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StringUtils.cs
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StringUtils.cs
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namespace Stripe.Infrastructure
{
using System;
using System.Runtime.CompilerServices;
using System.Text.RegularExpressions;
internal static class StringUtils
{
private static Regex whitespaceRegex = new Regex(@"\s", RegexOptions.CultureInvariant);
/// <summary>Converts the string to snake case.</summary>
/// <param name="str">The string to convert.</param>
/// <returns>A string with the contents of the input string converted to snake_case.</returns>
public static string ToSnakeCase(string str)
{
var tmp = Regex.Replace(str, "(.)([A-Z][a-z]+)", "$1_$2");
return Regex.Replace(tmp, "([a-z0-9])([A-Z])", "$1_$2").ToLower();
}
/// <summary>
/// Determines whether the two specified <see cref="string"/> objects have the same value.
/// The comparison is done in constant time to prevent timing attacks.
/// </summary>
/// <param name="a">The first string to compare.</param>
/// <param name="b">The second string to compare.</param>
/// <returns>
/// <c>true</c> if the value of the <c>a</c> parameter is equal to the value of the <c>b</c>
/// parameter; otherwise, <c>false</c>.
/// </returns>
[MethodImpl(MethodImplOptions.NoOptimization)]
public static bool SecureEquals(string a, string b)
{
if (a == null)
{
throw new ArgumentNullException(nameof(a));
}
if (b == null)
{
throw new ArgumentNullException(nameof(b));
}
if (a.Length != b.Length)
{
return false;
}
var result = 0;
for (var i = 0; i < a.Length; i++)
{
result |= a[i] ^ b[i];
}
return result == 0;
}
/// <summary>Checks whether a string contains any whitespace characters or not.</summary>
/// <param name="str">The string to check.</param>
/// <returns>
/// <c>true</c> if the string contains any whitespace characters; otherwise, <c>false</c>.
/// </returns>
/// <exception name="ArgumentNullException">Thrown if <c>str</c> is <c>null</c>.</exception>
public static bool ContainsWhitespace(string str)
{
if (str == null)
{
throw new ArgumentNullException(nameof(str));
}
return whitespaceRegex.IsMatch(str);
}
}
}