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using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Timeline.Configs;
using Timeline.Entities;
namespace Timeline.Services.Token
{
public class SecureRandomUserTokenService : IUserTokenService, IDisposable
{
private DatabaseContext _databaseContext;
private ILogger<SecureRandomUserTokenService> _logger;
private RandomNumberGenerator _secureRandom;
private IOptionsMonitor<TokenOptions> _optionMonitor;
private IClock _clock;
public SecureRandomUserTokenService(DatabaseContext databaseContext, ILogger<SecureRandomUserTokenService> logger, IOptionsMonitor<TokenOptions> optionMonitor, IClock clock)
{
_databaseContext = databaseContext;
_logger = logger;
_secureRandom = RandomNumberGenerator.Create();
_optionMonitor = optionMonitor;
_clock = clock;
}
public void Dispose()
{
_secureRandom.Dispose();
}
private static readonly char[] AlphaDigitString = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray();
private string GenerateSecureRandomTokenString()
{
var option = _optionMonitor.CurrentValue;
var tokenLength = option.TokenLength ?? 16;
var buffer = new byte[tokenLength];
_secureRandom.GetBytes(buffer);
StringBuilder stringBuilder = new();
foreach (byte b in buffer)
{
stringBuilder.Append(AlphaDigitString[b % AlphaDigitString.Length]);
}
return stringBuilder.ToString();
}
/// <inheritdoc/>
public async Task<string> CreateTokenAsync(long userId, DateTime? expireTime)
{
var currentTime = _clock.GetCurrentTime();
if (expireTime is not null && expireTime > currentTime)
{
_logger.LogWarning("The expire time of the token has already passed.");
}
UserTokenEntity entity = new UserTokenEntity
{
UserId = userId,
Token = GenerateSecureRandomTokenString(),
ExpireAt = expireTime,
CreateAt = currentTime,
Deleted = false
};
_databaseContext.UserTokens.Add(entity);
await _databaseContext.SaveChangesAsync();
_logger.LogInformation("A user token is created with user id {}.", userId);
return entity.Token;
}
/// <inheritdoc/>
public async Task<UserTokenInfo> ValidateTokenAsync(string token)
{
var entity = await _databaseContext.UserTokens.Where(t => t.Token == token && !t.Deleted).SingleOrDefaultAsync();
if (entity is null)
{
throw new UserTokenException(token, Resource.ExceptionUserTokenInvalid);
}
var currentTime = _clock.GetCurrentTime();
if (entity.ExpireAt.HasValue && entity.ExpireAt.Value <= currentTime)
{
throw new UserTokenExpiredException(token, entity.ExpireAt.Value, currentTime);
}
return new UserTokenInfo()
{
UserId = entity.UserId,
ExpireAt = entity.ExpireAt,
CreateAt = entity.CreateAt
};
}
/// <inheritdoc/>
public async Task<bool> RevokeTokenAsync(string token)
{
var entity = await _databaseContext.UserTokens.Where(t => t.Token == token && t.Deleted == false).SingleOrDefaultAsync();
if (entity is not null)
{
entity.Deleted = true;
await _databaseContext.SaveChangesAsync();
_logger.LogInformation("A token is revoked with user id {}.", entity.UserId);
return entity.ExpireAt <= _clock.GetCurrentTime();
}
return false;
}
/// <inheritdoc/>
public async Task RevokeAllTokenByUserIdAsync(long userId)
{
List<UserTokenEntity> entities = await _databaseContext.UserTokens.Where(t => t.UserId == userId && t.Deleted == false).ToListAsync();
foreach (var entity in entities)
{
entity.Deleted = true;
}
await _databaseContext.SaveChangesAsync();
_logger.LogInformation("All tokens of user with id {} are revoked.", userId);
}
}
}
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