99 lines
3.1 KiB
Python
99 lines
3.1 KiB
Python
# Copyright 2013 by Rackspace Hosting, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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def normalize_headers(env):
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"""Normalize HTTP headers in an WSGI environ dictionary.
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Args:
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env: A WSGI environ dictionary to normalize (in-place)
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Raises:
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KeyError: The env dictionary did not contain a key that is required by
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PEP-333.
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TypeError: env is not dictionary-like. In other words, it has no
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attribute '__getitem__'.
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"""
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# NOTE(kgriffs): Per the WSGI spec, HOST, Content-Type, and
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# CONTENT_LENGTH are not under HTTP_* and so we normalize
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# that here.
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if 'CONTENT_TYPE' in env:
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env['HTTP_CONTENT_TYPE'] = env['CONTENT_TYPE']
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if 'CONTENT_LENGTH' in env:
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env['HTTP_CONTENT_LENGTH'] = env['CONTENT_LENGTH']
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# Fallback to SERVER_* vars if the Host header isn't specified
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if 'HTTP_HOST' not in env:
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host = env['SERVER_NAME']
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port = env['SERVER_PORT']
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if port != '80':
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host = ''.join([host, ':', port])
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env['HTTP_HOST'] = host
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class Body(object):
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"""Wrap wsgi.input streams to make them more robust.
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The socket._fileobject and io.BufferedReader are sometimes used
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to implement wsgi.input. However, app developers are often burned
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by the fact that the read() method for these objects block
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indefinitely if either no size is passed, or a size greater than
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the request's content length is passed to the method.
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This class normalizes wsgi.input behavior between WSGI servers
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by implementing non-blocking behavior for the cases mentioned
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above.
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"""
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def __init__(self, stream, stream_len):
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"""Initialize the request body instance.
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Args:
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stream: Instance of socket._fileobject from environ['wsgi.input']
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stream_len: Expected content length of the stream.
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"""
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self.stream = stream
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self.stream_len = stream_len
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def _make_stream_reader(func):
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def read(size=None):
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if size is None or size > self.stream_len:
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size = self.stream_len
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return func(size)
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return read
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# NOTE(kgriffs): All of the wrapped methods take a single argument,
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# which is a size AKA length AKA limit, always in bytes/characters.
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# This is consistent with Gunicorn's "Body" class.
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for attr in ('read', 'readline', 'readlines'):
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target = getattr(self.stream, attr)
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setattr(self, attr, _make_stream_reader(target))
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def __iter__(self):
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return self
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def __next__(self):
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return next(self.stream)
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next = __next__
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