329 lines
10 KiB
Python
329 lines
10 KiB
Python
from __future__ import absolute_import
|
|
try:
|
|
from collections.abc import Mapping, MutableMapping
|
|
except ImportError:
|
|
from collections import Mapping, MutableMapping
|
|
try:
|
|
from threading import RLock
|
|
except ImportError: # Platform-specific: No threads available
|
|
class RLock:
|
|
def __enter__(self):
|
|
pass
|
|
|
|
def __exit__(self, exc_type, exc_value, traceback):
|
|
pass
|
|
|
|
|
|
from collections import OrderedDict
|
|
from .exceptions import InvalidHeader
|
|
from .packages.six import iterkeys, itervalues, PY3
|
|
|
|
|
|
__all__ = ['RecentlyUsedContainer', 'HTTPHeaderDict']
|
|
|
|
|
|
_Null = object()
|
|
|
|
|
|
class RecentlyUsedContainer(MutableMapping):
|
|
"""
|
|
Provides a thread-safe dict-like container which maintains up to
|
|
``maxsize`` keys while throwing away the least-recently-used keys beyond
|
|
``maxsize``.
|
|
|
|
:param maxsize:
|
|
Maximum number of recent elements to retain.
|
|
|
|
:param dispose_func:
|
|
Every time an item is evicted from the container,
|
|
``dispose_func(value)`` is called. Callback which will get called
|
|
"""
|
|
|
|
ContainerCls = OrderedDict
|
|
|
|
def __init__(self, maxsize=10, dispose_func=None):
|
|
self._maxsize = maxsize
|
|
self.dispose_func = dispose_func
|
|
|
|
self._container = self.ContainerCls()
|
|
self.lock = RLock()
|
|
|
|
def __getitem__(self, key):
|
|
# Re-insert the item, moving it to the end of the eviction line.
|
|
with self.lock:
|
|
item = self._container.pop(key)
|
|
self._container[key] = item
|
|
return item
|
|
|
|
def __setitem__(self, key, value):
|
|
evicted_value = _Null
|
|
with self.lock:
|
|
# Possibly evict the existing value of 'key'
|
|
evicted_value = self._container.get(key, _Null)
|
|
self._container[key] = value
|
|
|
|
# If we didn't evict an existing value, we might have to evict the
|
|
# least recently used item from the beginning of the container.
|
|
if len(self._container) > self._maxsize:
|
|
_key, evicted_value = self._container.popitem(last=False)
|
|
|
|
if self.dispose_func and evicted_value is not _Null:
|
|
self.dispose_func(evicted_value)
|
|
|
|
def __delitem__(self, key):
|
|
with self.lock:
|
|
value = self._container.pop(key)
|
|
|
|
if self.dispose_func:
|
|
self.dispose_func(value)
|
|
|
|
def __len__(self):
|
|
with self.lock:
|
|
return len(self._container)
|
|
|
|
def __iter__(self):
|
|
raise NotImplementedError('Iteration over this class is unlikely to be threadsafe.')
|
|
|
|
def clear(self):
|
|
with self.lock:
|
|
# Copy pointers to all values, then wipe the mapping
|
|
values = list(itervalues(self._container))
|
|
self._container.clear()
|
|
|
|
if self.dispose_func:
|
|
for value in values:
|
|
self.dispose_func(value)
|
|
|
|
def keys(self):
|
|
with self.lock:
|
|
return list(iterkeys(self._container))
|
|
|
|
|
|
class HTTPHeaderDict(MutableMapping):
|
|
"""
|
|
:param headers:
|
|
An iterable of field-value pairs. Must not contain multiple field names
|
|
when compared case-insensitively.
|
|
|
|
:param kwargs:
|
|
Additional field-value pairs to pass in to ``dict.update``.
|
|
|
|
A ``dict`` like container for storing HTTP Headers.
|
|
|
|
Field names are stored and compared case-insensitively in compliance with
|
|
RFC 7230. Iteration provides the first case-sensitive key seen for each
|
|
case-insensitive pair.
|
|
|
|
Using ``__setitem__`` syntax overwrites fields that compare equal
|
|
case-insensitively in order to maintain ``dict``'s api. For fields that
|
|
compare equal, instead create a new ``HTTPHeaderDict`` and use ``.add``
|
|
in a loop.
|
|
|
|
If multiple fields that are equal case-insensitively are passed to the
|
|
constructor or ``.update``, the behavior is undefined and some will be
|
|
lost.
|
|
|
|
>>> headers = HTTPHeaderDict()
|
|
>>> headers.add('Set-Cookie', 'foo=bar')
|
|
>>> headers.add('set-cookie', 'baz=quxx')
|
|
>>> headers['content-length'] = '7'
|
|
>>> headers['SET-cookie']
|
|
'foo=bar, baz=quxx'
|
|
>>> headers['Content-Length']
|
|
'7'
|
|
"""
|
|
|
|
def __init__(self, headers=None, **kwargs):
|
|
super(HTTPHeaderDict, self).__init__()
|
|
self._container = OrderedDict()
|
|
if headers is not None:
|
|
if isinstance(headers, HTTPHeaderDict):
|
|
self._copy_from(headers)
|
|
else:
|
|
self.extend(headers)
|
|
if kwargs:
|
|
self.extend(kwargs)
|
|
|
|
def __setitem__(self, key, val):
|
|
self._container[key.lower()] = [key, val]
|
|
return self._container[key.lower()]
|
|
|
|
def __getitem__(self, key):
|
|
val = self._container[key.lower()]
|
|
return ', '.join(val[1:])
|
|
|
|
def __delitem__(self, key):
|
|
del self._container[key.lower()]
|
|
|
|
def __contains__(self, key):
|
|
return key.lower() in self._container
|
|
|
|
def __eq__(self, other):
|
|
if not isinstance(other, Mapping) and not hasattr(other, 'keys'):
|
|
return False
|
|
if not isinstance(other, type(self)):
|
|
other = type(self)(other)
|
|
return (dict((k.lower(), v) for k, v in self.itermerged()) ==
|
|
dict((k.lower(), v) for k, v in other.itermerged()))
|
|
|
|
def __ne__(self, other):
|
|
return not self.__eq__(other)
|
|
|
|
if not PY3: # Python 2
|
|
iterkeys = MutableMapping.iterkeys
|
|
itervalues = MutableMapping.itervalues
|
|
|
|
__marker = object()
|
|
|
|
def __len__(self):
|
|
return len(self._container)
|
|
|
|
def __iter__(self):
|
|
# Only provide the originally cased names
|
|
for vals in self._container.values():
|
|
yield vals[0]
|
|
|
|
def pop(self, key, default=__marker):
|
|
'''D.pop(k[,d]) -> v, remove specified key and return the corresponding value.
|
|
If key is not found, d is returned if given, otherwise KeyError is raised.
|
|
'''
|
|
# Using the MutableMapping function directly fails due to the private marker.
|
|
# Using ordinary dict.pop would expose the internal structures.
|
|
# So let's reinvent the wheel.
|
|
try:
|
|
value = self[key]
|
|
except KeyError:
|
|
if default is self.__marker:
|
|
raise
|
|
return default
|
|
else:
|
|
del self[key]
|
|
return value
|
|
|
|
def discard(self, key):
|
|
try:
|
|
del self[key]
|
|
except KeyError:
|
|
pass
|
|
|
|
def add(self, key, val):
|
|
"""Adds a (name, value) pair, doesn't overwrite the value if it already
|
|
exists.
|
|
|
|
>>> headers = HTTPHeaderDict(foo='bar')
|
|
>>> headers.add('Foo', 'baz')
|
|
>>> headers['foo']
|
|
'bar, baz'
|
|
"""
|
|
key_lower = key.lower()
|
|
new_vals = [key, val]
|
|
# Keep the common case aka no item present as fast as possible
|
|
vals = self._container.setdefault(key_lower, new_vals)
|
|
if new_vals is not vals:
|
|
vals.append(val)
|
|
|
|
def extend(self, *args, **kwargs):
|
|
"""Generic import function for any type of header-like object.
|
|
Adapted version of MutableMapping.update in order to insert items
|
|
with self.add instead of self.__setitem__
|
|
"""
|
|
if len(args) > 1:
|
|
raise TypeError("extend() takes at most 1 positional "
|
|
"arguments ({0} given)".format(len(args)))
|
|
other = args[0] if len(args) >= 1 else ()
|
|
|
|
if isinstance(other, HTTPHeaderDict):
|
|
for key, val in other.iteritems():
|
|
self.add(key, val)
|
|
elif isinstance(other, Mapping):
|
|
for key in other:
|
|
self.add(key, other[key])
|
|
elif hasattr(other, "keys"):
|
|
for key in other.keys():
|
|
self.add(key, other[key])
|
|
else:
|
|
for key, value in other:
|
|
self.add(key, value)
|
|
|
|
for key, value in kwargs.items():
|
|
self.add(key, value)
|
|
|
|
def getlist(self, key, default=__marker):
|
|
"""Returns a list of all the values for the named field. Returns an
|
|
empty list if the key doesn't exist."""
|
|
try:
|
|
vals = self._container[key.lower()]
|
|
except KeyError:
|
|
if default is self.__marker:
|
|
return []
|
|
return default
|
|
else:
|
|
return vals[1:]
|
|
|
|
# Backwards compatibility for httplib
|
|
getheaders = getlist
|
|
getallmatchingheaders = getlist
|
|
iget = getlist
|
|
|
|
# Backwards compatibility for http.cookiejar
|
|
get_all = getlist
|
|
|
|
def __repr__(self):
|
|
return "%s(%s)" % (type(self).__name__, dict(self.itermerged()))
|
|
|
|
def _copy_from(self, other):
|
|
for key in other:
|
|
val = other.getlist(key)
|
|
if isinstance(val, list):
|
|
# Don't need to convert tuples
|
|
val = list(val)
|
|
self._container[key.lower()] = [key] + val
|
|
|
|
def copy(self):
|
|
clone = type(self)()
|
|
clone._copy_from(self)
|
|
return clone
|
|
|
|
def iteritems(self):
|
|
"""Iterate over all header lines, including duplicate ones."""
|
|
for key in self:
|
|
vals = self._container[key.lower()]
|
|
for val in vals[1:]:
|
|
yield vals[0], val
|
|
|
|
def itermerged(self):
|
|
"""Iterate over all headers, merging duplicate ones together."""
|
|
for key in self:
|
|
val = self._container[key.lower()]
|
|
yield val[0], ', '.join(val[1:])
|
|
|
|
def items(self):
|
|
return list(self.iteritems())
|
|
|
|
@classmethod
|
|
def from_httplib(cls, message): # Python 2
|
|
"""Read headers from a Python 2 httplib message object."""
|
|
# python2.7 does not expose a proper API for exporting multiheaders
|
|
# efficiently. This function re-reads raw lines from the message
|
|
# object and extracts the multiheaders properly.
|
|
obs_fold_continued_leaders = (' ', '\t')
|
|
headers = []
|
|
|
|
for line in message.headers:
|
|
if line.startswith(obs_fold_continued_leaders):
|
|
if not headers:
|
|
# We received a header line that starts with OWS as described
|
|
# in RFC-7230 S3.2.4. This indicates a multiline header, but
|
|
# there exists no previous header to which we can attach it.
|
|
raise InvalidHeader(
|
|
'Header continuation with no previous header: %s' % line
|
|
)
|
|
else:
|
|
key, value = headers[-1]
|
|
headers[-1] = (key, value + ' ' + line.strip())
|
|
continue
|
|
|
|
key, value = line.split(':', 1)
|
|
headers.append((key, value.strip()))
|
|
|
|
return cls(headers)
|