o
    h5                     @   s*  d Z ddlZddlZddlZddlmZ ddlm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	lmZ dd
lmZ ddlmZ edZdZdZdZdZdZdZdZ de  Z!ej"ej# Z$dZ%dd Z&dd Z'dd Z(dd Z)dd Z*d d! Z+d"d# Z,d$d% Z-d&d' Z.G d(d) d)eZ/dS )*z
Cross Site Request Forgery Middleware.

This module provides a middleware that implements protection
against request forgeries from other sites.
    N)urlparse)settings)DisallowedHostImproperlyConfigured)get_callable)patch_vary_headers)constant_time_compareget_random_string)MiddlewareMixin)is_same_domain)log_responsezdjango.security.csrfz%Referer checking failed - no Referer.z@Referer checking failed - %s does not match any trusted origins.zCSRF cookie not set.z CSRF token missing or incorrect.z/Referer checking failed - Referer is malformed.zCReferer checking failed - Referer is insecure while host is secure.       Z
_csrftokenc                   C   s
   t tjS )z/Return the view to be used for CSRF rejections.)r   r   ZCSRF_FAILURE_VIEW r   r   ^/var/www/html/magazine_api/magazine_env/lib/python3.10/site-packages/django/middleware/csrf.py_get_failure_view$   s   
r   c                   C   s   t ttdS )N)allowed_chars)r	   CSRF_SECRET_LENGTHCSRF_ALLOWED_CHARSr   r   r   r   _get_new_csrf_string)   s   r   c                    sP   t  }t t fdd| D  fdd|D }d fdd|D }|| S )z
    Given a secret (assumed to be a string of CSRF_ALLOWED_CHARS), generate a
    token by adding a mask and applying it to the secret.
    c                 3       | ]}  |V  qd S Nindex.0xcharsr   r   	<genexpr>4       z&_mask_cipher_secret.<locals>.<genexpr> c                 3   s(    | ]\}} || t    V  qd S r   )lenr   r   yr   r   r   r   5   s   & )r   r   zipjoin)secretmaskpairscipherr   r   r   _mask_cipher_secret-   s
   &r+   c                    sZ   | dt  }| t d } t t fdd| D  fdd|D }d fdd|D S )z
    Given a token (assumed to be a string of CSRF_ALLOWED_CHARS, of length
    CSRF_TOKEN_LENGTH, and that its first half is a mask), use it to decrypt
    the second half to produce the original secret.
    Nc                 3   r   r   r   r   r   r   r   r   B   r    z'_unmask_cipher_token.<locals>.<genexpr>r!   c                 3   s     | ]\}} ||  V  qd S r   r   r#   r   r   r   r   C   s    )r   r   r%   r&   )tokenr(   r)   r   r   r   _unmask_cipher_token9   s
   &r-   c                   C   s
   t t S r   )r+   r   r   r   r   r   _get_new_csrf_tokenF   s   
r.   c                 C   s@   d| j vrt }t|| j d< nt| j d }d| j d< t|S )a  
    Return the CSRF token required for a POST form. The token is an
    alphanumeric value. A new token is created if one is not already set.

    A side effect of calling this function is to make the csrf_protect
    decorator and the CsrfViewMiddleware add a CSRF cookie and a 'Vary: Cookie'
    header to the outgoing response.  For this reason, you may need to use this
    function lazily, as is done by the csrf context processor.
    CSRF_COOKIETCSRF_COOKIE_USED)METAr   r+   r-   )requestZcsrf_secretr   r   r   	get_tokenJ   s   


r3   c                 C   s   | j dt d d| _dS )zi
    Change the CSRF token in use for a request - should be done on login
    for security purposes.
    T)r0   r/   N)r1   updater.   csrf_cookie_needs_reset)r2   r   r   r   rotate_token]   s
   
r6   c                 C   s<   t d| r	t S t| tkr| S t| tkrt| S t S )Nz[^a-zA-Z0-9])researchr.   r"   CSRF_TOKEN_LENGTHr   r+   )r,   r   r   r   _sanitize_tokeni   s   r:   c                 C   s   t t| t|S r   )r   r-   )request_csrf_token
csrf_tokenr   r   r   _compare_masked_tokensz   s   r=   c                   @   sH   e Zd ZdZdd Zdd Zdd Zdd	 Zd
d Zdd Z	dd Z
dS )CsrfViewMiddlewarez
    Require a present and correct csrfmiddlewaretoken for POST requests that
    have a CSRF cookie, and set an outgoing CSRF cookie.

    This middleware should be used in conjunction with the {% csrf_token %}
    template tag.
    c                 C   s
   d|_ d S )NT)csrf_processing_done)selfr2   r   r   r   _accept   s   zCsrfViewMiddleware._acceptc                 C   s(   t  ||d}td||j||td |S )N)reasonzForbidden (%s): %s)responser2   logger)r   r   pathrD   )r@   r2   rB   rC   r   r   r   _reject   s   zCsrfViewMiddleware._rejectc                 C   sl   t jrz|jtW S  ty   tdw z|jt j }W n
 t	y(   Y d S w t
|}||kr4d|_|S )NzCSRF_USE_SESSIONS is enabled, but request.session is not set. SessionMiddleware must appear before CsrfViewMiddleware in MIDDLEWARE.T)r   CSRF_USE_SESSIONSsessiongetCSRF_SESSION_KEYAttributeErrorr   ZCOOKIESCSRF_COOKIE_NAMEKeyErrorr:   r5   )r@   r2   Zcookie_tokenr<   r   r   r   
_get_token   s"   zCsrfViewMiddleware._get_tokenc              
   C   sp   t jr|jt|jd kr|jd |jt< d S d S |jt j|jd t jt j	t j
t jt jt jd t|d d S )Nr/   )max_agedomainrE   securehttponlysamesite)Cookie)r   rG   rH   rI   rJ   r1   
set_cookierL   ZCSRF_COOKIE_AGECSRF_COOKIE_DOMAINZCSRF_COOKIE_PATHZCSRF_COOKIE_SECUREZCSRF_COOKIE_HTTPONLYZCSRF_COOKIE_SAMESITEr   r@   r2   rC   r   r   r   
_set_token   s   zCsrfViewMiddleware._set_tokenc                 C   s$   |  |}|d ur||jd< d S d S )Nr/   )rN   r1   )r@   r2   r<   r   r   r   process_request   s   
z"CsrfViewMiddleware.process_requestc                    s  t |ddrd S t |ddrd S |jdvrt |ddr | |S | r|jd  d u r4| |tS t  d j	 j
fv rF| |tS  j	dkrQ| |tS tjrWtjntj}|d urm| }|d	vrld
||f }nz| }W n	 ty|   Y nw ttj}|d ur|| t fdd|D st   }| ||S | |}	|	d u r| |tS d}
|jdkrz	|jdd}
W n	 ty   Y nw |
dkr|jtjd}
t|
}
t |
|	s| |t!S | |S )Nr?   FZcsrf_exempt)GETHEADOPTIONSTRACEZ_dont_enforce_csrf_checksZHTTP_REFERERr!   https)44380z%s:%sc                 3   s    | ]	}t  j|V  qd S r   )r   netloc)r   hostZrefererr   r   r     s    z2CsrfViewMiddleware.process_view.<locals>.<genexpr>POSTZcsrfmiddlewaretoken)"getattrmethodrA   Z	is_securer1   rI   rF   REASON_NO_REFERERr   schemera   REASON_MALFORMED_REFERERREASON_INSECURE_REFERERr   rG   ZSESSION_COOKIE_DOMAINrV   Zget_portget_hostr   listZCSRF_TRUSTED_ORIGINSappendanyREASON_BAD_REFERERgeturlrN   REASON_NO_CSRF_COOKIErd   OSErrorZCSRF_HEADER_NAMEr:   r=   REASON_BAD_TOKEN)r@   r2   callbackcallback_argscallback_kwargsZgood_refererZserver_portZ
good_hostsrB   r<   r;   r   rc   r   process_view   sh   








zCsrfViewMiddleware.process_viewc                 C   sD   t |ddst |ddr|S |jdds|S | || d|_|S )Nr5   Fcsrf_cookie_setr0   T)re   r1   rI   rX   rx   rW   r   r   r   process_response=  s   z#CsrfViewMiddleware.process_responseN)__name__
__module____qualname____doc__rA   rF   rN   rX   rY   rw   ry   r   r   r   r   r>      s    	
pr>   )0r}   loggingr7   stringurllib.parser   Zdjango.confr   Zdjango.core.exceptionsr   r   Zdjango.urlsr   Zdjango.utils.cacher   Zdjango.utils.cryptor   r	   Zdjango.utils.deprecationr
   Zdjango.utils.httpr   Zdjango.utils.logr   	getLoggerrD   rg   ro   rq   rs   ri   rj   r   r9   ascii_lettersdigitsr   rJ   r   r   r+   r-   r.   r3   r6   r:   r=   r>   r   r   r   r   <module>   sD    
	