Mercurial > libervia-backend
view sat/plugins/plugin_xep_0231.py @ 3144:02325c3141dd
core (constants): parse `sat.conf` from `sat` module dir
author | Goffi <goffi@goffi.org> |
---|---|
date | Wed, 29 Jan 2020 19:05:41 +0100 |
parents | 559a625a236b |
children | 4230aaeab9a7 |
line wrap: on
line source
#!/usr/bin/env python3 # SAT plugin for Bit of Binary handling (XEP-0231) # Copyright (C) 2009-2020 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 log = getLogger(__name__) from sat.tools import xml_tools from wokkel import disco, iwokkel from zope.interface import implementer from twisted.python import failure from twisted.words.protocols.jabber import xmlstream from twisted.words.protocols.jabber import jid from twisted.words.protocols.jabber import error as jabber_error from twisted.internet import defer from functools import partial import base64 import time PLUGIN_INFO = { C.PI_NAME: "Bits of Binary", C.PI_IMPORT_NAME: "XEP-0231", C.PI_TYPE: "XEP", C.PI_MODES: C.PLUG_MODE_BOTH, C.PI_PROTOCOLS: ["XEP-0231"], C.PI_MAIN: "XEP_0231", C.PI_HANDLER: "yes", C.PI_DESCRIPTION: _( """Implementation of bits of binary (used for small images/files)""" ), } NS_BOB = "urn:xmpp:bob" IQ_BOB_REQUEST = C.IQ_GET + '/data[@xmlns="' + NS_BOB + '"]' class XEP_0231(object): def __init__(self, host): log.info(_("plugin Bits of Binary initialization")) self.host = host host.registerNamespace("bob", NS_BOB) host.trigger.add("xhtml_post_treat", self.XHTMLTrigger) host.bridge.addMethod( "bobGetFile", ".plugin", in_sign="sss", out_sign="s", method=self._getFile, async_=True, ) def dumpData(self, cache, data_elt, cid): """save file encoded in data_elt to cache @param cache(memory.cache.Cache): cache to use to store the data @param data_elt(domish.Element): <data> as in XEP-0231 @param cid(unicode): content-id @return(unicode): full path to dumped file """ # FIXME: is it needed to use a separate thread? # probably not with the little data expected with BoB try: max_age = int(data_elt["max-age"]) if max_age < 0: raise ValueError except (KeyError, ValueError): log.warning("invalid max-age found") max_age = None with cache.cacheData( PLUGIN_INFO[C.PI_IMPORT_NAME], cid, data_elt.getAttribute("type"), max_age ) as f: file_path = f.name f.write(base64.b64decode(str(data_elt))) return file_path def getHandler(self, client): return XEP_0231_handler(self) def _requestCb(self, iq_elt, cache, cid): for data_elt in iq_elt.elements(NS_BOB, "data"): if data_elt.getAttribute("cid") == cid: file_path = self.dumpData(cache, data_elt, cid) return file_path log.warning( "invalid data stanza received, requested cid was not found:\n{iq_elt}\nrequested cid: {cid}".format( iq_elt=iq_elt, cid=cid ) ) raise failure.Failure(exceptions.DataError("missing data")) def _requestEb(self, failure_): """Log the error and continue errback chain""" log.warning("Can't get requested data:\n{reason}".format(reason=failure_)) return failure_ def requestData(self, client, to_jid, cid, cache=None): """Request data if we don't have it in cache @param to_jid(jid.JID): jid to request the data to @param cid(unicode): content id @param cache(memory.cache.Cache, None): cache to use client.cache will be used if None @return D(unicode): path to file with data """ if cache is None: cache = client.cache iq_elt = client.IQ("get") iq_elt["to"] = to_jid.full() data_elt = iq_elt.addElement((NS_BOB, "data")) data_elt["cid"] = cid d = iq_elt.send() d.addCallback(self._requestCb, cache, cid) d.addErrback(self._requestEb) return d def _setImgEltSrc(self, path, img_elt): img_elt["src"] = "file://{}".format(path) def XHTMLTrigger(self, client, message_elt, body_elt, lang, treat_d): for img_elt in xml_tools.findAll(body_elt, C.NS_XHTML, "img"): source = img_elt.getAttribute("src", "") if source.startswith("cid:"): cid = source[4:] file_path = client.cache.getFilePath(cid) if file_path is not None: # image is in cache, we change the url img_elt["src"] = "file://{}".format(file_path) continue else: # image is not in cache, is it given locally? for data_elt in message_elt.elements(NS_BOB, "data"): if data_elt.getAttribute("cid") == cid: file_path = self.dumpData(client.cache, data_elt, cid) img_elt["src"] = "file://{}".format(file_path) break else: # cid not found locally, we need to request it # so we use the deferred d = self.requestData(client, jid.JID(message_elt["from"]), cid) d.addCallback(partial(self._setImgEltSrc, img_elt=img_elt)) treat_d.addCallback(lambda __: d) def onComponentRequest(self, iq_elt, client): """cache data is retrieve from common cache for components""" # FIXME: this is a security/privacy issue as no access check is done # but this is mitigated by the fact that the cid must be known. # An access check should be implemented though. iq_elt.handled = True data_elt = next(iq_elt.elements(NS_BOB, "data")) try: cid = data_elt["cid"] except KeyError: error_elt = jabber_error.StanzaError("not-acceptable").toResponse(iq_elt) client.send(error_elt) return metadata = self.host.common_cache.getMetadata(cid) if metadata is None: error_elt = jabber_error.StanzaError("item-not-found").toResponse(iq_elt) client.send(error_elt) return with open(metadata["path"]) as f: data = f.read() result_elt = xmlstream.toResponse(iq_elt, "result") data_elt = result_elt.addElement((NS_BOB, "data"), content=data.encode("base64")) data_elt["cid"] = cid data_elt["type"] = metadata["mime_type"] data_elt["max-age"] = str(int(max(0, metadata["eol"] - time.time()))) client.send(result_elt) def _getFile(self, peer_jid_s, cid, profile): peer_jid = jid.JID(peer_jid_s) assert cid client = self.host.getClient(profile) return self.getFile(client, peer_jid, cid) def getFile(self, client, peer_jid, cid, parent_elt=None): """Retrieve a file from it's content-id @param peer_jid(jid.JID): jid of the entity offering the data @param cid(unicode): content-id of file data @param parent_elt(domish.Element, None): if file is not in cache, data will be looked after in children of this elements. None to ignore @return D(unicode): path to cached data """ file_path = client.cache.getFilePath(cid) if file_path is not None: # file is in cache return defer.succeed(file_path) else: # file not in cache, is it given locally? if parent_elt is not None: for data_elt in parent_elt.elements(NS_BOB, "data"): if data_elt.getAttribute("cid") == cid: return defer.succeed(self.dumpData(client.cache, data_elt, cid)) # cid not found locally, we need to request it # so we use the deferred return self.requestData(client, peer_jid, cid) @implementer(iwokkel.IDisco) class XEP_0231_handler(xmlstream.XMPPHandler): def __init__(self, plugin_parent): self.plugin_parent = plugin_parent self.host = plugin_parent.host def connectionInitialized(self): if self.parent.is_component: self.xmlstream.addObserver( IQ_BOB_REQUEST, self.plugin_parent.onComponentRequest, client=self.parent ) def getDiscoInfo(self, requestor, target, nodeIdentifier=""): return [disco.DiscoFeature(NS_BOB)] def getDiscoItems(self, requestor, target, nodeIdentifier=""): return []