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Source.Python/addons/source-python/Python3/wsgiref/util.py at Data-Update · srpg/Source.Python · GitHub
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util.py
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"""Miscellaneous WSGI-related Utilities"""
import
posixpath
__all__
=
[
'FileWrapper'
,
'guess_scheme'
,
'application_uri'
,
'request_uri'
,
'shift_path_info'
,
'setup_testing_defaults'
,
'is_hop_by_hop'
,
]
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
__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
'/'
,
encoding
=
'latin1'
)
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'
,
''
),
safe
=
'/;=,'
,
encoding
=
'latin1'
)
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'
,
'keep-alive'
,
'proxy-authenticate'
,
'proxy-authorization'
,
'te'
,
'trailers'
,
'transfer-encoding'
,
'upgrade'
}.
__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
())
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