115 lines
4.0 KiB
Python
115 lines
4.0 KiB
Python
"""
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Module for checking permissions with the comment_client backend
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"""
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import logging
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from django.core import cache
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CACHE = cache.get_cache('default')
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CACHE_LIFESPAN = 60
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def cached_has_permission(user, permission, course_id=None):
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"""
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Call has_permission if it's not cached. A change in a user's role or
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a role's permissions will only become effective after CACHE_LIFESPAN seconds.
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"""
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key = "permission_%d_%s_%s" % (user.id, str(course_id), permission)
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val = CACHE.get(key, None)
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if val not in [True, False]:
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val = has_permission(user, permission, course_id=course_id)
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CACHE.set(key, val, CACHE_LIFESPAN)
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return val
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def has_permission(user, permission, course_id=None):
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for role in user.roles.filter(course_id=course_id):
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if role.has_permission(permission):
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return True
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return False
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CONDITIONS = ['is_open', 'is_author']
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def check_condition(user, condition, course_id, data):
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def check_open(user, condition, course_id, data):
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try:
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return data and not data['content']['closed']
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except KeyError:
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return False
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def check_author(user, condition, course_id, data):
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try:
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return data and data['content']['user_id'] == str(user.id)
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except KeyError:
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return False
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handlers = {
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'is_open': check_open,
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'is_author': check_author,
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}
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return handlers[condition](user, condition, course_id, data)
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def check_conditions_permissions(user, permissions, course_id, **kwargs):
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"""
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Accepts a list of permissions and proceed if any of the permission is valid.
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Note that ["can_view", "can_edit"] will proceed if the user has either
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"can_view" or "can_edit" permission. To use AND operator in between, wrap them in
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a list.
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"""
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def test(user, per, operator="or"):
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if isinstance(per, basestring):
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if per in CONDITIONS:
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return check_condition(user, per, course_id, kwargs)
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return cached_has_permission(user, per, course_id=course_id)
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elif isinstance(per, list) and operator in ["and", "or"]:
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results = [test(user, x, operator="and") for x in per]
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if operator == "or":
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return True in results
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elif operator == "and":
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return not False in results
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return test(user, permissions, operator="or")
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VIEW_PERMISSIONS = {
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'update_thread': ['edit_content', ['update_thread', 'is_open', 'is_author']],
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'create_comment': [["create_comment", "is_open"]],
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'delete_thread': ['delete_thread', ['update_thread', 'is_author']],
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'update_comment': ['edit_content', ['update_comment', 'is_open', 'is_author']],
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'endorse_comment': ['endorse_comment'],
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'openclose_thread': ['openclose_thread'],
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'create_sub_comment': [['create_sub_comment', 'is_open']],
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'delete_comment': ['delete_comment', ['update_comment', 'is_open', 'is_author']],
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'vote_for_comment': [['vote', 'is_open']],
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'undo_vote_for_comment': [['unvote', 'is_open']],
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'vote_for_thread': [['vote', 'is_open']],
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'flag_abuse_for_thread': [['vote', 'is_open']],
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'un_flag_abuse_for_thread': [['vote', 'is_open']],
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'flag_abuse_for_comment': [['vote', 'is_open']],
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'un_flag_abuse_for_comment': [['vote', 'is_open']],
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'undo_vote_for_thread': [['unvote', 'is_open']],
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'pin_thread': ['create_comment'],
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'un_pin_thread': ['create_comment'],
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'follow_thread': ['follow_thread'],
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'follow_commentable': ['follow_commentable'],
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'follow_user': ['follow_user'],
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'unfollow_thread': ['unfollow_thread'],
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'unfollow_commentable': ['unfollow_commentable'],
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'unfollow_user': ['unfollow_user'],
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'create_thread': ['create_thread'],
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'update_moderator_status': ['manage_moderator'],
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}
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def check_permissions_by_view(user, course_id, content, name):
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try:
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p = VIEW_PERMISSIONS[name]
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except KeyError:
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logging.warning("Permission for view named %s does not exist in permissions.py" % name)
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return check_conditions_permissions(user, p, course_id, content=content)
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