- when no credentials are passed it will try to get valid credentials
using the google metadata service
- this is a feature of the google SDK, so we don't need to handle that
explicitly
- previous behaviour with a credentials file is retained
Implement an Authenticator which can fulfill a dns-01 challenge using
the Google Cloud DNS API. Applicable only for domains using Google Cloud
DNS for DNS.
Testing Done:
* `tox -e py27`
* `tox -e lint`
* Manual testing:
* Used `certbot certonly --dns-google -d`, specifying a credentials
file as a command line argument. Verified that a certificate was
successfully obtained without user interaction.
* Used `certbot certonly --dns-google -d`, without specifying a
credentials file as a command line argument. Verified that the
user was prompted and that a certificate was successfully
obtained.
* Used `certbot certonly -d`. Verified that the user was prompted for
a credentials file after selecting google interactively and that
a certificate was successfully obtained.
* Used `certbot renew --force-renewal`. Verified that certificates
were renewed without user interaction.
* Negative testing:
* Path to non-existent credentials file.
* Credentials file with unsafe permissions (644).
* Domain name not registered to Google Cloud Platform account.
