def add_settings(request):
    realm = request.user.realm if hasattr(request.user, "realm") else None
    return {
        # We use the not_voyager variable name so that templates
        # will render even if the appropriate context is not provided
        # to the template
        'not_voyager':               not settings.VOYAGER,
        'zulip_com':                 settings.ZULIP_COM,
        'custom_logo_url':           settings.CUSTOM_LOGO_URL,
        'register_link_disabled':    settings.REGISTER_LINK_DISABLED,
        'show_oss_announcement':     settings.SHOW_OSS_ANNOUNCEMENT,
        'zulip_admin':               settings.ZULIP_ADMINISTRATOR,
        'login_url':                 settings.HOME_NOT_LOGGED_IN,
        'only_sso':                  settings.ONLY_SSO,
        'external_api_path':         settings.EXTERNAL_API_PATH,
        'external_api_uri':          settings.EXTERNAL_API_URI,
        'external_uri_scheme':       settings.EXTERNAL_URI_SCHEME,
        'api_site_required':         settings.EXTERNAL_API_PATH != "api.zulip.com",
        'email_integration_enabled': settings.EMAIL_GATEWAY_BOT != "",
        'email_gateway_example':     settings.EMAIL_GATEWAY_EXAMPLE,
        'open_realm_creation':       settings.OPEN_REALM_CREATION,
        'password_auth_enabled':     password_auth_enabled(realm),
        'dev_auth_enabled':          dev_auth_enabled(),
        'google_auth_enabled':       google_auth_enabled(),
        'development_environment':   settings.DEVELOPMENT,
    }

def json_fetch_api_key(request, user_profile, password=REQ(default='')):
    # type: (HttpRequest, UserProfile, str) -> HttpResponse
    if password_auth_enabled(user_profile.realm):
        if not authenticate(username=user_profile.email, password=password,
                            realm_subdomain=get_subdomain(request)):
            return json_error(_("Your username or password is incorrect."))
    return json_success({"api_key": user_profile.api_key})

def add_settings(request):
    # type: (HttpRequest) -> Dict[str, Any]
    if hasattr(request.user, "realm"):
        realm = request.user.realm
        realm_uri = realm.uri
    else:
        realm = None
        # TODO: Figure out how to add an assertion that this is not used
        realm_uri = settings.SERVER_URI

    return {
        'custom_logo_url':           settings.CUSTOM_LOGO_URL,
        'register_link_disabled':    settings.REGISTER_LINK_DISABLED,
        'show_oss_announcement':     settings.SHOW_OSS_ANNOUNCEMENT,
        'zulip_admin':               settings.ZULIP_ADMINISTRATOR,
        'terms_of_service':          settings.TERMS_OF_SERVICE,
        'login_url':                 settings.HOME_NOT_LOGGED_IN,
        'only_sso':                  settings.ONLY_SSO,
        'external_api_path':         settings.EXTERNAL_API_PATH,
        'external_api_uri':          settings.EXTERNAL_API_URI,
        'external_host':             settings.EXTERNAL_HOST,
        'external_uri_scheme':       settings.EXTERNAL_URI_SCHEME,
        'realm_uri':                 realm_uri,
        'server_uri':                settings.SERVER_URI,
        'api_site_required':         settings.EXTERNAL_API_PATH != "api.zulip.com",
        'email_integration_enabled': settings.EMAIL_GATEWAY_BOT != "",
        'email_gateway_example':     settings.EMAIL_GATEWAY_EXAMPLE,
        'open_realm_creation':       settings.OPEN_REALM_CREATION,
        'password_auth_enabled':     password_auth_enabled(realm),
        'dev_auth_enabled':          dev_auth_enabled(),
        'google_auth_enabled':       google_auth_enabled(),
        'github_auth_enabled':       github_auth_enabled(),
        'development_environment':   settings.DEVELOPMENT,
        'support_email':             settings.ZULIP_ADMINISTRATOR,
    }

def get_auth_backends_data(request: HttpRequest) -> Dict[str, Any]:
    """Returns which authentication methods are enabled on the server"""
    subdomain = get_subdomain(request)
    try:
        realm = Realm.objects.get(string_id=subdomain)
    except Realm.DoesNotExist:
        # If not the root subdomain, this is an error
        if subdomain != Realm.SUBDOMAIN_FOR_ROOT_DOMAIN:
            raise JsonableError(_("Invalid subdomain"))
        # With the root subdomain, it's an error or not depending
        # whether ROOT_DOMAIN_LANDING_PAGE (which indicates whether
        # there are some realms without subdomains on this server)
        # is set.
        if settings.ROOT_DOMAIN_LANDING_PAGE:
            raise JsonableError(_("Subdomain required"))
        else:
            realm = None
    return {
        "password": password_auth_enabled(realm),
        "dev": dev_auth_enabled(realm),
        "email": email_auth_enabled(realm),
        "github": github_auth_enabled(realm),
        "google": google_auth_enabled(realm),
        "ldap": ldap_auth_enabled(realm),
    }

def get_auth_backends_data(request):
    # type: (HttpRequest) -> Dict[str, Any]
    """Returns which authentication methods are enabled on the server"""
    if settings.REALMS_HAVE_SUBDOMAINS:
        subdomain = get_subdomain(request)
        try:
            realm = Realm.objects.get(string_id=subdomain)
        except Realm.DoesNotExist:
            # If not the root subdomain, this is an error
            if subdomain != "":
                raise JsonableError(_("Invalid subdomain"))
            # With the root subdomain, it's an error or not depending
            # whether SUBDOMAINS_HOMEPAGE (which indicates whether
            # there are some realms without subdomains on this server)
            # is set.
            if settings.SUBDOMAINS_HOMEPAGE:
                raise JsonableError(_("Subdomain required"))
            else:
                realm = None
    else:
        # Without subdomains, we just have to report what the server
        # supports, since we don't know the realm.
        realm = None
    return {"password": password_auth_enabled(realm),
            "dev": dev_auth_enabled(realm),
            "github": github_auth_enabled(realm),
            "google": google_auth_enabled(realm)}

def api_get_auth_backends(request):
    # type: (HttpRequest) -> HttpResponse
    # May return a false positive for password auth if it's been disabled
    # for a specific realm. Currently only happens for zulip.com on prod
    return json_success({"password": password_auth_enabled(None),
                         "dev": dev_auth_enabled(),
                         "google": google_auth_enabled(),
                         })

def json_fetch_api_key(request: HttpRequest, user_profile: UserProfile,
                       password: str=REQ(default='')) -> HttpResponse:
    subdomain = get_subdomain(request)
    realm = get_realm(subdomain)
    if password_auth_enabled(user_profile.realm):
        if not authenticate(username=user_profile.email, password=password,
                            realm=realm):
            return json_error(_("Your username or password is incorrect."))

    api_key = get_api_key(user_profile)
    return json_success({"api_key": api_key})

def add_settings(request):
    # type: (HttpRequest) -> Dict[str, Any]
    realm = None
    if hasattr(request.user, "realm"):
        realm = request.user.realm
    elif settings.REALMS_HAVE_SUBDOMAINS:
        subdomain = get_subdomain(request)
        realm = get_realm(subdomain)

    if realm is not None:
        realm_uri = realm.uri
    else:
        realm_uri = settings.SERVER_URI

    return {
        'custom_logo_url': settings.CUSTOM_LOGO_URL,
        'register_link_disabled': settings.REGISTER_LINK_DISABLED,
        'login_link_disabled': settings.LOGIN_LINK_DISABLED,
        'about_link_disabled': settings.ABOUT_LINK_DISABLED,
        'show_oss_announcement': settings.SHOW_OSS_ANNOUNCEMENT,
        'zulip_admin': settings.ZULIP_ADMINISTRATOR,
        'terms_of_service': settings.TERMS_OF_SERVICE,
        'login_url': settings.HOME_NOT_LOGGED_IN,
        'only_sso': settings.ONLY_SSO,
        'external_api_path': settings.EXTERNAL_API_PATH,
        'external_api_uri': settings.EXTERNAL_API_URI,
        'external_host': settings.EXTERNAL_HOST,
        'external_uri_scheme': settings.EXTERNAL_URI_SCHEME,
        'realm_uri': realm_uri,
        'server_uri': settings.SERVER_URI,
        'api_site_required': settings.EXTERNAL_API_PATH != "api.zulip.com",
        'email_integration_enabled': settings.EMAIL_GATEWAY_BOT != "",
        'email_gateway_example': settings.EMAIL_GATEWAY_EXAMPLE,
        'open_realm_creation': settings.OPEN_REALM_CREATION,
        'password_auth_enabled': password_auth_enabled(realm),
        'dev_auth_enabled': dev_auth_enabled(realm),
        'google_auth_enabled': google_auth_enabled(realm),
        'github_auth_enabled': github_auth_enabled(realm),
        'development_environment': settings.DEVELOPMENT,
        'support_email': settings.ZULIP_ADMINISTRATOR,
        'find_team_link_disabled': settings.FIND_TEAM_LINK_DISABLED,
        'password_min_length': settings.PASSWORD_MIN_LENGTH,
        'password_min_quality': settings.PASSWORD_MIN_ZXCVBN_QUALITY,
        'zulip_version': ZULIP_VERSION,
    }

def add_settings(request):
    realm = request.user.realm if hasattr(request.user, "realm") else None
    return {
        # We use the not_voyager variable name so that templates
        # will render even if the appropriate context is not provided
        # to the template
        'not_voyager':               not settings.VOYAGER,
        'zulip_com':                 settings.ZULIP_COM,
        'zulip_admin':               settings.ZULIP_ADMINISTRATOR,
        'login_url':                 settings.HOME_NOT_LOGGED_IN,
        'only_sso':                  settings.ONLY_SSO,
        'external_api_path':         settings.EXTERNAL_API_PATH,
        'external_api_uri':          settings.EXTERNAL_API_URI,
        'external_uri_scheme':       settings.EXTERNAL_URI_SCHEME,
        'api_site_required':         settings.EXTERNAL_API_PATH != "api.zulip.com",
        'email_integration_enabled': settings.EMAIL_GATEWAY_BOT != "",
        'email_gateway_example':     settings.EMAIL_GATEWAY_EXAMPLE,
        'password_auth_enabled':     password_auth_enabled(realm),
        'dev_auth_enabled':          dev_auth_enabled(),
        'google_auth_enabled':       google_auth_enabled(),
    }

def get_auth_backends_data(request: HttpRequest) -> Dict[str, Any]:
    """Returns which authentication methods are enabled on the server"""
    subdomain = get_subdomain(request)
    try:
        realm = Realm.objects.get(string_id=subdomain)
    except Realm.DoesNotExist:
        # If not the root subdomain, this is an error
        if subdomain != Realm.SUBDOMAIN_FOR_ROOT_DOMAIN:
            raise JsonableError(_("Invalid subdomain"))
        # With the root subdomain, it's an error or not depending
        # whether ROOT_DOMAIN_LANDING_PAGE (which indicates whether
        # there are some realms without subdomains on this server)
        # is set.
        if settings.ROOT_DOMAIN_LANDING_PAGE:
            raise JsonableError(_("Subdomain required"))
        else:
            realm = None
    result = {
        "password": password_auth_enabled(realm),
    }
    for auth_backend_name in AUTH_BACKEND_NAME_MAP:
        key = auth_backend_name.lower()
        result[key] = auth_enabled_helper([auth_backend_name], realm)
    return result

def zulip_default_context(request: HttpRequest) -> Dict[str, Any]:
    """Context available to all Zulip Jinja2 templates that have a request
    passed in.  Designed to provide the long list of variables at the
    bottom of this function in a wide range of situations: logged-in
    or logged-out, subdomains or not, etc.

    The main variable in the below is whether we know what realm the
    user is trying to interact with.
    """
    realm = get_realm_from_request(request)

    if realm is None:
        realm_uri = settings.ROOT_DOMAIN_URI
        realm_name = None
        realm_icon = None
        realm_description = None
        realm_invite_required = False
    else:
        realm_uri = realm.uri
        realm_name = realm.name
        realm_icon = get_realm_icon_url(realm)
        realm_description_raw = realm.description or "The coolest place in the universe."
        realm_description = convert(realm_description_raw, message_realm=realm)
        realm_invite_required = realm.invite_required

    register_link_disabled = settings.REGISTER_LINK_DISABLED
    login_link_disabled = settings.LOGIN_LINK_DISABLED
    find_team_link_disabled = settings.FIND_TEAM_LINK_DISABLED
    allow_search_engine_indexing = False

    if (settings.ROOT_DOMAIN_LANDING_PAGE
            and get_subdomain(request) == Realm.SUBDOMAIN_FOR_ROOT_DOMAIN):
        register_link_disabled = True
        login_link_disabled = True
        find_team_link_disabled = False
        allow_search_engine_indexing = True

    apps_page_url = 'https://zulipchat.com/apps/'
    if settings.ZILENCER_ENABLED:
        apps_page_url = '/apps/'

    user_is_authenticated = False
    if hasattr(request, 'user') and hasattr(request.user, 'is_authenticated'):
        user_is_authenticated = request.user.is_authenticated.value

    if settings.DEVELOPMENT:
        secrets_path = "zproject/dev-secrets.conf"
        settings_path = "zproject/dev_settings.py"
        settings_comments_path = "zproject/prod_settings_template.py"
    else:
        secrets_path = "/etc/zulip/zulip-secrets.conf"
        settings_path = "/etc/zulip/settings.py"
        settings_comments_path = "/etc/zulip/settings.py"

    if hasattr(request, "client") and request.client.name == "ZulipElectron":
        platform = "ZulipElectron"  # nocoverage
    else:
        platform = "ZulipWeb"

    return {
        'root_domain_landing_page': settings.ROOT_DOMAIN_LANDING_PAGE,
        'custom_logo_url': settings.CUSTOM_LOGO_URL,
        'register_link_disabled': register_link_disabled,
        'login_link_disabled': login_link_disabled,
        'terms_of_service': settings.TERMS_OF_SERVICE,
        'privacy_policy': settings.PRIVACY_POLICY,
        'login_url': settings.HOME_NOT_LOGGED_IN,
        'only_sso': settings.ONLY_SSO,
        'custom_profile_fields_enabled': settings.DEVELOPMENT,
        'external_host': settings.EXTERNAL_HOST,
        'external_uri_scheme': settings.EXTERNAL_URI_SCHEME,
        'realm_invite_required': realm_invite_required,
        'realm_uri': realm_uri,
        'realm_name': realm_name,
        'realm_icon': realm_icon,
        'realm_description': realm_description,
        'root_domain_uri': settings.ROOT_DOMAIN_URI,
        'apps_page_url': apps_page_url,
        'open_realm_creation': settings.OPEN_REALM_CREATION,
        'password_auth_enabled': password_auth_enabled(realm),
        'dev_auth_enabled': dev_auth_enabled(realm),
        'google_auth_enabled': google_auth_enabled(realm),
        'github_auth_enabled': github_auth_enabled(realm),
        'email_auth_enabled': email_auth_enabled(realm),
        'require_email_format_usernames': require_email_format_usernames(realm),
        'any_oauth_backend_enabled': any_oauth_backend_enabled(realm),
        'no_auth_enabled': not auth_enabled_helper(list(AUTH_BACKEND_NAME_MAP.keys()), realm),
        'development_environment': settings.DEVELOPMENT,
        'support_email': FromAddress.SUPPORT,
        'find_team_link_disabled': find_team_link_disabled,
        'password_min_length': settings.PASSWORD_MIN_LENGTH,
        'password_min_guesses': settings.PASSWORD_MIN_GUESSES,
        'jitsi_server_url': settings.JITSI_SERVER_URL,
        'two_factor_authentication_enabled': settings.TWO_FACTOR_AUTHENTICATION_ENABLED,
        'zulip_version': ZULIP_VERSION,
        'user_is_authenticated': user_is_authenticated,
        'settings_path': settings_path,
        'secrets_path': secrets_path,
        'settings_comments_path': settings_comments_path,
        'platform': platform,
#.........这里部分代码省略.........

def fetch_initial_state_data(user_profile: UserProfile,
                             event_types: Optional[Iterable[str]],
                             queue_id: str, client_gravatar: bool,
                             include_subscribers: bool = True) -> Dict[str, Any]:
    state = {'queue_id': queue_id}  # type: Dict[str, Any]
    realm = user_profile.realm

    if event_types is None:
        # return True always
        want = always_want  # type: Callable[[str], bool]
    else:
        want = set(event_types).__contains__

    if want('alert_words'):
        state['alert_words'] = user_alert_words(user_profile)

    if want('custom_profile_fields'):
        fields = custom_profile_fields_for_realm(realm.id)
        state['custom_profile_fields'] = [f.as_dict() for f in fields]
        state['custom_profile_field_types'] = CustomProfileField.FIELD_TYPE_CHOICES_DICT

    if want('hotspots'):
        state['hotspots'] = get_next_hotspots(user_profile)

    if want('message'):
        # The client should use get_messages() to fetch messages
        # starting with the max_message_id.  They will get messages
        # newer than that ID via get_events()
        messages = Message.objects.filter(usermessage__user_profile=user_profile).order_by('-id')[:1]
        if messages:
            state['max_message_id'] = messages[0].id
        else:
            state['max_message_id'] = -1

    if want('muted_topics'):
        state['muted_topics'] = get_topic_mutes(user_profile)

    if want('pointer'):
        state['pointer'] = user_profile.pointer

    if want('presence'):
        state['presences'] = get_status_dict(user_profile)

    if want('realm'):
        for property_name in Realm.property_types:
            state['realm_' + property_name] = getattr(realm, property_name)

        # Most state is handled via the property_types framework;
        # these manual entries are for those realm settings that don't
        # fit into that framework.
        state['realm_authentication_methods'] = realm.authentication_methods_dict()
        state['realm_allow_message_editing'] = realm.allow_message_editing
        state['realm_allow_community_topic_editing'] = realm.allow_community_topic_editing
        state['realm_allow_message_deleting'] = realm.allow_message_deleting
        state['realm_message_content_edit_limit_seconds'] = realm.message_content_edit_limit_seconds
        state['realm_message_content_delete_limit_seconds'] = realm.message_content_delete_limit_seconds
        state['realm_icon_url'] = realm_icon_url(realm)
        state['realm_icon_source'] = realm.icon_source
        state['max_icon_file_size'] = settings.MAX_ICON_FILE_SIZE
        state['realm_logo_url'] = realm_logo_url(realm)
        state['realm_logo_source'] = realm.logo_source
        state['max_logo_file_size'] = settings.MAX_LOGO_FILE_SIZE
        state['realm_bot_domain'] = realm.get_bot_domain()
        state['realm_uri'] = realm.uri
        state['realm_available_video_chat_providers'] = realm.VIDEO_CHAT_PROVIDERS
        state['realm_presence_disabled'] = realm.presence_disabled
        state['realm_digest_emails_enabled'] = realm.digest_emails_enabled and settings.SEND_DIGEST_EMAILS
        state['realm_is_zephyr_mirror_realm'] = realm.is_zephyr_mirror_realm
        state['realm_email_auth_enabled'] = email_auth_enabled(realm)
        state['realm_password_auth_enabled'] = password_auth_enabled(realm)
        state['realm_push_notifications_enabled'] = push_notifications_enabled()
        if realm.notifications_stream and not realm.notifications_stream.deactivated:
            notifications_stream = realm.notifications_stream
            state['realm_notifications_stream_id'] = notifications_stream.id
        else:
            state['realm_notifications_stream_id'] = -1

        signup_notifications_stream = realm.get_signup_notifications_stream()
        if signup_notifications_stream:
            state['realm_signup_notifications_stream_id'] = signup_notifications_stream.id
        else:
            state['realm_signup_notifications_stream_id'] = -1

    if want('realm_domains'):
        state['realm_domains'] = get_realm_domains(realm)

    if want('realm_emoji'):
        state['realm_emoji'] = realm.get_emoji()

    if want('realm_filters'):
        state['realm_filters'] = realm_filters_for_realm(realm.id)

    if want('realm_user_groups'):
        state['realm_user_groups'] = user_groups_in_realm_serialized(realm)

    if want('realm_user'):
        state['raw_users'] = get_raw_user_data(
            realm_id=realm.id,
            client_gravatar=client_gravatar,
        )
#.........这里部分代码省略.........

#.........这里部分代码省略.........
                        # We don't use initial= here, because if the form is
                        # complete (that is, no additional fields need to be
                        # filled out by the user) we want the form to validate,
                        # so they can be directly registered without having to
                        # go through this interstitial.
                        form = RegistrationForm({'full_name': ldap_full_name},
                                                realm_creation=realm_creation)
                        # FIXME: This will result in the user getting
                        # validation errors if they have to enter a password.
                        # Not relevant for ONLY_SSO, though.
                        break
                    except TypeError:
                        # Let the user fill out a name and/or try another backend
                        form = RegistrationForm(realm_creation=realm_creation)
        elif 'full_name' in request.POST:
            form = RegistrationForm(
                initial={'full_name': request.POST.get('full_name')},
                realm_creation=realm_creation
            )
        else:
            form = RegistrationForm(realm_creation=realm_creation)
    else:
        postdata = request.POST.copy()
        if name_changes_disabled(realm):
            # If we populate profile information via LDAP and we have a
            # verified name from you on file, use that. Otherwise, fall
            # back to the full name in the request.
            try:
                postdata.update({'full_name': request.session['authenticated_full_name']})
                name_validated = True
            except KeyError:
                pass
        form = RegistrationForm(postdata, realm_creation=realm_creation)
        if not (password_auth_enabled(realm) and password_required):
            form['password'].field.required = False

    if form.is_valid():
        if password_auth_enabled(realm):
            password = form.cleaned_data['password']
        else:
            # SSO users don't need no passwords
            password = None

        if realm_creation:
            string_id = form.cleaned_data['realm_subdomain']
            realm_name = form.cleaned_data['realm_name']
            realm = do_create_realm(string_id, realm_name)
            setup_initial_streams(realm)
            setup_realm_internal_bots(realm)
        assert(realm is not None)

        full_name = form.cleaned_data['full_name']
        short_name = email_to_username(email)
        default_stream_group_names = request.POST.getlist('default_stream_group')
        default_stream_groups = lookup_default_stream_groups(default_stream_group_names, realm)

        timezone = ""
        if 'timezone' in request.POST and request.POST['timezone'] in get_all_timezones():
            timezone = request.POST['timezone']

        if 'source_realm' in request.POST and request.POST["source_realm"] != "on":
            source_profile = get_source_profile(email, request.POST["source_realm"])
        else:
            source_profile = None

        if not realm_creation:

#.........这里部分代码省略.........
                        request.session['authenticated_full_name'] = ldap_full_name
                        name_validated = True
                        # We don't use initial= here, because if the form is
                        # complete (that is, no additional fields need to be
                        # filled out by the user) we want the form to validate,
                        # so they can be directly registered without having to
                        # go through this interstitial.
                        form = RegistrationForm({'full_name': ldap_full_name})
                        # FIXME: This will result in the user getting
                        # validation errors if they have to enter a password.
                        # Not relevant for ONLY_SSO, though.
                        break
                    except TypeError:
                        # Let the user fill out a name and/or try another backend
                        form = RegistrationForm()
        elif 'full_name' in request.POST:
            form = RegistrationForm(
                initial={'full_name': request.POST.get('full_name')}
            )
        else:
            form = RegistrationForm()
    else:
        postdata = request.POST.copy()
        if name_changes_disabled(realm):
            # If we populate profile information via LDAP and we have a
            # verified name from you on file, use that. Otherwise, fall
            # back to the full name in the request.
            try:
                postdata.update({'full_name': request.session['authenticated_full_name']})
                name_validated = True
            except KeyError:
                pass
        form = RegistrationForm(postdata)
        if not password_auth_enabled(realm):
            form['password'].field.required = False

    if form.is_valid():
        if password_auth_enabled(realm):
            password = form.cleaned_data['password']
        else:
            # SSO users don't need no passwords
            password = None

        if realm_creation:
            string_id = form.cleaned_data['realm_subdomain']
            realm_name = form.cleaned_data['realm_name']
            org_type = int(form.cleaned_data['realm_org_type'])
            domain = split_email_to_domain(email)
            realm = do_create_realm(string_id, realm_name, org_type=org_type,
                                    domain=domain)[0]

            set_default_streams(realm, settings.DEFAULT_NEW_REALM_STREAMS)

        full_name = form.cleaned_data['full_name']
        short_name = email_to_username(email)
        first_in_realm = len(UserProfile.objects.filter(realm=realm, is_bot=False)) == 0

        # FIXME: sanitize email addresses and fullname
        if existing_user_profile is not None and existing_user_profile.is_mirror_dummy:
            try:
                user_profile = existing_user_profile
                do_activate_user(user_profile)
                do_change_password(user_profile, password)
                do_change_full_name(user_profile, full_name)
            except UserProfile.DoesNotExist:
                user_profile = do_create_user(email, password, realm, full_name, short_name,

#.........这里部分代码省略.........
            latest_read = None

    desktop_notifications_enabled = user_profile.enable_desktop_notifications
    if narrow_stream is not None:
        desktop_notifications_enabled = False

    if user_profile.realm.notifications_stream:
        notifications_stream = user_profile.realm.notifications_stream.name
    else:
        notifications_stream = ""

    # Set default language and make it persist
    default_language = register_ret['default_language']
    url_lang = '/{}'.format(request.LANGUAGE_CODE)
    if not request.path.startswith(url_lang):
        translation.activate(default_language)

    request.session[translation.LANGUAGE_SESSION_KEY] = default_language

    # Pass parameters to the client-side JavaScript code.
    # These end up in a global JavaScript Object named 'page_params'.
    page_params = dict(
        zulip_version         = ZULIP_VERSION,
        share_the_love        = settings.SHARE_THE_LOVE,
        development_environment = settings.DEVELOPMENT,
        debug_mode            = settings.DEBUG,
        test_suite            = settings.TEST_SUITE,
        poll_timeout          = settings.POLL_TIMEOUT,
        login_page            = settings.HOME_NOT_LOGGED_IN,
        server_uri            = settings.SERVER_URI,
        realm_uri             = user_profile.realm.uri,
        maxfilesize           = settings.MAX_FILE_UPLOAD_SIZE,
        server_generation     = settings.SERVER_GENERATION,
        password_auth_enabled = password_auth_enabled(user_profile.realm),
        have_initial_messages = user_has_messages,
        subbed_info           = register_ret['subscriptions'],
        unsubbed_info         = register_ret['unsubscribed'],
        neversubbed_info      = register_ret['never_subscribed'],
        email_dict            = register_ret['email_dict'],
        people_list           = register_ret['realm_users'],
        bot_list              = register_ret['realm_bots'],
        initial_pointer       = register_ret['pointer'],
        initial_presences     = register_ret['presences'],
        initial_servertime    = time.time(), # Used for calculating relative presence age
        fullname              = user_profile.full_name,
        email                 = user_profile.email,
        domain                = user_profile.realm.domain,
        domains               = list_of_domains_for_realm(user_profile.realm),
        realm_name            = register_ret['realm_name'],
        realm_invite_required = register_ret['realm_invite_required'],
        realm_invite_by_admins_only = register_ret['realm_invite_by_admins_only'],
        realm_create_stream_by_admins_only = register_ret['realm_create_stream_by_admins_only'],
        realm_allow_message_editing = register_ret['realm_allow_message_editing'],
        realm_message_content_edit_limit_seconds = register_ret['realm_message_content_edit_limit_seconds'],
        realm_restricted_to_domain = register_ret['realm_restricted_to_domain'],
        realm_default_language = register_ret['realm_default_language'],
        enter_sends           = user_profile.enter_sends,
        user_id               = user_profile.id,
        left_side_userlist    = register_ret['left_side_userlist'],
        default_language      = register_ret['default_language'],
        default_language_name = get_language_name(register_ret['default_language']),
        language_list_dbl_col = get_language_list_for_templates(register_ret['default_language']),
        language_list         = get_language_list(),
        referrals             = register_ret['referrals'],
        realm_emoji           = register_ret['realm_emoji'],
        needs_tutorial        = needs_tutorial,

def zulip_default_context(request: HttpRequest) -> Dict[str, Any]:
    """Context available to all Zulip Jinja2 templates that have a request
    passed in.  Designed to provide the long list of variables at the
    bottom of this function in a wide range of situations: logged-in
    or logged-out, subdomains or not, etc.

    The main variable in the below is whether we know what realm the
    user is trying to interact with.
    """
    realm = get_realm_from_request(request)

    if realm is None:
        realm_uri = settings.ROOT_DOMAIN_URI
        realm_name = None
        realm_icon = None
        realm_description = None
        realm_invite_required = False
        realm_plan_type = 0
    else:
        realm_uri = realm.uri
        realm_name = realm.name
        realm_icon = get_realm_icon_url(realm)
        realm_description_raw = realm.description or "The coolest place in the universe."
        realm_description = bugdown_convert(realm_description_raw, message_realm=realm)
        realm_invite_required = realm.invite_required
        realm_plan_type = realm.plan_type

    register_link_disabled = settings.REGISTER_LINK_DISABLED
    login_link_disabled = settings.LOGIN_LINK_DISABLED
    find_team_link_disabled = settings.FIND_TEAM_LINK_DISABLED
    allow_search_engine_indexing = False

    if (settings.ROOT_DOMAIN_LANDING_PAGE
            and get_subdomain(request) == Realm.SUBDOMAIN_FOR_ROOT_DOMAIN):
        register_link_disabled = True
        login_link_disabled = True
        find_team_link_disabled = False
        allow_search_engine_indexing = True

    apps_page_url = 'https://zulipchat.com/apps/'
    if settings.ZILENCER_ENABLED:
        apps_page_url = '/apps/'

    user_is_authenticated = False
    if hasattr(request, 'user') and hasattr(request.user, 'is_authenticated'):
        user_is_authenticated = request.user.is_authenticated.value

    if settings.DEVELOPMENT:
        secrets_path = "zproject/dev-secrets.conf"
        settings_path = "zproject/dev_settings.py"
        settings_comments_path = "zproject/prod_settings_template.py"
    else:
        secrets_path = "/etc/zulip/zulip-secrets.conf"
        settings_path = "/etc/zulip/settings.py"
        settings_comments_path = "/etc/zulip/settings.py"

    # We can't use request.client here because we might not be using
    # an auth decorator that sets it, but we can call its helper to
    # get the same result.
    platform = get_client_name(request, True)

    context = {
        'root_domain_landing_page': settings.ROOT_DOMAIN_LANDING_PAGE,
        'custom_logo_url': settings.CUSTOM_LOGO_URL,
        'register_link_disabled': register_link_disabled,
        'login_link_disabled': login_link_disabled,
        'terms_of_service': settings.TERMS_OF_SERVICE,
        'privacy_policy': settings.PRIVACY_POLICY,
        'login_url': settings.HOME_NOT_LOGGED_IN,
        'only_sso': settings.ONLY_SSO,
        'external_host': settings.EXTERNAL_HOST,
        'external_uri_scheme': settings.EXTERNAL_URI_SCHEME,
        'realm_invite_required': realm_invite_required,
        'realm_uri': realm_uri,
        'realm_name': realm_name,
        'realm_icon': realm_icon,
        'realm_description': realm_description,
        'realm_plan_type': realm_plan_type,
        'root_domain_uri': settings.ROOT_DOMAIN_URI,
        'apps_page_url': apps_page_url,
        'open_realm_creation': settings.OPEN_REALM_CREATION,
        'password_auth_enabled': password_auth_enabled(realm),
        'require_email_format_usernames': require_email_format_usernames(realm),
        'any_oauth_backend_enabled': any_oauth_backend_enabled(realm),
        'no_auth_enabled': not auth_enabled_helper(list(AUTH_BACKEND_NAME_MAP.keys()), realm),
        'development_environment': settings.DEVELOPMENT,
        'support_email': FromAddress.SUPPORT,
        'find_team_link_disabled': find_team_link_disabled,
        'password_min_length': settings.PASSWORD_MIN_LENGTH,
        'password_min_guesses': settings.PASSWORD_MIN_GUESSES,
        'jitsi_server_url': settings.JITSI_SERVER_URL,
        'two_factor_authentication_enabled': settings.TWO_FACTOR_AUTHENTICATION_ENABLED,
        'zulip_version': ZULIP_VERSION,
        'latest_release_version': LATEST_RELEASE_VERSION,
        'latest_major_version': LATEST_MAJOR_VERSION,
        'latest_release_announcement': LATEST_RELEASE_ANNOUNCEMENT,
        'user_is_authenticated': user_is_authenticated,
        'settings_path': settings_path,
        'secrets_path': secrets_path,
        'settings_comments_path': settings_comments_path,
#.........这里部分代码省略.........

def fetch_initial_state_data(user_profile, event_types, queue_id,
                             include_subscribers=True):
    # type: (UserProfile, Optional[Iterable[str]], str, bool) -> Dict[str, Any]
    state = {'queue_id': queue_id}  # type: Dict[str, Any]

    if event_types is None:
        want = lambda msg_type: True
    else:
        want = set(event_types).__contains__

    if want('alert_words'):
        state['alert_words'] = user_alert_words(user_profile)

    if want('custom_profile_fields'):
        fields = custom_profile_fields_for_realm(user_profile.realm.id)
        state['custom_profile_fields'] = [f.as_dict() for f in fields]

    if want('attachments'):
        state['attachments'] = user_attachments(user_profile)

    if want('hotspots'):
        state['hotspots'] = get_next_hotspots(user_profile)

    if want('message'):
        # The client should use get_messages() to fetch messages
        # starting with the max_message_id.  They will get messages
        # newer than that ID via get_events()
        messages = Message.objects.filter(usermessage__user_profile=user_profile).order_by('-id')[:1]
        if messages:
            state['max_message_id'] = messages[0].id
        else:
            state['max_message_id'] = -1

    if want('muted_topics'):
        state['muted_topics'] = ujson.loads(user_profile.muted_topics)

    if want('pointer'):
        state['pointer'] = user_profile.pointer

    if want('presence'):
        state['presences'] = get_status_dict(user_profile)

    if want('realm'):
        for property_name in Realm.property_types:
            state['realm_' + property_name] = getattr(user_profile.realm, property_name)

        # Most state is handled via the property_types framework;
        # these manual entries are for those realm settings that don't
        # fit into that framework.
        state['realm_authentication_methods'] = user_profile.realm.authentication_methods_dict()
        state['realm_allow_message_editing'] = user_profile.realm.allow_message_editing
        state['realm_message_content_edit_limit_seconds'] = user_profile.realm.message_content_edit_limit_seconds
        state['realm_icon_url'] = realm_icon_url(user_profile.realm)
        state['realm_icon_source'] = user_profile.realm.icon_source
        state['max_icon_file_size'] = settings.MAX_ICON_FILE_SIZE
        state['realm_bot_domain'] = user_profile.realm.get_bot_domain()
        state['realm_uri'] = user_profile.realm.uri
        state['realm_presence_disabled'] = user_profile.realm.presence_disabled
        state['realm_show_digest_email'] = user_profile.realm.show_digest_email
        state['realm_is_zephyr_mirror_realm'] = user_profile.realm.is_zephyr_mirror_realm
        state['realm_password_auth_enabled'] = password_auth_enabled(user_profile.realm)
        if user_profile.realm.notifications_stream and not user_profile.realm.notifications_stream.deactivated:
            notifications_stream = user_profile.realm.notifications_stream
            state['realm_notifications_stream_id'] = notifications_stream.id
        else:
            state['realm_notifications_stream_id'] = -1

    if want('realm_domains'):
        state['realm_domains'] = get_realm_domains(user_profile.realm)

    if want('realm_emoji'):
        state['realm_emoji'] = user_profile.realm.get_emoji()

    if want('realm_filters'):
        state['realm_filters'] = realm_filters_for_realm(user_profile.realm_id)

    if want('realm_user'):
        state['realm_users'] = get_realm_user_dicts(user_profile)
        state['avatar_source'] = user_profile.avatar_source
        state['avatar_url_medium'] = avatar_url(user_profile, medium=True)
        state['avatar_url'] = avatar_url(user_profile)
        state['can_create_streams'] = user_profile.can_create_streams()
        state['cross_realm_bots'] = list(get_cross_realm_dicts())
        state['is_admin'] = user_profile.is_realm_admin
        state['user_id'] = user_profile.id
        state['enter_sends'] = user_profile.enter_sends
        state['email'] = user_profile.email
        state['full_name'] = user_profile.full_name

    if want('realm_bot'):
        state['realm_bots'] = get_owned_bot_dicts(user_profile)

    if want('subscription'):
        subscriptions, unsubscribed, never_subscribed = gather_subscriptions_helper(
            user_profile, include_subscr