U
    ;»{j  ã                   @  sÒ   d dl mZ d dlZd dlZd dlmZmZmZ d dlmZm	Z	m
Z
 d dlmZmZmZ erhd dlmZ dZddd	d
dœdd„Zd
ddœdd„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dS )é    )ÚannotationsN)ÚdatetimeÚ	timedeltaÚtimezone)Ú
formatdateÚ	parsedateÚparsedate_tz)ÚTYPE_CHECKINGÚAnyÚMapping)ÚHTTPResponsez%a, %d %b %Y %H:%M:%S GMTr   zdatetime | Noner   )ÚdeltaÚdateÚreturnc                 C  s   |pt  tj¡}||  S ©N)r   Únowr   Úutc)r   r   © r   úD/tmp/pip-install-zsn1f9xv/pip/pip/_vendor/cachecontrol/heuristics.pyÚexpire_after   s    r   Ústr)Údtr   c                 C  s   t t |  ¡ ¡ƒS r   )r   ÚcalendarÚtimegmÚ	timetuple)r   r   r   r   Údatetime_to_header   s    r   c                   @  s<   e Zd Zdddœdd„Zdddœdd„Zdddœd	d
„ZdS )ÚBaseHeuristicr   ú
str | None©Úresponser   c                 C  s   dS )a!  
        Return a valid 1xx warning header value describing the cache
        adjustments.

        The response is provided too allow warnings like 113
        http://tools.ietf.org/html/rfc7234#section-5.5.4 where we need
        to explicitly say response is over 24 hours old.
        z110 - "Response is Stale"r   ©Úselfr   r   r   r   Úwarning   s    	zBaseHeuristic.warningúdict[str, str]c                 C  s   i S )zïUpdate the response headers with any new headers.

        NOTE: This SHOULD always include some Warning header to
              signify that the response was cached by the client, not
              by way of the provided headers.
        r   r    r   r   r   Úupdate_headers'   s    zBaseHeuristic.update_headersc                 C  s@   |   |¡}|r<|j |¡ |  |¡}|d k	r<|j d|i¡ |S )NÚWarning)r$   ÚheadersÚupdater"   )r!   r   Zupdated_headersZwarning_header_valuer   r   r   Úapply0   s    

zBaseHeuristic.applyN)Ú__name__Ú
__module__Ú__qualname__r"   r$   r(   r   r   r   r   r      s   	r   c                   @  s    e Zd ZdZdddœdd„ZdS )ÚOneDayCachezM
    Cache the response by providing an expires 1 day in the
    future.
    r   r#   r   c                 C  sZ   i }d|j krVt|j d ƒ}ttdd�t|d d… dtjiŽd�}t|ƒ|d< d|d	< |S )
NÚexpiresr   é   )Údaysé   Útzinfo)r   Úpublicúcache-control)r&   r   r   r   r   r   r   r   )r!   r   r&   r   r-   r   r   r   r$   B   s    
þzOneDayCache.update_headersN)r)   r*   r+   Ú__doc__r$   r   r   r   r   r,   <   s   r,   c                   @  s@   e Zd ZdZdddœdd„Zddd	œd
d„Zddd	œdd„ZdS )ÚExpiresAfterz;
    Cache **all** requests for a defined time period.
    r
   ÚNone)Úkwr   c                 K  s   t f |Ž| _d S r   )r   r   )r!   r7   r   r   r   Ú__init__U   s    zExpiresAfter.__init__r   r#   r   c                 C  s   t | jƒ}t|ƒddœS )Nr2   )r-   r3   )r   r   r   )r!   r   r-   r   r   r   r$   X   s    
zExpiresAfter.update_headersr   c                 C  s   d}|| j  S )Nz:110 - Automatically cached for %s. Response might be stale)r   )r!   r   Útmplr   r   r   r"   \   s    zExpiresAfter.warningN)r)   r*   r+   r4   r8   r$   r"   r   r   r   r   r5   P   s   r5   c                   @  sJ   e Zd ZdZdddddddd	d
ddhZdddœdd„Zdddœdd„ZdS )ÚLastModifiedaÁ  
    If there is no Expires header already, fall back on Last-Modified
    using the heuristic from
    http://tools.ietf.org/html/rfc7234#section-4.2.2
    to calculate a reasonable value.

    Firefox also does something like this per
    https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching_FAQ
    http://lxr.mozilla.org/mozilla-release/source/netwerk/protocol/http/nsHttpResponseHead.cpp#397
    Unlike mozilla we limit this to 24-hr.
    éÈ   éË   éÌ   éÎ   i,  i-  i”  i•  iš  iž  iõ  r   r#   )Úrespr   c                 C  sò   |j }d|kri S d|kr*|d dkr*i S |j| jkr:i S d|ksJd|krNi S t|d ƒ}|d k	sft‚t |d d… ¡}t|d ƒ}|d kr�i S t ¡ }t	d|| ƒ}|t |¡ }t	dt
|d d	ƒƒ}	|	|krÔi S ||	 }
dt tt |
¡¡iS )
Nr-   r3   r2   r   zlast-modifiedr0   r   é
   i€Q )r&   ÚstatusÚcacheable_by_default_statusesr   ÚAssertionErrorr   r   r   ÚtimeÚmaxÚminÚstrftimeÚTIME_FMTÚgmtime)r!   r?   r&   Z
time_tupler   Zlast_modifiedr   Úcurrent_ager   Úfreshness_lifetimer-   r   r   r   r$   |   s.    zLastModified.update_headersr   c                 C  s   d S r   r   )r!   r?   r   r   r   r"   œ   s    zLastModified.warningN)r)   r*   r+   r4   rB   r$   r"   r   r   r   r   r:   a   s   õ r:   )N)Ú
__future__r   r   rD   r   r   r   Úemail.utilsr   r   r   Útypingr	   r
   r   Zpip._vendor.urllib3r   rH   r   r   r   r,   r5   r:   r   r   r   r   Ú<module>   s   !