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Ecriture des fonctions d'accés aux logos (et aux images)

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This commit is contained in:
Jean-Marie Place 2021-11-07 08:53:44 +01:00
parent 915d4059a7
commit 5e461f7dd6
2 changed files with 180 additions and 42 deletions
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217
app/scodoc/sco_logos.py
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@ -34,30 +34,188 @@ SCODOC_LOGOS_DIR /opt/scodoc-data/config/logos
""" """
import imghdr import imghdr
import os import os
import re
from pathlib import Path
from flask import abort, current_app from flask import abort, current_app, url_for
from werkzeug.utils import secure_filename
from app import Departement, ScoValueError
from app.scodoc import sco_utils as scu from app.scodoc import sco_utils as scu
from PIL import Image as PILImage
GLOBAL = "_GLOBAL" # category for server level logos
def get_logo_filename(logo_type: str, scodoc_dept: str) -> str: def find_logo(logoname, dept_id=None, strict=False, prefix=scu.LOGO_FILE_PREFIX):
"""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>), "Recherche un logo 'name' existant.
# then in config dir /opt/scodoc-data/config/logos/ Deux strategies:
for image_dir in ( si strict:
scu.SCODOC_LOGOS_DIR + "/logos_" + scodoc_dept, reherche uniquement dans le département puis si non trouvé au niveau global
scu.SCODOC_LOGOS_DIR, # global logos sinon
): On recherche en local au dept d'abord puis si pas trouvé recherche globale
for suffix in scu.LOGOS_IMAGES_ALLOWED_TYPES: quelque soit la stratégie, retourne None si pas trouvé
filename = os.path.join(image_dir, f"logo_{logo_type}.{suffix}") :param logoname: le nom recherche
if os.path.isfile(filename) and os.access(filename, os.R_OK): :param dept_id: l'id du département dans lequel se fait la recherche (None si global)
return filename :param strict: stratégie de recherche (strict = False => dept ou global)
:param prefix: le prefix utilisé (parmi scu.LOGO_FILE_PREFIX / scu.BACKGROUND_FILE_PREFIX)
:return: un objet Logo désignant le fichier image trouvé (ou None)
"""
logo = Logo(logoname, dept_id, prefix).select()
if logo is None and not strict:
logo = Logo(logoname=logoname, dept_id=None, prefix=prefix).select()
return logo
return ""
def write_logo(stream, name, dept_id=None):
"""Crée le fichier logo sur le serveur.
Le suffixe du fichier (parmi LOGO_IMAGES_ALLOWED_TYPES) est déduit du contenu du stream"""
Logo(logoname=name, dept_id=dept_id).create(stream)
def list_logos():
"""Crée l'inventaire de tous les logos existants.
L'inventaire se présente comme un dictionnaire de dictionnaire de Logo:
[GLOBAL][name] pour les logos globaux
[dept_id][name] pour les logos propres à un département (attention id numérique du dept)
"""
inventory = {GLOBAL: _list_dept_logos()} # logos globaux (header / footer)
for dept in Departement.query.filter_by(visible=True).all():
logos_dept = _list_dept_logos(dept_id=dept.id)
if logos_dept:
inventory[dept.acronym] = _list_dept_logos(dept.id)
return inventory
def _list_dept_logos(dept_id=None, prefix=scu.LOGO_FILE_PREFIX):
"""nventorie toutes les images existantes pour un niveau (GLOBAL ou un département).
retourne un dictionnaire de Logo [logoname] -> Logo
les noms des fichiers concernés doivent être de la forme: <rep>/<prefix><name>.<suffixe>
<rep> : répertoire de recherche (déduit du dept_id)
<prefix>: le prefix (LOGO_FILE_PREFIX pour les logos)
<suffix>: un des suffixes autorisés
:param dept_id: l'id du departement concerné (si None -> global)
:param prefix: le préfixe utilisé
:return: le résultat de la recherche ou None si aucune image trouvée
"""
allowed_ext = "|".join(scu.LOGOS_IMAGES_ALLOWED_TYPES)
filename_parser = re.compile(f"{prefix}([^.]*).({allowed_ext})")
logos = {}
path_dir = Path(scu.SCODOC_LOGOS_DIR)
if dept_id:
path_dir = Path(
os.path.sep.join(
[scu.SCODOC_LOGOS_DIR, scu.LOGOS_DIR_PREFIX + str(dept_id)]
)
)
if path_dir.exists():
for entry in path_dir.iterdir():
if os.access(path_dir.joinpath(entry).absolute(), os.R_OK):
result = filename_parser.match(entry.name)
if result:
logoname = result.group(1)
logos[logoname] = Logo(logoname=logoname, dept_id=dept_id).select()
return logos if len(logos.keys()) > 0 else None
class Logo:
"""Responsable des opérations (select, create), du calcul des chemins et url
ainsi que de la récupération des informations sur un logp.
Usage:
logo existant: Logo(<name>, <dept_id>, ...).select() (retourne None si fichier non trouvé)
logo en création: Logo(<name>, <dept_id>, ...).create(stream)
Les attributs filename, filepath, get_url() ne devraient pas être utilisés avant les opérations
select ou save (le format n'est pas encore connu à ce moement là)
"""
def __init__(self, logoname, dept_id=None, prefix=scu.LOGO_FILE_PREFIX):
"""Initialisation des noms et département des logos.
if prefix = None on recherche simplement une image 'logoname.*'
Le format est renseigné au moment de la lecture (select) ou de la création (create) de l'objet
"""
self.logoname = secure_filename(logoname)
self.scodoc_dept_id = dept_id
self.prefix = prefix or ""
self.suffix = None
self.dimensions = None
if self.scodoc_dept_id:
self.dirpath = os.path.sep.join(
[
scu.SCODOC_LOGOS_DIR,
scu.LOGOS_DIR_PREFIX + secure_filename(str(dept_id)),
]
)
else:
self.dirpath = scu.SCODOC_LOGOS_DIR
self.basepath = os.path.sep.join(
[self.dirpath, self.prefix + secure_filename(self.logoname)]
)
self.filepath = None
self.filename = None
def _set_format(self, fmt):
self.suffix = fmt
self.filepath = self.basepath + "." + fmt
self.filename = self.logoname + "." + fmt
def _ensure_directory_exists(self):
"create enclosing directory if necessary"
if not Path(self.dirpath).exists():
current_app.logger.info(f"sco_logos creating directory %s", self.dirpath)
os.mkdir(self.dirpath)
def create(self, stream):
img_type = guess_image_type(stream)
if img_type not in scu.LOGOS_IMAGES_ALLOWED_TYPES:
abort(400, "type d'image invalide")
self._set_format(img_type)
self._ensure_directory_exists()
filename = self.basepath + "." + self.suffix
with open(filename, "wb") as f:
f.write(stream.read())
current_app.logger.info(f"sco_logos.store_image %s", self.filename)
# erase other formats if they exists
for suffix in set(scu.LOGOS_IMAGES_ALLOWED_TYPES) - set([img_type]):
try:
os.unlink(self.basepath + "." + suffix)
except IOError:
pass
def select(self):
"""
Récupération des données pour un logo existant
il doit exister un et un seul fichier image parmi de suffixe/types autorisés
(sinon on prend le premier trouvé)
cette opération permet d'affiner le format d'un logo de format inconnu
"""
for suffix in scu.LOGOS_IMAGES_ALLOWED_TYPES:
path = Path(self.basepath + "." + suffix)
if path.exists():
self._set_format(suffix)
with open(self.filepath, "rb") as f:
img = PILImage.open(f)
self.dimensions = img.size
return self
return None
def get_url(self):
"""Retourne l'URL permettant d'obtenir l'image du logo"""
return url_for(
"scodoc.get_logo",
scodoc_dept=self.scodoc_dept_id,
name=self.logoname,
global_if_not_found=False,
)
def get_url_small(self):
"""Retourne l'URL permettant d'obtenir l'image du logo sous forme de miniature"""
return url_for(
"scodoc.get_logo_small",
scodoc_dept=self.scodoc_dept_id,
name=self.logoname,
global_if_not_found=False,
)
def guess_image_type(stream) -> str: def guess_image_type(stream) -> str:
@ -68,28 +226,3 @@ def guess_image_type(stream) -> str:
if not fmt: if not fmt:
return None return None
return fmt if fmt != "jpeg" else "jpg" 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

5
app/scodoc/sco_utils.py
View File

@ -283,7 +283,12 @@ if not os.path.exists(SCO_TMP_DIR) and os.path.exists(Config.SCODOC_VAR_DIR):
# ----- Les logos: /opt/scodoc-data/config/logos # ----- Les logos: /opt/scodoc-data/config/logos
SCODOC_LOGOS_DIR = os.path.join(SCODOC_CFG_DIR, "logos") SCODOC_LOGOS_DIR = os.path.join(SCODOC_CFG_DIR, "logos")
LOGOS_IMAGES_ALLOWED_TYPES = ("jpg", "jpeg", "png") # remind that PIL does not read pdf LOGOS_IMAGES_ALLOWED_TYPES = ("jpg", "jpeg", "png") # remind that PIL does not read pdf
LOGOS_DIR_PREFIX = "logos_"
LOGO_FILE_PREFIX = "logo_"
# forme générale des noms des fichiers logos/background:
# SCODOC_LOGO_DIR/LOGO_FILE_PREFIX<name>.<suffix> (fichier global) ou
# SCODOC_LOGO_DIR/LOGOS_DIR_PREFIX<dept_id>/LOGO_FILE_PREFIX<name>.<suffix> (fichier départemental)
# ----- Les outils distribués # ----- Les outils distribués
SCO_TOOLS_DIR = os.path.join(Config.SCODOC_DIR, "tools") SCO_TOOLS_DIR = os.path.join(Config.SCODOC_DIR, "tools")