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from .ssl_ import create_urllib3_context, resolve_cert_reqs, resolve_ssl_version | |
def connection_requires_http_tunnel( | |
proxy_url=None, proxy_config=None, destination_scheme=None | |
): | |
""" | |
Returns True if the connection requires an HTTP CONNECT through the proxy. | |
:param URL proxy_url: | |
URL of the proxy. | |
:param ProxyConfig proxy_config: | |
Proxy configuration from poolmanager.py | |
:param str destination_scheme: | |
The scheme of the destination. (i.e https, http, etc) | |
""" | |
# If we're not using a proxy, no way to use a tunnel. | |
if proxy_url is None: | |
return False | |
# HTTP destinations never require tunneling, we always forward. | |
if destination_scheme == "http": | |
return False | |
# Support for forwarding with HTTPS proxies and HTTPS destinations. | |
if ( | |
proxy_url.scheme == "https" | |
and proxy_config | |
and proxy_config.use_forwarding_for_https | |
): | |
return False | |
# Otherwise always use a tunnel. | |
return True | |
def create_proxy_ssl_context( | |
ssl_version, cert_reqs, ca_certs=None, ca_cert_dir=None, ca_cert_data=None | |
): | |
""" | |
Generates a default proxy ssl context if one hasn't been provided by the | |
user. | |
""" | |
ssl_context = create_urllib3_context( | |
ssl_version=resolve_ssl_version(ssl_version), | |
cert_reqs=resolve_cert_reqs(cert_reqs), | |
) | |
if ( | |
not ca_certs | |
and not ca_cert_dir | |
and not ca_cert_data | |
and hasattr(ssl_context, "load_default_certs") | |
): | |
ssl_context.load_default_certs() | |
return ssl_context | |