mirror of
https://github.com/Tygs/0bin.git
synced 2023-08-10 21:13:00 +03:00
Dependancy free
This commit is contained in:
sam
388
libs/cherrypy/lib/encoding.py
Normal file
388
libs/cherrypy/lib/encoding.py
Normal file
@ -0,0 +1,388 @@
|
||||
import struct
|
||||
import time
|
||||
|
||||
import cherrypy
|
||||
from cherrypy._cpcompat import basestring, BytesIO, ntob, set, unicodestr
|
||||
from cherrypy.lib import file_generator
|
||||
from cherrypy.lib import set_vary_header
|
||||
|
||||
|
||||
def decode(encoding=None, default_encoding='utf-8'):
|
||||
"""Replace or extend the list of charsets used to decode a request entity.
|
||||
|
||||
Either argument may be a single string or a list of strings.
|
||||
|
||||
encoding
|
||||
If not None, restricts the set of charsets attempted while decoding
|
||||
a request entity to the given set (even if a different charset is given in
|
||||
the Content-Type request header).
|
||||
|
||||
default_encoding
|
||||
Only in effect if the 'encoding' argument is not given.
|
||||
If given, the set of charsets attempted while decoding a request entity is
|
||||
*extended* with the given value(s).
|
||||
|
||||
"""
|
||||
body = cherrypy.request.body
|
||||
if encoding is not None:
|
||||
if not isinstance(encoding, list):
|
||||
encoding = [encoding]
|
||||
body.attempt_charsets = encoding
|
||||
elif default_encoding:
|
||||
if not isinstance(default_encoding, list):
|
||||
default_encoding = [default_encoding]
|
||||
body.attempt_charsets = body.attempt_charsets + default_encoding
|
||||
|
||||
|
||||
class ResponseEncoder:
|
||||
|
||||
default_encoding = 'utf-8'
|
||||
failmsg = "Response body could not be encoded with %r."
|
||||
encoding = None
|
||||
errors = 'strict'
|
||||
text_only = True
|
||||
add_charset = True
|
||||
debug = False
|
||||
|
||||
def __init__(self, **kwargs):
|
||||
for k, v in kwargs.items():
|
||||
setattr(self, k, v)
|
||||
|
||||
self.attempted_charsets = set()
|
||||
request = cherrypy.serving.request
|
||||
if request.handler is not None:
|
||||
# Replace request.handler with self
|
||||
if self.debug:
|
||||
cherrypy.log('Replacing request.handler', 'TOOLS.ENCODE')
|
||||
self.oldhandler = request.handler
|
||||
request.handler = self
|
||||
|
||||
def encode_stream(self, encoding):
|
||||
"""Encode a streaming response body.
|
||||
|
||||
Use a generator wrapper, and just pray it works as the stream is
|
||||
being written out.
|
||||
"""
|
||||
if encoding in self.attempted_charsets:
|
||||
return False
|
||||
self.attempted_charsets.add(encoding)
|
||||
|
||||
def encoder(body):
|
||||
for chunk in body:
|
||||
if isinstance(chunk, unicodestr):
|
||||
chunk = chunk.encode(encoding, self.errors)
|
||||
yield chunk
|
||||
self.body = encoder(self.body)
|
||||
return True
|
||||
|
||||
def encode_string(self, encoding):
|
||||
"""Encode a buffered response body."""
|
||||
if encoding in self.attempted_charsets:
|
||||
return False
|
||||
self.attempted_charsets.add(encoding)
|
||||
|
||||
try:
|
||||
body = []
|
||||
for chunk in self.body:
|
||||
if isinstance(chunk, unicodestr):
|
||||
chunk = chunk.encode(encoding, self.errors)
|
||||
body.append(chunk)
|
||||
self.body = body
|
||||
except (LookupError, UnicodeError):
|
||||
return False
|
||||
else:
|
||||
return True
|
||||
|
||||
def find_acceptable_charset(self):
|
||||
request = cherrypy.serving.request
|
||||
response = cherrypy.serving.response
|
||||
|
||||
if self.debug:
|
||||
cherrypy.log('response.stream %r' % response.stream, 'TOOLS.ENCODE')
|
||||
if response.stream:
|
||||
encoder = self.encode_stream
|
||||
else:
|
||||
encoder = self.encode_string
|
||||
if "Content-Length" in response.headers:
|
||||
# Delete Content-Length header so finalize() recalcs it.
|
||||
# Encoded strings may be of different lengths from their
|
||||
# unicode equivalents, and even from each other. For example:
|
||||
# >>> t = u"\u7007\u3040"
|
||||
# >>> len(t)
|
||||
# 2
|
||||
# >>> len(t.encode("UTF-8"))
|
||||
# 6
|
||||
# >>> len(t.encode("utf7"))
|
||||
# 8
|
||||
del response.headers["Content-Length"]
|
||||
|
||||
# Parse the Accept-Charset request header, and try to provide one
|
||||
# of the requested charsets (in order of user preference).
|
||||
encs = request.headers.elements('Accept-Charset')
|
||||
charsets = [enc.value.lower() for enc in encs]
|
||||
if self.debug:
|
||||
cherrypy.log('charsets %s' % repr(charsets), 'TOOLS.ENCODE')
|
||||
|
||||
if self.encoding is not None:
|
||||
# If specified, force this encoding to be used, or fail.
|
||||
encoding = self.encoding.lower()
|
||||
if self.debug:
|
||||
cherrypy.log('Specified encoding %r' % encoding, 'TOOLS.ENCODE')
|
||||
if (not charsets) or "*" in charsets or encoding in charsets:
|
||||
if self.debug:
|
||||
cherrypy.log('Attempting encoding %r' % encoding, 'TOOLS.ENCODE')
|
||||
if encoder(encoding):
|
||||
return encoding
|
||||
else:
|
||||
if not encs:
|
||||
if self.debug:
|
||||
cherrypy.log('Attempting default encoding %r' %
|
||||
self.default_encoding, 'TOOLS.ENCODE')
|
||||
# Any character-set is acceptable.
|
||||
if encoder(self.default_encoding):
|
||||
return self.default_encoding
|
||||
else:
|
||||
raise cherrypy.HTTPError(500, self.failmsg % self.default_encoding)
|
||||
else:
|
||||
for element in encs:
|
||||
if element.qvalue > 0:
|
||||
if element.value == "*":
|
||||
# Matches any charset. Try our default.
|
||||
if self.debug:
|
||||
cherrypy.log('Attempting default encoding due '
|
||||
'to %r' % element, 'TOOLS.ENCODE')
|
||||
if encoder(self.default_encoding):
|
||||
return self.default_encoding
|
||||
else:
|
||||
encoding = element.value
|
||||
if self.debug:
|
||||
cherrypy.log('Attempting encoding %s (qvalue >'
|
||||
'0)' % element, 'TOOLS.ENCODE')
|
||||
if encoder(encoding):
|
||||
return encoding
|
||||
|
||||
if "*" not in charsets:
|
||||
# If no "*" is present in an Accept-Charset field, then all
|
||||
# character sets not explicitly mentioned get a quality
|
||||
# value of 0, except for ISO-8859-1, which gets a quality
|
||||
# value of 1 if not explicitly mentioned.
|
||||
iso = 'iso-8859-1'
|
||||
if iso not in charsets:
|
||||
if self.debug:
|
||||
cherrypy.log('Attempting ISO-8859-1 encoding',
|
||||
'TOOLS.ENCODE')
|
||||
if encoder(iso):
|
||||
return iso
|
||||
|
||||
# No suitable encoding found.
|
||||
ac = request.headers.get('Accept-Charset')
|
||||
if ac is None:
|
||||
msg = "Your client did not send an Accept-Charset header."
|
||||
else:
|
||||
msg = "Your client sent this Accept-Charset header: %s." % ac
|
||||
msg += " We tried these charsets: %s." % ", ".join(self.attempted_charsets)
|
||||
raise cherrypy.HTTPError(406, msg)
|
||||
|
||||
def __call__(self, *args, **kwargs):
|
||||
response = cherrypy.serving.response
|
||||
self.body = self.oldhandler(*args, **kwargs)
|
||||
|
||||
if isinstance(self.body, basestring):
|
||||
# strings get wrapped in a list because iterating over a single
|
||||
# item list is much faster than iterating over every character
|
||||
# in a long string.
|
||||
if self.body:
|
||||
self.body = [self.body]
|
||||
else:
|
||||
# [''] doesn't evaluate to False, so replace it with [].
|
||||
self.body = []
|
||||
elif hasattr(self.body, 'read'):
|
||||
self.body = file_generator(self.body)
|
||||
elif self.body is None:
|
||||
self.body = []
|
||||
|
||||
ct = response.headers.elements("Content-Type")
|
||||
if self.debug:
|
||||
cherrypy.log('Content-Type: %r' % [str(h) for h in ct], 'TOOLS.ENCODE')
|
||||
if ct:
|
||||
ct = ct[0]
|
||||
if self.text_only:
|
||||
if ct.value.lower().startswith("text/"):
|
||||
if self.debug:
|
||||
cherrypy.log('Content-Type %s starts with "text/"' % ct,
|
||||
'TOOLS.ENCODE')
|
||||
do_find = True
|
||||
else:
|
||||
if self.debug:
|
||||
cherrypy.log('Not finding because Content-Type %s does '
|
||||
'not start with "text/"' % ct,
|
||||
'TOOLS.ENCODE')
|
||||
do_find = False
|
||||
else:
|
||||
if self.debug:
|
||||
cherrypy.log('Finding because not text_only', 'TOOLS.ENCODE')
|
||||
do_find = True
|
||||
|
||||
if do_find:
|
||||
# Set "charset=..." param on response Content-Type header
|
||||
ct.params['charset'] = self.find_acceptable_charset()
|
||||
if self.add_charset:
|
||||
if self.debug:
|
||||
cherrypy.log('Setting Content-Type %s' % ct,
|
||||
'TOOLS.ENCODE')
|
||||
response.headers["Content-Type"] = str(ct)
|
||||
|
||||
return self.body
|
||||
|
||||
# GZIP
|
||||
|
||||
def compress(body, compress_level):
|
||||
"""Compress 'body' at the given compress_level."""
|
||||
import zlib
|
||||
|
||||
# See http://www.gzip.org/zlib/rfc-gzip.html
|
||||
yield ntob('\x1f\x8b') # ID1 and ID2: gzip marker
|
||||
yield ntob('\x08') # CM: compression method
|
||||
yield ntob('\x00') # FLG: none set
|
||||
# MTIME: 4 bytes
|
||||
yield struct.pack("<L", int(time.time()) & int('FFFFFFFF', 16))
|
||||
yield ntob('\x02') # XFL: max compression, slowest algo
|
||||
yield ntob('\xff') # OS: unknown
|
||||
|
||||
crc = zlib.crc32(ntob(""))
|
||||
size = 0
|
||||
zobj = zlib.compressobj(compress_level,
|
||||
zlib.DEFLATED, -zlib.MAX_WBITS,
|
||||
zlib.DEF_MEM_LEVEL, 0)
|
||||
for line in body:
|
||||
size += len(line)
|
||||
crc = zlib.crc32(line, crc)
|
||||
yield zobj.compress(line)
|
||||
yield zobj.flush()
|
||||
|
||||
# CRC32: 4 bytes
|
||||
yield struct.pack("<L", crc & int('FFFFFFFF', 16))
|
||||
# ISIZE: 4 bytes
|
||||
yield struct.pack("<L", size & int('FFFFFFFF', 16))
|
||||
|
||||
def decompress(body):
|
||||
import gzip
|
||||
|
||||
zbuf = BytesIO()
|
||||
zbuf.write(body)
|
||||
zbuf.seek(0)
|
||||
zfile = gzip.GzipFile(mode='rb', fileobj=zbuf)
|
||||
data = zfile.read()
|
||||
zfile.close()
|
||||
return data
|
||||
|
||||
|
||||
def gzip(compress_level=5, mime_types=['text/html', 'text/plain'], debug=False):
|
||||
"""Try to gzip the response body if Content-Type in mime_types.
|
||||
|
||||
cherrypy.response.headers['Content-Type'] must be set to one of the
|
||||
values in the mime_types arg before calling this function.
|
||||
|
||||
The provided list of mime-types must be of one of the following form:
|
||||
* type/subtype
|
||||
* type/*
|
||||
* type/*+subtype
|
||||
|
||||
No compression is performed if any of the following hold:
|
||||
* The client sends no Accept-Encoding request header
|
||||
* No 'gzip' or 'x-gzip' is present in the Accept-Encoding header
|
||||
* No 'gzip' or 'x-gzip' with a qvalue > 0 is present
|
||||
* The 'identity' value is given with a qvalue > 0.
|
||||
|
||||
"""
|
||||
request = cherrypy.serving.request
|
||||
response = cherrypy.serving.response
|
||||
|
||||
set_vary_header(response, "Accept-Encoding")
|
||||
|
||||
if not response.body:
|
||||
# Response body is empty (might be a 304 for instance)
|
||||
if debug:
|
||||
cherrypy.log('No response body', context='TOOLS.GZIP')
|
||||
return
|
||||
|
||||
# If returning cached content (which should already have been gzipped),
|
||||
# don't re-zip.
|
||||
if getattr(request, "cached", False):
|
||||
if debug:
|
||||
cherrypy.log('Not gzipping cached response', context='TOOLS.GZIP')
|
||||
return
|
||||
|
||||
acceptable = request.headers.elements('Accept-Encoding')
|
||||
if not acceptable:
|
||||
# If no Accept-Encoding field is present in a request,
|
||||
# the server MAY assume that the client will accept any
|
||||
# content coding. In this case, if "identity" is one of
|
||||
# the available content-codings, then the server SHOULD use
|
||||
# the "identity" content-coding, unless it has additional
|
||||
# information that a different content-coding is meaningful
|
||||
# to the client.
|
||||
if debug:
|
||||
cherrypy.log('No Accept-Encoding', context='TOOLS.GZIP')
|
||||
return
|
||||
|
||||
ct = response.headers.get('Content-Type', '').split(';')[0]
|
||||
for coding in acceptable:
|
||||
if coding.value == 'identity' and coding.qvalue != 0:
|
||||
if debug:
|
||||
cherrypy.log('Non-zero identity qvalue: %s' % coding,
|
||||
context='TOOLS.GZIP')
|
||||
return
|
||||
if coding.value in ('gzip', 'x-gzip'):
|
||||
if coding.qvalue == 0:
|
||||
if debug:
|
||||
cherrypy.log('Zero gzip qvalue: %s' % coding,
|
||||
context='TOOLS.GZIP')
|
||||
return
|
||||
|
||||
if ct not in mime_types:
|
||||
# If the list of provided mime-types contains tokens
|
||||
# such as 'text/*' or 'application/*+xml',
|
||||
# we go through them and find the most appropriate one
|
||||
# based on the given content-type.
|
||||
# The pattern matching is only caring about the most
|
||||
# common cases, as stated above, and doesn't support
|
||||
# for extra parameters.
|
||||
found = False
|
||||
if '/' in ct:
|
||||
ct_media_type, ct_sub_type = ct.split('/')
|
||||
for mime_type in mime_types:
|
||||
if '/' in mime_type:
|
||||
media_type, sub_type = mime_type.split('/')
|
||||
if ct_media_type == media_type:
|
||||
if sub_type == '*':
|
||||
found = True
|
||||
break
|
||||
elif '+' in sub_type and '+' in ct_sub_type:
|
||||
ct_left, ct_right = ct_sub_type.split('+')
|
||||
left, right = sub_type.split('+')
|
||||
if left == '*' and ct_right == right:
|
||||
found = True
|
||||
break
|
||||
|
||||
if not found:
|
||||
if debug:
|
||||
cherrypy.log('Content-Type %s not in mime_types %r' %
|
||||
(ct, mime_types), context='TOOLS.GZIP')
|
||||
return
|
||||
|
||||
if debug:
|
||||
cherrypy.log('Gzipping', context='TOOLS.GZIP')
|
||||
# Return a generator that compresses the page
|
||||
response.headers['Content-Encoding'] = 'gzip'
|
||||
response.body = compress(response.body, compress_level)
|
||||
if "Content-Length" in response.headers:
|
||||
# Delete Content-Length header so finalize() recalcs it.
|
||||
del response.headers["Content-Length"]
|
||||
|
||||
return
|
||||
|
||||
if debug:
|
||||
cherrypy.log('No acceptable encoding found.', context='GZIP')
|
||||
cherrypy.HTTPError(406, "identity, gzip").set_response()
|
||||
|
||||
Reference in New Issue
Block a user