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annotate env/lib/python3.9/site-packages/urllib3/util/response.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 from __future__ import absolute_import
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2
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3 from email.errors import MultipartInvariantViolationDefect, StartBoundaryNotFoundDefect
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4
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5 from ..exceptions import HeaderParsingError
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6 from ..packages.six.moves import http_client as httplib
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7
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8
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9 def is_fp_closed(obj):
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10 """
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11 Checks whether a given file-like object is closed.
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12
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13 :param obj:
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14 The file-like object to check.
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15 """
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16
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17 try:
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18 # Check `isclosed()` first, in case Python3 doesn't set `closed`.
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19 # GH Issue #928
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20 return obj.isclosed()
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21 except AttributeError:
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22 pass
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23
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24 try:
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25 # Check via the official file-like-object way.
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26 return obj.closed
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27 except AttributeError:
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28 pass
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29
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30 try:
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31 # Check if the object is a container for another file-like object that
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32 # gets released on exhaustion (e.g. HTTPResponse).
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33 return obj.fp is None
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34 except AttributeError:
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35 pass
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36
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37 raise ValueError("Unable to determine whether fp is closed.")
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38
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39
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40 def assert_header_parsing(headers):
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41 """
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42 Asserts whether all headers have been successfully parsed.
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43 Extracts encountered errors from the result of parsing headers.
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44
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45 Only works on Python 3.
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46
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47 :param http.client.HTTPMessage headers: Headers to verify.
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48
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49 :raises urllib3.exceptions.HeaderParsingError:
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50 If parsing errors are found.
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51 """
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52
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53 # This will fail silently if we pass in the wrong kind of parameter.
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54 # To make debugging easier add an explicit check.
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55 if not isinstance(headers, httplib.HTTPMessage):
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56 raise TypeError("expected httplib.Message, got {0}.".format(type(headers)))
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57
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58 defects = getattr(headers, "defects", None)
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59 get_payload = getattr(headers, "get_payload", None)
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60
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61 unparsed_data = None
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62 if get_payload:
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63 # get_payload is actually email.message.Message.get_payload;
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64 # we're only interested in the result if it's not a multipart message
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65 if not headers.is_multipart():
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66 payload = get_payload()
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67
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68 if isinstance(payload, (bytes, str)):
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69 unparsed_data = payload
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70 if defects:
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71 # httplib is assuming a response body is available
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72 # when parsing headers even when httplib only sends
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73 # header data to parse_headers() This results in
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74 # defects on multipart responses in particular.
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75 # See: https://github.com/urllib3/urllib3/issues/800
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76
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77 # So we ignore the following defects:
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78 # - StartBoundaryNotFoundDefect:
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79 # The claimed start boundary was never found.
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80 # - MultipartInvariantViolationDefect:
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81 # A message claimed to be a multipart but no subparts were found.
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82 defects = [
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83 defect
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84 for defect in defects
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85 if not isinstance(
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86 defect, (StartBoundaryNotFoundDefect, MultipartInvariantViolationDefect)
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87 )
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88 ]
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89
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90 if defects or unparsed_data:
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91 raise HeaderParsingError(defects=defects, unparsed_data=unparsed_data)
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92
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93
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94 def is_response_to_head(response):
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95 """
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96 Checks whether the request of a response has been a HEAD-request.
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97 Handles the quirks of AppEngine.
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98
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99 :param http.client.HTTPResponse response:
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100 Response to check if the originating request
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101 used 'HEAD' as a method.
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102 """
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103 # FIXME: Can we do this somehow without accessing private httplib _method?
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104 method = response._method
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105 if isinstance(method, int): # Platform-specific: Appengine
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106 return method == 3
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107 return method.upper() == "HEAD"