Mercurial > libervia-backend
view sat/plugins/plugin_xep_0231.py @ 3801:6952a002abc7
plugin XEP-424: Message Retractation implementation:
rel 367
author | Goffi <goffi@goffi.org> |
---|---|
date | Fri, 17 Jun 2022 14:15:23 +0200 |
parents | be6d91572633 |
children | 524856bd7b19 |
line wrap: on
line source
#!/usr/bin/env python3 # SAT plugin for Bit of Binary handling (XEP-0231) # Copyright (C) 2009-2021 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/>. import base64 import time from pathlib import Path from functools import partial 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 wokkel import disco, iwokkel from sat.tools import xml_tools 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__) 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 = 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"], 'rb') as f: data = f.read() result_elt = xmlstream.toResponse(iq_elt, "result") data_elt = result_elt.addElement( (NS_BOB, "data"), content=base64.b64encode(data).decode()) 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) d = self.getFile(client, peer_jid, cid) d.addCallback(lambda path: str(path)) return d 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(Path): 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 []