876 lines
28 KiB
Python
876 lines
28 KiB
Python
#!/usr/bin/env python
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#
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# Copyright 2009 Facebook
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""HTTP utility code shared by clients and servers.
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This module also defines the `HTTPServerRequest` class which is exposed
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via `tornado.web.RequestHandler.request`.
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"""
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from __future__ import absolute_import, division, print_function, with_statement
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import calendar
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import collections
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import copy
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import datetime
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import email.utils
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import numbers
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import re
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import time
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from tornado.escape import native_str, parse_qs_bytes, utf8
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from tornado.log import gen_log
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from tornado.util import ObjectDict
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try:
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import Cookie # py2
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except ImportError:
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import http.cookies as Cookie # py3
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try:
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from httplib import responses # py2
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except ImportError:
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from http.client import responses # py3
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# responses is unused in this file, but we re-export it to other files.
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# Reference it so pyflakes doesn't complain.
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responses
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try:
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from urllib import urlencode # py2
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except ImportError:
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from urllib.parse import urlencode # py3
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try:
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from ssl import SSLError
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except ImportError:
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# ssl is unavailable on app engine.
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class SSLError(Exception):
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pass
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class _NormalizedHeaderCache(dict):
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"""Dynamic cached mapping of header names to Http-Header-Case.
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Implemented as a dict subclass so that cache hits are as fast as a
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normal dict lookup, without the overhead of a python function
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call.
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>>> normalized_headers = _NormalizedHeaderCache(10)
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>>> normalized_headers["coNtent-TYPE"]
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'Content-Type'
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"""
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def __init__(self, size):
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super(_NormalizedHeaderCache, self).__init__()
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self.size = size
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self.queue = collections.deque()
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def __missing__(self, key):
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normalized = "-".join([w.capitalize() for w in key.split("-")])
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self[key] = normalized
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self.queue.append(key)
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if len(self.queue) > self.size:
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# Limit the size of the cache. LRU would be better, but this
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# simpler approach should be fine. In Python 2.7+ we could
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# use OrderedDict (or in 3.2+, @functools.lru_cache).
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old_key = self.queue.popleft()
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del self[old_key]
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return normalized
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_normalized_headers = _NormalizedHeaderCache(1000)
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class HTTPHeaders(dict):
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"""A dictionary that maintains ``Http-Header-Case`` for all keys.
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Supports multiple values per key via a pair of new methods,
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`add()` and `get_list()`. The regular dictionary interface
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returns a single value per key, with multiple values joined by a
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comma.
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>>> h = HTTPHeaders({"content-type": "text/html"})
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>>> list(h.keys())
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['Content-Type']
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>>> h["Content-Type"]
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'text/html'
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>>> h.add("Set-Cookie", "A=B")
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>>> h.add("Set-Cookie", "C=D")
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>>> h["set-cookie"]
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'A=B,C=D'
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>>> h.get_list("set-cookie")
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['A=B', 'C=D']
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>>> for (k,v) in sorted(h.get_all()):
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... print('%s: %s' % (k,v))
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...
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Content-Type: text/html
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Set-Cookie: A=B
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Set-Cookie: C=D
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"""
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def __init__(self, *args, **kwargs):
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# Don't pass args or kwargs to dict.__init__, as it will bypass
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# our __setitem__
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dict.__init__(self)
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self._as_list = {}
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self._last_key = None
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if (len(args) == 1 and len(kwargs) == 0 and
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isinstance(args[0], HTTPHeaders)):
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# Copy constructor
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for k, v in args[0].get_all():
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self.add(k, v)
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else:
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# Dict-style initialization
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self.update(*args, **kwargs)
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# new public methods
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def add(self, name, value):
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"""Adds a new value for the given key."""
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norm_name = _normalized_headers[name]
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self._last_key = norm_name
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if norm_name in self:
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# bypass our override of __setitem__ since it modifies _as_list
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dict.__setitem__(self, norm_name,
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native_str(self[norm_name]) + ',' +
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native_str(value))
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self._as_list[norm_name].append(value)
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else:
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self[norm_name] = value
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def get_list(self, name):
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"""Returns all values for the given header as a list."""
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norm_name = _normalized_headers[name]
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return self._as_list.get(norm_name, [])
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def get_all(self):
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"""Returns an iterable of all (name, value) pairs.
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If a header has multiple values, multiple pairs will be
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returned with the same name.
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"""
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for name, values in self._as_list.items():
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for value in values:
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yield (name, value)
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def parse_line(self, line):
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"""Updates the dictionary with a single header line.
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>>> h = HTTPHeaders()
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>>> h.parse_line("Content-Type: text/html")
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>>> h.get('content-type')
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'text/html'
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"""
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if line[0].isspace():
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# continuation of a multi-line header
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new_part = ' ' + line.lstrip()
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self._as_list[self._last_key][-1] += new_part
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dict.__setitem__(self, self._last_key,
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self[self._last_key] + new_part)
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else:
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name, value = line.split(":", 1)
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self.add(name, value.strip())
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@classmethod
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def parse(cls, headers):
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"""Returns a dictionary from HTTP header text.
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>>> h = HTTPHeaders.parse("Content-Type: text/html\\r\\nContent-Length: 42\\r\\n")
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>>> sorted(h.items())
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[('Content-Length', '42'), ('Content-Type', 'text/html')]
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"""
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h = cls()
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for line in headers.splitlines():
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if line:
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h.parse_line(line)
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return h
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# dict implementation overrides
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def __setitem__(self, name, value):
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norm_name = _normalized_headers[name]
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dict.__setitem__(self, norm_name, value)
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self._as_list[norm_name] = [value]
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def __getitem__(self, name):
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return dict.__getitem__(self, _normalized_headers[name])
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def __delitem__(self, name):
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norm_name = _normalized_headers[name]
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dict.__delitem__(self, norm_name)
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del self._as_list[norm_name]
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def __contains__(self, name):
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norm_name = _normalized_headers[name]
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return dict.__contains__(self, norm_name)
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def get(self, name, default=None):
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return dict.get(self, _normalized_headers[name], default)
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def update(self, *args, **kwargs):
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# dict.update bypasses our __setitem__
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for k, v in dict(*args, **kwargs).items():
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self[k] = v
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def copy(self):
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# default implementation returns dict(self), not the subclass
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return HTTPHeaders(self)
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class HTTPServerRequest(object):
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"""A single HTTP request.
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All attributes are type `str` unless otherwise noted.
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.. attribute:: method
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HTTP request method, e.g. "GET" or "POST"
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.. attribute:: uri
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The requested uri.
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.. attribute:: path
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The path portion of `uri`
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.. attribute:: query
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The query portion of `uri`
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.. attribute:: version
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HTTP version specified in request, e.g. "HTTP/1.1"
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.. attribute:: headers
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`.HTTPHeaders` dictionary-like object for request headers. Acts like
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a case-insensitive dictionary with additional methods for repeated
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headers.
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.. attribute:: body
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Request body, if present, as a byte string.
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.. attribute:: remote_ip
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Client's IP address as a string. If ``HTTPServer.xheaders`` is set,
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will pass along the real IP address provided by a load balancer
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in the ``X-Real-Ip`` or ``X-Forwarded-For`` header.
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.. versionchanged:: 3.1
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The list format of ``X-Forwarded-For`` is now supported.
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.. attribute:: protocol
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The protocol used, either "http" or "https". If ``HTTPServer.xheaders``
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is set, will pass along the protocol used by a load balancer if
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reported via an ``X-Scheme`` header.
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.. attribute:: host
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The requested hostname, usually taken from the ``Host`` header.
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.. attribute:: arguments
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GET/POST arguments are available in the arguments property, which
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maps arguments names to lists of values (to support multiple values
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for individual names). Names are of type `str`, while arguments
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are byte strings. Note that this is different from
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`.RequestHandler.get_argument`, which returns argument values as
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unicode strings.
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.. attribute:: query_arguments
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Same format as ``arguments``, but contains only arguments extracted
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from the query string.
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.. versionadded:: 3.2
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.. attribute:: body_arguments
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Same format as ``arguments``, but contains only arguments extracted
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from the request body.
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.. versionadded:: 3.2
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.. attribute:: files
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File uploads are available in the files property, which maps file
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names to lists of `.HTTPFile`.
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.. attribute:: connection
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An HTTP request is attached to a single HTTP connection, which can
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be accessed through the "connection" attribute. Since connections
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are typically kept open in HTTP/1.1, multiple requests can be handled
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sequentially on a single connection.
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.. versionchanged:: 4.0
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Moved from ``tornado.httpserver.HTTPRequest``.
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"""
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def __init__(self, method=None, uri=None, version="HTTP/1.0", headers=None,
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body=None, host=None, files=None, connection=None,
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start_line=None):
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if start_line is not None:
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method, uri, version = start_line
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self.method = method
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self.uri = uri
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self.version = version
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self.headers = headers or HTTPHeaders()
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self.body = body or ""
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# set remote IP and protocol
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context = getattr(connection, 'context', None)
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self.remote_ip = getattr(context, 'remote_ip', None)
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self.protocol = getattr(context, 'protocol', "http")
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self.host = host or self.headers.get("Host") or "127.0.0.1"
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self.files = files or {}
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self.connection = connection
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self._start_time = time.time()
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self._finish_time = None
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self.path, sep, self.query = uri.partition('?')
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self.arguments = parse_qs_bytes(self.query, keep_blank_values=True)
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self.query_arguments = copy.deepcopy(self.arguments)
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self.body_arguments = {}
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def supports_http_1_1(self):
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"""Returns True if this request supports HTTP/1.1 semantics.
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.. deprecated:: 4.0
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Applications are less likely to need this information with the
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introduction of `.HTTPConnection`. If you still need it, access
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the ``version`` attribute directly.
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"""
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return self.version == "HTTP/1.1"
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@property
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def cookies(self):
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"""A dictionary of Cookie.Morsel objects."""
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if not hasattr(self, "_cookies"):
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self._cookies = Cookie.SimpleCookie()
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if "Cookie" in self.headers:
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try:
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self._cookies.load(
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native_str(self.headers["Cookie"]))
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except Exception:
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self._cookies = {}
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return self._cookies
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def write(self, chunk, callback=None):
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"""Writes the given chunk to the response stream.
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.. deprecated:: 4.0
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Use ``request.connection`` and the `.HTTPConnection` methods
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to write the response.
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"""
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assert isinstance(chunk, bytes)
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self.connection.write(chunk, callback=callback)
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def finish(self):
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"""Finishes this HTTP request on the open connection.
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.. deprecated:: 4.0
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Use ``request.connection`` and the `.HTTPConnection` methods
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to write the response.
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"""
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self.connection.finish()
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self._finish_time = time.time()
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def full_url(self):
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"""Reconstructs the full URL for this request."""
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return self.protocol + "://" + self.host + self.uri
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def request_time(self):
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"""Returns the amount of time it took for this request to execute."""
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if self._finish_time is None:
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return time.time() - self._start_time
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else:
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return self._finish_time - self._start_time
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def get_ssl_certificate(self, binary_form=False):
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"""Returns the client's SSL certificate, if any.
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To use client certificates, the HTTPServer must have been constructed
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with cert_reqs set in ssl_options, e.g.::
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server = HTTPServer(app,
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ssl_options=dict(
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certfile="foo.crt",
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keyfile="foo.key",
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cert_reqs=ssl.CERT_REQUIRED,
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ca_certs="cacert.crt"))
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By default, the return value is a dictionary (or None, if no
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client certificate is present). If ``binary_form`` is true, a
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DER-encoded form of the certificate is returned instead. See
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SSLSocket.getpeercert() in the standard library for more
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details.
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http://docs.python.org/library/ssl.html#sslsocket-objects
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"""
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try:
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return self.connection.stream.socket.getpeercert(
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binary_form=binary_form)
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except SSLError:
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return None
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def _parse_body(self):
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parse_body_arguments(
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self.headers.get("Content-Type", ""), self.body,
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self.body_arguments, self.files,
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self.headers)
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for k, v in self.body_arguments.items():
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self.arguments.setdefault(k, []).extend(v)
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def __repr__(self):
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attrs = ("protocol", "host", "method", "uri", "version", "remote_ip")
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args = ", ".join(["%s=%r" % (n, getattr(self, n)) for n in attrs])
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return "%s(%s, headers=%s)" % (
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self.__class__.__name__, args, dict(self.headers))
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class HTTPInputError(Exception):
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"""Exception class for malformed HTTP requests or responses
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from remote sources.
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.. versionadded:: 4.0
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"""
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pass
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class HTTPOutputError(Exception):
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"""Exception class for errors in HTTP output.
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.. versionadded:: 4.0
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"""
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pass
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class HTTPServerConnectionDelegate(object):
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"""Implement this interface to handle requests from `.HTTPServer`.
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.. versionadded:: 4.0
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"""
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def start_request(self, server_conn, request_conn):
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"""This method is called by the server when a new request has started.
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:arg server_conn: is an opaque object representing the long-lived
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(e.g. tcp-level) connection.
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:arg request_conn: is a `.HTTPConnection` object for a single
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request/response exchange.
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This method should return a `.HTTPMessageDelegate`.
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"""
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raise NotImplementedError()
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def on_close(self, server_conn):
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"""This method is called when a connection has been closed.
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:arg server_conn: is a server connection that has previously been
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passed to ``start_request``.
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"""
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pass
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class HTTPMessageDelegate(object):
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"""Implement this interface to handle an HTTP request or response.
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.. versionadded:: 4.0
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"""
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def headers_received(self, start_line, headers):
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"""Called when the HTTP headers have been received and parsed.
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:arg start_line: a `.RequestStartLine` or `.ResponseStartLine`
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depending on whether this is a client or server message.
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:arg headers: a `.HTTPHeaders` instance.
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Some `.HTTPConnection` methods can only be called during
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``headers_received``.
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May return a `.Future`; if it does the body will not be read
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until it is done.
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"""
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pass
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def data_received(self, chunk):
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"""Called when a chunk of data has been received.
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May return a `.Future` for flow control.
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"""
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pass
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def finish(self):
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"""Called after the last chunk of data has been received."""
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pass
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def on_connection_close(self):
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"""Called if the connection is closed without finishing the request.
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If ``headers_received`` is called, either ``finish`` or
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``on_connection_close`` will be called, but not both.
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"""
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pass
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class HTTPConnection(object):
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"""Applications use this interface to write their responses.
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.. versionadded:: 4.0
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"""
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def write_headers(self, start_line, headers, chunk=None, callback=None):
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"""Write an HTTP header block.
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:arg start_line: a `.RequestStartLine` or `.ResponseStartLine`.
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:arg headers: a `.HTTPHeaders` instance.
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:arg chunk: the first (optional) chunk of data. This is an optimization
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so that small responses can be written in the same call as their
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headers.
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:arg callback: a callback to be run when the write is complete.
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Returns a `.Future` if no callback is given.
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"""
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raise NotImplementedError()
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def write(self, chunk, callback=None):
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"""Writes a chunk of body data.
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The callback will be run when the write is complete. If no callback
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is given, returns a Future.
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"""
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raise NotImplementedError()
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def finish(self):
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"""Indicates that the last body data has been written.
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"""
|
|
raise NotImplementedError()
|
|
|
|
|
|
def url_concat(url, args):
|
|
"""Concatenate url and arguments regardless of whether
|
|
url has existing query parameters.
|
|
|
|
``args`` may be either a dictionary or a list of key-value pairs
|
|
(the latter allows for multiple values with the same key.
|
|
|
|
>>> url_concat("http://example.com/foo", dict(c="d"))
|
|
'http://example.com/foo?c=d'
|
|
>>> url_concat("http://example.com/foo?a=b", dict(c="d"))
|
|
'http://example.com/foo?a=b&c=d'
|
|
>>> url_concat("http://example.com/foo?a=b", [("c", "d"), ("c", "d2")])
|
|
'http://example.com/foo?a=b&c=d&c=d2'
|
|
"""
|
|
if not args:
|
|
return url
|
|
if url[-1] not in ('?', '&'):
|
|
url += '&' if ('?' in url) else '?'
|
|
return url + urlencode(args)
|
|
|
|
|
|
class HTTPFile(ObjectDict):
|
|
"""Represents a file uploaded via a form.
|
|
|
|
For backwards compatibility, its instance attributes are also
|
|
accessible as dictionary keys.
|
|
|
|
* ``filename``
|
|
* ``body``
|
|
* ``content_type``
|
|
"""
|
|
pass
|
|
|
|
|
|
def _parse_request_range(range_header):
|
|
"""Parses a Range header.
|
|
|
|
Returns either ``None`` or tuple ``(start, end)``.
|
|
Note that while the HTTP headers use inclusive byte positions,
|
|
this method returns indexes suitable for use in slices.
|
|
|
|
>>> start, end = _parse_request_range("bytes=1-2")
|
|
>>> start, end
|
|
(1, 3)
|
|
>>> [0, 1, 2, 3, 4][start:end]
|
|
[1, 2]
|
|
>>> _parse_request_range("bytes=6-")
|
|
(6, None)
|
|
>>> _parse_request_range("bytes=-6")
|
|
(-6, None)
|
|
>>> _parse_request_range("bytes=-0")
|
|
(None, 0)
|
|
>>> _parse_request_range("bytes=")
|
|
(None, None)
|
|
>>> _parse_request_range("foo=42")
|
|
>>> _parse_request_range("bytes=1-2,6-10")
|
|
|
|
Note: only supports one range (ex, ``bytes=1-2,6-10`` is not allowed).
|
|
|
|
See [0] for the details of the range header.
|
|
|
|
[0]: http://greenbytes.de/tech/webdav/draft-ietf-httpbis-p5-range-latest.html#byte.ranges
|
|
"""
|
|
unit, _, value = range_header.partition("=")
|
|
unit, value = unit.strip(), value.strip()
|
|
if unit != "bytes":
|
|
return None
|
|
start_b, _, end_b = value.partition("-")
|
|
try:
|
|
start = _int_or_none(start_b)
|
|
end = _int_or_none(end_b)
|
|
except ValueError:
|
|
return None
|
|
if end is not None:
|
|
if start is None:
|
|
if end != 0:
|
|
start = -end
|
|
end = None
|
|
else:
|
|
end += 1
|
|
return (start, end)
|
|
|
|
|
|
def _get_content_range(start, end, total):
|
|
"""Returns a suitable Content-Range header:
|
|
|
|
>>> print(_get_content_range(None, 1, 4))
|
|
bytes 0-0/4
|
|
>>> print(_get_content_range(1, 3, 4))
|
|
bytes 1-2/4
|
|
>>> print(_get_content_range(None, None, 4))
|
|
bytes 0-3/4
|
|
"""
|
|
start = start or 0
|
|
end = (end or total) - 1
|
|
return "bytes %s-%s/%s" % (start, end, total)
|
|
|
|
|
|
def _int_or_none(val):
|
|
val = val.strip()
|
|
if val == "":
|
|
return None
|
|
return int(val)
|
|
|
|
|
|
def parse_body_arguments(content_type, body, arguments, files, headers=None):
|
|
"""Parses a form request body.
|
|
|
|
Supports ``application/x-www-form-urlencoded`` and
|
|
``multipart/form-data``. The ``content_type`` parameter should be
|
|
a string and ``body`` should be a byte string. The ``arguments``
|
|
and ``files`` parameters are dictionaries that will be updated
|
|
with the parsed contents.
|
|
"""
|
|
if headers and 'Content-Encoding' in headers:
|
|
gen_log.warning("Unsupported Content-Encoding: %s",
|
|
headers['Content-Encoding'])
|
|
return
|
|
if content_type.startswith("application/x-www-form-urlencoded"):
|
|
try:
|
|
uri_arguments = parse_qs_bytes(native_str(body), keep_blank_values=True)
|
|
except Exception as e:
|
|
gen_log.warning('Invalid x-www-form-urlencoded body: %s', e)
|
|
uri_arguments = {}
|
|
for name, values in uri_arguments.items():
|
|
if values:
|
|
arguments.setdefault(name, []).extend(values)
|
|
elif content_type.startswith("multipart/form-data"):
|
|
fields = content_type.split(";")
|
|
for field in fields:
|
|
k, sep, v = field.strip().partition("=")
|
|
if k == "boundary" and v:
|
|
parse_multipart_form_data(utf8(v), body, arguments, files)
|
|
break
|
|
else:
|
|
gen_log.warning("Invalid multipart/form-data")
|
|
|
|
|
|
def parse_multipart_form_data(boundary, data, arguments, files):
|
|
"""Parses a ``multipart/form-data`` body.
|
|
|
|
The ``boundary`` and ``data`` parameters are both byte strings.
|
|
The dictionaries given in the arguments and files parameters
|
|
will be updated with the contents of the body.
|
|
"""
|
|
# The standard allows for the boundary to be quoted in the header,
|
|
# although it's rare (it happens at least for google app engine
|
|
# xmpp). I think we're also supposed to handle backslash-escapes
|
|
# here but I'll save that until we see a client that uses them
|
|
# in the wild.
|
|
if boundary.startswith(b'"') and boundary.endswith(b'"'):
|
|
boundary = boundary[1:-1]
|
|
final_boundary_index = data.rfind(b"--" + boundary + b"--")
|
|
if final_boundary_index == -1:
|
|
gen_log.warning("Invalid multipart/form-data: no final boundary")
|
|
return
|
|
parts = data[:final_boundary_index].split(b"--" + boundary + b"\r\n")
|
|
for part in parts:
|
|
if not part:
|
|
continue
|
|
eoh = part.find(b"\r\n\r\n")
|
|
if eoh == -1:
|
|
gen_log.warning("multipart/form-data missing headers")
|
|
continue
|
|
headers = HTTPHeaders.parse(part[:eoh].decode("utf-8"))
|
|
disp_header = headers.get("Content-Disposition", "")
|
|
disposition, disp_params = _parse_header(disp_header)
|
|
if disposition != "form-data" or not part.endswith(b"\r\n"):
|
|
gen_log.warning("Invalid multipart/form-data")
|
|
continue
|
|
value = part[eoh + 4:-2]
|
|
if not disp_params.get("name"):
|
|
gen_log.warning("multipart/form-data value missing name")
|
|
continue
|
|
name = disp_params["name"]
|
|
if disp_params.get("filename"):
|
|
ctype = headers.get("Content-Type", "application/unknown")
|
|
files.setdefault(name, []).append(HTTPFile(
|
|
filename=disp_params["filename"], body=value,
|
|
content_type=ctype))
|
|
else:
|
|
arguments.setdefault(name, []).append(value)
|
|
|
|
|
|
def format_timestamp(ts):
|
|
"""Formats a timestamp in the format used by HTTP.
|
|
|
|
The argument may be a numeric timestamp as returned by `time.time`,
|
|
a time tuple as returned by `time.gmtime`, or a `datetime.datetime`
|
|
object.
|
|
|
|
>>> format_timestamp(1359312200)
|
|
'Sun, 27 Jan 2013 18:43:20 GMT'
|
|
"""
|
|
if isinstance(ts, numbers.Real):
|
|
pass
|
|
elif isinstance(ts, (tuple, time.struct_time)):
|
|
ts = calendar.timegm(ts)
|
|
elif isinstance(ts, datetime.datetime):
|
|
ts = calendar.timegm(ts.utctimetuple())
|
|
else:
|
|
raise TypeError("unknown timestamp type: %r" % ts)
|
|
return email.utils.formatdate(ts, usegmt=True)
|
|
|
|
|
|
RequestStartLine = collections.namedtuple(
|
|
'RequestStartLine', ['method', 'path', 'version'])
|
|
|
|
|
|
def parse_request_start_line(line):
|
|
"""Returns a (method, path, version) tuple for an HTTP 1.x request line.
|
|
|
|
The response is a `collections.namedtuple`.
|
|
|
|
>>> parse_request_start_line("GET /foo HTTP/1.1")
|
|
RequestStartLine(method='GET', path='/foo', version='HTTP/1.1')
|
|
"""
|
|
try:
|
|
method, path, version = line.split(" ")
|
|
except ValueError:
|
|
raise HTTPInputError("Malformed HTTP request line")
|
|
if not version.startswith("HTTP/"):
|
|
raise HTTPInputError(
|
|
"Malformed HTTP version in HTTP Request-Line: %r" % version)
|
|
return RequestStartLine(method, path, version)
|
|
|
|
|
|
ResponseStartLine = collections.namedtuple(
|
|
'ResponseStartLine', ['version', 'code', 'reason'])
|
|
|
|
|
|
def parse_response_start_line(line):
|
|
"""Returns a (version, code, reason) tuple for an HTTP 1.x response line.
|
|
|
|
The response is a `collections.namedtuple`.
|
|
|
|
>>> parse_response_start_line("HTTP/1.1 200 OK")
|
|
ResponseStartLine(version='HTTP/1.1', code=200, reason='OK')
|
|
"""
|
|
line = native_str(line)
|
|
match = re.match("(HTTP/1.[01]) ([0-9]+) ([^\r]*)", line)
|
|
if not match:
|
|
raise HTTPInputError("Error parsing response start line")
|
|
return ResponseStartLine(match.group(1), int(match.group(2)),
|
|
match.group(3))
|
|
|
|
# _parseparam and _parse_header are copied and modified from python2.7's cgi.py
|
|
# The original 2.7 version of this code did not correctly support some
|
|
# combinations of semicolons and double quotes.
|
|
# It has also been modified to support valueless parameters as seen in
|
|
# websocket extension negotiations.
|
|
|
|
|
|
def _parseparam(s):
|
|
while s[:1] == ';':
|
|
s = s[1:]
|
|
end = s.find(';')
|
|
while end > 0 and (s.count('"', 0, end) - s.count('\\"', 0, end)) % 2:
|
|
end = s.find(';', end + 1)
|
|
if end < 0:
|
|
end = len(s)
|
|
f = s[:end]
|
|
yield f.strip()
|
|
s = s[end:]
|
|
|
|
|
|
def _parse_header(line):
|
|
"""Parse a Content-type like header.
|
|
|
|
Return the main content-type and a dictionary of options.
|
|
|
|
"""
|
|
parts = _parseparam(';' + line)
|
|
key = next(parts)
|
|
pdict = {}
|
|
for p in parts:
|
|
i = p.find('=')
|
|
if i >= 0:
|
|
name = p[:i].strip().lower()
|
|
value = p[i + 1:].strip()
|
|
if len(value) >= 2 and value[0] == value[-1] == '"':
|
|
value = value[1:-1]
|
|
value = value.replace('\\\\', '\\').replace('\\"', '"')
|
|
pdict[name] = value
|
|
else:
|
|
pdict[p] = None
|
|
return key, pdict
|
|
|
|
|
|
def _encode_header(key, pdict):
|
|
"""Inverse of _parse_header.
|
|
|
|
>>> _encode_header('permessage-deflate',
|
|
... {'client_max_window_bits': 15, 'client_no_context_takeover': None})
|
|
'permessage-deflate; client_max_window_bits=15; client_no_context_takeover'
|
|
"""
|
|
if not pdict:
|
|
return key
|
|
out = [key]
|
|
# Sort the parameters just to make it easy to test.
|
|
for k, v in sorted(pdict.items()):
|
|
if v is None:
|
|
out.append(k)
|
|
else:
|
|
# TODO: quote if necessary.
|
|
out.append('%s=%s' % (k, v))
|
|
return '; '.join(out)
|
|
|
|
|
|
def doctests():
|
|
import doctest
|
|
return doctest.DocTestSuite()
|