Radicade/Server/Utils/StringTools.cs

using System.Text;
using RadicadeServer.RecNet.Enums;
using RadicadeServer.RecNet;
using System.Buffers.Text;
using System.Security.Cryptography;
using System.Text.RegularExpressions;

namespace RadicadeServer.Utils
{
	public static class StringTools
	{
		public static string AltGuid(this Guid guid)
		{
			return guid.ToString().Replace("-", "");
		}

		public static string FromAES(this string encrypted, string? b64Key, string? b64IV)
		{
			if (string.IsNullOrEmpty(b64Key)) return "";
			if (string.IsNullOrEmpty(b64IV)) return "";

			try
			{
				byte[] cipherBytes = Convert.FromBase64String(encrypted);
				byte[] keyBytes = Convert.FromBase64String(b64Key);
				byte[] ivBytes = Convert.FromBase64String(b64IV);

				using (Aes aes = Aes.Create())
				{
					aes.KeySize = 128;
					aes.BlockSize = 128;
					aes.Key = keyBytes;
					aes.IV = ivBytes;
					aes.Mode = CipherMode.CBC;
					aes.Padding = PaddingMode.PKCS7;

					using (MemoryStream ms = new MemoryStream(cipherBytes))
					using (CryptoStream cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Read))
					using (StreamReader sr = new StreamReader(cs, Encoding.UTF8))
					{
						return sr.ReadToEnd();
					}
				}
			} catch
			{
				return "";
			}
		}

		public static List<CardBoxWord> ParseCardBoxWords(this string req)
		{
			var split = req.Split(';', StringSplitOptions.TrimEntries);
			var words = new List<CardBoxWord>();

			foreach (var word in split)
			{
				words.Add(new CardBoxWord { Difficulty = CardDifficulty.CharadesEasy, EN_US =  word });
			}

			return words;
		}

		public static string CreateTagString(List<ItemTag>? Tags)
		{
			if (Tags == null)
				return "";

			StringBuilder stringBuilder = new StringBuilder();
			foreach (ItemTag itemTag in Tags)
			{
				stringBuilder.Append(itemTag.Tag.ToString() + "," + ((int)itemTag.Type).ToString() + "|");
			}
			return stringBuilder.ToString().TrimEnd('|');
		}

		public static string CreateTagString(string[]? Tags)
		{
			if (Tags == null)
				return "";

			StringBuilder stringBuilder = new StringBuilder();
			foreach (string itemTag in Tags)
			{
				stringBuilder.Append(itemTag.ToString() + "," + ((int)TagType.General).ToString() + "|");
			}
			return stringBuilder.ToString().TrimEnd('|');
		}

		public static List<ItemTag> ReadTags(string Tags)
		{
			List<ItemTag> list = new List<ItemTag>();
			if (string.IsNullOrWhiteSpace(Tags)) return list;
			string[] tags = Tags.Split("|", StringSplitOptions.None);
			foreach (string text in tags)
			{
				string[] array3 = text.Split(",", StringSplitOptions.None);
				if (array3.Length != 2) continue;
				if (!int.TryParse(array3[1], out var typeValue) || !Enum.IsDefined(typeof(TagType), typeValue))
					continue;
				list.Add(new ItemTag
				{
					Tag = array3[0],
					Type = (TagType)typeValue
				});
			}
			return list;
		}

		public static List<string> TagsToStrings(List<ItemTag> Tags)
		{
			List<string> list = new List<string>();
			foreach (var tag in Tags)
			{
				list.Add(tag.Tag);
			}
			return list;
		}

		public static string ToBase64(this string str)
		{
			var bytes = System.Text.Encoding.UTF8.GetBytes(str);
			var b64 = Convert.ToBase64String(bytes);
			return b64;
		}


		private static string[] BlacklistedWords = {
			"nigger",
			"nigga",
			"faggot",
			"fag",
			"nigg",
			};
		private static string[] BlacklistedTags = {
			"rro",
			"featured"
			};

		public static string Sanitize(this string str)
		{
			foreach (var tag in BlacklistedWords)
			{
				str = Regex.Replace(str, tag, "****", RegexOptions.IgnoreCase);
			}
			return str;
		}
		public static bool IsPure(this string str)
		{
			if (string.IsNullOrEmpty(str)) return true;

			foreach (var tag in BlacklistedWords)
		{
				if (Regex.IsMatch(str, tag, RegexOptions.IgnoreCase))
					return false;
			}
			return true;
		}
		public static bool TagAllowed(this string str)
		{
			foreach (var tag in BlacklistedTags) {
				if (Regex.IsMatch(tag, str))
					return false;
			}
			return str.IsPure();
		}
	}
}