U
    û‚ºeà-  ã                   @   sš   d dl Z d dlZd dlmZmZ d dlmZ d dlmZ d dlm	Z	 d dl
mZ d dlmZ ejej ZG dd	„ d	eƒZG d
d„ deƒZG dd„ dƒZdS )é    N)ÚdatetimeÚ	timedelta)Úsettings)Úsigning)Útimezone)Úget_random_string)Úimport_stringc                   @   s   e Zd ZdZdS )ÚCreateErrorz‡
    Used internally as a consistent exception type to catch from save (see the
    docstring for SessionBase.save() for details).
    N©Ú__name__Ú
__module__Ú__qualname__Ú__doc__© r   r   úI/tmp/pip-unpacked-wheel-lctamlir/django/contrib/sessions/backends/base.pyr	      s   r	   c                   @   s   e Zd ZdZdS )ÚUpdateErrorzF
    Occurs if Django tries to update a session that was deleted.
    Nr
   r   r   r   r   r      s   r   c                   @   sŽ  e Zd ZdZdZdZeƒ ZdVdd„Zdd„ Z	d	d
„ Z
dd„ Zdd„ Zedd„ ƒZdWdd„Zefdd„Zdd„ Zdd„ Zdd„ Zdd„ Zdd„ Zdd „ Zd!d"„ Zd#d$„ Zd%d&„ Zd'd(„ Zd)d*„ Zd+d,„ Zd-d.„ Zd/d0„ Zd1d2„ Zd3d4„ Z d5d6„ Z!d7d8„ Z"ee!ƒZ#ee!e"ƒZ$dXd:d;„Z%ee%ƒZ&d<d=„ Z'd>d?„ Z(d@dA„ Z)dBdC„ Z*dDdE„ Z+dFdG„ Z,dHdI„ Z-dJdK„ Z.dLdM„ Z/dYdNdO„Z0dZdPdQ„Z1dRdS„ Z2e3dTdU„ ƒZ4dS )[ÚSessionBasez-
    Base class for all Session classes.
    Z
testcookieZworkedNc                 C   s"   || _ d| _d| _ttjƒ| _d S )NF)Ú_session_keyÚaccessedÚmodifiedr   r   ZSESSION_SERIALIZERÚ
serializer©ÚselfÚsession_keyr   r   r   Ú__init__+   s    zSessionBase.__init__c                 C   s
   || j kS ©N©Ú_session©r   Úkeyr   r   r   Ú__contains__1   s    zSessionBase.__contains__c                 C   s
   | j | S r   r   r   r   r   r   Ú__getitem__4   s    zSessionBase.__getitem__c                 C   s   || j |< d| _d S ©NT©r   r   ©r   r   Úvaluer   r   r   Ú__setitem__7   s    
zSessionBase.__setitem__c                 C   s   | j |= d| _d S r"   r#   r   r   r   r   Ú__delitem__;   s    zSessionBase.__delitem__c                 C   s   d| j j S )Nzdjango.contrib.sessions.)Ú	__class__r   ©r   r   r   r   Úkey_salt?   s    zSessionBase.key_saltc                 C   s   | j  ||¡S r   )r   Úget)r   r   Údefaultr   r   r   r+   C   s    zSessionBase.getc                 C   s8   | j p|| jk| _ || jkr dn|f}| jj|f|žŽ S )Nr   )r   r   Ú_SessionBase__not_givenÚpop)r   r   r,   Úargsr   r   r   r.   F   s    zSessionBase.popc                 C   s,   || j kr| j | S d| _|| j |< |S d S r"   r#   r$   r   r   r   Ú
setdefaultK   s
    


zSessionBase.setdefaultc                 C   s   | j | | j< d S r   )ÚTEST_COOKIE_VALUEÚTEST_COOKIE_NAMEr)   r   r   r   Úset_test_cookieS   s    zSessionBase.set_test_cookiec                 C   s   |   | j¡| jkS r   )r+   r2   r1   r)   r   r   r   Útest_cookie_workedV   s    zSessionBase.test_cookie_workedc                 C   s   | | j = d S r   )r2   r)   r   r   r   Údelete_test_cookieY   s    zSessionBase.delete_test_cookiec                 C   s   t j|| j| jddS )zGReturn the given session dictionary serialized and encoded as a string.T)Úsaltr   Úcompress)r   Údumpsr*   r   )r   Zsession_dictr   r   r   Úencode\   s    üzSessionBase.encodec                 C   sX   zt j|| j| jdW S  t jk
r@   t d¡}| d¡ Y n tk
rR   Y nX i S )N)r6   r   z!django.security.SuspiciousSessionzSession data corrupted)	r   Úloadsr*   r   ZBadSignatureÚloggingÚ	getLoggerÚwarningÚ	Exception)r   Zsession_dataÚloggerr   r   r   Údecodee   s      ÿ
zSessionBase.decodec                 C   s   | j  |¡ d| _d S r"   )r   Úupdater   )r   Zdict_r   r   r   rA   s   s    zSessionBase.updatec                 C   s
   || j kS r   r   r   r   r   r   Úhas_keyw   s    zSessionBase.has_keyc                 C   s
   | j  ¡ S r   )r   Úkeysr)   r   r   r   rC   z   s    zSessionBase.keysc                 C   s
   | j  ¡ S r   )r   Úvaluesr)   r   r   r   rD   }   s    zSessionBase.valuesc                 C   s
   | j  ¡ S r   )r   Úitemsr)   r   r   r   rE   €   s    zSessionBase.itemsc                 C   s   i | _ d| _d| _d S r"   )Ú_session_cacher   r   r)   r   r   r   Úclearƒ   s    zSessionBase.clearc                 C   s.   z| j  o| j W S  tk
r(   Y dS X dS )zBReturn True when there is no session_key and the session is empty.TN)r   rF   ÚAttributeErrorr)   r   r   r   Úis_empty‹   s    zSessionBase.is_emptyc                 C   s   t dtƒ}|  |¡s |S q dS )z)Return session key that isn't being used.é    N)r   ÚVALID_KEY_CHARSÚexistsr   r   r   r   Ú_get_new_session_key’   s    

z SessionBase._get_new_session_keyc                 C   s   | j d kr|  ¡ | _ | j S r   )r   rM   r)   r   r   r   Ú_get_or_create_session_key™   s    

z&SessionBase._get_or_create_session_keyc                 C   s   |ot |ƒdkS )z”
        Key must be truthy and at least 8 characters long. 8 characters is an
        arbitrary lower bound for some minimal key security.
        é   )Úlenr   r   r   r   Ú_validate_session_keyž   s    z!SessionBase._validate_session_keyc                 C   s   | j S r   )Ú_SessionBase__session_keyr)   r   r   r   Ú_get_session_key¥   s    zSessionBase._get_session_keyc                 C   s   |   |¡r|| _nd| _dS )zV
        Validate session key on assignment. Invalid values will set to None.
        N)rQ   rR   ©r   r%   r   r   r   Ú_set_session_key¨   s    
zSessionBase._set_session_keyFc                 C   sJ   d| _ z| jW S  tk
rB   | jdks,|r4i | _n
|  ¡ | _Y nX | jS )zž
        Lazily load session from storage (unless "no_load" is True, when only
        an empty dict is stored) and store it in the current instance.
        TN)r   rF   rH   r   Úload)r   Zno_loadr   r   r   Ú_get_session´   s    zSessionBase._get_sessionc                 C   s   t jS r   )r   ZSESSION_COOKIE_AGEr)   r   r   r   Úget_session_cookie_ageÅ   s    z"SessionBase.get_session_cookie_agec                 K   s    z|d }W n t k
r(   t ¡ }Y nX z|d }W n t k
rT   |  d¡}Y nX |sb|  ¡ S t|ttfƒst|S t|tƒrˆt |¡}|| }|j	d |j
 S )zÕGet the number of seconds until the session expires.

        Optionally, this function accepts `modification` and `expiry` keyword
        arguments specifying the modification and expiry of the session.
        ÚmodificationÚexpiryÚ_session_expiryi€Q )ÚKeyErrorr   Únowr+   rX   Ú
isinstancer   ÚstrÚfromisoformatÚdaysÚseconds)r   ÚkwargsrY   rZ   Údeltar   r   r   Úget_expiry_ageÈ   s     

zSessionBase.get_expiry_agec                 K   s’   z|d }W n t k
r(   t ¡ }Y nX z|d }W n t k
rT   |  d¡}Y nX t|tƒrd|S t|tƒrxt |¡S |p‚|  ¡ }|t	|d S )zÔGet session the expiry date (as a datetime object).

        Optionally, this function accepts `modification` and `expiry` keyword
        arguments specifying the modification and expiry of the session.
        rY   rZ   r[   )rb   )
r\   r   r]   r+   r^   r   r_   r`   rX   r   )r   rc   rY   rZ   r   r   r   Úget_expiry_dateã   s    


zSessionBase.get_expiry_datec                 C   s`   |dkr,z
| d= W n t k
r&   Y nX dS t|tƒrBt ¡ | }t|tƒrT| ¡ }|| d< dS )a*  
        Set a custom expiration for the session. ``value`` can be an integer,
        a Python ``datetime`` or ``timedelta`` object or ``None``.

        If ``value`` is an integer, the session will expire after that many
        seconds of inactivity. If set to ``0`` then the session will expire on
        browser close.

        If ``value`` is a ``datetime`` or ``timedelta`` object, the session
        will expire at that specific future time.

        If ``value`` is ``None``, the session uses the global session expiry
        policy.
        Nr[   )r\   r^   r   r   r]   r   Ú	isoformatrT   r   r   r   Ú
set_expiryú   s    


zSessionBase.set_expiryc                 C   s    |   d¡ }dkrtjS |dkS )a  
        Return ``True`` if the session is set to expire when the browser
        closes, and ``False`` if there's an expiry date. Use
        ``get_expiry_date()`` or ``get_expiry_age()`` to find the actual expiry
        date/age, if there is one.
        r[   Nr   )r+   r   ZSESSION_EXPIRE_AT_BROWSER_CLOSE)r   rZ   r   r   r   Úget_expire_at_browser_close  s    z'SessionBase.get_expire_at_browser_closec                 C   s   |   ¡  |  ¡  d| _dS )zc
        Remove the current session data from the database and regenerate the
        key.
        N)rG   Údeleter   r)   r   r   r   Úflush!  s    zSessionBase.flushc                 C   s,   | j }| j}|  ¡  || _|r(|  |¡ dS )zU
        Create a new session key, while retaining the current session data.
        N)r   r   ÚcreaterF   rj   )r   Údatar   r   r   r   Ú	cycle_key*  s    zSessionBase.cycle_keyc                 C   s   t dƒ‚dS )zF
        Return True if the given session_key already exists.
        z9subclasses of SessionBase must provide an exists() methodN©ÚNotImplementedErrorr   r   r   r   rL   7  s    ÿzSessionBase.existsc                 C   s   t dƒ‚dS )zÅ
        Create a new session instance. Guaranteed to create a new object with
        a unique key and will have saved the result once (with empty data)
        before the method returns.
        z8subclasses of SessionBase must provide a create() methodNro   r)   r   r   r   rl   ?  s    ÿzSessionBase.createc                 C   s   t dƒ‚dS )zä
        Save the session data. If 'must_create' is True, create a new session
        object (or raise CreateError). Otherwise, only update an existing
        object and don't create one (raise UpdateError if needed).
        z6subclasses of SessionBase must provide a save() methodNro   )r   Zmust_creater   r   r   ÚsaveI  s    ÿzSessionBase.savec                 C   s   t dƒ‚dS )zx
        Delete the session data under this key. If the key is None, use the
        current session key value.
        z8subclasses of SessionBase must provide a delete() methodNro   r   r   r   r   rj   S  s    ÿzSessionBase.deletec                 C   s   t dƒ‚dS )z@
        Load the session data and return a dictionary.
        z6subclasses of SessionBase must provide a load() methodNro   r)   r   r   r   rV   \  s    ÿzSessionBase.loadc                 C   s   t dƒ‚dS )a  
        Remove expired sessions from the session store.

        If this operation isn't possible on a given backend, it should raise
        NotImplementedError. If it isn't necessary, because the backend has
        a built-in expiration mechanism, it should be a no-op.
        z.This backend does not support clear_expired().Nro   )Úclsr   r   r   Úclear_expiredd  s    	zSessionBase.clear_expired)N)N)F)F)N)5r   r   r   r   r2   r1   Úobjectr-   r   r    r!   r&   r'   Úpropertyr*   r+   r.   r0   r3   r4   r5   r9   r@   rA   rB   rC   rD   rE   rG   rI   rM   rN   rQ   rS   rU   r   r   rW   r   rX   re   rf   rh   ri   rk   rn   rL   rl   rq   rj   rV   Úclassmethodrs   r   r   r   r   r   !   sb   


		

	



	r   )r;   Ústringr   r   Zdjango.confr   Zdjango.corer   Zdjango.utilsr   Zdjango.utils.cryptor   Zdjango.utils.module_loadingr   Úascii_lowercaseÚdigitsrK   r>   r	   r   r   r   r   r   r   Ú<module>   s   	