This file is indexed.

/usr/lib/python2.7/dist-packages/kombu/serialization.py is in python-kombu 3.0.35-1.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
"""
kombu.serialization
===================

Serialization utilities.

"""
from __future__ import absolute_import

import codecs
import os
import sys

import pickle as pypickle
try:
    import cPickle as cpickle
except ImportError:  # pragma: no cover
    cpickle = None  # noqa

from collections import namedtuple
from contextlib import contextmanager

from .exceptions import (
    ContentDisallowed, DecodeError, EncodeError, SerializerNotInstalled
)
from .five import BytesIO, reraise, text_t
from .utils import entrypoints
from .utils.encoding import str_to_bytes, bytes_t

__all__ = ['pickle', 'loads', 'dumps', 'register', 'unregister']
SKIP_DECODE = frozenset(['binary', 'ascii-8bit'])
TRUSTED_CONTENT = frozenset(['application/data', 'application/text'])

if sys.platform.startswith('java'):  # pragma: no cover

    def _decode(t, coding):
        return codecs.getdecoder(coding)(t)[0]
else:
    _decode = codecs.decode

pickle = cpickle or pypickle
pickle_load = pickle.load

#: Kombu requires Python 2.5 or later so we use protocol 2 by default.
#: There's a new protocol (3) but this is only supported by Python 3.
pickle_protocol = int(os.environ.get('PICKLE_PROTOCOL', 2))

codec = namedtuple('codec', ('content_type', 'content_encoding', 'encoder'))


@contextmanager
def _reraise_errors(wrapper,
                    include=(Exception, ), exclude=(SerializerNotInstalled, )):
    try:
        yield
    except exclude:
        raise
    except include as exc:
        reraise(wrapper, wrapper(exc), sys.exc_info()[2])


def pickle_loads(s, load=pickle_load):
    # used to support buffer objects
    return load(BytesIO(s))


def parenthesize_alias(first, second):
    return '%s (%s)' % (first, second) if first else second


class SerializerRegistry(object):
    """The registry keeps track of serialization methods."""

    def __init__(self):
        self._encoders = {}
        self._decoders = {}
        self._default_encode = None
        self._default_content_type = None
        self._default_content_encoding = None
        self._disabled_content_types = set()
        self.type_to_name = {}
        self.name_to_type = {}

    def register(self, name, encoder, decoder, content_type,
                 content_encoding='utf-8'):
        if encoder:
            self._encoders[name] = codec(
                content_type, content_encoding, encoder,
            )
        if decoder:
            self._decoders[content_type] = decoder
        self.type_to_name[content_type] = name
        self.name_to_type[name] = content_type

    def enable(self, name):
        if '/' not in name:
            name = self.name_to_type[name]
        self._disabled_content_types.discard(name)

    def disable(self, name):
        if '/' not in name:
            name = self.name_to_type[name]
        self._disabled_content_types.add(name)

    def unregister(self, name):
        try:
            content_type = self.name_to_type[name]
            self._decoders.pop(content_type, None)
            self._encoders.pop(name, None)
            self.type_to_name.pop(content_type, None)
            self.name_to_type.pop(name, None)
        except KeyError:
            raise SerializerNotInstalled(
                'No encoder/decoder installed for {0}'.format(name))

    def _set_default_serializer(self, name):
        """
        Set the default serialization method used by this library.

        :param name: The name of the registered serialization method.
            For example, `json` (default), `pickle`, `yaml`, `msgpack`,
            or any custom methods registered using :meth:`register`.

        :raises SerializerNotInstalled: If the serialization method
            requested is not available.
        """
        try:
            (self._default_content_type, self._default_content_encoding,
             self._default_encode) = self._encoders[name]
        except KeyError:
            raise SerializerNotInstalled(
                'No encoder installed for {0}'.format(name))

    def dumps(self, data, serializer=None):
        if serializer == 'raw':
            return raw_encode(data)
        if serializer and not self._encoders.get(serializer):
            raise SerializerNotInstalled(
                'No encoder installed for {0}'.format(serializer))

        # If a raw string was sent, assume binary encoding
        # (it's likely either ASCII or a raw binary file, and a character
        # set of 'binary' will encompass both, even if not ideal.
        if not serializer and isinstance(data, bytes_t):
            # In Python 3+, this would be "bytes"; allow binary data to be
            # sent as a message without getting encoder errors
            return 'application/data', 'binary', data

        # For Unicode objects, force it into a string
        if not serializer and isinstance(data, text_t):
            with _reraise_errors(EncodeError, exclude=()):
                payload = data.encode('utf-8')
            return 'text/plain', 'utf-8', payload

        if serializer:
            content_type, content_encoding, encoder = \
                self._encoders[serializer]
        else:
            encoder = self._default_encode
            content_type = self._default_content_type
            content_encoding = self._default_content_encoding

        with _reraise_errors(EncodeError):
            payload = encoder(data)
        return content_type, content_encoding, payload
    encode = dumps  # XXX compat

    def loads(self, data, content_type, content_encoding,
              accept=None, force=False, _trusted_content=TRUSTED_CONTENT):
        content_type = content_type or 'application/data'
        if accept is not None:
            if content_type not in _trusted_content \
                    and content_type not in accept:
                raise self._for_untrusted_content(content_type, 'untrusted')
        else:
            if content_type in self._disabled_content_types and not force:
                raise self._for_untrusted_content(content_type, 'disabled')
        content_encoding = (content_encoding or 'utf-8').lower()

        if data:
            decode = self._decoders.get(content_type)
            if decode:
                with _reraise_errors(DecodeError):
                    return decode(data)
            if content_encoding not in SKIP_DECODE and \
                    not isinstance(data, text_t):
                with _reraise_errors(DecodeError):
                    return _decode(data, content_encoding)
        return data
    decode = loads  # XXX compat

    def _for_untrusted_content(self, ctype, why):
        return ContentDisallowed(
            'Refusing to deserialize {0} content of type {1}'.format(
                why,
                parenthesize_alias(self.type_to_name.get(ctype, ctype), ctype),
            ),
        )


#: Global registry of serializers/deserializers.
registry = SerializerRegistry()


"""
.. function:: dumps(data, serializer=default_serializer)

    Serialize a data structure into a string suitable for sending
    as an AMQP message body.

    :param data: The message data to send. Can be a list,
        dictionary or a string.

    :keyword serializer: An optional string representing
        the serialization method you want the data marshalled
        into. (For example, `json`, `raw`, or `pickle`).

        If :const:`None` (default), then json will be used, unless
        `data` is a :class:`str` or :class:`unicode` object. In this
        latter case, no serialization occurs as it would be
        unnecessary.

        Note that if `serializer` is specified, then that
        serialization method will be used even if a :class:`str`
        or :class:`unicode` object is passed in.

    :returns: A three-item tuple containing the content type
        (e.g., `application/json`), content encoding, (e.g.,
        `utf-8`) and a string containing the serialized
        data.

    :raises SerializerNotInstalled: If the serialization method
            requested is not available.
"""
dumps = encode = registry.encode   # XXX encode is a compat alias

"""
.. function:: loads(data, content_type, content_encoding):

    Deserialize a data stream as serialized using `dumps`
    based on `content_type`.

    :param data: The message data to deserialize.

    :param content_type: The content-type of the data.
        (e.g., `application/json`).

    :param content_encoding: The content-encoding of the data.
        (e.g., `utf-8`, `binary`, or `us-ascii`).

    :returns: The unserialized data.

"""
loads = decode = registry.decode  # XXX decode is a compat alias


"""
.. function:: register(name, encoder, decoder, content_type,
                       content_encoding='utf-8'):
    Register a new encoder/decoder.

    :param name: A convenience name for the serialization method.

    :param encoder: A method that will be passed a python data structure
        and should return a string representing the serialized data.
        If :const:`None`, then only a decoder will be registered. Encoding
        will not be possible.

    :param decoder: A method that will be passed a string representing
        serialized data and should return a python data structure.
        If :const:`None`, then only an encoder will be registered.
        Decoding will not be possible.

    :param content_type: The mime-type describing the serialized
        structure.

    :param content_encoding: The content encoding (character set) that
        the `decoder` method will be returning. Will usually be
        `utf-8`, `us-ascii`, or `binary`.

"""
register = registry.register


"""
.. function:: unregister(name):
    Unregister registered encoder/decoder.

    :param name: Registered serialization method name.

"""
unregister = registry.unregister


def raw_encode(data):
    """Special case serializer."""
    content_type = 'application/data'
    payload = data
    if isinstance(payload, text_t):
        content_encoding = 'utf-8'
        with _reraise_errors(EncodeError, exclude=()):
            payload = payload.encode(content_encoding)
    else:
        content_encoding = 'binary'
    return content_type, content_encoding, payload


def register_json():
    """Register a encoder/decoder for JSON serialization."""
    from anyjson import loads as json_loads, dumps as json_dumps

    def _loads(obj):
        if isinstance(obj, bytes_t):
            obj = obj.decode('utf-8')
        return json_loads(obj)

    registry.register('json', json_dumps, _loads,
                      content_type='application/json',
                      content_encoding='utf-8')


def register_yaml():
    """Register a encoder/decoder for YAML serialization.

    It is slower than JSON, but allows for more data types
    to be serialized. Useful if you need to send data such as dates"""
    try:
        import yaml
        registry.register('yaml', yaml.safe_dump, yaml.safe_load,
                          content_type='application/x-yaml',
                          content_encoding='utf-8')
    except ImportError:

        def not_available(*args, **kwargs):
            """In case a client receives a yaml message, but yaml
            isn't installed."""
            raise SerializerNotInstalled(
                'No decoder installed for YAML. Install the PyYAML library')
        registry.register('yaml', None, not_available, 'application/x-yaml')


if sys.version_info[0] == 3:  # pragma: no cover

    def unpickle(s):
        return pickle_loads(str_to_bytes(s))

else:
    unpickle = pickle_loads  # noqa


def register_pickle():
    """The fastest serialization method, but restricts
    you to python clients."""

    def pickle_dumps(obj, dumper=pickle.dumps):
        return dumper(obj, protocol=pickle_protocol)

    registry.register('pickle', pickle_dumps, unpickle,
                      content_type='application/x-python-serialize',
                      content_encoding='binary')


def register_msgpack():
    """See http://msgpack.sourceforge.net/"""
    pack = unpack = None
    try:
        import msgpack
        if msgpack.version >= (0, 4):
            from msgpack import packb, unpackb

            def pack(s):
                return packb(s, use_bin_type=True)

            def unpack(s):
                return unpackb(s, encoding='utf-8')
        else:
            def version_mismatch(*args, **kwargs):
                raise SerializerNotInstalled(
                    'msgpack requires msgpack-python >= 0.4.0')
            pack = unpack = version_mismatch
    except (ImportError, ValueError):
        def not_available(*args, **kwargs):
            raise SerializerNotInstalled(
                'No decoder installed for msgpack. '
                'Please install the msgpack-python library')
        pack = unpack = not_available
    registry.register(
        'msgpack', pack, unpack,
        content_type='application/x-msgpack',
        content_encoding='binary',
    )

# Register the base serialization methods.
register_json()
register_pickle()
register_yaml()
register_msgpack()

# Default serializer is 'json'
registry._set_default_serializer('json')


_setupfuns = {
    'json': register_json,
    'pickle': register_pickle,
    'yaml': register_yaml,
    'msgpack': register_msgpack,
    'application/json': register_json,
    'application/x-yaml': register_yaml,
    'application/x-python-serialize': register_pickle,
    'application/x-msgpack': register_msgpack,
}


def enable_insecure_serializers(choices=['pickle', 'yaml', 'msgpack']):
    """Enable serializers that are considered to be unsafe.

    Will enable ``pickle``, ``yaml`` and ``msgpack`` by default,
    but you can also specify a list of serializers (by name or content type)
    to enable.

    """
    for choice in choices:
        try:
            registry.enable(choice)
        except KeyError:
            pass


def disable_insecure_serializers(allowed=['json']):
    """Disable untrusted serializers.

    Will disable all serializers except ``json``
    or you can specify a list of deserializers to allow.

    .. note::

        Producers will still be able to serialize data
        in these formats, but consumers will not accept
        incoming data using the untrusted content types.

    """
    for name in registry._decoders:
        registry.disable(name)
    if allowed is not None:
        for name in allowed:
            registry.enable(name)


# Insecure serializers are disabled by default since v3.0
disable_insecure_serializers()

# Load entrypoints from installed extensions
for ep, args in entrypoints('kombu.serializers'):  # pragma: no cover
    register(ep.name, *args)


def prepare_accept_content(l, name_to_type=registry.name_to_type):
    if l is not None:
        return set(n if '/' in n else name_to_type[n] for n in l)
    return l