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from __future__ import annotations
import os
import typing as t
from datetime import timedelta
from .cli import AppGroup
from .globals import current_app
from .helpers import send_from_directory
from .sansio.blueprints import Blueprint as SansioBlueprint
from .sansio.blueprints import BlueprintSetupState as BlueprintSetupState # noqa
from .sansio.scaffold import _sentinel
if t.TYPE_CHECKING: # pragma: no cover
from .wrappers import Response
class Blueprint(SansioBlueprint):
def __init__(
self,
name: str,
import_name: str,
static_folder: str | os.PathLike[str] | None = None,
static_url_path: str | None = None,
template_folder: str | os.PathLike[str] | None = None,
url_prefix: str | None = None,
subdomain: str | None = None,
url_defaults: dict[str, t.Any] | None = None,
root_path: str | None = None,
cli_group: str | None = _sentinel, # type: ignore
) -> None:
super().__init__(
name,
import_name,
static_folder,
static_url_path,
template_folder,
url_prefix,
subdomain,
url_defaults,
root_path,
cli_group,
)
#: The Click command group for registering CLI commands for this
#: object. The commands are available from the ``flask`` command
#: once the application has been discovered and blueprints have
#: been registered.
self.cli = AppGroup()
# Set the name of the Click group in case someone wants to add
# the app's commands to another CLI tool.
self.cli.name = self.name
def get_send_file_max_age(self, filename: str | None) -> int | None:
"""Used by :func:`send_file` to determine the ``max_age`` cache
value for a given file path if it wasn't passed.
By default, this returns :data:`SEND_FILE_MAX_AGE_DEFAULT` from
the configuration of :data:`~flask.current_app`. This defaults
to ``None``, which tells the browser to use conditional requests
instead of a timed cache, which is usually preferable.
Note this is a duplicate of the same method in the Flask
class.
.. versionchanged:: 2.0
The default configuration is ``None`` instead of 12 hours.
.. versionadded:: 0.9
"""
value = current_app.config["SEND_FILE_MAX_AGE_DEFAULT"]
if value is None:
return None
if isinstance(value, timedelta):
return int(value.total_seconds())
return value # type: ignore[no-any-return]
def send_static_file(self, filename: str) -> Response:
"""The view function used to serve files from
:attr:`static_folder`. A route is automatically registered for
this view at :attr:`static_url_path` if :attr:`static_folder` is
set.
Note this is a duplicate of the same method in the Flask
class.
.. versionadded:: 0.5
"""
if not self.has_static_folder:
raise RuntimeError("'static_folder' must be set to serve static_files.")
# send_file only knows to call get_send_file_max_age on the app,
# call it here so it works for blueprints too.
max_age = self.get_send_file_max_age(filename)
return send_from_directory(
t.cast(str, self.static_folder), filename, max_age=max_age
)
def open_resource(
self, resource: str, mode: str = "rb", encoding: str | None = "utf-8"
) -> t.IO[t.AnyStr]:
"""Open a resource file relative to :attr:`root_path` for reading. The
blueprint-relative equivalent of the app's :meth:`~.Flask.open_resource`
method.
:param resource: Path to the resource relative to :attr:`root_path`.
:param mode: Open the file in this mode. Only reading is supported,
valid values are ``"r"`` (or ``"rt"``) and ``"rb"``.
:param encoding: Open the file with this encoding when opening in text
mode. This is ignored when opening in binary mode.
.. versionchanged:: 3.1
Added the ``encoding`` parameter.
"""
if mode not in {"r", "rt", "rb"}:
raise ValueError("Resources can only be opened for reading.")
path = os.path.join(self.root_path, resource)
if mode == "rb":
return open(path, mode) # pyright: ignore
return open(path, mode, encoding=encoding)
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