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Edit File : fields.py \| Size : 8.38 KB
from __future__ import absolute_import import email.utils import mimetypes import re from .packages import six def guess_content_type(filename, default="application/octet-stream"): """ Guess the "Content-Type" of a file. :param filename: The filename to guess the "Content-Type" of using :mod:`mimetypes`. :param default: If no "Content-Type" can be guessed, default to `default`. """ if filename: return mimetypes.guess_type(filename)[0] or default return default def format_header_param_rfc2231(name, value): """ Helper function to format and quote a single header parameter using the strategy defined in RFC 2231. Particularly useful for header parameters which might contain non-ASCII values, like file names. This follows `RFC 2388 Section 4.4 <https://tools.ietf.org/html/rfc2388#section-4.4>`_. :param name: The name of the parameter, a string expected to be ASCII only. :param value: The value of the parameter, provided as ``bytes`` or `str``. :ret: An RFC-2231-formatted unicode string. """ if isinstance(value, six.binary_type): value = value.decode("utf-8") if not any(ch in value for ch in '"\\\r\n'): result = u'%s="%s"' % (name, value) try: result.encode("ascii") except (UnicodeEncodeError, UnicodeDecodeError): pass else: return result if six.PY2: # Python 2: value = value.encode("utf-8") # encode_rfc2231 accepts an encoded string and returns an ascii-encoded # string in Python 2 but accepts and returns unicode strings in Python 3 value = email.utils.encode_rfc2231(value, "utf-8") value = "%s=%s" % (name, value) if six.PY2: # Python 2: value = value.decode("utf-8") return value _HTML5_REPLACEMENTS = { u"\u0022": u"%22", # Replace "\" with "\\". u"\u005C": u"\u005C\u005C", } # All control characters from 0x00 to 0x1F except* 0x1B. _HTML5_REPLACEMENTS.update( { six.unichr(cc): u"%{:02X}".format(cc) for cc in range(0x00, 0x1F + 1) if cc not in (0x1B,) } ) def _replace_multiple(value, needles_and_replacements): def replacer(match): return needles_and_replacements[match.group(0)] pattern = re.compile( r"\|".join([re.escape(needle) for needle in needles_and_replacements.keys()]) ) result = pattern.sub(replacer, value) return result def format_header_param_html5(name, value): """ Helper function to format and quote a single header parameter using the HTML5 strategy. Particularly useful for header parameters which might contain non-ASCII values, like file names. This follows the `HTML5 Working Draft Section 4.10.22.7`_ and matches the behavior of curl and modern browsers. .. _HTML5 Working Draft Section 4.10.22.7: https://w3c.github.io/html/sec-forms.html#multipart-form-data :param name: The name of the parameter, a string expected to be ASCII only. :param value: The value of the parameter, provided as ``bytes`` or `str``. :ret: A unicode string, stripped of troublesome characters. """ if isinstance(value, six.binary_type): value = value.decode("utf-8") value = _replace_multiple(value, _HTML5_REPLACEMENTS) return u'%s="%s"' % (name, value) # For backwards-compatibility. format_header_param = format_header_param_html5 class RequestField(object): """ A data container for request body parameters. :param name: The name of this request field. Must be unicode. :param data: The data/value body. :param filename: An optional filename of the request field. Must be unicode. :param headers: An optional dict-like object of headers to initially use for the field. :param header_formatter: An optional callable that is used to encode and format the headers. By default, this is :func:`format_header_param_html5`. """ def __init__( self, name, data, filename=None, headers=None, header_formatter=format_header_param_html5, ): self._name = name self._filename = filename self.data = data self.headers = {} if headers: self.headers = dict(headers) self.header_formatter = header_formatter @classmethod def from_tuples(cls, fieldname, value, header_formatter=format_header_param_html5): """ A :class:`~urllib3.fields.RequestField` factory from old-style tuple parameters. Supports constructing :class:`~urllib3.fields.RequestField` from parameter of key/value strings AND key/filetuple. A filetuple is a (filename, data, MIME type) tuple where the MIME type is optional. For example:: 'foo': 'bar', 'fakefile': ('foofile.txt', 'contents of foofile'), 'realfile': ('barfile.txt', open('realfile').read()), 'typedfile': ('bazfile.bin', open('bazfile').read(), 'image/jpeg'), 'nonamefile': 'contents of nonamefile field', Field names and filenames must be unicode. """ if isinstance(value, tuple): if len(value) == 3: filename, data, content_type = value else: filename, data = value content_type = guess_content_type(filename) else: filename = None content_type = None data = value request_param = cls( fieldname, data, filename=filename, header_formatter=header_formatter ) request_param.make_multipart(content_type=content_type) return request_param def _render_part(self, name, value): """ Overridable helper function to format a single header parameter. By default, this calls ``self.header_formatter``. :param name: The name of the parameter, a string expected to be ASCII only. :param value: The value of the parameter, provided as a unicode string. """ return self.header_formatter(name, value) def _render_parts(self, header_parts): """ Helper function to format and quote a single header. Useful for single headers that are composed of multiple items. E.g., 'Content-Disposition' fields. :param header_parts: A sequence of (k, v) tuples or a :class:`dict` of (k, v) to format as `k1="v1"; k2="v2"; ...`. """ parts = [] iterable = header_parts if isinstance(header_parts, dict): iterable = header_parts.items() for name, value in iterable: if value is not None: parts.append(self._render_part(name, value)) return u"; ".join(parts) def render_headers(self): """ Renders the headers for this request field. """ lines = [] sort_keys = ["Content-Disposition", "Content-Type", "Content-Location"] for sort_key in sort_keys: if self.headers.get(sort_key, False): lines.append(u"%s: %s" % (sort_key, self.headers[sort_key])) for header_name, header_value in self.headers.items(): if header_name not in sort_keys: if header_value: lines.append(u"%s: %s" % (header_name, header_value)) lines.append(u"\r\n") return u"\r\n".join(lines) def make_multipart( self, content_disposition=None, content_type=None, content_location=None ): """ Makes this request field into a multipart request field. This method overrides "Content-Disposition", "Content-Type" and "Content-Location" headers to the request parameter. :param content_type: The 'Content-Type' of the request body. :param content_location: The 'Content-Location' of the request body. """ self.headers["Content-Disposition"] = content_disposition or u"form-data" self.headers["Content-Disposition"] += u"; ".join( [ u"", self._render_parts( ((u"name", self._name), (u"filename", self._filename)) ), ] ) self.headers["Content-Type"] = content_type self.headers["Content-Location"] = content_location Back

Edit File : fields.py | Size : 8.38 KB

from __future__ import absolute_import

import email.utils
import mimetypes
import re

from .packages import six

def guess_content_type(filename, default="application/octet-stream"):
    """
    Guess the "Content-Type" of a file.

:param filename:
        The filename to guess the "Content-Type" of using :mod:`mimetypes`.
    :param default:
        If no "Content-Type" can be guessed, default to `default`.
    """
    if filename:
        return mimetypes.guess_type(filename)[0] or default
    return default

def format_header_param_rfc2231(name, value):
    """
    Helper function to format and quote a single header parameter using the
    strategy defined in RFC 2231.

Particularly useful for header parameters which might contain
    non-ASCII values, like file names. This follows
    `RFC 2388 Section 4.4 <https://tools.ietf.org/html/rfc2388#section-4.4>`_.

:param name:
        The name of the parameter, a string expected to be ASCII only.
    :param value:
        The value of the parameter, provided as ``bytes`` or `str``.
    :ret:
        An RFC-2231-formatted unicode string.
    """
    if isinstance(value, six.binary_type):
        value = value.decode("utf-8")

if not any(ch in value for ch in '"\\\r\n'):
        result = u'%s="%s"' % (name, value)
        try:
            result.encode("ascii")
        except (UnicodeEncodeError, UnicodeDecodeError):
            pass
        else:
            return result

if six.PY2:  # Python 2:
        value = value.encode("utf-8")

# encode_rfc2231 accepts an encoded string and returns an ascii-encoded
    # string in Python 2 but accepts and returns unicode strings in Python 3
    value = email.utils.encode_rfc2231(value, "utf-8")
    value = "%s*=%s" % (name, value)

if six.PY2:  # Python 2:
        value = value.decode("utf-8")

return value

_HTML5_REPLACEMENTS = {
    u"\u0022": u"%22",
    # Replace "\" with "\\".
    u"\u005C": u"\u005C\u005C",
}

# All control characters from 0x00 to 0x1F *except* 0x1B.
_HTML5_REPLACEMENTS.update(
    {
        six.unichr(cc): u"%{:02X}".format(cc)
        for cc in range(0x00, 0x1F + 1)
        if cc not in (0x1B,)
    }
)

def _replace_multiple(value, needles_and_replacements):
    def replacer(match):
        return needles_and_replacements[match.group(0)]

pattern = re.compile(
        r"|".join([re.escape(needle) for needle in needles_and_replacements.keys()])
    )

result = pattern.sub(replacer, value)

return result

def format_header_param_html5(name, value):
    """
    Helper function to format and quote a single header parameter using the
    HTML5 strategy.

Particularly useful for header parameters which might contain
    non-ASCII values, like file names. This follows the `HTML5 Working Draft
    Section 4.10.22.7`_ and matches the behavior of curl and modern browsers.

.. _HTML5 Working Draft Section 4.10.22.7:
        https://w3c.github.io/html/sec-forms.html#multipart-form-data

:param name:
        The name of the parameter, a string expected to be ASCII only.
    :param value:
        The value of the parameter, provided as ``bytes`` or `str``.
    :ret:
        A unicode string, stripped of troublesome characters.
    """
    if isinstance(value, six.binary_type):
        value = value.decode("utf-8")

value = _replace_multiple(value, _HTML5_REPLACEMENTS)

return u'%s="%s"' % (name, value)

# For backwards-compatibility.
format_header_param = format_header_param_html5

class RequestField(object):
    """
    A data container for request body parameters.

:param name:
        The name of this request field. Must be unicode.
    :param data:
        The data/value body.
    :param filename:
        An optional filename of the request field. Must be unicode.
    :param headers:
        An optional dict-like object of headers to initially use for the field.
    :param header_formatter:
        An optional callable that is used to encode and format the headers. By
        default, this is :func:`format_header_param_html5`.
    """

def __init__(
        self,
        name,
        data,
        filename=None,
        headers=None,
        header_formatter=format_header_param_html5,
    ):
        self._name = name
        self._filename = filename
        self.data = data
        self.headers = {}
        if headers:
            self.headers = dict(headers)
        self.header_formatter = header_formatter

@classmethod
    def from_tuples(cls, fieldname, value, header_formatter=format_header_param_html5):
        """
        A :class:`~urllib3.fields.RequestField` factory from old-style tuple parameters.

Supports constructing :class:`~urllib3.fields.RequestField` from
        parameter of key/value strings AND key/filetuple. A filetuple is a
        (filename, data, MIME type) tuple where the MIME type is optional.
        For example::

'foo': 'bar',
            'fakefile': ('foofile.txt', 'contents of foofile'),
            'realfile': ('barfile.txt', open('realfile').read()),
            'typedfile': ('bazfile.bin', open('bazfile').read(), 'image/jpeg'),
            'nonamefile': 'contents of nonamefile field',

Field names and filenames must be unicode.
        """
        if isinstance(value, tuple):
            if len(value) == 3:
                filename, data, content_type = value
            else:
                filename, data = value
                content_type = guess_content_type(filename)
        else:
            filename = None
            content_type = None
            data = value

request_param = cls(
            fieldname, data, filename=filename, header_formatter=header_formatter
        )
        request_param.make_multipart(content_type=content_type)

return request_param

def _render_part(self, name, value):
        """
        Overridable helper function to format a single header parameter. By
        default, this calls ``self.header_formatter``.

:param name:
            The name of the parameter, a string expected to be ASCII only.
        :param value:
            The value of the parameter, provided as a unicode string.
        """

return self.header_formatter(name, value)

def _render_parts(self, header_parts):
        """
        Helper function to format and quote a single header.

Useful for single headers that are composed of multiple items. E.g.,
        'Content-Disposition' fields.

:param header_parts:
            A sequence of (k, v) tuples or a :class:`dict` of (k, v) to format
            as `k1="v1"; k2="v2"; ...`.
        """
        parts = []
        iterable = header_parts
        if isinstance(header_parts, dict):
            iterable = header_parts.items()

for name, value in iterable:
            if value is not None:
                parts.append(self._render_part(name, value))

return u"; ".join(parts)

def render_headers(self):
        """
        Renders the headers for this request field.
        """
        lines = []

sort_keys = ["Content-Disposition", "Content-Type", "Content-Location"]
        for sort_key in sort_keys:
            if self.headers.get(sort_key, False):
                lines.append(u"%s: %s" % (sort_key, self.headers[sort_key]))

for header_name, header_value in self.headers.items():
            if header_name not in sort_keys:
                if header_value:
                    lines.append(u"%s: %s" % (header_name, header_value))

lines.append(u"\r\n")
        return u"\r\n".join(lines)

def make_multipart(
        self, content_disposition=None, content_type=None, content_location=None
    ):
        """
        Makes this request field into a multipart request field.

This method overrides "Content-Disposition", "Content-Type" and
        "Content-Location" headers to the request parameter.

:param content_type:
            The 'Content-Type' of the request body.
        :param content_location:
            The 'Content-Location' of the request body.

"""
        self.headers["Content-Disposition"] = content_disposition or u"form-data"
        self.headers["Content-Disposition"] += u"; ".join(
            [
                u"",
                self._render_parts(
                    ((u"name", self._name), (u"filename", self._filename))
                ),
            ]
        )
        self.headers["Content-Type"] = content_type
        self.headers["Content-Location"] = content_location

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