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Edit File : request.py \| Size : 3.62 KB
from __future__ import absolute_import from base64 import b64encode from ..packages.six import b, integer_types from ..exceptions import UnrewindableBodyError ACCEPT_ENCODING = 'gzip,deflate' _FAILEDTELL = object() def make_headers(keep_alive=None, accept_encoding=None, user_agent=None, basic_auth=None, proxy_basic_auth=None, disable_cache=None): """ Shortcuts for generating request headers. :param keep_alive: If ``True``, adds 'connection: keep-alive' header. :param accept_encoding: Can be a boolean, list, or string. ``True`` translates to 'gzip,deflate'. List will get joined by comma. String will be used as provided. :param user_agent: String representing the user-agent you want, such as "python-urllib3/0.6" :param basic_auth: Colon-separated username:password string for 'authorization: basic ...' auth header. :param proxy_basic_auth: Colon-separated username:password string for 'proxy-authorization: basic ...' auth header. :param disable_cache: If ``True``, adds 'cache-control: no-cache' header. Example:: >>> make_headers(keep_alive=True, user_agent="Batman/1.0") {'connection': 'keep-alive', 'user-agent': 'Batman/1.0'} >>> make_headers(accept_encoding=True) {'accept-encoding': 'gzip,deflate'} """ headers = {} if accept_encoding: if isinstance(accept_encoding, str): pass elif isinstance(accept_encoding, list): accept_encoding = ','.join(accept_encoding) else: accept_encoding = ACCEPT_ENCODING headers['accept-encoding'] = accept_encoding if user_agent: headers['user-agent'] = user_agent if keep_alive: headers['connection'] = 'keep-alive' if basic_auth: headers['authorization'] = 'Basic ' + \ b64encode(b(basic_auth)).decode('utf-8') if proxy_basic_auth: headers['proxy-authorization'] = 'Basic ' + \ b64encode(b(proxy_basic_auth)).decode('utf-8') if disable_cache: headers['cache-control'] = 'no-cache' return headers def set_file_position(body, pos): """ If a position is provided, move file to that point. Otherwise, we'll attempt to record a position for future use. """ if pos is not None: rewind_body(body, pos) elif getattr(body, 'tell', None) is not None: try: pos = body.tell() except (IOError, OSError): # This differentiates from None, allowing us to catch # a failed `tell()` later when trying to rewind the body. pos = _FAILEDTELL return pos def rewind_body(body, body_pos): """ Attempt to rewind body to a certain position. Primarily used for request redirects and retries. :param body: File-like object that supports seek. :param int pos: Position to seek to in file. """ body_seek = getattr(body, 'seek', None) if body_seek is not None and isinstance(body_pos, integer_types): try: body_seek(body_pos) except (IOError, OSError): raise UnrewindableBodyError("An error occurred when rewinding request " "body for redirect/retry.") elif body_pos is _FAILEDTELL: raise UnrewindableBodyError("Unable to record file position for rewinding " "request body during a redirect/retry.") else: raise ValueError("body_pos must be of type integer, " "instead it was %s." % type(body_pos)) Back

Edit File : request.py | Size : 3.62 KB

from __future__ import absolute_import
from base64 import b64encode

from ..packages.six import b, integer_types
from ..exceptions import UnrewindableBodyError

ACCEPT_ENCODING = 'gzip,deflate'
_FAILEDTELL = object()

def make_headers(keep_alive=None, accept_encoding=None, user_agent=None,
                 basic_auth=None, proxy_basic_auth=None, disable_cache=None):
    """
    Shortcuts for generating request headers.

:param keep_alive:
        If ``True``, adds 'connection: keep-alive' header.

:param accept_encoding:
        Can be a boolean, list, or string.
        ``True`` translates to 'gzip,deflate'.
        List will get joined by comma.
        String will be used as provided.

:param user_agent:
        String representing the user-agent you want, such as
        "python-urllib3/0.6"

:param basic_auth:
        Colon-separated username:password string for 'authorization: basic ...'
        auth header.

:param proxy_basic_auth:
        Colon-separated username:password string for 'proxy-authorization: basic ...'
        auth header.

:param disable_cache:
        If ``True``, adds 'cache-control: no-cache' header.

Example::

>>> make_headers(keep_alive=True, user_agent="Batman/1.0")
        {'connection': 'keep-alive', 'user-agent': 'Batman/1.0'}
        >>> make_headers(accept_encoding=True)
        {'accept-encoding': 'gzip,deflate'}
    """
    headers = {}
    if accept_encoding:
        if isinstance(accept_encoding, str):
            pass
        elif isinstance(accept_encoding, list):
            accept_encoding = ','.join(accept_encoding)
        else:
            accept_encoding = ACCEPT_ENCODING
        headers['accept-encoding'] = accept_encoding

if user_agent:
        headers['user-agent'] = user_agent

if keep_alive:
        headers['connection'] = 'keep-alive'

if basic_auth:
        headers['authorization'] = 'Basic ' + \
            b64encode(b(basic_auth)).decode('utf-8')

if proxy_basic_auth:
        headers['proxy-authorization'] = 'Basic ' + \
            b64encode(b(proxy_basic_auth)).decode('utf-8')

if disable_cache:
        headers['cache-control'] = 'no-cache'

return headers

def set_file_position(body, pos):
    """
    If a position is provided, move file to that point.
    Otherwise, we'll attempt to record a position for future use.
    """
    if pos is not None:
        rewind_body(body, pos)
    elif getattr(body, 'tell', None) is not None:
        try:
            pos = body.tell()
        except (IOError, OSError):
            # This differentiates from None, allowing us to catch
            # a failed `tell()` later when trying to rewind the body.
            pos = _FAILEDTELL

return pos

def rewind_body(body, body_pos):
    """
    Attempt to rewind body to a certain position.
    Primarily used for request redirects and retries.

:param body:
        File-like object that supports seek.

:param int pos:
        Position to seek to in file.
    """
    body_seek = getattr(body, 'seek', None)
    if body_seek is not None and isinstance(body_pos, integer_types):
        try:
            body_seek(body_pos)
        except (IOError, OSError):
            raise UnrewindableBodyError("An error occurred when rewinding request "
                                        "body for redirect/retry.")
    elif body_pos is _FAILEDTELL:
        raise UnrewindableBodyError("Unable to record file position for rewinding "
                                    "request body during a redirect/retry.")
    else:
        raise ValueError("body_pos must be of type integer, "
                         "instead it was %s." % type(body_pos))

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