def _listing(self, env, start_response, prefix=None):
        """
        Sends an HTML object listing to the remote client.

        :param env: The original WSGI environment dict.
        :param start_response: The original WSGI start_response hook.
        :param prefix: Any prefix desired for the container listing.
        """
        label = env['PATH_INFO']
        if self._listings_label:
            groups = env['PATH_INFO'].split('/')
            label = '{0}/{1}'.format(self._listings_label,
                                     '/'.join(groups[4:]))

        if not config_true_value(self._listings):
            body = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 ' \
                'Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">\n' \
                '<html>\n' \
                '<head>\n' \
                '<title>Listing of %s</title>\n' % cgi.escape(label)
            if self._listings_css:
                body += '  <link rel="stylesheet" type="text/css" ' \
                    'href="%s" />\n' % self._build_css_path(prefix or '')
            else:
                body += '  <style type="text/css">\n' \
                    '   h1 {font-size: 1em; font-weight: bold;}\n' \
                    '   p {font-size: 2}\n' \
                    '  </style>\n'
            body += '</head>\n<body>' \
                '  <h1>Web Listing Disabled</h1>' \
                '   <p>The owner of this web site has disabled web listing.' \
                '   <p>If you are the owner of this web site, you can enable' \
                '   web listing by setting X-Container-Meta-Web-Listings.</p>'
            if self._index:
                body += '<h1>Index File Not Found</h1>' \
                    ' <p>The owner of this web site has set ' \
                    ' <b>X-Container-Meta-Web-Index: %s</b>. ' \
                    ' However, this file is not found.</p>' % self._index
            body += ' </body>\n</html>\n'
            resp = HTTPNotFound(body=body)(env, self._start_response)
            return self._error_response(resp, env, start_response)
        tmp_env = make_env(
            env, 'GET', '/%s/%s/%s' % (
                self.version, self.account, self.container),
            self.agent, swift_source='SW')
        tmp_env['QUERY_STRING'] = 'delimiter=/&format=json'
        if prefix:
            tmp_env['QUERY_STRING'] += '&prefix=%s' % quote(prefix)
        else:
            prefix = ''
        resp = self._app_call(tmp_env)
        if not is_success(self._get_status_int()):
            return self._error_response(resp, env, start_response)
        listing = None
        body = ''.join(resp)
        if body:
            listing = json.loads(body)
        if not listing:
            resp = HTTPNotFound()(env, self._start_response)
            return self._error_response(resp, env, start_response)
        headers = {'Content-Type': 'text/html; charset=UTF-8'}
        body = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 ' \
               'Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">\n' \
               '<html>\n' \
               ' <head>\n' \
               '  <title>Listing of %s</title>\n' % cgi.escape(label)
        if self._listings_css:
            body += '  <link rel="stylesheet" type="text/css" ' \
                    'href="%s" />\n' % (self._build_css_path(prefix))
        else:
            body += '  <style type="text/css">\n' \
                    '   h1 {font-size: 1em; font-weight: bold;}\n' \
                    '   th {text-align: left; padding: 0px 1em 0px 1em;}\n' \
                    '   td {padding: 0px 1em 0px 1em;}\n' \
                    '   a {text-decoration: none;}\n' \
                    '  </style>\n'
        body += ' </head>\n' \
                ' <body>\n' \
                '  <h1 id="title">Listing of %s</h1>\n' \
                '  <table id="listing">\n' \
                '   <tr id="heading">\n' \
                '    <th class="colname">Name</th>\n' \
                '    <th class="colsize">Size</th>\n' \
                '    <th class="coldate">Date</th>\n' \
                '   </tr>\n' % cgi.escape(label)
        if prefix:
            body += '   <tr id="parent" class="item">\n' \
                    '    <td class="colname"><a href="../">../</a></td>\n' \
                    '    <td class="colsize">&nbsp;</td>\n' \
                    '    <td class="coldate">&nbsp;</td>\n' \
                    '   </tr>\n'
        for item in listing:
            if 'subdir' in item:
                subdir = item['subdir'].encode("utf-8")
                if prefix:
                    subdir = subdir[len(prefix):]
                body += '   <tr class="item subdir">\n' \
                        '    <td class="colname"><a href="%s">%s</a></td>\n' \
                        '    <td class="colsize">&nbsp;</td>\n' \
                        '    <td class="coldate">&nbsp;</td>\n' \
                        '   </tr>\n' % \
                        (quote(subdir), cgi.escape(subdir))
        for item in listing:
            if 'name' in item:
                name = item['name'].encode("utf-8")
                if prefix:
                    name = name[len(prefix):]
                content_type = item['content_type'].encode("utf-8")
                bytes = human_readable(item['bytes'])
                last_modified = (
                    cgi.escape(item['last_modified'].encode("utf-8")).
                    split('.')[0].replace('T', ' '))
                body += '   <tr class="item %s">\n' \
                        '    <td class="colname"><a href="%s">%s</a></td>\n' \
                        '    <td class="colsize">%s</td>\n' \
                        '    <td class="coldate">%s</td>\n' \
                        '   </tr>\n' % \
                        (' '.join('type-' + cgi.escape(t.lower(), quote=True)
                                  for t in content_type.split('/')),
                         quote(name), cgi.escape(name),
                         bytes, last_modified)
        body += '  </table>\n' \
                ' </body>\n' \
                '</html>\n'
        resp = Response(headers=headers, body=body)
        return resp(env, start_response)
dataset/ETHPy150Open openstack/swift/swift/common/middleware/staticweb.py/_StaticWebContext._listing/original