cleanup: move pkg/ to internal/

The internal/ directory in Go has a special meaning, and indicates that
those packages are not meant for external consumption. Ceph-CSI does
provide public APIs for other projects to consume. There is no plan to
keep the API of the internally used packages stable.

Closes: #903
Signed-off-by: Niels de Vos <ndevos@redhat.com>

internal/util/validate.go

@@ -0,0 +1,80 @@
+package util
+
+import (
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+// ValidateNodeStageVolumeRequest validates the node stage request
+func ValidateNodeStageVolumeRequest(req *csi.NodeStageVolumeRequest) error {
+	if req.GetVolumeCapability() == nil {
+		return status.Error(codes.InvalidArgument, "volume capability missing in request")
+	}
+
+	if req.GetVolumeId() == "" {
+		return status.Error(codes.InvalidArgument, "volume ID missing in request")
+	}
+
+	if req.GetStagingTargetPath() == "" {
+		return status.Error(codes.InvalidArgument, "staging target path missing in request")
+	}
+
+	if req.GetSecrets() == nil || len(req.GetSecrets()) == 0 {
+		return status.Error(codes.InvalidArgument, "stage secrets cannot be nil or empty")
+	}
+
+	// validate stagingpath exists
+	ok := checkDirExists(req.GetStagingTargetPath())
+	if !ok {
+		return status.Error(codes.InvalidArgument, "staging path does not exists on node")
+	}
+	return nil
+}
+
+// ValidateNodeUnstageVolumeRequest validates the node unstage request
+func ValidateNodeUnstageVolumeRequest(req *csi.NodeUnstageVolumeRequest) error {
+	if req.GetVolumeId() == "" {
+		return status.Error(codes.InvalidArgument, "volume ID missing in request")
+	}
+
+	if req.GetStagingTargetPath() == "" {
+		return status.Error(codes.InvalidArgument, "staging target path missing in request")
+	}
+
+	return nil
+}
+
+// ValidateNodePublishVolumeRequest validates the node publish request
+func ValidateNodePublishVolumeRequest(req *csi.NodePublishVolumeRequest) error {
+	if req.GetVolumeCapability() == nil {
+		return status.Error(codes.InvalidArgument, "volume capability missing in request")
+	}
+
+	if req.GetVolumeId() == "" {
+		return status.Error(codes.InvalidArgument, "volume ID missing in request")
+	}
+
+	if req.GetTargetPath() == "" {
+		return status.Error(codes.InvalidArgument, "target path missing in request")
+	}
+
+	if req.GetStagingTargetPath() == "" {
+		return status.Error(codes.InvalidArgument, "staging target path missing in request")
+	}
+
+	return nil
+}
+
+// ValidateNodeUnpublishVolumeRequest validates the node unpublish request
+func ValidateNodeUnpublishVolumeRequest(req *csi.NodeUnpublishVolumeRequest) error {
+	if req.GetVolumeId() == "" {
+		return status.Error(codes.InvalidArgument, "volume ID missing in request")
+	}
+
+	if req.GetTargetPath() == "" {
+		return status.Error(codes.InvalidArgument, "target path missing in request")
+	}
+
+	return nil
+}