Mercurial > hg
annotate mercurial/hgweb/request.py @ 48946:642e31cb55f0
py3: use class X: instead of class X(object):
The inheritance from object is implied in Python 3. So this should
be equivalent.
This change was generated via an automated search and replace. So there
may have been some accidental changes.
Differential Revision: https://phab.mercurial-scm.org/D12352
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 21 Feb 2022 13:08:28 -0700 |
parents | f254fc73d956 |
children | fda5a4b853ab |
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1 # hgweb/request.py - An http request from either CGI or the standalone server. |
131 | 2 # |
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3 # Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net> |
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4 # Copyright 2005, 2006 Olivia Mackall <olivia@selenic.com> |
131 | 5 # |
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6 # This software may be used and distributed according to the terms of the |
10263 | 7 # GNU General Public License version 2 or any later version. |
131 | 8 |
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9 |
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10 # import wsgiref.validate |
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11 |
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12 from ..thirdparty import attr |
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13 from .. import ( |
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14 encoding, |
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15 error, |
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16 pycompat, |
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17 util, |
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18 ) |
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19 from ..utils import ( |
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20 urlutil, |
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21 ) |
138 | 22 |
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23 |
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24 class multidict: |
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25 """A dict like object that can store multiple values for a key. |
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26 |
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27 Used to store parsed request parameters. |
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28 |
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29 This is inspired by WebOb's class of the same name. |
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30 """ |
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31 |
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32 def __init__(self): |
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33 self._items = {} |
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34 |
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35 def __getitem__(self, key): |
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36 """Returns the last set value for a key.""" |
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37 return self._items[key][-1] |
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38 |
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39 def __setitem__(self, key, value): |
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40 """Replace a values for a key with a new value.""" |
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41 self._items[key] = [value] |
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42 |
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43 def __delitem__(self, key): |
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44 """Delete all values for a key.""" |
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45 del self._items[key] |
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46 |
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47 def __contains__(self, key): |
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48 return key in self._items |
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49 |
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50 def __len__(self): |
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51 return len(self._items) |
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52 |
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53 def get(self, key, default=None): |
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54 try: |
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55 return self.__getitem__(key) |
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56 except KeyError: |
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57 return default |
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58 |
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59 def add(self, key, value): |
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60 """Add a new value for a key. Does not replace existing values.""" |
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61 self._items.setdefault(key, []).append(value) |
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62 |
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63 def getall(self, key): |
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64 """Obtains all values for a key.""" |
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65 return self._items.get(key, []) |
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66 |
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67 def getone(self, key): |
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68 """Obtain a single value for a key. |
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69 |
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70 Raises KeyError if key not defined or it has multiple values set. |
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71 """ |
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72 vals = self._items[key] |
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73 |
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74 if len(vals) > 1: |
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75 raise KeyError(b'multiple values for %r' % key) |
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76 |
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77 return vals[0] |
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78 |
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79 def asdictoflists(self): |
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80 return {k: list(v) for k, v in self._items.items()} |
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81 |
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82 |
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83 @attr.s(frozen=True) |
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84 class parsedrequest: |
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85 """Represents a parsed WSGI request. |
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86 |
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87 Contains both parsed parameters as well as a handle on the input stream. |
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88 """ |
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89 |
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90 # Request method. |
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91 method = attr.ib() |
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92 # Full URL for this request. |
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93 url = attr.ib() |
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94 # URL without any path components. Just <proto>://<host><port>. |
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95 baseurl = attr.ib() |
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96 # Advertised URL. Like ``url`` and ``baseurl`` but uses SERVER_NAME instead |
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97 # of HTTP: Host header for hostname. This is likely what clients used. |
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98 advertisedurl = attr.ib() |
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99 advertisedbaseurl = attr.ib() |
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100 # URL scheme (part before ``://``). e.g. ``http`` or ``https``. |
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101 urlscheme = attr.ib() |
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102 # Value of REMOTE_USER, if set, or None. |
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103 remoteuser = attr.ib() |
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104 # Value of REMOTE_HOST, if set, or None. |
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105 remotehost = attr.ib() |
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106 # Relative WSGI application path. If defined, will begin with a |
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107 # ``/``. |
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108 apppath = attr.ib() |
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109 # List of path parts to be used for dispatch. |
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110 dispatchparts = attr.ib() |
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111 # URL path component (no query string) used for dispatch. Can be |
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112 # ``None`` to signal no path component given to the request, an |
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113 # empty string to signal a request to the application's root URL, |
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114 # or a string not beginning with ``/`` containing the requested |
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115 # path under the application. |
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116 dispatchpath = attr.ib() |
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117 # The name of the repository being accessed. |
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118 reponame = attr.ib() |
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119 # Raw query string (part after "?" in URL). |
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120 querystring = attr.ib() |
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121 # multidict of query string parameters. |
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122 qsparams = attr.ib() |
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123 # wsgiref.headers.Headers instance. Operates like a dict with case |
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124 # insensitive keys. |
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125 headers = attr.ib() |
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126 # Request body input stream. |
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127 bodyfh = attr.ib() |
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128 # WSGI environment dict, unmodified. |
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129 rawenv = attr.ib() |
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130 |
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131 |
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132 def parserequestfromenv(env, reponame=None, altbaseurl=None, bodyfh=None): |
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133 """Parse URL components from environment variables. |
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134 |
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135 WSGI defines request attributes via environment variables. This function |
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136 parses the environment variables into a data structure. |
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137 |
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138 If ``reponame`` is defined, the leading path components matching that |
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139 string are effectively shifted from ``PATH_INFO`` to ``SCRIPT_NAME``. |
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140 This simulates the world view of a WSGI application that processes |
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141 requests from the base URL of a repo. |
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142 |
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143 If ``altbaseurl`` (typically comes from ``web.baseurl`` config option) |
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144 is defined, it is used - instead of the WSGI environment variables - for |
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145 constructing URL components up to and including the WSGI application path. |
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146 For example, if the current WSGI application is at ``/repo`` and a request |
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147 is made to ``/rev/@`` with this argument set to |
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148 ``http://myserver:9000/prefix``, the URL and path components will resolve as |
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149 if the request were to ``http://myserver:9000/prefix/rev/@``. In other |
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150 words, ``wsgi.url_scheme``, ``SERVER_NAME``, ``SERVER_PORT``, and |
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151 ``SCRIPT_NAME`` are all effectively replaced by components from this URL. |
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152 |
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153 ``bodyfh`` can be used to specify a file object to read the request body |
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154 from. If not defined, ``wsgi.input`` from the environment dict is used. |
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155 """ |
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156 # PEP 3333 defines the WSGI spec and is a useful reference for this code. |
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157 |
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158 # We first validate that the incoming object conforms with the WSGI spec. |
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159 # We only want to be dealing with spec-conforming WSGI implementations. |
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160 # TODO enable this once we fix internal violations. |
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161 # wsgiref.validate.check_environ(env) |
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162 |
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163 # PEP-0333 states that environment keys and values are native strings. |
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164 # The code points for the Unicode strings on Python 3 must be between |
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165 # \00000-\000FF. We deal with bytes in Mercurial, so mass convert string |
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166 # keys and values to bytes. |
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167 def tobytes(s): |
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168 if not isinstance(s, str): |
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169 return s |
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170 if pycompat.iswindows: |
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171 # This is what mercurial.encoding does for os.environ on |
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172 # Windows. |
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173 return encoding.strtolocal(s) |
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174 else: |
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175 # This is what is documented to be used for os.environ on Unix. |
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176 return pycompat.fsencode(s) |
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177 |
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178 env = {tobytes(k): tobytes(v) for k, v in env.items()} |
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179 |
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180 # Some hosting solutions are emulating hgwebdir, and dispatching directly |
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181 # to an hgweb instance using this environment variable. This was always |
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182 # checked prior to d7fd203e36cc; keep doing so to avoid breaking them. |
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183 if not reponame: |
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184 reponame = env.get(b'REPO_NAME') |
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185 |
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186 if altbaseurl: |
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187 altbaseurl = urlutil.url(altbaseurl) |
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188 |
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189 # https://www.python.org/dev/peps/pep-0333/#environ-variables defines |
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190 # the environment variables. |
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191 # https://www.python.org/dev/peps/pep-0333/#url-reconstruction defines |
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192 # how URLs are reconstructed. |
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193 fullurl = env[b'wsgi.url_scheme'] + b'://' |
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194 |
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195 if altbaseurl and altbaseurl.scheme: |
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196 advertisedfullurl = altbaseurl.scheme + b'://' |
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197 else: |
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198 advertisedfullurl = fullurl |
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199 |
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200 def addport(s, port): |
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201 if s.startswith(b'https://'): |
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202 if port != b'443': |
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203 s += b':' + port |
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204 else: |
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205 if port != b'80': |
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206 s += b':' + port |
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207 |
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208 return s |
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209 |
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210 if env.get(b'HTTP_HOST'): |
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211 fullurl += env[b'HTTP_HOST'] |
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212 else: |
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213 fullurl += env[b'SERVER_NAME'] |
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214 fullurl = addport(fullurl, env[b'SERVER_PORT']) |
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215 |
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216 if altbaseurl and altbaseurl.host: |
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217 advertisedfullurl += altbaseurl.host |
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218 |
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219 if altbaseurl.port: |
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220 port = altbaseurl.port |
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221 elif altbaseurl.scheme == b'http' and not altbaseurl.port: |
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222 port = b'80' |
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223 elif altbaseurl.scheme == b'https' and not altbaseurl.port: |
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224 port = b'443' |
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225 else: |
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226 port = env[b'SERVER_PORT'] |
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227 |
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228 advertisedfullurl = addport(advertisedfullurl, port) |
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229 else: |
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230 advertisedfullurl += env[b'SERVER_NAME'] |
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231 advertisedfullurl = addport(advertisedfullurl, env[b'SERVER_PORT']) |
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232 |
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233 baseurl = fullurl |
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234 advertisedbaseurl = advertisedfullurl |
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235 |
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236 fullurl += util.urlreq.quote(env.get(b'SCRIPT_NAME', b'')) |
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237 fullurl += util.urlreq.quote(env.get(b'PATH_INFO', b'')) |
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238 |
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239 if altbaseurl: |
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240 path = altbaseurl.path or b'' |
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241 if path and not path.startswith(b'/'): |
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242 path = b'/' + path |
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243 advertisedfullurl += util.urlreq.quote(path) |
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244 else: |
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245 advertisedfullurl += util.urlreq.quote(env.get(b'SCRIPT_NAME', b'')) |
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246 |
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247 advertisedfullurl += util.urlreq.quote(env.get(b'PATH_INFO', b'')) |
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248 |
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249 if env.get(b'QUERY_STRING'): |
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250 fullurl += b'?' + env[b'QUERY_STRING'] |
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251 advertisedfullurl += b'?' + env[b'QUERY_STRING'] |
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252 |
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253 # If ``reponame`` is defined, that must be a prefix on PATH_INFO |
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254 # that represents the repository being dispatched to. When computing |
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255 # the dispatch info, we ignore these leading path components. |
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256 |
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257 if altbaseurl: |
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258 apppath = altbaseurl.path or b'' |
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259 if apppath and not apppath.startswith(b'/'): |
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260 apppath = b'/' + apppath |
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261 else: |
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262 apppath = env.get(b'SCRIPT_NAME', b'') |
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263 |
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264 if reponame: |
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265 repoprefix = b'/' + reponame.strip(b'/') |
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266 |
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267 if not env.get(b'PATH_INFO'): |
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268 raise error.ProgrammingError(b'reponame requires PATH_INFO') |
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269 |
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270 if not env[b'PATH_INFO'].startswith(repoprefix): |
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271 raise error.ProgrammingError( |
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272 b'PATH_INFO does not begin with repo ' |
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273 b'name: %s (%s)' % (env[b'PATH_INFO'], reponame) |
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274 ) |
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275 |
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276 dispatchpath = env[b'PATH_INFO'][len(repoprefix) :] |
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277 |
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278 if dispatchpath and not dispatchpath.startswith(b'/'): |
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279 raise error.ProgrammingError( |
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280 b'reponame prefix of PATH_INFO does ' |
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281 b'not end at path delimiter: %s (%s)' |
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282 % (env[b'PATH_INFO'], reponame) |
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283 ) |
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284 |
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285 apppath = apppath.rstrip(b'/') + repoprefix |
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286 dispatchparts = dispatchpath.strip(b'/').split(b'/') |
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287 dispatchpath = b'/'.join(dispatchparts) |
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288 |
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289 elif b'PATH_INFO' in env: |
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290 if env[b'PATH_INFO'].strip(b'/'): |
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291 dispatchparts = env[b'PATH_INFO'].strip(b'/').split(b'/') |
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292 dispatchpath = b'/'.join(dispatchparts) |
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293 else: |
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294 dispatchparts = [] |
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295 dispatchpath = b'' |
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296 else: |
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297 dispatchparts = [] |
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298 dispatchpath = None |
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299 |
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300 querystring = env.get(b'QUERY_STRING', b'') |
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301 |
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302 # We store as a list so we have ordering information. We also store as |
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303 # a dict to facilitate fast lookup. |
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304 qsparams = multidict() |
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305 for k, v in util.urlreq.parseqsl(querystring, keep_blank_values=True): |
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306 qsparams.add(k, v) |
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307 |
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308 # HTTP_* keys contain HTTP request headers. The Headers structure should |
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309 # perform case normalization for us. We just rewrite underscore to dash |
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310 # so keys match what likely went over the wire. |
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311 headers = [] |
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312 for k, v in env.items(): |
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313 if k.startswith(b'HTTP_'): |
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314 headers.append((k[len(b'HTTP_') :].replace(b'_', b'-'), v)) |
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315 |
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316 from . import wsgiheaders # avoid cycle |
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317 |
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318 headers = wsgiheaders.Headers(headers) |
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319 |
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320 # This is kind of a lie because the HTTP header wasn't explicitly |
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321 # sent. But for all intents and purposes it should be OK to lie about |
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322 # this, since a consumer will either either value to determine how many |
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323 # bytes are available to read. |
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324 if b'CONTENT_LENGTH' in env and b'HTTP_CONTENT_LENGTH' not in env: |
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325 headers[b'Content-Length'] = env[b'CONTENT_LENGTH'] |
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326 |
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327 if b'CONTENT_TYPE' in env and b'HTTP_CONTENT_TYPE' not in env: |
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328 headers[b'Content-Type'] = env[b'CONTENT_TYPE'] |
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329 |
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330 if bodyfh is None: |
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331 bodyfh = env[b'wsgi.input'] |
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332 if b'Content-Length' in headers: |
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333 bodyfh = util.cappedreader( |
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334 bodyfh, int(headers[b'Content-Length'] or b'0') |
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335 ) |
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336 |
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337 return parsedrequest( |
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338 method=env[b'REQUEST_METHOD'], |
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339 url=fullurl, |
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340 baseurl=baseurl, |
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341 advertisedurl=advertisedfullurl, |
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342 advertisedbaseurl=advertisedbaseurl, |
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343 urlscheme=env[b'wsgi.url_scheme'], |
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344 remoteuser=env.get(b'REMOTE_USER'), |
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345 remotehost=env.get(b'REMOTE_HOST'), |
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346 apppath=apppath, |
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347 dispatchparts=dispatchparts, |
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348 dispatchpath=dispatchpath, |
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349 reponame=reponame, |
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350 querystring=querystring, |
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351 qsparams=qsparams, |
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352 headers=headers, |
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353 bodyfh=bodyfh, |
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354 rawenv=env, |
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355 ) |
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356 |
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357 |
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358 class offsettrackingwriter: |
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359 """A file object like object that is append only and tracks write count. |
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360 |
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361 Instances are bound to a callable. This callable is called with data |
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362 whenever a ``write()`` is attempted. |
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363 |
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364 Instances track the amount of written data so they can answer ``tell()`` |
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365 requests. |
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366 |
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367 The intent of this class is to wrap the ``write()`` function returned by |
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368 a WSGI ``start_response()`` function. Since ``write()`` is a callable and |
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369 not a file object, it doesn't implement other file object methods. |
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370 """ |
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371 |
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372 def __init__(self, writefn): |
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373 self._write = writefn |
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374 self._offset = 0 |
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375 |
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376 def write(self, s): |
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377 res = self._write(s) |
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378 # Some Python objects don't report the number of bytes written. |
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379 if res is None: |
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380 self._offset += len(s) |
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381 else: |
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382 self._offset += res |
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383 |
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384 def flush(self): |
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385 pass |
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386 |
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387 def tell(self): |
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388 return self._offset |
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389 |
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390 |
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391 class wsgiresponse: |
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392 """Represents a response to a WSGI request. |
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393 |
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394 A response consists of a status line, headers, and a body. |
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395 |
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396 Consumers must populate the ``status`` and ``headers`` fields and |
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397 make a call to a ``setbody*()`` method before the response can be |
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398 issued. |
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399 |
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400 When it is time to start sending the response over the wire, |
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401 ``sendresponse()`` is called. It handles emitting the header portion |
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402 of the response message. It then yields chunks of body data to be |
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403 written to the peer. Typically, the WSGI application itself calls |
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404 and returns the value from ``sendresponse()``. |
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405 """ |
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406 |
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407 def __init__(self, req, startresponse): |
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408 """Create an empty response tied to a specific request. |
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409 |
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410 ``req`` is a ``parsedrequest``. ``startresponse`` is the |
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411 ``start_response`` function passed to the WSGI application. |
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412 """ |
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413 self._req = req |
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414 self._startresponse = startresponse |
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415 |
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416 self.status = None |
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417 from . import wsgiheaders # avoid cycle |
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418 |
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419 self.headers = wsgiheaders.Headers([]) |
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420 |
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421 self._bodybytes = None |
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422 self._bodygen = None |
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423 self._bodywillwrite = False |
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424 self._started = False |
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425 self._bodywritefn = None |
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426 |
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427 def _verifybody(self): |
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428 if ( |
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429 self._bodybytes is not None |
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430 or self._bodygen is not None |
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431 or self._bodywillwrite |
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432 ): |
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433 raise error.ProgrammingError(b'cannot define body multiple times') |
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434 |
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435 def setbodybytes(self, b): |
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436 """Define the response body as static bytes. |
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437 |
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438 The empty string signals that there is no response body. |
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439 """ |
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440 self._verifybody() |
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441 self._bodybytes = b |
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442 self.headers[b'Content-Length'] = b'%d' % len(b) |
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443 |
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444 def setbodygen(self, gen): |
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445 """Define the response body as a generator of bytes.""" |
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446 self._verifybody() |
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447 self._bodygen = gen |
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448 |
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449 def setbodywillwrite(self): |
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450 """Signal an intent to use write() to emit the response body. |
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451 |
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452 **This is the least preferred way to send a body.** |
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453 |
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454 It is preferred for WSGI applications to emit a generator of chunks |
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455 constituting the response body. However, some consumers can't emit |
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456 data this way. So, WSGI provides a way to obtain a ``write(data)`` |
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457 function that can be used to synchronously perform an unbuffered |
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458 write. |
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459 |
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460 Calling this function signals an intent to produce the body in this |
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461 manner. |
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462 """ |
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463 self._verifybody() |
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464 self._bodywillwrite = True |
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465 |
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466 def sendresponse(self): |
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467 """Send the generated response to the client. |
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468 |
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469 Before this is called, ``status`` must be set and one of |
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470 ``setbodybytes()`` or ``setbodygen()`` must be called. |
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471 |
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472 Calling this method multiple times is not allowed. |
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473 """ |
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474 if self._started: |
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475 raise error.ProgrammingError( |
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476 b'sendresponse() called multiple times' |
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477 ) |
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478 |
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479 self._started = True |
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480 |
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481 if not self.status: |
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482 raise error.ProgrammingError(b'status line not defined') |
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483 |
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484 if ( |
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485 self._bodybytes is None |
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486 and self._bodygen is None |
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487 and not self._bodywillwrite |
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488 ): |
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489 raise error.ProgrammingError(b'response body not defined') |
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490 |
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491 # RFC 7232 Section 4.1 states that a 304 MUST generate one of |
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492 # {Cache-Control, Content-Location, Date, ETag, Expires, Vary} |
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493 # and SHOULD NOT generate other headers unless they could be used |
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494 # to guide cache updates. Furthermore, RFC 7230 Section 3.3.2 |
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495 # states that no response body can be issued. Content-Length can |
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496 # be sent. But if it is present, it should be the size of the response |
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497 # that wasn't transferred. |
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498 if self.status.startswith(b'304 '): |
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499 # setbodybytes('') will set C-L to 0. This doesn't conform with the |
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500 # spec. So remove it. |
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501 if self.headers.get(b'Content-Length') == b'0': |
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502 del self.headers[b'Content-Length'] |
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503 |
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504 # Strictly speaking, this is too strict. But until it causes |
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505 # problems, let's be strict. |
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506 badheaders = { |
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507 k |
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508 for k in self.headers.keys() |
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509 if k.lower() |
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510 not in ( |
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511 b'date', |
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512 b'etag', |
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513 b'expires', |
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514 b'cache-control', |
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515 b'content-location', |
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516 b'content-security-policy', |
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517 b'vary', |
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518 ) |
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519 } |
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520 if badheaders: |
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521 raise error.ProgrammingError( |
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522 b'illegal header on 304 response: %s' |
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523 % b', '.join(sorted(badheaders)) |
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524 ) |
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525 |
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526 if self._bodygen is not None or self._bodywillwrite: |
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527 raise error.ProgrammingError( |
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528 b"must use setbodybytes('') with 304 responses" |
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529 ) |
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530 |
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531 # Various HTTP clients (notably httplib) won't read the HTTP response |
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532 # until the HTTP request has been sent in full. If servers (us) send a |
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533 # response before the HTTP request has been fully sent, the connection |
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534 # may deadlock because neither end is reading. |
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535 # |
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536 # We work around this by "draining" the request data before |
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537 # sending any response in some conditions. |
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538 drain = False |
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539 close = False |
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540 |
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541 # If the client sent Expect: 100-continue, we assume it is smart enough |
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542 # to deal with the server sending a response before reading the request. |
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543 # (httplib doesn't do this.) |
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544 if self._req.headers.get(b'Expect', b'').lower() == b'100-continue': |
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545 pass |
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546 # Only tend to request methods that have bodies. Strictly speaking, |
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547 # we should sniff for a body. But this is fine for our existing |
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548 # WSGI applications. |
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549 elif self._req.method not in (b'POST', b'PUT'): |
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550 pass |
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551 else: |
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552 # If we don't know how much data to read, there's no guarantee |
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553 # that we can drain the request responsibly. The WSGI |
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554 # specification only says that servers *should* ensure the |
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555 # input stream doesn't overrun the actual request. So there's |
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556 # no guarantee that reading until EOF won't corrupt the stream |
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557 # state. |
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558 if not isinstance(self._req.bodyfh, util.cappedreader): |
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559 close = True |
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560 else: |
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561 # We /could/ only drain certain HTTP response codes. But 200 and |
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562 # non-200 wire protocol responses both require draining. Since |
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563 # we have a capped reader in place for all situations where we |
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564 # drain, it is safe to read from that stream. We'll either do |
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565 # a drain or no-op if we're already at EOF. |
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566 drain = True |
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567 |
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568 if close: |
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569 self.headers[b'Connection'] = b'Close' |
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570 |
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571 if drain: |
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572 assert isinstance(self._req.bodyfh, util.cappedreader) |
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573 while True: |
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574 chunk = self._req.bodyfh.read(32768) |
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575 if not chunk: |
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576 break |
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577 |
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578 strheaders = [ |
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579 (pycompat.strurl(k), pycompat.strurl(v)) |
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580 for k, v in self.headers.items() |
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581 ] |
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582 write = self._startresponse(pycompat.sysstr(self.status), strheaders) |
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583 |
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584 if self._bodybytes: |
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585 yield self._bodybytes |
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586 elif self._bodygen: |
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587 for chunk in self._bodygen: |
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588 # PEP-3333 says that output must be bytes. And some WSGI |
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589 # implementations enforce this. We cast bytes-like types here |
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590 # for convenience. |
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591 if isinstance(chunk, bytearray): |
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592 chunk = bytes(chunk) |
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593 |
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594 yield chunk |
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595 elif self._bodywillwrite: |
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596 self._bodywritefn = write |
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597 else: |
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598 error.ProgrammingError(b'do not know how to send body') |
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599 |
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600 def getbodyfile(self): |
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601 """Obtain a file object like object representing the response body. |
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602 |
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603 For this to work, you must call ``setbodywillwrite()`` and then |
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604 ``sendresponse()`` first. ``sendresponse()`` is a generator and the |
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605 function won't run to completion unless the generator is advanced. The |
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606 generator yields not items. The easiest way to consume it is with |
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607 ``list(res.sendresponse())``, which should resolve to an empty list - |
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608 ``[]``. |
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609 """ |
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610 if not self._bodywillwrite: |
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611 raise error.ProgrammingError(b'must call setbodywillwrite() first') |
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612 |
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613 if not self._started: |
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614 raise error.ProgrammingError( |
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615 b'must call sendresponse() first; did ' |
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616 b'you remember to consume it since it ' |
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617 b'is a generator?' |
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618 ) |
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619 |
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620 assert self._bodywritefn |
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621 return offsettrackingwriter(self._bodywritefn) |
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622 |
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623 |
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624 def wsgiapplication(app_maker): |
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625 """For compatibility with old CGI scripts. A plain hgweb() or hgwebdir() |
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626 can and should now be used as a WSGI application.""" |
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627 application = app_maker() |
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628 |
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629 def run_wsgi(env, respond): |
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630 return application(env, respond) |
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631 |
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632 return run_wsgi |