feat(webdav): support range get

pkg/gowebdav/errors.go

@@ -0,0 +1,49 @@
+package gowebdav
+
+import (
+	"fmt"
+	"os"
+)
+
+// StatusError implements error and wraps
+// an erroneous status code.
+type StatusError struct {
+	Status int
+}
+
+func (se StatusError) Error() string {
+	return fmt.Sprintf("%d", se.Status)
+}
+
+// IsErrCode returns true if the given error
+// is an os.PathError wrapping a StatusError
+// with the given status code.
+func IsErrCode(err error, code int) bool {
+	if pe, ok := err.(*os.PathError); ok {
+		se, ok := pe.Err.(StatusError)
+		return ok && se.Status == code
+	}
+	return false
+}
+
+// IsErrNotFound is shorthand for IsErrCode
+// for status 404.
+func IsErrNotFound(err error) bool {
+	return IsErrCode(err, 404)
+}
+
+func newPathError(op string, path string, statusCode int) error {
+	return &os.PathError{
+		Op:   op,
+		Path: path,
+		Err:  StatusError{statusCode},
+	}
+}
+
+func newPathErrorErr(op string, path string, err error) error {
+	return &os.PathError{
+		Op:   op,
+		Path: path,
+		Err:  err,
+	}
+}