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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/>.
from functools import wraps
from urlparse import urljoin
from werkzeug.exceptions import Forbidden, NotFound
from werkzeug.urls import url_quote
from mediagoblin import mg_globals as mgg
from mediagoblin.db.models import MediaEntry, User
from mediagoblin.tools.response import redirect, render_404
def require_active_login(controller):
"""
Require an active login from the user.
"""
@wraps(controller)
def new_controller_func(request, *args, **kwargs):
if request.user and \
request.user.status == u'needs_email_verification':
return redirect(
request, 'mediagoblin.user_pages.user_home',
user=request.user.username)
elif not request.user or request.user.status != u'active':
next_url = urljoin(
request.urlgen('mediagoblin.auth.login',
qualified=True),
request.url)
return redirect(request, 'mediagoblin.auth.login',
next=url_quote(next_url))
return controller(request, *args, **kwargs)
return new_controller_func
def active_user_from_url(controller):
"""Retrieve User() from <user> URL pattern and pass in as url_user=...
Returns a 404 if no such active user has been found"""
@wraps(controller)
def wrapper(request, *args, **kwargs):
user = User.query.filter_by(username=request.matchdict['user']).first()
if user is None:
return render_404(request)
return controller(request, *args, url_user=user, **kwargs)
return wrapper
def user_may_delete_media(controller):
"""
Require user ownership of the MediaEntry to delete.
"""
@wraps(controller)
def wrapper(request, *args, **kwargs):
uploader_id = kwargs['media'].uploader
if not (request.user.is_admin or
request.user.id == uploader_id):
raise Forbidden()
return controller(request, *args, **kwargs)
return wrapper
def user_may_alter_collection(controller):
"""
Require user ownership of the Collection to modify.
"""
@wraps(controller)
def wrapper(request, *args, **kwargs):
creator_id = request.db.User.find_one(
{'username': request.matchdict['user']}).id
if not (request.user.is_admin or
request.user.id == creator_id):
raise Forbidden()
return controller(request, *args, **kwargs)
return wrapper
def uses_pagination(controller):
"""
Check request GET 'page' key for wrong values
"""
@wraps(controller)
def wrapper(request, *args, **kwargs):
try:
page = int(request.GET.get('page', 1))
if page < 0:
return render_404(request)
except ValueError:
return render_404(request)
return controller(request, page=page, *args, **kwargs)
return wrapper
def get_user_media_entry(controller):
"""
Pass in a MediaEntry based off of a url component
"""
@wraps(controller)
def wrapper(request, *args, **kwargs):
user = User.query.filter_by(username=request.matchdict['user']).first()
if not user:
raise NotFound()
media = MediaEntry.query.filter_by(
slug = request.matchdict['media'],
state = u'processed',
uploader = user.id).first()
if not media:
# no media via slug? Grab it via object id
try:
media = MediaEntry.query.filter_by(
id = int(request.matchdict['media']),
state = u'processed',
uploader = user.id).first()
except ValueError:
# media "id" was no int
raise NotFound()
if not media:
# no media by that id? Okay, 404.
raise NotFound()
return controller(request, media=media, *args, **kwargs)
return wrapper
def get_user_collection(controller):
"""
Pass in a Collection based off of a url component
"""
@wraps(controller)
def wrapper(request, *args, **kwargs):
user = request.db.User.find_one(
{'username': request.matchdict['user']})
if not user:
return render_404(request)
collection = request.db.Collection.find_one(
{'slug': request.matchdict['collection'],
'creator': user.id})
# Still no collection? Okay, 404.
if not collection:
return render_404(request)
return controller(request, collection=collection, *args, **kwargs)
return wrapper
def get_user_collection_item(controller):
"""
Pass in a CollectionItem based off of a url component
"""
@wraps(controller)
def wrapper(request, *args, **kwargs):
user = request.db.User.find_one(
{'username': request.matchdict['user']})
if not user:
return render_404(request)
collection_item = request.db.CollectionItem.find_one(
{'id': request.matchdict['collection_item'] })
# Still no collection item? Okay, 404.
if not collection_item:
return render_404(request)
return controller(request, collection_item=collection_item, *args, **kwargs)
return wrapper
def get_media_entry_by_id(controller):
"""
Pass in a MediaEntry based off of a url component
"""
@wraps(controller)
def wrapper(request, *args, **kwargs):
media = MediaEntry.query.filter_by(
id=request.matchdict['media_id'],
state=u'processed').first()
# Still no media? Okay, 404.
if not media:
return render_404(request)
given_username = request.matchdict.get('user')
if given_username and (given_username != media.get_uploader.username):
return render_404(request)
return controller(request, media=media, *args, **kwargs)
return wrapper
def get_workbench(func):
"""Decorator, passing in a workbench as kwarg which is cleaned up afterwards"""
@wraps(func)
def new_func(*args, **kwargs):
with mgg.workbench_manager.create() as workbench:
return func(*args, workbench=workbench, **kwargs)
return new_func
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