--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/plugins/plugin_exp_pubsub_hook.py	Wed Jul 05 15:05:47 2017 +0200
@@ -0,0 +1,249 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+
+# SAT plugin for Pubsub Hooks
+# Copyright (C) 2009-2017 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 <http://www.gnu.org/licenses/>.
+
+from sat.core.i18n import _
+from sat.core.constants import Const as C
+from sat.core import exceptions
+from sat.core.log import getLogger
+from sat.memory import persistent
+from twisted.words.protocols.jabber import jid
+from twisted.internet import defer
+log = getLogger(__name__)
+
+NS_PUBSUB_HOOK = 'PUBSUB_HOOK'
+
+PLUGIN_INFO = {
+    C.PI_NAME: "PubSub Hook",
+    C.PI_IMPORT_NAME: NS_PUBSUB_HOOK,
+    C.PI_TYPE: "EXP",
+    C.PI_PROTOCOLS: [],
+    C.PI_DEPENDENCIES: ["XEP-0060"],
+    C.PI_MAIN: "PubsubHook",
+    C.PI_HANDLER: "no",
+    C.PI_DESCRIPTION: _("""Experimental plugin to launch on action on Pubsub notifications""")
+}
+
+# python module
+HOOK_TYPE_PYTHON = u'python'
+# python file path
+HOOK_TYPE_PYTHON_FILE = u'python_file'
+# python code directly
+HOOK_TYPE_PYTHON_CODE = u'python_code'
+HOOK_TYPES = (HOOK_TYPE_PYTHON, HOOK_TYPE_PYTHON_FILE, HOOK_TYPE_PYTHON_CODE)
+
+
+class PubsubHook(object):
+
+    def __init__(self, host):
+        log.info(_(u"PubSub Hook initialization"))
+        self.host = host
+        self.node_hooks = {}  # keep track of the number of hooks per node (for all profiles)
+        host.bridge.addMethod("psHookAdd", ".plugin",
+                              in_sign='ssssbs', out_sign='',
+                              method=self._addHook
+                              )
+        host.bridge.addMethod("psHookRemove", ".plugin",
+                              in_sign='sssss', out_sign='i',
+                              method=self._removeHook
+                              )
+        host.bridge.addMethod("psHookList", ".plugin",
+                              in_sign='s', out_sign='aa{ss}',
+                              method=self._listHooks
+                              )
+
+    @defer.inlineCallbacks
+    def profileConnected(self, client):
+        hooks = client._hooks = persistent.PersistentBinaryDict(NS_PUBSUB_HOOK, client.profile)
+        client._hooks_temporary = {}
+        yield hooks.load()
+        for node in hooks:
+            self._installNodeManager(client, node)
+
+    def profileDisconnected(self, client):
+        for node in client._hooks:
+            self._removeNodeManager(client, node)
+
+    def _installNodeManager(self, client, node):
+        if node in self.node_hooks:
+            log.debug(_(u"node manager already set for {node}").format(node=node))
+            self.node_hooks[node] += 1
+        else:
+            # first hook on this node
+            self.host.plugins['XEP-0060'].addManagedNode(node, items_cb=self._itemsReceived)
+            self.node_hooks[node] = 0
+            log.info(_(u"node manager installed on {node}").format(
+                node = node))
+
+    def _removeNodeManager(self, client, node):
+        try:
+            self.node_hooks[node] -= 1
+        except KeyError:
+            log.error(_(u"trying to remove a {node} without hook").format(node=node))
+        else:
+            if self.node_hooks[node] == 0:
+                del self.node_hooks[node]
+                self.host.plugins['XEP-0060'].removeManagedNode(node, self._itemsReceived)
+                log.debug(_(u"hook removed"))
+            else:
+                log.debug(_(u"node still needed for an other hook"))
+
+    def installHook(self, client, service, node, hook_type, hook_arg, persistent):
+        if hook_type not in HOOK_TYPES:
+            raise exceptions.DataError(_(u'{hook_type} is not handled').format(hook_type=hook_type))
+        if hook_type != HOOK_TYPE_PYTHON_FILE:
+            raise NotImplementedError(_(u'{hook_type} hook type not implemented yet').format(hook_type=hook_type))
+        self._installNodeManager(client, node)
+        hook_data = {'service': service,
+                     'type': hook_type,
+                     'arg': hook_arg
+                    }
+
+        if persistent:
+            hooks_list = client._hooks.setdefault(node,[])
+            hooks_list.append(hook_data)
+            client._hooks.force(node)
+        else:
+            hooks_list = client._hooks_temporary.setdefault(node,[])
+            hooks_list.append(hook_data)
+
+        log.info(_(u"{persistent} hook installed on {node} for {profile}").format(
+            persistent = _(u'persistent') if persistent else _(u'temporary'),
+            node = node,
+            profile = client.profile))
+
+    def _itemsReceived(self, client, itemsEvent):
+        node = itemsEvent.nodeIdentifier
+        for hooks in (client._hooks, client._hooks_temporary):
+            if node not in hooks:
+                continue
+            hooks_list = hooks[node]
+            for hook_data in hooks_list[:]:
+                if hook_data['service'] != itemsEvent.sender.userhostJID():
+                    continue
+                try:
+                    callback = hook_data['callback']
+                except KeyError:
+                    # first time we get this hook, we create the callback
+                    hook_type = hook_data['type']
+                    try:
+                        if hook_type == HOOK_TYPE_PYTHON_FILE:
+                            hook_globals = {}
+                            execfile(hook_data['arg'], hook_globals)
+                            callback = hook_globals['hook']
+                        else:
+                            raise NotImplementedError(_(u'{hook_type} hook type not implemented yet').format(
+                                hook_type=hook_type))
+                    except Exception as e:
+                        log.warning(_(u"Can't load Pubsub hook at node {node}, it will be removed: {reason}").format(
+                            node=node, reason=e))
+                        hooks_list.remove(hook_data)
+                        continue
+
+                for item in itemsEvent.items:
+                    try:
+                        callback(self.host, client, item)
+                    except Exception as e:
+                        log.warning(_(u"Error while running Pubsub hook for node {node}: {msg}").format(
+                            node = node,
+                            msg = e))
+
+    def _addHook(self, service, node, hook_type, hook_arg, persistent, profile):
+        client = self.host.getClient(profile)
+        service = jid.JID(service) if service else client.jid.userhostJID()
+        return self.addHook(client, service, unicode(node), unicode(hook_type), unicode(hook_arg), persistent)
+
+    def addHook(self, client, service, node, hook_type, hook_arg, persistent):
+        r"""Add a hook which will be triggered on a pubsub notification
+
+        @param service(jid.JID): service of the node
+        @param node(unicode): Pubsub node
+        @param hook_type(unicode): type of the hook, one of:
+            - HOOK_TYPE_PYTHON: a python module (must be in path)
+                module must have a "hook" method which will be called
+            - HOOK_TYPE_PYTHON_FILE: a python file
+                file must have a "hook" method which will be called
+            - HOOK_TYPE_PYTHON_CODE: direct python code
+            /!\ Python hooks will be executed in SàT context,
+                with host, client and item as arguments, it means that:
+                    - they can do whatever they wants, so don't run untrusted hooks
+                    - they MUST NOT BLOCK, they are run in Twisted async environment and blocking would block whole SàT process
+                    - item are domish.Element
+        @param hook_arg(unicode): argument of the hook, depending on the hook_type
+            can be a module path, file path, python code
+        """
+        assert service is not None
+        return self.installHook(client, service, node, hook_type, hook_arg, persistent)
+
+    def _removeHook(self, service, node, hook_type, hook_arg, profile):
+        client = self.host.getClient(profile)
+        service = jid.JID(service) if service else client.jid.userhostJID()
+        return self.removeHook(client, service, node, hook_type or None, hook_arg or None)
+
+    def removeHook(self, client, service, node, hook_type=None, hook_arg=None):
+        """Remove a persistent or temporaty root
+
+        @param service(jid.JID): service of the node
+        @param node(unicode): Pubsub node
+        @param hook_type(unicode, None): same as for [addHook]
+            match all if None
+        @param hook_arg(unicode, None): same as for [addHook]
+            match all if None
+        @return(int): number of hooks removed
+        """
+        removed = 0
+        for hooks in (client._hooks, client._hooks_temporary):
+            if node in hooks:
+                for hook_data in hooks[node]:
+                    if (service != hook_data[u'service']
+                        or hook_type is not None and hook_type != hook_data[u'type']
+                        or hook_arg is not None and hook_arg != hook_data[u'arg']):
+                        continue
+                    hooks[node].remove(hook_data)
+                    removed += 1
+                    if not hooks[node]:
+                        # no more hooks, we can remove the node
+                        del hooks[node]
+                        self._removeNodeManager(client, node)
+                    else:
+                        if hooks == client._hooks:
+                            hooks.force(node)
+        return removed
+
+    def _listHooks(self, profile):
+        hooks_list = self.listHooks(self.host.getClient(profile))
+        for hook in hooks_list:
+            hook[u'service'] = hook[u'service'].full()
+            hook[u'persistent'] = C.boolConst(hook[u'persistent'])
+        return hooks_list
+
+    def listHooks(self, client):
+        """return list of registered hooks"""
+        hooks_list = []
+        for hooks in (client._hooks, client._hooks_temporary):
+            persistent = hooks is client._hooks
+            for node, hooks_data in hooks.iteritems():
+                for hook_data in hooks_data:
+                    hooks_list.append({u'service': hook_data[u'service'],
+                                       u'node': node,
+                                       u'type': hook_data[u'type'],
+                                       u'arg': hook_data[u'arg'],
+                                       u'persistent': persistent
+                                       })
+        return hooks_list
+