Github user adamonduty commented on the pull request:
https://github.com/apache/nifi/pull/256#issuecomment-220109946
@rstjohn I agree with @alopresto - the webhook is sensitive. Especially
because the links and content posted on slack are generally internal to teams
and trusted, inadvertently exposing a webhook URL could leave teams open to
phishing attacks. And possession of a webhook URL allows one to post to *any*
public channel or direct message any user.
You have a great point about the validator - it should validate *after* the
expression language has been applied to allow for use cases like you describe.
I'm a bit on the fence on assuming a name without a `#` is a channel name
though.
We could also expose the `attachments` section. Did you envision a property
where you could supply a json array as described in <a
href="https://api.slack.com/docs/attachments">Slack's documentation</a>? Or did
you have another approach in mind?
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