Refactor endpoints to use blueprints instead

app/blueprints/thumbnails/__init__.py

@@ -0,0 +1,74 @@
+# Content DB
+# Copyright (C) 2018  rubenwardy
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+
+from flask import *
+
+bp = Blueprint("thumbnails", __name__)
+
+import os
+from PIL import Image
+
+ALLOWED_RESOLUTIONS=[(100,67), (270,180), (350,233)]
+
+def mkdir(path):
+	if not os.path.isdir(path):
+		os.mkdir(path)
+
+mkdir("app/public/thumbnails/")
+
+def resize_and_crop(img_path, modified_path, size):
+	img = Image.open(img_path)
+
+	# Get current and desired ratio for the images
+	img_ratio = img.size[0] / float(img.size[1])
+	ratio = size[0] / float(size[1])
+
+	# Is more portrait than target, scale and crop
+	if 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 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)
+
+	img.save(modified_path)
+
+
+@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]
+
+	mkdir("app/public/thumbnails/{:d}/".format(level))
+
+	cache_filepath  = "public/thumbnails/{:d}/{}".format(level, img)
+	source_filepath = "public/uploads/" + img
+
+	resize_and_crop("app/" + source_filepath, "app/" + cache_filepath, (w, h))
+	return send_file(cache_filepath)