/// <summary>
/// Builds the set used to identify a specific endpoint variant
/// </summary>
/// <param name="dualStack">Whether to use a dualstack (IPv6 enabled) endpoint</param>
/// <param name="fips">Whether to use a FIPS-compliant endpoint</param>
/// <returns>Set used to identify the combined variant in endpoints.json</returns>
private static HashSet <string> BuildVariantHashSet(GetEndpointForServiceOptions options)
{
options = options ?? new GetEndpointForServiceOptions();
if (!options.DualStack && !options.FIPS)
{
return(null);
}
var variants = new HashSet <string>();
if (options.DualStack)
{
variants.Add("dualstack");
}
if (options.FIPS)
{
variants.Add("fips");
}
return(variants);
}
/// <summary>
/// Retrieves the endpoint for the given service in the current region
/// </summary>
/// <param name="serviceName">Name of the service in endpoints.json</param>
/// <param name="options"> Specify additional requirements on the <see cref="RegionEndpoint.Endpoint"/> to be returned.</param>
/// <returns>Matching endpoint from endpoints.json, or a computed endpoint if possible</returns>
public RegionEndpoint.Endpoint GetEndpointForService(string serviceName, GetEndpointForServiceOptions options)
{
var variants = BuildVariantHashSet(options);
return(GetEndpointForService(serviceName, variants));
}
/// <summary>
/// Gets the endpoint for a service in a region.
/// </summary>
/// <param name="serviceName">The services system name.</param>
/// <param name="options"> Specify additional requirements on the <see cref="Amazon.RegionEndpoint.Endpoint"/> to be returned.</param>
/// <exception cref="System.ArgumentException">Thrown when the request service does not have a valid endpoint in the region.</exception>
public Amazon.RegionEndpoint.Endpoint GetEndpointForService(string serviceName, GetEndpointForServiceOptions options)
{
if (options?.FIPS == true)
{
throw new NotSupportedException($"{typeof(RegionEndpointProviderV2)} does not support FIPS");
}
if (!RegionEndpoint.loaded)
{
RegionEndpoint.LoadEndpointDefinitions();
}
var rule = GetEndpointRule(serviceName);
var endpointTemplate = rule["endpoint"].ToString();
if (options?.DualStack == true)
{
// We need special handling for S3's s3.amazonaws.com endpoint, which doesn't
// support dualstack (need to transform to s3.dualstack.us-east-1.amazonaws.com).
// Other endpoints that begin s3-* need to transform to s3.* for dualstack support.
// S3's 'external' endpoints do not support dualstack and should not be transformed.
if (serviceName.Equals("s3", StringComparison.OrdinalIgnoreCase))
{
if (endpointTemplate.Equals("s3.amazonaws.com", StringComparison.OrdinalIgnoreCase))
{
endpointTemplate = "s3.dualstack.us-east-1.amazonaws.com";
}
else
{
var isExternalEndpoint = endpointTemplate.StartsWith("s3-external-", StringComparison.OrdinalIgnoreCase);
if (!isExternalEndpoint)
{
// transform fixed s3-<region> to s3.<region> and then onto s3.dualstack.<region>,
// bypassing endpoints that do not start with the expected tags.
if (endpointTemplate.StartsWith("s3-", StringComparison.OrdinalIgnoreCase))
{
endpointTemplate = "s3." + endpointTemplate.Substring(3);
}
if (endpointTemplate.StartsWith("s3.", StringComparison.OrdinalIgnoreCase))
{
endpointTemplate = endpointTemplate.Replace("s3.", "s3.dualstack.");
}
}
}
}
else
{
endpointTemplate = endpointTemplate.Replace("{region}", "dualstack.{region}");
}
}
var hostName = endpointTemplate.Replace("{region}", this.SystemName).Replace("{service}", serviceName);
string signatureVersion = null;
if (rule["signature-version"] != null)
{
signatureVersion = rule["signature-version"].ToString();
}
string authRegion;
if (rule["auth-region"] != null)
{
authRegion = rule["auth-region"].ToString();
}
else
{
authRegion = Amazon.Util.AWSSDKUtils.DetermineRegion(hostName);
}
if (string.Equals(authRegion, this.SystemName, StringComparison.OrdinalIgnoreCase))
{
authRegion = null;
}
// v2 doesn't support the 'deprecated' property
var deprecated = false;
return(new Amazon.RegionEndpoint.Endpoint(hostName, authRegion, signatureVersion, deprecated));
}
