erebion/libervia-backend
Watch
1
0
Fork
You've already forked libervia-backend
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

plugin XEP-0084: "User Avatar" implementation:

Browse source 
rel 368
This commit is contained in:
Goffi 2022-06-29 11:59:07 +02:00
commit f6ccf044da
1 changed files with 268 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

268
sat/plugins/plugin_xep_0084.py Normal file
View file

@ -0,0 +1,268 @@
#!/usr/bin/env python3
# Libervia plugin for XEP-0084
# 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 <http://www.gnu.org/licenses/>.
from typing import Optional, Dict, Any
from pathlib import Path
from base64 import b64decode, b64encode
from twisted.internet import defer
from twisted.words.protocols.jabber.xmlstream import XMPPHandler
from twisted.words.protocols.jabber import jid, error
from twisted.words.xish import domish
from zope.interface import implementer
from wokkel import disco, iwokkel, pubsub
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.core import exceptions
log = getLogger(__name__)
IMPORT_NAME = "XEP-0084"
PLUGIN_INFO = {
C.PI_NAME: "User Avatar",
C.PI_IMPORT_NAME: IMPORT_NAME,
C.PI_TYPE: C.PLUG_TYPE_XEP,
C.PI_MODES: C.PLUG_MODE_BOTH,
C.PI_PROTOCOLS: ["XEP-0084"],
C.PI_DEPENDENCIES: ["IDENTITY", "XEP-0060", "XEP-0163"],
C.PI_MAIN: "XEP_0084",
C.PI_HANDLER: "yes",
C.PI_DESCRIPTION: _("""XEP-0084 (User Avatar) implementation"""),
}
NS_AVATAR = "urn:xmpp:avatar"
NS_AVATAR_METADATA = f"{NS_AVATAR}:metadata"
NS_AVATAR_DATA = f"{NS_AVATAR}:data"
class XEP_0084:
namespace_metadata = NS_AVATAR_METADATA
namespace_data = NS_AVATAR_DATA
def __init__(self, host):
log.info(_("XEP-0084 (User Avatar) plugin initialization"))
host.registerNamespace("avatar_metadata", NS_AVATAR_METADATA)
host.registerNamespace("avatar_data", NS_AVATAR_DATA)
self.host = host
self._p = host.plugins["XEP-0060"]
self._i = host.plugins['IDENTITY']
self._i.register(
IMPORT_NAME,
"avatar",
self.getAvatar,
self.setAvatar,
priority=2000
)
host.plugins["XEP-0163"].addPEPEvent(
None, NS_AVATAR_METADATA, self._onMetadataUpdate
)
def getHandler(self, client):
return XEP_0084_Handler()
def _onMetadataUpdate(self, itemsEvent, profile):
client = self.host.getClient(profile)
defer.ensureDeferred(self.onMetadataUpdate(client, itemsEvent))
async def onMetadataUpdate(
self,
client: SatXMPPEntity,
itemsEvent: pubsub.ItemsEvent
) -> None:
entity = client.jid.userhostJID()
avatar_metadata = await self.getAvatar(client, entity)
await self._i.update(client, IMPORT_NAME, "avatar", avatar_metadata, entity)
async def getAvatar(
self,
client: SatXMPPEntity,
entity_jid: jid.JID
) -> Optional[dict]:
"""Get avatar data
@param entity: entity to get avatar from
@return: avatar metadata, or None if no avatar has been found
"""
service = entity_jid.userhostJID()
# metadata
try:
items, __ = await self._p.getItems(
client,
service,
NS_AVATAR_METADATA,
max_items=1
)
except exceptions.NotFound:
return None
if not items:
return None
item_elt = items[0]
try:
metadata_elt = next(item_elt.elements(NS_AVATAR_METADATA, "metadata"))
except StopIteration:
log.warning(f"missing metadata element: {item_elt.toXml()}")
return None
for info_elt in metadata_elt.elements(NS_AVATAR_METADATA, "info"):
try:
metadata = {
"id": str(info_elt["id"]),
"size": int(info_elt["bytes"]),
"media_type": str(info_elt["type"])
}
avatar_id = metadata["id"]
if not avatar_id:
raise ValueError
except (KeyError, ValueError):
log.warning(f"invalid <info> element: {item_elt.toXml()}")
return None
# FIXME: to simplify, we only handle image/png for now
if metadata["media_type"] == "image/png":
break
else:
# mandatory image/png is missing, or avatar is disabled
# (https://xmpp.org/extensions/xep-0084.html#pub-disable)
return None
cache_data = self.host.common_cache.getMetadata(avatar_id)
if not cache_data:
try:
data_items, __ = await self._p.getItems(
client,
service,
NS_AVATAR_DATA,
item_ids=[avatar_id]
)
data_item_elt = data_items[0]
except (error.StanzaError, IndexError) as e:
log.warning(
f"Can't retrieve avatar of {service.full()} with ID {avatar_id!r}: "
f"{e}"
)
return None
try:
avatar_buf = b64decode(
str(next(data_item_elt.elements(NS_AVATAR_DATA, "data")))
)
except Exception as e:
log.warning(
f"invalid data element for {service.full()} with avatar ID "
f"{avatar_id!r}: {e}\n{data_item_elt.toXml()}"
)
return None
with self.host.common_cache.cacheData(
IMPORT_NAME,
avatar_id,
metadata["media_type"]
) as f:
f.write(avatar_buf)
cache_data = {
"path": Path(f.name),
"mime_type": metadata["media_type"]
}
return self._i.avatarBuildMetadata(
cache_data['path'], cache_data['mime_type'], avatar_id
)
def buildItemDataElt(self, avatar_data: Dict[str, Any]) -> domish.Element:
"""Generate the item for the data node
@param avatar_data: data as build by identity plugin (need to be filled with
"cache_uid" and "base64" keys)
"""
data_elt = domish.Element((NS_AVATAR_DATA, "data"))
data_elt.addContent(avatar_data["base64"])
return pubsub.Item(id=avatar_data["cache_uid"], payload=data_elt)
def buildItemMetadataElt(self, avatar_data: Dict[str, Any]) -> domish.Element:
"""Generate the item for the metadata node
@param avatar_data: data as build by identity plugin (need to be filled with
"cache_uid", "path", and "media_type" keys)
"""
metadata_elt = domish.Element((NS_AVATAR_METADATA, "metadata"))
info_elt = metadata_elt.addElement("info")
# FIXME: we only fill required elements for now (see
# https://xmpp.org/extensions/xep-0084.html#table-1)
info_elt["id"] = avatar_data["cache_uid"]
info_elt["type"] = avatar_data["media_type"]
info_elt["bytes"] = str(avatar_data["path"].stat().st_size)
return pubsub.Item(id=self._p.ID_SINGLETON, payload=metadata_elt)
async def setAvatar(
self,
client: SatXMPPEntity,
avatar_data: Dict[str, Any],
entity: jid.JID
) -> None:
"""Set avatar of the profile
@param avatar_data(dict): data of the image to use as avatar, as built by
IDENTITY plugin.
@param entity(jid.JID): entity whose avatar must be changed
"""
service = entity.userhostJID()
# Data
await self._p.createIfNewNode(
client,
service,
NS_AVATAR_DATA,
options={
self._p.OPT_ACCESS_MODEL: self._p.ACCESS_OPEN,
self._p.OPT_PERSIST_ITEMS: 1,
self._p.OPT_MAX_ITEMS: 1,
}
)
item_data_elt = self.buildItemDataElt(avatar_data)
await self._p.sendItems(client, service, NS_AVATAR_DATA, [item_data_elt])
# Metadata
await self._p.createIfNewNode(
client,
service,
NS_AVATAR_METADATA,
options={
self._p.OPT_ACCESS_MODEL: self._p.ACCESS_OPEN,
self._p.OPT_PERSIST_ITEMS: 1,
self._p.OPT_MAX_ITEMS: 1,
}
)
item_metadata_elt = self.buildItemMetadataElt(avatar_data)
await self._p.sendItems(client, service, NS_AVATAR_METADATA, [item_metadata_elt])
@implementer(iwokkel.IDisco)
class XEP_0084_Handler(XMPPHandler):
def getDiscoInfo(self, requestor, service, nodeIdentifier=""):
return [
disco.DiscoFeature(NS_AVATAR_METADATA),
disco.DiscoFeature(NS_AVATAR_DATA)
]
def getDiscoItems(self, requestor, service, nodeIdentifier=""):
return []