622 lines
22 KiB
Python
622 lines
22 KiB
Python
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from __future__ import annotations
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import importlib.util
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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 datetime
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from functools import lru_cache
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from functools import update_wrapper
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import werkzeug.utils
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from werkzeug.exceptions import abort as _wz_abort
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from werkzeug.utils import redirect as _wz_redirect
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from werkzeug.wrappers import Response as BaseResponse
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from .globals import _cv_request
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from .globals import current_app
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from .globals import request
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from .globals import request_ctx
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from .globals import session
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from .signals import message_flashed
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if t.TYPE_CHECKING: # pragma: no cover
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from .wrappers import Response
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def get_debug_flag() -> bool:
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"""Get whether debug mode should be enabled for the app, indicated by the
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:envvar:`FLASK_DEBUG` environment variable. The default is ``False``.
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"""
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val = os.environ.get("FLASK_DEBUG")
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return bool(val and val.lower() not in {"0", "false", "no"})
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def get_load_dotenv(default: bool = True) -> bool:
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"""Get whether the user has disabled loading default dotenv files by
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setting :envvar:`FLASK_SKIP_DOTENV`. The default is ``True``, load
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the files.
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:param default: What to return if the env var isn't set.
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"""
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val = os.environ.get("FLASK_SKIP_DOTENV")
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if not val:
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return default
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return val.lower() in ("0", "false", "no")
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def stream_with_context(
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generator_or_function: t.Iterator[t.AnyStr] | t.Callable[..., t.Iterator[t.AnyStr]],
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) -> t.Iterator[t.AnyStr]:
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"""Request contexts disappear when the response is started on the server.
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This is done for efficiency reasons and to make it less likely to encounter
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memory leaks with badly written WSGI middlewares. The downside is that if
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you are using streamed responses, the generator cannot access request bound
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information any more.
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This function however can help you keep the context around for longer::
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from flask import stream_with_context, request, Response
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@app.route('/stream')
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def streamed_response():
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@stream_with_context
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def generate():
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yield 'Hello '
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yield request.args['name']
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yield '!'
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return Response(generate())
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Alternatively it can also be used around a specific generator::
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from flask import stream_with_context, request, Response
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@app.route('/stream')
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def streamed_response():
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def generate():
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yield 'Hello '
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yield request.args['name']
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yield '!'
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return Response(stream_with_context(generate()))
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.. versionadded:: 0.9
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"""
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try:
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gen = iter(generator_or_function) # type: ignore[arg-type]
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except TypeError:
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def decorator(*args: t.Any, **kwargs: t.Any) -> t.Any:
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gen = generator_or_function(*args, **kwargs) # type: ignore[operator]
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return stream_with_context(gen)
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return update_wrapper(decorator, generator_or_function) # type: ignore[arg-type]
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def generator() -> t.Iterator[t.AnyStr | None]:
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ctx = _cv_request.get(None)
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if ctx is None:
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raise RuntimeError(
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"'stream_with_context' can only be used when a request"
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" context is active, such as in a view function."
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)
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with ctx:
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# Dummy sentinel. Has to be inside the context block or we're
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# not actually keeping the context around.
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yield None
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# The try/finally is here so that if someone passes a WSGI level
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# iterator in we're still running the cleanup logic. Generators
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# don't need that because they are closed on their destruction
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# automatically.
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try:
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yield from gen
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finally:
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if hasattr(gen, "close"):
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gen.close()
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# The trick is to start the generator. Then the code execution runs until
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# the first dummy None is yielded at which point the context was already
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# pushed. This item is discarded. Then when the iteration continues the
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# real generator is executed.
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wrapped_g = generator()
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next(wrapped_g)
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return wrapped_g # type: ignore[return-value]
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def make_response(*args: t.Any) -> Response:
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"""Sometimes it is necessary to set additional headers in a view. Because
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views do not have to return response objects but can return a value that
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is converted into a response object by Flask itself, it becomes tricky to
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add headers to it. This function can be called instead of using a return
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and you will get a response object which you can use to attach headers.
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If view looked like this and you want to add a new header::
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def index():
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return render_template('index.html', foo=42)
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You can now do something like this::
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def index():
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response = make_response(render_template('index.html', foo=42))
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response.headers['X-Parachutes'] = 'parachutes are cool'
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return response
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This function accepts the very same arguments you can return from a
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view function. This for example creates a response with a 404 error
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code::
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response = make_response(render_template('not_found.html'), 404)
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The other use case of this function is to force the return value of a
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view function into a response which is helpful with view
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decorators::
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response = make_response(view_function())
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response.headers['X-Parachutes'] = 'parachutes are cool'
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Internally this function does the following things:
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- if no arguments are passed, it creates a new response argument
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- if one argument is passed, :meth:`flask.Flask.make_response`
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is invoked with it.
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- if more than one argument is passed, the arguments are passed
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to the :meth:`flask.Flask.make_response` function as tuple.
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.. versionadded:: 0.6
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"""
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if not args:
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return current_app.response_class()
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if len(args) == 1:
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args = args[0]
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return current_app.make_response(args)
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def url_for(
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endpoint: str,
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*,
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_anchor: str | None = None,
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_method: str | None = None,
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_scheme: str | None = None,
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_external: bool | None = None,
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**values: t.Any,
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) -> str:
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"""Generate a URL to the given endpoint with the given values.
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This requires an active request or application context, and calls
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:meth:`current_app.url_for() <flask.Flask.url_for>`. See that method
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for full documentation.
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:param endpoint: The endpoint name associated with the URL to
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generate. If this starts with a ``.``, the current blueprint
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name (if any) will be used.
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:param _anchor: If given, append this as ``#anchor`` to the URL.
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:param _method: If given, generate the URL associated with this
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method for the endpoint.
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:param _scheme: If given, the URL will have this scheme if it is
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external.
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:param _external: If given, prefer the URL to be internal (False) or
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require it to be external (True). External URLs include the
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scheme and domain. When not in an active request, URLs are
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external by default.
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:param values: Values to use for the variable parts of the URL rule.
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Unknown keys are appended as query string arguments, like
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``?a=b&c=d``.
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.. versionchanged:: 2.2
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Calls ``current_app.url_for``, allowing an app to override the
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behavior.
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.. versionchanged:: 0.10
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The ``_scheme`` parameter was added.
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.. versionchanged:: 0.9
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The ``_anchor`` and ``_method`` parameters were added.
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.. versionchanged:: 0.9
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Calls ``app.handle_url_build_error`` on build errors.
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"""
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return current_app.url_for(
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endpoint,
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_anchor=_anchor,
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_method=_method,
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_scheme=_scheme,
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_external=_external,
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**values,
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)
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def redirect(
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location: str, code: int = 302, Response: type[BaseResponse] | None = None
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) -> BaseResponse:
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"""Create a redirect response object.
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If :data:`~flask.current_app` is available, it will use its
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:meth:`~flask.Flask.redirect` method, otherwise it will use
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:func:`werkzeug.utils.redirect`.
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:param location: The URL to redirect to.
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:param code: The status code for the redirect.
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:param Response: The response class to use. Not used when
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``current_app`` is active, which uses ``app.response_class``.
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.. versionadded:: 2.2
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Calls ``current_app.redirect`` if available instead of always
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using Werkzeug's default ``redirect``.
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"""
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if current_app:
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return current_app.redirect(location, code=code)
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return _wz_redirect(location, code=code, Response=Response)
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def abort(code: int | BaseResponse, *args: t.Any, **kwargs: t.Any) -> t.NoReturn:
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"""Raise an :exc:`~werkzeug.exceptions.HTTPException` for the given
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status code.
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If :data:`~flask.current_app` is available, it will call its
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:attr:`~flask.Flask.aborter` object, otherwise it will use
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:func:`werkzeug.exceptions.abort`.
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:param code: The status code for the exception, which must be
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registered in ``app.aborter``.
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:param args: Passed to the exception.
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:param kwargs: Passed to the exception.
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.. versionadded:: 2.2
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Calls ``current_app.aborter`` if available instead of always
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using Werkzeug's default ``abort``.
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"""
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if current_app:
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current_app.aborter(code, *args, **kwargs)
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_wz_abort(code, *args, **kwargs)
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def get_template_attribute(template_name: str, attribute: str) -> t.Any:
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"""Loads a macro (or variable) a template exports. This can be used to
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invoke a macro from within Python code. If you for example have a
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template named :file:`_cider.html` with the following contents:
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.. sourcecode:: html+jinja
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{% macro hello(name) %}Hello {{ name }}!{% endmacro %}
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You can access this from Python code like this::
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hello = get_template_attribute('_cider.html', 'hello')
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return hello('World')
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.. versionadded:: 0.2
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:param template_name: the name of the template
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:param attribute: the name of the variable of macro to access
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"""
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return getattr(current_app.jinja_env.get_template(template_name).module, attribute)
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def flash(message: str, category: str = "message") -> None:
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"""Flashes a message to the next request. In order to remove the
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flashed message from the session and to display it to the user,
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the template has to call :func:`get_flashed_messages`.
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.. versionchanged:: 0.3
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`category` parameter added.
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:param message: the message to be flashed.
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:param category: the category for the message. The following values
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are recommended: ``'message'`` for any kind of message,
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``'error'`` for errors, ``'info'`` for information
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messages and ``'warning'`` for warnings. However any
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kind of string can be used as category.
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"""
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# Original implementation:
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#
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# session.setdefault('_flashes', []).append((category, message))
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#
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# This assumed that changes made to mutable structures in the session are
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# always in sync with the session object, which is not true for session
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# implementations that use external storage for keeping their keys/values.
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flashes = session.get("_flashes", [])
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flashes.append((category, message))
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session["_flashes"] = flashes
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app = current_app._get_current_object() # type: ignore
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message_flashed.send(
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app,
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_async_wrapper=app.ensure_sync,
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message=message,
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category=category,
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)
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def get_flashed_messages(
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with_categories: bool = False, category_filter: t.Iterable[str] = ()
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) -> list[str] | list[tuple[str, str]]:
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"""Pulls all flashed messages from the session and returns them.
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Further calls in the same request to the function will return
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the same messages. By default just the messages are returned,
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but when `with_categories` is set to ``True``, the return value will
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be a list of tuples in the form ``(category, message)`` instead.
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Filter the flashed messages to one or more categories by providing those
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categories in `category_filter`. This allows rendering categories in
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separate html blocks. The `with_categories` and `category_filter`
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arguments are distinct:
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* `with_categories` controls whether categories are returned with message
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text (``True`` gives a tuple, where ``False`` gives just the message text).
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* `category_filter` filters the messages down to only those matching the
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provided categories.
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See :doc:`/patterns/flashing` for examples.
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.. versionchanged:: 0.3
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`with_categories` parameter added.
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.. versionchanged:: 0.9
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`category_filter` parameter added.
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:param with_categories: set to ``True`` to also receive categories.
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:param category_filter: filter of categories to limit return values. Only
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categories in the list will be returned.
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"""
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flashes = request_ctx.flashes
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if flashes is None:
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flashes = session.pop("_flashes") if "_flashes" in session else []
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request_ctx.flashes = flashes
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if category_filter:
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flashes = list(filter(lambda f: f[0] in category_filter, flashes))
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if not with_categories:
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return [x[1] for x in flashes]
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return flashes
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def _prepare_send_file_kwargs(**kwargs: t.Any) -> dict[str, t.Any]:
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if kwargs.get("max_age") is None:
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|
|
kwargs["max_age"] = current_app.get_send_file_max_age
|
||
|
|
|
||
|
|
kwargs.update(
|
||
|
|
environ=request.environ,
|
||
|
|
use_x_sendfile=current_app.config["USE_X_SENDFILE"],
|
||
|
|
response_class=current_app.response_class,
|
||
|
|
_root_path=current_app.root_path, # type: ignore
|
||
|
|
)
|
||
|
|
return kwargs
|
||
|
|
|
||
|
|
|
||
|
|
def send_file(
|
||
|
|
path_or_file: os.PathLike[t.AnyStr] | str | t.BinaryIO,
|
||
|
|
mimetype: str | None = None,
|
||
|
|
as_attachment: bool = False,
|
||
|
|
download_name: str | None = None,
|
||
|
|
conditional: bool = True,
|
||
|
|
etag: bool | str = True,
|
||
|
|
last_modified: datetime | int | float | None = None,
|
||
|
|
max_age: None | (int | t.Callable[[str | None], int | None]) = None,
|
||
|
|
) -> Response:
|
||
|
|
"""Send the contents of a file to the client.
|
||
|
|
|
||
|
|
The first argument can be a file path or a file-like object. Paths
|
||
|
|
are preferred in most cases because Werkzeug can manage the file and
|
||
|
|
get extra information from the path. Passing a file-like object
|
||
|
|
requires that the file is opened in binary mode, and is mostly
|
||
|
|
useful when building a file in memory with :class:`io.BytesIO`.
|
||
|
|
|
||
|
|
Never pass file paths provided by a user. The path is assumed to be
|
||
|
|
trusted, so a user could craft a path to access a file you didn't
|
||
|
|
intend. Use :func:`send_from_directory` to safely serve
|
||
|
|
user-requested paths from within a directory.
|
||
|
|
|
||
|
|
If the WSGI server sets a ``file_wrapper`` in ``environ``, it is
|
||
|
|
used, otherwise Werkzeug's built-in wrapper is used. Alternatively,
|
||
|
|
if the HTTP server supports ``X-Sendfile``, configuring Flask with
|
||
|
|
``USE_X_SENDFILE = True`` will tell the server to send the given
|
||
|
|
path, which is much more efficient than reading it in Python.
|
||
|
|
|
||
|
|
:param path_or_file: The path to the file to send, relative to the
|
||
|
|
current working directory if a relative path is given.
|
||
|
|
Alternatively, a file-like object opened in binary mode. Make
|
||
|
|
sure the file pointer is seeked to the start of the data.
|
||
|
|
:param mimetype: The MIME type to send for the file. If not
|
||
|
|
provided, it will try to detect it from the file name.
|
||
|
|
:param as_attachment: Indicate to a browser that it should offer to
|
||
|
|
save the file instead of displaying it.
|
||
|
|
:param download_name: The default name browsers will use when saving
|
||
|
|
the file. Defaults to the passed file name.
|
||
|
|
:param conditional: Enable conditional and range responses based on
|
||
|
|
request headers. Requires passing a file path and ``environ``.
|
||
|
|
:param etag: Calculate an ETag for the file, which requires passing
|
||
|
|
a file path. Can also be a string to use instead.
|
||
|
|
:param last_modified: The last modified time to send for the file,
|
||
|
|
in seconds. If not provided, it will try to detect it from the
|
||
|
|
file path.
|
||
|
|
:param max_age: How long the client should cache the file, in
|
||
|
|
seconds. If set, ``Cache-Control`` will be ``public``, otherwise
|
||
|
|
it will be ``no-cache`` to prefer conditional caching.
|
||
|
|
|
||
|
|
.. versionchanged:: 2.0
|
||
|
|
``download_name`` replaces the ``attachment_filename``
|
||
|
|
parameter. If ``as_attachment=False``, it is passed with
|
||
|
|
``Content-Disposition: inline`` instead.
|
||
|
|
|
||
|
|
.. versionchanged:: 2.0
|
||
|
|
``max_age`` replaces the ``cache_timeout`` parameter.
|
||
|
|
``conditional`` is enabled and ``max_age`` is not set by
|
||
|
|
default.
|
||
|
|
|
||
|
|
.. versionchanged:: 2.0
|
||
|
|
``etag`` replaces the ``add_etags`` parameter. It can be a
|
||
|
|
string to use instead of generating one.
|
||
|
|
|
||
|
|
.. versionchanged:: 2.0
|
||
|
|
Passing a file-like object that inherits from
|
||
|
|
:class:`~io.TextIOBase` will raise a :exc:`ValueError` rather
|
||
|
|
than sending an empty file.
|
||
|
|
|
||
|
|
.. versionadded:: 2.0
|
||
|
|
Moved the implementation to Werkzeug. This is now a wrapper to
|
||
|
|
pass some Flask-specific arguments.
|
||
|
|
|
||
|
|
.. versionchanged:: 1.1
|
||
|
|
``filename`` may be a :class:`~os.PathLike` object.
|
||
|
|
|
||
|
|
.. versionchanged:: 1.1
|
||
|
|
Passing a :class:`~io.BytesIO` object supports range requests.
|
||
|
|
|
||
|
|
.. versionchanged:: 1.0.3
|
||
|
|
Filenames are encoded with ASCII instead of Latin-1 for broader
|
||
|
|
compatibility with WSGI servers.
|
||
|
|
|
||
|
|
.. versionchanged:: 1.0
|
||
|
|
UTF-8 filenames as specified in :rfc:`2231` are supported.
|
||
|
|
|
||
|
|
.. versionchanged:: 0.12
|
||
|
|
The filename is no longer automatically inferred from file
|
||
|
|
objects. If you want to use automatic MIME and etag support,
|
||
|
|
pass a filename via ``filename_or_fp`` or
|
||
|
|
``attachment_filename``.
|
||
|
|
|
||
|
|
.. versionchanged:: 0.12
|
||
|
|
``attachment_filename`` is preferred over ``filename`` for MIME
|
||
|
|
detection.
|
||
|
|
|
||
|
|
.. versionchanged:: 0.9
|
||
|
|
``cache_timeout`` defaults to
|
||
|
|
:meth:`Flask.get_send_file_max_age`.
|
||
|
|
|
||
|
|
.. versionchanged:: 0.7
|
||
|
|
MIME guessing and etag support for file-like objects was
|
||
|
|
removed because it was unreliable. Pass a filename if you are
|
||
|
|
able to, otherwise attach an etag yourself.
|
||
|
|
|
||
|
|
.. versionchanged:: 0.5
|
||
|
|
The ``add_etags``, ``cache_timeout`` and ``conditional``
|
||
|
|
parameters were added. The default behavior is to add etags.
|
||
|
|
|
||
|
|
.. versionadded:: 0.2
|
||
|
|
"""
|
||
|
|
return werkzeug.utils.send_file( # type: ignore[return-value]
|
||
|
|
**_prepare_send_file_kwargs(
|
||
|
|
path_or_file=path_or_file,
|
||
|
|
environ=request.environ,
|
||
|
|
mimetype=mimetype,
|
||
|
|
as_attachment=as_attachment,
|
||
|
|
download_name=download_name,
|
||
|
|
conditional=conditional,
|
||
|
|
etag=etag,
|
||
|
|
last_modified=last_modified,
|
||
|
|
max_age=max_age,
|
||
|
|
)
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def send_from_directory(
|
||
|
|
directory: os.PathLike[str] | str,
|
||
|
|
path: os.PathLike[str] | str,
|
||
|
|
**kwargs: t.Any,
|
||
|
|
) -> Response:
|
||
|
|
"""Send a file from within a directory using :func:`send_file`.
|
||
|
|
|
||
|
|
.. code-block:: python
|
||
|
|
|
||
|
|
@app.route("/uploads/<path:name>")
|
||
|
|
def download_file(name):
|
||
|
|
return send_from_directory(
|
||
|
|
app.config['UPLOAD_FOLDER'], name, as_attachment=True
|
||
|
|
)
|
||
|
|
|
||
|
|
This is a secure way to serve files from a folder, such as static
|
||
|
|
files or uploads. Uses :func:`~werkzeug.security.safe_join` to
|
||
|
|
ensure the path coming from the client is not maliciously crafted to
|
||
|
|
point outside the specified directory.
|
||
|
|
|
||
|
|
If the final path does not point to an existing regular file,
|
||
|
|
raises a 404 :exc:`~werkzeug.exceptions.NotFound` error.
|
||
|
|
|
||
|
|
:param directory: The directory that ``path`` must be located under,
|
||
|
|
relative to the current application's root path.
|
||
|
|
:param path: The path to the file to send, relative to
|
||
|
|
``directory``.
|
||
|
|
:param kwargs: Arguments to pass to :func:`send_file`.
|
||
|
|
|
||
|
|
.. versionchanged:: 2.0
|
||
|
|
``path`` replaces the ``filename`` parameter.
|
||
|
|
|
||
|
|
.. versionadded:: 2.0
|
||
|
|
Moved the implementation to Werkzeug. This is now a wrapper to
|
||
|
|
pass some Flask-specific arguments.
|
||
|
|
|
||
|
|
.. versionadded:: 0.5
|
||
|
|
"""
|
||
|
|
return werkzeug.utils.send_from_directory( # type: ignore[return-value]
|
||
|
|
directory, path, **_prepare_send_file_kwargs(**kwargs)
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def get_root_path(import_name: str) -> str:
|
||
|
|
"""Find the root path of a package, or the path that contains a
|
||
|
|
module. If it cannot be found, returns the current working
|
||
|
|
directory.
|
||
|
|
|
||
|
|
Not to be confused with the value returned by :func:`find_package`.
|
||
|
|
|
||
|
|
:meta private:
|
||
|
|
"""
|
||
|
|
# Module already imported and has a file attribute. Use that first.
|
||
|
|
mod = sys.modules.get(import_name)
|
||
|
|
|
||
|
|
if mod is not None and hasattr(mod, "__file__") and mod.__file__ is not None:
|
||
|
|
return os.path.dirname(os.path.abspath(mod.__file__))
|
||
|
|
|
||
|
|
# Next attempt: check the loader.
|
||
|
|
try:
|
||
|
|
spec = importlib.util.find_spec(import_name)
|
||
|
|
|
||
|
|
if spec is None:
|
||
|
|
raise ValueError
|
||
|
|
except (ImportError, ValueError):
|
||
|
|
loader = None
|
||
|
|
else:
|
||
|
|
loader = spec.loader
|
||
|
|
|
||
|
|
# Loader does not exist or we're referring to an unloaded main
|
||
|
|
# module or a main module without path (interactive sessions), go
|
||
|
|
# with the current working directory.
|
||
|
|
if loader is None:
|
||
|
|
return os.getcwd()
|
||
|
|
|
||
|
|
if hasattr(loader, "get_filename"):
|
||
|
|
filepath = loader.get_filename(import_name)
|
||
|
|
else:
|
||
|
|
# Fall back to imports.
|
||
|
|
__import__(import_name)
|
||
|
|
mod = sys.modules[import_name]
|
||
|
|
filepath = getattr(mod, "__file__", None)
|
||
|
|
|
||
|
|
# If we don't have a file path it might be because it is a
|
||
|
|
# namespace package. In this case pick the root path from the
|
||
|
|
# first module that is contained in the package.
|
||
|
|
if filepath is None:
|
||
|
|
raise RuntimeError(
|
||
|
|
"No root path can be found for the provided module"
|
||
|
|
f" {import_name!r}. This can happen because the module"
|
||
|
|
" came from an import hook that does not provide file"
|
||
|
|
" name information or because it's a namespace package."
|
||
|
|
" In this case the root path needs to be explicitly"
|
||
|
|
" provided."
|
||
|
|
)
|
||
|
|
|
||
|
|
# filepath is import_name.py for a module, or __init__.py for a package.
|
||
|
|
return os.path.dirname(os.path.abspath(filepath)) # type: ignore[no-any-return]
|
||
|
|
|
||
|
|
|
||
|
|
@lru_cache(maxsize=None)
|
||
|
|
def _split_blueprint_path(name: str) -> list[str]:
|
||
|
|
out: list[str] = [name]
|
||
|
|
|
||
|
|
if "." in name:
|
||
|
|
out.extend(_split_blueprint_path(name.rpartition(".")[0]))
|
||
|
|
|
||
|
|
return out
|