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oauthlib.common
~~~~~~~~~~~~~~
This module provides data structures and utilities common
to all implementations of OAuth.
� N)�quote�unquote� urlencode� )� get_debug)� SystemRandom�randbits)r � getrandbitsZ>abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789z_ !"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}z&([^&;]*(?:password|token)[^=]*=)[^&;]+z&%[^0-9A-Fa-f]|%[0-9A-Fa-f][^0-9A-Fa-f]zAABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.-Zoauthlib� /c C s: t | t�r| jd�n| } t| |�} t | t�r6| jd�} | S )Nzutf-8)�
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W |S )zfEnsures that all parameters in a list of 2-element tuples are decoded to
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zutf-8)r r r r )r �decodedr r r r r �decode_params_utf8T s r z=&;:%+~,*@!()/?'$c C sV | r.t | �tk r.d}t|t | �t | f ��tj| �r@td��tj| dd�}t|�S )a� Decode a query string in x-www-form-urlencoded format into a sequence
of two-element tuples.
Unlike urlparse.parse_qsl(..., strict_parsing=True) urldecode will enforce
correct formatting of the query string by validation. If validation fails
a ValueError will be raised. urllib.parse_qsl will only raise errors if
any of name-value pairs omits the equals sign.
z�Error trying to decode a non urlencoded string. Found invalid characters: %s in the string: '%s'. Please ensure the request/response body is x-www-form-urlencoded.z%Invalid hex encoding in query string.T)�keep_blank_values)�setr �
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|�}nd}|S )a* Extract parameters and return them as a list of 2-tuples.
Will successfully extract parameters from urlencoded query strings,
dicts, or lists of 2-tuples. Empty strings/dicts/lists will return an
empty list of parameters. Any other input will result in a return
value of None.
N�__iter__) r r r r) r" �hasattr�dict� TypeError�list�itemsr )�rawr r r r �extract_params� s
r1 c C s t t td��t� �S )a� Generate pseudorandom nonce that is unlikely to repeat.
Per `section 3.3`_ of the OAuth 1 RFC 5849 spec.
Per `section 3.2.1`_ of the MAC Access Authentication spec.
A random 64-bit number is appended to the epoch timestamp for both
randomness and to decrease the likelihood of collisions.
.. _`section 3.2.1`: https://tools.ietf.org/html/draft-ietf-oauth-v2-http-mac-01#section-3.2.1
.. _`section 3.3`: https://tools.ietf.org/html/rfc5849#section-3.3
�@ )r r �generate_timestampr r r r �generate_nonce� s r4 c C s t ttj� ��S )aD Get seconds since epoch (UTC).
Per `section 3.3`_ of the OAuth 1 RFC 5849 spec.
Per `section 3.2.1`_ of the MAC Access Authentication spec.
.. _`section 3.2.1`: https://tools.ietf.org/html/draft-ietf-oauth-v2-http-mac-01#section-3.2.1
.. _`section 3.3`: https://tools.ietf.org/html/rfc5849#section-3.3
)r �int�timer r r r r3 � s r3 � c s$ t � �dj� �fdd�t| �D ��S )aX Generates a non-guessable OAuth token
OAuth (1 and 2) does not specify the format of tokens except that they
should be strings of random characters. Tokens should not be guessable
and entropy when generating the random characters is important. Which is
why SystemRandom is used instead of the default random.choice method.
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r\ c C sL t | �t |�krdS d}x*t| |�D ] \}}|t|�t|�A O }q$W |dkS )a Near-constant time string comparison.
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as secret keys during request verification (`rootLabs`_).
.. _`rootLabs`: http://rdist.root.org/2010/01/07/timing-independent-array-comparison/
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