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Filename : socketserver.py
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#!/usr/bin/env python

"""
Dummy server used for unit testing.
"""

from __future__ import annotations

import logging
import os
import socket
import ssl
import sys
import threading
import typing
import warnings

import trustme
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization

from urllib3.exceptions import HTTPWarning
from urllib3.util import resolve_cert_reqs, resolve_ssl_version

if typing.TYPE_CHECKING:
    from typing_extensions import ParamSpec

    P = ParamSpec("P")

log = logging.getLogger(__name__)

CERTS_PATH = os.path.join(os.path.dirname(__file__), "certs")
DEFAULT_CERTS: dict[str, typing.Any] = {
    "certfile": os.path.join(CERTS_PATH, "server.crt"),
    "keyfile": os.path.join(CERTS_PATH, "server.key"),
    "cert_reqs": ssl.CERT_OPTIONAL,
    "ca_certs": os.path.join(CERTS_PATH, "cacert.pem"),
    "alpn_protocols": ["h2", "http/1.1"],
}
DEFAULT_CA = os.path.join(CERTS_PATH, "cacert.pem")
DEFAULT_CA_KEY = os.path.join(CERTS_PATH, "cacert.key")


def _resolves_to_ipv6(host: str) -> bool:
    """Returns True if the system resolves host to an IPv6 address by default."""
    resolves_to_ipv6 = False
    try:
        for res in socket.getaddrinfo(host, None, socket.AF_UNSPEC):
            af, _, _, _, _ = res
            if af == socket.AF_INET6:
                resolves_to_ipv6 = True
    except socket.gaierror:
        pass

    return resolves_to_ipv6


def _has_ipv6(host: str) -> bool:
    """Returns True if the system can bind an IPv6 address."""
    sock = None
    has_ipv6 = False

    if socket.has_ipv6:
        # has_ipv6 returns true if cPython was compiled with IPv6 support.
        # It does not tell us if the system has IPv6 support enabled. To
        # determine that we must bind to an IPv6 address.
        # https://github.com/urllib3/urllib3/pull/611
        # https://bugs.python.org/issue658327
        try:
            sock = socket.socket(socket.AF_INET6)
            sock.bind((host, 0))
            has_ipv6 = _resolves_to_ipv6("localhost")
        except Exception:
            pass

    if sock:
        sock.close()
    return has_ipv6


# Some systems may have IPv6 support but DNS may not be configured
# properly. We can not count that localhost will resolve to ::1 on all
# systems. See https://github.com/urllib3/urllib3/pull/611 and
# https://bugs.python.org/issue18792
HAS_IPV6_AND_DNS = _has_ipv6("localhost")
HAS_IPV6 = _has_ipv6("::1")


# Different types of servers we have:


class NoIPv6Warning(HTTPWarning):
    "IPv6 is not available"


class SocketServerThread(threading.Thread):
    """
    :param socket_handler: Callable which receives a socket argument for one
        request.
    :param ready_event: Event which gets set when the socket handler is
        ready to receive requests.
    """

    USE_IPV6 = HAS_IPV6_AND_DNS

    def __init__(
        self,
        socket_handler: typing.Callable[[socket.socket], None],
        host: str = "localhost",
        ready_event: threading.Event | None = None,
        quit_event: threading.Event | None = None,
    ) -> None:
        super().__init__()
        self.daemon = True

        self.socket_handler = socket_handler
        self.host = host
        self.ready_event = ready_event
        self.quit_event = quit_event

    def _start_server(self) -> None:
        if self.USE_IPV6:
            sock = socket.socket(socket.AF_INET6)
        else:
            warnings.warn("No IPv6 support. Falling back to IPv4.", NoIPv6Warning)
            sock = socket.socket(socket.AF_INET)
        if sys.platform != "win32":
            sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

        with sock:
            sock.bind((self.host, 0))
            self.port = sock.getsockname()[1]

            # Once listen() returns, the server socket is ready
            sock.listen(1)

            if self.ready_event:
                self.ready_event.set()

            self.socket_handler(sock)

    def run(self) -> None:
        self._start_server()


def ssl_options_to_context(  # type: ignore[no-untyped-def]
    keyfile=None,
    certfile=None,
    server_side=None,
    cert_reqs=None,
    ssl_version: str | int | None = None,
    ca_certs=None,
    do_handshake_on_connect=None,
    suppress_ragged_eofs=None,
    ciphers=None,
    alpn_protocols=None,
) -> ssl.SSLContext:
    """Return an equivalent SSLContext based on ssl.wrap_socket args."""
    ssl_version = resolve_ssl_version(ssl_version)
    cert_none = resolve_cert_reqs("CERT_NONE")
    if cert_reqs is None:
        cert_reqs = cert_none
    else:
        cert_reqs = resolve_cert_reqs(cert_reqs)

    ctx = ssl.SSLContext(ssl_version)
    ctx.load_cert_chain(certfile, keyfile)
    ctx.verify_mode = cert_reqs
    if ctx.verify_mode != cert_none:
        ctx.load_verify_locations(cafile=ca_certs)
    if alpn_protocols and hasattr(ctx, "set_alpn_protocols"):
        try:
            ctx.set_alpn_protocols(alpn_protocols)
        except NotImplementedError:
            pass
    return ctx


def get_unreachable_address() -> tuple[str, int]:
    # reserved as per rfc2606
    return ("something.invalid", 54321)


def encrypt_key_pem(private_key_pem: trustme.Blob, password: bytes) -> trustme.Blob:
    private_key = serialization.load_pem_private_key(
        private_key_pem.bytes(), password=None, backend=default_backend()
    )
    encrypted_key = private_key.private_bytes(
        serialization.Encoding.PEM,
        serialization.PrivateFormat.TraditionalOpenSSL,
        serialization.BestAvailableEncryption(password),
    )
    return trustme.Blob(encrypted_key)