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Edit File: utils.py

# -*- coding: utf-8 -*-

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

This module provides utility functions that are used within Requests
that are also useful for external consumption.
"""

import codecs
import contextlib
import io
import os
import re
import socket
import struct
import sys
import tempfile
import warnings
import zipfile
from collections import OrderedDict

from .__version__ import __version__
from . import certs
# to_native_string is unused here, but imported here for backwards compatibility
from ._internal_utils import to_native_string
from .compat import parse_http_list as _parse_list_header
from .compat import (
    quote, urlparse, bytes, str, unquote, getproxies,
    proxy_bypass, urlunparse, basestring, integer_types, is_py3,
    proxy_bypass_environment, getproxies_environment, Mapping)
from .cookies import cookiejar_from_dict
from .structures import CaseInsensitiveDict
from .exceptions import (
    InvalidURL, InvalidHeader, FileModeWarning, UnrewindableBodyError)

NETRC_FILES = ('.netrc', '_netrc')

DEFAULT_CA_BUNDLE_PATH = certs.where()

DEFAULT_PORTS = {'http': 80, 'https': 443}

if sys.platform == 'win32':
    # provide a proxy_bypass version on Windows without DNS lookups

def proxy_bypass_registry(host):
        try:
            if is_py3:
                import winreg
            else:
                import _winreg as winreg
        except ImportError:
            return False

try:
            internetSettings = winreg.OpenKey(winreg.HKEY_CURRENT_USER,
                r'Software\Microsoft\Windows\CurrentVersion\Internet Settings')
            # ProxyEnable could be REG_SZ or REG_DWORD, normalizing it
            proxyEnable = int(winreg.QueryValueEx(internetSettings,
                                              'ProxyEnable')[0])
            # ProxyOverride is almost always a string
            proxyOverride = winreg.QueryValueEx(internetSettings,
                                                'ProxyOverride')[0]
        except OSError:
            return False
        if not proxyEnable or not proxyOverride:
            return False

# make a check value list from the registry entry: replace the
        # '<local>' string by the localhost entry and the corresponding
        # canonical entry.
        proxyOverride = proxyOverride.split(';')
        # now check if we match one of the registry values.
        for test in proxyOverride:
            if test == '<local>':
                if '.' not in host:
                    return True
            test = test.replace(".", r"\.")     # mask dots
            test = test.replace("*", r".*")     # change glob sequence
            test = test.replace("?", r".")      # change glob char
            if re.match(test, host, re.I):
                return True
        return False

def proxy_bypass(host):  # noqa
        """Return True, if the host should be bypassed.

Checks proxy settings gathered from the environment, if specified,
        or the registry.
        """
        if getproxies_environment():
            return proxy_bypass_environment(host)
        else:
            return proxy_bypass_registry(host)

def dict_to_sequence(d):
    """Returns an internal sequence dictionary update."""

if hasattr(d, 'items'):
        d = d.items()

return d

def super_len(o):
    total_length = None
    current_position = 0

if hasattr(o, '__len__'):
        total_length = len(o)

elif hasattr(o, 'len'):
        total_length = o.len

elif hasattr(o, 'fileno'):
        try:
            fileno = o.fileno()
        except io.UnsupportedOperation:
            pass
        else:
            total_length = os.fstat(fileno).st_size

# Having used fstat to determine the file length, we need to
            # confirm that this file was opened up in binary mode.
            if 'b' not in o.mode:
                warnings.warn((
                    "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."),
                    FileModeWarning
                )

if hasattr(o, 'tell'):
        try:
            current_position = o.tell()
        except (OSError, IOError):
            # This can happen in some weird situations, such as when the file
            # is actually a special file descriptor like stdin. In this
            # instance, we don't know what the length is, so set it to zero and
            # let requests chunk it instead.
            if total_length is not None:
                current_position = total_length
        else:
            if hasattr(o, 'seek') and total_length is None:
                # StringIO and BytesIO have seek but no useable fileno
                try:
                    # seek to end of file
                    o.seek(0, 2)
                    total_length = o.tell()

# seek back to current position to support
                    # partially read file-like objects
                    o.seek(current_position or 0)
                except (OSError, IOError):
                    total_length = 0

if total_length is None:
        total_length = 0

return max(0, total_length - current_position)

def get_netrc_auth(url, raise_errors=False):
    """Returns the Requests tuple auth for a given url from netrc."""

netrc_file = os.environ.get('NETRC')
    if netrc_file is not None:
        netrc_locations = (netrc_file,)
    else:
        netrc_locations = ('~/{}'.format(f) for f in NETRC_FILES)

try:
        from netrc import netrc, NetrcParseError

netrc_path = None

for f in netrc_locations:
            try:
                loc = os.path.expanduser(f)
            except KeyError:
                # os.path.expanduser can fail when $HOME is undefined and
                # getpwuid fails. See https://bugs.python.org/issue20164 &
                # https://github.com/psf/requests/issues/1846
                return

if os.path.exists(loc):
                netrc_path = loc
                break

# Abort early if there isn't one.
        if netrc_path is None:
            return

ri = urlparse(url)
        host = ri.hostname

try:
            _netrc = netrc(netrc_path).authenticators(host)
            if _netrc:
                # Return with login / password
                login_i = (0 if _netrc[0] else 1)
                return (_netrc[login_i], _netrc[2])
        except (NetrcParseError, IOError):
            # If there was a parsing error or a permissions issue reading the file,
            # we'll just skip netrc auth unless explicitly asked to raise errors.
            if raise_errors:
                raise

# App Engine hackiness.
    except (ImportError, AttributeError):
        pass

def guess_filename(obj):
    """Tries to guess the filename of the given object."""
    name = getattr(obj, 'name', None)
    if (name and isinstance(name, basestring) and name[0] != '<' and
            name[-1] != '>'):
        return os.path.basename(name)

def extract_zipped_paths(path):
    """Replace nonexistent paths that look like they refer to a member of a zip
    archive with the location of an extracted copy of the target, or else
    just return the provided path unchanged.
    """
    if os.path.exists(path):
        # this is already a valid path, no need to do anything further
        return path

# find the first valid part of the provided path and treat that as a zip archive
    # assume the rest of the path is the name of a member in the archive
    archive, member = os.path.split(path)
    while archive and not os.path.exists(archive):
        archive, prefix = os.path.split(archive)
        member = '/'.join([prefix, member])

if not zipfile.is_zipfile(archive):
        return path

zip_file = zipfile.ZipFile(archive)
    if member not in zip_file.namelist():
        return path

# we have a valid zip archive and a valid member of that archive
    tmp = tempfile.gettempdir()
    extracted_path = os.path.join(tmp, *member.split('/'))
    if not os.path.exists(extracted_path):
        extracted_path = zip_file.extract(member, path=tmp)

return extracted_path

def from_key_val_list(value):
    """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')
        Traceback (most recent call last):
        ...
        ValueError: cannot encode objects that are not 2-tuples
        >>> from_key_val_list({'key': 'val'})
        OrderedDict([('key', 'val')])

:rtype: OrderedDict
    """
    if value is None:
        return None

if isinstance(value, (str, bytes, bool, int)):
        raise ValueError('cannot encode objects that are not 2-tuples')

return OrderedDict(value)

def to_key_val_list(value):
    """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')
        Traceback (most recent call last):
        ...
        ValueError: cannot encode objects that are not 2-tuples

:rtype: list
    """
    if value is None:
        return None

if isinstance(value, (str, bytes, bool, int)):
        raise ValueError('cannot encode objects that are not 2-tuples')

if isinstance(value, Mapping):
        value = value.items()

return list(value)

# From mitsuhiko/werkzeug (used with permission).
def parse_list_header(value):
    """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
    """
    result = []
    for item in _parse_list_header(value):
        if item[:1] == item[-1:] == '"':
            item = unquote_header_value(item[1:-1])
        result.append(item)
    return result

# From mitsuhiko/werkzeug (used with permission).
def parse_dict_header(value):
    """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
    """
    result = {}
    for item in _parse_list_header(value):
        if '=' not in item:
            result[item] = None
            continue
        name, value = item.split('=', 1)
        if value[:1] == value[-1:] == '"':
            value = unquote_header_value(value[1:-1])
        result[name] = value
    return result

# From mitsuhiko/werkzeug (used with permission).
def unquote_header_value(value, is_filename=False):
    r"""Unquotes 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
    """
    if value and value[0] == value[-1] == '"':
        # this is not the real unquoting, but fixing this so that the
        # RFC is met will result in bugs with internet explorer and
        # probably some other browsers as well.  IE for example is
        # uploading files with "C:\foo\bar.txt" as filename
        value = value[1:-1]

# if this is a filename and the starting characters look like
        # a UNC path, then just return the value without quotes.  Using the
        # replace sequence below on a UNC path has the effect of turning
        # the leading double slash into a single slash and then
        # _fix_ie_filename() doesn't work correctly.  See #458.
        if not is_filename or value[:2] != '\\\\':
            return value.replace('\\\\', '\\').replace('\\"', '"')
    return value

def dict_from_cookiejar(cj):
    """Returns a key/value dictionary from a CookieJar.

:param cj: CookieJar object to extract cookies from.
    :rtype: dict
    """

cookie_dict = {}

for cookie in cj:
        cookie_dict[cookie.name] = cookie.value

return cookie_dict

def add_dict_to_cookiejar(cj, cookie_dict):
    """Returns 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
    """

return cookiejar_from_dict(cookie_dict, cj)

def get_encodings_from_content(content):
    """Returns encodings from given content string.

:param content: bytestring to extract encodings from.
    """
    warnings.warn((
        '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.)'),
        DeprecationWarning)

charset_re = re.compile(r'<meta.*?charset=["\']*(.+?)["\'>]', flags=re.I)
    pragma_re = re.compile(r'<meta.*?content=["\']*;?charset=(.+?)["\'>]', flags=re.I)
    xml_re = re.compile(r'^<\?xml.*?encoding=["\']*(.+?)["\'>]')

return (charset_re.findall(content) +
            pragma_re.findall(content) +
            xml_re.findall(content))

def _parse_content_type_header(header):
    """Returns content type and parameters from given header

:param header: string
    :return: tuple containing content type and dictionary of
         parameters
    """

tokens = header.split(';')
    content_type, params = tokens[0].strip(), tokens[1:]
    params_dict = {}
    items_to_strip = "\"' "

for param in params:
        param = param.strip()
        if param:
            key, value = param, True
            index_of_equals = param.find("=")
            if index_of_equals != -1:
                key = param[:index_of_equals].strip(items_to_strip)
                value = param[index_of_equals + 1:].strip(items_to_strip)
            params_dict[key.lower()] = value
    return content_type, params_dict

def get_encoding_from_headers(headers):
    """Returns encodings from given HTTP Header Dict.

:param headers: dictionary to extract encoding from.
    :rtype: str
    """

content_type = headers.get('content-type')

if not content_type:
        return None

content_type, params = _parse_content_type_header(content_type)

if 'charset' in params:
        return params['charset'].strip("'\"")

if 'text' in content_type:
        return 'ISO-8859-1'

if 'application/json' in content_type:
        # Assume UTF-8 based on RFC 4627: https://www.ietf.org/rfc/rfc4627.txt since the charset was unset
        return 'utf-8'

def stream_decode_response_unicode(iterator, r):
    """Stream decodes a iterator."""

if r.encoding is None:
        for item in iterator:
            yield item
        return

decoder = codecs.getincrementaldecoder(r.encoding)(errors='replace')
    for chunk in iterator:
        rv = decoder.decode(chunk)
        if rv:
            yield rv
    rv = decoder.decode(b'', final=True)
    if rv:
        yield rv

def iter_slices(string, slice_length):
    """Iterate over slices of a string."""
    pos = 0
    if slice_length is None or slice_length <= 0:
        slice_length = len(string)
    while pos < len(string):
        yield string[pos:pos + slice_length]
        pos += slice_length

def get_unicode_from_response(r):
    """Returns 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
    """
    warnings.warn((
        '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.)'),
        DeprecationWarning)

tried_encodings = []

# Try charset from content-type
    encoding = get_encoding_from_headers(r.headers)

if encoding:
        try:
            return str(r.content, encoding)
        except UnicodeError:
            tried_encodings.append(encoding)

# Fall back:
    try:
        return str(r.content, encoding, errors='replace')
    except TypeError:
        return r.content

# The unreserved URI characters (RFC 3986)
UNRESERVED_SET = frozenset(
    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" + "0123456789-._~")

def unquote_unreserved(uri):
    """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
    """
    parts = uri.split('%')
    for i in range(1, len(parts)):
        h = parts[i][0:2]
        if len(h) == 2 and h.isalnum():
            try:
                c = chr(int(h, 16))
            except ValueError:
                raise InvalidURL("Invalid percent-escape sequence: '%s'" % h)

if c in UNRESERVED_SET:
                parts[i] = c + parts[i][2:]
            else:
                parts[i] = '%' + parts[i]
        else:
            parts[i] = '%' + parts[i]
    return ''.join(parts)

def requote_uri(uri):
    """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
    """
    safe_with_percent = "!#$%&'()*+,/:;=?@[]~"
    safe_without_percent = "!#$&'()*+,/:;=?@[]~"
    try:
        # Unquote only the unreserved characters
        # Then quote only illegal characters (do not quote reserved,
        # unreserved, or '%')
        return quote(unquote_unreserved(uri), safe=safe_with_percent)
    except InvalidURL:
        # We couldn't unquote the given URI, so let's try quoting it, but
        # there may be unquoted '%'s in the URI. We need to make sure they're
        # properly quoted so they do not cause issues elsewhere.
        return quote(uri, safe=safe_without_percent)

def address_in_network(ip, net):
    """This 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
    """
    ipaddr = struct.unpack('=L', socket.inet_aton(ip))[0]
    netaddr, bits = net.split('/')
    netmask = struct.unpack('=L', socket.inet_aton(dotted_netmask(int(bits))))[0]
    network = struct.unpack('=L', socket.inet_aton(netaddr))[0] & netmask
    return (ipaddr & netmask) == (network & netmask)

def dotted_netmask(mask):
    """Converts mask from /xx format to xxx.xxx.xxx.xxx

Example: if mask is 24 function returns 255.255.255.0

:rtype: str
    """
    bits = 0xffffffff ^ (1 << 32 - mask) - 1
    return socket.inet_ntoa(struct.pack('>I', bits))

def is_ipv4_address(string_ip):
    """
    :rtype: bool
    """
    try:
        socket.inet_aton(string_ip)
    except socket.error:
        return False
    return True

def is_valid_cidr(string_network):
    """
    Very simple check of the cidr format in no_proxy variable.

:rtype: bool
    """
    if string_network.count('/') == 1:
        try:
            mask = int(string_network.split('/')[1])
        except ValueError:
            return False

if mask < 1 or mask > 32:
            return False

try:
            socket.inet_aton(string_network.split('/')[0])
        except socket.error:
            return False
    else:
        return False
    return True

@contextlib.contextmanager
def set_environ(env_name, value):
    """Set 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 nothing"""
    value_changed = value is not None
    if value_changed:
        old_value = os.environ.get(env_name)
        os.environ[env_name] = value
    try:
        yield
    finally:
        if value_changed:
            if old_value is None:
                del os.environ[env_name]
            else:
                os.environ[env_name] = old_value

def should_bypass_proxies(url, no_proxy):
    """
    Returns whether we should bypass proxies or not.

:rtype: bool
    """
    # Prioritize lowercase environment variables over uppercase
    # to keep a consistent behaviour with other http projects (curl, wget).
    get_proxy = lambda k: os.environ.get(k) or os.environ.get(k.upper())

# First check whether no_proxy is defined. If it is, check that the URL
    # we're getting isn't in the no_proxy list.
    no_proxy_arg = no_proxy
    if no_proxy is None:
        no_proxy = get_proxy('no_proxy')
    parsed = urlparse(url)

if parsed.hostname is None:
        # URLs don't always have hostnames, e.g. file:/// urls.
        return True

if no_proxy:
        # We need to check whether we match here. We need to see if we match
        # the end of the hostname, both with and without the port.
        no_proxy = (
            host for host in no_proxy.replace(' ', '').split(',') if host
        )

if is_ipv4_address(parsed.hostname):
            for proxy_ip in no_proxy:
                if is_valid_cidr(proxy_ip):
                    if address_in_network(parsed.hostname, proxy_ip):
                        return True
                elif parsed.hostname == proxy_ip:
                    # If no_proxy ip was defined in plain IP notation instead of cidr notation &
                    # matches the IP of the index
                    return True
        else:
            host_with_port = parsed.hostname
            if parsed.port:
                host_with_port += ':{}'.format(parsed.port)

for host in no_proxy:
                if parsed.hostname.endswith(host) or host_with_port.endswith(host):
                    # The URL does match something in no_proxy, so we don't want
                    # to apply the proxies on this URL.
                    return True

with set_environ('no_proxy', no_proxy_arg):
        # parsed.hostname can be `None` in cases such as a file URI.
        try:
            bypass = proxy_bypass(parsed.hostname)
        except (TypeError, socket.gaierror):
            bypass = False

if bypass:
        return True

return False

def get_environ_proxies(url, no_proxy=None):
    """
    Return a dict of environment proxies.

:rtype: dict
    """
    if should_bypass_proxies(url, no_proxy=no_proxy):
        return {}
    else:
        return getproxies()

def select_proxy(url, proxies):
    """Select 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
    """
    proxies = proxies or {}
    urlparts = urlparse(url)
    if urlparts.hostname is None:
        return proxies.get(urlparts.scheme, proxies.get('all'))

proxy_keys = [
        urlparts.scheme + '://' + urlparts.hostname,
        urlparts.scheme,
        'all://' + urlparts.hostname,
        'all',
    ]
    proxy = None
    for proxy_key in proxy_keys:
        if proxy_key in proxies:
            proxy = proxies[proxy_key]
            break

return proxy

def default_user_agent(name="python-requests"):
    """
    Return a string representing the default user agent.

:rtype: str
    """
    return '%s/%s' % (name, __version__)

def default_headers():
    """
    :rtype: requests.structures.CaseInsensitiveDict
    """
    return CaseInsensitiveDict({
        'User-Agent': default_user_agent(),
        'Accept-Encoding': ', '.join(('gzip', 'deflate')),
        'Accept': '*/*',
        'Connection': 'keep-alive',
    })

def parse_header_links(value):
    """Return a list 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
    """

links = []

replace_chars = ' \'"'

value = value.strip(replace_chars)
    if not value:
        return links

for val in re.split(', *<', value):
        try:
            url, params = val.split(';', 1)
        except ValueError:
            url, params = val, ''

link = {'url': url.strip('<> \'"')}

for param in params.split(';'):
            try:
                key, value = param.split('=')
            except ValueError:
                break

link[key.strip(replace_chars)] = value.strip(replace_chars)

links.append(link)

return links

# Null bytes; no need to recreate these on each call to guess_json_utf
_null = '\x00'.encode('ascii')  # encoding to ASCII for Python 3
_null2 = _null * 2
_null3 = _null * 3

def guess_json_utf(data):
    """
    :rtype: str
    """
    # JSON always starts with two ASCII characters, so detection is as
    # easy as counting the nulls and from their location and count
    # determine the encoding. Also detect a BOM, if present.
    sample = data[:4]
    if sample in (codecs.BOM_UTF32_LE, codecs.BOM_UTF32_BE):
        return 'utf-32'     # BOM included
    if sample[:3] == codecs.BOM_UTF8:
        return 'utf-8-sig'  # BOM included, MS style (discouraged)
    if sample[:2] in (codecs.BOM_UTF16_LE, codecs.BOM_UTF16_BE):
        return 'utf-16'     # BOM included
    nullcount = sample.count(_null)
    if nullcount == 0:
        return 'utf-8'
    if nullcount == 2:
        if sample[::2] == _null2:   # 1st and 3rd are null
            return 'utf-16-be'
        if sample[1::2] == _null2:  # 2nd and 4th are null
            return 'utf-16-le'
        # Did not detect 2 valid UTF-16 ascii-range characters
    if nullcount == 3:
        if sample[:3] == _null3:
            return 'utf-32-be'
        if sample[1:] == _null3:
            return 'utf-32-le'
        # Did not detect a valid UTF-32 ascii-range character
    return None

def prepend_scheme_if_needed(url, new_scheme):
    """Given 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
    """
    scheme, netloc, path, params, query, fragment = urlparse(url, new_scheme)

# urlparse is a finicky beast, and sometimes decides that there isn't a
    # netloc present. Assume that it's being over-cautious, and switch netloc
    # and path if urlparse decided there was no netloc.
    if not netloc:
        netloc, path = path, netloc

return urlunparse((scheme, netloc, path, params, query, fragment))

def get_auth_from_url(url):
    """Given a url with authentication components, extract them into a tuple of
    username,password.

:rtype: (str,str)
    """
    parsed = urlparse(url)

try:
        auth = (unquote(parsed.username), unquote(parsed.password))
    except (AttributeError, TypeError):
        auth = ('', '')

return auth

# Moved outside of function to avoid recompile every call
_CLEAN_HEADER_REGEX_BYTE = re.compile(b'^\\S[^\\r\\n]*$|^$')
_CLEAN_HEADER_REGEX_STR = re.compile(r'^\S[^\r\n]*$|^$')

def check_header_validity(header):
    """Verifies 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).
    """
    name, value = header

if isinstance(value, bytes):
        pat = _CLEAN_HEADER_REGEX_BYTE
    else:
        pat = _CLEAN_HEADER_REGEX_STR
    try:
        if not pat.match(value):
            raise InvalidHeader("Invalid return character or leading space in header: %s" % name)
    except TypeError:
        raise InvalidHeader("Value for header {%s: %s} must be of type str or "
                            "bytes, not %s" % (name, value, type(value)))

def urldefragauth(url):
    """
    Given a url remove the fragment and the authentication part.

:rtype: str
    """
    scheme, netloc, path, params, query, fragment = urlparse(url)

# see func:`prepend_scheme_if_needed`
    if not netloc:
        netloc, path = path, netloc

netloc = netloc.rsplit('@', 1)[-1]

return urlunparse((scheme, netloc, path, params, query, ''))

def rewind_body(prepared_request):
    """Move file pointer back to its recorded starting position
    so it can be read again on redirect.
    """
    body_seek = getattr(prepared_request.body, 'seek', None)
    if body_seek is not None and isinstance(prepared_request._body_position, integer_types):
        try:
            body_seek(prepared_request._body_position)
        except (IOError, OSError):
            raise UnrewindableBodyError("An error occurred when rewinding request "
                                        "body for redirect.")
    else:
        raise UnrewindableBodyError("Unable to rewind request body for redirect.")

Cancel

Listing directory:

Name	Size	Modify	Owner/Group	Perms	Action	Select
__init__.py	4.04 KB	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
__pycache__	DIR	17.06.2025 06:32:31	0/0	drwxr-xr-x	Edit Rename
__version__.py	441 B	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
_internal_utils.py	1.07 KB	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
adapters.py	20.84 KB	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
api.py	6.34 KB	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
auth.py	9.97 KB	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
certs.py	453 B	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
compat.py	1.74 KB	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
cookies.py	18 KB	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
exceptions.py	3.09 KB	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
help.py	3.43 KB	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
hooks.py	757 B	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
models.py	33.5 KB	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
packages.py	542 B	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
sessions.py	29.62 KB	11.06.2025 03:27:31	0/0	-rw-r--r--	Edit Rename Download
status_codes.py	4.09 KB	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
structures.py	2.93 KB	16.12.2020 19:34:26	0/0	-rw-r--r--	Edit Rename Download
utils.py	29.55 KB	11.06.2025 03:27:31	0/0	-rw-r--r--	Edit Rename Download

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