1204 lines
46 KiB
C#
1204 lines
46 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Diagnostics.CodeAnalysis;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.RegularExpressions;
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namespace Umbraco.Core
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{
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///<summary>
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/// String extension methods
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///</summary>
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public static class StringExtensions
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{
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private static readonly char[] ToCSharpHexDigitLower = "0123456789abcdef".ToCharArray();
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private static readonly char[] ToCSharpEscapeChars;
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static StringExtensions()
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{
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var escapes = new[] { "\aa", "\bb", "\ff", "\nn", "\rr", "\tt", "\vv", "\"\"", "\\\\", "??", "\00" };
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ToCSharpEscapeChars = new char[escapes.Max(e => e[0]) + 1];
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foreach (var escape in escapes)
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ToCSharpEscapeChars[escape[0]] = escape[1];
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}
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/// <summary>
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/// Convert a path to node ids in the order from right to left (deepest to shallowest)
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/// </summary>
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/// <param name="path"></param>
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/// <returns></returns>
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public static int[] GetIdsFromPathReversed(this string path)
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{
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var nodeIds = path.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries)
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.Select(x => x.TryConvertTo<int>())
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.Where(x => x.Success)
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.Select(x => x.Result)
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.Reverse()
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.ToArray();
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return nodeIds;
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}
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/// <summary>
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/// Removes new lines and tabs
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/// </summary>
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/// <param name="txt"></param>
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/// <returns></returns>
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public static string StripWhitespace(this string txt)
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{
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return Regex.Replace(txt, @"\s", string.Empty);
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}
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public static string StripFileExtension(this string fileName)
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{
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//filenames cannot contain line breaks
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if (fileName.Contains(Environment.NewLine) || fileName.Contains("\r") || fileName.Contains("\n")) return fileName;
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var lastIndex = fileName.LastIndexOf('.');
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if (lastIndex > 0)
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{
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var ext = fileName.Substring(lastIndex);
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//file extensions cannot contain whitespace
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if (ext.Contains(" ")) return fileName;
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return string.Format("{0}", fileName.Substring(0, fileName.IndexOf(ext, StringComparison.Ordinal)));
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}
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return fileName;
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}
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/// <summary>
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/// This tries to detect a json string, this is not a fail safe way but it is quicker than doing
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/// a try/catch when deserializing when it is not json.
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/// </summary>
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/// <param name="input"></param>
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/// <returns></returns>
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public static bool DetectIsJson(this string input)
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{
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if (input.IsNullOrWhiteSpace()) return false;
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input = input.Trim();
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return (input.StartsWith("{") && input.EndsWith("}"))
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|| (input.StartsWith("[") && input.EndsWith("]"));
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}
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internal static readonly Lazy<Regex> Whitespace = new Lazy<Regex>(() => new Regex(@"\s+", RegexOptions.Compiled));
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internal static readonly string[] JsonEmpties = { "[]", "{}" };
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public static bool DetectIsEmptyJson(this string input)
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{
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return JsonEmpties.Contains(Whitespace.Value.Replace(input, string.Empty));
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}
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public static string ReplaceNonAlphanumericChars(this string input, string replacement)
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{
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//any character that is not alphanumeric, convert to a hyphen
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var mName = input;
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foreach (var c in mName.ToCharArray().Where(c => !char.IsLetterOrDigit(c)))
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{
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mName = mName.Replace(c.ToString(CultureInfo.InvariantCulture), replacement);
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}
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return mName;
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}
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public static string ReplaceNonAlphanumericChars(this string input, char replacement)
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{
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var inputArray = input.ToCharArray();
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var outputArray = new char[input.Length];
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for (var i = 0; i < inputArray.Length; i++)
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outputArray[i] = char.IsLetterOrDigit(inputArray[i]) ? inputArray[i] : replacement;
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return new string(outputArray);
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}
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private static readonly char[] CleanForXssChars = "*?(){}[];:%<>/\\|&'\"".ToCharArray();
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/// <summary>
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/// Cleans string to aid in preventing xss attacks.
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/// </summary>
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/// <param name="input"></param>
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/// <param name="ignoreFromClean"></param>
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/// <returns></returns>
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public static string CleanForXss(this string input, params char[] ignoreFromClean)
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{
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//remove any HTML
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input = input.StripHtml();
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//strip out any potential chars involved with XSS
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return input.ExceptChars(new HashSet<char>(CleanForXssChars.Except(ignoreFromClean)));
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}
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public static string ExceptChars(this string str, HashSet<char> toExclude)
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{
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var sb = new StringBuilder(str.Length);
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foreach (var c in str.Where(c => toExclude.Contains(c) == false))
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{
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sb.Append(c);
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}
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return sb.ToString();
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}
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/// <summary>
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/// Returns a stream from a string
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/// </summary>
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/// <param name="s"></param>
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/// <returns></returns>
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internal static Stream GenerateStreamFromString(this string s)
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{
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var stream = new MemoryStream();
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var writer = new StreamWriter(stream);
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writer.Write(s);
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writer.Flush();
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stream.Position = 0;
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return stream;
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}
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/// <summary>
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/// This will append the query string to the URL
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/// </summary>
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/// <param name="url"></param>
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/// <param name="queryStrings"></param>
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/// <returns></returns>
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/// <remarks>
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/// This methods ensures that the resulting URL is structured correctly, that there's only one '?' and that things are
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/// delimited properly with '&'
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/// </remarks>
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internal static string AppendQueryStringToUrl(this string url, params string[] queryStrings)
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{
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//remove any prefixed '&' or '?'
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for (var i = 0; i < queryStrings.Length; i++)
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{
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queryStrings[i] = queryStrings[i].TrimStart('?', '&').TrimEnd('&');
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}
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var nonEmpty = queryStrings.Where(x => !x.IsNullOrWhiteSpace()).ToArray();
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if (url.Contains("?"))
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{
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return url + string.Join("&", nonEmpty).EnsureStartsWith('&');
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}
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return url + string.Join("&", nonEmpty).EnsureStartsWith('?');
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}
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//this is from SqlMetal and just makes it a bit of fun to allow pluralization
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public static string MakePluralName(this string name)
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{
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if ((name.EndsWith("x", StringComparison.OrdinalIgnoreCase) || name.EndsWith("ch", StringComparison.OrdinalIgnoreCase)) || (name.EndsWith("s", StringComparison.OrdinalIgnoreCase) || name.EndsWith("sh", StringComparison.OrdinalIgnoreCase)))
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{
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name = name + "es";
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return name;
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}
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if ((name.EndsWith("y", StringComparison.OrdinalIgnoreCase) && (name.Length > 1)) && !IsVowel(name[name.Length - 2]))
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{
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name = name.Remove(name.Length - 1, 1);
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name = name + "ies";
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return name;
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}
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if (!name.EndsWith("s", StringComparison.OrdinalIgnoreCase))
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{
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name = name + "s";
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}
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return name;
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}
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public static bool IsVowel(this char c)
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{
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switch (c)
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{
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case 'O':
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case 'U':
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case 'Y':
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case 'A':
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case 'E':
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case 'I':
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case 'o':
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case 'u':
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case 'y':
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case 'a':
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case 'e':
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case 'i':
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return true;
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}
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return false;
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}
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/// <summary>
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/// Trims the specified value from a string; accepts a string input whereas the in-built implementation only accepts char or char[].
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/// </summary>
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/// <param name="value">The value.</param>
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/// <param name="forRemoving">For removing.</param>
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/// <returns></returns>
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public static string Trim(this string value, string forRemoving)
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{
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if (string.IsNullOrEmpty(value)) return value;
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return value.TrimEnd(forRemoving).TrimStart(forRemoving);
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}
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public static string EncodeJsString(this string s)
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{
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var sb = new StringBuilder();
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foreach (var c in s)
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{
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switch (c)
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{
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case '\"':
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sb.Append("\\\"");
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break;
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case '\\':
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sb.Append("\\\\");
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break;
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case '\b':
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sb.Append("\\b");
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break;
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case '\f':
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sb.Append("\\f");
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break;
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case '\n':
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sb.Append("\\n");
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break;
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case '\r':
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sb.Append("\\r");
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break;
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case '\t':
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sb.Append("\\t");
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break;
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default:
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int i = (int)c;
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if (i < 32 || i > 127)
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{
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sb.AppendFormat("\\u{0:X04}", i);
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}
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else
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{
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sb.Append(c);
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}
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break;
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}
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}
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return sb.ToString();
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}
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public static string TrimEnd(this string value, string forRemoving)
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{
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if (string.IsNullOrEmpty(value)) return value;
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if (string.IsNullOrEmpty(forRemoving)) return value;
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while (value.EndsWith(forRemoving, StringComparison.InvariantCultureIgnoreCase))
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{
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value = value.Remove(value.LastIndexOf(forRemoving, StringComparison.InvariantCultureIgnoreCase));
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}
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return value;
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}
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public static string TrimStart(this string value, string forRemoving)
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{
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if (string.IsNullOrEmpty(value)) return value;
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if (string.IsNullOrEmpty(forRemoving)) return value;
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while (value.StartsWith(forRemoving, StringComparison.InvariantCultureIgnoreCase))
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{
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value = value.Substring(forRemoving.Length);
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}
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return value;
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}
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public static string EnsureStartsWith(this string input, string toStartWith)
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{
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if (input.StartsWith(toStartWith)) return input;
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return toStartWith + input.TrimStart(toStartWith);
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}
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public static string EnsureStartsWith(this string input, char value)
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{
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return input.StartsWith(value.ToString(CultureInfo.InvariantCulture)) ? input : value + input;
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}
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public static string EnsureEndsWith(this string input, char value)
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{
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return input.EndsWith(value.ToString(CultureInfo.InvariantCulture)) ? input : input + value;
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}
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public static string EnsureEndsWith(this string input, string toEndWith)
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{
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return input.EndsWith(toEndWith.ToString(CultureInfo.InvariantCulture)) ? input : input + toEndWith;
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}
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public static bool IsLowerCase(this char ch)
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{
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return ch.ToString(CultureInfo.InvariantCulture) == ch.ToString(CultureInfo.InvariantCulture).ToLowerInvariant();
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}
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|||
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public static bool IsUpperCase(this char ch)
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{
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return ch.ToString(CultureInfo.InvariantCulture) == ch.ToString(CultureInfo.InvariantCulture).ToUpperInvariant();
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}
|
|||
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|
|||
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/// <summary>Indicates whether a specified string is null, empty, or
|
|||
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/// consists only of white-space characters.</summary>
|
|||
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|
/// <param name="value">The value to check.</param>
|
|||
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/// <returns>Returns <see langword="true"/> if the value is null,
|
|||
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/// empty, or consists only of white-space characters, otherwise
|
|||
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/// returns <see langword="false"/>.</returns>
|
|||
|
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public static bool IsNullOrWhiteSpace(this string value) => string.IsNullOrWhiteSpace(value);
|
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|
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|
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public static string IfNullOrWhiteSpace(this string str, string defaultValue)
|
|||
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{
|
|||
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return str.IsNullOrWhiteSpace() ? defaultValue : str;
|
|||
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}
|
|||
|
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|
|||
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/// <summary>The to delimited list.</summary>
|
|||
|
|
/// <param name="list">The list.</param>
|
|||
|
|
/// <param name="delimiter">The delimiter.</param>
|
|||
|
|
/// <returns>the list</returns>
|
|||
|
|
[SuppressMessage("Microsoft.Design", "CA1026:DefaultParametersShouldNotBeUsed", Justification = "By design")]
|
|||
|
|
public static IList<string> ToDelimitedList(this string list, string delimiter = ",")
|
|||
|
|
{
|
|||
|
|
var delimiters = new[] { delimiter };
|
|||
|
|
return !list.IsNullOrWhiteSpace()
|
|||
|
|
? list.Split(delimiters, StringSplitOptions.RemoveEmptyEntries)
|
|||
|
|
.Select(i => i.Trim())
|
|||
|
|
.ToList()
|
|||
|
|
: new List<string>();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>enum try parse.</summary>
|
|||
|
|
/// <param name="strType">The str type.</param>
|
|||
|
|
/// <param name="ignoreCase">The ignore case.</param>
|
|||
|
|
/// <param name="result">The result.</param>
|
|||
|
|
/// <typeparam name="T">The type</typeparam>
|
|||
|
|
/// <returns>The enum try parse.</returns>
|
|||
|
|
[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "By Design")]
|
|||
|
|
[SuppressMessage("Microsoft.Design", "CA1021:AvoidOutParameters", MessageId = "2#", Justification = "By Design")]
|
|||
|
|
public static bool EnumTryParse<T>(this string strType, bool ignoreCase, out T result)
|
|||
|
|
{
|
|||
|
|
try
|
|||
|
|
{
|
|||
|
|
result = (T)Enum.Parse(typeof(T), strType, ignoreCase);
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
catch
|
|||
|
|
{
|
|||
|
|
result = default(T);
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Parse string to Enum
|
|||
|
|
/// </summary>
|
|||
|
|
/// <typeparam name="T">The enum type</typeparam>
|
|||
|
|
/// <param name="strType">The string to parse</param>
|
|||
|
|
/// <param name="ignoreCase">The ignore case</param>
|
|||
|
|
/// <returns>The parsed enum</returns>
|
|||
|
|
[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "By Design")]
|
|||
|
|
[SuppressMessage("Microsoft.Design", "CA1021:AvoidOutParameters", MessageId = "2#", Justification = "By Design")]
|
|||
|
|
public static T EnumParse<T>(this string strType, bool ignoreCase)
|
|||
|
|
{
|
|||
|
|
return (T)Enum.Parse(typeof(T), strType, ignoreCase);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Strips all HTML from a string.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="text">The text.</param>
|
|||
|
|
/// <returns>Returns the string without any HTML tags.</returns>
|
|||
|
|
public static string StripHtml(this string text)
|
|||
|
|
{
|
|||
|
|
const string pattern = @"<(.|\n)*?>";
|
|||
|
|
return Regex.Replace(text, pattern, string.Empty, RegexOptions.Compiled);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Encodes as GUID.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input">The input.</param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static Guid EncodeAsGuid(this string input)
|
|||
|
|
{
|
|||
|
|
if (string.IsNullOrWhiteSpace(input)) throw new ArgumentNullException("input");
|
|||
|
|
|
|||
|
|
var convertToHex = input.ConvertToHex();
|
|||
|
|
var hexLength = convertToHex.Length < 32 ? convertToHex.Length : 32;
|
|||
|
|
var hex = convertToHex.Substring(0, hexLength).PadLeft(32, '0');
|
|||
|
|
var output = Guid.Empty;
|
|||
|
|
return Guid.TryParse(hex, out output) ? output : Guid.Empty;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Converts to hex.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input">The input.</param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string ConvertToHex(this string input)
|
|||
|
|
{
|
|||
|
|
if (string.IsNullOrEmpty(input)) return string.Empty;
|
|||
|
|
|
|||
|
|
var sb = new StringBuilder(input.Length);
|
|||
|
|
foreach (var c in input)
|
|||
|
|
{
|
|||
|
|
sb.AppendFormat("{0:x2}", Convert.ToUInt32(c));
|
|||
|
|
}
|
|||
|
|
return sb.ToString();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static string DecodeFromHex(this string hexValue)
|
|||
|
|
{
|
|||
|
|
var strValue = "";
|
|||
|
|
while (hexValue.Length > 0)
|
|||
|
|
{
|
|||
|
|
strValue += Convert.ToChar(Convert.ToUInt32(hexValue.Substring(0, 2), 16)).ToString();
|
|||
|
|
hexValue = hexValue.Substring(2, hexValue.Length - 2);
|
|||
|
|
}
|
|||
|
|
return strValue;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
///<summary>
|
|||
|
|
/// Encodes a string to a safe URL base64 string
|
|||
|
|
///</summary>
|
|||
|
|
///<param name="input"></param>
|
|||
|
|
///<returns></returns>
|
|||
|
|
public static string ToUrlBase64(this string input)
|
|||
|
|
{
|
|||
|
|
if (input == null) throw new ArgumentNullException(nameof(input));
|
|||
|
|
|
|||
|
|
if (string.IsNullOrEmpty(input))
|
|||
|
|
return string.Empty;
|
|||
|
|
|
|||
|
|
//return Convert.ToBase64String(bytes).Replace(".", "-").Replace("/", "_").Replace("=", ",");
|
|||
|
|
var bytes = Encoding.UTF8.GetBytes(input);
|
|||
|
|
return UrlTokenEncode(bytes);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Decodes a URL safe base64 string back
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string FromUrlBase64(this string input)
|
|||
|
|
{
|
|||
|
|
if (input == null) throw new ArgumentNullException(nameof(input));
|
|||
|
|
|
|||
|
|
//if (input.IsInvalidBase64()) return null;
|
|||
|
|
|
|||
|
|
try
|
|||
|
|
{
|
|||
|
|
//var decodedBytes = Convert.FromBase64String(input.Replace("-", ".").Replace("_", "/").Replace(",", "="));
|
|||
|
|
var decodedBytes = UrlTokenDecode(input);
|
|||
|
|
return decodedBytes != null ? Encoding.UTF8.GetString(decodedBytes) : null;
|
|||
|
|
}
|
|||
|
|
catch (FormatException)
|
|||
|
|
{
|
|||
|
|
return null;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// formats the string with invariant culture
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="format">The format.</param>
|
|||
|
|
/// <param name="args">The args.</param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string InvariantFormat(this string format, params object[] args)
|
|||
|
|
{
|
|||
|
|
return String.Format(CultureInfo.InvariantCulture, format, args);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Converts an integer to an invariant formatted string
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="str"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string ToInvariantString(this int str)
|
|||
|
|
{
|
|||
|
|
return str.ToString(CultureInfo.InvariantCulture);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static string ToInvariantString(this long str)
|
|||
|
|
{
|
|||
|
|
return str.ToString(CultureInfo.InvariantCulture);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Compares 2 strings with invariant culture and case ignored
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="compare">The compare.</param>
|
|||
|
|
/// <param name="compareTo">The compare to.</param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static bool InvariantEquals(this string compare, string compareTo)
|
|||
|
|
{
|
|||
|
|
return String.Equals(compare, compareTo, StringComparison.InvariantCultureIgnoreCase);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static bool InvariantStartsWith(this string compare, string compareTo)
|
|||
|
|
{
|
|||
|
|
return compare.StartsWith(compareTo, StringComparison.InvariantCultureIgnoreCase);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static bool InvariantEndsWith(this string compare, string compareTo)
|
|||
|
|
{
|
|||
|
|
return compare.EndsWith(compareTo, StringComparison.InvariantCultureIgnoreCase);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static bool InvariantContains(this string compare, string compareTo)
|
|||
|
|
{
|
|||
|
|
return compare.IndexOf(compareTo, StringComparison.OrdinalIgnoreCase) >= 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static bool InvariantContains(this IEnumerable<string> compare, string compareTo)
|
|||
|
|
{
|
|||
|
|
return compare.Contains(compareTo, StringComparer.InvariantCultureIgnoreCase);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static int InvariantIndexOf(this string s, string value)
|
|||
|
|
{
|
|||
|
|
return s.IndexOf(value, StringComparison.OrdinalIgnoreCase);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static int InvariantLastIndexOf(this string s, string value)
|
|||
|
|
{
|
|||
|
|
return s.LastIndexOf(value, StringComparison.OrdinalIgnoreCase);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Tries to parse a string into the supplied type by finding and using the Type's "Parse" method
|
|||
|
|
/// </summary>
|
|||
|
|
/// <typeparam name="T"></typeparam>
|
|||
|
|
/// <param name="val"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static T ParseInto<T>(this string val)
|
|||
|
|
{
|
|||
|
|
return (T)val.ParseInto(typeof(T));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Tries to parse a string into the supplied type by finding and using the Type's "Parse" method
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="val"></param>
|
|||
|
|
/// <param name="type"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static object ParseInto(this string val, Type type)
|
|||
|
|
{
|
|||
|
|
if (string.IsNullOrEmpty(val) == false)
|
|||
|
|
{
|
|||
|
|
TypeConverter tc = TypeDescriptor.GetConverter(type);
|
|||
|
|
return tc.ConvertFrom(val);
|
|||
|
|
}
|
|||
|
|
return val;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Generates a hash of a string based on the FIPS compliance setting.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="str">Refers to itself</param>
|
|||
|
|
/// <returns>The hashed string</returns>
|
|||
|
|
public static string GenerateHash(this string str)
|
|||
|
|
{
|
|||
|
|
return CryptoConfig.AllowOnlyFipsAlgorithms
|
|||
|
|
? str.ToSHA1()
|
|||
|
|
: str.ToMd5();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Converts the string to MD5
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="stringToConvert">Refers to itself</param>
|
|||
|
|
/// <returns>The MD5 hashed string</returns>
|
|||
|
|
public static string ToMd5(this string stringToConvert)
|
|||
|
|
{
|
|||
|
|
return stringToConvert.GenerateHash("MD5");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Converts the string to SHA1
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="stringToConvert">refers to itself</param>
|
|||
|
|
/// <returns>The SHA1 hashed string</returns>
|
|||
|
|
public static string ToSHA1(this string stringToConvert)
|
|||
|
|
{
|
|||
|
|
return stringToConvert.GenerateHash("SHA1");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>Generate a hash of a string based on the hashType passed in
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="str">Refers to itself</param>
|
|||
|
|
/// <param name="hashType">String with the hash type. See remarks section of the CryptoConfig Class in MSDN docs for a list of possible values.</param>
|
|||
|
|
/// <returns>The hashed string</returns>
|
|||
|
|
private static string GenerateHash(this string str, string hashType)
|
|||
|
|
{
|
|||
|
|
//create an instance of the correct hashing provider based on the type passed in
|
|||
|
|
var hasher = HashAlgorithm.Create(hashType);
|
|||
|
|
if (hasher == null) throw new InvalidOperationException("No hashing type found by name " + hashType);
|
|||
|
|
using (hasher)
|
|||
|
|
{
|
|||
|
|
//convert our string into byte array
|
|||
|
|
var byteArray = Encoding.UTF8.GetBytes(str);
|
|||
|
|
|
|||
|
|
//get the hashed values created by our selected provider
|
|||
|
|
var hashedByteArray = hasher.ComputeHash(byteArray);
|
|||
|
|
|
|||
|
|
//create a StringBuilder object
|
|||
|
|
var stringBuilder = new StringBuilder();
|
|||
|
|
|
|||
|
|
//loop to each byte
|
|||
|
|
foreach (var b in hashedByteArray)
|
|||
|
|
{
|
|||
|
|
//append it to our StringBuilder
|
|||
|
|
stringBuilder.Append(b.ToString("x2"));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
//return the hashed value
|
|||
|
|
return stringBuilder.ToString();
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Decodes a string that was encoded with UrlTokenEncode
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static byte[] UrlTokenDecode(this string input)
|
|||
|
|
{
|
|||
|
|
if (input == null)
|
|||
|
|
throw new ArgumentNullException(nameof(input));
|
|||
|
|
|
|||
|
|
if (input.Length == 0)
|
|||
|
|
return Array.Empty<byte>();
|
|||
|
|
|
|||
|
|
// calc array size - must be groups of 4
|
|||
|
|
var arrayLength = input.Length;
|
|||
|
|
var remain = arrayLength % 4;
|
|||
|
|
if (remain != 0) arrayLength += 4 - remain;
|
|||
|
|
|
|||
|
|
var inArray = new char[arrayLength];
|
|||
|
|
for (var i = 0; i < input.Length; i++)
|
|||
|
|
{
|
|||
|
|
var ch = input[i];
|
|||
|
|
switch (ch)
|
|||
|
|
{
|
|||
|
|
case '-': // restore '-' as '+'
|
|||
|
|
inArray[i] = '+';
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
case '_': // restore '_' as '/'
|
|||
|
|
inArray[i] = '/';
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
default: // keep char unchanged
|
|||
|
|
inArray[i] = ch;
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// pad with '='
|
|||
|
|
for (var j = input.Length; j < inArray.Length; j++)
|
|||
|
|
inArray[j] = '=';
|
|||
|
|
|
|||
|
|
return Convert.FromBase64CharArray(inArray, 0, inArray.Length);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Encodes a string so that it is 'safe' for URLs, files, etc..
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string UrlTokenEncode(this byte[] input)
|
|||
|
|
{
|
|||
|
|
if (input == null)
|
|||
|
|
throw new ArgumentNullException(nameof(input));
|
|||
|
|
|
|||
|
|
if (input.Length == 0)
|
|||
|
|
return string.Empty;
|
|||
|
|
|
|||
|
|
// base-64 digits are A-Z, a-z, 0-9, + and /
|
|||
|
|
// the = char is used for trailing padding
|
|||
|
|
|
|||
|
|
var str = Convert.ToBase64String(input);
|
|||
|
|
|
|||
|
|
var pos = str.IndexOf('=');
|
|||
|
|
if (pos < 0) pos = str.Length;
|
|||
|
|
|
|||
|
|
// replace chars that would cause problems in urls
|
|||
|
|
var chArray = new char[pos];
|
|||
|
|
for (var i = 0; i < pos; i++)
|
|||
|
|
{
|
|||
|
|
var ch = str[i];
|
|||
|
|
switch (ch)
|
|||
|
|
{
|
|||
|
|
case '+': // replace '+' with '-'
|
|||
|
|
chArray[i] = '-';
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
case '/': // replace '/' with '_'
|
|||
|
|
chArray[i] = '_';
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
default: // keep char unchanged
|
|||
|
|
chArray[i] = ch;
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return new string(chArray);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Ensures that the folder path ends with a DirectorySeparatorChar
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="currentFolder"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string NormaliseDirectoryPath(this string currentFolder)
|
|||
|
|
{
|
|||
|
|
currentFolder = currentFolder
|
|||
|
|
.IfNull(x => String.Empty)
|
|||
|
|
.TrimEnd(Path.DirectorySeparatorChar) + Path.DirectorySeparatorChar;
|
|||
|
|
return currentFolder;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Truncates the specified text string.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="text">The text.</param>
|
|||
|
|
/// <param name="maxLength">Length of the max.</param>
|
|||
|
|
/// <param name="suffix">The suffix.</param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string Truncate(this string text, int maxLength, string suffix = "...")
|
|||
|
|
{
|
|||
|
|
// replaces the truncated string to a ...
|
|||
|
|
var truncatedString = text;
|
|||
|
|
|
|||
|
|
if (maxLength <= 0) return truncatedString;
|
|||
|
|
var strLength = maxLength - suffix.Length;
|
|||
|
|
|
|||
|
|
if (strLength <= 0) return truncatedString;
|
|||
|
|
|
|||
|
|
if (text == null || text.Length <= maxLength) return truncatedString;
|
|||
|
|
|
|||
|
|
truncatedString = text.Substring(0, strLength);
|
|||
|
|
truncatedString = truncatedString.TrimEnd();
|
|||
|
|
truncatedString += suffix;
|
|||
|
|
|
|||
|
|
return truncatedString;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Strips carrage returns and line feeds from the specified text.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input">The input.</param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string StripNewLines(this string input)
|
|||
|
|
{
|
|||
|
|
return input.Replace("\r", "").Replace("\n", "");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Converts to single line by replacing line breaks with spaces.
|
|||
|
|
/// </summary>
|
|||
|
|
public static string ToSingleLine(this string text)
|
|||
|
|
{
|
|||
|
|
if (string.IsNullOrEmpty(text)) return text;
|
|||
|
|
text = text.Replace("\r\n", " "); // remove CRLF
|
|||
|
|
text = text.Replace("\r", " "); // remove CR
|
|||
|
|
text = text.Replace("\n", " "); // remove LF
|
|||
|
|
return text;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static string OrIfNullOrWhiteSpace(this string input, string alternative)
|
|||
|
|
{
|
|||
|
|
return !string.IsNullOrWhiteSpace(input)
|
|||
|
|
? input
|
|||
|
|
: alternative;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Returns a copy of the string with the first character converted to uppercase.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input">The string.</param>
|
|||
|
|
/// <returns>The converted string.</returns>
|
|||
|
|
public static string ToFirstUpper(this string input)
|
|||
|
|
{
|
|||
|
|
return string.IsNullOrWhiteSpace(input)
|
|||
|
|
? input
|
|||
|
|
: input.Substring(0, 1).ToUpper() + input.Substring(1);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Returns a copy of the string with the first character converted to lowercase.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input">The string.</param>
|
|||
|
|
/// <returns>The converted string.</returns>
|
|||
|
|
public static string ToFirstLower(this string input)
|
|||
|
|
{
|
|||
|
|
return string.IsNullOrWhiteSpace(input)
|
|||
|
|
? input
|
|||
|
|
: input.Substring(0, 1).ToLower() + input.Substring(1);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Returns a copy of the string with the first character converted to uppercase using the casing rules of the specified culture.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input">The string.</param>
|
|||
|
|
/// <param name="culture">The culture.</param>
|
|||
|
|
/// <returns>The converted string.</returns>
|
|||
|
|
public static string ToFirstUpper(this string input, CultureInfo culture)
|
|||
|
|
{
|
|||
|
|
return string.IsNullOrWhiteSpace(input)
|
|||
|
|
? input
|
|||
|
|
: input.Substring(0, 1).ToUpper(culture) + input.Substring(1);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Returns a copy of the string with the first character converted to lowercase using the casing rules of the specified culture.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input">The string.</param>
|
|||
|
|
/// <param name="culture">The culture.</param>
|
|||
|
|
/// <returns>The converted string.</returns>
|
|||
|
|
public static string ToFirstLower(this string input, CultureInfo culture)
|
|||
|
|
{
|
|||
|
|
return string.IsNullOrWhiteSpace(input)
|
|||
|
|
? input
|
|||
|
|
: input.Substring(0, 1).ToLower(culture) + input.Substring(1);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Returns a copy of the string with the first character converted to uppercase using the casing rules of the invariant culture.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input">The string.</param>
|
|||
|
|
/// <returns>The converted string.</returns>
|
|||
|
|
public static string ToFirstUpperInvariant(this string input)
|
|||
|
|
{
|
|||
|
|
return string.IsNullOrWhiteSpace(input)
|
|||
|
|
? input
|
|||
|
|
: input.Substring(0, 1).ToUpperInvariant() + input.Substring(1);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Returns a copy of the string with the first character converted to lowercase using the casing rules of the invariant culture.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="input">The string.</param>
|
|||
|
|
/// <returns>The converted string.</returns>
|
|||
|
|
public static string ToFirstLowerInvariant(this string input)
|
|||
|
|
{
|
|||
|
|
return string.IsNullOrWhiteSpace(input)
|
|||
|
|
? input
|
|||
|
|
: input.Substring(0, 1).ToLowerInvariant() + input.Substring(1);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Returns a new string in which all occurrences of specified strings are replaced by other specified strings.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="text">The string to filter.</param>
|
|||
|
|
/// <param name="replacements">The replacements definition.</param>
|
|||
|
|
/// <returns>The filtered string.</returns>
|
|||
|
|
public static string ReplaceMany(this string text, IDictionary<string, string> replacements)
|
|||
|
|
{
|
|||
|
|
if (text == null) throw new ArgumentNullException(nameof(text));
|
|||
|
|
if (replacements == null) throw new ArgumentNullException(nameof(replacements));
|
|||
|
|
|
|||
|
|
|
|||
|
|
foreach (KeyValuePair<string, string> item in replacements)
|
|||
|
|
text = text.Replace(item.Key, item.Value);
|
|||
|
|
|
|||
|
|
return text;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Returns a new string in which all occurrences of specified characters are replaced by a specified character.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="text">The string to filter.</param>
|
|||
|
|
/// <param name="chars">The characters to replace.</param>
|
|||
|
|
/// <param name="replacement">The replacement character.</param>
|
|||
|
|
/// <returns>The filtered string.</returns>
|
|||
|
|
public static string ReplaceMany(this string text, char[] chars, char replacement)
|
|||
|
|
{
|
|||
|
|
if (text == null) throw new ArgumentNullException(nameof(text));
|
|||
|
|
if (chars == null) throw new ArgumentNullException(nameof(chars));
|
|||
|
|
|
|||
|
|
|
|||
|
|
for (int i = 0; i < chars.Length; i++)
|
|||
|
|
text = text.Replace(chars[i], replacement);
|
|||
|
|
|
|||
|
|
return text;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// An extension method that returns a new string in which all occurrences of a
|
|||
|
|
/// specified string in the current instance are replaced with another specified string.
|
|||
|
|
/// StringComparison specifies the type of search to use for the specified string.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="source">Current instance of the string</param>
|
|||
|
|
/// <param name="oldString">Specified string to replace</param>
|
|||
|
|
/// <param name="newString">Specified string to inject</param>
|
|||
|
|
/// <param name="stringComparison">String Comparison object to specify search type</param>
|
|||
|
|
/// <returns>Updated string</returns>
|
|||
|
|
public static string Replace(this string source, string oldString, string newString, StringComparison stringComparison)
|
|||
|
|
{
|
|||
|
|
// This initialization ensures the first check starts at index zero of the source. On successive checks for
|
|||
|
|
// a match, the source is skipped to immediately after the last replaced occurrence for efficiency
|
|||
|
|
// and to avoid infinite loops when oldString and newString compare equal.
|
|||
|
|
int index = -1 * newString.Length;
|
|||
|
|
|
|||
|
|
// Determine if there are any matches left in source, starting from just after the result of replacing the last match.
|
|||
|
|
while ((index = source.IndexOf(oldString, index + newString.Length, stringComparison)) >= 0)
|
|||
|
|
{
|
|||
|
|
// Remove the old text.
|
|||
|
|
source = source.Remove(index, oldString.Length);
|
|||
|
|
|
|||
|
|
// Add the replacement text.
|
|||
|
|
source = source.Insert(index, newString);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return source;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Converts a literal string into a C# expression.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="s">Current instance of the string.</param>
|
|||
|
|
/// <returns>The string in a C# format.</returns>
|
|||
|
|
public static string ToCSharpString(this string s)
|
|||
|
|
{
|
|||
|
|
if (s == null) return "<null>";
|
|||
|
|
|
|||
|
|
// http://stackoverflow.com/questions/323640/can-i-convert-a-c-sharp-string-value-to-an-escaped-string-literal
|
|||
|
|
|
|||
|
|
var sb = new StringBuilder(s.Length + 2);
|
|||
|
|
for (var rp = 0; rp < s.Length; rp++)
|
|||
|
|
{
|
|||
|
|
var c = s[rp];
|
|||
|
|
if (c < ToCSharpEscapeChars.Length && '\0' != ToCSharpEscapeChars[c])
|
|||
|
|
sb.Append('\\').Append(ToCSharpEscapeChars[c]);
|
|||
|
|
else if ('~' >= c && c >= ' ')
|
|||
|
|
sb.Append(c);
|
|||
|
|
else
|
|||
|
|
sb.Append(@"\x")
|
|||
|
|
.Append(ToCSharpHexDigitLower[c >> 12 & 0x0F])
|
|||
|
|
.Append(ToCSharpHexDigitLower[c >> 8 & 0x0F])
|
|||
|
|
.Append(ToCSharpHexDigitLower[c >> 4 & 0x0F])
|
|||
|
|
.Append(ToCSharpHexDigitLower[c & 0x0F]);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return sb.ToString();
|
|||
|
|
|
|||
|
|
// requires full trust
|
|||
|
|
/*
|
|||
|
|
using (var writer = new StringWriter())
|
|||
|
|
using (var provider = CodeDomProvider.CreateProvider("CSharp"))
|
|||
|
|
{
|
|||
|
|
provider.GenerateCodeFromExpression(new CodePrimitiveExpression(s), writer, null);
|
|||
|
|
return writer.ToString().Replace(string.Format("\" +{0}\t\"", Environment.NewLine), "");
|
|||
|
|
}
|
|||
|
|
*/
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static string EscapeRegexSpecialCharacters(this string text)
|
|||
|
|
{
|
|||
|
|
var regexSpecialCharacters = new Dictionary<string, string>
|
|||
|
|
{
|
|||
|
|
{".", @"\."},
|
|||
|
|
{"(", @"\("},
|
|||
|
|
{")", @"\)"},
|
|||
|
|
{"]", @"\]"},
|
|||
|
|
{"[", @"\["},
|
|||
|
|
{"{", @"\{"},
|
|||
|
|
{"}", @"\}"},
|
|||
|
|
{"?", @"\?"},
|
|||
|
|
{"!", @"\!"},
|
|||
|
|
{"$", @"\$"},
|
|||
|
|
{"^", @"\^"},
|
|||
|
|
{"+", @"\+"},
|
|||
|
|
{"*", @"\*"},
|
|||
|
|
{"|", @"\|"},
|
|||
|
|
{"<", @"\<"},
|
|||
|
|
{">", @"\>"}
|
|||
|
|
};
|
|||
|
|
return ReplaceMany(text, regexSpecialCharacters);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Checks whether a string "haystack" contains within it any of the strings in the "needles" collection and returns true if it does or false if it doesn't
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="haystack">The string to check</param>
|
|||
|
|
/// <param name="needles">The collection of strings to check are contained within the first string</param>
|
|||
|
|
/// <param name="comparison">The type of comparison to perform - defaults to <see cref="StringComparison.CurrentCulture"/></param>
|
|||
|
|
/// <returns>True if any of the needles are contained with haystack; otherwise returns false</returns>
|
|||
|
|
/// Added fix to ensure the comparison is used - see http://issues.umbraco.org/issue/U4-11313
|
|||
|
|
public static bool ContainsAny(this string haystack, IEnumerable<string> needles, StringComparison comparison = StringComparison.CurrentCulture)
|
|||
|
|
{
|
|||
|
|
if (haystack == null)
|
|||
|
|
throw new ArgumentNullException("haystack");
|
|||
|
|
|
|||
|
|
if (string.IsNullOrEmpty(haystack) || needles == null || !needles.Any())
|
|||
|
|
{
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return needles.Any(value => haystack.IndexOf(value, comparison) >= 0);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static bool CsvContains(this string csv, string value)
|
|||
|
|
{
|
|||
|
|
if (string.IsNullOrEmpty(csv))
|
|||
|
|
{
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
var idCheckList = csv.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries);
|
|||
|
|
return idCheckList.Contains(value);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Converts a file name to a friendly name for a content item
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="fileName"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static string ToFriendlyName(this string fileName)
|
|||
|
|
{
|
|||
|
|
// strip the file extension
|
|||
|
|
fileName = fileName.StripFileExtension();
|
|||
|
|
|
|||
|
|
// underscores and dashes to spaces
|
|||
|
|
fileName = fileName.ReplaceMany(new[] { '_', '-' }, ' ');
|
|||
|
|
|
|||
|
|
// any other conversions ?
|
|||
|
|
|
|||
|
|
// Pascalcase (to be done last)
|
|||
|
|
fileName = CultureInfo.InvariantCulture.TextInfo.ToTitleCase(fileName);
|
|||
|
|
|
|||
|
|
// Replace multiple consecutive spaces with a single space
|
|||
|
|
fileName = string.Join(" ", fileName.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries));
|
|||
|
|
|
|||
|
|
return fileName;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// From: http://stackoverflow.com/a/961504/5018
|
|||
|
|
// filters control characters but allows only properly-formed surrogate sequences
|
|||
|
|
private static readonly Lazy<Regex> InvalidXmlChars = new Lazy<Regex>(() =>
|
|||
|
|
new Regex(
|
|||
|
|
@"(?<![\uD800-\uDBFF])[\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F\uFEFF\uFFFE\uFFFF]",
|
|||
|
|
RegexOptions.Compiled));
|
|||
|
|
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// An extension method that returns a new string in which all occurrences of an
|
|||
|
|
/// unicode characters that are invalid in XML files are replaced with an empty string.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="text">Current instance of the string</param>
|
|||
|
|
/// <returns>Updated string</returns>
|
|||
|
|
///
|
|||
|
|
/// <summary>
|
|||
|
|
/// removes any unusual unicode characters that can't be encoded into XML
|
|||
|
|
/// </summary>
|
|||
|
|
public static string ToValidXmlString(this string text)
|
|||
|
|
{
|
|||
|
|
return string.IsNullOrEmpty(text) ? text : InvalidXmlChars.Value.Replace(text, "");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Converts a string to a Guid - WARNING, depending on the string, this may not be unique
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="text"></param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
public static Guid ToGuid(this string text)
|
|||
|
|
{
|
|||
|
|
return CreateGuidFromHash(UrlNamespace,
|
|||
|
|
text,
|
|||
|
|
CryptoConfig.AllowOnlyFipsAlgorithms
|
|||
|
|
? 5 // SHA1
|
|||
|
|
: 3); // MD5
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// The namespace for URLs (from RFC 4122, Appendix C).
|
|||
|
|
///
|
|||
|
|
/// See <a href="http://www.ietf.org/rfc/rfc4122.txt">RFC 4122</a>
|
|||
|
|
/// </summary>
|
|||
|
|
internal static readonly Guid UrlNamespace = new Guid("6ba7b811-9dad-11d1-80b4-00c04fd430c8");
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Creates a name-based UUID using the algorithm from RFC 4122 §4.3.
|
|||
|
|
///
|
|||
|
|
/// See <a href="https://github.com/LogosBible/Logos.Utility/blob/master/src/Logos.Utility/GuidUtility.cs#L34">GuidUtility.cs</a> for original implementation.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="namespaceId">The ID of the namespace.</param>
|
|||
|
|
/// <param name="name">The name (within that namespace).</param>
|
|||
|
|
/// <param name="version">The version number of the UUID to create; this value must be either
|
|||
|
|
/// 3 (for MD5 hashing) or 5 (for SHA-1 hashing).</param>
|
|||
|
|
/// <returns>A UUID derived from the namespace and name.</returns>
|
|||
|
|
/// <remarks>See <a href="http://code.logos.com/blog/2011/04/generating_a_deterministic_guid.html">Generating a deterministic GUID</a>.</remarks>
|
|||
|
|
internal static Guid CreateGuidFromHash(Guid namespaceId, string name, int version)
|
|||
|
|
{
|
|||
|
|
if (name == null)
|
|||
|
|
throw new ArgumentNullException("name");
|
|||
|
|
if (version != 3 && version != 5)
|
|||
|
|
throw new ArgumentOutOfRangeException("version", "version must be either 3 or 5.");
|
|||
|
|
|
|||
|
|
// convert the name to a sequence of octets (as defined by the standard or conventions of its namespace) (step 3)
|
|||
|
|
// ASSUME: UTF-8 encoding is always appropriate
|
|||
|
|
byte[] nameBytes = Encoding.UTF8.GetBytes(name);
|
|||
|
|
|
|||
|
|
// convert the namespace UUID to network order (step 3)
|
|||
|
|
byte[] namespaceBytes = namespaceId.ToByteArray();
|
|||
|
|
SwapByteOrder(namespaceBytes);
|
|||
|
|
|
|||
|
|
// comput the hash of the name space ID concatenated with the name (step 4)
|
|||
|
|
byte[] hash;
|
|||
|
|
using (HashAlgorithm algorithm = version == 3 ? (HashAlgorithm)MD5.Create() : SHA1.Create())
|
|||
|
|
{
|
|||
|
|
algorithm.TransformBlock(namespaceBytes, 0, namespaceBytes.Length, null, 0);
|
|||
|
|
algorithm.TransformFinalBlock(nameBytes, 0, nameBytes.Length);
|
|||
|
|
hash = algorithm.Hash;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// most bytes from the hash are copied straight to the bytes of the new GUID (steps 5-7, 9, 11-12)
|
|||
|
|
byte[] newGuid = new byte[16];
|
|||
|
|
Array.Copy(hash, 0, newGuid, 0, 16);
|
|||
|
|
|
|||
|
|
// set the four most significant bits (bits 12 through 15) of the time_hi_and_version field to the appropriate 4-bit version number from Section 4.1.3 (step 8)
|
|||
|
|
newGuid[6] = (byte)((newGuid[6] & 0x0F) | (version << 4));
|
|||
|
|
|
|||
|
|
// set the two most significant bits (bits 6 and 7) of the clock_seq_hi_and_reserved to zero and one, respectively (step 10)
|
|||
|
|
newGuid[8] = (byte)((newGuid[8] & 0x3F) | 0x80);
|
|||
|
|
|
|||
|
|
// convert the resulting UUID to local byte order (step 13)
|
|||
|
|
SwapByteOrder(newGuid);
|
|||
|
|
return new Guid(newGuid);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Converts a GUID (expressed as a byte array) to/from network order (MSB-first).
|
|||
|
|
internal static void SwapByteOrder(byte[] guid)
|
|||
|
|
{
|
|||
|
|
SwapBytes(guid, 0, 3);
|
|||
|
|
SwapBytes(guid, 1, 2);
|
|||
|
|
SwapBytes(guid, 4, 5);
|
|||
|
|
SwapBytes(guid, 6, 7);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
private static void SwapBytes(byte[] guid, int left, int right)
|
|||
|
|
{
|
|||
|
|
byte temp = guid[left];
|
|||
|
|
guid[left] = guid[right];
|
|||
|
|
guid[right] = temp;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Turns an null-or-whitespace string into a null string.
|
|||
|
|
/// </summary>
|
|||
|
|
public static string NullOrWhiteSpaceAsNull(this string text)
|
|||
|
|
=> string.IsNullOrWhiteSpace(text) ? null : text;
|
|||
|
|
}
|
|||
|
|
}
|