bitwarden/src/Core/IdentityServer/RedisCacheTicketStore.cs

using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.Extensions.Caching.Distributed;
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.Caching.Redis;

namespace Bit.Core.IdentityServer
{
    public class RedisCacheTicketStore : ITicketStore
    {
        private const string _keyPrefix = "auth-";
        private readonly IDistributedCache _cache;

        public RedisCacheTicketStore(RedisCacheOptions options)
        {
            _cache = new RedisCache(options);
        }

        public async Task<string> StoreAsync(AuthenticationTicket ticket)
        {
            var key = $"{_keyPrefix}{Guid.NewGuid()}";
            await RenewAsync(key, ticket);

            return key;
        }

        public Task RenewAsync(string key, AuthenticationTicket ticket)
        {
            var options = new DistributedCacheEntryOptions();
            var expiresUtc = ticket.Properties.ExpiresUtc ??
                DateTimeOffset.UtcNow.AddMinutes(15);
            options.SetAbsoluteExpiration(expiresUtc);

            var val = SerializeToBytes(ticket);
            _cache.Set(key, val, options);

            return Task.FromResult(0);
        }

        public Task<AuthenticationTicket> RetrieveAsync(string key)
        {
            AuthenticationTicket ticket;
            var bytes = _cache.Get(key);
            ticket = DeserializeFromBytes(bytes);

            return Task.FromResult(ticket);
        }

        public Task RemoveAsync(string key)
        {
            _cache.Remove(key);

            return Task.FromResult(0);
        }

        private static byte[] SerializeToBytes(AuthenticationTicket source)
        {
            return TicketSerializer.Default.Serialize(source);
        }

        private static AuthenticationTicket DeserializeFromBytes(byte[] source)
        {
            return source == null ? null : TicketSerializer.Default.Deserialize(source);
        }
    }
}