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annotate lib/python3.8/site-packages/pip/_internal/network/auth.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 """Network Authentication Helpers
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2
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3 Contains interface (MultiDomainBasicAuth) and associated glue code for
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4 providing credentials in the context of network requests.
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5 """
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6
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7 # The following comment should be removed at some point in the future.
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8 # mypy: disallow-untyped-defs=False
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9
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10 import logging
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11
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12 from pip._vendor.requests.auth import AuthBase, HTTPBasicAuth
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13 from pip._vendor.requests.utils import get_netrc_auth
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14 from pip._vendor.six.moves.urllib import parse as urllib_parse
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15
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16 from pip._internal.utils.misc import (
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17 ask,
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18 ask_input,
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19 ask_password,
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20 remove_auth_from_url,
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21 split_auth_netloc_from_url,
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22 )
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23 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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24
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25 if MYPY_CHECK_RUNNING:
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26 from optparse import Values
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27 from typing import Dict, Optional, Tuple
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28
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29 from pip._internal.vcs.versioncontrol import AuthInfo
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30
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31 Credentials = Tuple[str, str, str]
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32
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33 logger = logging.getLogger(__name__)
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34
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35 try:
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36 import keyring # noqa
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37 except ImportError:
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38 keyring = None
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39 except Exception as exc:
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40 logger.warning(
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41 "Keyring is skipped due to an exception: %s", str(exc),
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42 )
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43 keyring = None
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44
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45
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46 def get_keyring_auth(url, username):
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47 """Return the tuple auth for a given url from keyring."""
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48 if not url or not keyring:
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49 return None
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50
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51 try:
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52 try:
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53 get_credential = keyring.get_credential
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54 except AttributeError:
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55 pass
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56 else:
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57 logger.debug("Getting credentials from keyring for %s", url)
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58 cred = get_credential(url, username)
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59 if cred is not None:
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60 return cred.username, cred.password
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61 return None
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62
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63 if username:
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64 logger.debug("Getting password from keyring for %s", url)
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65 password = keyring.get_password(url, username)
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66 if password:
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67 return username, password
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68
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69 except Exception as exc:
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70 logger.warning(
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71 "Keyring is skipped due to an exception: %s", str(exc),
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72 )
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73
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74
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75 class MultiDomainBasicAuth(AuthBase):
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76
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77 def __init__(self, prompting=True, index_urls=None):
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78 # type: (bool, Optional[Values]) -> None
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79 self.prompting = prompting
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80 self.index_urls = index_urls
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81 self.passwords = {} # type: Dict[str, AuthInfo]
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82 # When the user is prompted to enter credentials and keyring is
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83 # available, we will offer to save them. If the user accepts,
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84 # this value is set to the credentials they entered. After the
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85 # request authenticates, the caller should call
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86 # ``save_credentials`` to save these.
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87 self._credentials_to_save = None # type: Optional[Credentials]
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88
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89 def _get_index_url(self, url):
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90 """Return the original index URL matching the requested URL.
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91
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92 Cached or dynamically generated credentials may work against
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93 the original index URL rather than just the netloc.
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94
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95 The provided url should have had its username and password
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96 removed already. If the original index url had credentials then
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97 they will be included in the return value.
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98
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99 Returns None if no matching index was found, or if --no-index
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100 was specified by the user.
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101 """
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102 if not url or not self.index_urls:
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103 return None
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104
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105 for u in self.index_urls:
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106 prefix = remove_auth_from_url(u).rstrip("/") + "/"
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107 if url.startswith(prefix):
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108 return u
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109
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110 def _get_new_credentials(self, original_url, allow_netrc=True,
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111 allow_keyring=True):
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112 """Find and return credentials for the specified URL."""
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113 # Split the credentials and netloc from the url.
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114 url, netloc, url_user_password = split_auth_netloc_from_url(
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115 original_url,
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116 )
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117
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118 # Start with the credentials embedded in the url
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119 username, password = url_user_password
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120 if username is not None and password is not None:
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121 logger.debug("Found credentials in url for %s", netloc)
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122 return url_user_password
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123
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124 # Find a matching index url for this request
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125 index_url = self._get_index_url(url)
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126 if index_url:
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127 # Split the credentials from the url.
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128 index_info = split_auth_netloc_from_url(index_url)
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129 if index_info:
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130 index_url, _, index_url_user_password = index_info
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131 logger.debug("Found index url %s", index_url)
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132
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133 # If an index URL was found, try its embedded credentials
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134 if index_url and index_url_user_password[0] is not None:
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135 username, password = index_url_user_password
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136 if username is not None and password is not None:
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137 logger.debug("Found credentials in index url for %s", netloc)
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138 return index_url_user_password
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139
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140 # Get creds from netrc if we still don't have them
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141 if allow_netrc:
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142 netrc_auth = get_netrc_auth(original_url)
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143 if netrc_auth:
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144 logger.debug("Found credentials in netrc for %s", netloc)
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145 return netrc_auth
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146
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147 # If we don't have a password and keyring is available, use it.
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148 if allow_keyring:
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149 # The index url is more specific than the netloc, so try it first
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150 kr_auth = (
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151 get_keyring_auth(index_url, username) or
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152 get_keyring_auth(netloc, username)
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153 )
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154 if kr_auth:
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155 logger.debug("Found credentials in keyring for %s", netloc)
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156 return kr_auth
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157
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158 return username, password
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159
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160 def _get_url_and_credentials(self, original_url):
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161 """Return the credentials to use for the provided URL.
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162
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163 If allowed, netrc and keyring may be used to obtain the
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164 correct credentials.
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165
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166 Returns (url_without_credentials, username, password). Note
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167 that even if the original URL contains credentials, this
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168 function may return a different username and password.
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169 """
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170 url, netloc, _ = split_auth_netloc_from_url(original_url)
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171
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172 # Use any stored credentials that we have for this netloc
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173 username, password = self.passwords.get(netloc, (None, None))
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174
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175 if username is None and password is None:
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176 # No stored credentials. Acquire new credentials without prompting
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177 # the user. (e.g. from netrc, keyring, or the URL itself)
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178 username, password = self._get_new_credentials(original_url)
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179
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180 if username is not None or password is not None:
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181 # Convert the username and password if they're None, so that
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182 # this netloc will show up as "cached" in the conditional above.
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183 # Further, HTTPBasicAuth doesn't accept None, so it makes sense to
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184 # cache the value that is going to be used.
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185 username = username or ""
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186 password = password or ""
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187
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188 # Store any acquired credentials.
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189 self.passwords[netloc] = (username, password)
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190
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191 assert (
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192 # Credentials were found
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193 (username is not None and password is not None) or
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194 # Credentials were not found
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195 (username is None and password is None)
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196 ), "Could not load credentials from url: {}".format(original_url)
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197
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198 return url, username, password
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199
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200 def __call__(self, req):
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201 # Get credentials for this request
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202 url, username, password = self._get_url_and_credentials(req.url)
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203
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204 # Set the url of the request to the url without any credentials
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205 req.url = url
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206
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207 if username is not None and password is not None:
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208 # Send the basic auth with this request
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209 req = HTTPBasicAuth(username, password)(req)
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210
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211 # Attach a hook to handle 401 responses
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212 req.register_hook("response", self.handle_401)
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213
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214 return req
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215
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216 # Factored out to allow for easy patching in tests
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217 def _prompt_for_password(self, netloc):
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218 username = ask_input("User for %s: " % netloc)
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219 if not username:
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220 return None, None
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221 auth = get_keyring_auth(netloc, username)
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222 if auth:
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223 return auth[0], auth[1], False
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224 password = ask_password("Password: ")
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225 return username, password, True
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226
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227 # Factored out to allow for easy patching in tests
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228 def _should_save_password_to_keyring(self):
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229 if not keyring:
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230 return False
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231 return ask("Save credentials to keyring [y/N]: ", ["y", "n"]) == "y"
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232
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233 def handle_401(self, resp, **kwargs):
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234 # We only care about 401 responses, anything else we want to just
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235 # pass through the actual response
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236 if resp.status_code != 401:
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237 return resp
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238
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239 # We are not able to prompt the user so simply return the response
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240 if not self.prompting:
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241 return resp
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242
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243 parsed = urllib_parse.urlparse(resp.url)
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244
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245 # Prompt the user for a new username and password
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246 username, password, save = self._prompt_for_password(parsed.netloc)
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247
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248 # Store the new username and password to use for future requests
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249 self._credentials_to_save = None
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250 if username is not None and password is not None:
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251 self.passwords[parsed.netloc] = (username, password)
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252
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253 # Prompt to save the password to keyring
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254 if save and self._should_save_password_to_keyring():
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255 self._credentials_to_save = (parsed.netloc, username, password)
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256
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257 # Consume content and release the original connection to allow our new
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258 # request to reuse the same one.
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259 resp.content
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260 resp.raw.release_conn()
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261
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262 # Add our new username and password to the request
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263 req = HTTPBasicAuth(username or "", password or "")(resp.request)
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guerler
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264 req.register_hook("response", self.warn_on_401)
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265
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266 # On successful request, save the credentials that were used to
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267 # keyring. (Note that if the user responded "no" above, this member
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guerler
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268 # is not set and nothing will be saved.)
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269 if self._credentials_to_save:
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270 req.register_hook("response", self.save_credentials)
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271
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272 # Send our new request
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273 new_resp = resp.connection.send(req, **kwargs)
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274 new_resp.history.append(resp)
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275
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276 return new_resp
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277
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278 def warn_on_401(self, resp, **kwargs):
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279 """Response callback to warn about incorrect credentials."""
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guerler
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280 if resp.status_code == 401:
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281 logger.warning(
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282 '401 Error, Credentials not correct for %s', resp.request.url,
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guerler
parents:
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283 )
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284
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285 def save_credentials(self, resp, **kwargs):
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286 """Response callback to save credentials on success."""
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guerler
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287 assert keyring is not None, "should never reach here without keyring"
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guerler
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288 if not keyring:
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289 return
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290
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291 creds = self._credentials_to_save
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guerler
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292 self._credentials_to_save = None
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guerler
parents:
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293 if creds and resp.status_code < 400:
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guerler
parents:
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294 try:
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295 logger.info('Saving credentials to keyring')
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296 keyring.set_password(*creds)
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guerler
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297 except Exception:
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298 logger.exception('Failed to save credentials')