o
    ×ŸŽiM  ã                   @   sŠ  d Z ddlZddlZddlmZ ddlmZ ddlmZ ddl	m
Z
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 ddlmZ ddlmZ e  d¡Z!edƒZ"dZ#dZ$dZ%dZ&dZ'dZ(dZ)dZ*dZ+dZ,de, Z-ej.ej/ Z0dZ1dd„ Z2d d!„ Z3d"d#„ Z4d$d%„ Z5d&d'„ Z6d(d)„ Z7d*d+„ Z8G d,d-„ d-e9ƒZ:d.d/„ Z;d0d1„ Z<G d2d3„ d3e9ƒZ=G d4d5„ d5eƒZ>dS )6z’
Cross Site Request Forgery Middleware.

This module provides a middleware that implements protection
against request forgeries from other sites.
é    N)Údefaultdict©Úurlparse)Úsettings)ÚDisallowedHostÚImproperlyConfigured)ÚHttpHeadersÚUnreadablePostError)Úget_callable)Úpatch_vary_headers)Úconstant_time_compareÚget_random_string)ÚMiddlewareMixin)Úcached_property©Úis_same_domain)Úlog_response)Ú_lazy_re_compilezdjango.security.csrfz[^a-zA-Z0-9]z?Origin checking failed - %s does not match any trusted origins.z%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.z/Referer checking failed - Referer is malformed.zCReferer checking failed - Referer is insecure while host is secure.zhas incorrect lengthzhas invalid charactersé    é   Z
_csrftokenc                   C   s
   t tjƒS )z/Return the view to be used for CSRF rejections.N)r
   r   ZCSRF_FAILURE_VIEW© r   r   ú`C:\Users\psant\Downloads\Anu Raj Backend\school\venv\Lib\site-packages\django/middleware/csrf.pyÚ_get_failure_view1   s   
r   c                   C   s   t ttd�S )N)Úallowed_chars)r   ÚCSRF_SECRET_LENGTHÚCSRF_ALLOWED_CHARSr   r   r   r   Ú_get_new_csrf_string6   s   r   c                    sP   t ƒ }t‰ t‡ fdd„| D ƒ‡ fdd„|D ƒƒ}d ‡ fdd„|D ƒ¡}|| 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   ó   � | ]}ˆ   |¡V  qd S ©N©Úindex©Ú.0Úx©Úcharsr   r   Ú	<genexpr>A   ó   € z&_mask_cipher_secret.<locals>.<genexpr>Ú c                 3   s(   � | ]\}}ˆ || t ˆ ƒ  V  qd S r   )Úlen©r"   r#   Úyr$   r   r   r&   B   s   €& N)r   r   ÚzipÚjoin)ÚsecretÚmaskÚpairsÚcipherr   r$   r   Ú_mask_cipher_secret:   s
   &r2   c                    sZ   | dt … }| t d… } t‰ t‡ fdd„| D ƒ‡ fdd„|D ƒƒ}d ‡ fdd„|D ƒ¡S )zÑ
    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$   r   r   r&   O   r'   z'_unmask_cipher_token.<locals>.<genexpr>r(   c                 3   s    � | ]\}}ˆ ||  V  qd S r   r   r*   r$   r   r   r&   P   s   € )r   r   r,   r-   )Útokenr/   r0   r   r$   r   Ú_unmask_cipher_tokenF   s
   &r4   c                 C   s*   t ƒ }| j tjrt|ƒn|ddœ¡ |S )zDGenerate a new random CSRF_COOKIE value, and add it to request.META.T)ÚCSRF_COOKIEÚCSRF_COOKIE_NEEDS_UPDATEN)r   ÚMETAÚupdater   ZCSRF_COOKIE_MASKEDr2   ©ÚrequestÚcsrf_secretr   r   r   Ú_add_new_csrf_cookieS   s   
ÿøÿr<   c                 C   s6   d| j v r| j d }d| j d< t|ƒS t| ƒ}t|ƒS )aº  
    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.
    r5   Tr6   N)r7   r<   r2   r9   r   r   r   Ú	get_tokene   s   



ÿr=   c                 C   s   t | ƒ dS )zi
    Change the CSRF token in use for a request - should be done on login
    for security purposes.
    N)r<   )r:   r   r   r   Úrotate_tokenz   s   r>   c                   @   ó   e Zd Zdd„ ZdS )ÚInvalidTokenFormatc                 C   ó
   || _ d S r   ©Úreason©ÚselfrC   r   r   r   Ú__init__ƒ   ó   
zInvalidTokenFormat.__init__N©Ú__name__Ú
__module__Ú__qualname__rF   r   r   r   r   r@   ‚   ó    r@   c                 C   s.   t | ƒttfvrttƒ‚t | ¡rttƒ‚dS )zá
    Raise an InvalidTokenFormat error if the token has an invalid length or
    characters that aren't allowed. The token argument can be a CSRF cookie
    secret or non-cookie CSRF token, and either masked or unmasked.
    N)r)   ÚCSRF_TOKEN_LENGTHr   r@   ÚREASON_INCORRECT_LENGTHÚinvalid_token_chars_reÚsearchÚREASON_INVALID_CHARACTERS)r3   r   r   r   Ú_check_token_format‡   s
   
ÿrR   c                 C   s.   t | ƒtkr
t| ƒ} t | ƒtksJ ‚t| |ƒS )aƒ  
    Return whether the given CSRF token matches the given CSRF secret, after
    unmasking the token if necessary.

    This function assumes that the request_csrf_token argument has been
    validated to have the correct length (CSRF_SECRET_LENGTH or
    CSRF_TOKEN_LENGTH characters) and allowed characters, and that if it has
    length CSRF_TOKEN_LENGTH, it is a masked secret.
    N)r)   rM   r4   r   r   )Úrequest_csrf_tokenr;   r   r   r   Ú_does_token_match”   s   
rT   c                   @   r?   )ÚRejectRequestc                 C   rA   r   rB   rD   r   r   r   rF   ¦   rG   zRejectRequest.__init__NrH   r   r   r   r   rU   ¥   rL   rU   c                   @   sŒ   e Zd ZdZedd„ ƒZedd„ ƒZedd„ ƒ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S )ÚCsrfViewMiddlewarezê
    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   ó   dd„ t jD ƒS )Nc                 S   s   g | ]
}t |ƒj d ¡‘qS ©Ú*)r   ÚnetlocÚlstrip©r"   Úoriginr   r   r   Ú
<listcomp>µ   s    ÿÿzACsrfViewMiddleware.csrf_trusted_origins_hosts.<locals>.<listcomp>©r   ÚCSRF_TRUSTED_ORIGINS©rE   r   r   r   Úcsrf_trusted_origins_hosts³   s   þz-CsrfViewMiddleware.csrf_trusted_origins_hostsc                 C   rW   )Nc                 S   s   h | ]}d |vr|’qS rX   r   r\   r   r   r   Ú	<setcomp>¼   s    z;CsrfViewMiddleware.allowed_origins_exact.<locals>.<setcomp>r_   ra   r   r   r   Úallowed_origins_exactº   s   z(CsrfViewMiddleware.allowed_origins_exactc                 C   s:   t tƒ}dd„ tjD ƒD ]}||j  |j d¡¡ q|S )z‚
        A mapping of allowed schemes to list of allowed netlocs, where all
        subdomains of the netloc are allowed.
        c                 s   s    � | ]}d |v rt |ƒV  qdS )rY   Nr   r\   r   r   r   r&   Å   s   € ý
ÿz?CsrfViewMiddleware.allowed_origin_subdomains.<locals>.<genexpr>rY   N)r   Úlistr   r`   ÚschemeÚappendrZ   r[   )rE   Úallowed_origin_subdomainsÚparsedr   r   r   rh   ¾   s   
þz,CsrfViewMiddleware.allowed_origin_subdomainsc                 C   s
   d|_ d S )NT)Úcsrf_processing_done)rE   r:   r   r   r   Ú_acceptÏ   s   zCsrfViewMiddleware._acceptc                 C   s(   t ƒ ||d�}td||j||td� |S )NrB   zForbidden (%s): %s)Úresponser:   Úlogger)r   r   Úpathrm   )rE   r:   rC   rl   r   r   r   Ú_rejectÖ   s   úzCsrfViewMiddleware._rejectc                 C   s‚   t jrz|j t¡}W n# ty   tdƒ‚w z|jt j }W n t	y*   d}Y nw t
|ƒ |du r5dS t|ƒtkr?t|ƒ}|S )a  
        Return the CSRF secret originally associated with the request, or None
        if it didn't have one.

        If the CSRF_USE_SESSIONS setting is false, raises InvalidTokenFormat if
        the request's secret has invalid characters or an invalid length.
        z„CSRF_USE_SESSIONS is enabled, but request.session is not set. SessionMiddleware must appear before CsrfViewMiddleware in MIDDLEWARE.N)r   ÚCSRF_USE_SESSIONSÚsessionÚgetÚCSRF_SESSION_KEYÚAttributeErrorr   ZCOOKIESÚCSRF_COOKIE_NAMEÚKeyErrorrR   r)   rM   r4   ©rE   r:   r;   r   r   r   Ú_get_secretâ   s&   ÿÿÿzCsrfViewMiddleware._get_secretc              
   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ƒ d S )Nr5   )Zmax_ageÚdomainrn   ÚsecureÚhttponlyÚsamesite)ÚCookie)r   rp   rq   rr   rs   r7   Ú
set_cookieru   ZCSRF_COOKIE_AGEÚCSRF_COOKIE_DOMAINZCSRF_COOKIE_PATHZCSRF_COOKIE_SECUREZCSRF_COOKIE_HTTPONLYZCSRF_COOKIE_SAMESITEr   ©rE   r:   rl   r   r   r   Ú_set_csrf_cookie  s   ÿøz#CsrfViewMiddleware._set_csrf_cookiec                    sª   |j d }z| ¡ }W n	 ty   Y nw d| ¡ rdnd|f }||kr'dS || jv r.dS zt|ƒ}W n
 ty>   Y dS w |j}|j‰ t	‡ fdd„| j
 |d	¡D ƒƒS )
NÚHTTP_ORIGINz%s://%sÚhttpsÚhttpTFc                 3   s   � | ]}t ˆ |ƒV  qd S r   r   ©r"   Úhost©Zrequest_netlocr   r   r&   )  s
   € ÿ
ÿz6CsrfViewMiddleware._origin_verified.<locals>.<genexpr>r   )r7   Úget_hostr   Ú	is_securerd   r   Ú
ValueErrorrf   rZ   Úanyrh   rr   )rE   r:   Zrequest_originZ	good_hostZgood_originZparsed_originZrequest_schemer   r‡   r   Ú_origin_verified  s0   
ÿþ
ÿþz#CsrfViewMiddleware._origin_verifiedc                    s  |j  d¡‰ ˆ d u rttƒ‚ztˆ ƒ‰ W n ty   ttƒ‚w dˆ jˆ jfv r,ttƒ‚ˆ jdkr5tt	ƒ‚t
‡ fdd„| jD ƒƒrCd S tjrItjntj}|d u rfz| ¡ }W n tye   ttˆ  ¡  ƒ‚w | ¡ }|dvrtd||f }tˆ j|ƒs‚ttˆ  ¡  ƒ‚d S )NZHTTP_REFERERr(   rƒ   c                 3   s   � | ]	}t ˆ j|ƒV  qd S r   )r   rZ   r…   ©Zrefererr   r   r&   @  s
   € 
ÿ
ÿz4CsrfViewMiddleware._check_referer.<locals>.<genexpr>)Ú443Ú80z%s:%s)r7   rr   rU   ÚREASON_NO_REFERERr   rŠ   ÚREASON_MALFORMED_REFERERrf   rZ   ÚREASON_INSECURE_REFERERr‹   rb   r   rp   ZSESSION_COOKIE_DOMAINr   rˆ   r   ÚREASON_BAD_REFERERÚgeturlZget_portr   )rE   r:   Zgood_refererZserver_portr   r�   r   Ú_check_referer.  s@   ÿ
þÿýÿÿz!CsrfViewMiddleware._check_refererc                 C   s0   |dkrt  |¡}d|›d�}d|› d|› d�S )NÚPOSTzthe z HTTP headerzCSRF token from ú Ú.)r   Zparse_header_name)rE   rC   Útoken_sourceÚheader_namer   r   r   Ú_bad_token_message[  s   
z%CsrfViewMiddleware._bad_token_messagec              
   C   s  z|   |¡}W n ty } z	td|j› d�ƒ‚d }~ww |d u r%ttƒ‚d}|jdkr?z	|j dd¡}W n	 ty>   Y nw |dkr[z|j	t
j }W n tyV   ttƒ‚w t
j}nd}zt|ƒ W n tyz } z|  |j|¡}t|ƒ‚d }~ww t||ƒsŠ|  d|¡}t|ƒ‚d S )NzCSRF cookie r˜   r(   r–   ZcsrfmiddlewaretokenZ	incorrect)rx   r@   rU   rC   ÚREASON_NO_CSRF_COOKIEÚmethodr–   rr   r	   r7   r   ZCSRF_HEADER_NAMErv   ÚREASON_CSRF_TOKEN_MISSINGrR   r›   rT   )rE   r:   r;   ÚexcrS   r™   rC   r   r   r   Ú_check_tokenb  sD   €ÿ
ûÿ€þ
þzCsrfViewMiddleware._check_tokenc                 C   sF   z|   |¡}W n ty   t|ƒ Y d S w |d ur!||jd< d S d S )Nr5   )rx   r@   r<   r7   rw   r   r   r   Úprocess_request–  s   ÿûz"CsrfViewMiddleware.process_requestc              
   C   s  t |ddƒrd S t |ddƒrd S |jdv r|  |¡S t |ddƒr%|  |¡S d|jv r;|  |¡s:|  |t|jd  ¡S n%| ¡ r`z|  |¡ W n t	y_ } z|  ||j
¡W  Y d }~S d }~ww z|  |¡ W n t	y€ } z|  ||j
¡W  Y d }~S d }~ww |  |¡S )Nrj   FZcsrf_exempt)ÚGETÚHEADÚOPTIONSÚTRACEZ_dont_enforce_csrf_checksr‚   )Úgetattrr�   rk   r7   rŒ   ro   ÚREASON_BAD_ORIGINr‰   r•   rU   rC   r    )rE   r:   ÚcallbackÚcallback_argsÚcallback_kwargsrŸ   r   r   r   Úprocess_view£  s8   




ÿÿ€ÿ€ÿ
zCsrfViewMiddleware.process_viewc                 C   s&   |j  d¡r|  ||¡ d|j d< |S )Nr6   F)r7   rr   r�   r€   r   r   r   Úprocess_responseÜ  s   
z#CsrfViewMiddleware.process_responseN)rI   rJ   rK   Ú__doc__r   rb   rd   rh   rk   ro   rx   r�   rŒ   r•   r›   r    r¡   r«   r¬   r   r   r   r   rV   ª   s&    


 -49rV   )?r­   ÚloggingÚstringÚcollectionsr   Úurllib.parser   Zdjango.confr   Zdjango.core.exceptionsr   r   Zdjango.httpr   r	   Zdjango.urlsr
   Zdjango.utils.cacher   Zdjango.utils.cryptor   r   Zdjango.utils.deprecationr   Zdjango.utils.functionalr   Zdjango.utils.httpr   Zdjango.utils.logr   Zdjango.utils.regex_helperr   Ú	getLoggerrm   rO   r§   r�   r“   rœ   rž   r‘   r’   rN   rQ   r   rM   Úascii_lettersÚdigitsr   rs   r   r   r2   r4   r<   r=   r>   Ú	Exceptionr@   rR   rT   rU   rV   r   r   r   r   Ú<module>   sX    
ÿ