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endpoint.go
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endpoint.go
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package s3
import (
"net/url"
"strings"
"github.com/aws/aws-sdk-go/aws"
awsarn "github.com/aws/aws-sdk-go/aws/arn"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/endpoints"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/private/protocol"
"github.com/aws/aws-sdk-go/service/s3/internal/arn"
)
// Used by shapes with members decorated as endpoint ARN.
func parseEndpointARN(v string) (arn.Resource, error) {
return arn.ParseResource(v, accessPointResourceParser)
}
func accessPointResourceParser(a awsarn.ARN) (arn.Resource, error) {
resParts := arn.SplitResource(a.Resource)
switch resParts[0] {
case "accesspoint":
return arn.ParseAccessPointResource(a, resParts[1:])
default:
return nil, arn.InvalidARNError{ARN: a, Reason: "unknown resource type"}
}
}
func endpointHandler(req *request.Request) {
endpoint, ok := req.Params.(endpointARNGetter)
if !ok || !endpoint.hasEndpointARN() {
updateBucketEndpointFromParams(req)
return
}
resource, err := endpoint.getEndpointARN()
if err != nil {
req.Error = newInvalidARNError(nil, err)
return
}
resReq := resourceRequest{
Resource: resource,
Request: req,
}
if resReq.IsCrossPartition() {
req.Error = newClientPartitionMismatchError(resource,
req.ClientInfo.PartitionID, aws.StringValue(req.Config.Region), nil)
return
}
if !resReq.AllowCrossRegion() && resReq.IsCrossRegion() {
req.Error = newClientRegionMismatchError(resource,
req.ClientInfo.PartitionID, aws.StringValue(req.Config.Region), nil)
return
}
if resReq.HasCustomEndpoint() {
req.Error = newInvalidARNWithCustomEndpointError(resource, nil)
return
}
switch tv := resource.(type) {
case arn.AccessPointARN:
err = updateRequestAccessPointEndpoint(req, tv)
if err != nil {
req.Error = err
}
default:
req.Error = newInvalidARNError(resource, nil)
}
}
type resourceRequest struct {
Resource arn.Resource
Request *request.Request
}
func (r resourceRequest) ARN() awsarn.ARN {
return r.Resource.GetARN()
}
func (r resourceRequest) AllowCrossRegion() bool {
return aws.BoolValue(r.Request.Config.S3UseARNRegion)
}
func (r resourceRequest) UseFIPS() bool {
return isFIPS(aws.StringValue(r.Request.Config.Region))
}
func (r resourceRequest) IsCrossPartition() bool {
return r.Request.ClientInfo.PartitionID != r.Resource.GetARN().Partition
}
func (r resourceRequest) IsCrossRegion() bool {
return isCrossRegion(r.Request, r.Resource.GetARN().Region)
}
func (r resourceRequest) HasCustomEndpoint() bool {
return len(aws.StringValue(r.Request.Config.Endpoint)) > 0
}
func isFIPS(clientRegion string) bool {
return strings.HasPrefix(clientRegion, "fips-") || strings.HasSuffix(clientRegion, "-fips")
}
func isCrossRegion(req *request.Request, otherRegion string) bool {
return req.ClientInfo.SigningRegion != otherRegion
}
func updateBucketEndpointFromParams(r *request.Request) {
bucket, ok := bucketNameFromReqParams(r.Params)
if !ok {
// Ignore operation requests if the bucket name was not provided
// if this is an input validation error the validation handler
// will report it.
return
}
updateEndpointForS3Config(r, bucket)
}
func updateRequestAccessPointEndpoint(req *request.Request, accessPoint arn.AccessPointARN) error {
// Accelerate not supported
if aws.BoolValue(req.Config.S3UseAccelerate) {
return newClientConfiguredForAccelerateError(accessPoint,
req.ClientInfo.PartitionID, aws.StringValue(req.Config.Region), nil)
}
// Ignore the disable host prefix for access points since custom endpoints
// are not supported.
req.Config.DisableEndpointHostPrefix = aws.Bool(false)
if err := accessPointEndpointBuilder(accessPoint).Build(req); err != nil {
return err
}
removeBucketFromPath(req.HTTPRequest.URL)
return nil
}
func removeBucketFromPath(u *url.URL) {
u.Path = strings.Replace(u.Path, "/{Bucket}", "", -1)
if u.Path == "" {
u.Path = "/"
}
}
type accessPointEndpointBuilder arn.AccessPointARN
const (
accessPointPrefixLabel = "accesspoint"
accountIDPrefixLabel = "accountID"
accesPointPrefixTemplate = "{" + accessPointPrefixLabel + "}-{" + accountIDPrefixLabel + "}."
)
func (a accessPointEndpointBuilder) Build(req *request.Request) error {
resolveRegion := arn.AccessPointARN(a).Region
cfgRegion := aws.StringValue(req.Config.Region)
if isFIPS(cfgRegion) {
if aws.BoolValue(req.Config.S3UseARNRegion) && isCrossRegion(req, resolveRegion) {
// FIPS with cross region is not supported, the SDK must fail
// because there is no well defined method for SDK to construct a
// correct FIPS endpoint.
return newClientConfiguredForCrossRegionFIPSError(arn.AccessPointARN(a),
req.ClientInfo.PartitionID, cfgRegion, nil)
}
resolveRegion = cfgRegion
}
endpoint, err := resolveRegionalEndpoint(req, resolveRegion)
if err != nil {
return newFailedToResolveEndpointError(arn.AccessPointARN(a),
req.ClientInfo.PartitionID, cfgRegion, err)
}
if err = updateRequestEndpoint(req, endpoint.URL); err != nil {
return err
}
const serviceEndpointLabel = "s3-accesspoint"
// dualstack provided by endpoint resolver
cfgHost := req.HTTPRequest.URL.Host
if strings.HasPrefix(cfgHost, "s3") {
req.HTTPRequest.URL.Host = serviceEndpointLabel + cfgHost[2:]
}
protocol.HostPrefixBuilder{
Prefix: accesPointPrefixTemplate,
LabelsFn: a.hostPrefixLabelValues,
}.Build(req)
req.ClientInfo.SigningName = endpoint.SigningName
req.ClientInfo.SigningRegion = endpoint.SigningRegion
err = protocol.ValidateEndpointHost(req.Operation.Name, req.HTTPRequest.URL.Host)
if err != nil {
return newInvalidARNError(arn.AccessPointARN(a), err)
}
return nil
}
func (a accessPointEndpointBuilder) hostPrefixLabelValues() map[string]string {
return map[string]string{
accessPointPrefixLabel: arn.AccessPointARN(a).AccessPointName,
accountIDPrefixLabel: arn.AccessPointARN(a).AccountID,
}
}
func resolveRegionalEndpoint(r *request.Request, region string) (endpoints.ResolvedEndpoint, error) {
return r.Config.EndpointResolver.EndpointFor(EndpointsID, region, func(opts *endpoints.Options) {
opts.DisableSSL = aws.BoolValue(r.Config.DisableSSL)
opts.UseDualStack = aws.BoolValue(r.Config.UseDualStack)
opts.S3UsEast1RegionalEndpoint = endpoints.RegionalS3UsEast1Endpoint
})
}
func updateRequestEndpoint(r *request.Request, endpoint string) (err error) {
endpoint = endpoints.AddScheme(endpoint, aws.BoolValue(r.Config.DisableSSL))
r.HTTPRequest.URL, err = url.Parse(endpoint + r.Operation.HTTPPath)
if err != nil {
return awserr.New(request.ErrCodeSerialization,
"failed to parse endpoint URL", err)
}
return nil
}