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using System;
using System.Linq;
using System.Text.Json;
using System.Collections.Generic;
using VNLib.Hashing;
using VNLib.Utils.Extensions;
namespace VNLib.Plugins.Essentials.Accounts.MFA
{
internal class MFAConfig
{
public byte[]? MFASecret { get; set; } = null;
public bool TOTPEnabled { get; } = false;
public string? IssuerName { get; }
public TimeSpan TOTPPeriod { get; }
public HashAlg TOTPAlg { get; }
public int TOTPDigits { get; }
public int TOTPSecretBytes { get; }
public int TOTPTimeWindowSteps { get; }
public bool FIDOEnabled { get; }
public int FIDOChallangeSize { get; }
public int FIDOTimeout { get; }
public string? FIDOSiteName { get; }
public string? FIDOAttestationType { get; }
public FidoAuthenticatorSelection? FIDOAuthSelection { get; }
public TimeSpan UpgradeValidFor { get; }
public int NonceLenBytes { get; }
public MFAConfig(IReadOnlyDictionary<string, JsonElement> conf)
{
UpgradeValidFor = conf["upgrade_expires_secs"].GetTimeSpan(TimeParseType.Seconds);
NonceLenBytes = conf["nonce_size"].GetInt32();
string siteName = conf["site_name"].GetString() ?? throw new KeyNotFoundException("Missing required key 'site_name' in 'mfa' config");
//Totp setup
if (conf.TryGetValue("totp", out JsonElement totpEl))
{
IReadOnlyDictionary<string, JsonElement> totp = totpEl.EnumerateObject().ToDictionary(k => k.Name, k => k.Value);
//Get totp config
IssuerName = siteName;
//Get alg name
string TOTPAlgName = totp["algorithm"].GetString()?.ToUpper() ?? throw new KeyNotFoundException("Missing required key 'algorithm' in plugin 'mfa' config");
//Parse from enum string
TOTPAlg = Enum.Parse<HashAlg>(TOTPAlgName);
TOTPDigits = totp["digits"].GetInt32();
TOTPPeriod = TimeSpan.FromSeconds(totp["period_secs"].GetInt32());
TOTPSecretBytes = totp["secret_size"].GetInt32();
TOTPTimeWindowSteps = totp["window_size"].GetInt32();
//Set enabled flag
TOTPEnabled = true;
}
//Fido setup
if(conf.TryGetValue("fido", out JsonElement fidoEl))
{
IReadOnlyDictionary<string, JsonElement> fido = fidoEl.EnumerateObject().ToDictionary(k => k.Name, k => k.Value);
FIDOChallangeSize = fido["challenge_size"].GetInt32();
FIDOAttestationType = fido["attestation"].GetString();
FIDOTimeout = fido["timeout"].GetInt32();
FIDOSiteName = siteName;
//Deserailze a
if(fido.TryGetValue("authenticatorSelection", out JsonElement authSel))
{
FIDOAuthSelection = authSel.Deserialize<FidoAuthenticatorSelection>();
}
//Set enabled flag
FIDOEnabled = true;
}
}
}
}
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