1 files changed, 19 insertions, 0 deletions
diff --git a/cloudinit/sources/helpers/hetzner.py b/cloudinit/sources/helpers/hetzner.py
index 2554530d..72edb023 100644
--- a/cloudinit/sources/helpers/hetzner.py
+++ b/cloudinit/sources/helpers/hetzner.py
@@ -7,6 +7,9 @@ from cloudinit import log as logging
 from cloudinit import url_helper
 from cloudinit import util
 
+import base64
+import binascii
+
 LOG = logging.getLogger(__name__)
 
 
@@ -24,3 +27,19 @@ def read_userdata(url, timeout=2, sec_between=2, retries=30):
     if not response.ok():
         raise RuntimeError("unable to read userdata at %s" % url)
     return response.contents
+
+
+def maybe_b64decode(data: bytes) -> bytes:
+    """base64 decode data
+
+    If data is base64 encoded bytes, return b64decode(data).
+    If not, return data unmodified.
+
+    @param data: data as bytes. TypeError is raised if not bytes.
+    """
+    if not isinstance(data, bytes):
+        raise TypeError("data is '%s', expected bytes" % type(data))
+    try:
+        return base64.b64decode(data, validate=True)
+    except binascii.Error:
+        return data