1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
"""Miscellaneous WSGI-related Utilities"""
import posixpath
__all__ = [
'FileWrapper', 'guess_scheme', 'application_uri', 'request_uri',
'shift_path_info', 'setup_testing_defaults',
]
class FileWrapper:
"""Wrapper to convert file-like objects to iterables"""
def __init__(self, filelike, blksize=8192):
self.filelike = filelike
self.blksize = blksize
if hasattr(filelike,'close'):
self.close = filelike.close
def __getitem__(self,key):
data = self.filelike.read(self.blksize)
if data:
return data
raise IndexError
def __iter__(self):
return self
def __next__(self):
data = self.filelike.read(self.blksize)
if data:
return data
raise StopIteration
def guess_scheme(environ):
"""Return a guess for whether 'wsgi.url_scheme' should be 'http' or 'https'
"""
if environ.get("HTTPS") in ('yes','on','1'):
return 'https'
else:
return 'http'
def application_uri(environ):
"""Return the application's base URI (no PATH_INFO or QUERY_STRING)"""
url = environ['wsgi.url_scheme']+'://'
from urllib.parse import quote
if environ.get('HTTP_HOST'):
url += environ['HTTP_HOST']
else:
url += environ['SERVER_NAME']
if environ['wsgi.url_scheme'] == 'https':
if environ['SERVER_PORT'] != '443':
url += ':' + environ['SERVER_PORT']
else:
if environ['SERVER_PORT'] != '80':
url += ':' + environ['SERVER_PORT']
url += quote(environ.get('SCRIPT_NAME') or '/')
return url
def request_uri(environ, include_query=True):
"""Return the full request URI, optionally including the query string"""
url = application_uri(environ)
from urllib.parse import quote
path_info = quote(environ.get('PATH_INFO',''))
if not environ.get('SCRIPT_NAME'):
url += path_info[1:]
else:
url += path_info
if include_query and environ.get('QUERY_STRING'):
url += '?' + environ['QUERY_STRING']
return url
def shift_path_info(environ):
"""Shift a name from PATH_INFO to SCRIPT_NAME, returning it
If there are no remaining path segments in PATH_INFO, return None.
Note: 'environ' is modified in-place; use a copy if you need to keep
the original PATH_INFO or SCRIPT_NAME.
Note: when PATH_INFO is just a '/', this returns '' and appends a trailing
'/' to SCRIPT_NAME, even though empty path segments are normally ignored,
and SCRIPT_NAME doesn't normally end in a '/'. This is intentional
behavior, to ensure that an application can tell the difference between
'/x' and '/x/' when traversing to objects.
"""
path_info = environ.get('PATH_INFO','')
if not path_info:
return None
path_parts = path_info.split('/')
path_parts[1:-1] = [p for p in path_parts[1:-1] if p and p != '.']
name = path_parts[1]
del path_parts[1]
script_name = environ.get('SCRIPT_NAME','')
script_name = posixpath.normpath(script_name+'/'+name)
if script_name.endswith('/'):
script_name = script_name[:-1]
if not name and not script_name.endswith('/'):
script_name += '/'
environ['SCRIPT_NAME'] = script_name
environ['PATH_INFO'] = '/'.join(path_parts)
# Special case: '/.' on PATH_INFO doesn't get stripped,
# because we don't strip the last element of PATH_INFO
# if there's only one path part left. Instead of fixing this
# above, we fix it here so that PATH_INFO gets normalized to
# an empty string in the environ.
if name=='.':
name = None
return name
def setup_testing_defaults(environ):
"""Update 'environ' with trivial defaults for testing purposes
This adds various parameters required for WSGI, including HTTP_HOST,
SERVER_NAME, SERVER_PORT, REQUEST_METHOD, SCRIPT_NAME, PATH_INFO,
and all of the wsgi.* variables. It only supplies default values,
and does not replace any existing settings for these variables.
This routine is intended to make it easier for unit tests of WSGI
servers and applications to set up dummy environments. It should *not*
be used by actual WSGI servers or applications, since the data is fake!
"""
environ.setdefault('SERVER_NAME','127.0.0.1')
environ.setdefault('SERVER_PROTOCOL','HTTP/1.0')
environ.setdefault('HTTP_HOST',environ['SERVER_NAME'])
environ.setdefault('REQUEST_METHOD','GET')
if 'SCRIPT_NAME' not in environ and 'PATH_INFO' not in environ:
environ.setdefault('SCRIPT_NAME','')
environ.setdefault('PATH_INFO','/')
environ.setdefault('wsgi.version', (1,0))
environ.setdefault('wsgi.run_once', 0)
environ.setdefault('wsgi.multithread', 0)
environ.setdefault('wsgi.multiprocess', 0)
from io import StringIO, BytesIO
environ.setdefault('wsgi.input', BytesIO())
environ.setdefault('wsgi.errors', StringIO())
environ.setdefault('wsgi.url_scheme',guess_scheme(environ))
if environ['wsgi.url_scheme']=='http':
environ.setdefault('SERVER_PORT', '80')
elif environ['wsgi.url_scheme']=='https':
environ.setdefault('SERVER_PORT', '443')
_hoppish = {
'connection':1, 'keep-alive':1, 'proxy-authenticate':1,
'proxy-authorization':1, 'te':1, 'trailers':1, 'transfer-encoding':1,
'upgrade':1
}.__contains__
def is_hop_by_hop(header_name):
"""Return true if 'header_name' is an HTTP/1.1 "Hop-by-Hop" header"""
return _hoppish(header_name.lower())
|
