/// <summary>
/// Initializes a new instance of the <see cref="ThrottleProcesser"/> class.
/// By default, the <see cref="QuotaExceededResponseCode"/> property
/// is set to 429 (Too Many Requests).
/// </summary>
public ThrottleProcesser(
ThrottlePolicy policy,
IIpAddressParser ipAddressParser,
IPolicyRepository policyRepo = null,
IThrottleRepository throttleRepo = null)
{
Logger = new DefaultThrottleLogger();
QuotaExceededResponseCode = (HttpStatusCode)429;
processResult = new ThrottleProcessResult {
IsPass = true
};
ThrottleRepo = throttleRepo;
if (ThrottleRepo == null)
{
ThrottleRepo = new WebCacheThrottleRepository();
}
ThrottlingCore = new ThrottlingCore(ipAddressParser);
ThrottlingCore.ThrottleRepo = ThrottleRepo;
PolicyRepo = policyRepo;
if (PolicyRepo == null)
{
PolicyRepo = new WebCachePolicyRepository();
}
Policy = policy;
PolicyRepo.Save(ThrottleManager.GetPolicyKey(), policy);
}
public ThrottleProcessResult Process(RequestIdentity identity, IEnableThrottlingAttribute attrPolicy = null)
{
Identity = identity;
Policy = PolicyRepo.FirstOrDefault(ThrottleManager.GetPolicyKey());
if (Policy != null)
{
Checking(attrPolicy);
}
return(processResult);
}
public string ComputeThrottleKey(RequestIdentity requestIdentity, RateLimitPeriod period)
{
var keyValues = new List <string>()
{
ThrottleManager.GetThrottleKey()
};
if (Policy.IpThrottling)
{
keyValues.Add(requestIdentity.ClientIp);
}
if (Policy.ClientThrottling)
{
keyValues.Add(requestIdentity.ClientKey);
}
if (Policy.EndpointThrottling)
{
keyValues.Add(requestIdentity.Endpoint);
}
keyValues.Add(period.ToString());
var id = string.Join("_", keyValues);
var idBytes = Encoding.UTF8.GetBytes(id);
byte[] hashBytes;
using (var algorithm = System.Security.Cryptography.HashAlgorithm.Create("SHA1"))
{
hashBytes = algorithm.ComputeHash(idBytes);
}
var hex = BitConverter.ToString(hashBytes).Replace("-", string.Empty);
return(hex);
}
