Mini Shell
import struct
import time
import io
import cherrypy
from cherrypy._cpcompat import text_or_bytes
from cherrypy.lib import file_generator
from cherrypy.lib import is_closable_iterator
from cherrypy.lib import set_vary_header
_COMPRESSION_LEVEL_FAST = 1
_COMPRESSION_LEVEL_BEST = 9
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 UTF8StreamEncoder:
def __init__(self, iterator):
self._iterator = iterator
def __iter__(self):
return self
def next(self):
return self.__next__()
def __next__(self):
res = next(self._iterator)
if isinstance(res, str):
res = res.encode('utf-8')
return res
def close(self):
if is_closable_iterator(self._iterator):
self._iterator.close()
def __getattr__(self, attr):
if attr.startswith('__'):
raise AttributeError(self, attr)
return getattr(self._iterator, attr)
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, str):
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)
body = []
for chunk in self.body:
if isinstance(chunk, str):
try:
chunk = chunk.encode(encoding, self.errors)
except (LookupError, UnicodeError):
return False
body.append(chunk)
self.body = body
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
_charsets = ', '.join(sorted(self.attempted_charsets))
msg += ' We tried these charsets: %s.' % (_charsets,)
raise cherrypy.HTTPError(406, msg)
def __call__(self, *args, **kwargs):
response = cherrypy.serving.response
self.body = self.oldhandler(*args, **kwargs)
self.body = prepare_iter(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 and self.add_charset:
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.debug:
cherrypy.log('Setting Content-Type %s' % ct,
'TOOLS.ENCODE')
response.headers['Content-Type'] = str(ct)
return self.body
def prepare_iter(value):
"""
Ensure response body is iterable and resolves to False when empty.
"""
if isinstance(value, text_or_bytes):
# 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 value:
value = [value]
else:
# [''] doesn't evaluate to False, so replace it with [].
value = []
# Don't use isinstance here; io.IOBase which has an ABC takes
# 1000 times as long as, say, isinstance(value, str)
elif hasattr(value, 'read'):
value = file_generator(value)
elif value is None:
value = []
return value
# GZIP
def compress(body, compress_level):
"""Compress 'body' at the given compress_level."""
import zlib
# See https://tools.ietf.org/html/rfc1952
yield b'\x1f\x8b' # ID1 and ID2: gzip marker
yield b'\x08' # CM: compression method
yield b'\x00' # FLG: none set
# MTIME: 4 bytes
yield struct.pack('<L', int(time.time()) & int('FFFFFFFF', 16))
# RFC 1952, section 2.3.1:
#
# XFL (eXtra FLags)
# These flags are available for use by specific compression
# methods. The "deflate" method (CM = 8) sets these flags as
# follows:
#
# XFL = 2 - compressor used maximum compression,
# slowest algorithm
# XFL = 4 - compressor used fastest algorithm
if compress_level == _COMPRESSION_LEVEL_BEST:
yield b'\x02' # XFL: max compression, slowest algo
elif compress_level == _COMPRESSION_LEVEL_FAST:
yield b'\x04' # XFL: min compression, fastest algo
else:
yield b'\x00' # XFL: compression unset/tradeoff
yield b'\xff' # OS: unknown
crc = zlib.crc32(b'')
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 = io.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()
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