ScoDoc-PE/app/decorators.py

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# -*- coding: UTF-8 -*
"""Decorators for permissions, roles and ScoDoc7 Zope compatibility
"""
import functools
from functools import wraps
import inspect
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import types
import logging
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import werkzeug
from werkzeug.exceptions import BadRequest
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import flask
from flask import g, current_app, request
from flask import abort, url_for, redirect
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from flask_login import current_user
from flask_login import login_required
import flask_login
import app
from app.auth.models import User
import app.scodoc.sco_utils as scu
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class ZUser(object):
"Emulating Zope User"
def __init__(self):
"create, based on `flask_login.current_user`"
self.username = current_user.user_name
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def __str__(self):
return self.username
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def has_permission(self, perm, dept=None):
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"""check if this user as the permission `perm`
in departement given by `g.scodoc_dept`.
"""
raise NotImplementedError()
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def scodoc(func):
"""Décorateur pour toutes les fonctions ScoDoc
Affecte le département à g
et ouvre la connexion à la base
Set `g.scodoc_dept` and `g.scodoc_dept_id` if `scodoc_dept` is present
in the argument (for routes like
`/<scodoc_dept>/Scolarite/sco_exemple`).
"""
@wraps(func)
def scodoc_function(*args, **kwargs):
# interdit les POST si pas loggué
if request.method == "POST" and not current_user.is_authenticated:
current_app.logger.info("POST by non authenticated user")
return redirect(
url_for(
"auth.login",
message="La page a expiré. Identifiez-vous et recommencez l'opération",
)
)
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if "scodoc_dept" in kwargs:
dept_acronym = kwargs["scodoc_dept"]
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# current_app.logger.info("setting dept to " + dept_acronym)
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app.set_sco_dept(dept_acronym)
del kwargs["scodoc_dept"]
elif not hasattr(g, "scodoc_dept"):
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# current_app.logger.info("setting dept to None")
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g.scodoc_dept = None
g.scodoc_dept_id = -1 # invalide
return func(*args, **kwargs)
return scodoc_function
def permission_required(permission):
def decorator(f):
@wraps(f)
def decorated_function(*args, **kwargs):
scodoc_dept = getattr(g, "scodoc_dept", None)
if not current_user.has_permission(permission, scodoc_dept):
abort(403)
return f(*args, **kwargs)
return login_required(decorated_function)
return decorator
def permission_required_compat_scodoc7(permission):
"""Décorateur pour les fonctions utilisées comme API dans ScoDoc 7
Comme @permission_required mais autorise de passer directement
les informations d'auth en paramètres:
__ac_name, __ac_password
"""
def decorator(f):
@wraps(f)
def decorated_function(*args, **kwargs):
# current_app.logger.warning("PERMISSION; kwargs=%s" % str(kwargs))
# cherche les paramètre d'auth:
auth_ok = False
if request.method == "GET":
user_name = request.args.get("__ac_name")
user_password = request.args.get("__ac_password")
elif request.method == "POST":
user_name = request.form.get("__ac_name")
user_password = request.form.get("__ac_password")
else:
abort(405) # method not allowed
if user_name and user_password:
u = User.query.filter_by(user_name=user_name).first()
if u and u.check_password(user_password):
auth_ok = True
flask_login.login_user(u)
# reprend le chemin classique:
scodoc_dept = getattr(g, "scodoc_dept", None)
if not current_user.has_permission(permission, scodoc_dept):
abort(403)
if auth_ok:
return f(*args, **kwargs)
else:
return login_required(f)(*args, **kwargs)
return decorated_function
return decorator
def admin_required(f):
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from app.auth.models import Permission
return permission_required(Permission.ScoSuperAdmin)(f)
def scodoc7func(func):
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"""Décorateur pour intégrer les fonctions Zope 2 de ScoDoc 7.
Les paramètres de la query string deviennent des (keywords) paramètres de la fonction.
"""
@wraps(func)
def scodoc7func_decorator(*args, **kwargs):
"""Decorator allowing legacy Zope published methods to be called via Flask
routes without modification.
There are two cases: the function can be called
1. via a Flask route ("top level call")
2. or be called directly from Python.
"""
# Détermine si on est appelé via une route ("toplevel")
# ou par un appel de fonction python normal.
top_level = not hasattr(g, "scodoc7_decorated")
if not top_level:
# ne "redécore" pas
return func(*args, **kwargs)
g.scodoc7_decorated = True
# --- Emulate Zope's REQUEST
# REQUEST = ZRequest()
# g.zrequest = REQUEST
# args from query string (get) or form (post)
req_args = scu.get_request_args()
## --- Add positional arguments
pos_arg_values = []
argspec = inspect.getfullargspec(func)
# current_app.logger.info("argspec=%s" % str(argspec))
nb_default_args = len(argspec.defaults) if argspec.defaults else 0
if nb_default_args:
arg_names = argspec.args[:-nb_default_args]
else:
arg_names = argspec.args
for arg_name in arg_names: # pour chaque arg de la fonction vue
if arg_name == "REQUEST": # ne devrait plus arriver !
# debug check, TODO remove after tests
raise ValueError("invalid REQUEST parameter !")
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else:
# peut produire une KeyError s'il manque un argument attendu:
v = req_args[arg_name]
# try to convert all arguments to INTEGERS
# necessary for db ids and boolean values
try:
v = int(v)
except ValueError:
pass
pos_arg_values.append(v)
# current_app.logger.info("pos_arg_values=%s" % pos_arg_values)
# current_app.logger.info("req_args=%s" % req_args)
# Add keyword arguments
if nb_default_args:
for arg_name in argspec.args[-nb_default_args:]:
# if arg_name == "REQUEST": # special case
# kwargs[arg_name] = REQUEST
if arg_name in req_args:
# set argument kw optionnel
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v = req_args[arg_name]
# try to convert all arguments to INTEGERS
# necessary for db ids and boolean values
try:
v = int(v)
except (ValueError, TypeError):
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pass
kwargs[arg_name] = v
# current_app.logger.info(
# "scodoc7func_decorator: top_level=%s, pos_arg_values=%s, kwargs=%s"
# % (top_level, pos_arg_values, kwargs)
# )
value = func(*pos_arg_values, **kwargs)
if not top_level:
return value
else:
if isinstance(value, werkzeug.wrappers.response.Response):
return value # redirected
# Build response, adding collected http headers:
headers = []
kw = {"response": value, "status": 200}
# if g.zrequest:
# headers = g.zrequest.RESPONSE.headers
# if not headers:
# # no customized header, speedup:
# return value
# if "content-type" in headers:
# kw["mimetype"] = headers["content-type"]
r = flask.Response(**kw)
for h in headers:
r.headers[h] = headers[h]
return r
return scodoc7func_decorator