Add S3-compatible storage backend

internal/config/defaults.go

@@ -22,6 +22,8 @@ const (
 	TransformModeSidecar = "sidecar"
 )
 
+const DefaultS3Region = "us-east-1"
+
 func ApplyDefaults(cfg *Config) {
 	for pipelineIndex := range cfg.Pipelines {
 		pipeline := &cfg.Pipelines[pipelineIndex]
@@ -60,6 +62,9 @@ func applyBackendDefaults(backend *Backend) {
 			backend.SSH.HostKeyPolicy = HostKeyPolicyAcceptNew
 		}
 	}
+	if backend.Backend == BackendS3 {
+		applyS3Defaults(&backend.Region, &backend.Prefix, &backend.ForcePath)
+	}
 }
 
 func applyDestinationDefaults(destination *Destination) {
@@ -71,4 +76,18 @@ func applyDestinationDefaults(destination *Destination) {
 			destination.SSH.HostKeyPolicy = HostKeyPolicyAcceptNew
 		}
 	}
+	if destination.Backend == BackendS3 {
+		applyS3Defaults(&destination.Region, &destination.Prefix, &destination.ForcePath)
+	}
+}
+
+func applyS3Defaults(region, prefix *string, forcePath **bool) {
+	if *region == "" {
+		*region = DefaultS3Region
+	}
+	*prefix = NormalizeS3Prefix(*prefix)
+	if *forcePath == nil {
+		defaultForcePath := true
+		*forcePath = &defaultForcePath
+	}
 }