196 lines
7.5 KiB
Python
196 lines
7.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from .base_resource import BaseMediaResource, parse_media_id
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from synapse.http.servlet import parse_string, parse_integer
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from synapse.http.server import request_handler
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from twisted.web.server import NOT_DONE_YET
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from twisted.internet import defer
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import logging
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logger = logging.getLogger(__name__)
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class ThumbnailResource(BaseMediaResource):
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isLeaf = True
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def render_GET(self, request):
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self._async_render_GET(request)
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return NOT_DONE_YET
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@request_handler
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@defer.inlineCallbacks
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def _async_render_GET(self, request):
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server_name, media_id, _ = parse_media_id(request)
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width = parse_integer(request, "width")
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height = parse_integer(request, "height")
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method = parse_string(request, "method", "scale")
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m_type = parse_string(request, "type", "image/png")
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if server_name == self.server_name:
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yield self._respond_local_thumbnail(
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request, media_id, width, height, method, m_type
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)
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else:
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yield self._respond_remote_thumbnail(
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request, server_name, media_id,
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width, height, method, m_type
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)
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@defer.inlineCallbacks
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def _respond_local_thumbnail(self, request, media_id, width, height,
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method, m_type):
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media_info = yield self.store.get_local_media(media_id)
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if not media_info:
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self._respond_404(request)
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return
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thumbnail_infos = yield self.store.get_local_media_thumbnails(media_id)
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if thumbnail_infos:
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thumbnail_info = self._select_thumbnail(
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width, height, method, m_type, thumbnail_infos
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)
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t_width = thumbnail_info["thumbnail_width"]
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t_height = thumbnail_info["thumbnail_height"]
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t_type = thumbnail_info["thumbnail_type"]
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t_method = thumbnail_info["thumbnail_method"]
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file_path = self.filepaths.local_media_thumbnail(
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media_id, t_width, t_height, t_type, t_method,
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)
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yield self._respond_with_file(request, t_type, file_path)
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else:
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yield self._respond_default_thumbnail(
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request, media_info, width, height, method, m_type,
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)
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@defer.inlineCallbacks
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def _respond_remote_thumbnail(self, request, server_name, media_id, width,
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height, method, m_type):
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# TODO: Don't download the whole remote file
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# We should proxy the thumbnail from the remote server instead.
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media_info = yield self._get_remote_media(server_name, media_id)
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thumbnail_infos = yield self.store.get_remote_media_thumbnails(
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server_name, media_id,
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)
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if thumbnail_infos:
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thumbnail_info = self._select_thumbnail(
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width, height, method, m_type, thumbnail_infos
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)
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t_width = thumbnail_info["thumbnail_width"]
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t_height = thumbnail_info["thumbnail_height"]
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t_type = thumbnail_info["thumbnail_type"]
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t_method = thumbnail_info["thumbnail_method"]
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file_id = thumbnail_info["filesystem_id"]
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t_length = thumbnail_info["thumbnail_length"]
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file_path = self.filepaths.remote_media_thumbnail(
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server_name, file_id, t_width, t_height, t_type, t_method,
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)
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yield self._respond_with_file(request, t_type, file_path, t_length)
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else:
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yield self._respond_default_thumbnail(
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request, media_info, width, height, method, m_type,
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)
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@defer.inlineCallbacks
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def _respond_default_thumbnail(self, request, media_info, width, height,
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method, m_type):
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media_type = media_info["media_type"]
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top_level_type = media_type.split("/")[0]
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sub_type = media_type.split("/")[-1].split(";")[0]
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thumbnail_infos = yield self.store.get_default_thumbnails(
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top_level_type, sub_type,
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)
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if not thumbnail_infos:
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thumbnail_infos = yield self.store.get_default_thumbnails(
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top_level_type, "_default",
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)
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if not thumbnail_infos:
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thumbnail_infos = yield self.store.get_default_thumbnails(
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"_default", "_default",
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)
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if not thumbnail_infos:
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self._respond_404(request)
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return
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thumbnail_info = self._select_thumbnail(
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width, height, "crop", m_type, thumbnail_infos
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)
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t_width = thumbnail_info["thumbnail_width"]
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t_height = thumbnail_info["thumbnail_height"]
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t_type = thumbnail_info["thumbnail_type"]
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t_method = thumbnail_info["thumbnail_method"]
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t_length = thumbnail_info["thumbnail_length"]
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file_path = self.filepaths.default_thumbnail(
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top_level_type, sub_type, t_width, t_height, t_type, t_method,
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)
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yield self.respond_with_file(request, t_type, file_path, t_length)
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def _select_thumbnail(self, desired_width, desired_height, desired_method,
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desired_type, thumbnail_infos):
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d_w = desired_width
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d_h = desired_height
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if desired_method.lower() == "crop":
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info_list = []
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for info in thumbnail_infos:
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t_w = info["thumbnail_width"]
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t_h = info["thumbnail_height"]
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t_method = info["thumbnail_method"]
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if t_method == "scale" or t_method == "crop":
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aspect_quality = abs(d_w * t_h - d_h * t_w)
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size_quality = abs((d_w - t_w) * (d_h - t_h))
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type_quality = desired_type != info["thumbnail_type"]
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length_quality = info["thumbnail_length"]
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info_list.append((
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aspect_quality, size_quality, type_quality,
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length_quality, info
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))
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if info_list:
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return min(info_list)[-1]
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else:
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info_list = []
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info_list2 = []
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for info in thumbnail_infos:
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t_w = info["thumbnail_width"]
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t_h = info["thumbnail_height"]
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t_method = info["thumbnail_method"]
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size_quality = abs((d_w - t_w) * (d_h - t_h))
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type_quality = desired_type != info["thumbnail_type"]
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length_quality = info["thumbnail_length"]
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if t_method == "scale" and (t_w >= d_w or t_h >= d_h):
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info_list.append((
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size_quality, type_quality, length_quality, info
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))
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elif t_method == "scale":
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info_list2.append((
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size_quality, type_quality, length_quality, info
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))
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if info_list:
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return min(info_list)[-1]
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else:
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return min(info_list2)[-1]
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