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ScoDoc/app/scodoc/sco_logos.py

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# -*- mode: python -*-
# -*- coding: utf-8 -*-
##############################################################################
#
# Gestion scolarite IUT
#
# Copyright (c) 1999 - 2021 Emmanuel Viennet. All rights reserved.
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Emmanuel Viennet emmanuel.viennet@viennet.net
#
##############################################################################
"""Gestion des images logos (nouveau ScoDoc 9)
Les logos sont `logo_header.<ext>` et `logo_footer.<ext>`
avec `ext` membre de LOGOS_IMAGES_ALLOWED_TYPES (= jpg, png)
SCODOC_LOGOS_DIR /opt/scodoc-data/config/logos
"""
import imghdr
import os
from flask import abort, current_app
from app.scodoc import sco_utils as scu
def get_logo_filename(logo_type: str, scodoc_dept: str) -> str:
"""return full filename for this logo, or "" if not found
an existing file with extension.
logo_type: "header" or "footer"
scodoc-dept: acronym
"""
# Search logos in dept specific dir (/opt/scodoc-data/config/logos/logos_<dept>),
# then in config dir /opt/scodoc-data/config/logos/
for image_dir in (
scu.SCODOC_LOGOS_DIR + "/logos_" + scodoc_dept,
scu.SCODOC_LOGOS_DIR, # global logos
):
for suffix in scu.LOGOS_IMAGES_ALLOWED_TYPES:
filename = os.path.join(image_dir, f"logo_{logo_type}.{suffix}")
if os.path.isfile(filename) and os.access(filename, os.R_OK):
return filename
return ""
def guess_image_type(stream) -> str:
"guess image type from header in stream"
header = stream.read(512)
stream.seek(0)
fmt = imghdr.what(None, header)
if not fmt:
return None
return fmt if fmt != "jpeg" else "jpg"
def _ensure_directory_exists(filename):
"create enclosing directory if necessary"
directory = os.path.split(filename)[0]
if not os.path.exists(directory):
current_app.logger.info(f"sco_logos creating directory %s", directory)
os.mkdir(directory)
def store_image(stream, basename):
img_type = guess_image_type(stream)
if img_type not in scu.LOGOS_IMAGES_ALLOWED_TYPES:
abort(400, "type d'image invalide")
filename = basename + "." + img_type
_ensure_directory_exists(filename)
with open(filename, "wb") as f:
f.write(stream.read())
current_app.logger.info(f"sco_logos.store_image %s", filename)
# erase other formats if they exists
for extension in set(scu.LOGOS_IMAGES_ALLOWED_TYPES) - set([img_type]):
try:
os.unlink(basename + "." + extension)
except IOError:
pass