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ServerCommon/Helper/StringRuleHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+
+using Google.Protobuf.WellKnownTypes;
+
+
+using ServerCore;
+using ServerBase;
+
+
+namespace ServerCommon;
+
+public static class StringRuleHelper
+{
+    public static ServerErrorCode isValidNickname(string nickName)
+    {
+        ArgumentNullReferenceCheckHelper.throwIfNull(nickName, () => $"stringValue is null");
+
+        // 첫번째 글자가 숫자인지 체크 한다.
+        if (Regex.IsMatch(nickName[0].ToString(), "[0-9]") == true)
+        {
+            return ServerErrorCode.UserNicknameNotAllowedNumberAtFirstChars;
+        }
+
+        // 특수문자가 포함되어 있는지 체크 한다.
+        if (true == nickName.isContainSpecialChars(out _))
+        {
+            return ServerErrorCode.UserNicknameNotAllowWithSpecialChars;
+        }
+
+        // 길이 체크
+        if ( nickName.Length < MetaHelper.GameConfigMeta.UserNicknameMinLength ||
+             nickName.Length > MetaHelper.GameConfigMeta.UserNicknameMaxLength )
+        {
+            return ServerErrorCode.UserNicknameAllowedMin2ToMax12;
+        }
+
+        // 금지어 여부를 체크 한다.
+        if (StringRuleHelper.isBanNickname(nickName) == true)
+        {
+            Log.getLogger().info($"User Nickname is Ban !!! : nickname:{nickName}");
+            return ServerErrorCode.UserNicknameBan;
+        }
+
+        return ServerErrorCode.Success;
+    }
+
+    public static string convertStringFromBase64(string stringValue)
+    {
+        ArgumentNullReferenceCheckHelper.throwIfNull(stringValue, () => $"stringValue is null");
+
+        string decoded_text = string.Empty;
+        try
+        {
+            byte[] byteArray = Convert.FromBase64String(stringValue);
+            decoded_text = Encoding.UTF8.GetString(byteArray);
+        }
+        catch (Exception e)
+        {
+            Log.getLogger().error($"convertStringFromBase64 exception occured {e.StackTrace}");
+        }
+
+        return decoded_text;
+    }
+
+    public static string getString(LanguageType langType, List<OperationSystemMessage> systemMessage)
+    {
+        ArgumentNullReferenceCheckHelper.throwIfNull(systemMessage, () => $"systemMessage is null");
+
+        string txt = string.Empty;
+        foreach (var msg in systemMessage)
+        {
+            if ((int)msg.LanguageType == (int)langType)
+            {
+                //var base64_string  = StringRuleHelper.convertStringFromBase64(msg.Text);
+                txt = msg.Text;
+                break;
+            }
+        }
+
+        return txt;
+    }
+
+    public static bool isBanWord(string word, bool includeNickname)
+    {
+        var lowered_word = word.ToLower();
+
+        if (MetaData.Instance._BanWordMetaTable.Any(banWord => lowered_word.Contains(banWord) == true))
+        {
+            return true;
+        }
+
+        return includeNickname && isBanNickname(word);
+    }
+
+    private static bool isBanNickname(string word)
+    {
+        var lowered_word = word.ToLower();
+
+        return MetaData.Instance._BanWordNicknameMetaTable.Any(banNickNameWord => lowered_word.Contains(banNickNameWord) == true);
+    }
+}