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annotate lib/python3.8/site-packages/pip/_vendor/urllib3/filepost.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 from __future__ import absolute_import
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2 import binascii
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3 import codecs
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4 import os
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5
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6 from io import BytesIO
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7
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8 from .packages import six
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9 from .packages.six import b
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10 from .fields import RequestField
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11
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12 writer = codecs.lookup("utf-8")[3]
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13
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14
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15 def choose_boundary():
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16 """
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17 Our embarrassingly-simple replacement for mimetools.choose_boundary.
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18 """
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19 boundary = binascii.hexlify(os.urandom(16))
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20 if not six.PY2:
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21 boundary = boundary.decode("ascii")
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22 return boundary
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23
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24
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25 def iter_field_objects(fields):
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26 """
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27 Iterate over fields.
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28
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29 Supports list of (k, v) tuples and dicts, and lists of
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30 :class:`~urllib3.fields.RequestField`.
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31
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32 """
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33 if isinstance(fields, dict):
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34 i = six.iteritems(fields)
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35 else:
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36 i = iter(fields)
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37
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38 for field in i:
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39 if isinstance(field, RequestField):
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40 yield field
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41 else:
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42 yield RequestField.from_tuples(*field)
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43
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44
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45 def iter_fields(fields):
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46 """
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47 .. deprecated:: 1.6
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48
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49 Iterate over fields.
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50
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51 The addition of :class:`~urllib3.fields.RequestField` makes this function
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52 obsolete. Instead, use :func:`iter_field_objects`, which returns
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53 :class:`~urllib3.fields.RequestField` objects.
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54
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55 Supports list of (k, v) tuples and dicts.
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56 """
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57 if isinstance(fields, dict):
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58 return ((k, v) for k, v in six.iteritems(fields))
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59
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60 return ((k, v) for k, v in fields)
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61
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62
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63 def encode_multipart_formdata(fields, boundary=None):
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64 """
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65 Encode a dictionary of ``fields`` using the multipart/form-data MIME format.
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66
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67 :param fields:
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68 Dictionary of fields or list of (key, :class:`~urllib3.fields.RequestField`).
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69
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70 :param boundary:
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71 If not specified, then a random boundary will be generated using
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72 :func:`urllib3.filepost.choose_boundary`.
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73 """
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74 body = BytesIO()
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75 if boundary is None:
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76 boundary = choose_boundary()
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77
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78 for field in iter_field_objects(fields):
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79 body.write(b("--%s\r\n" % (boundary)))
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80
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81 writer(body).write(field.render_headers())
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82 data = field.data
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83
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84 if isinstance(data, int):
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85 data = str(data) # Backwards compatibility
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86
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87 if isinstance(data, six.text_type):
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88 writer(body).write(data)
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89 else:
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90 body.write(data)
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91
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92 body.write(b"\r\n")
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93
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94 body.write(b("--%s--\r\n" % (boundary)))
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95
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96 content_type = str("multipart/form-data; boundary=%s" % boundary)
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97
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98 return body.getvalue(), content_type