mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-10 01:17:42 +01:00
121 lines
4.1 KiB
Python
121 lines
4.1 KiB
Python
import re
|
|
from typing import TYPE_CHECKING, Awaitable, Callable, Tuple, Type, TypeVar
|
|
|
|
from .web_exceptions import HTTPPermanentRedirect, _HTTPMove
|
|
from .web_request import Request
|
|
from .web_response import StreamResponse
|
|
from .web_urldispatcher import SystemRoute
|
|
|
|
__all__ = (
|
|
"middleware",
|
|
"normalize_path_middleware",
|
|
)
|
|
|
|
if TYPE_CHECKING: # pragma: no cover
|
|
from .web_app import Application
|
|
|
|
_Func = TypeVar("_Func")
|
|
|
|
|
|
async def _check_request_resolves(request: Request, path: str) -> Tuple[bool, Request]:
|
|
alt_request = request.clone(rel_url=path)
|
|
|
|
match_info = await request.app.router.resolve(alt_request)
|
|
alt_request._match_info = match_info # type: ignore
|
|
|
|
if match_info.http_exception is None:
|
|
return True, alt_request
|
|
|
|
return False, request
|
|
|
|
|
|
def middleware(f: _Func) -> _Func:
|
|
f.__middleware_version__ = 1 # type: ignore
|
|
return f
|
|
|
|
|
|
_Handler = Callable[[Request], Awaitable[StreamResponse]]
|
|
_Middleware = Callable[[Request, _Handler], Awaitable[StreamResponse]]
|
|
|
|
|
|
def normalize_path_middleware(
|
|
*,
|
|
append_slash: bool = True,
|
|
remove_slash: bool = False,
|
|
merge_slashes: bool = True,
|
|
redirect_class: Type[_HTTPMove] = HTTPPermanentRedirect
|
|
) -> _Middleware:
|
|
"""
|
|
Middleware factory which produces a middleware that normalizes
|
|
the path of a request. By normalizing it means:
|
|
|
|
- Add or remove a trailing slash to the path.
|
|
- Double slashes are replaced by one.
|
|
|
|
The middleware returns as soon as it finds a path that resolves
|
|
correctly. The order if both merge and append/remove are enabled is
|
|
1) merge slashes
|
|
2) append/remove slash
|
|
3) both merge slashes and append/remove slash.
|
|
If the path resolves with at least one of those conditions, it will
|
|
redirect to the new path.
|
|
|
|
Only one of `append_slash` and `remove_slash` can be enabled. If both
|
|
are `True` the factory will raise an assertion error
|
|
|
|
If `append_slash` is `True` the middleware will append a slash when
|
|
needed. If a resource is defined with trailing slash and the request
|
|
comes without it, it will append it automatically.
|
|
|
|
If `remove_slash` is `True`, `append_slash` must be `False`. When enabled
|
|
the middleware will remove trailing slashes and redirect if the resource
|
|
is defined
|
|
|
|
If merge_slashes is True, merge multiple consecutive slashes in the
|
|
path into one.
|
|
"""
|
|
|
|
correct_configuration = not (append_slash and remove_slash)
|
|
assert correct_configuration, "Cannot both remove and append slash"
|
|
|
|
@middleware
|
|
async def impl(request: Request, handler: _Handler) -> StreamResponse:
|
|
if isinstance(request.match_info.route, SystemRoute):
|
|
paths_to_check = []
|
|
if "?" in request.raw_path:
|
|
path, query = request.raw_path.split("?", 1)
|
|
query = "?" + query
|
|
else:
|
|
query = ""
|
|
path = request.raw_path
|
|
|
|
if merge_slashes:
|
|
paths_to_check.append(re.sub("//+", "/", path))
|
|
if append_slash and not request.path.endswith("/"):
|
|
paths_to_check.append(path + "/")
|
|
if remove_slash and request.path.endswith("/"):
|
|
paths_to_check.append(path[:-1])
|
|
if merge_slashes and append_slash:
|
|
paths_to_check.append(re.sub("//+", "/", path + "/"))
|
|
if merge_slashes and remove_slash:
|
|
merged_slashes = re.sub("//+", "/", path)
|
|
paths_to_check.append(merged_slashes[:-1])
|
|
|
|
for path in paths_to_check:
|
|
path = re.sub("^//+", "/", path) # SECURITY: GHSA-v6wp-4m6f-gcjg
|
|
resolves, request = await _check_request_resolves(request, path)
|
|
if resolves:
|
|
raise redirect_class(request.raw_path + query)
|
|
|
|
return await handler(request)
|
|
|
|
return impl
|
|
|
|
|
|
def _fix_request_current_app(app: "Application") -> _Middleware:
|
|
@middleware
|
|
async def impl(request: Request, handler: _Handler) -> StreamResponse:
|
|
with request.match_info.set_current_app(app):
|
|
return await handler(request)
|
|
|
|
return impl
|