public static void AddHackerSpray(this IServiceCollection services, IConfigurationSection section)
{
var prefix = section["Prefix"];
if (string.IsNullOrWhiteSpace(prefix))
{
throw new Exception("Invalid prefix configured in section: " + section.Key);
}
var redis = section["Redis"];
if (string.IsNullOrWhiteSpace(redis))
{
throw new Exception("Invalid redis connection string configured in section: " + section.Key);
}
IEnumerable <string> keys = section.GetSection("Keys").GetChildren().Select(x => x.Value);
var option = new HackerSprayOption
{
Keys = keys.ToList(),
Prefix = prefix,
Redis = redis
};
services.AddSingleton <HackerSprayOption>(option);
}
public HackerSprayerMiddleware(RequestDelegate next, ILoggerFactory loggerFactory, HackerSprayOption option)
{
_next = next;
_logger = loggerFactory.CreateLogger("HackerSpray");
if (_option == null)
{
lock (_lockObject)
{
if (_option == null)
{
Debug("Initializing HackerSpray options.");
_option = option;
Hacker.Logger = _logger;
Hacker.Store = new RedisDefenceStore(_option.Redis,
_option.Prefix, Hacker.Config);
_keys = new HackerSprayOptionKey[_option.Keys.Count];
for (var i = 0; i < _option.Keys.Count; i++)
{
var parts = _option.Keys[i].Split(' ');
if (parts.Length != 5)
{
throw new Exception("Each key must have exactly 4 parts - METHOD PATH MAXATTEMPTS INTERVAL MODE. But you have put: " + _option.Keys[i]);
}
long maxAttempts;
if (!long.TryParse(parts[2], out maxAttempts))
{
throw new Exception($"Invalid max attempts configured for key{parts[0]}. Must be a number.");
}
TimeSpan interval;
if (!TimeSpan.TryParse(parts[3], out interval))
{
throw new Exception($"Invalid interval configured for key{parts[0]}. Must be a TimeSpan eg 00:01:00.");
}
var mode = default(HackerSprayOptionKey.HitCountMode);
if (parts[4] == "key")
{
mode = HackerSprayOptionKey.HitCountMode.PerKey;
}
else if (parts[4] == "origin")
{
mode = HackerSprayOptionKey.HitCountMode.PerOrigin;
}
else
{
mode = HackerSprayOptionKey.HitCountMode.PerKeyOrigin;
}
_keys[i] = new HackerSprayOptionKey()
{
Method = parts[0],
Key = parts[1],
MaxAttempts = maxAttempts,
Interval = interval,
Mode = mode
};
}
Debug("HackerSpray options processed");
}
}
}
}