Add project files.

MyOffice.Core/Extensions/BoolExtensions.cs

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+namespace MyOffice.Core.Extensions;
+
+public static class BoolExtensions
+{
+	public static string ToLowerCase(this bool value)
+	{
+		return value.ToString().ToLower();
+	}
+
+	public static string? ToLowerCase(this bool? value)
+	{
+		return value == null ? null : value.ToString()?.ToLower();
+	}
+}

MyOffice.Core/Extensions/ClaimsExtensions.cs

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+namespace MyOffice.Core.Extensions;
+
+using System.Security.Claims;
+
+public static class ClaimsExtensions
+{
+	public static string? GetValue(this IEnumerable<Claim> claims, string type)
+	{
+		return claims.FirstOrDefault(x => x.Type.Equals(type, StringComparison.OrdinalIgnoreCase))?.Value;
+	}
+
+	public static string? GetValue(this IEnumerable<Claim> claims, string[] types)
+	{
+		return claims.FirstOrDefault(x => types.Any(z => x.Type.Equals(z, StringComparison.OrdinalIgnoreCase)))?.Value;
+	}
+
+	public static string? GetEmail(this IEnumerable<Claim> claims)
+	{
+		return GetValue(claims, new[] { ClaimTypes.Email, "email" });
+	}
+
+	public static string? GetNameIdentifier(this IEnumerable<Claim> claims)
+	{
+		return GetValue(claims, ClaimTypes.NameIdentifier);
+	}
+
+	public static string? GetSID(this IEnumerable<Claim> claims)
+	{
+		return GetValue(claims, "sid");
+	}
+}

MyOffice.Core/Extensions/GuidExtensions.cs

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+namespace MyOffice.Core.Extensions;
+
+public static class GuidExtensions
+{
+	public static bool EqualsString(this Guid guid, string str)
+	{
+		return guid.ToString().EqualsIgnoreCase(str);
+	}
+}

MyOffice.Core/Extensions/StringExtensions.cs

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+namespace MyOffice.Core.Extensions;
+
+public static class StringExtensions
+{
+	public static bool IsMissing(this string? str)
+	{
+		return str == null || string.IsNullOrEmpty(str) || string.IsNullOrEmpty(str.Trim());
+	}
+
+	public static bool IsPresent(this string? str)
+	{
+		return !IsMissing(str);
+	}
+
+	public static string? NullIfEmpty(this string? str)
+	{
+		return IsMissing(str) ? null : str;
+	}
+
+	public static bool EqualsIgnoreCase(this string? str, string? value)
+	{
+		return str != null && str.Equals(value, StringComparison.OrdinalIgnoreCase);
+	}
+
+	public static bool AsBool(this string? str, bool defaultValue = false)
+	{
+		return true.ToString().Equals(str, StringComparison.OrdinalIgnoreCase) || defaultValue;
+	}
+}