965 lines
37 KiB
Python
965 lines
37 KiB
Python
from __future__ import annotations
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import logging
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import os
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import sys
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import typing as t
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from datetime import timedelta
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from itertools import chain
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from werkzeug.exceptions import Aborter
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from werkzeug.exceptions import BadRequest
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from werkzeug.exceptions import BadRequestKeyError
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from werkzeug.routing import BuildError
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from werkzeug.routing import Map
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from werkzeug.routing import Rule
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from werkzeug.sansio.response import Response
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from werkzeug.utils import cached_property
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from werkzeug.utils import redirect as _wz_redirect
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from .. import typing as ft
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from ..config import Config
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from ..config import ConfigAttribute
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from ..ctx import _AppCtxGlobals
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from ..helpers import _split_blueprint_path
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from ..helpers import get_debug_flag
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from ..json.provider import DefaultJSONProvider
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from ..json.provider import JSONProvider
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from ..logging import create_logger
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from ..templating import DispatchingJinjaLoader
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from ..templating import Environment
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from .scaffold import _endpoint_from_view_func
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from .scaffold import find_package
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from .scaffold import Scaffold
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from .scaffold import setupmethod
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if t.TYPE_CHECKING: # pragma: no cover
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from werkzeug.wrappers import Response as BaseResponse
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from ..testing import FlaskClient
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from ..testing import FlaskCliRunner
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from .blueprints import Blueprint
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T_shell_context_processor = t.TypeVar(
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"T_shell_context_processor", bound=ft.ShellContextProcessorCallable
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)
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T_teardown = t.TypeVar("T_teardown", bound=ft.TeardownCallable)
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T_template_filter = t.TypeVar("T_template_filter", bound=ft.TemplateFilterCallable)
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T_template_global = t.TypeVar("T_template_global", bound=ft.TemplateGlobalCallable)
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T_template_test = t.TypeVar("T_template_test", bound=ft.TemplateTestCallable)
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def _make_timedelta(value: timedelta | int | None) -> timedelta | None:
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if value is None or isinstance(value, timedelta):
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return value
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return timedelta(seconds=value)
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class App(Scaffold):
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"""The flask object implements a WSGI application and acts as the central
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object. It is passed the name of the module or package of the
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application. Once it is created it will act as a central registry for
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the view functions, the URL rules, template configuration and much more.
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The name of the package is used to resolve resources from inside the
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package or the folder the module is contained in depending on if the
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package parameter resolves to an actual python package (a folder with
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an :file:`__init__.py` file inside) or a standard module (just a ``.py`` file).
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For more information about resource loading, see :func:`open_resource`.
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Usually you create a :class:`Flask` instance in your main module or
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in the :file:`__init__.py` file of your package like this::
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from flask import Flask
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app = Flask(__name__)
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.. admonition:: About the First Parameter
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The idea of the first parameter is to give Flask an idea of what
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belongs to your application. This name is used to find resources
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on the filesystem, can be used by extensions to improve debugging
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information and a lot more.
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So it's important what you provide there. If you are using a single
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module, `__name__` is always the correct value. If you however are
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using a package, it's usually recommended to hardcode the name of
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your package there.
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For example if your application is defined in :file:`yourapplication/app.py`
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you should create it with one of the two versions below::
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app = Flask('yourapplication')
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app = Flask(__name__.split('.')[0])
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Why is that? The application will work even with `__name__`, thanks
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to how resources are looked up. However it will make debugging more
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painful. Certain extensions can make assumptions based on the
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import name of your application. For example the Flask-SQLAlchemy
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extension will look for the code in your application that triggered
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an SQL query in debug mode. If the import name is not properly set
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up, that debugging information is lost. (For example it would only
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pick up SQL queries in `yourapplication.app` and not
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`yourapplication.views.frontend`)
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.. versionadded:: 0.7
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The `static_url_path`, `static_folder`, and `template_folder`
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parameters were added.
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.. versionadded:: 0.8
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The `instance_path` and `instance_relative_config` parameters were
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added.
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.. versionadded:: 0.11
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The `root_path` parameter was added.
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.. versionadded:: 1.0
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The ``host_matching`` and ``static_host`` parameters were added.
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.. versionadded:: 1.0
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The ``subdomain_matching`` parameter was added. Subdomain
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matching needs to be enabled manually now. Setting
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:data:`SERVER_NAME` does not implicitly enable it.
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:param import_name: the name of the application package
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:param static_url_path: can be used to specify a different path for the
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static files on the web. Defaults to the name
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of the `static_folder` folder.
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:param static_folder: The folder with static files that is served at
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``static_url_path``. Relative to the application ``root_path``
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or an absolute path. Defaults to ``'static'``.
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:param static_host: the host to use when adding the static route.
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Defaults to None. Required when using ``host_matching=True``
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with a ``static_folder`` configured.
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:param host_matching: set ``url_map.host_matching`` attribute.
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Defaults to False.
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:param subdomain_matching: consider the subdomain relative to
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:data:`SERVER_NAME` when matching routes. Defaults to False.
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:param template_folder: the folder that contains the templates that should
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be used by the application. Defaults to
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``'templates'`` folder in the root path of the
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application.
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:param instance_path: An alternative instance path for the application.
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By default the folder ``'instance'`` next to the
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package or module is assumed to be the instance
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path.
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:param instance_relative_config: if set to ``True`` relative filenames
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for loading the config are assumed to
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be relative to the instance path instead
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of the application root.
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:param root_path: The path to the root of the application files.
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This should only be set manually when it can't be detected
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automatically, such as for namespace packages.
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"""
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#: The class of the object assigned to :attr:`aborter`, created by
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#: :meth:`create_aborter`. That object is called by
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#: :func:`flask.abort` to raise HTTP errors, and can be
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#: called directly as well.
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#:
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#: Defaults to :class:`werkzeug.exceptions.Aborter`.
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#:
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#: .. versionadded:: 2.2
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aborter_class = Aborter
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#: The class that is used for the Jinja environment.
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#:
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#: .. versionadded:: 0.11
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jinja_environment = Environment
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#: The class that is used for the :data:`~flask.g` instance.
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#:
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#: Example use cases for a custom class:
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#:
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#: 1. Store arbitrary attributes on flask.g.
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#: 2. Add a property for lazy per-request database connectors.
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#: 3. Return None instead of AttributeError on unexpected attributes.
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#: 4. Raise exception if an unexpected attr is set, a "controlled" flask.g.
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#:
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#: In Flask 0.9 this property was called `request_globals_class` but it
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#: was changed in 0.10 to :attr:`app_ctx_globals_class` because the
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#: flask.g object is now application context scoped.
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#:
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#: .. versionadded:: 0.10
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app_ctx_globals_class = _AppCtxGlobals
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#: The class that is used for the ``config`` attribute of this app.
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#: Defaults to :class:`~flask.Config`.
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#:
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#: Example use cases for a custom class:
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#:
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#: 1. Default values for certain config options.
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#: 2. Access to config values through attributes in addition to keys.
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#:
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#: .. versionadded:: 0.11
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config_class = Config
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#: The testing flag. Set this to ``True`` to enable the test mode of
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#: Flask extensions (and in the future probably also Flask itself).
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#: For example this might activate test helpers that have an
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#: additional runtime cost which should not be enabled by default.
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#:
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#: If this is enabled and PROPAGATE_EXCEPTIONS is not changed from the
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#: default it's implicitly enabled.
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#:
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#: This attribute can also be configured from the config with the
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#: ``TESTING`` configuration key. Defaults to ``False``.
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testing = ConfigAttribute[bool]("TESTING")
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#: If a secret key is set, cryptographic components can use this to
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#: sign cookies and other things. Set this to a complex random value
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#: when you want to use the secure cookie for instance.
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#:
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#: This attribute can also be configured from the config with the
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#: :data:`SECRET_KEY` configuration key. Defaults to ``None``.
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secret_key = ConfigAttribute[t.Union[str, bytes, None]]("SECRET_KEY")
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#: A :class:`~datetime.timedelta` which is used to set the expiration
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#: date of a permanent session. The default is 31 days which makes a
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#: permanent session survive for roughly one month.
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#:
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#: This attribute can also be configured from the config with the
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#: ``PERMANENT_SESSION_LIFETIME`` configuration key. Defaults to
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#: ``timedelta(days=31)``
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permanent_session_lifetime = ConfigAttribute[timedelta](
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"PERMANENT_SESSION_LIFETIME",
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get_converter=_make_timedelta, # type: ignore[arg-type]
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)
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json_provider_class: type[JSONProvider] = DefaultJSONProvider
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"""A subclass of :class:`~flask.json.provider.JSONProvider`. An
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instance is created and assigned to :attr:`app.json` when creating
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the app.
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The default, :class:`~flask.json.provider.DefaultJSONProvider`, uses
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Python's built-in :mod:`json` library. A different provider can use
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a different JSON library.
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.. versionadded:: 2.2
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"""
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#: Options that are passed to the Jinja environment in
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#: :meth:`create_jinja_environment`. Changing these options after
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#: the environment is created (accessing :attr:`jinja_env`) will
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#: have no effect.
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#:
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#: .. versionchanged:: 1.1.0
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#: This is a ``dict`` instead of an ``ImmutableDict`` to allow
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#: easier configuration.
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#:
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jinja_options: dict[str, t.Any] = {}
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#: The rule object to use for URL rules created. This is used by
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#: :meth:`add_url_rule`. Defaults to :class:`werkzeug.routing.Rule`.
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#:
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#: .. versionadded:: 0.7
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url_rule_class = Rule
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#: The map object to use for storing the URL rules and routing
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#: configuration parameters. Defaults to :class:`werkzeug.routing.Map`.
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#:
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#: .. versionadded:: 1.1.0
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url_map_class = Map
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#: The :meth:`test_client` method creates an instance of this test
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#: client class. Defaults to :class:`~flask.testing.FlaskClient`.
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#:
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#: .. versionadded:: 0.7
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test_client_class: type[FlaskClient] | None = None
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#: The :class:`~click.testing.CliRunner` subclass, by default
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#: :class:`~flask.testing.FlaskCliRunner` that is used by
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#: :meth:`test_cli_runner`. Its ``__init__`` method should take a
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#: Flask app object as the first argument.
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#:
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#: .. versionadded:: 1.0
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test_cli_runner_class: type[FlaskCliRunner] | None = None
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default_config: dict[str, t.Any]
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response_class: type[Response]
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def __init__(
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self,
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import_name: str,
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static_url_path: str | None = None,
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static_folder: str | os.PathLike[str] | None = "static",
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static_host: str | None = None,
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host_matching: bool = False,
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subdomain_matching: bool = False,
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template_folder: str | os.PathLike[str] | None = "templates",
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instance_path: str | None = None,
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instance_relative_config: bool = False,
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root_path: str | None = None,
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) -> None:
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super().__init__(
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import_name=import_name,
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static_folder=static_folder,
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static_url_path=static_url_path,
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template_folder=template_folder,
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root_path=root_path,
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)
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if instance_path is None:
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instance_path = self.auto_find_instance_path()
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elif not os.path.isabs(instance_path):
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raise ValueError(
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"If an instance path is provided it must be absolute."
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" A relative path was given instead."
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)
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#: Holds the path to the instance folder.
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#:
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#: .. versionadded:: 0.8
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self.instance_path = instance_path
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#: The configuration dictionary as :class:`Config`. This behaves
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#: exactly like a regular dictionary but supports additional methods
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#: to load a config from files.
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self.config = self.make_config(instance_relative_config)
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#: An instance of :attr:`aborter_class` created by
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#: :meth:`make_aborter`. This is called by :func:`flask.abort`
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#: to raise HTTP errors, and can be called directly as well.
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#:
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#: .. versionadded:: 2.2
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#: Moved from ``flask.abort``, which calls this object.
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self.aborter = self.make_aborter()
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self.json: JSONProvider = self.json_provider_class(self)
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"""Provides access to JSON methods. Functions in ``flask.json``
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will call methods on this provider when the application context
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is active. Used for handling JSON requests and responses.
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An instance of :attr:`json_provider_class`. Can be customized by
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changing that attribute on a subclass, or by assigning to this
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attribute afterwards.
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The default, :class:`~flask.json.provider.DefaultJSONProvider`,
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uses Python's built-in :mod:`json` library. A different provider
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can use a different JSON library.
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.. versionadded:: 2.2
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"""
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#: A list of functions that are called by
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#: :meth:`handle_url_build_error` when :meth:`.url_for` raises a
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#: :exc:`~werkzeug.routing.BuildError`. Each function is called
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#: with ``error``, ``endpoint`` and ``values``. If a function
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#: returns ``None`` or raises a ``BuildError``, it is skipped.
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#: Otherwise, its return value is returned by ``url_for``.
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#:
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#: .. versionadded:: 0.9
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self.url_build_error_handlers: list[
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t.Callable[[Exception, str, dict[str, t.Any]], str]
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] = []
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#: A list of functions that are called when the application context
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#: is destroyed. Since the application context is also torn down
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#: if the request ends this is the place to store code that disconnects
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#: from databases.
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#:
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#: .. versionadded:: 0.9
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self.teardown_appcontext_funcs: list[ft.TeardownCallable] = []
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#: A list of shell context processor functions that should be run
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#: when a shell context is created.
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#:
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#: .. versionadded:: 0.11
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self.shell_context_processors: list[ft.ShellContextProcessorCallable] = []
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#: Maps registered blueprint names to blueprint objects. The
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#: dict retains the order the blueprints were registered in.
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#: Blueprints can be registered multiple times, this dict does
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#: not track how often they were attached.
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#:
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#: .. versionadded:: 0.7
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self.blueprints: dict[str, Blueprint] = {}
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#: a place where extensions can store application specific state. For
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#: example this is where an extension could store database engines and
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#: similar things.
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#:
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#: The key must match the name of the extension module. For example in
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#: case of a "Flask-Foo" extension in `flask_foo`, the key would be
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#: ``'foo'``.
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#:
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#: .. versionadded:: 0.7
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self.extensions: dict[str, t.Any] = {}
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#: The :class:`~werkzeug.routing.Map` for this instance. You can use
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#: this to change the routing converters after the class was created
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#: but before any routes are connected. Example::
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#:
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#: from werkzeug.routing import BaseConverter
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#:
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#: class ListConverter(BaseConverter):
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#: def to_python(self, value):
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#: return value.split(',')
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#: def to_url(self, values):
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#: return ','.join(super(ListConverter, self).to_url(value)
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#: for value in values)
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#:
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#: app = Flask(__name__)
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#: app.url_map.converters['list'] = ListConverter
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self.url_map = self.url_map_class(host_matching=host_matching)
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self.subdomain_matching = subdomain_matching
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# tracks internally if the application already handled at least one
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# request.
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self._got_first_request = False
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def _check_setup_finished(self, f_name: str) -> None:
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if self._got_first_request:
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raise AssertionError(
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f"The setup method '{f_name}' can no longer be called"
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" on the application. It has already handled its first"
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" request, any changes will not be applied"
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" consistently.\n"
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"Make sure all imports, decorators, functions, etc."
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" needed to set up the application are done before"
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" running it."
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)
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@cached_property
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def name(self) -> str:
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"""The name of the application. This is usually the import name
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with the difference that it's guessed from the run file if the
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import name is main. This name is used as a display name when
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Flask needs the name of the application. It can be set and overridden
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to change the value.
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.. versionadded:: 0.8
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"""
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if self.import_name == "__main__":
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fn: str | None = getattr(sys.modules["__main__"], "__file__", None)
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if fn is None:
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return "__main__"
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return os.path.splitext(os.path.basename(fn))[0]
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return self.import_name
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|
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@cached_property
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def logger(self) -> logging.Logger:
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"""A standard Python :class:`~logging.Logger` for the app, with
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the same name as :attr:`name`.
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In debug mode, the logger's :attr:`~logging.Logger.level` will
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be set to :data:`~logging.DEBUG`.
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If there are no handlers configured, a default handler will be
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added. See :doc:`/logging` for more information.
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.. versionchanged:: 1.1.0
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The logger takes the same name as :attr:`name` rather than
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hard-coding ``"flask.app"``.
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|
|
.. versionchanged:: 1.0.0
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Behavior was simplified. The logger is always named
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``"flask.app"``. The level is only set during configuration,
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it doesn't check ``app.debug`` each time. Only one format is
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used, not different ones depending on ``app.debug``. No
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handlers are removed, and a handler is only added if no
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handlers are already configured.
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.. versionadded:: 0.3
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"""
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return create_logger(self)
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@cached_property
|
|
def jinja_env(self) -> Environment:
|
|
"""The Jinja environment used to load templates.
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|
|
The environment is created the first time this property is
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accessed. Changing :attr:`jinja_options` after that will have no
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effect.
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"""
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return self.create_jinja_environment()
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|
|
def create_jinja_environment(self) -> Environment:
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raise NotImplementedError()
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|
|
def make_config(self, instance_relative: bool = False) -> Config:
|
|
"""Used to create the config attribute by the Flask constructor.
|
|
The `instance_relative` parameter is passed in from the constructor
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|
of Flask (there named `instance_relative_config`) and indicates if
|
|
the config should be relative to the instance path or the root path
|
|
of the application.
|
|
|
|
.. versionadded:: 0.8
|
|
"""
|
|
root_path = self.root_path
|
|
if instance_relative:
|
|
root_path = self.instance_path
|
|
defaults = dict(self.default_config)
|
|
defaults["DEBUG"] = get_debug_flag()
|
|
return self.config_class(root_path, defaults)
|
|
|
|
def make_aborter(self) -> Aborter:
|
|
"""Create the object to assign to :attr:`aborter`. That object
|
|
is called by :func:`flask.abort` to raise HTTP errors, and can
|
|
be called directly as well.
|
|
|
|
By default, this creates an instance of :attr:`aborter_class`,
|
|
which defaults to :class:`werkzeug.exceptions.Aborter`.
|
|
|
|
.. versionadded:: 2.2
|
|
"""
|
|
return self.aborter_class()
|
|
|
|
def auto_find_instance_path(self) -> str:
|
|
"""Tries to locate the instance path if it was not provided to the
|
|
constructor of the application class. It will basically calculate
|
|
the path to a folder named ``instance`` next to your main file or
|
|
the package.
|
|
|
|
.. versionadded:: 0.8
|
|
"""
|
|
prefix, package_path = find_package(self.import_name)
|
|
if prefix is None:
|
|
return os.path.join(package_path, "instance")
|
|
return os.path.join(prefix, "var", f"{self.name}-instance")
|
|
|
|
def create_global_jinja_loader(self) -> DispatchingJinjaLoader:
|
|
"""Creates the loader for the Jinja environment. Can be used to
|
|
override just the loader and keeping the rest unchanged. It's
|
|
discouraged to override this function. Instead one should override
|
|
the :meth:`jinja_loader` function instead.
|
|
|
|
The global loader dispatches between the loaders of the application
|
|
and the individual blueprints.
|
|
|
|
.. versionadded:: 0.7
|
|
"""
|
|
return DispatchingJinjaLoader(self)
|
|
|
|
def select_jinja_autoescape(self, filename: str) -> bool:
|
|
"""Returns ``True`` if autoescaping should be active for the given
|
|
template name. If no template name is given, returns `True`.
|
|
|
|
.. versionchanged:: 2.2
|
|
Autoescaping is now enabled by default for ``.svg`` files.
|
|
|
|
.. versionadded:: 0.5
|
|
"""
|
|
if filename is None:
|
|
return True
|
|
return filename.endswith((".html", ".htm", ".xml", ".xhtml", ".svg"))
|
|
|
|
@property
|
|
def debug(self) -> bool:
|
|
"""Whether debug mode is enabled. When using ``flask run`` to start the
|
|
development server, an interactive debugger will be shown for unhandled
|
|
exceptions, and the server will be reloaded when code changes. This maps to the
|
|
:data:`DEBUG` config key. It may not behave as expected if set late.
|
|
|
|
**Do not enable debug mode when deploying in production.**
|
|
|
|
Default: ``False``
|
|
"""
|
|
return self.config["DEBUG"] # type: ignore[no-any-return]
|
|
|
|
@debug.setter
|
|
def debug(self, value: bool) -> None:
|
|
self.config["DEBUG"] = value
|
|
|
|
if self.config["TEMPLATES_AUTO_RELOAD"] is None:
|
|
self.jinja_env.auto_reload = value
|
|
|
|
@setupmethod
|
|
def register_blueprint(self, blueprint: Blueprint, **options: t.Any) -> None:
|
|
"""Register a :class:`~flask.Blueprint` on the application. Keyword
|
|
arguments passed to this method will override the defaults set on the
|
|
blueprint.
|
|
|
|
Calls the blueprint's :meth:`~flask.Blueprint.register` method after
|
|
recording the blueprint in the application's :attr:`blueprints`.
|
|
|
|
:param blueprint: The blueprint to register.
|
|
:param url_prefix: Blueprint routes will be prefixed with this.
|
|
:param subdomain: Blueprint routes will match on this subdomain.
|
|
:param url_defaults: Blueprint routes will use these default values for
|
|
view arguments.
|
|
:param options: Additional keyword arguments are passed to
|
|
:class:`~flask.blueprints.BlueprintSetupState`. They can be
|
|
accessed in :meth:`~flask.Blueprint.record` callbacks.
|
|
|
|
.. versionchanged:: 2.0.1
|
|
The ``name`` option can be used to change the (pre-dotted)
|
|
name the blueprint is registered with. This allows the same
|
|
blueprint to be registered multiple times with unique names
|
|
for ``url_for``.
|
|
|
|
.. versionadded:: 0.7
|
|
"""
|
|
blueprint.register(self, options)
|
|
|
|
def iter_blueprints(self) -> t.ValuesView[Blueprint]:
|
|
"""Iterates over all blueprints by the order they were registered.
|
|
|
|
.. versionadded:: 0.11
|
|
"""
|
|
return self.blueprints.values()
|
|
|
|
@setupmethod
|
|
def add_url_rule(
|
|
self,
|
|
rule: str,
|
|
endpoint: str | None = None,
|
|
view_func: ft.RouteCallable | None = None,
|
|
provide_automatic_options: bool | None = None,
|
|
**options: t.Any,
|
|
) -> None:
|
|
if endpoint is None:
|
|
endpoint = _endpoint_from_view_func(view_func) # type: ignore
|
|
options["endpoint"] = endpoint
|
|
methods = options.pop("methods", None)
|
|
|
|
# if the methods are not given and the view_func object knows its
|
|
# methods we can use that instead. If neither exists, we go with
|
|
# a tuple of only ``GET`` as default.
|
|
if methods is None:
|
|
methods = getattr(view_func, "methods", None) or ("GET",)
|
|
if isinstance(methods, str):
|
|
raise TypeError(
|
|
"Allowed methods must be a list of strings, for"
|
|
' example: @app.route(..., methods=["POST"])'
|
|
)
|
|
methods = {item.upper() for item in methods}
|
|
|
|
# Methods that should always be added
|
|
required_methods: set[str] = set(getattr(view_func, "required_methods", ()))
|
|
|
|
# starting with Flask 0.8 the view_func object can disable and
|
|
# force-enable the automatic options handling.
|
|
if provide_automatic_options is None:
|
|
provide_automatic_options = getattr(
|
|
view_func, "provide_automatic_options", None
|
|
)
|
|
|
|
if provide_automatic_options is None:
|
|
if "OPTIONS" not in methods and self.config["PROVIDE_AUTOMATIC_OPTIONS"]:
|
|
provide_automatic_options = True
|
|
required_methods.add("OPTIONS")
|
|
else:
|
|
provide_automatic_options = False
|
|
|
|
# Add the required methods now.
|
|
methods |= required_methods
|
|
|
|
rule_obj = self.url_rule_class(rule, methods=methods, **options)
|
|
rule_obj.provide_automatic_options = provide_automatic_options # type: ignore[attr-defined]
|
|
|
|
self.url_map.add(rule_obj)
|
|
if view_func is not None:
|
|
old_func = self.view_functions.get(endpoint)
|
|
if old_func is not None and old_func != view_func:
|
|
raise AssertionError(
|
|
"View function mapping is overwriting an existing"
|
|
f" endpoint function: {endpoint}"
|
|
)
|
|
self.view_functions[endpoint] = view_func
|
|
|
|
@setupmethod
|
|
def template_filter(
|
|
self, name: str | None = None
|
|
) -> t.Callable[[T_template_filter], T_template_filter]:
|
|
"""A decorator that is used to register custom template filter.
|
|
You can specify a name for the filter, otherwise the function
|
|
name will be used. Example::
|
|
|
|
@app.template_filter()
|
|
def reverse(s):
|
|
return s[::-1]
|
|
|
|
:param name: the optional name of the filter, otherwise the
|
|
function name will be used.
|
|
"""
|
|
|
|
def decorator(f: T_template_filter) -> T_template_filter:
|
|
self.add_template_filter(f, name=name)
|
|
return f
|
|
|
|
return decorator
|
|
|
|
@setupmethod
|
|
def add_template_filter(
|
|
self, f: ft.TemplateFilterCallable, name: str | None = None
|
|
) -> None:
|
|
"""Register a custom template filter. Works exactly like the
|
|
:meth:`template_filter` decorator.
|
|
|
|
:param name: the optional name of the filter, otherwise the
|
|
function name will be used.
|
|
"""
|
|
self.jinja_env.filters[name or f.__name__] = f
|
|
|
|
@setupmethod
|
|
def template_test(
|
|
self, name: str | None = None
|
|
) -> t.Callable[[T_template_test], T_template_test]:
|
|
"""A decorator that is used to register custom template test.
|
|
You can specify a name for the test, otherwise the function
|
|
name will be used. Example::
|
|
|
|
@app.template_test()
|
|
def is_prime(n):
|
|
if n == 2:
|
|
return True
|
|
for i in range(2, int(math.ceil(math.sqrt(n))) + 1):
|
|
if n % i == 0:
|
|
return False
|
|
return True
|
|
|
|
.. versionadded:: 0.10
|
|
|
|
:param name: the optional name of the test, otherwise the
|
|
function name will be used.
|
|
"""
|
|
|
|
def decorator(f: T_template_test) -> T_template_test:
|
|
self.add_template_test(f, name=name)
|
|
return f
|
|
|
|
return decorator
|
|
|
|
@setupmethod
|
|
def add_template_test(
|
|
self, f: ft.TemplateTestCallable, name: str | None = None
|
|
) -> None:
|
|
"""Register a custom template test. Works exactly like the
|
|
:meth:`template_test` decorator.
|
|
|
|
.. versionadded:: 0.10
|
|
|
|
:param name: the optional name of the test, otherwise the
|
|
function name will be used.
|
|
"""
|
|
self.jinja_env.tests[name or f.__name__] = f
|
|
|
|
@setupmethod
|
|
def template_global(
|
|
self, name: str | None = None
|
|
) -> t.Callable[[T_template_global], T_template_global]:
|
|
"""A decorator that is used to register a custom template global function.
|
|
You can specify a name for the global function, otherwise the function
|
|
name will be used. Example::
|
|
|
|
@app.template_global()
|
|
def double(n):
|
|
return 2 * n
|
|
|
|
.. versionadded:: 0.10
|
|
|
|
:param name: the optional name of the global function, otherwise the
|
|
function name will be used.
|
|
"""
|
|
|
|
def decorator(f: T_template_global) -> T_template_global:
|
|
self.add_template_global(f, name=name)
|
|
return f
|
|
|
|
return decorator
|
|
|
|
@setupmethod
|
|
def add_template_global(
|
|
self, f: ft.TemplateGlobalCallable, name: str | None = None
|
|
) -> None:
|
|
"""Register a custom template global function. Works exactly like the
|
|
:meth:`template_global` decorator.
|
|
|
|
.. versionadded:: 0.10
|
|
|
|
:param name: the optional name of the global function, otherwise the
|
|
function name will be used.
|
|
"""
|
|
self.jinja_env.globals[name or f.__name__] = f
|
|
|
|
@setupmethod
|
|
def teardown_appcontext(self, f: T_teardown) -> T_teardown:
|
|
"""Registers a function to be called when the application
|
|
context is popped. The application context is typically popped
|
|
after the request context for each request, at the end of CLI
|
|
commands, or after a manually pushed context ends.
|
|
|
|
.. code-block:: python
|
|
|
|
with app.app_context():
|
|
...
|
|
|
|
When the ``with`` block exits (or ``ctx.pop()`` is called), the
|
|
teardown functions are called just before the app context is
|
|
made inactive. Since a request context typically also manages an
|
|
application context it would also be called when you pop a
|
|
request context.
|
|
|
|
When a teardown function was called because of an unhandled
|
|
exception it will be passed an error object. If an
|
|
:meth:`errorhandler` is registered, it will handle the exception
|
|
and the teardown will not receive it.
|
|
|
|
Teardown functions must avoid raising exceptions. If they
|
|
execute code that might fail they must surround that code with a
|
|
``try``/``except`` block and log any errors.
|
|
|
|
The return values of teardown functions are ignored.
|
|
|
|
.. versionadded:: 0.9
|
|
"""
|
|
self.teardown_appcontext_funcs.append(f)
|
|
return f
|
|
|
|
@setupmethod
|
|
def shell_context_processor(
|
|
self, f: T_shell_context_processor
|
|
) -> T_shell_context_processor:
|
|
"""Registers a shell context processor function.
|
|
|
|
.. versionadded:: 0.11
|
|
"""
|
|
self.shell_context_processors.append(f)
|
|
return f
|
|
|
|
def _find_error_handler(
|
|
self, e: Exception, blueprints: list[str]
|
|
) -> ft.ErrorHandlerCallable | None:
|
|
"""Return a registered error handler for an exception in this order:
|
|
blueprint handler for a specific code, app handler for a specific code,
|
|
blueprint handler for an exception class, app handler for an exception
|
|
class, or ``None`` if a suitable handler is not found.
|
|
"""
|
|
exc_class, code = self._get_exc_class_and_code(type(e))
|
|
names = (*blueprints, None)
|
|
|
|
for c in (code, None) if code is not None else (None,):
|
|
for name in names:
|
|
handler_map = self.error_handler_spec[name][c]
|
|
|
|
if not handler_map:
|
|
continue
|
|
|
|
for cls in exc_class.__mro__:
|
|
handler = handler_map.get(cls)
|
|
|
|
if handler is not None:
|
|
return handler
|
|
return None
|
|
|
|
def trap_http_exception(self, e: Exception) -> bool:
|
|
"""Checks if an HTTP exception should be trapped or not. By default
|
|
this will return ``False`` for all exceptions except for a bad request
|
|
key error if ``TRAP_BAD_REQUEST_ERRORS`` is set to ``True``. It
|
|
also returns ``True`` if ``TRAP_HTTP_EXCEPTIONS`` is set to ``True``.
|
|
|
|
This is called for all HTTP exceptions raised by a view function.
|
|
If it returns ``True`` for any exception the error handler for this
|
|
exception is not called and it shows up as regular exception in the
|
|
traceback. This is helpful for debugging implicitly raised HTTP
|
|
exceptions.
|
|
|
|
.. versionchanged:: 1.0
|
|
Bad request errors are not trapped by default in debug mode.
|
|
|
|
.. versionadded:: 0.8
|
|
"""
|
|
if self.config["TRAP_HTTP_EXCEPTIONS"]:
|
|
return True
|
|
|
|
trap_bad_request = self.config["TRAP_BAD_REQUEST_ERRORS"]
|
|
|
|
# if unset, trap key errors in debug mode
|
|
if (
|
|
trap_bad_request is None
|
|
and self.debug
|
|
and isinstance(e, BadRequestKeyError)
|
|
):
|
|
return True
|
|
|
|
if trap_bad_request:
|
|
return isinstance(e, BadRequest)
|
|
|
|
return False
|
|
|
|
def should_ignore_error(self, error: BaseException | None) -> bool:
|
|
"""This is called to figure out if an error should be ignored
|
|
or not as far as the teardown system is concerned. If this
|
|
function returns ``True`` then the teardown handlers will not be
|
|
passed the error.
|
|
|
|
.. versionadded:: 0.10
|
|
"""
|
|
return False
|
|
|
|
def redirect(self, location: str, code: int = 302) -> BaseResponse:
|
|
"""Create a redirect response object.
|
|
|
|
This is called by :func:`flask.redirect`, and can be called
|
|
directly as well.
|
|
|
|
:param location: The URL to redirect to.
|
|
:param code: The status code for the redirect.
|
|
|
|
.. versionadded:: 2.2
|
|
Moved from ``flask.redirect``, which calls this method.
|
|
"""
|
|
return _wz_redirect(
|
|
location,
|
|
code=code,
|
|
Response=self.response_class, # type: ignore[arg-type]
|
|
)
|
|
|
|
def inject_url_defaults(self, endpoint: str, values: dict[str, t.Any]) -> None:
|
|
"""Injects the URL defaults for the given endpoint directly into
|
|
the values dictionary passed. This is used internally and
|
|
automatically called on URL building.
|
|
|
|
.. versionadded:: 0.7
|
|
"""
|
|
names: t.Iterable[str | None] = (None,)
|
|
|
|
# url_for may be called outside a request context, parse the
|
|
# passed endpoint instead of using request.blueprints.
|
|
if "." in endpoint:
|
|
names = chain(
|
|
names, reversed(_split_blueprint_path(endpoint.rpartition(".")[0]))
|
|
)
|
|
|
|
for name in names:
|
|
if name in self.url_default_functions:
|
|
for func in self.url_default_functions[name]:
|
|
func(endpoint, values)
|
|
|
|
def handle_url_build_error(
|
|
self, error: BuildError, endpoint: str, values: dict[str, t.Any]
|
|
) -> str:
|
|
"""Called by :meth:`.url_for` if a
|
|
:exc:`~werkzeug.routing.BuildError` was raised. If this returns
|
|
a value, it will be returned by ``url_for``, otherwise the error
|
|
will be re-raised.
|
|
|
|
Each function in :attr:`url_build_error_handlers` is called with
|
|
``error``, ``endpoint`` and ``values``. If a function returns
|
|
``None`` or raises a ``BuildError``, it is skipped. Otherwise,
|
|
its return value is returned by ``url_for``.
|
|
|
|
:param error: The active ``BuildError`` being handled.
|
|
:param endpoint: The endpoint being built.
|
|
:param values: The keyword arguments passed to ``url_for``.
|
|
"""
|
|
for handler in self.url_build_error_handlers:
|
|
try:
|
|
rv = handler(error, endpoint, values)
|
|
except BuildError as e:
|
|
# make error available outside except block
|
|
error = e
|
|
else:
|
|
if rv is not None:
|
|
return rv
|
|
|
|
# Re-raise if called with an active exception, otherwise raise
|
|
# the passed in exception.
|
|
if error is sys.exc_info()[1]:
|
|
raise
|
|
|
|
raise error
|