###
# Copyright (c) 2012-2021, Valentin Lorentz
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# modification, are permitted provided that the following conditions are met:
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#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions, and the following disclaimer.
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#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
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###

import os

import supybot.log as log
import supybot.conf as conf

found_gnupg_lib = False
found_gnupg_bin = False
try:
    import gnupg
except ImportError:
    # As we do not want Supybot to depend on GnuPG, we will use it only if
    # it is available. Otherwise, we just don't allow user auth through GPG.
    log.debug('Cannot import gnupg, disabling GPG support.')
    gnupg = None
try:
    if gnupg:
        gnupg.GPG(gnupghome=None)
        found_gnupg_lib = found_gnupg_bin = True
except TypeError:
    # This is the 'gnupg' library, not 'python-gnupg'.
    gnupg = None
    log.error('Cannot use GPG. gnupg (a Python package) is installed, '
              'but python-gnupg (an other Python package) should be '
              'installed instead.')
except OSError:
    gnupg = None
    found_gnupg_lib = True
    log.error('Cannot use GPG. python-gnupg is installed but cannot '
              'find the gnupg executable.')


available = (gnupg is not None)

def loadKeyring():
    if not available:
        return
    global keyring
    path = os.path.abspath(conf.supybot.directories.data.dirize('GPGkeyring'))
    if not os.path.isdir(path):
        log.info('Creating directory %s' % path)
        os.mkdir(path, 0o700)
    assert os.path.isdir(path)
    keyring = gnupg.GPG(gnupghome=path)
loadKeyring()

# Reload the keyring if path changed
conf.supybot.directories.data.addCallback(loadKeyring)
