413 lines
13 KiB
Python
413 lines
13 KiB
Python
# -*- coding: utf-8 -*-
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"""
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werkzeug._internal
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~~~~~~~~~~~~~~~~~~
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This module provides internally used helpers and constants.
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:copyright: (c) 2013 by the Werkzeug Team, see AUTHORS for more details.
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:license: BSD, see LICENSE for more details.
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"""
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import re
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import string
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import inspect
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from weakref import WeakKeyDictionary
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from datetime import datetime, date
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from itertools import chain
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from werkzeug._compat import iter_bytes, text_type, BytesIO, int_to_byte, \
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range_type, to_native
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_logger = None
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_empty_stream = BytesIO()
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_signature_cache = WeakKeyDictionary()
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_epoch_ord = date(1970, 1, 1).toordinal()
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_cookie_params = set((b'expires', b'path', b'comment',
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b'max-age', b'secure', b'httponly',
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b'version'))
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_legal_cookie_chars = (string.ascii_letters +
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string.digits +
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u"!#$%&'*+-.^_`|~:").encode('ascii')
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_cookie_quoting_map = {
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b',' : b'\\054',
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b';' : b'\\073',
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b'"' : b'\\"',
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b'\\' : b'\\\\',
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}
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for _i in chain(range_type(32), range_type(127, 256)):
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_cookie_quoting_map[int_to_byte(_i)] = ('\\%03o' % _i).encode('latin1')
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_octal_re = re.compile(b'\\\\[0-3][0-7][0-7]')
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_quote_re = re.compile(b'[\\\\].')
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_legal_cookie_chars_re = b'[\w\d!#%&\'~_`><@,:/\$\*\+\-\.\^\|\)\(\?\}\{\=]'
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_cookie_re = re.compile(b"""(?x)
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(?P<key>[^=]+)
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\s*=\s*
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(?P<val>
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"(?:[^\\\\"]|\\\\.)*" |
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(?:.*?)
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)
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\s*;
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""")
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class _Missing(object):
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def __repr__(self):
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return 'no value'
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def __reduce__(self):
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return '_missing'
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_missing = _Missing()
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def _get_environ(obj):
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env = getattr(obj, 'environ', obj)
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assert isinstance(env, dict), \
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'%r is not a WSGI environment (has to be a dict)' % type(obj).__name__
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return env
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def _log(type, message, *args, **kwargs):
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"""Log into the internal werkzeug logger."""
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global _logger
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if _logger is None:
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import logging
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_logger = logging.getLogger('werkzeug')
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# Only set up a default log handler if the
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# end-user application didn't set anything up.
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if not logging.root.handlers and _logger.level == logging.NOTSET:
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_logger.setLevel(logging.INFO)
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handler = logging.StreamHandler()
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_logger.addHandler(handler)
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getattr(_logger, type)(message.rstrip(), *args, **kwargs)
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def _parse_signature(func):
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"""Return a signature object for the function."""
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if hasattr(func, 'im_func'):
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func = func.im_func
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# if we have a cached validator for this function, return it
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parse = _signature_cache.get(func)
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if parse is not None:
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return parse
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# inspect the function signature and collect all the information
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positional, vararg_var, kwarg_var, defaults = inspect.getargspec(func)
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defaults = defaults or ()
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arg_count = len(positional)
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arguments = []
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for idx, name in enumerate(positional):
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if isinstance(name, list):
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raise TypeError('cannot parse functions that unpack tuples '
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'in the function signature')
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try:
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default = defaults[idx - arg_count]
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except IndexError:
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param = (name, False, None)
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else:
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param = (name, True, default)
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arguments.append(param)
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arguments = tuple(arguments)
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def parse(args, kwargs):
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new_args = []
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missing = []
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extra = {}
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# consume as many arguments as positional as possible
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for idx, (name, has_default, default) in enumerate(arguments):
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try:
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new_args.append(args[idx])
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except IndexError:
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try:
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new_args.append(kwargs.pop(name))
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except KeyError:
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if has_default:
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new_args.append(default)
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else:
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missing.append(name)
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else:
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if name in kwargs:
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extra[name] = kwargs.pop(name)
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# handle extra arguments
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extra_positional = args[arg_count:]
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if vararg_var is not None:
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new_args.extend(extra_positional)
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extra_positional = ()
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if kwargs and not kwarg_var is not None:
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extra.update(kwargs)
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kwargs = {}
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return new_args, kwargs, missing, extra, extra_positional, \
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arguments, vararg_var, kwarg_var
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_signature_cache[func] = parse
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return parse
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def _date_to_unix(arg):
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"""Converts a timetuple, integer or datetime object into the seconds from
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epoch in utc.
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"""
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if isinstance(arg, datetime):
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arg = arg.utctimetuple()
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elif isinstance(arg, (int, long, float)):
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return int(arg)
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year, month, day, hour, minute, second = arg[:6]
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days = date(year, month, 1).toordinal() - _epoch_ord + day - 1
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hours = days * 24 + hour
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minutes = hours * 60 + minute
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seconds = minutes * 60 + second
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return seconds
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class _DictAccessorProperty(object):
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"""Baseclass for `environ_property` and `header_property`."""
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read_only = False
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def __init__(self, name, default=None, load_func=None, dump_func=None,
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read_only=None, doc=None):
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self.name = name
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self.default = default
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self.load_func = load_func
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self.dump_func = dump_func
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if read_only is not None:
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self.read_only = read_only
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self.__doc__ = doc
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def __get__(self, obj, type=None):
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if obj is None:
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return self
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storage = self.lookup(obj)
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if self.name not in storage:
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return self.default
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rv = storage[self.name]
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if self.load_func is not None:
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try:
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rv = self.load_func(rv)
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except (ValueError, TypeError):
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rv = self.default
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return rv
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def __set__(self, obj, value):
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if self.read_only:
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raise AttributeError('read only property')
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if self.dump_func is not None:
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value = self.dump_func(value)
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self.lookup(obj)[self.name] = value
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def __delete__(self, obj):
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if self.read_only:
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raise AttributeError('read only property')
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self.lookup(obj).pop(self.name, None)
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def __repr__(self):
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return '<%s %s>' % (
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self.__class__.__name__,
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self.name
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)
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def _cookie_quote(b):
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buf = bytearray()
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all_legal = True
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_lookup = _cookie_quoting_map.get
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_push = buf.extend
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for char in iter_bytes(b):
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if char not in _legal_cookie_chars:
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all_legal = False
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char = _lookup(char, char)
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_push(char)
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if all_legal:
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return bytes(buf)
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return bytes(b'"' + buf + b'"')
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def _cookie_unquote(b):
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if len(b) < 2:
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return b
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if b[:1] != b'"' or b[-1:] != b'"':
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return b
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b = b[1:-1]
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i = 0
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n = len(b)
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rv = bytearray()
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_push = rv.extend
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while 0 <= i < n:
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o_match = _octal_re.search(b, i)
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q_match = _quote_re.search(b, i)
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if not o_match and not q_match:
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rv.extend(b[i:])
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break
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j = k = -1
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if o_match:
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j = o_match.start(0)
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if q_match:
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k = q_match.start(0)
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if q_match and (not o_match or k < j):
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_push(b[i:k])
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_push(b[k + 1])
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i = k + 2
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else:
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_push(b[i:j])
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rv.append(int(b[j + 1:j + 4], 8))
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i = j + 4
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return bytes(rv)
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def _cookie_parse_impl(b):
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"""Lowlevel cookie parsing facility that operates on bytes."""
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i = 0
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n = len(b)
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while i < n:
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match = _cookie_re.search(b + b';', i)
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if not match:
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break
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key = match.group('key').strip()
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value = match.group('val')
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i = match.end(0)
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# Ignore parameters. We have no interest in them.
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if key.lower() not in _cookie_params:
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yield _cookie_unquote(key), _cookie_unquote(value)
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def _encode_idna(domain):
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# If we're given bytes, make sure they fit into ASCII
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if not isinstance(domain, text_type):
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domain.decode('ascii')
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return domain
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# Otherwise check if it's already ascii, then return
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try:
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return domain.encode('ascii')
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except UnicodeError:
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pass
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# Otherwise encode each part separately
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parts = domain.split('.')
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for idx, part in enumerate(parts):
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parts[idx] = part.encode('idna')
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return b'.'.join(parts)
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def _decode_idna(domain):
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# If the input is a string try to encode it to ascii to
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# do the idna decoding. if that fails because of an
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# unicode error, then we already have a decoded idna domain
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if isinstance(domain, text_type):
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try:
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domain = domain.encode('ascii')
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except UnicodeError:
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return domain
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# Decode each part separately. If a part fails, try to
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# decode it with ascii and silently ignore errors. This makes
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# most sense because the idna codec does not have error handling
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parts = domain.split(b'.')
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for idx, part in enumerate(parts):
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try:
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parts[idx] = part.decode('idna')
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except UnicodeError:
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parts[idx] = part.decode('ascii', 'ignore')
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return '.'.join(parts)
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def _make_cookie_domain(domain):
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if domain is None:
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return None
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domain = _encode_idna(domain)
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if b':' in domain:
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domain = domain.split(b':', 1)[0]
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if b'.' in domain:
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return domain
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raise ValueError(
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'Setting \'domain\' for a cookie on a server running localy (ex: '
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'localhost) is not supportted by complying browsers. You should '
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'have something like: \'127.0.0.1 localhost dev.localhost\' on '
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'your hosts file and then point your server to run on '
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'\'dev.localhost\' and also set \'domain\' for \'dev.localhost\''
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)
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def _easteregg(app=None):
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"""Like the name says. But who knows how it works?"""
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def bzzzzzzz(gyver):
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import base64
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import zlib
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return zlib.decompress(base64.b64decode(gyver)).decode('ascii')
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gyver = u'\n'.join([x + (77 - len(x)) * u' ' for x in bzzzzzzz(b'''
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eJyFlzuOJDkMRP06xRjymKgDJCDQStBYT8BCgK4gTwfQ2fcFs2a2FzvZk+hvlcRvRJD148efHt9m
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9Xz94dRY5hGt1nrYcXx7us9qlcP9HHNh28rz8dZj+q4rynVFFPdlY4zH873NKCexrDM6zxxRymzz
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4QIxzK4bth1PV7+uHn6WXZ5C4ka/+prFzx3zWLMHAVZb8RRUxtFXI5DTQ2n3Hi2sNI+HK43AOWSY
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jmEzE4naFp58PdzhPMdslLVWHTGUVpSxImw+pS/D+JhzLfdS1j7PzUMxij+mc2U0I9zcbZ/HcZxc
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q1QjvvcThMYFnp93agEx392ZdLJWXbi/Ca4Oivl4h/Y1ErEqP+lrg7Xa4qnUKu5UE9UUA4xeqLJ5
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jWlPKJvR2yhRI7xFPdzPuc6adXu6ovwXwRPXXnZHxlPtkSkqWHilsOrGrvcVWXgGP3daXomCj317
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8P2UOw/NnA0OOikZyFf3zZ76eN9QXNwYdD8f8/LdBRFg0BO3bB+Pe/+G8er8tDJv83XTkj7WeMBJ
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v/rnAfdO51d6sFglfi8U7zbnr0u9tyJHhFZNXYfH8Iafv2Oa+DT6l8u9UYlajV/hcEgk1x8E8L/r
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XJXl2SK+GJCxtnyhVKv6GFCEB1OO3f9YWAIEbwcRWv/6RPpsEzOkXURMN37J0PoCSYeBnJQd9Giu
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LxYQJNlYPSo/iTQwgaihbART7Fcyem2tTSCcwNCs85MOOpJtXhXDe0E7zgZJkcxWTar/zEjdIVCk
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iXy87FW6j5aGZhttDBoAZ3vnmlkx4q4mMmCdLtnHkBXFMCReqthSGkQ+MDXLLCpXwBs0t+sIhsDI
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tjBB8MwqYQpLygZ56rRHHpw+OAVyGgaGRHWy2QfXez+ZQQTTBkmRXdV/A9LwH6XGZpEAZU8rs4pE
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1R4FQ3Uwt8RKEtRc0/CrANUoes3EzM6WYcFyskGZ6UTHJWenBDS7h163Eo2bpzqxNE9aVgEM2CqI
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GAJe9Yra4P5qKmta27VjzYdR04Vc7KHeY4vs61C0nbywFmcSXYjzBHdiEjraS7PGG2jHHTpJUMxN
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Jlxr3pUuFvlBWLJGE3GcA1/1xxLcHmlO+LAXbhrXah1tD6Ze+uqFGdZa5FM+3eHcKNaEarutAQ0A
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QMAZHV+ve6LxAwWnXbbSXEG2DmCX5ijeLCKj5lhVFBrMm+ryOttCAeFpUdZyQLAQkA06RLs56rzG
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8MID55vqr/g64Qr/wqwlE0TVxgoiZhHrbY2h1iuuyUVg1nlkpDrQ7Vm1xIkI5XRKLedN9EjzVchu
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jQhXcVkjVdgP2O99QShpdvXWoSwkp5uMwyjt3jiWCqWGSiaaPAzohjPanXVLbM3x0dNskJsaCEyz
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DTKIs+7WKJD4ZcJGfMhLFBf6hlbnNkLEePF8Cx2o2kwmYF4+MzAxa6i+6xIQkswOqGO+3x9NaZX8
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MrZRaFZpLeVTYI9F/djY6DDVVs340nZGmwrDqTCiiqD5luj3OzwpmQCiQhdRYowUYEA3i1WWGwL4
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GCtSoO4XbIPFeKGU13XPkDf5IdimLpAvi2kVDVQbzOOa4KAXMFlpi/hV8F6IDe0Y2reg3PuNKT3i
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RYhZqtkQZqSB2Qm0SGtjAw7RDwaM1roESC8HWiPxkoOy0lLTRFG39kvbLZbU9gFKFRvixDZBJmpi
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Xyq3RE5lW00EJjaqwp/v3EByMSpVZYsEIJ4APaHmVtpGSieV5CALOtNUAzTBiw81GLgC0quyzf6c
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NlWknzJeCsJ5fup2R4d8CYGN77mu5vnO1UqbfElZ9E6cR6zbHjgsr9ly18fXjZoPeDjPuzlWbFwS
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pdvPkhntFvkc13qb9094LL5NrA3NIq3r9eNnop9DizWOqCEbyRBFJTHn6Tt3CG1o8a4HevYh0XiJ
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sR0AVVHuGuMOIfbuQ/OKBkGRC6NJ4u7sbPX8bG/n5sNIOQ6/Y/BX3IwRlTSabtZpYLB85lYtkkgm
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p1qXK3Du2mnr5INXmT/78KI12n11EFBkJHHp0wJyLe9MvPNUGYsf+170maayRoy2lURGHAIapSpQ
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krEDuNoJCHNlZYhKpvw4mspVWxqo415n8cD62N9+EfHrAvqQnINStetek7RY2Urv8nxsnGaZfRr/
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nhXbJ6m/yl1LzYqscDZA9QHLNbdaSTTr+kFg3bC0iYbX/eQy0Bv3h4B50/SGYzKAXkCeOLI3bcAt
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mj2Z/FM1vQWgDynsRwNvrWnJHlespkrp8+vO1jNaibm+PhqXPPv30YwDZ6jApe3wUjFQobghvW9p
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7f2zLkGNv8b191cD/3vs9Q833z8t''').splitlines()])
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def easteregged(environ, start_response):
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def injecting_start_response(status, headers, exc_info=None):
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headers.append(('X-Powered-By', 'Werkzeug'))
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return start_response(status, headers, exc_info)
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if app is not None and environ.get('QUERY_STRING') != 'macgybarchakku':
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return app(environ, injecting_start_response)
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injecting_start_response('200 OK', [('Content-Type', 'text/html')])
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return [(u'''
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<!DOCTYPE html>
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<html>
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<head>
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<title>About Werkzeug</title>
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<style type="text/css">
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body { font: 15px Georgia, serif; text-align: center; }
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a { color: #333; text-decoration: none; }
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h1 { font-size: 30px; margin: 20px 0 10px 0; }
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p { margin: 0 0 30px 0; }
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pre { font: 11px 'Consolas', 'Monaco', monospace; line-height: 0.95; }
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</style>
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</head>
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<body>
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<h1><a href="http://werkzeug.pocoo.org/">Werkzeug</a></h1>
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<p>the Swiss Army knife of Python web development.</p>
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<pre>%s\n\n\n</pre>
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</body>
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</html>''' % gyver).encode('latin1')]
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return easteregged
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