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annotate env/lib/python3.9/site-packages/urllib3/util/proxy.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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1 from .ssl_ import create_urllib3_context, resolve_cert_reqs, resolve_ssl_version
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2
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3
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4 def connection_requires_http_tunnel(
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5 proxy_url=None, proxy_config=None, destination_scheme=None
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6 ):
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7 """
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8 Returns True if the connection requires an HTTP CONNECT through the proxy.
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9
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10 :param URL proxy_url:
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11 URL of the proxy.
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12 :param ProxyConfig proxy_config:
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13 Proxy configuration from poolmanager.py
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14 :param str destination_scheme:
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15 The scheme of the destination. (i.e https, http, etc)
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16 """
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17 # If we're not using a proxy, no way to use a tunnel.
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18 if proxy_url is None:
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19 return False
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20
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21 # HTTP destinations never require tunneling, we always forward.
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22 if destination_scheme == "http":
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23 return False
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24
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25 # Support for forwarding with HTTPS proxies and HTTPS destinations.
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26 if (
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27 proxy_url.scheme == "https"
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28 and proxy_config
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29 and proxy_config.use_forwarding_for_https
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30 ):
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31 return False
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32
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33 # Otherwise always use a tunnel.
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34 return True
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35
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36
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37 def create_proxy_ssl_context(
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38 ssl_version, cert_reqs, ca_certs=None, ca_cert_dir=None, ca_cert_data=None
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39 ):
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40 """
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41 Generates a default proxy ssl context if one hasn't been provided by the
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42 user.
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43 """
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44 ssl_context = create_urllib3_context(
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45 ssl_version=resolve_ssl_version(ssl_version),
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46 cert_reqs=resolve_cert_reqs(cert_reqs),
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47 )
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48 if (
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49 not ca_certs
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50 and not ca_cert_dir
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51 and not ca_cert_data
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52 and hasattr(ssl_context, "load_default_certs")
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53 ):
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54 ssl_context.load_default_certs()
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55
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56 return ssl_context