215 lines
7.9 KiB
Python
215 lines
7.9 KiB
Python
# -*- mode: python -*-
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# -*- coding: utf-8 -*-
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##############################################################################
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#
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# Gestion scolarite IUT
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#
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# Copyright (c) 1999 - 2021 Emmanuel Viennet. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Emmanuel Viennet emmanuel.viennet@viennet.net
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#
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##############################################################################
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"""Gestion des images logos (nouveau ScoDoc 9)
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Les logos sont `logo_header.<ext>` et `logo_footer.<ext>`
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avec `ext` membre de LOGOS_IMAGES_ALLOWED_TYPES (= jpg, png)
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SCODOC_LOGOS_DIR /opt/scodoc-data/config/logos
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"""
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import imghdr
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import os
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import re
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from pathlib import Path
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from flask import abort, current_app, url_for
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from werkzeug.utils import secure_filename
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from app import Departement, ScoValueError
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from app.scodoc import sco_utils as scu
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import PIL
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from PIL import Image as PILImage
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GLOBAL = "_SERVER" # category for server level logos
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def find_logo(logoname, dept_id=None, global_if_not_found=True, prefix=scu.LOGO_FILE_PREFIX):
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"""
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"Recherche un logo 'name' existant.
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Deux strategies:
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si global_if_not_found:
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On recherche en local au dept d'abord puis si pas trouvé recherche globale
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sinon
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reherche uniquement dans le département puis si non trouvé au niveau global
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quelquesoit la stratégie, retourne None si pas trouvé
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:param logoname: le nom recherche
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:param dept_id: l'id du département dans lequel se fait la recherche (None si global)
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:param global_if_not_found: stratégie de recherche
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:param prefix: le prefix utilisé (parmi scu.LOGO_FILE_PREFIX / scu.BACKGROUND_FILE_PREFIX)
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:return: un objet Logo désignant le fichier image trouvé (ou None)
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"""
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try:
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logo = Logo(logoname, dept_id, prefix).read()
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except ScoValueError:
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logo = None
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if logo is None and global_if_not_found:
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try:
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logo = Logo(logoname=logoname, dept_id=None), prefix.read()
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except ScoValueError:
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logo = None
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return logo
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def get_logo_filename(name, dept_id=None):
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breakpoint()
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return find_logo(name, dept_id).read().filepath
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def get_logo_url(name, dept_id):
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return find_logo(name, dept_id).read().get_url()
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def write_logo(stream, name, dept_id=None):
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Logo(logoname=name, dept_id=dept_id).create(stream)
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def list_logos():
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inventory = {GLOBAL: _list_dept_logos()} # logos globaux (header / footer)
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for dept in Departement.query.filter_by(visible=True).all():
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logos_dept = _list_dept_logos(dept_id=dept.id)
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if logos_dept:
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inventory[dept.acronym] = _list_dept_logos(dept.id)
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return inventory
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def _list_dept_logos(dept_id=None, prefix=scu.LOGO_FILE_PREFIX):
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"Inventorie tous les logos existants (retourne un dictionnaire de dictionnaires [dept_id][logoname]"
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allowed_ext = "|".join(scu.LOGOS_IMAGES_ALLOWED_TYPES)
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filename_parser = re.compile(f"{prefix}([^.]*).({allowed_ext})")
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logos = {}
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path_dir = Path(scu.SCODOC_LOGOS_DIR)
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if dept_id:
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path_dir = Path(
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os.path.sep.join([scu.SCODOC_LOGOS_DIR, LOGOS_DIR_PREFIX + str(dept_id)])
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)
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if path_dir.exists():
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for entry in path_dir.iterdir():
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if os.access(path_dir.joinpath(entry).absolute(), os.R_OK):
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result = filename_parser.match(entry.name)
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if result:
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logoname = result.group(1)
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logos[logoname] = Logo(logoname=logoname, dept_id=dept_id).read()
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return logos if len(logos.keys()) > 0 else None
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class Logo:
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"""Responsable des opérations (read, create), du calcul des chemins et url
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et de la récupération des informations sur un logp.
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Usage:
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logo existant: Logo(<name>, <dept_id>, ...).read()
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logo en création: Logo(<name>, <dept_id>, ...).create(stream)
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Les attributs filename, filepath, get_url() ne devraient pas être utilisés avant les opérations
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read ou save (le format n'est pas encore connu à ce moement là)
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"""
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def __init__(self, logoname, dept_id=None, prefix=scu.LOGO_FILE_PREFIX):
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"""Initialisation des noms et département des logos.
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if prefix = None on recherche simplement une image 'logoname.*'
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Le format est renseigné au moment de la lecture (read) ou de la création (create) de l'objet
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"""
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self.logoname = secure_filename(logoname)
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self.scodoc_dept = dept_id
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self.prefix = prefix or ""
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self.suffix = None
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self.dimensions = None
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if self.scodoc_dept:
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self.dirpath = os.path.sep.join(
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[scu.SCODOC_LOGOS_DIR, scu.LOGOS_DIR_PREFIX + secure_filename(str(dept_id))]
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)
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else:
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self.dirpath = scu.SCODOC_LOGOS_DIR
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self.basepath = os.path.sep.join(
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[self.dirpath, self.prefix + secure_filename(self.logoname)]
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)
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self.filepath = None
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self.filename = None
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def set_format(self, fmt):
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self.suffix = fmt
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self.filepath = self.basepath + "." + fmt
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self.filename = self.logoname + "." + fmt
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def _ensure_directory_exists(self):
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"create enclosing directory if necessary"
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if not Path(self.dirpath).exists():
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current_app.logger.info(f"sco_logos creating directory %s", self.dirpath)
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os.mkdir(self.dirpath)
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def create(self, stream):
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img_type = guess_image_type(stream)
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if img_type not in scu.LOGOS_IMAGES_ALLOWED_TYPES:
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abort(400, "type d'image invalide")
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self.set_format(img_type)
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self._ensure_directory_exists()
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filename = self.basepath + "." + self.suffix
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with open(filename, "wb") as f:
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f.write(stream.read())
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current_app.logger.info(f"sco_logos.store_image %s", self.filename)
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# erase other formats if they exists
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for suffix in set(scu.LOGOS_IMAGES_ALLOWED_TYPES) - set([img_type]):
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try:
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os.unlink(self.basepath + "." + suffix)
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except IOError:
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pass
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def read(self):
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"""
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Récupération des données pour un logo existant (sinon -> Exception)
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il doit exister un et un seul fichier image parmi les types autorisés
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(sinon on considère le premier trouvé)
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permet d'affiner le format d'un logo de format inconnu
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"""
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for suffix in scu.LOGOS_IMAGES_ALLOWED_TYPES:
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path = Path(self.basepath + "." + suffix)
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if path.exists():
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self.set_format(suffix)
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with open(self.filepath, "rb") as f:
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img = PILImage.open(f)
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self.dimensions = img.size
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return self
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# if no file found, raise exception
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raise ScoValueError(
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"Logo %s not found for dept %s" % (self.logoname, self.scodoc_dept)
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)
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def get_url(self):
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if self.scodoc_dept
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return url_for(
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"scodoc.logo_custom", scodoc_dept=self.scodoc_dept, name=self.logoname
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)
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def guess_image_type(stream) -> str:
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"guess image type from header in stream"
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header = stream.read(512)
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stream.seek(0)
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fmt = imghdr.what(None, header)
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if not fmt:
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return None
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return fmt if fmt != "jpeg" else "jpg"
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