Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/routes/middleware.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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0
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1 """Routes WSGI Middleware"""
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2 import re
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3 import logging
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4
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5 from webob import Request
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6
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7 from routes.base import request_config
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8 from routes.util import URLGenerator
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9
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10 log = logging.getLogger('routes.middleware')
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11
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12
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13 class RoutesMiddleware(object):
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14 """Routing middleware that handles resolving the PATH_INFO in
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15 addition to optionally recognizing method overriding.
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16
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17 .. Note::
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18 This module requires webob to be installed. To depend on it, you may
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19 list routes[middleware] in your ``requirements.txt``
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20 """
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21 def __init__(self, wsgi_app, mapper, use_method_override=True,
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22 path_info=True, singleton=True):
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23 """Create a Route middleware object
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24
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25 Using the use_method_override keyword will require Paste to be
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26 installed, and your application should use Paste's WSGIRequest
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27 object as it will properly handle POST issues with wsgi.input
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28 should Routes check it.
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29
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30 If path_info is True, then should a route var contain
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31 path_info, the SCRIPT_NAME and PATH_INFO will be altered
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32 accordingly. This should be used with routes like:
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33
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34 .. code-block:: python
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35
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36 map.connect('blog/*path_info', controller='blog', path_info='')
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37
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38 """
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39 self.app = wsgi_app
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40 self.mapper = mapper
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41 self.singleton = singleton
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42 self.use_method_override = use_method_override
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43 self.path_info = path_info
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44 self.log_debug = logging.DEBUG >= log.getEffectiveLevel()
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45 if self.log_debug:
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46 log.debug("Initialized with method overriding = %s, and path "
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47 "info altering = %s", use_method_override, path_info)
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48
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49 def __call__(self, environ, start_response):
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50 """Resolves the URL in PATH_INFO, and uses wsgi.routing_args
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51 to pass on URL resolver results."""
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52 old_method = None
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53 if self.use_method_override:
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54 req = None
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55
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56 # In some odd cases, there's no query string
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57 try:
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58 qs = environ['QUERY_STRING']
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59 except KeyError:
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60 qs = ''
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61 if '_method' in qs:
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62 req = Request(environ)
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63 req.errors = 'ignore'
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64
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65 try:
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66 method = req.GET.get('_method')
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67 except UnicodeDecodeError:
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68 method = None
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69
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70 if method:
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71 old_method = environ['REQUEST_METHOD']
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72 environ['REQUEST_METHOD'] = method.upper()
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73 if self.log_debug:
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74 log.debug("_method found in QUERY_STRING, altering "
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75 "request method to %s",
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76 environ['REQUEST_METHOD'])
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77 elif environ['REQUEST_METHOD'] == 'POST' and is_form_post(environ):
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78 if req is None:
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79 req = Request(environ)
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80 req.errors = 'ignore'
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81
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82 try:
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83 method = req.POST.get('_method')
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84 except UnicodeDecodeError:
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85 method = None
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86
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87 if method:
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88 old_method = environ['REQUEST_METHOD']
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89 environ['REQUEST_METHOD'] = method.upper()
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90 if self.log_debug:
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91 log.debug("_method found in POST data, altering "
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92 "request method to %s",
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93 environ['REQUEST_METHOD'])
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94
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95 # Run the actual route matching
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96 # -- Assignment of environ to config triggers route matching
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97 if self.singleton:
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98 config = request_config()
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99 config.mapper = self.mapper
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100 config.environ = environ
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101 match = config.mapper_dict
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102 route = config.route
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103 else:
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104 results = self.mapper.routematch(environ=environ)
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105 if results:
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106 match, route = results[0], results[1]
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107 else:
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108 match = route = None
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109
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110 if old_method:
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111 environ['REQUEST_METHOD'] = old_method
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112
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113 if not match:
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114 match = {}
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115 if self.log_debug:
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116 urlinfo = "%s %s" % (environ['REQUEST_METHOD'],
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117 environ['PATH_INFO'])
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118 log.debug("No route matched for %s", urlinfo)
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119 elif self.log_debug:
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120 urlinfo = "%s %s" % (environ['REQUEST_METHOD'],
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121 environ['PATH_INFO'])
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122 log.debug("Matched %s", urlinfo)
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123 log.debug("Route path: '%s', defaults: %s", route.routepath,
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124 route.defaults)
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125 log.debug("Match dict: %s", match)
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126
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127 url = URLGenerator(self.mapper, environ)
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128 environ['wsgiorg.routing_args'] = ((url), match)
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129 environ['routes.route'] = route
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130 environ['routes.url'] = url
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131
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132 if route and route.redirect:
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133 route_name = '_redirect_%s' % id(route)
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134 location = url(route_name, **match)
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135 log.debug("Using redirect route, redirect to '%s' with status"
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136 "code: %s", location, route.redirect_status)
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137 start_response(route.redirect_status,
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138 [('Content-Type', 'text/plain; charset=utf8'),
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139 ('Location', location)])
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140 return []
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141
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142 # If the route included a path_info attribute and it should be used to
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143 # alter the environ, we'll pull it out
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144 if self.path_info and 'path_info' in match:
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145 oldpath = environ['PATH_INFO']
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146 newpath = match.get('path_info') or ''
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147 environ['PATH_INFO'] = newpath
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148 if not environ['PATH_INFO'].startswith('/'):
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149 environ['PATH_INFO'] = '/' + environ['PATH_INFO']
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150 environ['SCRIPT_NAME'] += re.sub(
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151 r'^(.*?)/' + re.escape(newpath) + '$', r'\1', oldpath)
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152
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153 response = self.app(environ, start_response)
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154
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155 # Wrapped in try as in rare cases the attribute will be gone already
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156 try:
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157 del self.mapper.environ
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158 except AttributeError:
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159 pass
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160 return response
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161
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162
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163 def is_form_post(environ):
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164 """Determine whether the request is a POSTed html form"""
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165 content_type = environ.get('CONTENT_TYPE', '').lower()
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166 if ';' in content_type:
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167 content_type = content_type.split(';', 1)[0]
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168 return content_type in ('application/x-www-form-urlencoded',
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169 'multipart/form-data')