update to python fastpi

Backend/venv/lib/python3.12/site-packages/websockets/uri.py

@@ -0,0 +1,225 @@
+from __future__ import annotations
+
+import dataclasses
+import urllib.parse
+import urllib.request
+
+from .exceptions import InvalidProxy, InvalidURI
+
+
+__all__ = ["parse_uri", "WebSocketURI"]
+
+
+# All characters from the gen-delims and sub-delims sets in RFC 3987.
+DELIMS = ":/?#[]@!$&'()*+,;="
+
+
+@dataclasses.dataclass
+class WebSocketURI:
+    """
+    WebSocket URI.
+
+    Attributes:
+        secure: :obj:`True` for a ``wss`` URI, :obj:`False` for a ``ws`` URI.
+        host: Normalized to lower case.
+        port: Always set even if it's the default.
+        path: May be empty.
+        query: May be empty if the URI doesn't include a query component.
+        username: Available when the URI contains `User Information`_.
+        password: Available when the URI contains `User Information`_.
+
+    .. _User Information: https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.1
+
+    """
+
+    secure: bool
+    host: str
+    port: int
+    path: str
+    query: str
+    username: str | None = None
+    password: str | None = None
+
+    @property
+    def resource_name(self) -> str:
+        if self.path:
+            resource_name = self.path
+        else:
+            resource_name = "/"
+        if self.query:
+            resource_name += "?" + self.query
+        return resource_name
+
+    @property
+    def user_info(self) -> tuple[str, str] | None:
+        if self.username is None:
+            return None
+        assert self.password is not None
+        return (self.username, self.password)
+
+
+def parse_uri(uri: str) -> WebSocketURI:
+    """
+    Parse and validate a WebSocket URI.
+
+    Args:
+        uri: WebSocket URI.
+
+    Returns:
+        Parsed WebSocket URI.
+
+    Raises:
+        InvalidURI: If ``uri`` isn't a valid WebSocket URI.
+
+    """
+    parsed = urllib.parse.urlparse(uri)
+    if parsed.scheme not in ["ws", "wss"]:
+        raise InvalidURI(uri, "scheme isn't ws or wss")
+    if parsed.hostname is None:
+        raise InvalidURI(uri, "hostname isn't provided")
+    if parsed.fragment != "":
+        raise InvalidURI(uri, "fragment identifier is meaningless")
+
+    secure = parsed.scheme == "wss"
+    host = parsed.hostname
+    port = parsed.port or (443 if secure else 80)
+    path = parsed.path
+    query = parsed.query
+    username = parsed.username
+    password = parsed.password
+    # urllib.parse.urlparse accepts URLs with a username but without a
+    # password. This doesn't make sense for HTTP Basic Auth credentials.
+    if username is not None and password is None:
+        raise InvalidURI(uri, "username provided without password")
+
+    try:
+        uri.encode("ascii")
+    except UnicodeEncodeError:
+        # Input contains non-ASCII characters.
+        # It must be an IRI. Convert it to a URI.
+        host = host.encode("idna").decode()
+        path = urllib.parse.quote(path, safe=DELIMS)
+        query = urllib.parse.quote(query, safe=DELIMS)
+        if username is not None:
+            assert password is not None
+            username = urllib.parse.quote(username, safe=DELIMS)
+            password = urllib.parse.quote(password, safe=DELIMS)
+
+    return WebSocketURI(secure, host, port, path, query, username, password)
+
+
+@dataclasses.dataclass
+class Proxy:
+    """
+    Proxy.
+
+    Attributes:
+        scheme: ``"socks5h"``, ``"socks5"``, ``"socks4a"``, ``"socks4"``,
+            ``"https"``, or ``"http"``.
+        host: Normalized to lower case.
+        port: Always set even if it's the default.
+        username: Available when the proxy address contains `User Information`_.
+        password: Available when the proxy address contains `User Information`_.
+
+    .. _User Information: https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.1
+
+    """
+
+    scheme: str
+    host: str
+    port: int
+    username: str | None = None
+    password: str | None = None
+
+    @property
+    def user_info(self) -> tuple[str, str] | None:
+        if self.username is None:
+            return None
+        assert self.password is not None
+        return (self.username, self.password)
+
+
+def parse_proxy(proxy: str) -> Proxy:
+    """
+    Parse and validate a proxy.
+
+    Args:
+        proxy: proxy.
+
+    Returns:
+        Parsed proxy.
+
+    Raises:
+        InvalidProxy: If ``proxy`` isn't a valid proxy.
+
+    """
+    parsed = urllib.parse.urlparse(proxy)
+    if parsed.scheme not in ["socks5h", "socks5", "socks4a", "socks4", "https", "http"]:
+        raise InvalidProxy(proxy, f"scheme {parsed.scheme} isn't supported")
+    if parsed.hostname is None:
+        raise InvalidProxy(proxy, "hostname isn't provided")
+    if parsed.path not in ["", "/"]:
+        raise InvalidProxy(proxy, "path is meaningless")
+    if parsed.query != "":
+        raise InvalidProxy(proxy, "query is meaningless")
+    if parsed.fragment != "":
+        raise InvalidProxy(proxy, "fragment is meaningless")
+
+    scheme = parsed.scheme
+    host = parsed.hostname
+    port = parsed.port or (443 if parsed.scheme == "https" else 80)
+    username = parsed.username
+    password = parsed.password
+    # urllib.parse.urlparse accepts URLs with a username but without a
+    # password. This doesn't make sense for HTTP Basic Auth credentials.
+    if username is not None and password is None:
+        raise InvalidProxy(proxy, "username provided without password")
+
+    try:
+        proxy.encode("ascii")
+    except UnicodeEncodeError:
+        # Input contains non-ASCII characters.
+        # It must be an IRI. Convert it to a URI.
+        host = host.encode("idna").decode()
+        if username is not None:
+            assert password is not None
+            username = urllib.parse.quote(username, safe=DELIMS)
+            password = urllib.parse.quote(password, safe=DELIMS)
+
+    return Proxy(scheme, host, port, username, password)
+
+
+def get_proxy(uri: WebSocketURI) -> str | None:
+    """
+    Return the proxy to use for connecting to the given WebSocket URI, if any.
+
+    """
+    if urllib.request.proxy_bypass(f"{uri.host}:{uri.port}"):
+        return None
+
+    # According to the _Proxy Usage_ section of RFC 6455, use a SOCKS5 proxy if
+    # available, else favor the proxy for HTTPS connections over the proxy for
+    # HTTP connections.
+
+    # The priority of a proxy for WebSocket connections is unspecified. We give
+    # it the highest priority. This makes it easy to configure a specific proxy
+    # for websockets.
+
+    # getproxies() may return SOCKS proxies as {"socks": "http://host:port"} or
+    # as {"https": "socks5h://host:port"} depending on whether they're declared
+    # in the operating system or in environment variables.
+
+    proxies = urllib.request.getproxies()
+    if uri.secure:
+        schemes = ["wss", "socks", "https"]
+    else:
+        schemes = ["ws", "socks", "https", "http"]
+
+    for scheme in schemes:
+        proxy = proxies.get(scheme)
+        if proxy is not None:
+            if scheme == "socks" and proxy.startswith("http://"):
+                proxy = "socks5h://" + proxy[7:]
+            return proxy
+    else:
+        return None