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# -*- coding: utf-8 -*-
# Copyright 2014 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.
from .base_resource import BaseMediaResource
from twisted.web.server import NOT_DONE_YET
from twisted.internet import defer
import logging
logger = logging.getLogger(__name__)
class ThumbnailResource(BaseMediaResource):
isLeaf = True
def render_GET(self, request):
self._async_render_GET(request)
return NOT_DONE_YET
@BaseMediaResource.catch_errors
@defer.inlineCallbacks
def _async_render_GET(self, request):
server_name, media_id = self._parse_media_id(request)
width = self._parse_integer(request, "width")
height = self._parse_integer(request, "height")
method = self._parse_string(request, "method", "scale")
m_type = self._parse_string(request, "type", "image/png")
if server_name == self.server_name:
yield self._respond_local_thumbnail(
request, media_id, width, height, method, m_type
)
else:
yield self._respond_remote_thumbnail(
request, server_name, media_id,
width, height, method, m_type
)
@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:
self._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
)
t_width = thumbnail_info["thumbnail_width"]
t_height = thumbnail_info["thumbnail_height"]
t_type = thumbnail_info["thumbnail_type"]
t_method = thumbnail_info["thumbnail_method"]
file_path = self.filepaths.local_media_thumbnail(
media_id, t_width, t_height, t_type, t_method,
)
yield self._respond_with_file(request, t_type, file_path)
else:
yield self._respond_default_thumbnail(
request, media_info, width, height, method, m_type,
)
@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.
media_info = yield self._get_remote_media(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
)
t_width = thumbnail_info["thumbnail_width"]
t_height = thumbnail_info["thumbnail_height"]
t_type = thumbnail_info["thumbnail_type"]
t_method = thumbnail_info["thumbnail_method"]
file_id = thumbnail_info["filesystem_id"]
t_length = thumbnail_info["thumbnail_length"]
file_path = self.filepaths.remote_media_thumbnail(
server_name, file_id, t_width, t_height, t_type, t_method,
)
yield self._respond_with_file(request, t_type, file_path, t_length)
else:
yield self._respond_default_thumbnail(
request, media_info, width, height, method, m_type,
)
@defer.inlineCallbacks
def _respond_default_thumbnail(self, request, media_info, width, height,
method, m_type):
media_type = media_info["media_type"]
top_level_type = media_type.split("/")[0]
sub_type = media_type.split("/")[-1].split(";")[0]
thumbnail_infos = yield self.store.get_default_thumbnails(
top_level_type, sub_type,
)
if not thumbnail_infos:
thumbnail_infos = yield self.store.get_default_thumbnails(
top_level_type, "_default",
)
if not thumbnail_infos:
thumbnail_infos = yield self.store.get_default_thumbnails(
"_default", "_default",
)
if not thumbnail_infos:
self._respond_404(request)
return
thumbnail_info = self._select_thumbnail(
width, height, "crop", m_type, thumbnail_infos
)
t_width = thumbnail_info["thumbnail_width"]
t_height = thumbnail_info["thumbnail_height"]
t_type = thumbnail_info["thumbnail_type"]
t_method = thumbnail_info["thumbnail_method"]
t_length = thumbnail_info["thumbnail_length"]
file_path = self.filepaths.default_thumbnail(
top_level_type, sub_type, t_width, t_height, t_type, t_method,
)
yield self.respond_with_file(request, t_type, file_path, t_length)
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 = []
for info in thumbnail_infos:
t_w = info["thumbnail_width"]
t_h = info["thumbnail_height"]
t_method = info["thumbnail_method"]
if t_method == "scale" or t_method == "crop":
aspect_quality = abs(d_w * t_h - d_h * t_w)
size_quality = abs((d_w - t_w) * (d_h - t_h))
type_quality = desired_type != info["thumbnail_type"]
length_quality = info["thumbnail_length"]
info_list.append((
aspect_quality, size_quality, type_quality,
length_quality, info
))
if info_list:
return min(info_list)[-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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