bbf6d9b026
Bugfix for feeds
- removed categories related and up
- load new books now working
- category random now working
login page is free of non accessible elements
boolean custom column is vivible in UI
books with only with certain languages can be shown
book shelfs can be deleted from UI
Anonymous user view is more resticted
Added browse of series in sidebar
Dependencys in vendor folder are updated to newer versions (licencs files are now present)
Bugfix editing Authors names
Made upload on windows working
818 lines
24 KiB
Python
818 lines
24 KiB
Python
# -*- coding: utf-8 -*-
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"""
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requests.utils
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~~~~~~~~~~~~~~
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This module provides utility functions that are used within Requests
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that are also useful for external consumption.
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"""
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import cgi
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import codecs
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import collections
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import io
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import os
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import re
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import socket
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import struct
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import warnings
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from . import __version__
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from . import certs
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from .compat import parse_http_list as _parse_list_header
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from .compat import (quote, urlparse, bytes, str, OrderedDict, unquote, is_py2,
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builtin_str, getproxies, proxy_bypass, urlunparse,
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basestring)
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from .cookies import RequestsCookieJar, cookiejar_from_dict
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from .structures import CaseInsensitiveDict
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from .exceptions import InvalidURL, InvalidHeader, FileModeWarning
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_hush_pyflakes = (RequestsCookieJar,)
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NETRC_FILES = ('.netrc', '_netrc')
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DEFAULT_CA_BUNDLE_PATH = certs.where()
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def dict_to_sequence(d):
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"""Returns an internal sequence dictionary update."""
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if hasattr(d, 'items'):
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d = d.items()
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return d
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def super_len(o):
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total_length = 0
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current_position = 0
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if hasattr(o, '__len__'):
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total_length = len(o)
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elif hasattr(o, 'len'):
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total_length = o.len
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elif hasattr(o, 'getvalue'):
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# e.g. BytesIO, cStringIO.StringIO
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total_length = len(o.getvalue())
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elif hasattr(o, 'fileno'):
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try:
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fileno = o.fileno()
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except io.UnsupportedOperation:
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pass
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else:
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total_length = os.fstat(fileno).st_size
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# Having used fstat to determine the file length, we need to
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# confirm that this file was opened up in binary mode.
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if 'b' not in o.mode:
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warnings.warn((
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"Requests has determined the content-length for this "
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"request using the binary size of the file: however, the "
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"file has been opened in text mode (i.e. without the 'b' "
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"flag in the mode). This may lead to an incorrect "
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"content-length. In Requests 3.0, support will be removed "
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"for files in text mode."),
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FileModeWarning
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)
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if hasattr(o, 'tell'):
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try:
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current_position = o.tell()
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except (OSError, IOError):
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# This can happen in some weird situations, such as when the file
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# is actually a special file descriptor like stdin. In this
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# instance, we don't know what the length is, so set it to zero and
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# let requests chunk it instead.
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current_position = total_length
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return max(0, total_length - current_position)
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def get_netrc_auth(url, raise_errors=False):
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"""Returns the Requests tuple auth for a given url from netrc."""
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try:
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from netrc import netrc, NetrcParseError
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netrc_path = None
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for f in NETRC_FILES:
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try:
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loc = os.path.expanduser('~/{0}'.format(f))
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except KeyError:
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# os.path.expanduser can fail when $HOME is undefined and
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# getpwuid fails. See http://bugs.python.org/issue20164 &
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# https://github.com/kennethreitz/requests/issues/1846
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return
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if os.path.exists(loc):
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netrc_path = loc
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break
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# Abort early if there isn't one.
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if netrc_path is None:
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return
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ri = urlparse(url)
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# Strip port numbers from netloc. This weird `if...encode`` dance is
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# used for Python 3.2, which doesn't support unicode literals.
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splitstr = b':'
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if isinstance(url, str):
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splitstr = splitstr.decode('ascii')
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host = ri.netloc.split(splitstr)[0]
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try:
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_netrc = netrc(netrc_path).authenticators(host)
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if _netrc:
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# Return with login / password
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login_i = (0 if _netrc[0] else 1)
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return (_netrc[login_i], _netrc[2])
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except (NetrcParseError, IOError):
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# If there was a parsing error or a permissions issue reading the file,
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# we'll just skip netrc auth unless explicitly asked to raise errors.
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if raise_errors:
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raise
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# AppEngine hackiness.
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except (ImportError, AttributeError):
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pass
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def guess_filename(obj):
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"""Tries to guess the filename of the given object."""
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name = getattr(obj, 'name', None)
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if (name and isinstance(name, basestring) and name[0] != '<' and
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name[-1] != '>'):
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return os.path.basename(name)
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def from_key_val_list(value):
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"""Take an object and test to see if it can be represented as a
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dictionary. Unless it can not be represented as such, return an
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OrderedDict, e.g.,
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::
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>>> from_key_val_list([('key', 'val')])
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OrderedDict([('key', 'val')])
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>>> from_key_val_list('string')
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ValueError: need more than 1 value to unpack
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>>> from_key_val_list({'key': 'val'})
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OrderedDict([('key', 'val')])
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:rtype: OrderedDict
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"""
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if value is None:
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return None
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if isinstance(value, (str, bytes, bool, int)):
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raise ValueError('cannot encode objects that are not 2-tuples')
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return OrderedDict(value)
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def to_key_val_list(value):
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"""Take an object and test to see if it can be represented as a
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dictionary. If it can be, return a list of tuples, e.g.,
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::
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>>> to_key_val_list([('key', 'val')])
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[('key', 'val')]
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>>> to_key_val_list({'key': 'val'})
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[('key', 'val')]
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>>> to_key_val_list('string')
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ValueError: cannot encode objects that are not 2-tuples.
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:rtype: list
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"""
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if value is None:
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return None
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if isinstance(value, (str, bytes, bool, int)):
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raise ValueError('cannot encode objects that are not 2-tuples')
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if isinstance(value, collections.Mapping):
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value = value.items()
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return list(value)
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# From mitsuhiko/werkzeug (used with permission).
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def parse_list_header(value):
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"""Parse lists as described by RFC 2068 Section 2.
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In particular, parse comma-separated lists where the elements of
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the list may include quoted-strings. A quoted-string could
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contain a comma. A non-quoted string could have quotes in the
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middle. Quotes are removed automatically after parsing.
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It basically works like :func:`parse_set_header` just that items
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may appear multiple times and case sensitivity is preserved.
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The return value is a standard :class:`list`:
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>>> parse_list_header('token, "quoted value"')
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['token', 'quoted value']
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To create a header from the :class:`list` again, use the
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:func:`dump_header` function.
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:param value: a string with a list header.
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:return: :class:`list`
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:rtype: list
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"""
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result = []
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for item in _parse_list_header(value):
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if item[:1] == item[-1:] == '"':
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item = unquote_header_value(item[1:-1])
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result.append(item)
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return result
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# From mitsuhiko/werkzeug (used with permission).
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def parse_dict_header(value):
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"""Parse lists of key, value pairs as described by RFC 2068 Section 2 and
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convert them into a python dict:
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>>> d = parse_dict_header('foo="is a fish", bar="as well"')
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>>> type(d) is dict
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True
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>>> sorted(d.items())
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[('bar', 'as well'), ('foo', 'is a fish')]
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If there is no value for a key it will be `None`:
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>>> parse_dict_header('key_without_value')
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{'key_without_value': None}
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To create a header from the :class:`dict` again, use the
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:func:`dump_header` function.
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:param value: a string with a dict header.
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:return: :class:`dict`
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:rtype: dict
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"""
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result = {}
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for item in _parse_list_header(value):
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if '=' not in item:
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result[item] = None
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continue
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name, value = item.split('=', 1)
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if value[:1] == value[-1:] == '"':
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value = unquote_header_value(value[1:-1])
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result[name] = value
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return result
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# From mitsuhiko/werkzeug (used with permission).
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def unquote_header_value(value, is_filename=False):
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r"""Unquotes a header value. (Reversal of :func:`quote_header_value`).
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This does not use the real unquoting but what browsers are actually
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using for quoting.
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:param value: the header value to unquote.
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:rtype: str
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"""
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if value and value[0] == value[-1] == '"':
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# this is not the real unquoting, but fixing this so that the
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# RFC is met will result in bugs with internet explorer and
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# probably some other browsers as well. IE for example is
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# uploading files with "C:\foo\bar.txt" as filename
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value = value[1:-1]
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# if this is a filename and the starting characters look like
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# a UNC path, then just return the value without quotes. Using the
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# replace sequence below on a UNC path has the effect of turning
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# the leading double slash into a single slash and then
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# _fix_ie_filename() doesn't work correctly. See #458.
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if not is_filename or value[:2] != '\\\\':
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return value.replace('\\\\', '\\').replace('\\"', '"')
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return value
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def dict_from_cookiejar(cj):
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"""Returns a key/value dictionary from a CookieJar.
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:param cj: CookieJar object to extract cookies from.
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:rtype: dict
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"""
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cookie_dict = {}
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for cookie in cj:
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cookie_dict[cookie.name] = cookie.value
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return cookie_dict
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def add_dict_to_cookiejar(cj, cookie_dict):
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"""Returns a CookieJar from a key/value dictionary.
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:param cj: CookieJar to insert cookies into.
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:param cookie_dict: Dict of key/values to insert into CookieJar.
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:rtype: CookieJar
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"""
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cj2 = cookiejar_from_dict(cookie_dict)
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cj.update(cj2)
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return cj
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def get_encodings_from_content(content):
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"""Returns encodings from given content string.
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:param content: bytestring to extract encodings from.
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"""
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warnings.warn((
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'In requests 3.0, get_encodings_from_content will be removed. For '
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'more information, please see the discussion on issue #2266. (This'
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' warning should only appear once.)'),
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DeprecationWarning)
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charset_re = re.compile(r'<meta.*?charset=["\']*(.+?)["\'>]', flags=re.I)
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pragma_re = re.compile(r'<meta.*?content=["\']*;?charset=(.+?)["\'>]', flags=re.I)
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xml_re = re.compile(r'^<\?xml.*?encoding=["\']*(.+?)["\'>]')
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return (charset_re.findall(content) +
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pragma_re.findall(content) +
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xml_re.findall(content))
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def get_encoding_from_headers(headers):
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"""Returns encodings from given HTTP Header Dict.
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:param headers: dictionary to extract encoding from.
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:rtype: str
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"""
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content_type = headers.get('content-type')
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if not content_type:
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return None
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content_type, params = cgi.parse_header(content_type)
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if 'charset' in params:
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return params['charset'].strip("'\"")
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if 'text' in content_type:
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return 'ISO-8859-1'
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def stream_decode_response_unicode(iterator, r):
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"""Stream decodes a iterator."""
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if r.encoding is None:
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for item in iterator:
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yield item
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return
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decoder = codecs.getincrementaldecoder(r.encoding)(errors='replace')
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for chunk in iterator:
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rv = decoder.decode(chunk)
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if rv:
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yield rv
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rv = decoder.decode(b'', final=True)
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if rv:
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yield rv
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def iter_slices(string, slice_length):
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"""Iterate over slices of a string."""
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pos = 0
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if slice_length is None or slice_length <= 0:
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slice_length = len(string)
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while pos < len(string):
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yield string[pos:pos + slice_length]
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pos += slice_length
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def get_unicode_from_response(r):
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"""Returns the requested content back in unicode.
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:param r: Response object to get unicode content from.
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Tried:
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1. charset from content-type
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2. fall back and replace all unicode characters
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:rtype: str
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"""
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warnings.warn((
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'In requests 3.0, get_unicode_from_response will be removed. For '
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'more information, please see the discussion on issue #2266. (This'
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' warning should only appear once.)'),
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DeprecationWarning)
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tried_encodings = []
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# Try charset from content-type
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encoding = get_encoding_from_headers(r.headers)
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if encoding:
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try:
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return str(r.content, encoding)
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except UnicodeError:
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tried_encodings.append(encoding)
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# Fall back:
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try:
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return str(r.content, encoding, errors='replace')
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except TypeError:
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return r.content
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# The unreserved URI characters (RFC 3986)
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UNRESERVED_SET = frozenset(
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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+ "0123456789-._~")
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def unquote_unreserved(uri):
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"""Un-escape any percent-escape sequences in a URI that are unreserved
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characters. This leaves all reserved, illegal and non-ASCII bytes encoded.
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:rtype: str
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"""
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parts = uri.split('%')
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for i in range(1, len(parts)):
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h = parts[i][0:2]
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if len(h) == 2 and h.isalnum():
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try:
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c = chr(int(h, 16))
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except ValueError:
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raise InvalidURL("Invalid percent-escape sequence: '%s'" % h)
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if c in UNRESERVED_SET:
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parts[i] = c + parts[i][2:]
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else:
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parts[i] = '%' + parts[i]
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else:
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parts[i] = '%' + parts[i]
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return ''.join(parts)
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def requote_uri(uri):
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"""Re-quote the given URI.
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This function passes the given URI through an unquote/quote cycle to
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ensure that it is fully and consistently quoted.
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:rtype: str
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"""
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safe_with_percent = "!#$%&'()*+,/:;=?@[]~"
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safe_without_percent = "!#$&'()*+,/:;=?@[]~"
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try:
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# Unquote only the unreserved characters
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# Then quote only illegal characters (do not quote reserved,
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# unreserved, or '%')
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return quote(unquote_unreserved(uri), safe=safe_with_percent)
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except InvalidURL:
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# We couldn't unquote the given URI, so let's try quoting it, but
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# there may be unquoted '%'s in the URI. We need to make sure they're
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# properly quoted so they do not cause issues elsewhere.
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return quote(uri, safe=safe_without_percent)
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def address_in_network(ip, net):
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"""This function allows you to check if on IP belongs to a network subnet
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Example: returns True if ip = 192.168.1.1 and net = 192.168.1.0/24
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returns False if ip = 192.168.1.1 and net = 192.168.100.0/24
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:rtype: bool
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"""
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ipaddr = struct.unpack('=L', socket.inet_aton(ip))[0]
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netaddr, bits = net.split('/')
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netmask = struct.unpack('=L', socket.inet_aton(dotted_netmask(int(bits))))[0]
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network = struct.unpack('=L', socket.inet_aton(netaddr))[0] & netmask
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return (ipaddr & netmask) == (network & netmask)
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def dotted_netmask(mask):
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"""Converts mask from /xx format to xxx.xxx.xxx.xxx
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Example: if mask is 24 function returns 255.255.255.0
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:rtype: str
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"""
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bits = 0xffffffff ^ (1 << 32 - mask) - 1
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return socket.inet_ntoa(struct.pack('>I', bits))
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def is_ipv4_address(string_ip):
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"""
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:rtype: bool
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"""
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try:
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socket.inet_aton(string_ip)
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except socket.error:
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return False
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return True
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def is_valid_cidr(string_network):
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"""
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Very simple check of the cidr format in no_proxy variable.
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:rtype: bool
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"""
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if string_network.count('/') == 1:
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try:
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mask = int(string_network.split('/')[1])
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except ValueError:
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return False
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if mask < 1 or mask > 32:
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return False
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try:
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socket.inet_aton(string_network.split('/')[0])
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except socket.error:
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return False
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else:
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return False
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return True
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def should_bypass_proxies(url):
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"""
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Returns whether we should bypass proxies or not.
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|
|
|
:rtype: bool
|
|
"""
|
|
get_proxy = lambda k: os.environ.get(k) or os.environ.get(k.upper())
|
|
|
|
# First check whether no_proxy is defined. If it is, check that the URL
|
|
# we're getting isn't in the no_proxy list.
|
|
no_proxy = get_proxy('no_proxy')
|
|
netloc = urlparse(url).netloc
|
|
|
|
if no_proxy:
|
|
# We need to check whether we match here. We need to see if we match
|
|
# the end of the netloc, both with and without the port.
|
|
no_proxy = (
|
|
host for host in no_proxy.replace(' ', '').split(',') if host
|
|
)
|
|
|
|
ip = netloc.split(':')[0]
|
|
if is_ipv4_address(ip):
|
|
for proxy_ip in no_proxy:
|
|
if is_valid_cidr(proxy_ip):
|
|
if address_in_network(ip, proxy_ip):
|
|
return True
|
|
elif ip == proxy_ip:
|
|
# If no_proxy ip was defined in plain IP notation instead of cidr notation &
|
|
# matches the IP of the index
|
|
return True
|
|
else:
|
|
for host in no_proxy:
|
|
if netloc.endswith(host) or netloc.split(':')[0].endswith(host):
|
|
# The URL does match something in no_proxy, so we don't want
|
|
# to apply the proxies on this URL.
|
|
return True
|
|
|
|
# If the system proxy settings indicate that this URL should be bypassed,
|
|
# don't proxy.
|
|
# The proxy_bypass function is incredibly buggy on OS X in early versions
|
|
# of Python 2.6, so allow this call to fail. Only catch the specific
|
|
# exceptions we've seen, though: this call failing in other ways can reveal
|
|
# legitimate problems.
|
|
try:
|
|
bypass = proxy_bypass(netloc)
|
|
except (TypeError, socket.gaierror):
|
|
bypass = False
|
|
|
|
if bypass:
|
|
return True
|
|
|
|
return False
|
|
|
|
|
|
def get_environ_proxies(url):
|
|
"""
|
|
Return a dict of environment proxies.
|
|
|
|
:rtype: dict
|
|
"""
|
|
if should_bypass_proxies(url):
|
|
return {}
|
|
else:
|
|
return getproxies()
|
|
|
|
|
|
def select_proxy(url, proxies):
|
|
"""Select a proxy for the url, if applicable.
|
|
|
|
:param url: The url being for the request
|
|
:param proxies: A dictionary of schemes or schemes and hosts to proxy URLs
|
|
"""
|
|
proxies = proxies or {}
|
|
urlparts = urlparse(url)
|
|
if urlparts.hostname is None:
|
|
return proxies.get('all', proxies.get(urlparts.scheme))
|
|
|
|
proxy_keys = [
|
|
'all://' + urlparts.hostname,
|
|
'all',
|
|
urlparts.scheme + '://' + urlparts.hostname,
|
|
urlparts.scheme,
|
|
]
|
|
proxy = None
|
|
for proxy_key in proxy_keys:
|
|
if proxy_key in proxies:
|
|
proxy = proxies[proxy_key]
|
|
break
|
|
|
|
return proxy
|
|
|
|
|
|
def default_user_agent(name="python-requests"):
|
|
"""
|
|
Return a string representing the default user agent.
|
|
|
|
:rtype: str
|
|
"""
|
|
return '%s/%s' % (name, __version__)
|
|
|
|
|
|
def default_headers():
|
|
"""
|
|
:rtype: requests.structures.CaseInsensitiveDict
|
|
"""
|
|
return CaseInsensitiveDict({
|
|
'User-Agent': default_user_agent(),
|
|
'Accept-Encoding': ', '.join(('gzip', 'deflate')),
|
|
'Accept': '*/*',
|
|
'Connection': 'keep-alive',
|
|
})
|
|
|
|
|
|
def parse_header_links(value):
|
|
"""Return a dict of parsed link headers proxies.
|
|
|
|
i.e. Link: <http:/.../front.jpeg>; rel=front; type="image/jpeg",<http://.../back.jpeg>; rel=back;type="image/jpeg"
|
|
|
|
:rtype: list
|
|
"""
|
|
|
|
links = []
|
|
|
|
replace_chars = ' \'"'
|
|
|
|
for val in re.split(', *<', value):
|
|
try:
|
|
url, params = val.split(';', 1)
|
|
except ValueError:
|
|
url, params = val, ''
|
|
|
|
link = {'url': url.strip('<> \'"')}
|
|
|
|
for param in params.split(';'):
|
|
try:
|
|
key, value = param.split('=')
|
|
except ValueError:
|
|
break
|
|
|
|
link[key.strip(replace_chars)] = value.strip(replace_chars)
|
|
|
|
links.append(link)
|
|
|
|
return links
|
|
|
|
|
|
# Null bytes; no need to recreate these on each call to guess_json_utf
|
|
_null = '\x00'.encode('ascii') # encoding to ASCII for Python 3
|
|
_null2 = _null * 2
|
|
_null3 = _null * 3
|
|
|
|
|
|
def guess_json_utf(data):
|
|
"""
|
|
:rtype: str
|
|
"""
|
|
# JSON always starts with two ASCII characters, so detection is as
|
|
# easy as counting the nulls and from their location and count
|
|
# determine the encoding. Also detect a BOM, if present.
|
|
sample = data[:4]
|
|
if sample in (codecs.BOM_UTF32_LE, codecs.BOM32_BE):
|
|
return 'utf-32' # BOM included
|
|
if sample[:3] == codecs.BOM_UTF8:
|
|
return 'utf-8-sig' # BOM included, MS style (discouraged)
|
|
if sample[:2] in (codecs.BOM_UTF16_LE, codecs.BOM_UTF16_BE):
|
|
return 'utf-16' # BOM included
|
|
nullcount = sample.count(_null)
|
|
if nullcount == 0:
|
|
return 'utf-8'
|
|
if nullcount == 2:
|
|
if sample[::2] == _null2: # 1st and 3rd are null
|
|
return 'utf-16-be'
|
|
if sample[1::2] == _null2: # 2nd and 4th are null
|
|
return 'utf-16-le'
|
|
# Did not detect 2 valid UTF-16 ascii-range characters
|
|
if nullcount == 3:
|
|
if sample[:3] == _null3:
|
|
return 'utf-32-be'
|
|
if sample[1:] == _null3:
|
|
return 'utf-32-le'
|
|
# Did not detect a valid UTF-32 ascii-range character
|
|
return None
|
|
|
|
|
|
def prepend_scheme_if_needed(url, new_scheme):
|
|
"""Given a URL that may or may not have a scheme, prepend the given scheme.
|
|
Does not replace a present scheme with the one provided as an argument.
|
|
|
|
:rtype: str
|
|
"""
|
|
scheme, netloc, path, params, query, fragment = urlparse(url, new_scheme)
|
|
|
|
# urlparse is a finicky beast, and sometimes decides that there isn't a
|
|
# netloc present. Assume that it's being over-cautious, and switch netloc
|
|
# and path if urlparse decided there was no netloc.
|
|
if not netloc:
|
|
netloc, path = path, netloc
|
|
|
|
return urlunparse((scheme, netloc, path, params, query, fragment))
|
|
|
|
|
|
def get_auth_from_url(url):
|
|
"""Given a url with authentication components, extract them into a tuple of
|
|
username,password.
|
|
|
|
:rtype: (str,str)
|
|
"""
|
|
parsed = urlparse(url)
|
|
|
|
try:
|
|
auth = (unquote(parsed.username), unquote(parsed.password))
|
|
except (AttributeError, TypeError):
|
|
auth = ('', '')
|
|
|
|
return auth
|
|
|
|
|
|
def to_native_string(string, encoding='ascii'):
|
|
"""Given a string object, regardless of type, returns a representation of
|
|
that string in the native string type, encoding and decoding where
|
|
necessary. This assumes ASCII unless told otherwise.
|
|
"""
|
|
if isinstance(string, builtin_str):
|
|
out = string
|
|
else:
|
|
if is_py2:
|
|
out = string.encode(encoding)
|
|
else:
|
|
out = string.decode(encoding)
|
|
|
|
return out
|
|
|
|
|
|
# Moved outside of function to avoid recompile every call
|
|
_CLEAN_HEADER_REGEX_BYTE = re.compile(b'^\\S[^\\r\\n]*$|^$')
|
|
_CLEAN_HEADER_REGEX_STR = re.compile(r'^\S[^\r\n]*$|^$')
|
|
|
|
def check_header_validity(header):
|
|
"""Verifies that header value is a string which doesn't contain
|
|
leading whitespace or return characters. This prevents unintended
|
|
header injection.
|
|
|
|
:param header: tuple, in the format (name, value).
|
|
"""
|
|
name, value = header
|
|
|
|
if isinstance(value, bytes):
|
|
pat = _CLEAN_HEADER_REGEX_BYTE
|
|
else:
|
|
pat = _CLEAN_HEADER_REGEX_STR
|
|
try:
|
|
if not pat.match(value):
|
|
raise InvalidHeader("Invalid return character or leading space in header: %s" % name)
|
|
except TypeError:
|
|
raise InvalidHeader("Header value %s must be of type str or bytes, "
|
|
"not %s" % (value, type(value)))
|
|
|
|
|
|
def urldefragauth(url):
|
|
"""
|
|
Given a url remove the fragment and the authentication part.
|
|
|
|
:rtype: str
|
|
"""
|
|
scheme, netloc, path, params, query, fragment = urlparse(url)
|
|
|
|
# see func:`prepend_scheme_if_needed`
|
|
if not netloc:
|
|
netloc, path = path, netloc
|
|
|
|
netloc = netloc.rsplit('@', 1)[-1]
|
|
|
|
return urlunparse((scheme, netloc, path, params, query, ''))
|