text: # Copyright 2015 Ian Cordasco
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  # http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  from __future__ import absolute_import, unicode_literals, print_function
  
  from tqdm import tqdm
  
  import requests
  from requests import adapters
  from requests import codes
  from requests.packages.urllib3 import util
  from requests_toolbelt.multipart import (
      MultipartEncoder, MultipartEncoderMonitor
  )
  from requests_toolbelt.utils import user_agent
  
  import twine
  
  KEYWORDS_TO_NOT_FLATTEN = set(["gpg_signature", "content"])
  
  LEGACY_PYPI = 'https://pypi.python.org/'
  WAREHOUSE = 'https://upload.pypi.org/'
  OLD_WAREHOUSE = 'https://upload.pypi.io/'
  
  
  class ProgressBar(tqdm):
      def update_to(self, n):
          """Update the bar in the way compatible with requests-toolbelt.
  
          This is identical to tqdm.update, except ``n`` will be the current
          value - not the delta as tqdm expects.
          """
          self.update(n - self.n)  # will also do self.n = n
  
  
  class Repository(object):
      def __init__(self, repository_url, username, password):
          self.url = repository_url
          self.session = requests.session()
          self.session.auth = (username, password)
          self.session.headers['User-Agent'] = self._make_user_agent_string()
          for scheme in ('http://', 'https://'):
              self.session.mount(scheme, self._make_adapter_with_retries())
          self._releases_json_data = {}
  
      @staticmethod
      def _make_adapter_with_retries():
          retry = util.Retry(
              connect=5,
              total=10,
              method_whitelist=['GET'],
              status_forcelist=[500, 501, 502, 503],
          )
          return adapters.HTTPAdapter(max_retries=retry)
  
      @staticmethod
      def _make_user_agent_string():
          from twine import cli
          dependencies = cli.list_dependencies_and_versions()
          return user_agent.UserAgentBuilder(
                  'twine', twine.__version__,
              ).include_extras(
                  dependencies
              ).include_implementation().build()
  
      def close(self):
          self.session.close()
  
      @staticmethod
      def _convert_data_to_list_of_tuples(data):
          data_to_send = []
          for key, value in data.items():
              if (key in KEYWORDS_TO_NOT_FLATTEN or
                      not isinstance(value, (list, tuple))):
                  data_to_send.append((key, value))
              else:
                  for item in value:
                      data_to_send.append((key, item))
          return data_to_send
  
      def set_certificate_authority(self, cacert):
          if cacert:
              self.session.verify = cacert
  
      def set_client_certificate(self, clientcert):
          if clientcert:
              self.session.cert = clientcert
  
      def register(self, package):
          data = package.metadata_dictionary()
          data.update({
              ":action": "submit",
              "protocol_version": "1",
          })
  
          print("Registering {0}".format(package.basefilename))
  
          data_to_send = self._convert_data_to_list_of_tuples(data)
          encoder = MultipartEncoder(data_to_send)
          resp = self.session.post(
              self.url,
              data=encoder,
              allow_redirects=False,
              headers={'Content-Type': encoder.content_type},
          )
          # Bug 28. Try to silence a ResourceWarning by releasing the socket.
          resp.close()
          return resp
  
      def _upload(self, package):
          data = package.metadata_dictionary()
          data.update({
              # action
              ":action": "file_upload",
              "protcol_version": "1",
          })
  
          data_to_send = self._convert_data_to_list_of_tuples(data)
  
          print("Uploading {0}".format(package.basefilename))
  
          with open(package.filename, "rb") as fp:
              data_to_send.append((
                  "content",
                  (package.basefilename, fp, "application/octet-stream"),
              ))
              encoder = MultipartEncoder(data_to_send)
              with ProgressBar(total=encoder.len,
                               unit='B', unit_scale=True, unit_divisor=1024,
                               miniters=1) as bar:
                  monitor = MultipartEncoderMonitor(
                      encoder, lambda monitor: bar.update_to(monitor.bytes_read)
                  )
  
                  resp = self.session.post(
                      self.url,
                      data=monitor,
                      allow_redirects=False,
                      headers={'Content-Type': monitor.content_type},
                  )
  
          return resp
  
      def upload(self, package, max_redirects=5):
          number_of_redirects = 0
          while number_of_redirects < max_redirects:
              resp = self._upload(package)
  
              if resp.status_code == codes.OK:
                  return resp
              if 500 <= resp.status_code < 600:
                  number_of_redirects += 1
                  print('Received "{status_code}: {reason}" Package upload '
                        'appears to have failed.  Retry {retry} of 5'.format(
                            status_code=resp.status_code,
                            reason=resp.reason,
                            retry=number_of_redirects,
                        ))
              else:
                  return resp
  
          return resp
  
      def package_is_uploaded(self, package, bypass_cache=False):
          # NOTE(sigmavirus24): Not all indices are PyPI and pypi.io doesn't
          # have a similar interface for finding the package versions.
          if not self.url.startswith((LEGACY_PYPI, WAREHOUSE, OLD_WAREHOUSE)):
              return False
  
          safe_name = package.safe_name
          releases = None
  
          if not bypass_cache:
              releases = self._releases_json_data.get(safe_name)
  
          if releases is None:
              url = '{url}pypi/{package}/json'.format(package=safe_name,
                                                      url=LEGACY_PYPI)
              headers = {'Accept': 'application/json'}
              response = self.session.get(url, headers=headers)
              if response.status_code == 200:
                  releases = response.json()['releases']
              else:
                  releases = {}
              self._releases_json_data[safe_name] = releases
  
          packages = releases.get(package.metadata.version, [])
  
          for uploaded_package in packages:
              if uploaded_package['filename'] == package.basefilename:
                  return True
  
          return False
  
      def verify_package_integrity(self, package):
          # TODO(sigmavirus24): Add a way for users to download the package and
          # check it's hash against what it has locally.
          pass
  