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using System.Collections.Generic;
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using System.Collections.Specialized;
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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 AngleSharp.Dom;
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using AngleSharp.Html;
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using NzbDrone.Common.Extensions;
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namespace NzbDrone.Core.Parser
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{
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public static class StringUtil
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{
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/*
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public static string StripNonAlphaNumeric(this string str, string replacement = "") =>
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StripRegex(str, "[^a-zA-Z0-9 -]", replacement);
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public static string StripRegex(string str, string regex, string replacement = "")
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{
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var rgx = new Regex(regex);
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str = rgx.Replace(str, replacement);
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return str;
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}
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// replaces culture specific characters with the corresponding base characters (e.g. è becomes e).
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public static string RemoveDiacritics(string s)
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{
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var normalizedString = s.Normalize(NormalizationForm.FormD);
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var stringBuilder = new StringBuilder();
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for (var i = 0; i < normalizedString.Length; i++)
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{
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var c = normalizedString[i];
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if (CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark)
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stringBuilder.Append(c);
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}
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return stringBuilder.ToString();
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}
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public static string FromBase64(string str) =>
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Encoding.UTF8.GetString(Convert.FromBase64String(str));
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/// <summary>
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/// Convert an array of bytes to a string of hex digits
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/// </summary>
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/// <param name="bytes">array of bytes</param>
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/// <returns>String of hex digits</returns>
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public static string HexStringFromBytes(byte[] bytes) =>
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string.Join("", bytes.Select(b => b.ToString("X2")));
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/// <summary>
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/// Compute hash for string encoded as UTF8
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/// </summary>
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/// <param name="s">String to be hashed</param>
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/// <returns>40-character hex string</returns>
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public static string HashSHA1(string s)
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{
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var sha1 = SHA1.Create();
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var bytes = Encoding.UTF8.GetBytes(s);
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var hashBytes = sha1.ComputeHash(bytes);
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return HexStringFromBytes(hashBytes);
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}
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public static string Hash(string s)
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{
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// Use input string to calculate MD5 hash
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var md5 = System.Security.Cryptography.MD5.Create();
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var inputBytes = System.Text.Encoding.ASCII.GetBytes(s);
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var hashBytes = md5.ComputeHash(inputBytes);
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return HexStringFromBytes(hashBytes);
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}
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// Is never used
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// remove in favor of Exception.ToString() ?
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public static string GetExceptionDetails(this Exception exception)
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{
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var properties = exception.GetType()
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.GetProperties();
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var fields = properties
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.Select(property => new
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{
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Name = property.Name,
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Value = property.GetValue(exception, null)
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})
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.Select(x => string.Format(
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"{0} = {1}",
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x.Name,
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x.Value != null ? x.Value.ToString() : string.Empty
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));
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return string.Join("\n", fields);
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}
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*/
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private static char[] MakeValidFileName_invalids;
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/// <summary>Replaces characters in <c>text</c> that are not allowed in
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/// file names with the specified replacement character.</summary>
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/// <param name="text">Text to make into a valid filename. The same string is returned if it is valid already.</param>
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/// <param name="replacement">Replacement character, or null to simply remove bad characters.</param>
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/// <param name="fancy">Whether to replace quotes and slashes with the non-ASCII characters ” and ⁄.</param>
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/// <returns>A string that can be used as a filename. If the output string would otherwise be empty, returns "_".</returns>
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public static string MakeValidFileName(string text, char? replacement = '_', bool fancy = true)
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{
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var sb = new StringBuilder(text.Length);
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var invalids = MakeValidFileName_invalids ?? (MakeValidFileName_invalids = Path.GetInvalidFileNameChars());
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var changed = false;
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for (var i = 0; i < text.Length; i++)
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{
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var c = text[i];
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if (invalids.Contains(c))
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{
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changed = true;
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var repl = replacement ?? '\0';
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if (fancy)
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{
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if (c == '"')
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{
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repl = '”'; // U+201D right double quotation mark
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}
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else if (c == '\'')
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{
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repl = '’'; // U+2019 right single quotation mark
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}
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else if (c == '/')
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{
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repl = '⁄'; // U+2044 fraction slash
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}
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}
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if (repl != '\0')
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{
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sb.Append(repl);
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}
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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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}
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if (sb.Length == 0)
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{
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return "_";
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}
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return changed ? sb.ToString() : text;
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}
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/// <summary>
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/// Converts a NameValueCollection to an appropriately formatted query string.
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/// Duplicate keys are allowed in a NameValueCollection, but are stored as a csv string in Value.
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/// This function handles leaving the values together in the csv string or splitting the value into separate keys
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/// </summary>
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/// <param name="collection">The NameValueCollection being converted</param>
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/// <param name="encoding">The Encoding to use in url encoding Value</param>
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/// <param name="duplicateKeysIfMulti">Duplicate keys are handled as true => {"Key=Val1", "Key=Val2} or false => {"Key=Val1,Val2"}</param>
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/// <param name="separator">The string used to separate each query value</param>
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/// <returns>A web encoded string of key=value parameters separated by the separator</returns>
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public static string GetQueryString(this NameValueCollection collection,
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Encoding encoding = null,
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bool duplicateKeysIfMulti = false,
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string separator = "&") =>
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collection.ToEnumerable(duplicateKeysIfMulti).GetQueryString(encoding, separator);
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public static string GetQueryString(this IEnumerable<KeyValuePair<string, string>> collection,
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Encoding encoding = null,
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string separator = "&") =>
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string.Join(separator,
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collection.Select(a => $"{a.Key}={a.Value.UrlEncode(encoding ?? Encoding.UTF8)}"));
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public static void Add(this ICollection<KeyValuePair<string, string>> collection, string key, string value) => collection.Add(new KeyValuePair<string, string>(key, value));
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public static IEnumerable<KeyValuePair<string, string>> ToEnumerable(
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this NameValueCollection collection, bool duplicateKeysIfMulti = false)
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{
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foreach (string key in collection.Keys)
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{
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var value = collection[key];
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if (duplicateKeysIfMulti)
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{
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foreach (var val in value.Split(','))
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{
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yield return new KeyValuePair<string, string>(key, val);
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}
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}
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else
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{
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yield return new KeyValuePair<string, string>(key, value);
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}
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}
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}
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public static string ToHtmlPretty(this IElement element)
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{
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if (element == null)
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{
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return "<NULL>";
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}
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var sb = new StringBuilder();
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var sw = new StringWriter(sb);
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var formatter = new PrettyMarkupFormatter();
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element.ToHtml(sw, formatter);
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return sb.ToString();
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}
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public static string GenerateRandom(int length)
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{
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var chars = "abcdefghijklmnopqrstuvwxyz0123456789";
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var randBytes = new byte[length];
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using (var rngCsp = new RNGCryptoServiceProvider())
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{
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rngCsp.GetBytes(randBytes);
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var key = "";
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foreach (var b in randBytes)
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{
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key += chars[b % chars.Length];
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}
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return key;
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}
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}
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}
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}
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