cloudevents / cloudevents/sdk-python
CloudEvent serializes invalid extension attribute names without validation
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- Python
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Description
CloudEvent serializes invalid extension attribute names without validation
Repro:
from cloudevents.v1.http import CloudEvent
from cloudevents.v1.conversion import to_structured
event = CloudEvent(
{
"type": "example.event",
"source": "/test",
"example-extension": "123",
},
{"ok": True},
)
_, body = to_structured(event)
print(body)
Expected: construction or serialization rejects example-extension, because CloudEvents attribute names must only contain lowercase ASCII letters and digits.
Actual: the SDK serializes it successfully, producing an invalid CloudEvent. This can fail at runtime with stricter receivers such as Knative Eventing, which rejects the request with 400 Bad Request.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with CloudEvent construction and the conversion.to_structured entry point shown in the repro, then trace where extension attributes are serialized. Re-run the provided example to confirm that names containing characters such as the hyphen are rejected, while valid lowercase-letter and digit names continue to serialize.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- api
- Issue type
- Bug
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 68/100