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# -*- coding: utf-8 -*-
# Copyright 2014 - 2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from twisted.internet import defer
from twisted.web.resource import Resource
from twisted.web.server import NOT_DONE_YET
from synapse.http.server import (
set_cors_headers,
wrap_json_request_handler,
)
from synapse.http.servlet import parse_integer, parse_string
from ._base import (
FileInfo, parse_media_id, respond_404, respond_with_file,
respond_with_responder,
)
logger = logging.getLogger(__name__)
class ThumbnailResource(Resource):
isLeaf = True
def __init__(self, hs, media_repo, media_storage):
Resource.__init__(self)
self.store = hs.get_datastore()
self.media_repo = media_repo
self.media_storage = media_storage
self.dynamic_thumbnails = hs.config.dynamic_thumbnails
self.server_name = hs.hostname
self.version_string = hs.version_string
self.clock = hs.get_clock()
def render_GET(self, request):
self._async_render_GET(request)
return NOT_DONE_YET
@wrap_json_request_handler
@defer.inlineCallbacks
def _async_render_GET(self, request):
set_cors_headers(request)
server_name, media_id, _ = parse_media_id(request)
width = parse_integer(request, "width")
height = parse_integer(request, "height")
method = parse_string(request, "method", "scale")
m_type = parse_string(request, "type", "image/png")
if server_name == self.server_name:
if self.dynamic_thumbnails:
yield self._select_or_generate_local_thumbnail(
request, media_id, width, height, method, m_type
)
else:
yield self._respond_local_thumbnail(
request, media_id, width, height, method, m_type
)
self.media_repo.mark_recently_accessed(None, media_id)
else:
if self.dynamic_thumbnails:
yield self._select_or_generate_remote_thumbnail(
request, server_name, media_id,
width, height, method, m_type
)
else:
yield self._respond_remote_thumbnail(
request, server_name, media_id,
width, height, method, m_type
)
self.media_repo.mark_recently_accessed(server_name, media_id)
@defer.inlineCallbacks
def _respond_local_thumbnail(self, request, media_id, width, height,
method, m_type):
media_info = yield self.store.get_local_media(media_id)
if not media_info:
respond_404(request)
return
if media_info["quarantined_by"]:
logger.info("Media is quarantined")
respond_404(request)
return
thumbnail_infos = yield self.store.get_local_media_thumbnails(media_id)
if thumbnail_infos:
thumbnail_info = self._select_thumbnail(
width, height, method, m_type, thumbnail_infos
)
file_info = FileInfo(
server_name=None, file_id=media_id,
url_cache=media_info["url_cache"],
thumbnail=True,
thumbnail_width=thumbnail_info["thumbnail_width"],
thumbnail_height=thumbnail_info["thumbnail_height"],
thumbnail_type=thumbnail_info["thumbnail_type"],
thumbnail_method=thumbnail_info["thumbnail_method"],
)
t_type = file_info.thumbnail_type
t_length = thumbnail_info["thumbnail_length"]
responder = yield self.media_storage.fetch_media(file_info)
yield respond_with_responder(request, responder, t_type, t_length)
else:
logger.info("Couldn't find any generated thumbnails")
respond_404(request)
@defer.inlineCallbacks
def _select_or_generate_local_thumbnail(self, request, media_id, desired_width,
desired_height, desired_method,
desired_type):
media_info = yield self.store.get_local_media(media_id)
if not media_info:
respond_404(request)
return
if media_info["quarantined_by"]:
logger.info("Media is quarantined")
respond_404(request)
return
thumbnail_infos = yield self.store.get_local_media_thumbnails(media_id)
for info in thumbnail_infos:
t_w = info["thumbnail_width"] == desired_width
t_h = info["thumbnail_height"] == desired_height
t_method = info["thumbnail_method"] == desired_method
t_type = info["thumbnail_type"] == desired_type
if t_w and t_h and t_method and t_type:
file_info = FileInfo(
server_name=None, file_id=media_id,
url_cache=media_info["url_cache"],
thumbnail=True,
thumbnail_width=info["thumbnail_width"],
thumbnail_height=info["thumbnail_height"],
thumbnail_type=info["thumbnail_type"],
thumbnail_method=info["thumbnail_method"],
)
t_type = file_info.thumbnail_type
t_length = info["thumbnail_length"]
responder = yield self.media_storage.fetch_media(file_info)
if responder:
yield respond_with_responder(request, responder, t_type, t_length)
return
logger.debug("We don't have a thumbnail of that size. Generating")
# Okay, so we generate one.
file_path = yield self.media_repo.generate_local_exact_thumbnail(
media_id, desired_width, desired_height, desired_method, desired_type,
url_cache=media_info["url_cache"],
)
if file_path:
yield respond_with_file(request, desired_type, file_path)
else:
logger.warn("Failed to generate thumbnail")
respond_404(request)
@defer.inlineCallbacks
def _select_or_generate_remote_thumbnail(self, request, server_name, media_id,
desired_width, desired_height,
desired_method, desired_type):
media_info = yield self.media_repo.get_remote_media_info(server_name, media_id)
thumbnail_infos = yield self.store.get_remote_media_thumbnails(
server_name, media_id,
)
file_id = media_info["filesystem_id"]
for info in thumbnail_infos:
t_w = info["thumbnail_width"] == desired_width
t_h = info["thumbnail_height"] == desired_height
t_method = info["thumbnail_method"] == desired_method
t_type = info["thumbnail_type"] == desired_type
if t_w and t_h and t_method and t_type:
file_info = FileInfo(
server_name=server_name, file_id=media_info["filesystem_id"],
thumbnail=True,
thumbnail_width=info["thumbnail_width"],
thumbnail_height=info["thumbnail_height"],
thumbnail_type=info["thumbnail_type"],
thumbnail_method=info["thumbnail_method"],
)
t_type = file_info.thumbnail_type
t_length = info["thumbnail_length"]
responder = yield self.media_storage.fetch_media(file_info)
if responder:
yield respond_with_responder(request, responder, t_type, t_length)
return
logger.debug("We don't have a thumbnail of that size. Generating")
# Okay, so we generate one.
file_path = yield self.media_repo.generate_remote_exact_thumbnail(
server_name, file_id, media_id, desired_width,
desired_height, desired_method, desired_type
)
if file_path:
yield respond_with_file(request, desired_type, file_path)
else:
logger.warn("Failed to generate thumbnail")
respond_404(request)
@defer.inlineCallbacks
def _respond_remote_thumbnail(self, request, server_name, media_id, width,
height, method, m_type):
# TODO: Don't download the whole remote file
# We should proxy the thumbnail from the remote server instead of
# downloading the remote file and generating our own thumbnails.
media_info = yield self.media_repo.get_remote_media_info(server_name, media_id)
thumbnail_infos = yield self.store.get_remote_media_thumbnails(
server_name, media_id,
)
if thumbnail_infos:
thumbnail_info = self._select_thumbnail(
width, height, method, m_type, thumbnail_infos
)
file_info = FileInfo(
server_name=server_name, file_id=media_info["filesystem_id"],
thumbnail=True,
thumbnail_width=thumbnail_info["thumbnail_width"],
thumbnail_height=thumbnail_info["thumbnail_height"],
thumbnail_type=thumbnail_info["thumbnail_type"],
thumbnail_method=thumbnail_info["thumbnail_method"],
)
t_type = file_info.thumbnail_type
t_length = thumbnail_info["thumbnail_length"]
responder = yield self.media_storage.fetch_media(file_info)
yield respond_with_responder(request, responder, t_type, t_length)
else:
logger.info("Failed to find any generated thumbnails")
respond_404(request)
def _select_thumbnail(self, desired_width, desired_height, desired_method,
desired_type, thumbnail_infos):
d_w = desired_width
d_h = desired_height
if desired_method.lower() == "crop":
info_list = []
info_list2 = []
for info in thumbnail_infos:
t_w = info["thumbnail_width"]
t_h = info["thumbnail_height"]
t_method = info["thumbnail_method"]
if t_method == "crop":
aspect_quality = abs(d_w * t_h - d_h * t_w)
min_quality = 0 if d_w <= t_w and d_h <= t_h else 1
size_quality = abs((d_w - t_w) * (d_h - t_h))
type_quality = desired_type != info["thumbnail_type"]
length_quality = info["thumbnail_length"]
if t_w >= d_w or t_h >= d_h:
info_list.append((
aspect_quality, min_quality, size_quality, type_quality,
length_quality, info
))
else:
info_list2.append((
aspect_quality, min_quality, size_quality, type_quality,
length_quality, info
))
if info_list:
return min(info_list)[-1]
else:
return min(info_list2)[-1]
else:
info_list = []
info_list2 = []
for info in thumbnail_infos:
t_w = info["thumbnail_width"]
t_h = info["thumbnail_height"]
t_method = info["thumbnail_method"]
size_quality = abs((d_w - t_w) * (d_h - t_h))
type_quality = desired_type != info["thumbnail_type"]
length_quality = info["thumbnail_length"]
if t_method == "scale" and (t_w >= d_w or t_h >= d_h):
info_list.append((
size_quality, type_quality, length_quality, info
))
elif t_method == "scale":
info_list2.append((
size_quality, type_quality, length_quality, info
))
if info_list:
return min(info_list)[-1]
else:
return min(info_list2)[-1]
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