Add support for the PowerDNS-Admin API

[tmuncks]

The PowerDNS-Admin project provides a PowerDNS compatible API that's scoped to allow an API KEY to access only specific, authenticated domains.

The only change needed to support this in certbot-dns-powerdns, is to accept a few new responses when guessing the zone name.

This PR adds support for this, and have been tested with all (3) available access roles from PowerDNS-Admin (User, Operator, Administrator).

[tmuncks]

This is pretty much functionally identical to #10 but works for all API roles in PowerDNS-Admin

[tmuncks]

For some reason the build fails after pushing an update to README.md. This is most likely a false positive, but please let me know if you need anything to get this merged. :-)

[tmuncks]

Updated the PR as I saw reverse proxy configurations changing the default gunicorn HTTP Status messages from eg. "FORBIDDEN" to "Forbidden" to better honor the RFCs. I have redone the check to use the status_code, which makes more sense since the textual representation is just another representation of the code anyway.

[michaelarnauts]

I can confirm that this change makes it work with the PowerDNS-Admin API. Thanks!

[Heshmatkhah]

Any Updates on this PR?

[komodin]

Hi, we encountered the same error when using the PowerDNS Admin API and I'm glad to found that someone encountered the same issue.

It will be really amazing if someone from @pan-net-security could take a quick look and merge it.

Sorry for the mention but maybe @splashx @beli-sk @mbag @matusf can help us with this.

Thanks in advance!

[tmuncks]

FWIW, I'm still using the same code in production in several places, with no issue since this PR was created.

[komodin]

I also know that we're able to manually build it or whatever, but as this project has the dns-powerdns name I think it will be nice to make it compatible with the tools that we use nowadays.