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add new flask example code
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‎content/pages/examples/flask/flask-app-badrequest.markdown‎

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```
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## Example 3 from indico
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[indico](https://github.com/indico/indico)
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([project website](https://getindico.io/),
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[documentation](https://docs.getindico.io/en/stable/installation/)
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and [sandbox demo](https://sandbox.getindico.io/))
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is a [Flask](/flask.html)-based web app for event management.
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The code is open sourced under the
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[MIT license](https://github.com/indico/indico/blob/master/LICENSE).
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[**indico / indico / core / errors.py**](https://github.com/indico/indico/blob/master/indico/core/errors.py)
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```python
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# errors.py
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~~from werkzeug.exceptions import BadRequest, Forbidden, HTTPException, NotFound
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from indico.util.i18n import _
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from indico.util.string import to_unicode
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def get_error_description(exception):
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try:
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description = exception.description
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except AttributeError:
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return to_unicode(exception.message)
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if isinstance(exception, Forbidden) and description == Forbidden.description:
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return _(u"You are not allowed to access this page.")
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elif isinstance(exception, NotFound) and description == NotFound.description:
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return _(u"The page you are looking for doesn't exist.")
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~~ elif isinstance(exception, BadRequest) and description == BadRequest.description:
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return _(u"The request was invalid or contained invalid arguments.")
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else:
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return to_unicode(description)
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class IndicoError(Exception):
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class NoReportError(IndicoError):
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@classmethod
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def wrap_exc(cls, exc):
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assert isinstance(exc, HTTPException)
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exc._disallow_report = True
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return exc
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class UserValueError(NoReportError):
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http_status_code = 400
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## ... source file continues with no further BadRequest examples...
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```
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‎content/pages/examples/flask/flask-app-immutabledict.markdown‎

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title: flask.app ImmutableDict Example Code
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category: page
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slug: flask-app-immutabledict-examples
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sortorder: 500021003
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toc: False
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sidebartitle: flask.app ImmutableDict
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meta: Example code for understanding how to use the ImmutableDict class from the flask.app module of the Flask project.
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ImmutableDict is a class within the flask.app module of the Flask project.
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## Example 1 from indico
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[indico](https://github.com/indico/indico)
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([project website](https://getindico.io/),
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[documentation](https://docs.getindico.io/en/stable/installation/)
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and [sandbox demo](https://sandbox.getindico.io/))
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is a [Flask](/flask.html)-based web app for event management.
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The code is open sourced under the
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[MIT license](https://github.com/indico/indico/blob/master/LICENSE).
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[**indico / indico / core / config.py**](https://github.com/indico/indico/blob/master/indico/core/config.py)
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```python
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# config.py
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from __future__ import absolute_import, unicode_literals
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import ast
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import codecs
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import os
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import re
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import socket
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import warnings
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from datetime import timedelta
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import pytz
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from celery.schedules import crontab
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from flask import current_app, g
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from flask.helpers import get_root_path
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~~from werkzeug.datastructures import ImmutableDict
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from werkzeug.urls import url_parse
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from indico.util.caching import make_hashable
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from indico.util.fs import resolve_link
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from indico.util.packaging import package_is_editable
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from indico.util.string import crc32, snakify
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DEFAULTS = {
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'ATTACHMENT_STORAGE': 'default',
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'AUTH_PROVIDERS': {},
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'BASE_URL': None,
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'CACHE_BACKEND': 'files',
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'CACHE_DIR': '/opt/indico/cache',
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'CATEGORY_CLEANUP': {},
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'CELERY_BROKER': None,
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'CELERY_CONFIG': {},
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'CELERY_RESULT_BACKEND': None,
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'COMMUNITY_HUB_URL': 'https://hub.getindico.io',
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'CUSTOMIZATION_DEBUG': False,
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'CUSTOMIZATION_DIR': None,
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'CUSTOM_COUNTRIES': {},
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'DB_LOG': False,
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'DEBUG': False,
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## ... source file abbreviated to get to ImmutableDict examples ...
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allowed |= set(INTERNAL_DEFAULTS)
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for key in set(data) - allowed:
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warnings.warn('Ignoring unknown config key {}'.format(key))
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return {k: v for k, v in data.iteritems() if k in allowed}
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def load_config(only_defaults=False, override=None):
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data = dict(DEFAULTS, **INTERNAL_DEFAULTS)
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if not only_defaults:
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path = get_config_path()
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config = _sanitize_data(_parse_config(path))
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data.update(config)
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env_override = os.environ.get('INDICO_CONF_OVERRIDE')
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if env_override:
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data.update(_sanitize_data(ast.literal_eval(env_override)))
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resolved_path = resolve_link(path) if os.path.islink(path) else path
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resolved_path = None if resolved_path == os.devnull else resolved_path
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data['CONFIG_PATH'] = path
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data['CONFIG_PATH_RESOLVED'] = resolved_path
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if resolved_path is not None:
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data['LOGGING_CONFIG_PATH'] = os.path.join(os.path.dirname(resolved_path), data['LOGGING_CONFIG_FILE'])
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if override:
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data.update(_sanitize_data(override, allow_internal=True))
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_postprocess_config(data)
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~~ return ImmutableDict(data)
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class IndicoConfig(object):
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__slots__ = ('_config', '_exc')
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def __init__(self, config=None, exc=AttributeError):
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object.__setattr__(self, '_config', config)
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object.__setattr__(self, '_exc', exc)
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@property
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def data(self):
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try:
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return self._config or current_app.config['INDICO']
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except KeyError:
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raise RuntimeError('config not loaded')
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@property
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def hash(self):
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return crc32(repr(make_hashable(sorted(self.data.items()))))
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@property
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def CONFERENCE_CSS_TEMPLATES_BASE_URL(self):
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return self.BASE_URL + '/css/confTemplates'
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## ... source file continues with no further ImmutableDict examples...
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```
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‎content/pages/examples/flask/flask-blueprints-blueprint.markdown‎

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title: flask.blueprints Blueprint Example Code
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category: page
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slug: flask-blueprints-blueprint-examples
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sortorder: 500021003
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sortorder: 500021004
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toc: False
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sidebartitle: flask.blueprints Blueprint
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meta: Example code for understanding how to use the Blueprint class from the flask.blueprints module of the Flask project.

‎content/pages/examples/flask/flask-cli-appgroup.markdown‎

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title: flask.cli AppGroup Example Code
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category: page
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slug: flask-cli-appgroup-examples
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sortorder: 500021005
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toc: False
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sidebartitle: flask.cli AppGroup
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meta: Example code for understanding how to use the AppGroup class from the flask.cli module of the Flask project.
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AppGroup is a class within the flask.cli module of the Flask project.
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## Example 1 from indico
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[indico](https://github.com/indico/indico)
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([project website](https://getindico.io/),
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[documentation](https://docs.getindico.io/en/stable/installation/)
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and [sandbox demo](https://sandbox.getindico.io/))
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is a [Flask](/flask.html)-based web app for event management.
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The code is open sourced under the
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[MIT license](https://github.com/indico/indico/blob/master/LICENSE).
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[**indico / indico / cli / util.py**](https://github.com/indico/indico/blob/master/indico/cli/util.py)
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```python
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# util.py
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from __future__ import unicode_literals
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import traceback
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from importlib import import_module
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import click
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~~from flask.cli import AppGroup, FlaskGroup, ScriptInfo
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from flask_pluginengine import wrap_in_plugin_context
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from werkzeug.utils import cached_property
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def _create_app(info):
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from indico.web.flask.app import make_app
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return make_app(set_path=True)
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class IndicoFlaskGroup(FlaskGroup):
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def __init__(self, **extra):
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super(IndicoFlaskGroup, self).__init__(create_app=_create_app, add_default_commands=False,
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add_version_option=False, set_debug_flag=False, **extra)
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self._indico_plugin_commands = None
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def _load_plugin_commands(self):
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assert False
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def _wrap_in_plugin_context(self, plugin, cmd):
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cmd.callback = wrap_in_plugin_context(plugin, cmd.callback)
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for subcmd in getattr(cmd, 'commands', {}).viewvalues():
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self._wrap_in_plugin_context(plugin, subcmd)
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def _get_indico_plugin_commands(self, ctx):
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if self._indico_plugin_commands is not None:
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return self._indico_plugin_commands
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try:
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from indico.core import signals
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from indico.util.signals import named_objects_from_signal
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ctx.ensure_object(ScriptInfo).load_app()
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cmds = named_objects_from_signal(signals.plugin.cli.send(), plugin_attr='_indico_plugin')
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rv = {}
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for name, cmd in cmds.viewitems():
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if cmd._indico_plugin:
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self._wrap_in_plugin_context(cmd._indico_plugin, cmd)
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rv[name] = cmd
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except Exception as exc:
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if 'No indico config found' not in unicode(exc):
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click.echo(click.style('Loading plugin commands failed:', fg='red', bold=True))
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click.echo(click.style(traceback.format_exc(), fg='red'))
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rv = {}
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self._indico_plugin_commands = rv
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return rv
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def get_command(self, ctx, name):
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~~ rv = AppGroup.get_command(self, ctx, name)
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if rv is not None:
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return rv
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return self._get_indico_plugin_commands(ctx).get(name)
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def list_commands(self, ctx):
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rv = set(click.Group.list_commands(self, ctx))
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rv.update(self._get_indico_plugin_commands(ctx))
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return sorted(rv)
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class LazyGroup(click.Group):
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def __init__(self, import_name, **kwargs):
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self._import_name = import_name
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super(LazyGroup, self).__init__(**kwargs)
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@cached_property
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def _impl(self):
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module, name = self._import_name.split(':', 1)
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return getattr(import_module(module), name)
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def get_command(self, ctx, cmd_name):
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return self._impl.get_command(ctx, cmd_name)
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## ... source file continues with no further AppGroup examples...
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```
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