Presigned URL generation for Neptune and DocDB CopyDBClusterSnapshot …

…& CreateDBCluster (#3782)

CHANGELOG_PENDING.md

@@ -1,5 +1,7 @@
 ### SDK Features
 
 ### SDK Enhancements
+* `service/neptune`: Support for PreSignedUrl generation for CopyDBClusterSnapshot and CreateDBCluster operations. ([#3782](https://github.com/aws/aws-sdk-go/pull/3782))
+* `service/docdb`: Support for PreSignedUrl generation for CopyDBClusterSnapshot and CreateDBCluster operations. ([#3782](https://github.com/aws/aws-sdk-go/pull/3782))
 
 ### SDK Bugs

private/model/api/customization_passes.go

@@ -49,6 +49,8 @@ func (a *API) customizationPasses() error {
 		"s3control":  s3ControlCustomizations,
 		"cloudfront": cloudfrontCustomizations,
 		"rds":        rdsCustomizations,
+		"neptune":    neptuneCustomizations,
+		"docdb":      docdbCustomizations,
 
 		// Disable endpoint resolving for services that require customer
 		// to provide endpoint them selves.
@@ -327,7 +329,34 @@ func rdsCustomizations(a *API) error {
 		"CreateDBClusterInput",
 		"StartDBInstanceAutomatedBackupsReplicationInput",
 	}
-	for _, input := range inputs {
+	generatePresignedURL(a, inputs)
+	return nil
+}
+
+// neptuneCustomizations are customization for the service/neptune. This adds
+// non-modeled fields used for presigning.
+func neptuneCustomizations(a *API) error {
+	inputs := []string{
+		"CopyDBClusterSnapshotInput",
+		"CreateDBClusterInput",
+	}
+	generatePresignedURL(a, inputs)
+	return nil
+}
+
+// neptuneCustomizations are customization for the service/neptune. This adds
+// non-modeled fields used for presigning.
+func docdbCustomizations(a *API) error {
+	inputs := []string{
+		"CopyDBClusterSnapshotInput",
+		"CreateDBClusterInput",
+	}
+	generatePresignedURL(a, inputs)
+	return nil
+}
+
+func generatePresignedURL(a *API, inputShapes []string) {
+	for _, input := range inputShapes {
 		if ref, ok := a.Shapes[input]; ok {
 			ref.MemberRefs["SourceRegion"] = &ShapeRef{
 				Documentation: docstring(`SourceRegion is the source region where the resource exists. This is not sent over the wire and is only used for presigning. This value should always have the same region as the source ARN.`),
@@ -342,8 +371,6 @@ func rdsCustomizations(a *API) error {
 			}
 		}
 	}
-
-	return nil
 }
 
 func disableEndpointResolving(a *API) error {

service/docdb/customizations.go

@@ -0,0 +1,107 @@
+package docdb
+
+import (
+	"time"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/awsutil"
+	"github.com/aws/aws-sdk-go/aws/endpoints"
+	"github.com/aws/aws-sdk-go/aws/request"
+)
+
+func init() {
+	ops := []string{
+		opCopyDBClusterSnapshot,
+		opCreateDBCluster,
+	}
+	initRequest = func(r *request.Request) {
+		for _, operation := range ops {
+			if r.Operation.Name == operation {
+				r.Handlers.Build.PushFront(fillPresignedURL)
+			}
+		}
+	}
+}
+
+func fillPresignedURL(r *request.Request) {
+	fns := map[string]func(r *request.Request){
+		opCopyDBClusterSnapshot: copyDBClusterSnapshotPresign,
+		opCreateDBCluster:       createDBClusterPresign,
+	}
+	if !r.ParamsFilled() {
+		return
+	}
+	if f, ok := fns[r.Operation.Name]; ok {
+		f(r)
+	}
+}
+
+func copyDBClusterSnapshotPresign(r *request.Request) {
+	originParams := r.Params.(*CopyDBClusterSnapshotInput)
+
+	if originParams.SourceRegion == nil || originParams.PreSignedUrl != nil || originParams.DestinationRegion != nil {
+		return
+	}
+
+	originParams.DestinationRegion = r.Config.Region
+	// preSignedUrl is not required for instances in the same region.
+	if *originParams.SourceRegion == *originParams.DestinationRegion {
+		return
+	}
+
+	newParams := awsutil.CopyOf(r.Params).(*CopyDBClusterSnapshotInput)
+	originParams.PreSignedUrl = presignURL(r, originParams.SourceRegion, newParams)
+}
+
+func createDBClusterPresign(r *request.Request) {
+	originParams := r.Params.(*CreateDBClusterInput)
+
+	if originParams.SourceRegion == nil || originParams.PreSignedUrl != nil || originParams.DestinationRegion != nil {
+		return
+	}
+
+	originParams.DestinationRegion = r.Config.Region
+	// preSignedUrl is not required for instances in the same region.
+	if *originParams.SourceRegion == *originParams.DestinationRegion {
+		return
+	}
+
+	newParams := awsutil.CopyOf(r.Params).(*CreateDBClusterInput)
+	originParams.PreSignedUrl = presignURL(r, originParams.SourceRegion, newParams)
+}
+
+// presignURL will presign the request by using SoureRegion to sign with. SourceRegion is not
+// sent to the service, and is only used to not have the SDKs parsing ARNs.
+func presignURL(r *request.Request, sourceRegion *string, newParams interface{}) *string {
+	cfg := r.Config.Copy(aws.NewConfig().
+		WithEndpoint("").
+		WithRegion(aws.StringValue(sourceRegion)))
+
+	clientInfo := r.ClientInfo
+	resolved, err := r.Config.EndpointResolver.EndpointFor(
+		EndpointsID, aws.StringValue(cfg.Region),
+		func(opt *endpoints.Options) {
+			opt.DisableSSL = aws.BoolValue(cfg.DisableSSL)
+			opt.UseDualStack = aws.BoolValue(cfg.UseDualStack)
+		},
+	)
+	if err != nil {
+		r.Error = err
+		return nil
+	}
+
+	clientInfo.Endpoint = resolved.URL
+	clientInfo.SigningRegion = resolved.SigningRegion
+
+	// Presign a request with modified params
+	req := request.New(*cfg, clientInfo, r.Handlers, r.Retryer, r.Operation, newParams, r.Data)
+	req.Operation.HTTPMethod = "GET"
+	uri, err := req.Presign(5 * time.Minute) // 5 minutes should be enough.
+	if err != nil {                          // bubble error back up to original request
+		r.Error = err
+		return nil
+	}
+
+	// We have our URL, set it on params
+	return &uri
+}