Mercurial > libervia-pubsub

annotate sat_pubsub/pubsub_admin.py @ 471:ed9e12701e0f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
backend: return empty roster when `NotAllowedError` is raised in `getOwnerRoster`: No error is logged either, this case can happen often is roster permission is not granted. fix 390
author Goffi <goffi@goffi.org>
date Thu, 21 Oct 2021 17:31:01 +0200
parents 412d26a9b2c2
children b544109ab4c4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
1 #!/usr/bin/env python3
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
2 #-*- coding: utf-8 -*-
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
3
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
4 # Copyright (c) 2019 Jérôme Poisson
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
5 #
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
6 # This program is free software: you can redistribute it and/or modify
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
7 # it under the terms of the GNU Affero General Public License as published by
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
8 # the Free Software Foundation, either version 3 of the License, or
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
9 # (at your option) any later version.
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
10 #
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
11 # This program is distributed in the hope that it will be useful,
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
14 # GNU Affero General Public License for more details.
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
15 #
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
16 # You should have received a copy of the GNU Affero General Public License
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
18
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
19 """
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
20 Pubsub Admin experimental protocol implementation
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
21
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
22 """
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
23
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
24 from zope.interface import implementer
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
25 from twisted.python import log
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
26 from twisted.internet import defer
391
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
27 from twisted.words.protocols.jabber import jid, error as jabber_error, xmlstream
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
28 from sat_pubsub import error
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
29 from wokkel.subprotocols import XMPPHandler
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
30 from wokkel import disco, iwokkel, pubsub
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
31
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
32 NS_PUBSUB_ADMIN = "https://salut-a-toi.org/spec/pubsub_admin:0"
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
33 ADMIN_REQUEST = '/iq[@type="set"]/admin[@xmlns="{}"]'.format(NS_PUBSUB_ADMIN)
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
34
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
35
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
36 @implementer(iwokkel.IDisco)
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
37 class PubsubAdminHandler(XMPPHandler):
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
38
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
39 def __init__(self, backend):
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
40 super(PubsubAdminHandler, self).__init__()
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
41 self.backend = backend
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
42
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
43 def connectionInitialized(self):
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
44 self.xmlstream.addObserver(ADMIN_REQUEST, self.onAdminRequest)
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
45
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
46 def sendError(self, iq_elt, condition='bad-request'):
391
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
47 stanza_error = jabber_error.StanzaError(condition)
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
48 iq_error = stanza_error.toResponse(iq_elt)
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
49 self.parent.xmlstream.send(iq_error)
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
50
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
51 @defer.inlineCallbacks
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
52 def onAdminRequest(self, iq_elt):
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
53 """Pubsub Admin request received"""
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
54 iq_elt.handled = True
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
55 try:
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
56 pep = bool(iq_elt.delegated)
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
57 except AttributeError:
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
58 pep = False
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
59
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
60 # is the sender really an admin?
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
61 admins = self.backend.config['admins_jids_list']
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
62 from_jid = jid.JID(iq_elt['from'])
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
63 if from_jid.userhostJID() not in admins:
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
64 log.msg("WARNING: admin request done by non admin entity {from_jid}"
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
65 .format(from_jid=from_jid.full()))
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
66 self.sendError(iq_elt, 'forbidden')
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
67 return
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
68
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
69 # alright, we can proceed
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
70 recipient = jid.JID(iq_elt['to'])
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
71 admin_elt = iq_elt.admin
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
72 try:
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
73 pubsub_elt = next(admin_elt.elements(pubsub.NS_PUBSUB, 'pubsub'))
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
74 publish_elt = next(pubsub_elt.elements(pubsub.NS_PUBSUB, 'publish'))
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
75 except StopIteration:
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
76 self.sendError(iq_elt)
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
77 return
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
78 try:
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
79 node = publish_elt['node']
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
80 except KeyError:
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
81 self.sendError(iq_elt)
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
82 return
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
83
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
84 # we prepare the result IQ request, we will fill it with item ids
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
85 iq_result_elt = xmlstream.toResponse(iq_elt, 'result')
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
86 result_admin_elt = iq_result_elt.addElement((NS_PUBSUB_ADMIN, 'admin'))
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
87 result_pubsub_elt = result_admin_elt.addElement((pubsub.NS_PUBSUB, 'pubsub'))
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
88 result_publish_elt = result_pubsub_elt.addElement('publish')
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
89 result_publish_elt['node'] = node
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
90
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
91 # now we can send the items
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
92 for item in publish_elt.elements(pubsub.NS_PUBSUB, 'item'):
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
93 try:
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
94 requestor = jid.JID(item.attributes.pop('publisher'))
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
95 except Exception as e:
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
96 log.msg("WARNING: invalid jid in publisher ({requestor}): {msg}"
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
97 .format(requestor=requestor, msg=e))
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
98 self.sendError(iq_elt)
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
99 return
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
100 except KeyError:
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
101 requestor = from_jid
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
102
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
103 # we don't use a DeferredList because we want to be sure that
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
104 # each request is done in order
391
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
105 try:
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
106 payload = yield self.backend.publish(
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
107 nodeIdentifier=node,
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
108 items=[item],
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
109 requestor=requestor,
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
110 pep=pep,
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
111 recipient=recipient)
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
112 except (error.Forbidden, error.ItemForbidden):
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
113 self.sendError(iq_elt, "forbidden")
391
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
114 return
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
115 except Exception as e:
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
116 self.sendError(iq_elt, "internal-server-error")
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
117 log.msg("INTERNAL ERROR: {msg}".format(msg=e))
391
1d2222a91e6b pubsub_admin: catch errors on publish, and send an iq error
Goffi <goffi@goffi.org>
parents: 382
diff changeset
118 return
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
119
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
120 result_item_elt = result_publish_elt.addElement('item')
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
121 # either the id was given and it is available in item
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
122 # either it's a new item, and we can retrieve it from return payload
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
123 try:
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
124 result_item_elt['id'] = item['id']
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
125 except KeyError:
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
126 result_item_elt = payload.publish.item['id']
382
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
127
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
128 self.xmlstream.send(iq_result_elt)
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
129
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
130 def getDiscoInfo(self, requestor, service, nodeIdentifier=''):
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
131 return [disco.DiscoFeature(NS_PUBSUB_ADMIN)]
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
132
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
133 def getDiscoItems(self, requestor, service, nodeIdentifier=''):
77b52dbda89a pubsub_admin: Pubsub Admin experimental protocol first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
134 return []