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"""upload_docs

Implements a Distutils 'upload_docs' subcommand (upload documentation to
sites other than PyPi such as devpi).
"""

from base64 import standard_b64encode
from distutils import log
from distutils.errors import DistutilsOptionError
import os
import socket
import zipfile
import tempfile
import shutil
import itertools
import functools
import http.client
import urllib.parse
import warnings

from .._importlib import metadata
from .. import SetuptoolsDeprecationWarning

from .upload import upload


def _encode(s):
    return s.encode('utf-8', 'surrogateescape')


class upload_docs(upload):
    # override the default repository as upload_docs isn't
    # supported by Warehouse (and won't be).
    DEFAULT_REPOSITORY = 'https://pypi.python.org/pypi/'

    description = 'Upload documentation to sites other than PyPi such as devpi'

    user_options = [
        ('repository=', 'r',
         "url of repository [default: %s]" % upload.DEFAULT_REPOSITORY),
        ('show-response', None,
         'display full response text from server'),
        ('upload-dir=', None, 'directory to upload'),
    ]
    boolean_options = upload.boolean_options

    def has_sphinx(self):
        return bool(
            self.upload_dir is None
            and metadata.entry_points(group='distutils.commands', name='build_sphinx')
        )

    sub_commands = [('build_sphinx', has_sphinx)]

    def initialize_options(self):
        upload.initialize_options(self)
        self.upload_dir = None
        self.target_dir = None

    def finalize_options(self):
        log.warn(
            "Upload_docs command is deprecated. Use Read the Docs "
            "(https://readthedocs.org) instead.")
        upload.finalize_options(self)
        if self.upload_dir is None:
            if self.has_sphinx():
                build_sphinx = self.get_finalized_command('build_sphinx')
                self.target_dir = dict(build_sphinx.builder_target_dirs)['html']
            else:
                build = self.get_finalized_command('build')
                self.target_dir = os.path.join(build.build_base, 'docs')
        else:
            self.ensure_dirname('upload_dir')
            self.target_dir = self.upload_dir
        self.announce('Using upload directory %s' % self.target_dir)

    def create_zipfile(self, filename):
        zip_file = zipfile.ZipFile(filename, "w")
        try:
            self.mkpath(self.target_dir)  # just in case
            for root, dirs, files in os.walk(self.target_dir):
                if root == self.target_dir and not files:
                    tmpl = "no files found in upload directory '%s'"
                    raise DistutilsOptionError(tmpl % self.target_dir)
                for name in files:
                    full = os.path.join(root, name)
                    relative = root[len(self.target_dir):].lstrip(os.path.sep)
                    dest = os.path.join(relative, name)
                    zip_file.write(full, dest)
        finally:
            zip_file.close()

    def run(self):
        warnings.warn(
            "upload_docs is deprecated and will be removed in a future "
            "version. Use tools like httpie or curl instead.",
            SetuptoolsDeprecationWarning,
        )

        # Run sub commands
        for cmd_name in self.get_sub_commands():
            self.run_command(cmd_name)

        tmp_dir = tempfile.mkdtemp()
        name = self.distribution.metadata.get_name()
        zip_file = os.path.join(tmp_dir, "%s.zip" % name)
        try:
            self.create_zipfile(zip_file)
            self.upload_file(zip_file)
        finally:
            shutil.rmtree(tmp_dir)

    @staticmethod
    def _build_part(item, sep_boundary):
        key, values = item
        title = '\nContent-Disposition: form-data; name="%s"' % key
        # handle multiple entries for the same name
        if not isinstance(values, list):
            values = [values]
        for value in values:
            if isinstance(value, tuple):
                title += '; filename="%s"' % value[0]
                value = value[1]
            else:
                value = _encode(value)
            yield sep_boundary
            yield _encode(title)
            yield b"\n\n"
            yield value
            if value and value[-1:] == b'\r':
                yield b'\n'  # write an extra newline (lurve Macs)

    @classmethod
    def _build_multipart(cls, data):
        """
        Build up the MIME payload for the POST data
        """
        boundary = '--------------GHSKFJDLGDS7543FJKLFHRE75642756743254'
        sep_boundary = b'\n--' + boundary.encode('ascii')
        end_boundary = sep_boundary + b'--'
        end_items = end_boundary, b"\n",
        builder = functools.partial(
            cls._build_part,
            sep_boundary=sep_boundary,
        )
        part_groups = map(builder, data.items())
        parts = itertools.chain.from_iterable(part_groups)
        body_items = itertools.chain(parts, end_items)
        content_type = 'multipart/form-data; boundary=%s' % boundary
        return b''.join(body_items), content_type

    def upload_file(self, filename):
        with open(filename, 'rb') as f:
            content = f.read()
        meta = self.distribution.metadata
        data = {
            ':action': 'doc_upload',
            'name': meta.get_name(),
            'content': (os.path.basename(filename), content),
        }
        # set up the authentication
        credentials = _encode(self.username + ':' + self.password)
        credentials = standard_b64encode(credentials).decode('ascii')
        auth = "Basic " + credentials

        body, ct = self._build_multipart(data)

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

        # build the Request
        # We can't use urllib2 since we need to send the Basic
        # auth right with the first request
        schema, netloc, url, params, query, fragments = \
            urllib.parse.urlparse(self.repository)
        assert not params and not query and not fragments
        if schema == 'http':
            conn = http.client.HTTPConnection(netloc)
        elif schema == 'https':
            conn = http.client.HTTPSConnection(netloc)
        else:
            raise AssertionError("unsupported schema " + schema)

        data = ''
        try:
            conn.connect()
            conn.putrequest("POST", url)
            content_type = ct
            conn.putheader('Content-type', content_type)
            conn.putheader('Content-length', str(len(body)))
            conn.putheader('Authorization', auth)
            conn.endheaders()
            conn.send(body)
        except socket.error as e:
            self.announce(str(e), log.ERROR)
            return

        r = conn.getresponse()
        if r.status == 200:
            msg = 'Server response (%s): %s' % (r.status, r.reason)
            self.announce(msg, log.INFO)
        elif r.status == 301:
            location = r.getheader('Location')
            if location is None:
                location = 'https://pythonhosted.org/%s/' % meta.get_name()
            msg = 'Upload successful. Visit %s' % location
            self.announce(msg, log.INFO)
        else:
            msg = 'Upload failed (%s): %s' % (r.status, r.reason)
            self.announce(msg, log.ERROR)
        if self.show_response:
            print('-' * 75, r.read(), '-' * 75)