U a+@sddlZddlZddlmZddlmZddlmZddlm Z ddlm Z ej e e fZejeZeje ejfZejeZeje Zejej eejeefefZejeejfZej ejeefZejedd d ZGd d d ZdS) N) want_bytes) BadPayload) BadSignature)_make_keys_list)Signer) serializerreturncCst|itS)z5Checks whether a serializer generates text or binary.) isinstancedumpsstr)rr XC:\Users\vtejo\AppData\Local\Temp\pip-unpacked-wheel-w3tduf5e\itsdangerous\serializer.pyis_text_serializersrc @sreZdZUdZeZejed<e Z e ed<gZ e ed<d,eeejeeje eeje ddd Zeed d d Zd-eejejejd ddZejedddZd.ee dddZd/eeje dddZd0ejeedddZd1ejejeddddZd2eeejejddd Zd3ejeejd!d"d#Z d4eee!d$d%d&Z"d5eeeee!d'd(d)Z#d6ejee!d!d*d+Z$dS)7 Serializera: A serializer wraps a :class:`~itsdangerous.signer.Signer` to enable serializing and securely signing data other than bytes. It can unsign to verify that the data hasn't been changed. The serializer provides :meth:`dumps` and :meth:`loads`, similar to :mod:`json`, and by default uses :mod:`json` internally to serialize the data to bytes. The secret key should be a random string of ``bytes`` and should not be saved to code or version control. Different salts should be used to distinguish signing in different contexts. See :doc:`/concepts` for information about the security of the secret key and salt. :param secret_key: The secret key to sign and verify with. Can be a list of keys, oldest to newest, to support key rotation. :param salt: Extra key to combine with ``secret_key`` to distinguish signatures in different contexts. :param serializer: An object that provides ``dumps`` and ``loads`` methods for serializing data to a string. Defaults to :attr:`default_serializer`, which defaults to :mod:`json`. :param serializer_kwargs: Keyword arguments to pass when calling ``serializer.dumps``. :param signer: A ``Signer`` class to instantiate when signing data. Defaults to :attr:`default_signer`, which defaults to :class:`~itsdangerous.signer.Signer`. :param signer_kwargs: Keyword arguments to pass when instantiating the ``Signer`` class. :param fallback_signers: List of signer parameters to try when unsigning with the default signer fails. Each item can be a dict of ``signer_kwargs``, a ``Signer`` class, or a tuple of ``(signer, signer_kwargs)``. Defaults to :attr:`default_fallback_signers`. .. versionchanged:: 2.0 Added support for key rotation by passing a list to ``secret_key``. .. versionchanged:: 2.0 Removed the default SHA-512 fallback signer from ``default_fallback_signers``. .. versionchanged:: 1.1 Added support for ``fallback_signers`` and configured a default SHA-512 fallback. This fallback is for users who used the yanked 1.0.0 release which defaulted to SHA-512. .. versionchanged:: 0.14 The ``signer`` and ``signer_kwargs`` parameters were added to the constructor. default_serializerdefault_signerdefault_fallback_signers itsdangerousN) secret_keysaltrserializer_kwargssigner signer_kwargsfallback_signerscCst||_|dk rt|}||_|dkr.|j}||_t||_|dkrL|j}||_|pXi|_ |dkrrt |j pnd}||_ |p~i|_ dS)Nr )r secret_keysrrrrrrrrlistrrr)selfrrrrrrrr r r__init__Ys    zSerializer.__init__)r cCs |jdS)zThe newest (last) entry in the :attr:`secret_keys` list. This is for compatibility from before key rotation support was added. )r)rr r rrszSerializer.secret_key)payloadrr c Cst|dkr|j}|j}nt|}z"|r6||dWS||WStk rn}ztd|dW5d}~XYnXdS)aLoads the encoded object. This function raises :class:`.BadPayload` if the payload is not valid. The ``serializer`` parameter can be used to override the serializer stored on the class. The encoded ``payload`` should always be bytes. Nutf-8zSCould not load the payload because an exception occurred on unserializing the data.)original_error)rrloadsdecode Exceptionr)rr rZis_texter r r load_payloads  zSerializer.load_payload)objr cCst|jj|f|jS)zDumps the encoded object. The return value is always bytes. If the internal serializer returns text, the value will be encoded as UTF-8. )rrr r)rr(r r r dump_payloadszSerializer.dump_payload)rr cCs(|dkr|j}|j|jfd|i|jS)zCreates a new instance of the signer to be used. The default implementation uses the :class:`.Signer` base class. Nr)rrrr)rrr r r make_signerszSerializer.make_signerccs||dkr|j}||V|jD]V}t|tr:|}|j}nt|trN|\}}n|j}|jD]}||fd|i|VqZq dS)zIterates over all signers to be tried for unsigning. Starts with the configured signer, then constructs each signer specified in ``fallback_signers``. Nr) rr*rr dictrtuplerr)rrfallbackkwargsrr r riter_unsignerss      zSerializer.iter_unsigners)r(rr cCs2t||}|||}|jr.|dS|S)zReturns a signed string serialized with the internal serializer. The return value can be either a byte or unicode string depending on the format of the internal serializer. r!)rr)r*signrr$)rr(rr rvr r rr s  zSerializer.dumps)r(frr cCs||||dS)zLike :meth:`dumps` but dumps into a file. The file handle has to be compatible with what the internal serializer expects. N)writer )rr(r2rr r rdumpszSerializer.dump)srr.r c Ksjt|}d}||D]B}z|||WStk rV}z|}W5d}~XYqXqtt|dS)ziReverse of :meth:`dumps`. Raises :exc:`.BadSignature` if the signature validation fails. N)rr/r'Zunsignr_tcast)rr5rr.Zlast_exceptionrerrr r rr#szSerializer.loads)r2rr cCs|||S)z)Like :meth:`loads` but loads from a file.)r#readrr2rr r rloadszSerializer.load)r5rr cCs |||S)a9Like :meth:`loads` but without verifying the signature. This is potentially very dangerous to use depending on how your serializer works. The return value is ``(signature_valid, payload)`` instead of just the payload. The first item will be a boolean that indicates if the signature is valid. This function never fails. Use it for debugging only and if you know that your serializer module is not exploitable (for example, do not use it with a pickle serializer). .. versionadded:: 0.15 )_loads_unsafe_impl)rr5rr r r loads_unsafeszSerializer.loads_unsafe)r5r load_kwargsload_payload_kwargsr c Cs|dkr i}zd|j|fd|i|fWStk r}z`|jdkrNWYPdS|dkrZi}zd|j|jf|fWWY"Stk rYWY dSXW5d}~XYnXdS)zfLow level helper function to implement :meth:`loads_unsafe` in serializer subclasses. NTr)FNF)r#rr r'r)rr5rr>r?r&r r rr<s   zSerializer._loads_unsafe_implcCs|j||dS)zYLike :meth:`loads_unsafe` but loads from a file. .. versionadded:: 0.15 )r)r=r9r:r r r load_unsafe"szSerializer.load_unsafe)rNNNNN)N)N)N)N)N)N)N)N)NN)N)%__name__ __module__ __qualname____doc__jsonrr6Any__annotations__rr _t_signerr _t_fallbacks _t_secret_key_t_opt_str_bytes _t_opt_kwargsOptionalrpropertybytesrr'r)r*Iteratorr/ _t_str_bytesr IOr4r#r;_t_load_unsafer=r<r@r r r rrsp 6   )       r) rEtypingr6encodingrexcrrrrrUnionr rOrQrMrKDictrFZ _t_kwargsrLTyperHListTuplerIboolrSIterablerJrrr r r rs