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
1023 lines
34 KiB
Python
1023 lines
34 KiB
Python
# -*- coding: utf-8 -*-
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"""
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werkzeug.http
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~~~~~~~~~~~~~
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Werkzeug comes with a bunch of utilities that help Werkzeug to deal with
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HTTP data. Most of the classes and functions provided by this module are
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used by the wrappers, but they are useful on their own, too, especially if
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the response and request objects are not used.
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This covers some of the more HTTP centric features of WSGI, some other
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utilities such as cookie handling are documented in the `werkzeug.utils`
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module.
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:copyright: (c) 2014 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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from time import time, gmtime
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try:
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from email.utils import parsedate_tz
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except ImportError: # pragma: no cover
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from email.Utils import parsedate_tz
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try:
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from urllib2 import parse_http_list as _parse_list_header
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except ImportError: # pragma: no cover
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from urllib.request import parse_http_list as _parse_list_header
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from datetime import datetime, timedelta
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from hashlib import md5
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import base64
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from werkzeug._internal import _cookie_quote, _make_cookie_domain, \
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_cookie_parse_impl
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from werkzeug._compat import to_unicode, iteritems, text_type, \
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string_types, try_coerce_native, to_bytes, PY2, \
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integer_types
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_cookie_charset = 'latin1'
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# for explanation of "media-range", etc. see Sections 5.3.{1,2} of RFC 7231
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_accept_re = re.compile(
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r'''( # media-range capturing-parenthesis
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[^\s;,]+ # type/subtype
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(?:[ \t]*;[ \t]* # ";"
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(?: # parameter non-capturing-parenthesis
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[^\s;,q][^\s;,]* # token that doesn't start with "q"
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| # or
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q[^\s;,=][^\s;,]* # token that is more than just "q"
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)
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)* # zero or more parameters
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) # end of media-range
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(?:[ \t]*;[ \t]*q= # weight is a "q" parameter
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(\d*(?:\.\d+)?) # qvalue capturing-parentheses
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[^,]* # "extension" accept params: who cares?
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)? # accept params are optional
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''', re.VERBOSE)
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_token_chars = frozenset("!#$%&'*+-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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'^_`abcdefghijklmnopqrstuvwxyz|~')
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_etag_re = re.compile(r'([Ww]/)?(?:"(.*?)"|(.*?))(?:\s*,\s*|$)')
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_unsafe_header_chars = set('()<>@,;:\"/[]?={} \t')
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_quoted_string_re = r'"[^"\\]*(?:\\.[^"\\]*)*"'
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_option_header_piece_re = re.compile(
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r';\s*(%s|[^\s;,=]+)\s*(?:=\s*(%s|[^;,]+)?)?\s*' %
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(_quoted_string_re, _quoted_string_re)
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)
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_option_header_start_mime_type = re.compile(r',\s*([^;,\s]+)([;,]\s*.+)?')
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_entity_headers = frozenset([
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'allow', 'content-encoding', 'content-language', 'content-length',
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'content-location', 'content-md5', 'content-range', 'content-type',
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'expires', 'last-modified'
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])
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_hop_by_hop_headers = frozenset([
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'connection', 'keep-alive', 'proxy-authenticate',
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'proxy-authorization', 'te', 'trailer', 'transfer-encoding',
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'upgrade'
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])
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HTTP_STATUS_CODES = {
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100: 'Continue',
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101: 'Switching Protocols',
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102: 'Processing',
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200: 'OK',
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201: 'Created',
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202: 'Accepted',
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203: 'Non Authoritative Information',
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204: 'No Content',
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205: 'Reset Content',
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206: 'Partial Content',
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207: 'Multi Status',
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226: 'IM Used', # see RFC 3229
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300: 'Multiple Choices',
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301: 'Moved Permanently',
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302: 'Found',
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303: 'See Other',
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304: 'Not Modified',
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305: 'Use Proxy',
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307: 'Temporary Redirect',
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400: 'Bad Request',
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401: 'Unauthorized',
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402: 'Payment Required', # unused
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403: 'Forbidden',
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404: 'Not Found',
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405: 'Method Not Allowed',
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406: 'Not Acceptable',
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407: 'Proxy Authentication Required',
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408: 'Request Timeout',
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409: 'Conflict',
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410: 'Gone',
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411: 'Length Required',
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412: 'Precondition Failed',
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413: 'Request Entity Too Large',
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414: 'Request URI Too Long',
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415: 'Unsupported Media Type',
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416: 'Requested Range Not Satisfiable',
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417: 'Expectation Failed',
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418: 'I\'m a teapot', # see RFC 2324
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422: 'Unprocessable Entity',
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423: 'Locked',
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424: 'Failed Dependency',
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426: 'Upgrade Required',
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428: 'Precondition Required', # see RFC 6585
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429: 'Too Many Requests',
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431: 'Request Header Fields Too Large',
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449: 'Retry With', # proprietary MS extension
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500: 'Internal Server Error',
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501: 'Not Implemented',
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502: 'Bad Gateway',
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503: 'Service Unavailable',
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504: 'Gateway Timeout',
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505: 'HTTP Version Not Supported',
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507: 'Insufficient Storage',
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510: 'Not Extended'
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}
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def wsgi_to_bytes(data):
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"""coerce wsgi unicode represented bytes to real ones
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"""
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if isinstance(data, bytes):
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return data
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return data.encode('latin1') # XXX: utf8 fallback?
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def bytes_to_wsgi(data):
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assert isinstance(data, bytes), 'data must be bytes'
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if isinstance(data, str):
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return data
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else:
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return data.decode('latin1')
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def quote_header_value(value, extra_chars='', allow_token=True):
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"""Quote a header value if necessary.
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.. versionadded:: 0.5
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:param value: the value to quote.
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:param extra_chars: a list of extra characters to skip quoting.
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:param allow_token: if this is enabled token values are returned
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unchanged.
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"""
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if isinstance(value, bytes):
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value = bytes_to_wsgi(value)
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value = str(value)
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if allow_token:
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token_chars = _token_chars | set(extra_chars)
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if set(value).issubset(token_chars):
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return value
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return '"%s"' % value.replace('\\', '\\\\').replace('"', '\\"')
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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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.. versionadded:: 0.5
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:param value: the header value to unquote.
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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 dump_options_header(header, options):
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"""The reverse function to :func:`parse_options_header`.
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:param header: the header to dump
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:param options: a dict of options to append.
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"""
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segments = []
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if header is not None:
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segments.append(header)
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for key, value in iteritems(options):
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if value is None:
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segments.append(key)
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else:
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segments.append('%s=%s' % (key, quote_header_value(value)))
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return '; '.join(segments)
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def dump_header(iterable, allow_token=True):
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"""Dump an HTTP header again. This is the reversal of
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:func:`parse_list_header`, :func:`parse_set_header` and
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:func:`parse_dict_header`. This also quotes strings that include an
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equals sign unless you pass it as dict of key, value pairs.
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>>> dump_header({'foo': 'bar baz'})
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'foo="bar baz"'
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>>> dump_header(('foo', 'bar baz'))
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'foo, "bar baz"'
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:param iterable: the iterable or dict of values to quote.
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:param allow_token: if set to `False` tokens as values are disallowed.
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See :func:`quote_header_value` for more details.
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"""
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if isinstance(iterable, dict):
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items = []
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for key, value in iteritems(iterable):
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if value is None:
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items.append(key)
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else:
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items.append('%s=%s' % (
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key,
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quote_header_value(value, allow_token=allow_token)
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))
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else:
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items = [quote_header_value(x, allow_token=allow_token)
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for x in iterable]
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return ', '.join(items)
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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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"""
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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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def parse_dict_header(value, cls=dict):
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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 (or any other mapping object created from
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the type with a dict like interface provided by the `cls` arugment):
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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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.. versionchanged:: 0.9
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Added support for `cls` argument.
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:param value: a string with a dict header.
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:param cls: callable to use for storage of parsed results.
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:return: an instance of `cls`
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"""
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result = cls()
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if not isinstance(value, text_type):
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# XXX: validate
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value = bytes_to_wsgi(value)
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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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def parse_options_header(value, multiple=False):
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"""Parse a ``Content-Type`` like header into a tuple with the content
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type and the options:
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>>> parse_options_header('text/html; charset=utf8')
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('text/html', {'charset': 'utf8'})
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This should not be used to parse ``Cache-Control`` like headers that use
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a slightly different format. For these headers use the
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:func:`parse_dict_header` function.
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.. versionadded:: 0.5
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:param value: the header to parse.
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:param multiple: Whether try to parse and return multiple MIME types
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:return: (mimetype, options) or (mimetype, options, mimetype, options, …)
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if multiple=True
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"""
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if not value:
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return '', {}
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result = []
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value = "," + value.replace("\n", ",")
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while value:
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match = _option_header_start_mime_type.match(value)
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if not match:
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break
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result.append(match.group(1)) # mimetype
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options = {}
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# Parse options
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rest = match.group(2)
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while rest:
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optmatch = _option_header_piece_re.match(rest)
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if not optmatch:
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break
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option, option_value = optmatch.groups()
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option = unquote_header_value(option)
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if option_value is not None:
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option_value = unquote_header_value(
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option_value,
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option == 'filename')
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options[option] = option_value
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rest = rest[optmatch.end():]
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result.append(options)
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if multiple is False:
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return tuple(result)
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value = rest
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return tuple(result) if result else ('', {})
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def parse_accept_header(value, cls=None):
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"""Parses an HTTP Accept-* header. This does not implement a complete
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valid algorithm but one that supports at least value and quality
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extraction.
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Returns a new :class:`Accept` object (basically a list of ``(value, quality)``
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tuples sorted by the quality with some additional accessor methods).
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The second parameter can be a subclass of :class:`Accept` that is created
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with the parsed values and returned.
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:param value: the accept header string to be parsed.
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:param cls: the wrapper class for the return value (can be
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:class:`Accept` or a subclass thereof)
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:return: an instance of `cls`.
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"""
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if cls is None:
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cls = Accept
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if not value:
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return cls(None)
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result = []
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for match in _accept_re.finditer(value):
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quality = match.group(2)
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if not quality:
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quality = 1
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else:
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quality = max(min(float(quality), 1), 0)
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result.append((match.group(1), quality))
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return cls(result)
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def parse_cache_control_header(value, on_update=None, cls=None):
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"""Parse a cache control header. The RFC differs between response and
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request cache control, this method does not. It's your responsibility
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to not use the wrong control statements.
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.. versionadded:: 0.5
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The `cls` was added. If not specified an immutable
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:class:`~werkzeug.datastructures.RequestCacheControl` is returned.
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|
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|
:param value: a cache control header to be parsed.
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|
:param on_update: an optional callable that is called every time a value
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|
on the :class:`~werkzeug.datastructures.CacheControl`
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|
object is changed.
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|
:param cls: the class for the returned object. By default
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|
:class:`~werkzeug.datastructures.RequestCacheControl` is used.
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|
:return: a `cls` object.
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|
"""
|
|
if cls is None:
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|
cls = RequestCacheControl
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|
if not value:
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return cls(None, on_update)
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return cls(parse_dict_header(value), on_update)
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|
|
|
|
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def parse_set_header(value, on_update=None):
|
|
"""Parse a set-like header and return a
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|
:class:`~werkzeug.datastructures.HeaderSet` object:
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|
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|
>>> hs = parse_set_header('token, "quoted value"')
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|
|
|
The return value is an object that treats the items case-insensitively
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|
and keeps the order of the items:
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|
|
|
>>> 'TOKEN' in hs
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|
True
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|
>>> hs.index('quoted value')
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1
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|
>>> hs
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HeaderSet(['token', 'quoted value'])
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|
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|
To create a header from the :class:`HeaderSet` again, use the
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|
:func:`dump_header` function.
|
|
|
|
:param value: a set header to be parsed.
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|
:param on_update: an optional callable that is called every time a
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|
value on the :class:`~werkzeug.datastructures.HeaderSet`
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|
object is changed.
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|
:return: a :class:`~werkzeug.datastructures.HeaderSet`
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|
"""
|
|
if not value:
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|
return HeaderSet(None, on_update)
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|
return HeaderSet(parse_list_header(value), on_update)
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|
|
|
|
|
def parse_authorization_header(value):
|
|
"""Parse an HTTP basic/digest authorization header transmitted by the web
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|
browser. The return value is either `None` if the header was invalid or
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|
not given, otherwise an :class:`~werkzeug.datastructures.Authorization`
|
|
object.
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|
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|
:param value: the authorization header to parse.
|
|
:return: a :class:`~werkzeug.datastructures.Authorization` object or `None`.
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|
"""
|
|
if not value:
|
|
return
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|
value = wsgi_to_bytes(value)
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|
try:
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auth_type, auth_info = value.split(None, 1)
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auth_type = auth_type.lower()
|
|
except ValueError:
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return
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if auth_type == b'basic':
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try:
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username, password = base64.b64decode(auth_info).split(b':', 1)
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except Exception:
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return
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return Authorization('basic', {'username': bytes_to_wsgi(username),
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'password': bytes_to_wsgi(password)})
|
|
elif auth_type == b'digest':
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|
auth_map = parse_dict_header(auth_info)
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|
for key in 'username', 'realm', 'nonce', 'uri', 'response':
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|
if key not in auth_map:
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return
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|
if 'qop' in auth_map:
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|
if not auth_map.get('nc') or not auth_map.get('cnonce'):
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return
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return Authorization('digest', auth_map)
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|
|
|
|
|
def parse_www_authenticate_header(value, on_update=None):
|
|
"""Parse an HTTP WWW-Authenticate header into a
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:class:`~werkzeug.datastructures.WWWAuthenticate` object.
|
|
|
|
:param value: a WWW-Authenticate header to parse.
|
|
:param on_update: an optional callable that is called every time a value
|
|
on the :class:`~werkzeug.datastructures.WWWAuthenticate`
|
|
object is changed.
|
|
:return: a :class:`~werkzeug.datastructures.WWWAuthenticate` object.
|
|
"""
|
|
if not value:
|
|
return WWWAuthenticate(on_update=on_update)
|
|
try:
|
|
auth_type, auth_info = value.split(None, 1)
|
|
auth_type = auth_type.lower()
|
|
except (ValueError, AttributeError):
|
|
return WWWAuthenticate(value.strip().lower(), on_update=on_update)
|
|
return WWWAuthenticate(auth_type, parse_dict_header(auth_info),
|
|
on_update)
|
|
|
|
|
|
def parse_if_range_header(value):
|
|
"""Parses an if-range header which can be an etag or a date. Returns
|
|
a :class:`~werkzeug.datastructures.IfRange` object.
|
|
|
|
.. versionadded:: 0.7
|
|
"""
|
|
if not value:
|
|
return IfRange()
|
|
date = parse_date(value)
|
|
if date is not None:
|
|
return IfRange(date=date)
|
|
# drop weakness information
|
|
return IfRange(unquote_etag(value)[0])
|
|
|
|
|
|
def parse_range_header(value, make_inclusive=True):
|
|
"""Parses a range header into a :class:`~werkzeug.datastructures.Range`
|
|
object. If the header is missing or malformed `None` is returned.
|
|
`ranges` is a list of ``(start, stop)`` tuples where the ranges are
|
|
non-inclusive.
|
|
|
|
.. versionadded:: 0.7
|
|
"""
|
|
if not value or '=' not in value:
|
|
return None
|
|
|
|
ranges = []
|
|
last_end = 0
|
|
units, rng = value.split('=', 1)
|
|
units = units.strip().lower()
|
|
|
|
for item in rng.split(','):
|
|
item = item.strip()
|
|
if '-' not in item:
|
|
return None
|
|
if item.startswith('-'):
|
|
if last_end < 0:
|
|
return None
|
|
begin = int(item)
|
|
end = None
|
|
last_end = -1
|
|
elif '-' in item:
|
|
begin, end = item.split('-', 1)
|
|
begin = int(begin)
|
|
if begin < last_end or last_end < 0:
|
|
return None
|
|
if end:
|
|
end = int(end) + 1
|
|
if begin >= end:
|
|
return None
|
|
else:
|
|
end = None
|
|
last_end = end
|
|
ranges.append((begin, end))
|
|
|
|
return Range(units, ranges)
|
|
|
|
|
|
def parse_content_range_header(value, on_update=None):
|
|
"""Parses a range header into a
|
|
:class:`~werkzeug.datastructures.ContentRange` object or `None` if
|
|
parsing is not possible.
|
|
|
|
.. versionadded:: 0.7
|
|
|
|
:param value: a content range header to be parsed.
|
|
:param on_update: an optional callable that is called every time a value
|
|
on the :class:`~werkzeug.datastructures.ContentRange`
|
|
object is changed.
|
|
"""
|
|
if value is None:
|
|
return None
|
|
try:
|
|
units, rangedef = (value or '').strip().split(None, 1)
|
|
except ValueError:
|
|
return None
|
|
|
|
if '/' not in rangedef:
|
|
return None
|
|
rng, length = rangedef.split('/', 1)
|
|
if length == '*':
|
|
length = None
|
|
elif length.isdigit():
|
|
length = int(length)
|
|
else:
|
|
return None
|
|
|
|
if rng == '*':
|
|
return ContentRange(units, None, None, length, on_update=on_update)
|
|
elif '-' not in rng:
|
|
return None
|
|
|
|
start, stop = rng.split('-', 1)
|
|
try:
|
|
start = int(start)
|
|
stop = int(stop) + 1
|
|
except ValueError:
|
|
return None
|
|
|
|
if is_byte_range_valid(start, stop, length):
|
|
return ContentRange(units, start, stop, length, on_update=on_update)
|
|
|
|
|
|
def quote_etag(etag, weak=False):
|
|
"""Quote an etag.
|
|
|
|
:param etag: the etag to quote.
|
|
:param weak: set to `True` to tag it "weak".
|
|
"""
|
|
if '"' in etag:
|
|
raise ValueError('invalid etag')
|
|
etag = '"%s"' % etag
|
|
if weak:
|
|
etag = 'W/' + etag
|
|
return etag
|
|
|
|
|
|
def unquote_etag(etag):
|
|
"""Unquote a single etag:
|
|
|
|
>>> unquote_etag('W/"bar"')
|
|
('bar', True)
|
|
>>> unquote_etag('"bar"')
|
|
('bar', False)
|
|
|
|
:param etag: the etag identifier to unquote.
|
|
:return: a ``(etag, weak)`` tuple.
|
|
"""
|
|
if not etag:
|
|
return None, None
|
|
etag = etag.strip()
|
|
weak = False
|
|
if etag.startswith(('W/', 'w/')):
|
|
weak = True
|
|
etag = etag[2:]
|
|
if etag[:1] == etag[-1:] == '"':
|
|
etag = etag[1:-1]
|
|
return etag, weak
|
|
|
|
|
|
def parse_etags(value):
|
|
"""Parse an etag header.
|
|
|
|
:param value: the tag header to parse
|
|
:return: an :class:`~werkzeug.datastructures.ETags` object.
|
|
"""
|
|
if not value:
|
|
return ETags()
|
|
strong = []
|
|
weak = []
|
|
end = len(value)
|
|
pos = 0
|
|
while pos < end:
|
|
match = _etag_re.match(value, pos)
|
|
if match is None:
|
|
break
|
|
is_weak, quoted, raw = match.groups()
|
|
if raw == '*':
|
|
return ETags(star_tag=True)
|
|
elif quoted:
|
|
raw = quoted
|
|
if is_weak:
|
|
weak.append(raw)
|
|
else:
|
|
strong.append(raw)
|
|
pos = match.end()
|
|
return ETags(strong, weak)
|
|
|
|
|
|
def generate_etag(data):
|
|
"""Generate an etag for some data."""
|
|
return md5(data).hexdigest()
|
|
|
|
|
|
def parse_date(value):
|
|
"""Parse one of the following date formats into a datetime object:
|
|
|
|
.. sourcecode:: text
|
|
|
|
Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
|
|
Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
|
|
Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
|
|
|
|
If parsing fails the return value is `None`.
|
|
|
|
:param value: a string with a supported date format.
|
|
:return: a :class:`datetime.datetime` object.
|
|
"""
|
|
if value:
|
|
t = parsedate_tz(value.strip())
|
|
if t is not None:
|
|
try:
|
|
year = t[0]
|
|
# unfortunately that function does not tell us if two digit
|
|
# years were part of the string, or if they were prefixed
|
|
# with two zeroes. So what we do is to assume that 69-99
|
|
# refer to 1900, and everything below to 2000
|
|
if year >= 0 and year <= 68:
|
|
year += 2000
|
|
elif year >= 69 and year <= 99:
|
|
year += 1900
|
|
return datetime(*((year,) + t[1:7])) - \
|
|
timedelta(seconds=t[-1] or 0)
|
|
except (ValueError, OverflowError):
|
|
return None
|
|
|
|
|
|
def _dump_date(d, delim):
|
|
"""Used for `http_date` and `cookie_date`."""
|
|
if d is None:
|
|
d = gmtime()
|
|
elif isinstance(d, datetime):
|
|
d = d.utctimetuple()
|
|
elif isinstance(d, (integer_types, float)):
|
|
d = gmtime(d)
|
|
return '%s, %02d%s%s%s%s %02d:%02d:%02d GMT' % (
|
|
('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun')[d.tm_wday],
|
|
d.tm_mday, delim,
|
|
('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
|
|
'Oct', 'Nov', 'Dec')[d.tm_mon - 1],
|
|
delim, str(d.tm_year), d.tm_hour, d.tm_min, d.tm_sec
|
|
)
|
|
|
|
|
|
def cookie_date(expires=None):
|
|
"""Formats the time to ensure compatibility with Netscape's cookie
|
|
standard.
|
|
|
|
Accepts a floating point number expressed in seconds since the epoch in, a
|
|
datetime object or a timetuple. All times in UTC. The :func:`parse_date`
|
|
function can be used to parse such a date.
|
|
|
|
Outputs a string in the format ``Wdy, DD-Mon-YYYY HH:MM:SS GMT``.
|
|
|
|
:param expires: If provided that date is used, otherwise the current.
|
|
"""
|
|
return _dump_date(expires, '-')
|
|
|
|
|
|
def http_date(timestamp=None):
|
|
"""Formats the time to match the RFC1123 date format.
|
|
|
|
Accepts a floating point number expressed in seconds since the epoch in, a
|
|
datetime object or a timetuple. All times in UTC. The :func:`parse_date`
|
|
function can be used to parse such a date.
|
|
|
|
Outputs a string in the format ``Wdy, DD Mon YYYY HH:MM:SS GMT``.
|
|
|
|
:param timestamp: If provided that date is used, otherwise the current.
|
|
"""
|
|
return _dump_date(timestamp, ' ')
|
|
|
|
|
|
def is_resource_modified(environ, etag=None, data=None, last_modified=None):
|
|
"""Convenience method for conditional requests.
|
|
|
|
:param environ: the WSGI environment of the request to be checked.
|
|
:param etag: the etag for the response for comparison.
|
|
:param data: or alternatively the data of the response to automatically
|
|
generate an etag using :func:`generate_etag`.
|
|
:param last_modified: an optional date of the last modification.
|
|
:return: `True` if the resource was modified, otherwise `False`.
|
|
"""
|
|
if etag is None and data is not None:
|
|
etag = generate_etag(data)
|
|
elif data is not None:
|
|
raise TypeError('both data and etag given')
|
|
if environ['REQUEST_METHOD'] not in ('GET', 'HEAD'):
|
|
return False
|
|
|
|
unmodified = False
|
|
if isinstance(last_modified, string_types):
|
|
last_modified = parse_date(last_modified)
|
|
|
|
# ensure that microsecond is zero because the HTTP spec does not transmit
|
|
# that either and we might have some false positives. See issue #39
|
|
if last_modified is not None:
|
|
last_modified = last_modified.replace(microsecond=0)
|
|
|
|
modified_since = parse_date(environ.get('HTTP_IF_MODIFIED_SINCE'))
|
|
|
|
if modified_since and last_modified and last_modified <= modified_since:
|
|
unmodified = True
|
|
if etag:
|
|
if_none_match = parse_etags(environ.get('HTTP_IF_NONE_MATCH'))
|
|
if if_none_match:
|
|
# http://tools.ietf.org/html/rfc7232#section-3.2
|
|
# "A recipient MUST use the weak comparison function when comparing
|
|
# entity-tags for If-None-Match"
|
|
etag, _ = unquote_etag(etag)
|
|
unmodified = if_none_match.contains_weak(etag)
|
|
|
|
return not unmodified
|
|
|
|
|
|
def remove_entity_headers(headers, allowed=('expires', 'content-location')):
|
|
"""Remove all entity headers from a list or :class:`Headers` object. This
|
|
operation works in-place. `Expires` and `Content-Location` headers are
|
|
by default not removed. The reason for this is :rfc:`2616` section
|
|
10.3.5 which specifies some entity headers that should be sent.
|
|
|
|
.. versionchanged:: 0.5
|
|
added `allowed` parameter.
|
|
|
|
:param headers: a list or :class:`Headers` object.
|
|
:param allowed: a list of headers that should still be allowed even though
|
|
they are entity headers.
|
|
"""
|
|
allowed = set(x.lower() for x in allowed)
|
|
headers[:] = [(key, value) for key, value in headers if
|
|
not is_entity_header(key) or key.lower() in allowed]
|
|
|
|
|
|
def remove_hop_by_hop_headers(headers):
|
|
"""Remove all HTTP/1.1 "Hop-by-Hop" headers from a list or
|
|
:class:`Headers` object. This operation works in-place.
|
|
|
|
.. versionadded:: 0.5
|
|
|
|
:param headers: a list or :class:`Headers` object.
|
|
"""
|
|
headers[:] = [(key, value) for key, value in headers if
|
|
not is_hop_by_hop_header(key)]
|
|
|
|
|
|
def is_entity_header(header):
|
|
"""Check if a header is an entity header.
|
|
|
|
.. versionadded:: 0.5
|
|
|
|
:param header: the header to test.
|
|
:return: `True` if it's an entity header, `False` otherwise.
|
|
"""
|
|
return header.lower() in _entity_headers
|
|
|
|
|
|
def is_hop_by_hop_header(header):
|
|
"""Check if a header is an HTTP/1.1 "Hop-by-Hop" header.
|
|
|
|
.. versionadded:: 0.5
|
|
|
|
:param header: the header to test.
|
|
:return: `True` if it's an entity header, `False` otherwise.
|
|
"""
|
|
return header.lower() in _hop_by_hop_headers
|
|
|
|
|
|
def parse_cookie(header, charset='utf-8', errors='replace', cls=None):
|
|
"""Parse a cookie. Either from a string or WSGI environ.
|
|
|
|
Per default encoding errors are ignored. If you want a different behavior
|
|
you can set `errors` to ``'replace'`` or ``'strict'``. In strict mode a
|
|
:exc:`HTTPUnicodeError` is raised.
|
|
|
|
.. versionchanged:: 0.5
|
|
This function now returns a :class:`TypeConversionDict` instead of a
|
|
regular dict. The `cls` parameter was added.
|
|
|
|
:param header: the header to be used to parse the cookie. Alternatively
|
|
this can be a WSGI environment.
|
|
:param charset: the charset for the cookie values.
|
|
:param errors: the error behavior for the charset decoding.
|
|
:param cls: an optional dict class to use. If this is not specified
|
|
or `None` the default :class:`TypeConversionDict` is
|
|
used.
|
|
"""
|
|
if isinstance(header, dict):
|
|
header = header.get('HTTP_COOKIE', '')
|
|
elif header is None:
|
|
header = ''
|
|
|
|
# If the value is an unicode string it's mangled through latin1. This
|
|
# is done because on PEP 3333 on Python 3 all headers are assumed latin1
|
|
# which however is incorrect for cookies, which are sent in page encoding.
|
|
# As a result we
|
|
if isinstance(header, text_type):
|
|
header = header.encode('latin1', 'replace')
|
|
|
|
if cls is None:
|
|
cls = TypeConversionDict
|
|
|
|
def _parse_pairs():
|
|
for key, val in _cookie_parse_impl(header):
|
|
key = to_unicode(key, charset, errors, allow_none_charset=True)
|
|
val = to_unicode(val, charset, errors, allow_none_charset=True)
|
|
yield try_coerce_native(key), val
|
|
|
|
return cls(_parse_pairs())
|
|
|
|
|
|
def dump_cookie(key, value='', max_age=None, expires=None, path='/',
|
|
domain=None, secure=False, httponly=False,
|
|
charset='utf-8', sync_expires=True):
|
|
"""Creates a new Set-Cookie header without the ``Set-Cookie`` prefix
|
|
The parameters are the same as in the cookie Morsel object in the
|
|
Python standard library but it accepts unicode data, too.
|
|
|
|
On Python 3 the return value of this function will be a unicode
|
|
string, on Python 2 it will be a native string. In both cases the
|
|
return value is usually restricted to ascii as the vast majority of
|
|
values are properly escaped, but that is no guarantee. If a unicode
|
|
string is returned it's tunneled through latin1 as required by
|
|
PEP 3333.
|
|
|
|
The return value is not ASCII safe if the key contains unicode
|
|
characters. This is technically against the specification but
|
|
happens in the wild. It's strongly recommended to not use
|
|
non-ASCII values for the keys.
|
|
|
|
:param max_age: should be a number of seconds, or `None` (default) if
|
|
the cookie should last only as long as the client's
|
|
browser session. Additionally `timedelta` objects
|
|
are accepted, too.
|
|
:param expires: should be a `datetime` object or unix timestamp.
|
|
:param path: limits the cookie to a given path, per default it will
|
|
span the whole domain.
|
|
:param domain: Use this if you want to set a cross-domain cookie. For
|
|
example, ``domain=".example.com"`` will set a cookie
|
|
that is readable by the domain ``www.example.com``,
|
|
``foo.example.com`` etc. Otherwise, a cookie will only
|
|
be readable by the domain that set it.
|
|
:param secure: The cookie will only be available via HTTPS
|
|
:param httponly: disallow JavaScript to access the cookie. This is an
|
|
extension to the cookie standard and probably not
|
|
supported by all browsers.
|
|
:param charset: the encoding for unicode values.
|
|
:param sync_expires: automatically set expires if max_age is defined
|
|
but expires not.
|
|
"""
|
|
key = to_bytes(key, charset)
|
|
value = to_bytes(value, charset)
|
|
|
|
if path is not None:
|
|
path = iri_to_uri(path, charset)
|
|
domain = _make_cookie_domain(domain)
|
|
if isinstance(max_age, timedelta):
|
|
max_age = (max_age.days * 60 * 60 * 24) + max_age.seconds
|
|
if expires is not None:
|
|
if not isinstance(expires, string_types):
|
|
expires = cookie_date(expires)
|
|
elif max_age is not None and sync_expires:
|
|
expires = to_bytes(cookie_date(time() + max_age))
|
|
|
|
buf = [key + b'=' + _cookie_quote(value)]
|
|
|
|
# XXX: In theory all of these parameters that are not marked with `None`
|
|
# should be quoted. Because stdlib did not quote it before I did not
|
|
# want to introduce quoting there now.
|
|
for k, v, q in ((b'Domain', domain, True),
|
|
(b'Expires', expires, False,),
|
|
(b'Max-Age', max_age, False),
|
|
(b'Secure', secure, None),
|
|
(b'HttpOnly', httponly, None),
|
|
(b'Path', path, False)):
|
|
if q is None:
|
|
if v:
|
|
buf.append(k)
|
|
continue
|
|
|
|
if v is None:
|
|
continue
|
|
|
|
tmp = bytearray(k)
|
|
if not isinstance(v, (bytes, bytearray)):
|
|
v = to_bytes(text_type(v), charset)
|
|
if q:
|
|
v = _cookie_quote(v)
|
|
tmp += b'=' + v
|
|
buf.append(bytes(tmp))
|
|
|
|
# The return value will be an incorrectly encoded latin1 header on
|
|
# Python 3 for consistency with the headers object and a bytestring
|
|
# on Python 2 because that's how the API makes more sense.
|
|
rv = b'; '.join(buf)
|
|
if not PY2:
|
|
rv = rv.decode('latin1')
|
|
return rv
|
|
|
|
|
|
def is_byte_range_valid(start, stop, length):
|
|
"""Checks if a given byte content range is valid for the given length.
|
|
|
|
.. versionadded:: 0.7
|
|
"""
|
|
if (start is None) != (stop is None):
|
|
return False
|
|
elif start is None:
|
|
return length is None or length >= 0
|
|
elif length is None:
|
|
return 0 <= start < stop
|
|
elif start >= stop:
|
|
return False
|
|
return 0 <= start < length
|
|
|
|
|
|
# circular dependency fun
|
|
from werkzeug.datastructures import Accept, HeaderSet, ETags, Authorization, \
|
|
WWWAuthenticate, TypeConversionDict, IfRange, Range, ContentRange, \
|
|
RequestCacheControl
|
|
|
|
|
|
# DEPRECATED
|
|
# backwards compatible imports
|
|
from werkzeug.datastructures import ( # noqa
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MIMEAccept, CharsetAccept, LanguageAccept, Headers
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)
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from werkzeug.urls import iri_to_uri
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