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# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
#
# 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/>.

import json
import logging
from mediagoblin.db.models import User

_log = logging.getLogger(__name__)


# MIME-Types
form_encoded = "application/x-www-form-urlencoded"
json_encoded = "application/json"


def setup_user_in_request(request):
    """
    Examine a request and tack on a request.user parameter if that's
    appropriate.
    """
    if 'user_id' not in request.session:
        request.user = None
        return

    request.user = User.query.get(request.session['user_id'])

    if not request.user:
        # Something's wrong... this user doesn't exist?  Invalidate
        # this session.
        _log.warn("Killing session for user id %r", request.session['user_id'])
        request.session.delete()

def decode_request(request):
    """ Decodes a request based on MIME-Type """
    data = request.get_data()
    
    if request.content_type == json_encoded:
        data = json.loads(data)
    elif request.content_type == form_encoded or request.content_type == "":
        data = request.form
    else:
        data = ""
    return data