143 lines
4.1 KiB
Python
143 lines
4.1 KiB
Python
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import typing as t
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from .._internal import _encode_idna
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from ..exceptions import SecurityError
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from ..urls import uri_to_iri
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from ..urls import url_quote
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def host_is_trusted(hostname: str, trusted_list: t.Iterable[str]) -> bool:
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"""Check if a host matches a list of trusted names.
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:param hostname: The name to check.
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:param trusted_list: A list of valid names to match. If a name
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starts with a dot it will match all subdomains.
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.. versionadded:: 0.9
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"""
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if not hostname:
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return False
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if isinstance(trusted_list, str):
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trusted_list = [trusted_list]
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def _normalize(hostname: str) -> bytes:
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if ":" in hostname:
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hostname = hostname.rsplit(":", 1)[0]
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return _encode_idna(hostname)
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try:
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hostname_bytes = _normalize(hostname)
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except UnicodeError:
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return False
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for ref in trusted_list:
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if ref.startswith("."):
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ref = ref[1:]
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suffix_match = True
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else:
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suffix_match = False
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try:
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ref_bytes = _normalize(ref)
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except UnicodeError:
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return False
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if ref_bytes == hostname_bytes:
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return True
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if suffix_match and hostname_bytes.endswith(b"." + ref_bytes):
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return True
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return False
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def get_host(
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scheme: str,
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host_header: t.Optional[str],
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server: t.Optional[t.Tuple[str, t.Optional[int]]] = None,
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trusted_hosts: t.Optional[t.Iterable[str]] = None,
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) -> str:
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"""Return the host for the given parameters.
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This first checks the ``host_header``. If it's not present, then
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``server`` is used. The host will only contain the port if it is
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different than the standard port for the protocol.
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Optionally, verify that the host is trusted using
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:func:`host_is_trusted` and raise a
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:exc:`~werkzeug.exceptions.SecurityError` if it is not.
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:param scheme: The protocol the request used, like ``"https"``.
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:param host_header: The ``Host`` header value.
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:param server: Address of the server. ``(host, port)``, or
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``(path, None)`` for unix sockets.
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:param trusted_hosts: A list of trusted host names.
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:return: Host, with port if necessary.
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:raise ~werkzeug.exceptions.SecurityError: If the host is not
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trusted.
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"""
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host = ""
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if host_header is not None:
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host = host_header
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elif server is not None:
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host = server[0]
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if server[1] is not None:
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host = f"{host}:{server[1]}"
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if scheme in {"http", "ws"} and host.endswith(":80"):
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host = host[:-3]
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elif scheme in {"https", "wss"} and host.endswith(":443"):
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host = host[:-4]
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if trusted_hosts is not None:
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if not host_is_trusted(host, trusted_hosts):
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raise SecurityError(f"Host {host!r} is not trusted.")
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return host
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def get_current_url(
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scheme: str,
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host: str,
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root_path: t.Optional[str] = None,
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path: t.Optional[str] = None,
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query_string: t.Optional[bytes] = None,
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) -> str:
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"""Recreate the URL for a request. If an optional part isn't
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provided, it and subsequent parts are not included in the URL.
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The URL is an IRI, not a URI, so it may contain Unicode characters.
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Use :func:`~werkzeug.urls.iri_to_uri` to convert it to ASCII.
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:param scheme: The protocol the request used, like ``"https"``.
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:param host: The host the request was made to. See :func:`get_host`.
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:param root_path: Prefix that the application is mounted under. This
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is prepended to ``path``.
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:param path: The path part of the URL after ``root_path``.
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:param query_string: The portion of the URL after the "?".
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"""
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url = [scheme, "://", host]
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if root_path is None:
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url.append("/")
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return uri_to_iri("".join(url))
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url.append(url_quote(root_path.rstrip("/")))
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url.append("/")
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if path is None:
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return uri_to_iri("".join(url))
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url.append(url_quote(path.lstrip("/")))
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if query_string:
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url.append("?")
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url.append(url_quote(query_string, safe=":&%=+$!*'(),"))
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return uri_to_iri("".join(url))
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