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endpoint_provider.rb
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endpoint_provider.rb
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module Aws
# @api private
class EndpointProvider
# when sts_regional_endpoint set to `legacy`
# endpoint pattern stays global for
# following regions
STS_LEGACY_REGIONS = %w(
ap-northeast-1
ap-south-1
ap-southeast-1
ap-southeast-2
aws-global
ca-central-1
eu-central-1
eu-north-1
eu-west-1
eu-west-2
eu-west-3
sa-east-1
us-east-1
us-east-2
us-west-1
us-west-2
)
def initialize(rules)
@rules = rules
end
def resolve(region, service, sts_regional_endpoints = nil)
"https://" + endpoint_for(region, service, sts_regional_endpoints)
end
def signing_region(region, service)
get_partition(region).
fetch("services", {}).
fetch(service, {}).
fetch("endpoints", {}).
fetch(region, {}).
fetch("credentialScope", {}).
fetch("region", region)
end
def dns_suffix_for(region)
partition = get_partition(region)
partition['dnsSuffix']
end
private
def endpoint_for(region, service, sts_regional_endpoints)
partition = get_partition(region)
endpoint = default_endpoint(partition, service, region)
service_cfg = partition.fetch("services", {}).fetch(service, {})
# Check for service-level default endpoint.
endpoint = service_cfg.fetch("defaults", {}).fetch("hostname", endpoint)
# Check for sts legacy behavior
sts_legacy = service == 'sts' &&
sts_regional_endpoints == 'legacy' &&
STS_LEGACY_REGIONS.include?(region)
# Check for global endpoint.
if sts_legacy || service_cfg["isRegionalized"] == false
region = service_cfg.fetch("partitionEndpoint", region)
end
# Check for service/region level endpoint.
endpoint = service_cfg.fetch("endpoints", {}).
fetch(region, {}).fetch("hostname", endpoint)
endpoint
end
def default_endpoint(partition, service, region)
hostname_template = partition["defaults"]["hostname"]
hostname_template.
sub('{region}', region).
sub('{service}', service).
sub('{dnsSuffix}', partition["dnsSuffix"])
end
def get_partition(region)
partition_containing_region(region) ||
partition_matching_region(region) ||
default_partition
end
def partition_containing_region(region)
@rules['partitions'].find do |p|
p['regions'].key?(region)
end
end
def partition_matching_region(region)
@rules['partitions'].find do |p|
region.match(p["regionRegex"]) ||
p['services'].values.find { |svc| svc['endpoints'].key?(region) if svc.key? 'endpoints'}
end
end
def default_partition
@rules['partitions'].find { |p| p["partition"] == "aws" } ||
@rules['partitions'].first
end
class << self
def resolve(region, service, sts_regional_endpoints = nil)
default_provider.resolve(region, service, sts_regional_endpoints)
end
def signing_region(region, service)
default_provider.signing_region(region, service)
end
def dns_suffix_for(region)
default_provider.dns_suffix_for(region)
end
private
def default_provider
@default_provider ||= EndpointProvider.new(Partitions.defaults)
end
end
end
end