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annotate lib/python3.8/site-packages/pip/_internal/network/session.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 """PipSession and supporting code, containing all pip-specific
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2 network request configuration and behavior.
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3 """
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4
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5 # The following comment should be removed at some point in the future.
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6 # mypy: disallow-untyped-defs=False
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7
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8 import email.utils
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9 import json
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10 import logging
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11 import mimetypes
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12 import os
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13 import platform
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14 import sys
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15 import warnings
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16
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17 from pip._vendor import requests, six, urllib3
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18 from pip._vendor.cachecontrol import CacheControlAdapter
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19 from pip._vendor.requests.adapters import BaseAdapter, HTTPAdapter
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20 from pip._vendor.requests.models import Response
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21 from pip._vendor.requests.structures import CaseInsensitiveDict
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22 from pip._vendor.six.moves.urllib import parse as urllib_parse
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23 from pip._vendor.urllib3.exceptions import InsecureRequestWarning
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24
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25 from pip import __version__
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26 from pip._internal.network.auth import MultiDomainBasicAuth
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27 from pip._internal.network.cache import SafeFileCache
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28 # Import ssl from compat so the initial import occurs in only one place.
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29 from pip._internal.utils.compat import has_tls, ipaddress
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30 from pip._internal.utils.glibc import libc_ver
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31 from pip._internal.utils.misc import (
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32 build_url_from_netloc,
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33 get_installed_version,
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34 parse_netloc,
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35 )
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36 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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37 from pip._internal.utils.urls import url_to_path
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38
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39 if MYPY_CHECK_RUNNING:
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40 from typing import (
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41 Iterator, List, Optional, Tuple, Union,
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42 )
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43
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44 from pip._internal.models.link import Link
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45
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46 SecureOrigin = Tuple[str, str, Optional[Union[int, str]]]
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47
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48
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49 logger = logging.getLogger(__name__)
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50
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51
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52 # Ignore warning raised when using --trusted-host.
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53 warnings.filterwarnings("ignore", category=InsecureRequestWarning)
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54
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55
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56 SECURE_ORIGINS = [
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57 # protocol, hostname, port
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58 # Taken from Chrome's list of secure origins (See: http://bit.ly/1qrySKC)
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59 ("https", "*", "*"),
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60 ("*", "localhost", "*"),
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61 ("*", "127.0.0.0/8", "*"),
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62 ("*", "::1/128", "*"),
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63 ("file", "*", None),
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64 # ssh is always secure.
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65 ("ssh", "*", "*"),
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66 ] # type: List[SecureOrigin]
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67
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68
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69 # These are environment variables present when running under various
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70 # CI systems. For each variable, some CI systems that use the variable
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71 # are indicated. The collection was chosen so that for each of a number
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72 # of popular systems, at least one of the environment variables is used.
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73 # This list is used to provide some indication of and lower bound for
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74 # CI traffic to PyPI. Thus, it is okay if the list is not comprehensive.
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75 # For more background, see: https://github.com/pypa/pip/issues/5499
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76 CI_ENVIRONMENT_VARIABLES = (
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77 # Azure Pipelines
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78 'BUILD_BUILDID',
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79 # Jenkins
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80 'BUILD_ID',
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81 # AppVeyor, CircleCI, Codeship, Gitlab CI, Shippable, Travis CI
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82 'CI',
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83 # Explicit environment variable.
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84 'PIP_IS_CI',
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85 )
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86
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87
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88 def looks_like_ci():
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89 # type: () -> bool
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90 """
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91 Return whether it looks like pip is running under CI.
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92 """
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93 # We don't use the method of checking for a tty (e.g. using isatty())
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94 # because some CI systems mimic a tty (e.g. Travis CI). Thus that
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95 # method doesn't provide definitive information in either direction.
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96 return any(name in os.environ for name in CI_ENVIRONMENT_VARIABLES)
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97
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98
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99 def user_agent():
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100 """
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101 Return a string representing the user agent.
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102 """
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103 data = {
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104 "installer": {"name": "pip", "version": __version__},
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105 "python": platform.python_version(),
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106 "implementation": {
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107 "name": platform.python_implementation(),
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108 },
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109 }
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110
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111 if data["implementation"]["name"] == 'CPython':
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112 data["implementation"]["version"] = platform.python_version()
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113 elif data["implementation"]["name"] == 'PyPy':
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114 if sys.pypy_version_info.releaselevel == 'final':
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115 pypy_version_info = sys.pypy_version_info[:3]
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116 else:
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117 pypy_version_info = sys.pypy_version_info
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118 data["implementation"]["version"] = ".".join(
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119 [str(x) for x in pypy_version_info]
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120 )
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121 elif data["implementation"]["name"] == 'Jython':
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122 # Complete Guess
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123 data["implementation"]["version"] = platform.python_version()
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124 elif data["implementation"]["name"] == 'IronPython':
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125 # Complete Guess
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126 data["implementation"]["version"] = platform.python_version()
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127
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128 if sys.platform.startswith("linux"):
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129 from pip._vendor import distro
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130 distro_infos = dict(filter(
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131 lambda x: x[1],
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132 zip(["name", "version", "id"], distro.linux_distribution()),
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133 ))
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134 libc = dict(filter(
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135 lambda x: x[1],
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136 zip(["lib", "version"], libc_ver()),
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137 ))
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138 if libc:
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139 distro_infos["libc"] = libc
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140 if distro_infos:
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141 data["distro"] = distro_infos
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142
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143 if sys.platform.startswith("darwin") and platform.mac_ver()[0]:
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144 data["distro"] = {"name": "macOS", "version": platform.mac_ver()[0]}
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145
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146 if platform.system():
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147 data.setdefault("system", {})["name"] = platform.system()
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148
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149 if platform.release():
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150 data.setdefault("system", {})["release"] = platform.release()
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151
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152 if platform.machine():
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153 data["cpu"] = platform.machine()
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154
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155 if has_tls():
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156 import _ssl as ssl
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157 data["openssl_version"] = ssl.OPENSSL_VERSION
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158
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159 setuptools_version = get_installed_version("setuptools")
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160 if setuptools_version is not None:
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161 data["setuptools_version"] = setuptools_version
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162
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163 # Use None rather than False so as not to give the impression that
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164 # pip knows it is not being run under CI. Rather, it is a null or
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165 # inconclusive result. Also, we include some value rather than no
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166 # value to make it easier to know that the check has been run.
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167 data["ci"] = True if looks_like_ci() else None
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168
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169 user_data = os.environ.get("PIP_USER_AGENT_USER_DATA")
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170 if user_data is not None:
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171 data["user_data"] = user_data
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172
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173 return "{data[installer][name]}/{data[installer][version]} {json}".format(
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174 data=data,
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175 json=json.dumps(data, separators=(",", ":"), sort_keys=True),
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176 )
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177
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178
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179 class LocalFSAdapter(BaseAdapter):
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180
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181 def send(self, request, stream=None, timeout=None, verify=None, cert=None,
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182 proxies=None):
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183 pathname = url_to_path(request.url)
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184
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185 resp = Response()
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186 resp.status_code = 200
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187 resp.url = request.url
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188
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189 try:
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190 stats = os.stat(pathname)
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191 except OSError as exc:
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192 resp.status_code = 404
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193 resp.raw = exc
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194 else:
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195 modified = email.utils.formatdate(stats.st_mtime, usegmt=True)
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196 content_type = mimetypes.guess_type(pathname)[0] or "text/plain"
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197 resp.headers = CaseInsensitiveDict({
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198 "Content-Type": content_type,
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199 "Content-Length": stats.st_size,
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200 "Last-Modified": modified,
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201 })
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202
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203 resp.raw = open(pathname, "rb")
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204 resp.close = resp.raw.close
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205
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206 return resp
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207
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208 def close(self):
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209 pass
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210
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211
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212 class InsecureHTTPAdapter(HTTPAdapter):
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213
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214 def cert_verify(self, conn, url, verify, cert):
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215 super(InsecureHTTPAdapter, self).cert_verify(
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216 conn=conn, url=url, verify=False, cert=cert
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217 )
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218
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219
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220 class PipSession(requests.Session):
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221
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222 timeout = None # type: Optional[int]
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223
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224 def __init__(self, *args, **kwargs):
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225 """
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226 :param trusted_hosts: Domains not to emit warnings for when not using
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227 HTTPS.
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228 """
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229 retries = kwargs.pop("retries", 0)
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230 cache = kwargs.pop("cache", None)
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231 trusted_hosts = kwargs.pop("trusted_hosts", []) # type: List[str]
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232 index_urls = kwargs.pop("index_urls", None)
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233
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234 super(PipSession, self).__init__(*args, **kwargs)
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235
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236 # Namespace the attribute with "pip_" just in case to prevent
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237 # possible conflicts with the base class.
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238 self.pip_trusted_origins = [] # type: List[Tuple[str, Optional[int]]]
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239
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240 # Attach our User Agent to the request
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241 self.headers["User-Agent"] = user_agent()
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242
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243 # Attach our Authentication handler to the session
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244 self.auth = MultiDomainBasicAuth(index_urls=index_urls)
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245
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246 # Create our urllib3.Retry instance which will allow us to customize
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247 # how we handle retries.
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248 retries = urllib3.Retry(
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249 # Set the total number of retries that a particular request can
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250 # have.
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251 total=retries,
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252
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253 # A 503 error from PyPI typically means that the Fastly -> Origin
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254 # connection got interrupted in some way. A 503 error in general
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255 # is typically considered a transient error so we'll go ahead and
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256 # retry it.
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257 # A 500 may indicate transient error in Amazon S3
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258 # A 520 or 527 - may indicate transient error in CloudFlare
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259 status_forcelist=[500, 503, 520, 527],
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260
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261 # Add a small amount of back off between failed requests in
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262 # order to prevent hammering the service.
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263 backoff_factor=0.25,
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264 )
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265
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266 # We want to _only_ cache responses on securely fetched origins. We do
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267 # this because we can't validate the response of an insecurely fetched
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268 # origin, and we don't want someone to be able to poison the cache and
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269 # require manual eviction from the cache to fix it.
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270 if cache:
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271 secure_adapter = CacheControlAdapter(
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272 cache=SafeFileCache(cache),
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273 max_retries=retries,
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274 )
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275 else:
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276 secure_adapter = HTTPAdapter(max_retries=retries)
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277
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278 # Our Insecure HTTPAdapter disables HTTPS validation. It does not
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279 # support caching (see above) so we'll use it for all http:// URLs as
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280 # well as any https:// host that we've marked as ignoring TLS errors
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281 # for.
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282 insecure_adapter = InsecureHTTPAdapter(max_retries=retries)
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283 # Save this for later use in add_insecure_host().
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284 self._insecure_adapter = insecure_adapter
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285
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286 self.mount("https://", secure_adapter)
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287 self.mount("http://", insecure_adapter)
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288
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289 # Enable file:// urls
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290 self.mount("file://", LocalFSAdapter())
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291
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292 for host in trusted_hosts:
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293 self.add_trusted_host(host, suppress_logging=True)
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294
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295 def add_trusted_host(self, host, source=None, suppress_logging=False):
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296 # type: (str, Optional[str], bool) -> None
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297 """
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298 :param host: It is okay to provide a host that has previously been
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299 added.
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300 :param source: An optional source string, for logging where the host
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301 string came from.
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302 """
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303 if not suppress_logging:
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304 msg = 'adding trusted host: {!r}'.format(host)
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305 if source is not None:
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306 msg += ' (from {})'.format(source)
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307 logger.info(msg)
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308
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309 host_port = parse_netloc(host)
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310 if host_port not in self.pip_trusted_origins:
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311 self.pip_trusted_origins.append(host_port)
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312
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313 self.mount(build_url_from_netloc(host) + '/', self._insecure_adapter)
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314 if not host_port[1]:
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315 # Mount wildcard ports for the same host.
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316 self.mount(
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317 build_url_from_netloc(host) + ':',
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318 self._insecure_adapter
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319 )
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320
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321 def iter_secure_origins(self):
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322 # type: () -> Iterator[SecureOrigin]
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323 for secure_origin in SECURE_ORIGINS:
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324 yield secure_origin
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325 for host, port in self.pip_trusted_origins:
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326 yield ('*', host, '*' if port is None else port)
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327
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328 def is_secure_origin(self, location):
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329 # type: (Link) -> bool
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330 # Determine if this url used a secure transport mechanism
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331 parsed = urllib_parse.urlparse(str(location))
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332 origin_protocol, origin_host, origin_port = (
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333 parsed.scheme, parsed.hostname, parsed.port,
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334 )
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335
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336 # The protocol to use to see if the protocol matches.
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337 # Don't count the repository type as part of the protocol: in
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338 # cases such as "git+ssh", only use "ssh". (I.e., Only verify against
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339 # the last scheme.)
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340 origin_protocol = origin_protocol.rsplit('+', 1)[-1]
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341
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342 # Determine if our origin is a secure origin by looking through our
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343 # hardcoded list of secure origins, as well as any additional ones
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344 # configured on this PackageFinder instance.
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345 for secure_origin in self.iter_secure_origins():
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346 secure_protocol, secure_host, secure_port = secure_origin
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347 if origin_protocol != secure_protocol and secure_protocol != "*":
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348 continue
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349
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350 try:
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351 addr = ipaddress.ip_address(
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352 None
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353 if origin_host is None
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354 else six.ensure_text(origin_host)
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355 )
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356 network = ipaddress.ip_network(
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357 six.ensure_text(secure_host)
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358 )
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359 except ValueError:
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360 # We don't have both a valid address or a valid network, so
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361 # we'll check this origin against hostnames.
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362 if (
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363 origin_host and
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364 origin_host.lower() != secure_host.lower() and
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365 secure_host != "*"
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366 ):
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367 continue
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368 else:
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369 # We have a valid address and network, so see if the address
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370 # is contained within the network.
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371 if addr not in network:
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372 continue
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373
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374 # Check to see if the port matches.
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375 if (
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376 origin_port != secure_port and
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377 secure_port != "*" and
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378 secure_port is not None
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379 ):
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380 continue
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381
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382 # If we've gotten here, then this origin matches the current
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383 # secure origin and we should return True
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384 return True
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385
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386 # If we've gotten to this point, then the origin isn't secure and we
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387 # will not accept it as a valid location to search. We will however
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388 # log a warning that we are ignoring it.
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389 logger.warning(
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390 "The repository located at %s is not a trusted or secure host and "
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391 "is being ignored. If this repository is available via HTTPS we "
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392 "recommend you use HTTPS instead, otherwise you may silence "
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393 "this warning and allow it anyway with '--trusted-host %s'.",
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394 origin_host,
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395 origin_host,
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396 )
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397
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398 return False
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399
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400 def request(self, method, url, *args, **kwargs):
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401 # Allow setting a default timeout on a session
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402 kwargs.setdefault("timeout", self.timeout)
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403
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404 # Dispatch the actual request
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405 return super(PipSession, self).request(method, url, *args, **kwargs)