207 lines
7.1 KiB
Python
207 lines
7.1 KiB
Python
#!/usr/bin/env python3
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# SàT plugin for managing xep-0264
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# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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# Copyright (C) 2014 Emmanuel Gil Peyrot (linkmauve@linkmauve.fr)
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from libervia.backend.core.i18n import _
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from libervia.backend.core.constants import Const as C
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from libervia.backend.core.log import getLogger
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log = getLogger(__name__)
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from twisted.internet import threads
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from twisted.python.failure import Failure
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from zope.interface import implementer
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from wokkel import disco, iwokkel
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from libervia.backend.core import exceptions
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import hashlib
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try:
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from PIL import Image, ImageOps
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except:
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raise exceptions.MissingModule(
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"Missing module pillow, please download/install it from https://python-pillow.github.io"
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)
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# cf. https://stackoverflow.com/a/23575424
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from PIL import ImageFile
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ImageFile.LOAD_TRUNCATED_IMAGES = True
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try:
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from twisted.words.protocols.xmlstream import XMPPHandler
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except ImportError:
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from wokkel.subprotocols import XMPPHandler
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MIME_TYPE = "image/jpeg"
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SAVE_FORMAT = "JPEG" # (cf. Pillow documentation)
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NS_THUMBS = "urn:xmpp:thumbs:1"
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PLUGIN_INFO = {
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C.PI_NAME: "XEP-0264",
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C.PI_IMPORT_NAME: "XEP-0264",
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C.PI_TYPE: "XEP",
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C.PI_MODES: C.PLUG_MODE_BOTH,
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C.PI_PROTOCOLS: ["XEP-0264"],
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C.PI_DEPENDENCIES: ["XEP-0234"],
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C.PI_MAIN: "XEP_0264",
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C.PI_HANDLER: "yes",
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C.PI_DESCRIPTION: _("""Thumbnails handling"""),
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}
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class XEP_0264(object):
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SIZE_SMALL = (320, 320)
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SIZE_MEDIUM = (640, 640)
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SIZE_BIG = (1280, 1280)
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SIZE_FULL_SCREEN = (2560, 2560)
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# FIXME: SIZE_FULL_SCREEN is currently discarded as the resulting files are too big
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# for BoB
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# TODO: use an other mechanism than BoB for bigger files
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SIZES = (SIZE_SMALL, SIZE_MEDIUM, SIZE_BIG)
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def __init__(self, host):
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log.info(_("Plugin XEP_0264 initialization"))
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self.host = host
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host.trigger.add("XEP-0234_buildFileElement", self._add_file_thumbnails)
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host.trigger.add("XEP-0234_parseFileElement", self._get_file_thumbnails)
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def get_handler(self, client):
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return XEP_0264_handler()
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## triggers ##
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def _add_file_thumbnails(self, client, file_elt, extra_args):
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try:
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thumbnails = extra_args["extra"][C.KEY_THUMBNAILS]
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except KeyError:
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return
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for thumbnail in thumbnails:
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thumbnail_elt = file_elt.addElement((NS_THUMBS, "thumbnail"))
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thumbnail_elt["uri"] = "cid:" + thumbnail["id"]
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thumbnail_elt["media-type"] = MIME_TYPE
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width, height = thumbnail["size"]
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thumbnail_elt["width"] = str(width)
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thumbnail_elt["height"] = str(height)
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return True
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def _get_file_thumbnails(self, client, file_elt, file_data):
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thumbnails = []
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for thumbnail_elt in file_elt.elements(NS_THUMBS, "thumbnail"):
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uri = thumbnail_elt["uri"]
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if uri.startswith("cid:"):
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thumbnail = {"id": uri[4:]}
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width = thumbnail_elt.getAttribute("width")
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height = thumbnail_elt.getAttribute("height")
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if width and height:
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try:
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thumbnail["size"] = (int(width), int(height))
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except ValueError:
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pass
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try:
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thumbnail["mime_type"] = thumbnail_elt["media-type"]
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except KeyError:
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pass
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thumbnails.append(thumbnail)
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if thumbnails:
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# we want thumbnails ordered from smallest to biggest
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thumbnails.sort(key=lambda t: t.get('size', (0, 0)))
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file_data.setdefault("extra", {})[C.KEY_THUMBNAILS] = thumbnails
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return True
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## thumbnails generation ##
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def get_thumb_id(self, image_uid, size):
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"""return an ID unique for image/size combination
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@param image_uid(unicode): unique id of the image
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can be a hash
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@param size(tuple(int)): requested size of thumbnail
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@return (unicode): unique id for this image/size
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"""
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return hashlib.sha256(repr((image_uid, size)).encode()).hexdigest()
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def _blocking_gen_thumb(
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self, source_path, size=None, max_age=None, image_uid=None,
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fix_orientation=True):
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"""Generate a thumbnail for image
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This is a blocking method and must be executed in a thread
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params are the same as for [generate_thumbnail]
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"""
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if size is None:
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size = self.SIZE_SMALL
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try:
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img = Image.open(source_path)
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except IOError:
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return Failure(exceptions.DataError("Can't open image"))
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img.thumbnail(size)
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if fix_orientation:
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img = ImageOps.exif_transpose(img)
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uid = self.get_thumb_id(image_uid or source_path, size)
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with self.host.common_cache.cache_data(
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PLUGIN_INFO[C.PI_IMPORT_NAME], uid, MIME_TYPE, max_age
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) as f:
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img.save(f, SAVE_FORMAT)
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if fix_orientation:
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log.debug(f"fixed orientation for {f.name}")
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return img.size, uid
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def generate_thumbnail(
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self, source_path, size=None, max_age=None, image_uid=None, fix_orientation=True):
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"""Generate a thumbnail of image
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@param source_path(unicode): absolute path to source image
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@param size(int, None): max size of the thumbnail
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can be one of self.SIZE_*
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None to use default value (i.e. self.SIZE_SMALL)
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@param max_age(int, None): same as for [memory.cache.Cache.cache_data])
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@param image_uid(unicode, None): unique ID to identify the image
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use hash whenever possible
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if None, source_path will be used
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@param fix_orientation(bool): if True, fix orientation using EXIF data
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@return D(tuple[tuple[int,int], unicode]): tuple with:
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- size of the thumbnail
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- unique Id of the thumbnail
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"""
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d = threads.deferToThread(
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self._blocking_gen_thumb, source_path, size, max_age, image_uid=image_uid,
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fix_orientation=fix_orientation
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)
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d.addErrback(
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lambda failure_: log.error("thumbnail generation error: {}".format(failure_))
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)
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return d
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@implementer(iwokkel.IDisco)
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class XEP_0264_handler(XMPPHandler):
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def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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return [disco.DiscoFeature(NS_THUMBS)]
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def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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return []
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