# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb 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 Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

import hashlib

from cubicweb.predicates import has_related_entities

from cubicweb.web.views.ajaxcontroller import ajaxfunc

from cubicweb.web.views.ibreadcrumbs import IBreadCrumbsAdapter

def _recursive_replace_stream_by_md5(tree):

    """ Search for streams (i.e. object that have a 'read' method) in a tree

    (whose branches are lists or tuples), and substitute them by their md5 hash,

    leaving other leafs identical. A copy of the tree with only lists as

    branches is returned.

    """

    if not isinstance(tree, (list, tuple)):

        if hasattr(tree, 'read'):

            return hashlib.md5(tree.read()).hexdigest()

        return tree

    else:

        return [_recursive_replace_stream_by_md5(value)

                for value in tree]            

@ajaxfunc(output_type='json')

def fileupload(self):

    """ Return a json copy of the web request form in which uploaded files

    are read and the received streams are replaced by their md5 hash.

    """

    try:

        result_dict = {}

        for key, value in self._cw.form.items():

            result_dict[key] = _recursive_replace_stream_by_md5(value)

        return result_dict

    except Exception as ex:

        import traceback as tb

        tb.print_exc(ex)

class FolderIBreadCrumbsAdapter(IBreadCrumbsAdapter):

    __select__ = IBreadCrumbsAdapter.__select__ & has_related_entities('filed_under')

    def parent_entity(self):

        return self.entity.filed_under[0]