3
Yl                 @   s  d Z ddlZddlZddlZddlZddlZddlZddlZddl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 ddlmZ ddlmZmZmZmZmZmZmZmZmZmZmZmZm Z m!Z! dd	l"m#Z# dd
l$m%Z% ddl&m'Z'm(Z(m)Z)m*Z* dcZ+ej, Z-ej. dkr&dd Z/dd Zdd Z0dd Z1ddddZ2dd Z3dd Z4dd Z5d d! Z6d"d# Z7ded$d%Z8d&d' Z9d(d) Z:d*d+ Z;d,d- Z<d.d/ Z=d0d1 Z>d2d3 Z?e@dfZAd6d7 ZBd8d9 ZCd:d; ZDd<d= ZEd>d? ZFd@dA ZGejHdBdC ZIdDdE ZJdgdFdGZKdHdI ZLdhdKdLZMdMdN ZNdOdP ZOdQjPdRZQeQdS ZReQdT ZSdUdV ZTdWdX ZUdYdZ ZVejWd[ZXejWd\ZYd]d^ ZZd_d` Z[dadb Z\dS )iz
requests.utils
~~~~~~~~~~~~~~

This module provides utility functions that are used within Requests
that are also useful for external consumption.
    N   )__version__)certs)to_native_string)parse_http_list)quoteurlparsebytesstrOrderedDictunquote
getproxiesproxy_bypass
urlunparse
basestringinteger_typesis_py3proxy_bypass_environmentgetproxies_environment)cookiejar_from_dict)CaseInsensitiveDict)
InvalidURLInvalidHeaderFileModeWarningUnrewindableBodyError.netrc_netrcZWindowsc             C   s   t rdd l}ndd l}y2|j|jd}|j|dd }|j|dd }W n tk
r\   dS X | sj| rndS |jd}xX|D ]P}|dkrd| krd	S |jdd
}|jdd}|jdd}t	j
|| t	jr~d	S q~W dS )Nr   z;Software\Microsoft\Windows\CurrentVersion\Internet SettingsZProxyEnableZProxyOverrideF;z<local>.Tz\.*z.*?)r   winreg_winregOpenKeyHKEY_CURRENT_USERZQueryValueExOSErrorsplitreplacerematchI)hostr!   ZinternetSettingsZproxyEnableZproxyOverrideZtest r,   0/usr/lib/python3/dist-packages/requests/utils.pyproxy_bypass_registry-   s2    



r.   c             C   s   t  rt| S t| S dS )zReturn 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   N   s    r   c             C   s   t | dr| j } | S )z/Returns an internal sequence dictionary update.items)hasattrr/   )dr,   r,   r-   dict_to_sequenceZ   s    
r2   c             C   s2  d }d}t | drt| }nbt | dr.| j}nPt | dr~y| j }W n tjk
rZ   Y n$X tj|j}d| jkr~t	j
dt t | dry| j }W n$ ttfk
r   |d k	r|}Y n\X t | do|d kry&| jdd	 | j }| j|pd W n ttfk
r   d}Y nX |d kr$d}td|| S )
Nr   __len__lenfileno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.tellseek   )r0   r4   r5   ioUnsupportedOperationosfstatst_sizemodewarningswarnr   r7   r%   IOErrorr8   max)oZtotal_lengthZcurrent_positionr5   r,   r,   r-   	super_lenc   s@    







rE   Fc             C   s  yddl m }m} d}xJtD ]B}ytjjdj|}W n tk
rJ   dS X tjj|r|}P qW |dkrndS t	| }d}t
| tr|jd}|jj|d }	y6||j|	}
|
r|
d rdnd}|
| |
d fS W n |tfk
r   |r 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   )netrcNetrcParseErrorNz~/{0}   :asciir   r9   )rF   rG   NETRC_FILESr<   path
expanduserformatKeyErrorexistsr   
isinstancer
   decodenetlocr&   ZauthenticatorsrB   ImportErrorAttributeError)urlZraise_errorsrF   rG   Z
netrc_pathflocZriZsplitstrr+   r   Zlogin_ir,   r,   r-   get_netrc_auth   s8    


rX   c             C   sB   t | dd}|r>t|tr>|d dkr>|d dkr>tjj|S dS )z0Tries to guess the filename of the given object.nameNr   <r   >)getattrrP   r   r<   rK   basename)objrY   r,   r,   r-   guess_filename   s    r`   c             C   s.   | dkrdS t | ttttfr&tdt| S )a  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)rP   r
   r	   boolint
ValueErrorr   )valuer,   r,   r-   from_key_val_list   s
    re   c             C   sB   | dkrdS t | ttttfr&tdt | tjr:| j } t	| S )a  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)
rP   r
   r	   ra   rb   rc   collectionsMappingr/   list)rd   r,   r,   r-   to_key_val_list   s    ri   c             C   s\   g }xRt | D ]F}|dd |dd   ko4dkn  rJt|dd }|j| 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   "r\   r\   )_parse_list_headerunquote_header_valueappend)rd   resultitemr,   r,   r-   parse_list_header  s    (rp   c             C   s|   i }xrt | D ]f}d|kr$d||< q|jdd\}} | dd | dd   koVdkn  rlt| dd } | ||< 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
    =Nr   rj   r\   r\   )rk   r&   rl   )rd   rn   ro   rY   r,   r,   r-   parse_dict_header0  s    (rr   c             C   s^   | rZ| d | d	   kodkn  rZ| dd
 } | sF| dd dkrZ| j ddj ddS | S )zUnquotes 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   rj   Nr9   z\\\z\"r\   r\   )r'   )rd   Zis_filenamer,   r,   r-   rl   S  s
    $rl   c             C   s"   i }x| D ]}|j ||j< q
W |S )zReturns a key/value dictionary from a CookieJar.

    :param cj: CookieJar object to extract cookies from.
    :rtype: dict
    )rd   rY   )cjcookie_dictZcookier,   r,   r-   dict_from_cookiejarl  s    
rv   c             C   s
   t || S )zReturns 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   )rt   ru   r,   r,   r-   add_dict_to_cookiejar{  s    rw   c             C   sT   t jdt tjdtjd}tjdtjd}tjd}|j| |j|  |j|  S )zlReturns encodings from given content string.

    :param content: bytestring to extract encodings from.
    zIn 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=["\']*(.+?)["\'>])flagsz+<meta.*?content=["\']*;?charset=(.+?)["\'>]z$^<\?xml.*?encoding=["\']*(.+?)["\'>])r@   rA   DeprecationWarningr(   compiler*   findall)contentZ
charset_reZ	pragma_reZxml_rer,   r,   r-   get_encodings_from_content  s    
r}   c             C   sF   | j d}|sdS tj|\}}d|kr6|d jd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-typeNcharsetz'"textz
ISO-8859-1)getcgiZparse_headerstrip)headersZcontent_typeparamsr,   r,   r-   get_encoding_from_headers  s    
r   c             c   sr   |j dkr"x| D ]
}|V  qW dS tj|j dd}x | D ]}|j|}|r:|V  q:W |jddd}|rn|V  dS )zStream decodes a iterator.Nr'   )errors    T)final)encodingcodecsgetincrementaldecoderrQ   )iteratorrro   decoderchunkrvr,   r,   r-   stream_decode_response_unicode  s    





r   c             c   sL   d}|dks|dkrt | }x*|t | k rF| |||  V  ||7 }qW dS )z Iterate over slices of a string.r   N)r4   )stringZslice_lengthposr,   r,   r-   iter_slices  s    r   c             C   sv   t jdt g }t| j}|rJyt| j|S  tk
rH   |j| Y nX yt| j|ddS  t	k
rp   | jS X dS )zReturns 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
    zIn 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)
r@   rA   ry   r   r   r
   r|   UnicodeErrorrm   	TypeError)r   Ztried_encodingsr   r,   r,   r-   get_unicode_from_response  s    
r   Z4ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzz0123456789-._~c             C   s   | j d}xtdt|D ]}|| dd }t|dkr|j rytt|d}W n  tk
rt   td| Y nX |tkr||| dd  ||< qd||  ||< qd||  ||< qW dj	|S )	zUn-escape any percent-escape sequences in a URI that are unreserved
    characters. This leaves all reserved, illegal and non-ASCII bytes encoded.

    :rtype: str
    %r   r   r9      z%Invalid percent-escape sequence: '%s'N )
r&   ranger4   isalnumchrrb   rc   r   UNRESERVED_SETjoin)uripartsihcr,   r,   r-   unquote_unreserved  s    
r   c             C   s:   d}d}yt t| |dS  tk
r4   t | |dS X dS )zRe-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-   requote_uri  s    r   c             C   sl   t jdtj| d }|jd\}}t jdtjtt|d }t jdtj|d |@ }||@ ||@ kS )zThis 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   /)structZunpacksocket	inet_atonr&   dotted_netmaskrb   )ipZnetZipaddrZnetaddrbitsZnetmaskZnetworkr,   r,   r-   address_in_network"  s
    r   c             C   s&   ddd|  > d A }t jtjd|S )zConverts mask from /xx format to xxx.xxx.xxx.xxx

    Example: if mask is 24 function returns 255.255.255.0

    :rtype: str
    l    r       z>I)r   Z	inet_ntoar   Zpack)maskr   r,   r,   r-   r   1  s    r   c             C   s*   yt j|  W n t jk
r$   dS X dS )z
    :rtype: bool
    FT)r   r   error)Z	string_ipr,   r,   r-   is_ipv4_address<  s
    r   c             C   s   | j ddkryt| jdd }W n tk
r8   dS X |dk sJ|dkrNdS ytj| jdd  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)countrb   r&   rc   r   r   r   )Zstring_networkr   r,   r,   r-   is_valid_cidrG  s    r   c             c   sT   |dk	}|r"t jj| }|t j| < z
dV  W d|rN|dkrDt j| = n
|t j| < X dS )zSet 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<   environr   )Zenv_namerd   Zvalue_changedZ	old_valuer,   r,   r-   set_environ_  s    


r   c       	      C   s  dd }|}|dkr|d}t | j}|rdd |jddjd	D }|jd
d }t|rxb|D ](}t|r~t||rdS qb||krbdS qbW n0x.|D ]&}|j|s|jd
d j|rdS qW td|2 yt	|}W n t
tjfk
r   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| pt jj| j S )N)r<   r   r   upper)kr,   r,   r-   <lambda>{  s    z'should_bypass_proxies.<locals>.<lambda>Nno_proxyc             s   s   | ]}|r|V  qd S )Nr,   ).0r+   r,   r,   r-   	<genexpr>  s    z(should_bypass_proxies.<locals>.<genexpr> r   ,:r   TF)r   rR   r'   r&   r   r   r   endswithr   r   r   r   Zgaierror)	rU   r   Z	get_proxyZno_proxy_argrR   r   Zproxy_ipr+   Zbypassr,   r,   r-   should_bypass_proxiesu  s4    




r   c             C   s   t | |dri S t S dS )zA
    Return a dict of environment proxies.

    :rtype: dict
    )r   N)r   r   )rU   r   r,   r,   r-   get_environ_proxies  s    r   c             C   sv   |pi }t | }|jdkr.|j|j|jd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
    Nallz://zall://)r   Zhostnamer   scheme)rU   ZproxiesZurlpartsZ
proxy_keysproxyZ	proxy_keyr,   r,   r-   select_proxy  s    

r   python-requestsc             C   s   d| t f S )zO
    Return a string representing the default user agent.

    :rtype: str
    z%s/%s)r   )rY   r,   r,   r-   default_user_agent  s    r   c               C   s   t t djddddS )z9
    :rtype: requests.structures.CaseInsensitiveDict
    z, gzipdeflatez*/*z
keep-alive)z
User-AgentzAccept-EncodingZAcceptZ
Connection)r   r   )r   r   r   r,   r,   r,   r-   default_headers  s
    r   c       	      C   s   g }d}xt jd| D ]}y|jdd\}}W n tk
rL   |d }}Y nX d|jdi}xP|jdD ]B}y|jd\}} W n tk
r   P Y nX | j|||j|< qhW |j| qW |S )	zReturn 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   rU   z<> '"rq   )r(   r&   rc   r   rm   )	rd   ZlinksZreplace_charsvalrU   r   linkZparamkeyr,   r,   r-   parse_header_links  s     r    rI   r9      c             C   s   | 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}|dkrhd	S |dkr|ddd tkrd
S |ddd tkrdS |dkr|dd t	krdS |dd t	krdS dS )z
    :rtype: str
    N   zutf-32r   z	utf-8-sigr9   zutf-16r   zutf-8z	utf-16-ber   z	utf-16-lez	utf-32-bez	utf-32-le)
r   BOM_UTF32_LEBOM_UTF32_BEBOM_UTF8BOM_UTF16_LEBOM_UTF16_BEr   _null_null2_null3)dataZsampleZ	nullcountr,   r,   r-   guess_json_utf  s*    
r   c             C   s8   t | |\}}}}}}|s$|| }}t||||||fS )zGiven 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   )rU   Z
new_schemer   rR   rK   r   queryfragmentr,   r,   r-   prepend_scheme_if_needed0  s    
r   c             C   sB   t | }yt|jt|j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passwordrT   r   )rU   ZparsedZauthr,   r,   r-   get_auth_from_urlA  s    
r   s   ^\S[^\r\n]*$|^$z^\S[^\r\n]*$|^$c             C   sf   | \}}t |trt}nt}y|j|s4td| W n* tk
r`   td||t|f Y nX dS )zVerifies 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)rP   r	   _CLEAN_HEADER_REGEX_BYTE_CLEAN_HEADER_REGEX_STRr)   r   r   type)headerrY   rd   Zpatr,   r,   r-   check_header_validityV  s    

r   c             C   sF   t | \}}}}}}|s"|| }}|jddd }t|||||dfS )zW
    Given a url remove the fragment and the authentication part.

    :rtype: str
    @r   r   r\   )r   rsplitr   )rU   r   rR   rK   r   r   r   r,   r,   r-   urldefragauthk  s
    
r   c             C   s`   t | jdd}|dk	rTt| jtrTy|| j W q\ ttfk
rP   tdY q\X ntddS )zfMove file pointer back to its recorded starting position
    so it can be read again on redirect.
    r8   Nz;An error occurred when rewinding request body for redirect.z+Unable to rewind request body for redirect.)r]   ZbodyrP   Z_body_positionr   rB   r%   r   )Zprepared_requestZ	body_seekr,   r,   r-   rewind_body|  s    r   )r   r   )F)FzBABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~)N)r   )]__doc__r   r   rf   
contextlibr:   r<   platformr(   r   r   r@   r   r   r   Z_internal_utilsr   compatr   rk   r   r   r	   r
   r   r   r   r   r   r   r   r   r   r   Zcookiesr   Z
structuresr   
exceptionsr   r   r   r   rJ   whereZDEFAULT_CA_BUNDLE_PATHsystemr.   r2   rE   rX   r`   re   ri   rp   rr   rl   rv   rw   r}   r   r   r   r   	frozensetr   r   r   r   r   r   r   contextmanagerr   r   r   r   r   r   r   encoder   r   r   r   r   r   rz   r   r   r   r   r   r,   r,   r,   r-   <module>	   s   @!	=
3 #

%9

	"
 

