---
 Timeline/Models/Validation/Validator.cs            |  58 ++++-----
 .../Validation/UsernameValidator.Designer.cs       |  90 ++++++++++++++
 .../Models/Validation/UsernameValidator.en.resx    | 129 +++++++++++++++++++++
 .../Models/Validation/UsernameValidator.resx       | 129 +++++++++++++++++++++
 .../Models/Validation/UsernameValidator.zh.resx    | 129 +++++++++++++++++++++
 .../Models/Validation/Validator.Designer.cs        |  27 +++++
 .../Resources/Models/Validation/Validator.resx     |   9 ++
 Timeline/Services/UserService.cs                   |  18 +--
 Timeline/Timeline.csproj                           |  12 ++
 10 files changed, 580 insertions(+), 58 deletions(-)
 create mode 100644 Timeline/Resources/Models/Validation/UsernameValidator.Designer.cs
 create mode 100644 Timeline/Resources/Models/Validation/UsernameValidator.en.resx
 create mode 100644 Timeline/Resources/Models/Validation/UsernameValidator.resx
 create mode 100644 Timeline/Resources/Models/Validation/UsernameValidator.zh.resx

(limited to 'Timeline')

diff --git a/Timeline/Models/Validation/UsernameValidator.cs b/Timeline/Models/Validation/UsernameValidator.cs
index ecc3b5b3..65d4da71 100644
--- a/Timeline/Models/Validation/UsernameValidator.cs
+++ b/Timeline/Models/Validation/UsernameValidator.cs
@@ -1,46 +1,39 @@
-using Microsoft.Extensions.Localization;
-using System.Linq;
-using System.Text.RegularExpressions;
+using System.Linq;
 
 namespace Timeline.Models.Validation
 {
     public class UsernameValidator : Validator<string>
     {
         public const int MaxLength = 26;
-        public const string RegexPattern = @"^[a-zA-Z0-9_][a-zA-Z0-9-_]*$";
 
-        private readonly Regex _regex = new Regex(RegexPattern);
-
-        protected override bool DoValidate(string value, IStringLocalizerFactory localizerFactory, out string message)
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "CA1062:Validate arguments of public methods", Justification = "Already checked in base class.")]
+        protected override (bool, ValidationMessageGenerator) DoValidate(string value)
         {
             if (value.Length == 0)
             {
-                message = "An empty string is not permitted.";
-                return false;
+                return (false, factory =>
+                    factory?.Create(typeof(UsernameValidator))?["ValidationMessageEmptyString"]
+                    ?? Resources.Models.Validation.UsernameValidator.InvariantValidationMessageEmptyString);
             }
 
             if (value.Length > 26)
             {
-                message = $"Too long, more than 26 characters is not premitted, found {value.Length}.";
-                return false;
+                return (false, factory =>
+                    factory?.Create(typeof(UsernameValidator))?["ValidationMessageTooLong"]
+                    ?? Resources.Models.Validation.UsernameValidator.InvariantValidationMessageTooLong);
             }
 
             foreach ((char c, int i) in value.Select((c, i) => (c, i)))
-                if (char.IsWhiteSpace(c))
+            {
+                if (!(char.IsLetterOrDigit(c) || c == '-' || c == '_'))
                 {
-                    message = $"A whitespace is found at {i} . Whitespace is not permited.";
-                    return false;
+                    return (false, factory =>
+                        factory?.Create(typeof(UsernameValidator))?["ValidationMessageInvalidChar"]
+                        ?? Resources.Models.Validation.UsernameValidator.InvariantValidationMessageInvalidChar);
                 }
-
-            var match = _regex.Match(value);
-            if (!match.Success)
-            {
-                message = "Regex match failed.";
-                return false;
             }
 
-            message = ValidationConstants.SuccessMessage;
-            return true;
+            return (true, SuccessMessageGenerator);
         }
     }
 }
diff --git a/Timeline/Models/Validation/Validator.cs b/Timeline/Models/Validation/Validator.cs
index a3800b71..606ba7b4 100644
--- a/Timeline/Models/Validation/Validator.cs
+++ b/Timeline/Models/Validation/Validator.cs
@@ -6,9 +6,16 @@ using Timeline.Helpers;
 
 namespace Timeline.Models.Validation
 {
+    /// <summary>
+    /// Generate a message from a localizer factory.
+    /// If localizerFactory is null, it should return a neutral-cultural message.
+    /// </summary>
+    /// <param name="localizerFactory">The localizer factory. Could be null.</param>
+    /// <returns>The message.</returns>
+    public delegate string ValidationMessageGenerator(IStringLocalizerFactory? localizerFactory);
+
     /// <summary>
     /// A validator to validate value.
-    /// See <see cref="Validate(object?, out string)"/>.
     /// </summary>
     public interface IValidator
     {
@@ -16,14 +23,8 @@ namespace Timeline.Models.Validation
         /// Validate given value.
         /// </summary>
         /// <param name="value">The value to validate.</param>
-        /// <param name="message">The validation message.</param>
-        /// <returns>True if validation passed. Otherwise false.</returns>
-        bool Validate(object? value, IStringLocalizerFactory localizerFactory, out string message);
-    }
-
-    public static class ValidationConstants
-    {
-        public const string SuccessMessage = "Validation succeeded.";
+        /// <returns>Validation success or not and the message generator.</returns>
+        (bool, ValidationMessageGenerator) Validate(object? value);
     }
 
     /// <summary>
@@ -39,36 +40,32 @@ namespace Timeline.Models.Validation
     /// </remarks>
     public abstract class Validator<T> : IValidator
     {
-        [System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "CA1062:Validate arguments of public methods", Justification = "<Pending>")]
-        public bool Validate(object? value, IStringLocalizerFactory localizerFactory, out string message)
+        public (bool, ValidationMessageGenerator) Validate(object? value)
         {
             if (value == null)
             {
-                var localizer = localizerFactory.Create("Models.Validation.Validator");
-                message = localizer["ValidatorMessageNull"];
-                return false;
+                return (false, factory =>
+                    factory?.Create("Models.Validation.Validator")?["ValidatorMessageNull"]
+                    ?? Resources.Models.Validation.Validator.InvariantValidatorMessageNull
+                );
             }
 
             if (value is T v)
             {
-                return DoValidate(v, localizerFactory, out message);
+                return DoValidate(v);
             }
             else
             {
-                var localizer = localizerFactory.Create("Models.Validation.Validator");
-                message = localizer["ValidatorMessageBadType", typeof(T).FullName];
-                return false;
+                return (false, factory =>
+                    factory?.Create("Models.Validation.Validator")?["ValidatorMessageBadType", typeof(T).FullName]
+                    ?? Resources.Models.Validation.Validator.InvariantValidatorMessageBadType);
             }
         }
 
-        [System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "CA1062:Validate arguments of public methods")]
-        protected static string GetSuccessMessage(IStringLocalizerFactory factory)
-        {
-            var localizer = factory.Create("Models.Validation.Validator");
-            return localizer["ValidatorMessageSuccess"];
-        }
+        protected static ValidationMessageGenerator SuccessMessageGenerator { get; } = factory =>
+            factory?.Create("Models.Validation.Validator")?["ValidatorMessageSuccess"] ?? Resources.Models.Validation.Validator.InvariantValidatorMessageSuccess;
 
-        protected abstract bool DoValidate(T value, IStringLocalizerFactory localizerFactory, out string message);
+        protected abstract (bool, ValidationMessageGenerator) DoValidate(T value);
     }
 
     [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter,
@@ -113,11 +110,16 @@ namespace Timeline.Models.Validation
 
         protected override ValidationResult IsValid(object value, ValidationContext validationContext)
         {
-            var localizerFactory = validationContext.GetRequiredService<IStringLocalizerFactory>();
-            if (_validator.Validate(value, localizerFactory, out var message))
+            var (result, messageGenerator) = _validator.Validate(value);
+            if (result)
+            {
                 return ValidationResult.Success;
+            }
             else
-                return new ValidationResult(message);
+            {
+                var localizerFactory = validationContext.GetRequiredService<IStringLocalizerFactory>();
+                return new ValidationResult(messageGenerator(localizerFactory));
+            }
         }
     }
 }
diff --git a/Timeline/Resources/Models/Validation/UsernameValidator.Designer.cs b/Timeline/Resources/Models/Validation/UsernameValidator.Designer.cs
new file mode 100644
index 00000000..a4c35326
--- /dev/null
+++ b/Timeline/Resources/Models/Validation/UsernameValidator.Designer.cs
@@ -0,0 +1,90 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace Timeline.Resources.Models.Validation {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "16.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class UsernameValidator {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal UsernameValidator() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("Timeline.Resources.Models.Validation.UsernameValidator", typeof(UsernameValidator).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to An empty string is not allowed..
+        /// </summary>
+        internal static string InvariantValidationMessageEmptyString {
+            get {
+                return ResourceManager.GetString("InvariantValidationMessageEmptyString", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Invalid character, only alphabet, digit, underscore and hyphen are allowed. .
+        /// </summary>
+        internal static string InvariantValidationMessageInvalidChar {
+            get {
+                return ResourceManager.GetString("InvariantValidationMessageInvalidChar", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Too long, more than 26 characters is not premitted..
+        /// </summary>
+        internal static string InvariantValidationMessageTooLong {
+            get {
+                return ResourceManager.GetString("InvariantValidationMessageTooLong", resourceCulture);
+            }
+        }
+    }
+}
diff --git a/Timeline/Resources/Models/Validation/UsernameValidator.en.resx b/Timeline/Resources/Models/Validation/UsernameValidator.en.resx
new file mode 100644
index 00000000..9171b856
--- /dev/null
+++ b/Timeline/Resources/Models/Validation/UsernameValidator.en.resx
@@ -0,0 +1,129 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="ValidationMessageEmptyString" xml:space="preserve">
+    <value>An empty string is not allowed.</value>
+  </data>
+  <data name="ValidationMessageInvalidChar" xml:space="preserve">
+    <value>Invalid character, only alphabet, digit, underscore and hyphen are allowed.</value>
+  </data>
+  <data name="ValidationMessageTooLong" xml:space="preserve">
+    <value>Too long, more than 26 characters is not premitted.</value>
+  </data>
+</root>
\ No newline at end of file
diff --git a/Timeline/Resources/Models/Validation/UsernameValidator.resx b/Timeline/Resources/Models/Validation/UsernameValidator.resx
new file mode 100644
index 00000000..80cae2d5
--- /dev/null
+++ b/Timeline/Resources/Models/Validation/UsernameValidator.resx
@@ -0,0 +1,129 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="InvariantValidationMessageEmptyString" xml:space="preserve">
+    <value>An empty string is not allowed.</value>
+  </data>
+  <data name="InvariantValidationMessageInvalidChar" xml:space="preserve">
+    <value>Invalid character, only alphabet, digit, underscore and hyphen are allowed. </value>
+  </data>
+  <data name="InvariantValidationMessageTooLong" xml:space="preserve">
+    <value>Too long, more than 26 characters is not premitted.</value>
+  </data>
+</root>
\ No newline at end of file
diff --git a/Timeline/Resources/Models/Validation/UsernameValidator.zh.resx b/Timeline/Resources/Models/Validation/UsernameValidator.zh.resx
new file mode 100644
index 00000000..1c8a936c
--- /dev/null
+++ b/Timeline/Resources/Models/Validation/UsernameValidator.zh.resx
@@ -0,0 +1,129 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="ValidationMessageEmptyString" xml:space="preserve">
+    <value>空字符串是不允许的。</value>
+  </data>
+  <data name="ValidationMessageInvalidChar" xml:space="preserve">
+    <value>无效的字符，只能使用字母、数字、下划线和连字符。</value>
+  </data>
+  <data name="ValidationMessageTooLong" xml:space="preserve">
+    <value>太长了，不能大于26个字符。</value>
+  </data>
+</root>
\ No newline at end of file
diff --git a/Timeline/Resources/Models/Validation/Validator.Designer.cs b/Timeline/Resources/Models/Validation/Validator.Designer.cs
index f2532af3..4cbc13de 100644
--- a/Timeline/Resources/Models/Validation/Validator.Designer.cs
+++ b/Timeline/Resources/Models/Validation/Validator.Designer.cs
@@ -60,6 +60,33 @@ namespace Timeline.Resources.Models.Validation {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Value is not of type {0}..
+        /// </summary>
+        internal static string InvariantValidatorMessageBadType {
+            get {
+                return ResourceManager.GetString("InvariantValidatorMessageBadType", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Value can&apos;t be null..
+        /// </summary>
+        internal static string InvariantValidatorMessageNull {
+            get {
+                return ResourceManager.GetString("InvariantValidatorMessageNull", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Validation succeeded..
+        /// </summary>
+        internal static string InvariantValidatorMessageSuccess {
+            get {
+                return ResourceManager.GetString("InvariantValidatorMessageSuccess", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Failed to create a validator instance from default constructor. See inner exception..
         /// </summary>
diff --git a/Timeline/Resources/Models/Validation/Validator.resx b/Timeline/Resources/Models/Validation/Validator.resx
index 8843dc42..0e8f53a6 100644
--- a/Timeline/Resources/Models/Validation/Validator.resx
+++ b/Timeline/Resources/Models/Validation/Validator.resx
@@ -117,6 +117,15 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
+  <data name="InvariantValidatorMessageBadType" xml:space="preserve">
+    <value>Value is not of type {0}.</value>
+  </data>
+  <data name="InvariantValidatorMessageNull" xml:space="preserve">
+    <value>Value can't be null.</value>
+  </data>
+  <data name="InvariantValidatorMessageSuccess" xml:space="preserve">
+    <value>Validation succeeded.</value>
+  </data>
   <data name="ValidateWithAttributeCreateFail" xml:space="preserve">
     <value>Failed to create a validator instance from default constructor. See inner exception.</value>
   </data>
diff --git a/Timeline/Services/UserService.cs b/Timeline/Services/UserService.cs
index aad4a806..45ef8a5c 100644
--- a/Timeline/Services/UserService.cs
+++ b/Timeline/Services/UserService.cs
@@ -140,16 +140,13 @@ namespace Timeline.Services
 
         private readonly UsernameValidator _usernameValidator;
 
-        private readonly IStringLocalizerFactory _localizerFactory;
-
-        public UserService(ILogger<UserService> logger, IMemoryCache memoryCache, IStringLocalizerFactory localizerFactory, DatabaseContext databaseContext, IJwtService jwtService, IPasswordService passwordService)
+        public UserService(ILogger<UserService> logger, IMemoryCache memoryCache, DatabaseContext databaseContext, IJwtService jwtService, IPasswordService passwordService)
         {
             _logger = logger;
             _memoryCache = memoryCache;
             _databaseContext = databaseContext;
             _jwtService = jwtService;
             _passwordService = passwordService;
-            _localizerFactory = localizerFactory;
 
             _usernameValidator = new UsernameValidator();
         }
@@ -244,9 +241,10 @@ namespace Timeline.Services
             if (password == null)
                 throw new ArgumentNullException(nameof(password));
 
-            if (!_usernameValidator.Validate(username, _localizerFactory, out var message))
+            var (result, messageGenerator) = _usernameValidator.Validate(username);
+            if (!result)
             {
-                throw new UsernameBadFormatException(username, message);
+                throw new UsernameBadFormatException(username, messageGenerator(null));
             }
 
             var user = await _databaseContext.Users.Where(u => u.Name == username).SingleOrDefaultAsync();
@@ -353,8 +351,12 @@ namespace Timeline.Services
             if (string.IsNullOrEmpty(newUsername))
                 throw new ArgumentException("New username is null or empty", nameof(newUsername));
 
-            if (!_usernameValidator.Validate(newUsername, _localizerFactory, out var message))
-                throw new UsernameBadFormatException(newUsername, $"New username is of bad format. {message}");
+
+            var (result, messageGenerator) = _usernameValidator.Validate(newUsername);
+            if (!result)
+            {
+                throw new UsernameBadFormatException(newUsername, $"New username is of bad format. {messageGenerator(null)}");
+            }
 
             var user = await _databaseContext.Users.Where(u => u.Name == oldUsername).SingleOrDefaultAsync();
             if (user == null)
diff --git a/Timeline/Timeline.csproj b/Timeline/Timeline.csproj
index d1f9b2ed..e29c4e4b 100644
--- a/Timeline/Timeline.csproj
+++ b/Timeline/Timeline.csproj
@@ -49,6 +49,11 @@
         <AutoGen>True</AutoGen>
         <DependentUpon>UserController.resx</DependentUpon>
       </Compile>
+      <Compile Update="Resources\Models\Validation\UsernameValidator.Designer.cs">
+        <DesignTime>True</DesignTime>
+        <AutoGen>True</AutoGen>
+        <DependentUpon>UsernameValidator.resx</DependentUpon>
+      </Compile>
       <Compile Update="Resources\Models\Validation\Validator.Designer.cs">
         <DesignTime>True</DesignTime>
         <AutoGen>True</AutoGen>
@@ -82,6 +87,13 @@
         <Generator>ResXFileCodeGenerator</Generator>
         <LastGenOutput>UserController.Designer.cs</LastGenOutput>
       </EmbeddedResource>
+      <EmbeddedResource Update="Resources\Models\Validation\UsernameValidator.resx">
+        <Generator>ResXFileCodeGenerator</Generator>
+        <LastGenOutput>UsernameValidator.Designer.cs</LastGenOutput>
+      </EmbeddedResource>
+      <EmbeddedResource Update="Resources\Models\Validation\Validator.en.resx">
+        <Generator></Generator>
+      </EmbeddedResource>
       <EmbeddedResource Update="Resources\Models\Validation\Validator.resx">
         <Generator>ResXFileCodeGenerator</Generator>
         <LastGenOutput>Validator.Designer.cs</LastGenOutput>
-- 
cgit v1.2.3