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81 lines
2.3 KiB
81 lines
2.3 KiB
3 years ago
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import typing as _t
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import zlib
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from ._json import _CompactJSON
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from .encoding import base64_decode
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from .encoding import base64_encode
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from .exc import BadPayload
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from .serializer import Serializer
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from .timed import TimedSerializer
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class URLSafeSerializerMixin(Serializer):
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"""Mixed in with a regular serializer it will attempt to zlib
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compress the string to make it shorter if necessary. It will also
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base64 encode the string so that it can safely be placed in a URL.
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"""
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default_serializer = _CompactJSON
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def load_payload(
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self,
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payload: bytes,
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*args: _t.Any,
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serializer: _t.Optional[_t.Any] = None,
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**kwargs: _t.Any,
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) -> _t.Any:
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decompress = False
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if payload.startswith(b"."):
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payload = payload[1:]
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decompress = True
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try:
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json = base64_decode(payload)
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except Exception as e:
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raise BadPayload(
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"Could not base64 decode the payload because of an exception",
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original_error=e,
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)
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if decompress:
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try:
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json = zlib.decompress(json)
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except Exception as e:
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raise BadPayload(
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"Could not zlib decompress the payload before decoding the payload",
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original_error=e,
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)
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return super().load_payload(json, *args, **kwargs)
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def dump_payload(self, obj: _t.Any) -> bytes:
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json = super().dump_payload(obj)
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is_compressed = False
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compressed = zlib.compress(json)
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if len(compressed) < (len(json) - 1):
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json = compressed
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is_compressed = True
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base64d = base64_encode(json)
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if is_compressed:
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base64d = b"." + base64d
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return base64d
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class URLSafeSerializer(URLSafeSerializerMixin, Serializer):
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"""Works like :class:`.Serializer` but dumps and loads into a URL
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safe string consisting of the upper and lowercase character of the
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alphabet as well as ``'_'``, ``'-'`` and ``'.'``.
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"""
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class URLSafeTimedSerializer(URLSafeSerializerMixin, TimedSerializer):
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"""Works like :class:`.TimedSerializer` but dumps and loads into a
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URL safe string consisting of the upper and lowercase character of
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the alphabet as well as ``'_'``, ``'-'`` and ``'.'``.
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"""
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