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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.Accounts
* File: MfaEncodedData.cs
*
* MfaEncodedData.cs is part of VNLib.Plugins.Essentials.Accounts which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Essentials.Accounts is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Essentials.Accounts is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System;
using System.Text.Json;
using VNLib.Utils;
using VNLib.Utils.IO;
using VNLib.Utils.Memory;
namespace VNLib.Plugins.Essentials.Accounts.MFA
{
internal static class UserEnocdedData
{
/// <summary>
/// Recovers encoded items from the user's account object
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="store">The data store to read encoded data from</param>
/// <param name="index">The property index in the user fields to recover the objects from</param>
/// <returns>The encoded properties from the desired user index</returns>
public static T? Decode<T>(IIndexable<string, string> store, string index) where T : class
{
ArgumentNullException.ThrowIfNull(store);
ArgumentException.ThrowIfNullOrWhiteSpace(index);
string? encodedData = store[index];
if (string.IsNullOrWhiteSpace(encodedData))
{
return null;
}
//Output buffer will always be smaller than actual input data due to base64 encoding
using UnsafeMemoryHandle<byte> binBuffer = MemoryUtil.UnsafeAllocNearestPage(encodedData.Length, true);
ERRNO bytes = VnEncoding.Base64UrlDecode(encodedData, binBuffer.Span);
if (!bytes)
{
return null;
}
//Deserialize the objects directly from binary data
return JsonSerializer.Deserialize<T>(
utf8Json: binBuffer.AsSpan(0, bytes),
options: Statics.SR_OPTIONS
);
}
/// <summary>
/// Writes a set of items to the user's account object, encoded in base64
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="store"></param>
/// <param name="index">The store index to write the encoded string data to</param>
/// <param name="instance">The object instance to encode and store</param>
public static void Encode<T>(IIndexable<string, string> store, string index, T? instance) where T : class
{
ArgumentNullException.ThrowIfNull(store);
ArgumentException.ThrowIfNullOrWhiteSpace(index);
if (instance == null)
{
store[index] = null!;
return;
}
//Use a memory stream to serialize the items safely
using VnMemoryStream ms = new(MemoryUtil.Shared, 1024, false);
JsonSerializer.Serialize(ms, instance, Statics.SR_OPTIONS);
store[index] = VnEncoding.Base64UrlEncode(ms.AsSpan(), false);
}
}
}
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