mirror of
https://github.com/minetest/contentdb.git
synced 2024-12-23 14:32:25 +01:00
109 lines
3.2 KiB
Python
109 lines
3.2 KiB
Python
# ContentDB
|
|
# Copyright (C) 2018-21 rubenwardy
|
|
#
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU Affero General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU Affero General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Affero General Public License
|
|
# along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
from flask import abort, send_file, Blueprint, current_app
|
|
import os
|
|
from PIL import Image
|
|
|
|
|
|
bp = Blueprint("thumbnails", __name__)
|
|
|
|
|
|
ALLOWED_RESOLUTIONS = [(100, 67), (270, 180), (350, 233), (1100, 520)]
|
|
ALLOWED_EXTENSIONS = {"png", "webp", "jpg"}
|
|
|
|
|
|
def mkdir(path):
|
|
assert path != "" and path is not None
|
|
try:
|
|
if not os.path.isdir(path):
|
|
os.mkdir(path)
|
|
except FileExistsError:
|
|
pass
|
|
|
|
|
|
def resize_and_crop(img_path, modified_path, size):
|
|
with Image.open(img_path) as img:
|
|
# Get current and desired ratio for the images
|
|
img_ratio = img.size[0] / float(img.size[1])
|
|
desired_ratio = size[0] / float(size[1])
|
|
|
|
# Is more portrait than target, scale and crop
|
|
if desired_ratio > img_ratio:
|
|
img = img.resize((int(size[0]), int(size[0] * img.size[1] / img.size[0])),
|
|
Image.BICUBIC)
|
|
box = (0, (img.size[1] - size[1]) / 2, img.size[0], (img.size[1] + size[1]) / 2)
|
|
img = img.crop(box)
|
|
|
|
# Is more landscape than target, scale and crop
|
|
elif desired_ratio < img_ratio:
|
|
img = img.resize((int(size[1] * img.size[0] / img.size[1]), int(size[1])),
|
|
Image.BICUBIC)
|
|
box = ((img.size[0] - size[0]) / 2, 0, (img.size[0] + size[0]) / 2, img.size[1])
|
|
img = img.crop(box)
|
|
|
|
# Is exactly the same ratio as target
|
|
else:
|
|
img = img.resize(size, Image.BICUBIC)
|
|
|
|
if modified_path.endswith(".jpg") and img.mode != "RGB":
|
|
img = img.convert("RGB")
|
|
|
|
img.save(modified_path, lossless=True)
|
|
|
|
|
|
def find_source_file(img):
|
|
upload_dir = current_app.config["UPLOAD_DIR"]
|
|
source_filepath = os.path.join(upload_dir, img)
|
|
if os.path.isfile(source_filepath):
|
|
return source_filepath
|
|
|
|
period = source_filepath.rfind(".")
|
|
start = source_filepath[:period]
|
|
ext = source_filepath[period + 1:]
|
|
if ext not in ALLOWED_EXTENSIONS:
|
|
abort(404)
|
|
|
|
for other_ext in ALLOWED_EXTENSIONS:
|
|
other_path = f"{start}.{other_ext}"
|
|
if ext != other_ext and os.path.isfile(other_path):
|
|
return other_path
|
|
|
|
abort(404)
|
|
|
|
|
|
@bp.route("/thumbnails/<int:level>/<img>")
|
|
def make_thumbnail(img, level):
|
|
if level > len(ALLOWED_RESOLUTIONS) or level <= 0:
|
|
abort(403)
|
|
w, h = ALLOWED_RESOLUTIONS[level - 1]
|
|
|
|
thumbnail_dir = current_app.config["THUMBNAIL_DIR"]
|
|
mkdir(thumbnail_dir)
|
|
|
|
output_dir = os.path.join(thumbnail_dir, str(level))
|
|
mkdir(output_dir)
|
|
|
|
cache_filepath = os.path.join(output_dir, img)
|
|
source_filepath = find_source_file(img)
|
|
|
|
if not os.path.isfile(cache_filepath):
|
|
resize_and_crop(source_filepath, cache_filepath, (w, h))
|
|
|
|
res = send_file(cache_filepath)
|
|
res.cache_control.max_age = 7*24*60*60
|
|
return res
|