def report():
    """Return a string with a summary report of test-related variables."""
    inf = get_sys_info()
    out = []
    def _add(name, value):
        out.append((name, value))

    _add('Python version', inf['sys_version'].replace('\n',''))
    _add('sys.executable', inf['sys_executable'])
    _add('Platform', inf['platform'])

    width = max(len(n) for (n,v) in out)
    out = ["{:<{width}}: {}\n".format(n, v, width=width) for (n,v) in out]

    avail = []
    not_avail = []

    for k, is_avail in have.items():
        if is_avail:
            avail.append(k)
        else:
            not_avail.append(k)

    if avail:
        out.append('\nTools and libraries available at test time:\n')
        avail.sort()
        out.append('   ' + ' '.join(avail)+'\n')

    if not_avail:
        out.append('\nTools and libraries NOT available at test time:\n')
        not_avail.sort()
        out.append('   ' + ' '.join(not_avail)+'\n')

    return ''.join(out)

    def init_settings(self, ipython_app, kernel_manager, contents_manager,
                      session_manager, kernel_spec_manager,
                      config_manager,
                      log, base_url, default_url, settings_overrides,
                      jinja_env_options=None):

        _template_path = settings_overrides.get(
            "template_path",
            ipython_app.template_file_path,
        )
        if isinstance(_template_path, py3compat.string_types):
            _template_path = (_template_path,)
        template_path = [os.path.expanduser(path) for path in _template_path]

        jenv_opt = {"autoescape": True}
        jenv_opt.update(jinja_env_options if jinja_env_options else {})

        env = Environment(loader=FileSystemLoader(template_path), **jenv_opt)
        
        sys_info = get_sys_info()
        if sys_info['commit_source'] == 'repository':
            # don't cache (rely on 304) when working from master
            version_hash = ''
        else:
            # reset the cache on server restart
            version_hash = datetime.datetime.now().strftime("%Y%m%d%H%M%S")

        if ipython_app.ignore_minified_js:
            log.warn("""The `ignore_minified_js` flag is deprecated and no 
                longer works.  Alternatively use `npm run build:watch` when
                working on the notebook's Javascript and LESS""")
            warnings.warn("The `ignore_minified_js` flag is deprecated and will be removed in Notebook 6.0", DeprecationWarning)

        settings = dict(
            # basics
            log_function=log_request,
            base_url=base_url,
            default_url=default_url,
            template_path=template_path,
            static_path=ipython_app.static_file_path,
            static_custom_path=ipython_app.static_custom_path,
            static_handler_class = FileFindHandler,
            static_url_prefix = url_path_join(base_url,'/static/'),
            static_handler_args = {
                # don't cache custom.js
                'no_cache_paths': [url_path_join(base_url, 'static', 'custom')],
            },
            version_hash=version_hash,
            ignore_minified_js=ipython_app.ignore_minified_js,
            
            # rate limits
            iopub_msg_rate_limit=ipython_app.iopub_msg_rate_limit,
            iopub_data_rate_limit=ipython_app.iopub_data_rate_limit,
            rate_limit_window=ipython_app.rate_limit_window,
            
            # authentication
            cookie_secret=ipython_app.cookie_secret,
            login_url=url_path_join(base_url,'/login'),
            login_handler_class=ipython_app.login_handler_class,
            logout_handler_class=ipython_app.logout_handler_class,
            password=ipython_app.password,

            # managers
            kernel_manager=kernel_manager,
            contents_manager=contents_manager,
            session_manager=session_manager,
            kernel_spec_manager=kernel_spec_manager,
            config_manager=config_manager,

            # IPython stuff
            jinja_template_vars=ipython_app.jinja_template_vars,
            nbextensions_path=ipython_app.nbextensions_path,
            websocket_url=ipython_app.websocket_url,
            mathjax_url=ipython_app.mathjax_url,
            mathjax_config=ipython_app.mathjax_config,
            config=ipython_app.config,
            config_dir=ipython_app.config_dir,
            jinja2_env=env,
            terminals_available=False,  # Set later if terminals are available
        )

        # allow custom overrides for the tornado web app.
        settings.update(settings_overrides)
        return settings

from notebook._sysinfo import get_sys_info

from traitlets.config import Application
from ipython_genutils.path import filefind
from ipython_genutils.py3compat import string_types

import notebook
from notebook.utils import is_hidden, url_path_join, url_is_absolute, url_escape
from notebook.services.security import csp_report_uri

#-----------------------------------------------------------------------------
# Top-level handlers
#-----------------------------------------------------------------------------
non_alphanum = re.compile(r'[^A-Za-z0-9]')

sys_info = json.dumps(get_sys_info())

class AuthenticatedHandler(web.RequestHandler):
    """A RequestHandler with an authenticated user."""
    
    @property
    def content_security_policy(self):
        """The default Content-Security-Policy header
        
        Can be overridden by defining Content-Security-Policy in settings['headers']
        """
        return '; '.join([
            "frame-ancestors 'self'",
            # Make sure the report-uri is relative to the base_url
            "report-uri " + url_path_join(self.base_url, csp_report_uri),
        ])

def json_sys_info():
    global _sys_info_cache
    if _sys_info_cache is None:
        _sys_info_cache = json.dumps(get_sys_info())
    return _sys_info_cache

    def init_settings(self, ipython_app, kernel_manager, contents_manager,
                      cluster_manager, session_manager, kernel_spec_manager,
                      config_manager,
                      log, base_url, default_url, settings_overrides,
                      jinja_env_options=None):

        _template_path = settings_overrides.get(
            "template_path",
            ipython_app.template_file_path,
        )
        if isinstance(_template_path, str):
            _template_path = (_template_path,)
        template_path = [os.path.expanduser(path) for path in _template_path]

        jenv_opt = jinja_env_options if jinja_env_options else {}
        env = Environment(loader=FileSystemLoader(template_path), **jenv_opt)
        
        sys_info = get_sys_info()
        if sys_info['commit_source'] == 'repository':
            # don't cache (rely on 304) when working from master
            version_hash = ''
        else:
            # reset the cache on server restart
            version_hash = datetime.datetime.now().strftime("%Y%m%d%H%M%S")

        settings = dict(
            # basics
            log_function=log_request,
            base_url=base_url,
            default_url=default_url,
            template_path=template_path,
            static_path=ipython_app.static_file_path,
            static_custom_path=ipython_app.static_custom_path,
            static_handler_class = FileFindHandler,
            static_url_prefix = url_path_join(base_url,'/static/'),
            static_handler_args = {
                # don't cache custom.js
                'no_cache_paths': [url_path_join(base_url, 'static', 'custom')],
            },
            version_hash=version_hash,
            
            # authentication
            cookie_secret=ipython_app.cookie_secret,
            login_url=url_path_join(base_url,'/login'),
            login_handler_class=ipython_app.login_handler_class,
            logout_handler_class=ipython_app.logout_handler_class,
            password=ipython_app.password,

            # managers
            kernel_manager=kernel_manager,
            contents_manager=contents_manager,
            cluster_manager=cluster_manager,
            session_manager=session_manager,
            kernel_spec_manager=kernel_spec_manager,
            config_manager=config_manager,

            # IPython stuff
            jinja_template_vars=ipython_app.jinja_template_vars,
            nbextensions_path=ipython_app.nbextensions_path,
            websocket_url=ipython_app.websocket_url,
            mathjax_url=ipython_app.mathjax_url,
            config=ipython_app.config,
            jinja2_env=env,
            terminals_available=False,  # Set later if terminals are available
        )

        # allow custom overrides for the tornado web app.
        settings.update(settings_overrides)
        return settings