diff --git a/sat/plugins/plugin_xep_0191.py b/sat/plugins/plugin_xep_0191.py
new file mode 100644
index 00000000..8d7ae300
--- /dev/null
+++ b/sat/plugins/plugin_xep_0191.py
@@ -0,0 +1,210 @@
+#!/usr/bin/env python3
+
+# Libervia plugin for XEP-0191
+# Copyright (C) 2009-2022 Jérôme Poisson (goffi@goffi.org)
+
+# 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 .
+
+from typing import List, Set
+
+from twisted.words.protocols.jabber import xmlstream, jid
+from twisted.words.xish import domish
+from twisted.internet import defer
+from zope.interface import implementer
+from wokkel import disco, iwokkel
+
+from sat.core.constants import Const as C
+from sat.core.i18n import _
+from sat.core.log import getLogger
+from sat.core.core_types import SatXMPPEntity
+from sat.tools.utils import ensure_deferred
+
+log = getLogger(__name__)
+
+PLUGIN_INFO = {
+ C.PI_NAME: "Pubsub Public Subscriptions",
+ C.PI_IMPORT_NAME: "XEP-0191",
+ C.PI_TYPE: C.PLUG_TYPE_XEP,
+ C.PI_MODES: C.PLUG_MODE_BOTH,
+ C.PI_PROTOCOLS: ["XEP-0191"],
+ C.PI_DEPENDENCIES: ["XEP-0060", "XEP-0376"],
+ C.PI_MAIN: "XEP_0191",
+ C.PI_HANDLER: "yes",
+ C.PI_DESCRIPTION: _("""Pubsub Public Subscriptions implementation"""),
+}
+
+NS_BLOCKING = "urn:xmpp:blocking"
+IQ_BLOCK_PUSH = f'{C.IQ_SET}/block[@xmlns="{NS_BLOCKING}"]'
+IQ_UNBLOCK_PUSH = f'{C.IQ_SET}/unblock[@xmlns="{NS_BLOCKING}"]'
+
+
+class XEP_0191:
+
+ def __init__(self, host):
+ log.info(_("Blocking Command initialization"))
+ host.registerNamespace("blocking", NS_BLOCKING)
+ self.host = host
+ host.bridge.addMethod(
+ "blockingList",
+ ".plugin",
+ in_sign="s",
+ out_sign="as",
+ method=self._blockList,
+ async_=True,
+ )
+ host.bridge.addMethod(
+ "blockingBlock",
+ ".plugin",
+ in_sign="ass",
+ out_sign="",
+ method=self._block,
+ async_=True,
+ )
+ host.bridge.addMethod(
+ "blockingUnblock",
+ ".plugin",
+ in_sign="ass",
+ out_sign="",
+ method=self._unblock,
+ async_=True,
+ )
+
+ def getHandler(self, client):
+ return XEP_0191_Handler(self)
+
+ @ensure_deferred
+ async def _blockList(
+ self,
+ profile_key=C.PROF_KEY_NONE
+ ) -> List[str]:
+ client = self.host.getClient(profile_key)
+ blocked_jids = await self.blockList(client)
+ return [j.full() for j in blocked_jids]
+
+ async def blockList(self, client: SatXMPPEntity) -> Set[jid.JID]:
+ await self.host.checkFeature(client, NS_BLOCKING)
+ iq_elt = client.IQ("get")
+ iq_elt.addElement((NS_BLOCKING, "blocklist"))
+ iq_result_elt = await iq_elt.send()
+ try:
+ blocklist_elt = next(iq_result_elt.elements(NS_BLOCKING, "blocklist"))
+ except StopIteration:
+ log.warning(f"missing element: {iq_result_elt.toXml()}")
+ return []
+ blocked_jids = set()
+ for item_elt in blocklist_elt.elements(NS_BLOCKING, "item"):
+ try:
+ blocked_jid = jid.JID(item_elt["jid"])
+ except (RuntimeError, AttributeError):
+ log.warning(f"Invalid - element in block list: {item_elt.toXml()}")
+ else:
+ blocked_jids.add(blocked_jid)
+
+ return blocked_jids
+
+ def _block(
+ self,
+ entities: List[str],
+ profile_key: str = C.PROF_KEY_NONE
+ ) -> str:
+ client = self.host.getClient(profile_key)
+ return defer.ensureDeferred(
+ self.block(client, [jid.JID(entity) for entity in entities])
+ )
+
+ async def block(self, client: SatXMPPEntity, entities: List[jid.JID]) -> None:
+ await self.host.checkFeature(client, NS_BLOCKING)
+ iq_elt = client.IQ("set")
+ block_elt = iq_elt.addElement((NS_BLOCKING, "block"))
+ for entity in entities:
+ item_elt = block_elt.addElement("item")
+ item_elt["jid"] = entity.full()
+ await iq_elt.send()
+
+ def _unblock(
+ self,
+ entities: List[str],
+ profile_key: str = C.PROF_KEY_NONE
+ ) -> None:
+ client = self.host.getClient(profile_key)
+ return defer.ensureDeferred(
+ self.unblock(client, [jid.JID(e) for e in entities])
+ )
+
+ async def unblock(self, client: SatXMPPEntity, entities: List[jid.JID]) -> None:
+ await self.host.checkFeature(client, NS_BLOCKING)
+ iq_elt = client.IQ("set")
+ unblock_elt = iq_elt.addElement((NS_BLOCKING, "unblock"))
+ for entity in entities:
+ item_elt = unblock_elt.addElement("item")
+ item_elt["jid"] = entity.full()
+ await iq_elt.send()
+
+ def onBlockPush(self, iq_elt: domish.Element, client: SatXMPPEntity) -> None:
+ # TODO: send notification to user
+ iq_elt.handled = True
+ for item_elt in iq_elt.block.elements(NS_BLOCKING, "item"):
+ try:
+ entity = jid.JID(item_elt["jid"])
+ except (KeyError, RuntimeError):
+ log.warning(f"invalid item received in block push: {item_elt.toXml()}")
+ else:
+ log.info(f"{entity.full()} has been blocked for {client.profile}")
+ iq_result_elt = xmlstream.toResponse(iq_elt, "result")
+ client.send(iq_result_elt)
+
+ def onUnblockPush(self, iq_elt: domish.Element, client: SatXMPPEntity) -> None:
+ # TODO: send notification to user
+ iq_elt.handled = True
+ items = list(iq_elt.unblock.elements(NS_BLOCKING, "item"))
+ if not items:
+ log.info(f"All entities have been unblocked for {client.profile}")
+ else:
+ for item_elt in items:
+ try:
+ entity = jid.JID(item_elt["jid"])
+ except (KeyError, RuntimeError):
+ log.warning(
+ f"invalid item received in unblock push: {item_elt.toXml()}"
+ )
+ else:
+ log.info(f"{entity.full()} has been unblocked for {client.profile}")
+ iq_result_elt = xmlstream.toResponse(iq_elt, "result")
+ client.send(iq_result_elt)
+
+
+@implementer(iwokkel.IDisco)
+class XEP_0191_Handler(xmlstream.XMPPHandler):
+
+ def __init__(self, plugin_parent: XEP_0191):
+ self.plugin_parent = plugin_parent
+
+ def connectionInitialized(self):
+ self.xmlstream.addObserver(
+ IQ_BLOCK_PUSH,
+ self.plugin_parent.onBlockPush,
+ client=self.parent
+
+ )
+ self.xmlstream.addObserver(
+ IQ_UNBLOCK_PUSH,
+ self.plugin_parent.onUnblockPush,
+ client=self.parent
+ )
+
+ def getDiscoInfo(self, requestor, service, nodeIdentifier=""):
+ return [disco.DiscoFeature(NS_BLOCKING)]
+
+ def getDiscoItems(self, requestor, service, nodeIdentifier=""):
+ return []