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requests.utils
~~~~~~~~~~~~~~

This module provides utility functions that are used within Requests
that are also useful for external consumption.
é    Né   )Ú__version__)Úcerts)Úto_native_string)Úparse_http_list)ÚquoteÚurlparseÚbytesÚstrÚOrderedDictÚunquoteÚ
getproxiesÚproxy_bypassÚ
urlunparseÚ
basestringÚinteger_typesÚis_py3Úproxy_bypass_environmentÚgetproxies_environment)Úcookiejar_from_dict)ÚCaseInsensitiveDict)Ú
InvalidURLÚInvalidHeaderÚFileModeWarningÚUnrewindableBodyErrorú.netrcÚ_netrcéP   i»  )ZhttpZhttpsZWindowsc             C   sÖ   t rdd l}ndd l}y2|j|jdƒ}|j|dƒd }|j|dƒd }W n tk
r\   dS X | sj| rndS |jdƒ}xX|D ]P}|dkr–d| kr–d	S |jdd
ƒ}|jddƒ}|jddƒ}t	j
|| t	jƒr~d	S q~W dS )Nr   z;Software\Microsoft\Windows\CurrentVersion\Internet SettingsZProxyEnableZProxyOverrideFú;z<local>Ú.Tz\.Ú*z.*ú?)r   ÚwinregÚ_winregÚOpenKeyÚHKEY_CURRENT_USERZQueryValueExÚOSErrorÚsplitÚreplaceÚreÚmatchÚI)Úhostr"   ZinternetSettingsZproxyEnableZproxyOverrideZtest© r-   ú/usr/lib/python3.6/utils.pyÚproxy_bypass_registry.   s2    



r/   c             C   s   t ƒ rt| ƒS t| ƒS dS )zšReturn True, if the host should be bypassed.

        Checks proxy settings gathered from the environment, if specified,
        or the registry.
        N)r   r   r/   )r,   r-   r-   r.   r   O   s    r   c             C   s   t | dƒr| jƒ } | S )z/Returns an internal sequence dictionary update.Úitems)Úhasattrr0   )Údr-   r-   r.   Údict_to_sequence[   s    
r3   c             C   s2  d }d}t | dƒrt| ƒ}nbt | dƒr.| j}nPt | dƒr~y| jƒ }W n tjk
rZ   Y n$X tj|ƒj}d| jkr~t	j
dtƒ t | dƒ�ry| jƒ }W n$ ttfk
rº   |d k	r¶|}Y n\X t | dƒoÌ|d k�ry&| jdd	ƒ | jƒ }| j|pðdƒ W n ttfk
�r   d}Y nX |d k�r$d}td|| ƒS )
Nr   Ú__len__ÚlenÚfilenoÚba%  Requests has determined the content-length for this request using the binary size of the file: however, the file has been opened in text mode (i.e. without the 'b' flag in the mode). This may lead to an incorrect content-length. In Requests 3.0, support will be removed for files in text mode.ÚtellÚseeké   )r1   r5   r6   ÚioÚUnsupportedOperationÚosÚfstatÚst_sizeÚmodeÚwarningsÚwarnr   r8   r&   ÚIOErrorr9   Úmax)ÚoZtotal_lengthZcurrent_positionr6   r-   r-   r.   Ú	super_lend   s@    







rF   Fc             C   s  yöddl m }m} d}xJtD ]B}ytjjdj|ƒƒ}W n tk
rJ   dS X tjj|ƒr|}P qW |dkrndS t	| ƒ}d}t
| tƒrŽ|jdƒ}|jj|ƒd }	y6||ƒj|	ƒ}
|
rÒ|
d r¾dnd}|
| |
d fS W n |tfk
rò   |rî‚ Y nX W n ttfk
�r   Y nX dS )	z;Returns the Requests tuple auth for a given url from netrc.r   )ÚnetrcÚNetrcParseErrorNz~/{0}ó   :Úasciir   r:   )rG   rH   ÚNETRC_FILESr=   ÚpathÚ
expanduserÚformatÚKeyErrorÚexistsr   Ú
isinstancer
   ÚdecodeÚnetlocr'   ZauthenticatorsrC   ÚImportErrorÚAttributeError)ÚurlZraise_errorsrG   rH   Z
netrc_pathÚfÚlocZriZsplitstrr,   r   Zlogin_ir-   r-   r.   Úget_netrc_auth¡   s8    


rY   c             C   sB   t | ddƒ}|r>t|tƒr>|d dkr>|d dkr>tjj|ƒS dS )z0Tries to guess the filename of the given object.ÚnameNr   ú<r   ú>éÿÿÿÿ)ÚgetattrrQ   r   r=   rL   Úbasename)ÚobjrZ   r-   r-   r.   Úguess_filenameÔ   s    ra   c             C   s.   | dkrdS t | ttttfƒr&tdƒ‚t| ƒS )aÅ  Take an object and test to see if it can be represented as a
    dictionary. Unless it can not be represented as such, return an
    OrderedDict, e.g.,

    ::

        >>> from_key_val_list([('key', 'val')])
        OrderedDict([('key', 'val')])
        >>> from_key_val_list('string')
        ValueError: need more than 1 value to unpack
        >>> from_key_val_list({'key': 'val'})
        OrderedDict([('key', 'val')])

    :rtype: OrderedDict
    Nz+cannot encode objects that are not 2-tuples)rQ   r
   r	   ÚboolÚintÚ
ValueErrorr   )Úvaluer-   r-   r.   Úfrom_key_val_listÜ   s
    rf   c             C   sB   | dkrdS t | ttttfƒr&tdƒ‚t | tjƒr:| jƒ } t	| ƒS )aŒ  Take an object and test to see if it can be represented as a
    dictionary. If it can be, return a list of tuples, e.g.,

    ::

        >>> to_key_val_list([('key', 'val')])
        [('key', 'val')]
        >>> to_key_val_list({'key': 'val'})
        [('key', 'val')]
        >>> to_key_val_list('string')
        ValueError: cannot encode objects that are not 2-tuples.

    :rtype: list
    Nz+cannot encode objects that are not 2-tuples)
rQ   r
   r	   rb   rc   rd   ÚcollectionsÚMappingr0   Úlist)re   r-   r-   r.   Úto_key_val_listõ   s    rj   c             C   s\   g }xRt | ƒD ]F}|dd… |dd…   ko4dkn  rJt|dd… ƒ}|j|ƒ qW |S )a  Parse lists as described by RFC 2068 Section 2.

    In particular, parse comma-separated lists where the elements of
    the list may include quoted-strings.  A quoted-string could
    contain a comma.  A non-quoted string could have quotes in the
    middle.  Quotes are removed automatically after parsing.

    It basically works like :func:`parse_set_header` just that items
    may appear multiple times and case sensitivity is preserved.

    The return value is a standard :class:`list`:

    >>> parse_list_header('token, "quoted value"')
    ['token', 'quoted value']

    To create a header from the :class:`list` again, use the
    :func:`dump_header` function.

    :param value: a string with a list header.
    :return: :class:`list`
    :rtype: list
    Nr   ú"r]   r]   )Ú_parse_list_headerÚunquote_header_valueÚappend)re   ÚresultÚitemr-   r-   r.   Úparse_list_header  s    (rq   c             C   s|   i }xrt | ƒD ]f}d|kr$d||< q|jddƒ\}} | dd… | dd…   koVdkn  rlt| dd… ƒ} | ||< qW |S )a^  Parse lists of key, value pairs as described by RFC 2068 Section 2 and
    convert them into a python dict:

    >>> d = parse_dict_header('foo="is a fish", bar="as well"')
    >>> type(d) is dict
    True
    >>> sorted(d.items())
    [('bar', 'as well'), ('foo', 'is a fish')]

    If there is no value for a key it will be `None`:

    >>> parse_dict_header('key_without_value')
    {'key_without_value': None}

    To create a header from the :class:`dict` again, use the
    :func:`dump_header` function.

    :param value: a string with a dict header.
    :return: :class:`dict`
    :rtype: dict
    ú=Nr   rk   r]   r]   )rl   r'   rm   )re   ro   rp   rZ   r-   r-   r.   Úparse_dict_header1  s    (rs   c             C   s^   | rZ| d | d	   kodkn  rZ| dd
… } | sF| dd… dkrZ| j ddƒj ddƒS | S )zçUnquotes a header value.  (Reversal of :func:`quote_header_value`).
    This does not use the real unquoting but what browsers are actually
    using for quoting.

    :param value: the header value to unquote.
    :rtype: str
    r   r   rk   Nr:   z\\ú\z\"r]   r]   )r(   )re   Zis_filenamer-   r-   r.   rm   T  s
    $rm   c             C   s"   i }x| D ]}|j ||j< q
W |S )z€Returns a key/value dictionary from a CookieJar.

    :param cj: CookieJar object to extract cookies from.
    :rtype: dict
    )re   rZ   )ÚcjÚcookie_dictZcookier-   r-   r.   Údict_from_cookiejarm  s    
rw   c             C   s
   t || ƒS )zÂReturns a CookieJar from a key/value dictionary.

    :param cj: CookieJar to insert cookies into.
    :param cookie_dict: Dict of key/values to insert into CookieJar.
    :rtype: CookieJar
    )r   )ru   rv   r-   r-   r.   Úadd_dict_to_cookiejar|  s    rx   c             C   sT   t jdtƒ tjdtjd�}tjdtjd�}tjdƒ}|j| ƒ|j| ƒ |j| ƒ S )zlReturns encodings from given content string.

    :param content: bytestring to extract encodings from.
    z¤In requests 3.0, get_encodings_from_content will be removed. For more information, please see the discussion on issue #2266. (This warning should only appear once.)z!<meta.*?charset=["\']*(.+?)["\'>])Úflagsz+<meta.*?content=["\']*;?charset=(.+?)["\'>]z$^<\?xml.*?encoding=["\']*(.+?)["\'>])rA   rB   ÚDeprecationWarningr)   Úcompiler+   Úfindall)ÚcontentZ
charset_reZ	pragma_reZxml_rer-   r-   r.   Úget_encodings_from_content‡  s    
r~   c             C   sF   | j dƒ}|sdS tj|ƒ\}}d|kr6|d jdƒS d|krBdS dS )z}Returns encodings from given HTTP Header Dict.

    :param headers: dictionary to extract encoding from.
    :rtype: str
    zcontent-typeNÚcharsetz'"Útextz
ISO-8859-1)ÚgetÚcgiZparse_headerÚstrip)ÚheadersZcontent_typeÚparamsr-   r-   r.   Úget_encoding_from_headers›  s    
r†   c             c   sr   |j dkr"x| D ]
}|V  qW dS tj|j ƒdd�}x | D ]}|j|ƒ}|r:|V  q:W |jddd�}|rn|V  dS )zStream decodes a iterator.Nr(   )Úerrorsó    T)Úfinal)ÚencodingÚcodecsÚgetincrementaldecoderrR   )ÚiteratorÚrrp   ÚdecoderÚchunkÚrvr-   r-   r.   Ústream_decode_response_unicode°  s    





r’   c             c   sL   d}|dks|dkrt | ƒ}x*|t | ƒk rF| ||| … V  ||7 }qW dS )z Iterate over slices of a string.r   N)r5   )ÚstringZslice_lengthÚposr-   r-   r.   Úiter_slicesÂ  s    r•   c             C   sv   t jdtƒ g }t| jƒ}|rJyt| j|ƒS  tk
rH   |j|ƒ Y nX yt| j|dd�S  t	k
rp   | jS X dS )zâReturns the requested content back in unicode.

    :param r: Response object to get unicode content from.

    Tried:

    1. charset from content-type
    2. fall back and replace all unicode characters

    :rtype: str
    z£In requests 3.0, get_unicode_from_response will be removed. For more information, please see the discussion on issue #2266. (This warning should only appear once.)r(   )r‡   N)
rA   rB   rz   r†   r„   r
   r}   ÚUnicodeErrorrn   Ú	TypeError)rŽ   Ztried_encodingsrŠ   r-   r-   r.   Úget_unicode_from_responseÌ  s    
r˜   Z4ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzz0123456789-._~c             C   sÈ   | j dƒ}x²tdt|ƒƒD ] }|| dd… }t|ƒdkrª|jƒ rªytt|dƒƒ}W n  tk
rt   td| ƒ‚Y nX |tkr˜||| dd…  ||< qºd||  ||< qd||  ||< qW dj	|ƒS )	z¨Un-escape any percent-escape sequences in a URI that are unreserved
    characters. This leaves all reserved, illegal and non-ASCII bytes encoded.

    :rtype: str
    ú%r   r   r:   é   z%Invalid percent-escape sequence: '%s'NÚ )
r'   Úranger5   ÚisalnumÚchrrc   rd   r   ÚUNRESERVED_SETÚjoin)ÚuriÚpartsÚiÚhÚcr-   r-   r.   Úunquote_unreservedõ  s    
r¦   c             C   s:   d}d}yt t| ƒ|d�S  tk
r4   t | |d�S X dS )z¬Re-quote the given URI.

    This function passes the given URI through an unquote/quote cycle to
    ensure that it is fully and consistently quoted.

    :rtype: str
    z!#$%&'()*+,/:;=?@[]~z!#$&'()*+,/:;=?@[]~)ZsafeN)r   r¦   r   )r¡   Zsafe_with_percentZsafe_without_percentr-   r-   r.   Úrequote_uri  s    r§   c             C   sl   t jdtj| ƒƒd }|jdƒ\}}t jdtjtt|ƒƒƒƒd }t jdtj|ƒƒd |@ }||@ ||@ kS )zïThis function allows you to check if an IP belongs to a network subnet

    Example: returns True if ip = 192.168.1.1 and net = 192.168.1.0/24
             returns False if ip = 192.168.1.1 and net = 192.168.100.0/24

    :rtype: bool
    z=Lr   ú/)ÚstructÚunpackÚsocketÚ	inet_atonr'   Údotted_netmaskrc   )ÚipZnetZipaddrZnetaddrÚbitsZnetmaskZnetworkr-   r-   r.   Úaddress_in_network#  s
    r°   c             C   s&   ddd|  > d A }t jtjd|ƒƒS )z�Converts mask from /xx format to xxx.xxx.xxx.xxx

    Example: if mask is 24 function returns 255.255.255.0

    :rtype: str
    l   ÿÿ r   é    z>I)r«   Z	inet_ntoar©   Úpack)Úmaskr¯   r-   r-   r.   r­   2  s    r­   c             C   s*   yt j| ƒ W n t jk
r$   dS X dS )z
    :rtype: bool
    FT)r«   r¬   Úerror)Z	string_ipr-   r-   r.   Úis_ipv4_address=  s
    rµ   c             C   sˆ   | j dƒdkr€yt| jdƒd ƒ}W n tk
r8   dS X |dk sJ|dkrNdS ytj| jdƒd ƒ W q„ tjk
r|   dS X ndS dS )zV
    Very simple check of the cidr format in no_proxy variable.

    :rtype: bool
    r¨   r   Fr±   r   T)Úcountrc   r'   rd   r«   r¬   r´   )Zstring_networkr³   r-   r-   r.   Úis_valid_cidrH  s    r·   c             c   sT   |dk	}|r"t jj| ƒ}|t j| < z
dV  W d|rN|dkrDt j| = n
|t j| < X dS )zÎSet the environment variable 'env_name' to 'value'

    Save previous value, yield, and then restore the previous value stored in
    the environment variable 'env_name'.

    If 'value' is None, do nothingN)r=   Úenvironr�   )Zenv_namere   Zvalue_changedZ	old_valuer-   r-   r.   Úset_environ`  s    


r¹   c       	      C   s  dd„ }|}|dkr|dƒ}t | ƒj}|rÀdd„ |jddƒjd	ƒD ƒ}|jd
ƒd }t|ƒr�xb|D ](}t|ƒr~t||ƒrŠdS qb||krbdS qbW n0x.|D ]&}|j|ƒs¸|jd
ƒd j|ƒr–dS q–W td|ƒ�2 yt	|ƒ}W n t
tjfk
rö   d}Y nX W dQ R X |�rdS dS )zL
    Returns whether we should bypass proxies or not.

    :rtype: bool
    c             S   s   t jj| ƒpt jj| jƒ ƒS )N)r=   r¸   r�   Úupper)Úkr-   r-   r.   Ú<lambda>|  s    z'should_bypass_proxies.<locals>.<lambda>NÚno_proxyc             s   s   | ]}|r|V  qd S )Nr-   )Ú.0r,   r-   r-   r.   ú	<genexpr>‰  s    z(should_bypass_proxies.<locals>.<genexpr>ú r›   ú,ú:r   TF)r   rS   r(   r'   rµ   r·   r°   Úendswithr¹   r   r—   r«   Zgaierror)	rV   r½   Z	get_proxyZno_proxy_argrS   r®   Zproxy_ipr,   Zbypassr-   r-   r.   Úshould_bypass_proxiesv  s4    




rÄ   c             C   s   t | |d�ri S tƒ S dS )zA
    Return a dict of environment proxies.

    :rtype: dict
    )r½   N)rÄ   r   )rV   r½   r-   r-   r.   Úget_environ_proxies¯  s    rÅ   c             C   sv   |pi }t | ƒ}|jdkr.|j|j|jdƒƒS |jd |j |jd|j dg}d}x|D ]}||krX|| }P qXW |S )z­Select a proxy for the url, if applicable.

    :param url: The url being for the request
    :param proxies: A dictionary of schemes or schemes and hosts to proxy URLs
    NÚallz://zall://)r   Zhostnamer�   Úscheme)rV   ZproxiesZurlpartsZ
proxy_keysÚproxyZ	proxy_keyr-   r-   r.   Úselect_proxy»  s    

rÉ   úpython-requestsc             C   s   d| t f S )zO
    Return a string representing the default user agent.

    :rtype: str
    z%s/%s)r   )rZ   r-   r-   r.   Údefault_user_agentÕ  s    rË   c               C   s   t tƒ djdƒdddœƒS )z9
    :rtype: requests.structures.CaseInsensitiveDict
    z, ÚgzipÚdeflatez*/*z
keep-alive)z
User-AgentzAccept-EncodingZAcceptZ
Connection)rÌ   rÍ   )r   rË   r    r-   r-   r-   r.   Údefault_headersÞ  s
    rÎ   c       	      C   sÀ   g }d}x²t jd| ƒD ]¢}y|jddƒ\}}W n tk
rL   |d }}Y nX d|jdƒi}xP|jdƒD ]B}y|jdƒ\}} W n tk
r”   P Y nX | j|ƒ||j|ƒ< qhW |j|ƒ qW |S )	z¼Return a dict of parsed link headers proxies.

    i.e. Link: <http:/.../front.jpeg>; rel=front; type="image/jpeg",<http://.../back.jpeg>; rel=back;type="image/jpeg"

    :rtype: list
    z '"z, *<r   r   r›   rV   z<> '"rr   )r)   r'   rd   rƒ   rn   )	re   ZlinksZreplace_charsÚvalrV   r…   ÚlinkZparamÚkeyr-   r-   r.   Úparse_header_linksê  s     rÒ   ú rJ   r:   é   c             C   sÐ   | dd… }|t jt jfkr dS |dd… t jkr6dS |dd… t jt jfkrRdS |jtƒ}|dkrhd	S |dkrœ|ddd… tkr†d
S |ddd… tkrœdS |dkrÌ|dd… t	kr¸dS |dd… t	krÌdS dS )z
    :rtype: str
    Né   zutf-32rÔ   z	utf-8-sigr:   zutf-16r   zutf-8z	utf-16-ber   z	utf-16-lez	utf-32-bez	utf-32-le)
r‹   ÚBOM_UTF32_LEÚBOM_UTF32_BEÚBOM_UTF8ÚBOM_UTF16_LEÚBOM_UTF16_BEr¶   Ú_nullÚ_null2Ú_null3)ÚdataZsampleZ	nullcountr-   r-   r.   Úguess_json_utf  s*    
rß   c             C   s8   t | |ƒ\}}}}}}|s$|| }}t||||||fƒS )zªGiven a URL that may or may not have a scheme, prepend the given scheme.
    Does not replace a present scheme with the one provided as an argument.

    :rtype: str
    )r   r   )rV   Z
new_schemerÇ   rS   rL   r…   ÚqueryÚfragmentr-   r-   r.   Úprepend_scheme_if_needed1  s    
râ   c             C   sB   t | ƒ}yt|jƒt|jƒf}W n ttfk
r<   d}Y nX |S )z{Given a url with authentication components, extract them into a tuple of
    username,password.

    :rtype: (str,str)
    r›   )r›   r›   )r   r   ZusernameZpasswordrU   r—   )rV   ZparsedZauthr-   r-   r.   Úget_auth_from_urlB  s    
rã   s   ^\S[^\r\n]*$|^$z^\S[^\r\n]*$|^$c             C   sf   | \}}t |tƒrt}nt}y|j|ƒs4td| ƒ‚W n* tk
r`   td||t|ƒf ƒ‚Y nX dS )zÕVerifies that header value is a string which doesn't contain
    leading whitespace or return characters. This prevents unintended
    header injection.

    :param header: tuple, in the format (name, value).
    z7Invalid return character or leading space in header: %sz>Value for header {%s: %s} must be of type str or bytes, not %sN)rQ   r	   Ú_CLEAN_HEADER_REGEX_BYTEÚ_CLEAN_HEADER_REGEX_STRr*   r   r—   Útype)ÚheaderrZ   re   Zpatr-   r-   r.   Úcheck_header_validityW  s    

rè   c             C   sF   t | ƒ\}}}}}}|s"|| }}|jddƒd }t|||||dfƒS )zW
    Given a url remove the fragment and the authentication part.

    :rtype: str
    ú@r   r›   r]   )r   Úrsplitr   )rV   rÇ   rS   rL   r…   rà   rá   r-   r-   r.   Úurldefragauthl  s
    
rë   c             C   s`   t | jddƒ}|dk	rTt| jtƒrTy|| jƒ W q\ ttfk
rP   tdƒ‚Y q\X ntdƒ‚dS )zfMove file pointer back to its recorded starting position
    so it can be read again on redirect.
    r9   Nz;An error occurred when rewinding request body for redirect.z+Unable to rewind request body for redirect.)r^   ZbodyrQ   Z_body_positionr   rC   r&   r   )Zprepared_requestZ	body_seekr-   r-   r.   Úrewind_body}  s    rì   )r   r   )F)FzBABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~)N)rÊ   )^Ú__doc__r‚   r‹   rg   Ú
contextlibr;   r=   Úplatformr)   r«   r©   rA   r   r›   r   Z_internal_utilsr   Úcompatr   rl   r   r   r	   r
   r   r   r   r   r   r   r   r   r   r   Zcookiesr   Z
structuresr   Ú
exceptionsr   r   r   r   rK   ÚwhereZDEFAULT_CA_BUNDLE_PATHZDEFAULT_PORTSÚsystemr/   r3   rF   rY   ra   rf   rj   rq   rs   rm   rw   rx   r~   r†   r’   r•   r˜   Ú	frozensetrŸ   r¦   r§   r°   r­   rµ   r·   Úcontextmanagerr¹   rÄ   rÅ   rÉ   rË   rÎ   rÒ   ÚencoderÛ   rÜ   rÝ   rß   râ   rã   r{   rä   rå   rè   rë   rì   r-   r-   r-   r.   Ú<module>	   s†   @
!	=
3 #

%9

	"
 

