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# Copyright (C) 2011-2014 Aleksey Lim
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import re
import time
import logging
from contextlib import contextmanager
from sugar_network import toolkit
from sugar_network.db import blobs
from sugar_network.db.metadata import Aggregated
from sugar_network.toolkit.router import ACL, File
from sugar_network.toolkit.router import route, preroute, fallbackroute
from sugar_network.toolkit.coroutine import this
from sugar_network.toolkit import http, enforce
_GUID_RE = re.compile('[a-zA-Z0-9_+-.]+$')
_logger = logging.getLogger('db.routes')
class Routes(object):
def __init__(self, volume, find_limit=None):
self.volume = volume
self._find_limit = find_limit
this.volume = self.volume
@preroute
def __preroute__(self, op, request, response):
this.request = request
this.response = response
@route('POST', [None], acl=ACL.AUTH, mime_type='application/json')
def create(self, request):
with self._post(request, ACL.CREATE) as doc:
self.on_create(request, doc.props)
self.volume[request.resource].create(doc.props)
self.after_post(doc)
return doc['guid']
@route('GET', [None],
arguments={
'offset': int,
'limit': int,
'layer': [],
'reply': ('guid',),
},
mime_type='application/json')
def find(self, request, reply, limit, layer):
self._preget(request)
if self._find_limit:
if limit <= 0:
request['limit'] = self._find_limit
elif limit > self._find_limit:
_logger.warning('The find limit is restricted to %s',
self._find_limit)
request['limit'] = self._find_limit
if 'deleted' in layer:
_logger.warning('Requesting "deleted" layer, will ignore')
layer.remove('deleted')
documents, total = self.volume[request.resource].find(
not_layer='deleted', **request)
result = [self._postget(request, i, reply) for i in documents]
return {'total': total, 'result': result}
@route('GET', [None, None], cmd='exists', mime_type='application/json')
def exists(self, request):
directory = self.volume[request.resource]
return directory.exists(request.guid)
@route('PUT', [None, None], acl=ACL.AUTH | ACL.AUTHOR)
def update(self, request):
with self._post(request, ACL.WRITE) as doc:
if not doc.props:
return
self.on_update(request, doc.props)
self.volume[request.resource].update(doc.guid, doc.props)
self.after_post(doc)
@route('GET', [None, None], cmd='diff', mime_type='application/json')
def diff(self, request):
result = {}
res = self.volume[request.resource][request.guid]
for prop, meta, __ in res.diff(toolkit.Sequence([[0, None]])):
result[prop] = meta
return result
@route('PUT', [None, None, None], acl=ACL.AUTH | ACL.AUTHOR)
def update_prop(self, request):
if request.content is None:
value = request.content_stream
else:
value = request.content
request.content = {request.prop: value}
self.update(request)
@route('DELETE', [None, None], acl=ACL.AUTH | ACL.AUTHOR)
def delete(self, request):
# Node data should not be deleted immediately
# to make master-slave synchronization possible
request.content = {'layer': 'deleted'}
self.update(request)
@route('GET', [None, None], arguments={'reply': list},
mime_type='application/json')
def get(self, request, reply):
if not reply:
reply = []
for prop in self.volume[request.resource].metadata.values():
if prop.acl & ACL.READ and not (prop.acl & ACL.LOCAL) and \
not isinstance(prop, Aggregated):
reply.append(prop.name)
self._preget(request)
doc = self.volume[request.resource].get(request.guid)
enforce('deleted' not in doc['layer'], http.NotFound, 'Deleted')
return self._postget(request, doc, reply)
@route('GET', [None, None, None], mime_type='application/json')
def get_prop(self, request, response):
directory = self.volume[request.resource]
doc = directory.get(request.guid)
prop = directory.metadata[request.prop]
prop.assert_access(ACL.READ)
meta = doc.meta(prop.name)
if meta:
value = meta['value']
response.last_modified = meta['mtime']
else:
value = prop.default
value = _get_prop(doc, prop, value)
enforce(value is not File.AWAY, http.NotFound, 'No blob')
return value
@route('HEAD', [None, None, None])
def get_prop_meta(self, request, response):
return self.get_prop(request, response)
@route('POST', [None, None, None],
acl=ACL.AUTH, mime_type='application/json')
def insert_to_aggprop(self, request):
return self._aggpost(request, ACL.INSERT)
@route('PUT', [None, None, None, None],
acl=ACL.AUTH, mime_type='application/json')
def update_aggprop(self, request):
self._aggpost(request, ACL.REPLACE, request.key)
@route('DELETE', [None, None, None, None],
acl=ACL.AUTH, mime_type='application/json')
def remove_from_aggprop(self, request):
self._aggpost(request, ACL.REMOVE, request.key)
@route('PUT', [None, None], cmd='useradd',
arguments={'role': 0}, acl=ACL.AUTH | ACL.AUTHOR)
def useradd(self, request, user, role):
enforce(user, "Argument 'user' is not specified")
directory = self.volume[request.resource]
authors = directory.get(request.guid)['author']
self._useradd(authors, user, role)
directory.update(request.guid, {'author': authors})
@route('PUT', [None, None], cmd='userdel', acl=ACL.AUTH | ACL.AUTHOR)
def userdel(self, request, user):
enforce(user, "Argument 'user' is not specified")
enforce(user != request.principal, 'Cannot remove yourself')
directory = self.volume[request.resource]
authors = directory.get(request.guid)['author']
enforce(user in authors, 'No such user')
del authors[user]
directory.update(request.guid, {'author': authors})
@fallbackroute('GET', ['blobs'])
def blobs(self, request):
return blobs.get(request.guid)
def on_create(self, request, props):
ts = int(time.time())
props['ctime'] = ts
props['mtime'] = ts
if request.principal:
authors = props['author'] = {}
self._useradd(authors, request.principal, ACL.ORIGINAL)
def on_update(self, request, props):
props['mtime'] = int(time.time())
def on_aggprop_update(self, request, prop, value):
pass
def after_post(self, doc):
pass
@contextmanager
def _post(self, request, access):
content = request.content
enforce(isinstance(content, dict), http.BadRequest, 'Invalid value')
directory = self.volume[request.resource]
if access == ACL.CREATE:
doc = directory.resource_class(None, None)
if 'guid' in content:
# TODO Temporal security hole, see TODO
guid = content['guid']
enforce(not directory.exists(guid),
http.BadRequest, '%s already exists', guid)
enforce(_GUID_RE.match(guid) is not None,
http.BadRequest, 'Malformed %s GUID', guid)
else:
doc.props['guid'] = toolkit.uuid()
for name, prop in directory.metadata.items():
if name not in content and prop.default is not None:
doc.props[name] = prop.default
orig = None
this.resource = doc
else:
doc = directory.get(request.guid)
orig = directory.get(request.guid)
this.resource = orig
def teardown(new):
if orig is None:
return
for name, orig_value in orig.props.items():
if doc[name] == orig_value:
continue
prop = directory.metadata[name]
prop.teardown(doc[name] if new else orig_value)
try:
for name, value in content.items():
prop = directory.metadata[name]
prop.assert_access(access, orig[name] if orig else None)
try:
doc.props[name] = prop.typecast(value)
except Exception, error:
error = 'Value %r for %r property is invalid: %s' % \
(value, prop.name, error)
toolkit.exception(error)
raise http.BadRequest(error)
yield doc
except Exception:
teardown(True)
raise
else:
teardown(False)
def _preget(self, request):
reply = request.get('reply')
if not reply:
request['reply'] = ('guid',)
else:
directory = self.volume[request.resource]
for prop in reply:
directory.metadata[prop].assert_access(ACL.READ)
def _postget(self, request, doc, props):
result = {}
for name in props:
prop = doc.metadata[name]
value = _get_prop(doc, prop, doc.get(name))
if isinstance(value, File):
value = value.url
result[name] = value
return result
def _useradd(self, authors, user, role):
props = {}
users = self.volume['user']
if users.exists(user):
props['name'] = users.get(user)['name']
role |= ACL.INSYSTEM
else:
role &= ~ACL.INSYSTEM
props['role'] = role & (ACL.INSYSTEM | ACL.ORIGINAL)
if user in authors:
authors[user].update(props)
else:
if authors:
top = max(authors.values(), key=lambda x: x['order'])
props['order'] = top['order'] + 1
else:
props['order'] = 0
authors[user] = props
def _aggpost(self, request, acl, aggid=None):
doc = this.resource = self.volume[request.resource][request.guid]
prop = doc.metadata[request.prop]
enforce(isinstance(prop, Aggregated), http.BadRequest,
'Property is not aggregated')
prop.assert_access(acl)
if aggid and aggid in doc[request.prop]:
aggvalue = doc[request.prop][aggid]
self.on_aggprop_update(request, prop, aggvalue)
prop.subteardown(aggvalue['value'])
else:
enforce(acl != ACL.REMOVE, http.NotFound, 'No aggregated item')
self.on_aggprop_update(request, prop, None)
aggvalue = {}
if acl != ACL.REMOVE:
value = prop.subtypecast(
request.content_stream if request.content is None
else request.content)
if type(value) is tuple:
aggid_, value = value
enforce(not aggid or aggid == aggid_, http.BadRequest,
'Wrong aggregated id')
aggid = aggid_
elif not aggid:
aggid = toolkit.uuid()
aggvalue['value'] = value
if request.principal:
authors = aggvalue['author'] = {}
role = ACL.ORIGINAL if request.principal in doc['author'] else 0
self._useradd(authors, request.principal, role)
props = {request.prop: {aggid: aggvalue}}
self.on_update(request, props)
self.volume[request.resource].update(request.guid, props)
return aggid
def _get_prop(doc, prop, value):
value = prop.reprcast(value)
if prop.on_get is not None:
value = prop.on_get(doc, value)
return value
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