[1.4.0rc1] appkeys plugin: newly generated keys under Python 3 are binary and don't match provided strings

[foosel]

Problem

Newly generated appkeys api key:

admin:
- api_key: !!binary |
    OTdlNDNhNmMwODY2OWM3MTMzYmY2MDNmMjBkZmI1ZjE=
  app_id: test

Under Python 3 this gets loaded as a bytes instance b'97e43a6c08669c7133bf603f20dfb5f1' instead of the string instance '97e43a6c08669c7133bf603f20dfb5f1' that it should be. The reasons seems to be that we actually do generate a binary blob instead of a string, and the only reason that hasn't yet caused issues under Python 2 is that there str is bytes. Under Python 3 a comparison to '97e43a6c08669c7133bf603f20dfb5f1' as coming in via the API will fail/not match and thus the key will be invalid.

Solution

Generate strings, eg. by switching from hexlify(os.urandom(16)) to ''.join('%02X' % z for z in bytes(uuid.uuid4().bytes)) for key generation.

[foosel]

1.4.0rc2 is out.