604 lines
23 KiB
Python
604 lines
23 KiB
Python
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import typing as t
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from collections import defaultdict
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from functools import update_wrapper
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from .scaffold import _endpoint_from_view_func
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from .scaffold import _sentinel
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from .scaffold import Scaffold
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from .typing import AfterRequestCallable
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from .typing import BeforeRequestCallable
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from .typing import ErrorHandlerCallable
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from .typing import TeardownCallable
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from .typing import TemplateContextProcessorCallable
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from .typing import TemplateFilterCallable
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from .typing import TemplateGlobalCallable
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from .typing import TemplateTestCallable
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from .typing import URLDefaultCallable
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from .typing import URLValuePreprocessorCallable
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if t.TYPE_CHECKING:
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from .app import Flask
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DeferredSetupFunction = t.Callable[["BlueprintSetupState"], t.Callable]
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class BlueprintSetupState:
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"""Temporary holder object for registering a blueprint with the
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application. An instance of this class is created by the
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:meth:`~flask.Blueprint.make_setup_state` method and later passed
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to all register callback functions.
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"""
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def __init__(
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self,
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blueprint: "Blueprint",
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app: "Flask",
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options: t.Any,
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first_registration: bool,
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) -> None:
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#: a reference to the current application
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self.app = app
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#: a reference to the blueprint that created this setup state.
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self.blueprint = blueprint
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#: a dictionary with all options that were passed to the
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#: :meth:`~flask.Flask.register_blueprint` method.
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self.options = options
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#: as blueprints can be registered multiple times with the
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#: application and not everything wants to be registered
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#: multiple times on it, this attribute can be used to figure
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#: out if the blueprint was registered in the past already.
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self.first_registration = first_registration
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subdomain = self.options.get("subdomain")
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if subdomain is None:
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subdomain = self.blueprint.subdomain
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#: The subdomain that the blueprint should be active for, ``None``
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#: otherwise.
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self.subdomain = subdomain
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url_prefix = self.options.get("url_prefix")
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if url_prefix is None:
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url_prefix = self.blueprint.url_prefix
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#: The prefix that should be used for all URLs defined on the
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#: blueprint.
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self.url_prefix = url_prefix
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self.name = self.options.get("name", blueprint.name)
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self.name_prefix = self.options.get("name_prefix", "")
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#: A dictionary with URL defaults that is added to each and every
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#: URL that was defined with the blueprint.
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self.url_defaults = dict(self.blueprint.url_values_defaults)
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self.url_defaults.update(self.options.get("url_defaults", ()))
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def add_url_rule(
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self,
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rule: str,
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endpoint: t.Optional[str] = None,
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view_func: t.Optional[t.Callable] = None,
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**options: t.Any,
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) -> None:
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"""A helper method to register a rule (and optionally a view function)
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to the application. The endpoint is automatically prefixed with the
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blueprint's name.
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"""
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if self.url_prefix is not None:
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if rule:
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rule = "/".join((self.url_prefix.rstrip("/"), rule.lstrip("/")))
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else:
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rule = self.url_prefix
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options.setdefault("subdomain", self.subdomain)
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if endpoint is None:
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endpoint = _endpoint_from_view_func(view_func) # type: ignore
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defaults = self.url_defaults
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if "defaults" in options:
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defaults = dict(defaults, **options.pop("defaults"))
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self.app.add_url_rule(
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rule,
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f"{self.name_prefix}.{self.name}.{endpoint}".lstrip("."),
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view_func,
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defaults=defaults,
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**options,
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)
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class Blueprint(Scaffold):
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"""Represents a blueprint, a collection of routes and other
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app-related functions that can be registered on a real application
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later.
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A blueprint is an object that allows defining application functions
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without requiring an application object ahead of time. It uses the
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same decorators as :class:`~flask.Flask`, but defers the need for an
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application by recording them for later registration.
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Decorating a function with a blueprint creates a deferred function
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that is called with :class:`~flask.blueprints.BlueprintSetupState`
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when the blueprint is registered on an application.
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See :doc:`/blueprints` for more information.
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:param name: The name of the blueprint. Will be prepended to each
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endpoint name.
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:param import_name: The name of the blueprint package, usually
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``__name__``. This helps locate the ``root_path`` for the
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blueprint.
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:param static_folder: A folder with static files that should be
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served by the blueprint's static route. The path is relative to
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the blueprint's root path. Blueprint static files are disabled
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by default.
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:param static_url_path: The url to serve static files from.
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Defaults to ``static_folder``. If the blueprint does not have
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a ``url_prefix``, the app's static route will take precedence,
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and the blueprint's static files won't be accessible.
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:param template_folder: A folder with templates that should be added
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to the app's template search path. The path is relative to the
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blueprint's root path. Blueprint templates are disabled by
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default. Blueprint templates have a lower precedence than those
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in the app's templates folder.
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:param url_prefix: A path to prepend to all of the blueprint's URLs,
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to make them distinct from the rest of the app's routes.
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:param subdomain: A subdomain that blueprint routes will match on by
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default.
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:param url_defaults: A dict of default values that blueprint routes
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will receive by default.
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:param root_path: By default, the blueprint will automatically set
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this based on ``import_name``. In certain situations this
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automatic detection can fail, so the path can be specified
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manually instead.
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.. versionchanged:: 1.1.0
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Blueprints have a ``cli`` group to register nested CLI commands.
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The ``cli_group`` parameter controls the name of the group under
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the ``flask`` command.
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.. versionadded:: 0.7
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"""
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warn_on_modifications = False
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_got_registered_once = False
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#: Blueprint local JSON encoder class to use. Set to ``None`` to use
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#: the app's :class:`~flask.Flask.json_encoder`.
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json_encoder = None
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#: Blueprint local JSON decoder class to use. Set to ``None`` to use
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#: the app's :class:`~flask.Flask.json_decoder`.
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json_decoder = None
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def __init__(
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self,
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name: str,
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import_name: str,
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static_folder: t.Optional[str] = None,
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static_url_path: t.Optional[str] = None,
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template_folder: t.Optional[str] = None,
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url_prefix: t.Optional[str] = None,
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subdomain: t.Optional[str] = None,
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url_defaults: t.Optional[dict] = None,
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root_path: t.Optional[str] = None,
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cli_group: t.Optional[str] = _sentinel, # type: ignore
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):
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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 "." in name:
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raise ValueError("'name' may not contain a dot '.' character.")
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self.name = name
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self.url_prefix = url_prefix
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self.subdomain = subdomain
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self.deferred_functions: t.List[DeferredSetupFunction] = []
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if url_defaults is None:
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url_defaults = {}
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self.url_values_defaults = url_defaults
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self.cli_group = cli_group
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self._blueprints: t.List[t.Tuple["Blueprint", dict]] = []
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def _is_setup_finished(self) -> bool:
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return self.warn_on_modifications and self._got_registered_once
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def record(self, func: t.Callable) -> None:
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"""Registers a function that is called when the blueprint is
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registered on the application. This function is called with the
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state as argument as returned by the :meth:`make_setup_state`
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method.
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"""
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if self._got_registered_once and self.warn_on_modifications:
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from warnings import warn
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warn(
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Warning(
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"The blueprint was already registered once but is"
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" getting modified now. These changes will not show"
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" up."
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)
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)
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self.deferred_functions.append(func)
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def record_once(self, func: t.Callable) -> None:
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"""Works like :meth:`record` but wraps the function in another
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function that will ensure the function is only called once. If the
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blueprint is registered a second time on the application, the
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function passed is not called.
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"""
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def wrapper(state: BlueprintSetupState) -> None:
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if state.first_registration:
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func(state)
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return self.record(update_wrapper(wrapper, func))
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def make_setup_state(
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self, app: "Flask", options: dict, first_registration: bool = False
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) -> BlueprintSetupState:
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"""Creates an instance of :meth:`~flask.blueprints.BlueprintSetupState`
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object that is later passed to the register callback functions.
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Subclasses can override this to return a subclass of the setup state.
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"""
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return BlueprintSetupState(self, app, options, first_registration)
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def register_blueprint(self, blueprint: "Blueprint", **options: t.Any) -> None:
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"""Register a :class:`~flask.Blueprint` on this blueprint. Keyword
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arguments passed to this method will override the defaults set
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on the blueprint.
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.. versionchanged:: 2.0.1
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The ``name`` option can be used to change the (pre-dotted)
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name the blueprint is registered with. This allows the same
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blueprint to be registered multiple times with unique names
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for ``url_for``.
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.. versionadded:: 2.0
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"""
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if blueprint is self:
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raise ValueError("Cannot register a blueprint on itself")
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self._blueprints.append((blueprint, options))
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def register(self, app: "Flask", options: dict) -> None:
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"""Called by :meth:`Flask.register_blueprint` to register all
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views and callbacks registered on the blueprint with the
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application. Creates a :class:`.BlueprintSetupState` and calls
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each :meth:`record` callback with it.
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:param app: The application this blueprint is being registered
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with.
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:param options: Keyword arguments forwarded from
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:meth:`~Flask.register_blueprint`.
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.. versionchanged:: 2.0.1
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Nested blueprints are registered with their dotted name.
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This allows different blueprints with the same name to be
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nested at different locations.
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.. versionchanged:: 2.0.1
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The ``name`` option can be used to change the (pre-dotted)
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name the blueprint is registered with. This allows the same
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blueprint to be registered multiple times with unique names
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for ``url_for``.
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.. versionchanged:: 2.0.1
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Registering the same blueprint with the same name multiple
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times is deprecated and will become an error in Flask 2.1.
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"""
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first_registration = not any(bp is self for bp in app.blueprints.values())
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name_prefix = options.get("name_prefix", "")
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self_name = options.get("name", self.name)
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name = f"{name_prefix}.{self_name}".lstrip(".")
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if name in app.blueprints:
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existing_at = f" '{name}'" if self_name != name else ""
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if app.blueprints[name] is not self:
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raise ValueError(
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f"The name '{self_name}' is already registered for"
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f" a different blueprint{existing_at}. Use 'name='"
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" to provide a unique name."
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)
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else:
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import warnings
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warnings.warn(
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f"The name '{self_name}' is already registered for"
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f" this blueprint{existing_at}. Use 'name=' to"
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" provide a unique name. This will become an error"
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" in Flask 2.1.",
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stacklevel=4,
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)
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app.blueprints[name] = self
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self._got_registered_once = True
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state = self.make_setup_state(app, options, first_registration)
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if self.has_static_folder:
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state.add_url_rule(
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f"{self.static_url_path}/<path:filename>",
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view_func=self.send_static_file,
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endpoint="static",
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)
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# Merge blueprint data into parent.
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if first_registration:
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def extend(bp_dict, parent_dict):
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for key, values in bp_dict.items():
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key = name if key is None else f"{name}.{key}"
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parent_dict[key].extend(values)
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for key, value in self.error_handler_spec.items():
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key = name if key is None else f"{name}.{key}"
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value = defaultdict(
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dict,
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{
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code: {
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exc_class: func for exc_class, func in code_values.items()
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}
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for code, code_values in value.items()
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},
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)
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app.error_handler_spec[key] = value
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for endpoint, func in self.view_functions.items():
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app.view_functions[endpoint] = func
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extend(self.before_request_funcs, app.before_request_funcs)
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extend(self.after_request_funcs, app.after_request_funcs)
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extend(
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self.teardown_request_funcs,
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app.teardown_request_funcs,
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)
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extend(self.url_default_functions, app.url_default_functions)
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extend(self.url_value_preprocessors, app.url_value_preprocessors)
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extend(self.template_context_processors, app.template_context_processors)
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for deferred in self.deferred_functions:
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deferred(state)
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cli_resolved_group = options.get("cli_group", self.cli_group)
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|
|
if self.cli.commands:
|
||
|
|
if cli_resolved_group is None:
|
||
|
|
app.cli.commands.update(self.cli.commands)
|
||
|
|
elif cli_resolved_group is _sentinel:
|
||
|
|
self.cli.name = name
|
||
|
|
app.cli.add_command(self.cli)
|
||
|
|
else:
|
||
|
|
self.cli.name = cli_resolved_group
|
||
|
|
app.cli.add_command(self.cli)
|
||
|
|
|
||
|
|
for blueprint, bp_options in self._blueprints:
|
||
|
|
bp_options = bp_options.copy()
|
||
|
|
bp_url_prefix = bp_options.get("url_prefix")
|
||
|
|
|
||
|
|
if bp_url_prefix is None:
|
||
|
|
bp_url_prefix = blueprint.url_prefix
|
||
|
|
|
||
|
|
if state.url_prefix is not None and bp_url_prefix is not None:
|
||
|
|
bp_options["url_prefix"] = (
|
||
|
|
state.url_prefix.rstrip("/") + "/" + bp_url_prefix.lstrip("/")
|
||
|
|
)
|
||
|
|
elif bp_url_prefix is not None:
|
||
|
|
bp_options["url_prefix"] = bp_url_prefix
|
||
|
|
elif state.url_prefix is not None:
|
||
|
|
bp_options["url_prefix"] = state.url_prefix
|
||
|
|
|
||
|
|
bp_options["name_prefix"] = name
|
||
|
|
blueprint.register(app, bp_options)
|
||
|
|
|
||
|
|
def add_url_rule(
|
||
|
|
self,
|
||
|
|
rule: str,
|
||
|
|
endpoint: t.Optional[str] = None,
|
||
|
|
view_func: t.Optional[t.Callable] = None,
|
||
|
|
provide_automatic_options: t.Optional[bool] = None,
|
||
|
|
**options: t.Any,
|
||
|
|
) -> None:
|
||
|
|
"""Like :meth:`Flask.add_url_rule` but for a blueprint. The endpoint for
|
||
|
|
the :func:`url_for` function is prefixed with the name of the blueprint.
|
||
|
|
"""
|
||
|
|
if endpoint and "." in endpoint:
|
||
|
|
raise ValueError("'endpoint' may not contain a dot '.' character.")
|
||
|
|
|
||
|
|
if view_func and hasattr(view_func, "__name__") and "." in view_func.__name__:
|
||
|
|
raise ValueError("'view_func' name may not contain a dot '.' character.")
|
||
|
|
|
||
|
|
self.record(
|
||
|
|
lambda s: s.add_url_rule(
|
||
|
|
rule,
|
||
|
|
endpoint,
|
||
|
|
view_func,
|
||
|
|
provide_automatic_options=provide_automatic_options,
|
||
|
|
**options,
|
||
|
|
)
|
||
|
|
)
|
||
|
|
|
||
|
|
def app_template_filter(
|
||
|
|
self, name: t.Optional[str] = None
|
||
|
|
) -> t.Callable[[TemplateFilterCallable], TemplateFilterCallable]:
|
||
|
|
"""Register a custom template filter, available application wide. Like
|
||
|
|
:meth:`Flask.template_filter` but for a blueprint.
|
||
|
|
|
||
|
|
:param name: the optional name of the filter, otherwise the
|
||
|
|
function name will be used.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def decorator(f: TemplateFilterCallable) -> TemplateFilterCallable:
|
||
|
|
self.add_app_template_filter(f, name=name)
|
||
|
|
return f
|
||
|
|
|
||
|
|
return decorator
|
||
|
|
|
||
|
|
def add_app_template_filter(
|
||
|
|
self, f: TemplateFilterCallable, name: t.Optional[str] = None
|
||
|
|
) -> None:
|
||
|
|
"""Register a custom template filter, available application wide. Like
|
||
|
|
:meth:`Flask.add_template_filter` but for a blueprint. Works exactly
|
||
|
|
like the :meth:`app_template_filter` decorator.
|
||
|
|
|
||
|
|
:param name: the optional name of the filter, otherwise the
|
||
|
|
function name will be used.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def register_template(state: BlueprintSetupState) -> None:
|
||
|
|
state.app.jinja_env.filters[name or f.__name__] = f
|
||
|
|
|
||
|
|
self.record_once(register_template)
|
||
|
|
|
||
|
|
def app_template_test(
|
||
|
|
self, name: t.Optional[str] = None
|
||
|
|
) -> t.Callable[[TemplateTestCallable], TemplateTestCallable]:
|
||
|
|
"""Register a custom template test, available application wide. Like
|
||
|
|
:meth:`Flask.template_test` but for a blueprint.
|
||
|
|
|
||
|
|
.. versionadded:: 0.10
|
||
|
|
|
||
|
|
:param name: the optional name of the test, otherwise the
|
||
|
|
function name will be used.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def decorator(f: TemplateTestCallable) -> TemplateTestCallable:
|
||
|
|
self.add_app_template_test(f, name=name)
|
||
|
|
return f
|
||
|
|
|
||
|
|
return decorator
|
||
|
|
|
||
|
|
def add_app_template_test(
|
||
|
|
self, f: TemplateTestCallable, name: t.Optional[str] = None
|
||
|
|
) -> None:
|
||
|
|
"""Register a custom template test, available application wide. Like
|
||
|
|
:meth:`Flask.add_template_test` but for a blueprint. Works exactly
|
||
|
|
like the :meth:`app_template_test` decorator.
|
||
|
|
|
||
|
|
.. versionadded:: 0.10
|
||
|
|
|
||
|
|
:param name: the optional name of the test, otherwise the
|
||
|
|
function name will be used.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def register_template(state: BlueprintSetupState) -> None:
|
||
|
|
state.app.jinja_env.tests[name or f.__name__] = f
|
||
|
|
|
||
|
|
self.record_once(register_template)
|
||
|
|
|
||
|
|
def app_template_global(
|
||
|
|
self, name: t.Optional[str] = None
|
||
|
|
) -> t.Callable[[TemplateGlobalCallable], TemplateGlobalCallable]:
|
||
|
|
"""Register a custom template global, available application wide. Like
|
||
|
|
:meth:`Flask.template_global` but for a blueprint.
|
||
|
|
|
||
|
|
.. versionadded:: 0.10
|
||
|
|
|
||
|
|
:param name: the optional name of the global, otherwise the
|
||
|
|
function name will be used.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def decorator(f: TemplateGlobalCallable) -> TemplateGlobalCallable:
|
||
|
|
self.add_app_template_global(f, name=name)
|
||
|
|
return f
|
||
|
|
|
||
|
|
return decorator
|
||
|
|
|
||
|
|
def add_app_template_global(
|
||
|
|
self, f: TemplateGlobalCallable, name: t.Optional[str] = None
|
||
|
|
) -> None:
|
||
|
|
"""Register a custom template global, available application wide. Like
|
||
|
|
:meth:`Flask.add_template_global` but for a blueprint. Works exactly
|
||
|
|
like the :meth:`app_template_global` decorator.
|
||
|
|
|
||
|
|
.. versionadded:: 0.10
|
||
|
|
|
||
|
|
:param name: the optional name of the global, otherwise the
|
||
|
|
function name will be used.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def register_template(state: BlueprintSetupState) -> None:
|
||
|
|
state.app.jinja_env.globals[name or f.__name__] = f
|
||
|
|
|
||
|
|
self.record_once(register_template)
|
||
|
|
|
||
|
|
def before_app_request(self, f: BeforeRequestCallable) -> BeforeRequestCallable:
|
||
|
|
"""Like :meth:`Flask.before_request`. Such a function is executed
|
||
|
|
before each request, even if outside of a blueprint.
|
||
|
|
"""
|
||
|
|
self.record_once(
|
||
|
|
lambda s: s.app.before_request_funcs.setdefault(None, []).append(f)
|
||
|
|
)
|
||
|
|
return f
|
||
|
|
|
||
|
|
def before_app_first_request(
|
||
|
|
self, f: BeforeRequestCallable
|
||
|
|
) -> BeforeRequestCallable:
|
||
|
|
"""Like :meth:`Flask.before_first_request`. Such a function is
|
||
|
|
executed before the first request to the application.
|
||
|
|
"""
|
||
|
|
self.record_once(lambda s: s.app.before_first_request_funcs.append(f))
|
||
|
|
return f
|
||
|
|
|
||
|
|
def after_app_request(self, f: AfterRequestCallable) -> AfterRequestCallable:
|
||
|
|
"""Like :meth:`Flask.after_request` but for a blueprint. Such a function
|
||
|
|
is executed after each request, even if outside of the blueprint.
|
||
|
|
"""
|
||
|
|
self.record_once(
|
||
|
|
lambda s: s.app.after_request_funcs.setdefault(None, []).append(f)
|
||
|
|
)
|
||
|
|
return f
|
||
|
|
|
||
|
|
def teardown_app_request(self, f: TeardownCallable) -> TeardownCallable:
|
||
|
|
"""Like :meth:`Flask.teardown_request` but for a blueprint. Such a
|
||
|
|
function is executed when tearing down each request, even if outside of
|
||
|
|
the blueprint.
|
||
|
|
"""
|
||
|
|
self.record_once(
|
||
|
|
lambda s: s.app.teardown_request_funcs.setdefault(None, []).append(f)
|
||
|
|
)
|
||
|
|
return f
|
||
|
|
|
||
|
|
def app_context_processor(
|
||
|
|
self, f: TemplateContextProcessorCallable
|
||
|
|
) -> TemplateContextProcessorCallable:
|
||
|
|
"""Like :meth:`Flask.context_processor` but for a blueprint. Such a
|
||
|
|
function is executed each request, even if outside of the blueprint.
|
||
|
|
"""
|
||
|
|
self.record_once(
|
||
|
|
lambda s: s.app.template_context_processors.setdefault(None, []).append(f)
|
||
|
|
)
|
||
|
|
return f
|
||
|
|
|
||
|
|
def app_errorhandler(self, code: t.Union[t.Type[Exception], int]) -> t.Callable:
|
||
|
|
"""Like :meth:`Flask.errorhandler` but for a blueprint. This
|
||
|
|
handler is used for all requests, even if outside of the blueprint.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def decorator(f: ErrorHandlerCallable) -> ErrorHandlerCallable:
|
||
|
|
self.record_once(lambda s: s.app.errorhandler(code)(f))
|
||
|
|
return f
|
||
|
|
|
||
|
|
return decorator
|
||
|
|
|
||
|
|
def app_url_value_preprocessor(
|
||
|
|
self, f: URLValuePreprocessorCallable
|
||
|
|
) -> URLValuePreprocessorCallable:
|
||
|
|
"""Same as :meth:`url_value_preprocessor` but application wide."""
|
||
|
|
self.record_once(
|
||
|
|
lambda s: s.app.url_value_preprocessors.setdefault(None, []).append(f)
|
||
|
|
)
|
||
|
|
return f
|
||
|
|
|
||
|
|
def app_url_defaults(self, f: URLDefaultCallable) -> URLDefaultCallable:
|
||
|
|
"""Same as :meth:`url_defaults` but application wide."""
|
||
|
|
self.record_once(
|
||
|
|
lambda s: s.app.url_default_functions.setdefault(None, []).append(f)
|
||
|
|
)
|
||
|
|
return f
|