123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182 |
- # -*- 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"]
- 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)
- 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"]
- 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)
- 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
- ))
- return min(info_list)[-1]
- else:
- 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" and (t_w >= d_w or t_h >= d_h):
- 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((
- size_quality, type_quality, length_quality, info
- ))
- return min(info_list)[-1]
|