Map S3 regions to Google (multi)regions

cmd/gateway-gcs-layer.go

@@ -218,6 +218,26 @@ func (l *gcsGateway) MakeBucket(bucket string) error {
 func (l *gcsGateway) MakeBucketWithLocation(bucket, location string) error {
 	bkt := l.client.Bucket(bucket)
 
+	// this will map s3 regions to google multi regions
+	if v, ok := map[string]string{
+		"ap-northeast-1": "asia",
+		"ap-northeast-2": "asia",
+		"ap-south-1":     "asia",
+		"ap-southeast-1": "asia",
+		"ap-southeast-2": "asia",
+		"eu-central-1":   "eu",
+		"eu-west-1":      "eu",
+		"eu-west-2":      "eu",
+		"ca-central-1":   "us",
+		"sa-east-1":      "us",
+		"us-east-1":      "us",
+		"us-east-2":      "us",
+		"us-west-1":      "us",
+		"us-west-2":      "us",
+	}[location]; ok {
+		location = v
+	}
+
 	if err := bkt.Create(l.ctx, l.projectID, &storage.BucketAttrs{
 		Location: location,
 	}); err != nil {

cmd/gateway-main.go

@@ -179,6 +179,17 @@ const (
 	// Add more backends here.
 )
 
+// GatewayFn returns the GatewayLayer for the backend
+type GatewayFn func([]string) (GatewayLayer, error)
+
+var (
+	backends = map[gatewayBackend]GatewayFn{
+		azureBackend: newAzureLayer,
+		s3Backend:    newS3Gateway,
+		gcsBackend:   newGCSGateway,
+	}
+)
+
 // Returns access and secretkey set from environment variables.
 func mustGetGatewayConfigFromEnv() (string, string, string) {
 	// Fetch access keys from environment variables.