o
    ¤ó·i  ã                   @   s¶   d Z 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mZ dd„ ZG d	d
„ d
eƒZG dd„ dƒZG dd„ deƒZG dd„ deƒZG dd„ deƒZG dd„ deƒZdS )z+
Provides various authentication policies.
é    N)ÚauthenticateÚget_user_model)ÚCsrfViewMiddleware)Úgettext_lazy)ÚHTTP_HEADER_ENCODINGÚ
exceptionsc                 C   s&   | j  dd¡}t|tƒr| t¡}|S )z‰
    Return request's 'Authorization:' header, as a bytestring.

    Hide some test client ickyness where the header can be unicode.
    ZHTTP_AUTHORIZATIONó    N)ÚMETAÚgetÚ
isinstanceÚstrÚencoder   )ÚrequestÚauth© r   úcC:\Users\psant\Downloads\PAF backend\school\venv\Lib\site-packages\rest_framework/authentication.pyÚget_authorization_header   s   

r   c                   @   s   e Zd Zdd„ ZdS )Ú	CSRFCheckc                 C   s   |S ©Nr   )Úselfr   Úreasonr   r   r   Ú_reject   s   zCSRFCheck._rejectN)Ú__name__Ú
__module__Ú__qualname__r   r   r   r   r   r      s    r   c                   @   ó    e Zd ZdZdd„ Zdd„ ZdS )ÚBaseAuthenticationzF
    All authentication classes should extend BaseAuthentication.
    c                 C   s   t dƒ‚)zS
        Authenticate the request and return a two-tuple of (user, token).
        z#.authenticate() must be overridden.N)ÚNotImplementedError©r   r   r   r   r   r   &   s   zBaseAuthentication.authenticatec                 C   s   dS )zç
        Return a string to be used as the value of the `WWW-Authenticate`
        header in a `401 Unauthenticated` response, or `None` if the
        authentication scheme should return `403 Permission Denied` responses.
        Nr   r   r   r   r   Úauthenticate_header,   s   z&BaseAuthentication.authenticate_headerN)r   r   r   Ú__doc__r   r   r   r   r   r   r   !   s    r   c                   @   s.   e Zd ZdZdZdd„ Zd
dd„Zdd	„ ZdS )ÚBasicAuthenticationz>
    HTTP Basic authentication against username/password.
    Úapic                 C   sî   t |ƒ ¡ }|r|d  ¡ dkrdS t|ƒdkr!tdƒ}t |¡‚t|ƒdkr0tdƒ}t |¡‚z*zt |d ¡ 	d¡}W n t
yP   t |d ¡ 	d	¡}Y nw | d
d¡\}}W n ttt
tjfyo   tdƒ}t |¡‚w |  |||¡S )zœ
        Returns a `User` if a correct username and password have been supplied
        using HTTP Basic authentication.  Otherwise returns `None`.
        r   s   basicNé   z.Invalid basic header. No credentials provided.é   zCInvalid basic header. Credentials string should not contain spaces.zutf-8zlatin-1ú:z?Invalid basic header. Credentials not correctly base64 encoded.)r   ÚsplitÚlowerÚlenÚ_r   ÚAuthenticationFailedÚbase64Ú	b64decodeÚdecodeÚUnicodeDecodeErrorÚ	TypeErrorÚ
ValueErrorÚbinasciiÚErrorÚauthenticate_credentials)r   r   r   ÚmsgZauth_decodedÚuseridÚpasswordr   r   r   r   ;   s*   

ÿ
þz BasicAuthentication.authenticateNc                 C   sT   t ƒ j|d|i}tdd|i|¤Ž}|du rt tdƒ¡‚|js&t tdƒ¡‚|dfS )z
        Authenticate the userid and password against username and password
        with optional request for context.
        r6   r   NzInvalid username/password.úUser inactive or deleted.r   )r   ZUSERNAME_FIELDr   r   r*   r)   Ú	is_active)r   r5   r6   r   ÚcredentialsÚuserr   r   r   r3   Y   s   þz,BasicAuthentication.authenticate_credentialsc                 C   s
   d| j  S )NzBasic realm="%s")Úwww_authenticate_realmr   r   r   r   r   l   s   
z'BasicAuthentication.authenticate_headerr   )r   r   r   r    r;   r   r3   r   r   r   r   r   r!   5   s    
r!   c                   @   r   )ÚSessionAuthenticationz<
    Use Django's session framework for authentication.
    c                 C   s.   t |jddƒ}|r|jsdS |  |¡ |dfS )z{
        Returns a `User` if the request session currently has a logged in user.
        Otherwise returns `None`.
        r:   N)ÚgetattrÚ_requestr8   Úenforce_csrf©r   r   r:   r   r   r   r   u   s
   

z"SessionAuthentication.authenticatec                 C   s@   dd„ }t |ƒ}| |¡ | |ddi ¡}|rt d| ¡‚dS )zK
        Enforce CSRF validation for session based authentication.
        c                 S   s   d S r   r   )r   r   r   r   Údummy_get_response‹   s   z>SessionAuthentication.enforce_csrf.<locals>.dummy_get_responseNr   zCSRF Failed: %s)r   Úprocess_requestZprocess_viewr   ZPermissionDenied)r   r   rA   Úcheckr   r   r   r   r?   ‡   s   
þz"SessionAuthentication.enforce_csrfN)r   r   r   r    r   r?   r   r   r   r   r<   p   s    r<   c                   @   s:   e Zd ZdZdZdZdd„ Z	 dd„ Zdd	„ Zd
d„ Z	dS )ÚTokenAuthenticationa  
    Simple token based authentication.

    Clients should authenticate by passing the token key in the "Authorization"
    HTTP header, prepended with the string "Token ".  For example:

        Authorization: Token 401f7ac837da42b97f613d789819ff93537bee6a
    ÚTokenNc                 C   s    | j d ur| j S ddlm} |S )Nr   )rE   )ÚmodelZrest_framework.authtoken.modelsrE   )r   rE   r   r   r   Ú	get_model¤   s   
zTokenAuthentication.get_modelc                 C   s¦   t |ƒ ¡ }|r|d  ¡ | j ¡  ¡ krd S t|ƒdkr&tdƒ}t |¡‚t|ƒdkr5tdƒ}t |¡‚z|d  	¡ }W n t
yM   tdƒ}t |¡‚w |  |¡S )Nr   r#   z.Invalid token header. No credentials provided.r$   z=Invalid token header. Token string should not contain spaces.zIInvalid token header. Token string should not contain invalid characters.)r   r&   r'   Úkeywordr   r(   r)   r   r*   r-   ÚUnicodeErrorr3   )r   r   r   r4   Útokenr   r   r   r   ±   s    


þ
z TokenAuthentication.authenticatec                 C   s`   |   ¡ }z|j d¡j|d�}W n |jy   t tdƒ¡‚w |jj	s+t tdƒ¡‚|j|fS )Nr:   )ÚkeyzInvalid token.r7   )
rG   ZobjectsZselect_relatedr
   ZDoesNotExistr   r*   r)   r:   r8   )r   rK   rF   rJ   r   r   r   r3   Æ   s   ÿ
z,TokenAuthentication.authenticate_credentialsc                 C   s   | j S r   )rH   r   r   r   r   r   Ò   s   z'TokenAuthentication.authenticate_header)
r   r   r   r    rH   rF   rG   r   r3   r   r   r   r   r   rD   —   s    	rD   c                   @   s   e Zd ZdZdZdd„ ZdS )ÚRemoteUserAuthenticationa  
    REMOTE_USER authentication.

    To use this, set up your web server to perform authentication, which will
    set the REMOTE_USER environment variable. You will need to have
    'django.contrib.auth.backends.RemoteUserBackend in your
    AUTHENTICATION_BACKENDS setting
    ZREMOTE_USERc                 C   s0   t ||j | j¡d�}|r|jr|d fS d S d S )N)r   Zremote_user)r   r	   r
   Úheaderr8   r@   r   r   r   r   å   s   
ÿz%RemoteUserAuthentication.authenticateN)r   r   r   r    rM   r   r   r   r   r   rL   Ö   s    rL   )r    r+   r1   Zdjango.contrib.authr   r   Zdjango.middleware.csrfr   Zdjango.utils.translationr   r)   Zrest_frameworkr   r   r   r   r   r!   r<   rD   rL   r   r   r   r   Ú<module>   s    ;'?