main.py

#!/usr/bin/env python3
import os
from pathlib import Path

from fastapi import Request
from starlette.middleware.base import BaseHTTPMiddleware, RequestResponseEndpoint
from starlette.middleware.sessions import SessionMiddleware
from starlette.responses import Response

from nicegui import app, core, ui
from nicegui.page_arguments import RouteMatch
from website import documentation, examples_page, fly, header, imprint_privacy, main_page, rate_limits, svg
from website.documentation.intersection_observer import IntersectionObserver as intersection_observer


@app.add_middleware
class DocsSetCacheControlMiddleware(BaseHTTPMiddleware):

    async def dispatch(self, request: Request, call_next: RequestResponseEndpoint) -> Response:
        response = await call_next(request)
        if request.url.path.startswith('/fonts/') or request.url.path.startswith('/static/'):
            response.headers['Cache-Control'] = core.app.config.cache_control_directives
        elif request.url.path.startswith('/examples/images/'):
            response.headers['Cache-Control'] = 'public, max-age=86400'  # 1 day
        return response


# session middleware is required for demo in documentation
app.add_middleware(SessionMiddleware, secret_key=os.environ.get('NICEGUI_SECRET_KEY', ''))
rate_limits.setup()

on_fly = fly.setup()

app.add_static_files('/favicon', str(Path(__file__).parent / 'website' / 'favicon'))
app.add_static_files('/fonts', str(Path(__file__).parent / 'website' / 'fonts'))
app.add_static_files('/static', str(Path(__file__).parent / 'website' / 'static'))
app.add_static_file(local_file=svg.PATH / 'logo.png', url_path='/logo.png')
app.add_static_file(local_file=svg.PATH / 'logo_square.png', url_path='/logo_square.png')

documentation.build_search_index()
documentation.build_tree()


@app.post('/dark_mode')
async def _post_dark_mode(request: Request) -> None:
    app.storage.browser['dark_mode'] = (await request.json()).get('value')


class custom_sub_pages(ui.sub_pages):
    def _render_page(self, match: RouteMatch) -> bool:
        if match.path == '/' and match.remaining_path:
            return False
        return super()._render_page(match)


@ui.page('/')
@ui.page('/examples')
@ui.page('/documentation')
@ui.page('/documentation/{path:path}')
@ui.page('/imprint_privacy')
def _main_page() -> None:
    ui.context.client.content.classes('p-0 gap-0')
    header.add_head_html()

    with ui.left_drawer() \
            .classes('column no-wrap gap-1 bg-[#eee] dark:bg-[#1b1b1b] mt-[-20px] px-8 py-20') \
            .style('height: calc(100% + 20px) !important') as menu:
        tree = ui.tree([], label_key='title', on_select=lambda e: ui.navigate.to(f'/documentation/{e.value}')) \
            .classes('w-full').props('accordion no-connectors no-selection-unset')
        tree.visible = False
        spinner = ui.image('/static/loading.gif').classes('w-8 h-8 m-auto').props('no-spinner no-transition')

        @intersection_observer
        def update_tree() -> None:
            tree.props['nodes'] = documentation.tree.nodes
            tree.visible = True
            spinner.delete()
    menu_button = header.add_header(menu)

    window_state = {'is_desktop': None}
    ui.on('is_desktop', lambda v: window_state.update(is_desktop=v.args))
    ui.add_head_html('''
        <script>
            const mediaQuery = window.matchMedia('(min-width: 1024px)');
            mediaQuery.addEventListener('change', e => emitEvent('is_desktop', e.matches));
            window.addEventListener('load', () => emitEvent('is_desktop', mediaQuery.matches));
        </script>
    ''')

    custom_sub_pages({
        '/': main_page.create,
        '/examples': examples_page.create,
        '/documentation': lambda: documentation.render_page(documentation.registry['']),
        '/documentation/{name}': lambda name: _documentation_detail_page(name, tree),
        '/imprint_privacy': imprint_privacy.create,
    }, show_404=False).classes('w-full')

    def _update_menu(path: str):
        if path.startswith('/documentation/'):
            menu_button.visible = True
            if window_state['is_desktop'] is not None:
                menu.value = window_state['is_desktop']
        else:
            menu_button.visible = False
            menu.value = False
    ui.context.client.sub_pages_router.on_path_changed(_update_menu)
    _update_menu(ui.context.client.sub_pages_router.current_path)


def _documentation_detail_page(name: str, tree: ui.tree) -> None:
    tree.props.update(expanded=documentation.tree.ancestors(name))
    tree.update()
    if name in documentation.registry:
        documentation.render_page(documentation.registry[name])
    elif name in documentation.redirects:
        ui.navigate.to('/documentation/' + documentation.redirects[name])
    else:
        ui.label(f'Documentation for "{name}" could not be found.').classes('absolute-center')


@app.get('/status')
def _status():
    return 'Ok'


# NOTE: do not reload on fly.io (see https://github.com/zauberzeug/nicegui/discussions/1720#discussioncomment-7288741)
ui.run(uvicorn_reload_includes='*.py, *.css, *.html', reload=not on_fly, reconnect_timeout=10.0)