forked from bton/matekasse
159 lines
4.8 KiB
Python
159 lines
4.8 KiB
Python
from __future__ import annotations
|
|
|
|
import typing as t
|
|
from urllib.parse import quote
|
|
|
|
from .._internal import _plain_int
|
|
from ..exceptions import SecurityError
|
|
from ..urls import uri_to_iri
|
|
|
|
|
|
def host_is_trusted(hostname: str, trusted_list: t.Iterable[str]) -> bool:
|
|
"""Check if a host matches a list of trusted names.
|
|
|
|
:param hostname: The name to check.
|
|
:param trusted_list: A list of valid names to match. If a name
|
|
starts with a dot it will match all subdomains.
|
|
|
|
.. versionadded:: 0.9
|
|
"""
|
|
if not hostname:
|
|
return False
|
|
|
|
try:
|
|
hostname = hostname.partition(":")[0].encode("idna").decode("ascii")
|
|
except UnicodeEncodeError:
|
|
return False
|
|
|
|
if isinstance(trusted_list, str):
|
|
trusted_list = [trusted_list]
|
|
|
|
for ref in trusted_list:
|
|
if ref.startswith("."):
|
|
ref = ref[1:]
|
|
suffix_match = True
|
|
else:
|
|
suffix_match = False
|
|
|
|
try:
|
|
ref = ref.partition(":")[0].encode("idna").decode("ascii")
|
|
except UnicodeEncodeError:
|
|
return False
|
|
|
|
if ref == hostname or (suffix_match and hostname.endswith(f".{ref}")):
|
|
return True
|
|
|
|
return False
|
|
|
|
|
|
def get_host(
|
|
scheme: str,
|
|
host_header: str | None,
|
|
server: tuple[str, int | None] | None = None,
|
|
trusted_hosts: t.Iterable[str] | None = None,
|
|
) -> str:
|
|
"""Return the host for the given parameters.
|
|
|
|
This first checks the ``host_header``. If it's not present, then
|
|
``server`` is used. The host will only contain the port if it is
|
|
different than the standard port for the protocol.
|
|
|
|
Optionally, verify that the host is trusted using
|
|
:func:`host_is_trusted` and raise a
|
|
:exc:`~werkzeug.exceptions.SecurityError` if it is not.
|
|
|
|
:param scheme: The protocol the request used, like ``"https"``.
|
|
:param host_header: The ``Host`` header value.
|
|
:param server: Address of the server. ``(host, port)``, or
|
|
``(path, None)`` for unix sockets.
|
|
:param trusted_hosts: A list of trusted host names.
|
|
|
|
:return: Host, with port if necessary.
|
|
:raise ~werkzeug.exceptions.SecurityError: If the host is not
|
|
trusted.
|
|
"""
|
|
host = ""
|
|
|
|
if host_header is not None:
|
|
host = host_header
|
|
elif server is not None:
|
|
host = server[0]
|
|
|
|
if server[1] is not None:
|
|
host = f"{host}:{server[1]}"
|
|
|
|
if scheme in {"http", "ws"} and host.endswith(":80"):
|
|
host = host[:-3]
|
|
elif scheme in {"https", "wss"} and host.endswith(":443"):
|
|
host = host[:-4]
|
|
|
|
if trusted_hosts is not None:
|
|
if not host_is_trusted(host, trusted_hosts):
|
|
raise SecurityError(f"Host {host!r} is not trusted.")
|
|
|
|
return host
|
|
|
|
|
|
def get_current_url(
|
|
scheme: str,
|
|
host: str,
|
|
root_path: str | None = None,
|
|
path: str | None = None,
|
|
query_string: bytes | None = None,
|
|
) -> str:
|
|
"""Recreate the URL for a request. If an optional part isn't
|
|
provided, it and subsequent parts are not included in the URL.
|
|
|
|
The URL is an IRI, not a URI, so it may contain Unicode characters.
|
|
Use :func:`~werkzeug.urls.iri_to_uri` to convert it to ASCII.
|
|
|
|
:param scheme: The protocol the request used, like ``"https"``.
|
|
:param host: The host the request was made to. See :func:`get_host`.
|
|
:param root_path: Prefix that the application is mounted under. This
|
|
is prepended to ``path``.
|
|
:param path: The path part of the URL after ``root_path``.
|
|
:param query_string: The portion of the URL after the "?".
|
|
"""
|
|
url = [scheme, "://", host]
|
|
|
|
if root_path is None:
|
|
url.append("/")
|
|
return uri_to_iri("".join(url))
|
|
|
|
# safe = https://url.spec.whatwg.org/#url-path-segment-string
|
|
# as well as percent for things that are already quoted
|
|
url.append(quote(root_path.rstrip("/"), safe="!$&'()*+,/:;=@%"))
|
|
url.append("/")
|
|
|
|
if path is None:
|
|
return uri_to_iri("".join(url))
|
|
|
|
url.append(quote(path.lstrip("/"), safe="!$&'()*+,/:;=@%"))
|
|
|
|
if query_string:
|
|
url.append("?")
|
|
url.append(quote(query_string, safe="!$&'()*+,/:;=?@%"))
|
|
|
|
return uri_to_iri("".join(url))
|
|
|
|
|
|
def get_content_length(
|
|
http_content_length: str | None = None,
|
|
http_transfer_encoding: str | None = None,
|
|
) -> int | None:
|
|
"""Return the ``Content-Length`` header value as an int. If the header is not given
|
|
or the ``Transfer-Encoding`` header is ``chunked``, ``None`` is returned to indicate
|
|
a streaming request. If the value is not an integer, or negative, 0 is returned.
|
|
|
|
:param http_content_length: The Content-Length HTTP header.
|
|
:param http_transfer_encoding: The Transfer-Encoding HTTP header.
|
|
|
|
.. versionadded:: 2.2
|
|
"""
|
|
if http_transfer_encoding == "chunked" or http_content_length is None:
|
|
return None
|
|
|
|
try:
|
|
return max(0, _plain_int(http_content_length))
|
|
except ValueError:
|
|
return 0
|