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error_handler.py
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error_handler.py
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# -*- coding: utf-8 -*-
# This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
# Copyright (C) 2018-2020 OzzieIsaacs
#
# 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 <http://www.gnu.org/licenses/>.
import traceback
from flask import render_template
from werkzeug.exceptions import default_exceptions
try:
from werkzeug.exceptions import FailedDependency
except ImportError:
from werkzeug.exceptions import UnprocessableEntity as FailedDependency
from . import config, app, logger, services
log = logger.create()
# custom error page
def error_http(error):
return render_template('http_error.html',
error_code="Error {0}".format(error.code),
error_name=error.name,
issue=False,
unconfigured=not config.db_configured,
instance=config.config_calibre_web_title
), error.code
def internal_error(error):
return render_template('http_error.html',
error_code="500 Internal Server Error",
error_name='The server encountered an internal error and was unable to complete your '
'request. There is an error in the application.',
issue=True,
unconfigured=False,
error_stack=traceback.format_exc().split("\n"),
instance=config.config_calibre_web_title
), 500
def init_errorhandler():
# http error handling
for ex in default_exceptions:
if ex < 500:
app.register_error_handler(ex, error_http)
elif ex == 500:
app.register_error_handler(ex, internal_error)
if services.ldap:
# Only way of catching the LDAPException upon logging in with LDAP server down
@app.errorhandler(services.ldap.LDAPException)
# pylint: disable=unused-variable
def handle_exception(e):
log.debug('LDAP server not accessible while trying to login to opds feed')
return error_http(FailedDependency())