1 """Miscellaneous WSGI-related Utilities"""
6 'FileWrapper', 'guess_scheme', 'application_uri', 'request_uri',
7 'shift_path_info', 'setup_testing_defaults',
12 """Wrapper to convert file-like objects to iterables"""
14 def __init__(self, filelike, blksize=8192):
15 self.filelike = filelike
16 self.blksize = blksize
17 if hasattr(filelike,'close'):
18 self.close = filelike.close
20 def __getitem__(self,key):
21 data = self.filelike.read(self.blksize)
30 data = self.filelike.read(self.blksize)
35 def guess_scheme(environ):
36 """Return a guess for whether 'wsgi.url_scheme' should be 'http' or 'https'
38 if environ.get("HTTPS") in ('yes','on','1'):
43 def application_uri(environ):
44 """Return the application's base URI (no PATH_INFO or QUERY_STRING)"""
45 url = environ['wsgi.url_scheme']+'://'
46 from urllib import quote
48 if environ.get('HTTP_HOST'):
49 url += environ['HTTP_HOST']
51 url += environ['SERVER_NAME']
53 if environ['wsgi.url_scheme'] == 'https':
54 if environ['SERVER_PORT'] != '443':
55 url += ':' + environ['SERVER_PORT']
57 if environ['SERVER_PORT'] != '80':
58 url += ':' + environ['SERVER_PORT']
60 url += quote(environ.get('SCRIPT_NAME') or '/')
63 def request_uri(environ, include_query=1):
64 """Return the full request URI, optionally including the query string"""
65 url = application_uri(environ)
66 from urllib import quote
67 path_info = quote(environ.get('PATH_INFO',''),safe='/;=,')
68 if not environ.get('SCRIPT_NAME'):
72 if include_query and environ.get('QUERY_STRING'):
73 url += '?' + environ['QUERY_STRING']
76 def shift_path_info(environ):
77 """Shift a name from PATH_INFO to SCRIPT_NAME, returning it
79 If there are no remaining path segments in PATH_INFO, return None.
80 Note: 'environ' is modified in-place; use a copy if you need to keep
81 the original PATH_INFO or SCRIPT_NAME.
83 Note: when PATH_INFO is just a '/', this returns '' and appends a trailing
84 '/' to SCRIPT_NAME, even though empty path segments are normally ignored,
85 and SCRIPT_NAME doesn't normally end in a '/'. This is intentional
86 behavior, to ensure that an application can tell the difference between
87 '/x' and '/x/' when traversing to objects.
89 path_info = environ.get('PATH_INFO','')
93 path_parts = path_info.split('/')
94 path_parts[1:-1] = [p for p in path_parts[1:-1] if p and p != '.']
98 script_name = environ.get('SCRIPT_NAME','')
99 script_name = posixpath.normpath(script_name+'/'+name)
100 if script_name.endswith('/'):
101 script_name = script_name[:-1]
102 if not name and not script_name.endswith('/'):
105 environ['SCRIPT_NAME'] = script_name
106 environ['PATH_INFO'] = '/'.join(path_parts)
108 # Special case: '/.' on PATH_INFO doesn't get stripped,
109 # because we don't strip the last element of PATH_INFO
110 # if there's only one path part left. Instead of fixing this
111 # above, we fix it here so that PATH_INFO gets normalized to
112 # an empty string in the environ.
117 def setup_testing_defaults(environ):
118 """Update 'environ' with trivial defaults for testing purposes
120 This adds various parameters required for WSGI, including HTTP_HOST,
121 SERVER_NAME, SERVER_PORT, REQUEST_METHOD, SCRIPT_NAME, PATH_INFO,
122 and all of the wsgi.* variables. It only supplies default values,
123 and does not replace any existing settings for these variables.
125 This routine is intended to make it easier for unit tests of WSGI
126 servers and applications to set up dummy environments. It should *not*
127 be used by actual WSGI servers or applications, since the data is fake!
130 environ.setdefault('SERVER_NAME','127.0.0.1')
131 environ.setdefault('SERVER_PROTOCOL','HTTP/1.0')
133 environ.setdefault('HTTP_HOST',environ['SERVER_NAME'])
134 environ.setdefault('REQUEST_METHOD','GET')
136 if 'SCRIPT_NAME' not in environ and 'PATH_INFO' not in environ:
137 environ.setdefault('SCRIPT_NAME','')
138 environ.setdefault('PATH_INFO','/')
140 environ.setdefault('wsgi.version', (1,0))
141 environ.setdefault('wsgi.run_once', 0)
142 environ.setdefault('wsgi.multithread', 0)
143 environ.setdefault('wsgi.multiprocess', 0)
145 from StringIO import StringIO
146 environ.setdefault('wsgi.input', StringIO(""))
147 environ.setdefault('wsgi.errors', StringIO())
148 environ.setdefault('wsgi.url_scheme',guess_scheme(environ))
150 if environ['wsgi.url_scheme']=='http':
151 environ.setdefault('SERVER_PORT', '80')
152 elif environ['wsgi.url_scheme']=='https':
153 environ.setdefault('SERVER_PORT', '443')
158 'connection':1, 'keep-alive':1, 'proxy-authenticate':1,
159 'proxy-authorization':1, 'te':1, 'trailers':1, 'transfer-encoding':1,
163 def is_hop_by_hop(header_name):
164 """Return true if 'header_name' is an HTTP/1.1 "Hop-by-Hop" header"""
165 return _hoppish(header_name.lower())