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"""
distutils.command.upload

Implements the Distutils 'upload' subcommand (upload package to a package
index).
"""

import os
import io
import hashlib
from base64 import standard_b64encode
from urllib.error import HTTPError
from urllib.request import urlopen, Request
from urllib.parse import urlparse
from distutils.errors import DistutilsError, DistutilsOptionError
from distutils.core import PyPIRCCommand
from distutils.spawn import spawn
from distutils import log


# PyPI Warehouse supports MD5, SHA256, and Blake2 (blake2-256)
# https://bugs.python.org/issue40698
_FILE_CONTENT_DIGESTS = {
    "md5_digest": getattr(hashlib, "md5", None),
    "sha256_digest": getattr(hashlib, "sha256", None),
    "blake2_256_digest": getattr(hashlib, "blake2b", None),
}


class upload(PyPIRCCommand):

    description = "upload binary package to PyPI"

    user_options = PyPIRCCommand.user_options + [
        ('sign', 's',
         'sign files to upload using gpg'),
        ('identity=', 'i', 'GPG identity used to sign files'),
        ]

    boolean_options = PyPIRCCommand.boolean_options + ['sign']

    def initialize_options(self):
        PyPIRCCommand.initialize_options(self)
        self.username = ''
        self.password = ''
        self.show_response = 0
        self.sign = False
        self.identity = None

    def finalize_options(self):
        PyPIRCCommand.finalize_options(self)
        if self.identity and not self.sign:
            raise DistutilsOptionError(
                "Must use --sign for --identity to have meaning"
            )
        config = self._read_pypirc()
        if config != {}:
            self.username = config['username']
            self.password = config['password']
            self.repository = config['repository']
            self.realm = config['realm']

        # getting the password from the distribution
        # if previously set by the register command
        if not self.password and self.distribution.password:
            self.password = self.distribution.password

    def run(self):
        if not self.distribution.dist_files:
            msg = ("Must create and upload files in one command "
                   "(e.g. setup.py sdist upload)")
            raise DistutilsOptionError(msg)
        for command, pyversion, filename in self.distribution.dist_files:
            self.upload_file(command, pyversion, filename)

    def upload_file(self, command, pyversion, filename):
        # Makes sure the repository URL is compliant
        schema, netloc, url, params, query, fragments = \
            urlparse(self.repository)
        if params or query or fragments:
            raise AssertionError("Incompatible url %s" % self.repository)

        if schema not in ('http', 'https'):
            raise AssertionError("unsupported schema " + schema)

        # Sign if requested
        if self.sign:
            gpg_args = ["gpg", "--detach-sign", "-a", filename]
            if self.identity:
                gpg_args[2:2] = ["--local-user", self.identity]
            spawn(gpg_args,
                  dry_run=self.dry_run)

        # Fill in the data - send all the meta-data in case we need to
        # register a new release
        f = open(filename,'rb')
        try:
            content = f.read()
        finally:
            f.close()

        meta = self.distribution.metadata
        data = {
            # action
            ':action': 'file_upload',
            'protocol_version': '1',

            # identify release
            'name': meta.get_name(),
            'version': meta.get_version(),

            # file content
            'content': (os.path.basename(filename),content),
            'filetype': command,
            'pyversion': pyversion,

            # additional meta-data
            'metadata_version': '1.0',
            'summary': meta.get_description(),
            'home_page': meta.get_url(),
            'author': meta.get_contact(),
            'author_email': meta.get_contact_email(),
            'license': meta.get_licence(),
            'description': meta.get_long_description(),
            'keywords': meta.get_keywords(),
            'platform': meta.get_platforms(),
            'classifiers': meta.get_classifiers(),
            'download_url': meta.get_download_url(),
            # PEP 314
            'provides': meta.get_provides(),
            'requires': meta.get_requires(),
            'obsoletes': meta.get_obsoletes(),
            }

        data['comment'] = ''

        # file content digests
        for digest_name, digest_cons in _FILE_CONTENT_DIGESTS.items():
            if digest_cons is None:
                continue
            try:
                data[digest_name] = digest_cons(content).hexdigest()
            except ValueError:
                # hash digest not available or blocked by security policy
                pass

        if self.sign:
            with open(filename + ".asc", "rb") as f:
                data['gpg_signature'] = (os.path.basename(filename) + ".asc",
                                         f.read())

        # set up the authentication
        user_pass = (self.username + ":" + self.password).encode('ascii')
        # The exact encoding of the authentication string is debated.
        # Anyway PyPI only accepts ascii for both username or password.
        auth = "Basic " + standard_b64encode(user_pass).decode('ascii')

        # Build up the MIME payload for the POST data
        boundary = '--------------GHSKFJDLGDS7543FJKLFHRE75642756743254'
        sep_boundary = b'\r\n--' + boundary.encode('ascii')
        end_boundary = sep_boundary + b'--\r\n'
        body = io.BytesIO()
        for key, value in data.items():
            title = '\r\nContent-Disposition: form-data; name="%s"' % key
            # handle multiple entries for the same name
            if not isinstance(value, list):
                value = [value]
            for value in value:
                if type(value) is tuple:
                    title += '; filename="%s"' % value[0]
                    value = value[1]
                else:
                    value = str(value).encode('utf-8')
                body.write(sep_boundary)
                body.write(title.encode('utf-8'))
                body.write(b"\r\n\r\n")
                body.write(value)
        body.write(end_boundary)
        body = body.getvalue()

        msg = "Submitting %s to %s" % (filename, self.repository)
        self.announce(msg, log.INFO)

        # build the Request
        headers = {
            'Content-type': 'multipart/form-data; boundary=%s' % boundary,
            'Content-length': str(len(body)),
            'Authorization': auth,
        }

        request = Request(self.repository, data=body,
                          headers=headers)
        # send the data
        try:
            result = urlopen(request)
            status = result.getcode()
            reason = result.msg
        except HTTPError as e:
            status = e.code
            reason = e.msg
        except OSError as e:
            self.announce(str(e), log.ERROR)
            raise

        if status == 200:
            self.announce('Server response (%s): %s' % (status, reason),
                          log.INFO)
            if self.show_response:
                text = self._read_pypi_response(result)
                msg = '\n'.join(('-' * 75, text, '-' * 75))
                self.announce(msg, log.INFO)
        else:
            msg = 'Upload failed (%s): %s' % (status, reason)
            self.announce(msg, log.ERROR)
            raise DistutilsError(msg)