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