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# Copyright (c) 2011,  2012 Free Software Foundation

#     This program is free software: you can redistribute it and/or modify
#     it under the terms of the GNU Affero General Public License as
#     published by the Free Software Foundation, either version 3 of the
#     License, or (at your option) any later version.

#     This program is distributed in the hope that it will be useful,
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#     GNU Affero General Public License for more details.

#     You should have received a copy of the GNU Affero General Public License
#     along with this program.  If not, see <http://www.gnu.org/licenses/>.


# This project incorporates work covered by the following copyright and permission notice:  

#    Copyright (c) 2009, Julien Fache
#    All rights reserved.

#    Redistribution and use in source and binary forms, with or without
#    modification, are permitted provided that the following conditions
#    are met:

#    * Redistributions of source code must retain the above copyright
#      notice, this list of conditions and the following disclaimer.
#    * Redistributions in binary form must reproduce the above copyright
#      notice, this list of conditions and the following disclaimer in
#      the documentation and/or other materials provided with the
#      distribution.
#    * Neither the name of the author nor the names of other
#      contributors may be used to endorse or promote products derived
#      from this software without specific prior written permission.

#    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
#    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
#    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
#    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
#    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
#    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
#    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
#    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
#    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
#    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
#    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
#    OF THE POSSIBILITY OF SUCH DAMAGE.

# Copyright (c) 2011,  2012 Free Software Foundation

#     This program is free software: you can redistribute it and/or modify
#     it under the terms of the GNU Affero General Public License as
#     published by the Free Software Foundation, either version 3 of the
#     License, or (at your option) any later version.

#     This program is distributed in the hope that it will be useful,
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#     GNU Affero General Public License for more details.

#     You should have received a copy of the GNU Affero General Public License
#     along with this program.  If not, see <http://www.gnu.org/licenses/>.




"""TypePad spam checker backend for Gstudio"""
from django.conf import settings
from django.utils.encoding import smart_str
from django.contrib.sites.models import Site
from django.core.exceptions import ImproperlyConfigured

from gstudio.settings import PROTOCOL

try:
    from akismet import Akismet
    from akismet import APIKeyError
except ImportError:
    raise ImproperlyConfigured('akismet module is not available')

if not getattr(settings, 'TYPEPAD_SECRET_API_KEY', ''):
    raise ImproperlyConfigured('You have to set TYPEPAD_SECRET_API_KEY')

TYPEPAD_API_KEY = settings.TYPEPAD_SECRET_API_KEY


class TypePad(Akismet):
    """TypePad version of the Akismet module"""
    baseurl = 'api.antispam.typepad.com/1.1/'


def backend(comment, content_object, request):
    """TypePad spam checker backend for Gstudio"""
    blog_url = '%s://%s/' % (PROTOCOL, Site.objects.get_current().domain)

    typepad = TypePad(key=TYPEPAD_API_KEY, blog_url=blog_url)

    if not typepad.verify_key():
        raise APIKeyError('Your Typepad API key is invalid.')

    typepad_data = {
        'user_ip': request.META.get('REMOTE_ADDR', ''),
        'user_agent': request.META.get('HTTP_USER_AGENT', ''),
        'referrer': request.META.get('HTTP_REFERER', 'unknown'),
        'permalink': content_object.get_absolute_url(),
        'comment_type': 'comment',
        'comment_author': smart_str(comment.userinfo.get('name', '')),
        'comment_author_email': smart_str(comment.userinfo.get('email', '')),
        'comment_author_url': smart_str(comment.userinfo.get('url', '')),
    }
    is_spam = typepad.comment_check(smart_str(comment.comment),
                                    data=typepad_data, build_data=True)
    return is_spam