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# urllib3/fields.py 

# Copyright 2008-2013 Andrey Petrov and contributors (see CONTRIBUTORS.txt) 

# 

# This module is part of urllib3 and is released under 

# the MIT License: http://www.opensource.org/licenses/mit-license.php 

 

import email.utils 

import mimetypes 

 

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(name, value): 

    """ 

    Helper function to format and quote a single header parameter. 

 

    Particularly useful for header parameters which might contain 

    non-ASCII values, like file names. This follows RFC 2231, as 

    suggested by RFC 2388 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 a unicode string. 

    """ 

    if not any(ch in value for ch in '"\\\r\n'): 

        result = '%s="%s"' % (name, value) 

        try: 

            result.encode('ascii') 

        except UnicodeEncodeError: 

            pass 

        else: 

            return result 

    if not six.PY3:  # Python 2: 

        value = value.encode('utf-8') 

    value = email.utils.encode_rfc2231(value, 'utf-8') 

    value = '%s*=%s' % (name, value) 

    return value 

 

 

class RequestField(object): 

    """ 

    A data container for request body parameters. 

 

    :param name: 

        The name of this request field. 

    :param data: 

        The data/value body. 

    :param filename: 

        An optional filename of the request field. 

    :param headers: 

        An optional dict-like object of headers to initially use for the field. 

    """ 

    def __init__(self, name, data, filename=None, headers=None): 

        self._name = name 

        self._filename = filename 

        self.data = data 

        self.headers = {} 

        if headers: 

            self.headers = dict(headers) 

 

    @classmethod 

    def from_tuples(cls, fieldname, value): 

        """ 

        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) 

        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. 

 

        :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 format_header_param(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) typles 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: 

                parts.append(self._render_part(name, value)) 

 

        return '; '.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('%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('%s: %s' % (header_name, header_value)) 

 

        lines.append('\r\n') 

        return '\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 'form-data' 

        self.headers['Content-Disposition'] += '; '.join(['', self._render_parts((('name', self._name), ('filename', self._filename)))]) 

        self.headers['Content-Type'] = content_type 

        self.headers['Content-Location'] = content_location