Hass.io Add-on panel support for Ingress (#23185)

* Hass.io Add-on panel support for Ingress

* Revert part of discovery startup handling

* Add type

* Fix tests

* Add tests

* Fix lint

* Fix lint on test

homeassistant/components/hassio/addon_panel.py

@@ -0,0 +1,93 @@
+"""Implement the Ingress Panel feature for Hass.io Add-ons."""
+import asyncio
+import logging
+
+from aiohttp import web
+
+from homeassistant.components.http import HomeAssistantView
+from homeassistant.helpers.typing import HomeAssistantType
+
+from .const import ATTR_PANELS, ATTR_TITLE, ATTR_ICON, ATTR_ADMIN, ATTR_ENABLE
+from .handler import HassioAPIError
+
+_LOGGER = logging.getLogger(__name__)
+
+
+async def async_setup_addon_panel(hass: HomeAssistantType, hassio):
+    """Add-on Ingress Panel setup."""
+    hassio_addon_panel = HassIOAddonPanel(hass, hassio)
+    hass.http.register_view(hassio_addon_panel)
+
+    # If panels are exists
+    panels = await hassio_addon_panel.get_panels()
+    if not panels:
+        return
+
+    # Register available panels
+    jobs = []
+    for addon, data in panels.items():
+        if not data[ATTR_ENABLE]:
+            continue
+        jobs.append(_register_panel(hass, addon, data))
+
+    if jobs:
+        await asyncio.wait(jobs)
+
+
+class HassIOAddonPanel(HomeAssistantView):
+    """Hass.io view to handle base part."""
+
+    name = "api:hassio_push:panel"
+    url = "/api/hassio_push/panel/{addon}"
+
+    def __init__(self, hass, hassio):
+        """Initialize WebView."""
+        self.hass = hass
+        self.hassio = hassio
+
+    async def post(self, request, addon):
+        """Handle new add-on panel requests."""
+        panels = await self.get_panels()
+
+        # Panel exists for add-on slug
+        if addon not in panels or not panels[addon][ATTR_ENABLE]:
+            _LOGGER.error("Panel is not enable for %s", addon)
+            return web.Response(status=400)
+        data = panels[addon]
+
+        # Register panel
+        await _register_panel(self.hass, addon, data)
+        return web.Response()
+
+    async def delete(self, request, addon):
+        """Handle remove add-on panel requests."""
+        # Currently not supported by backend / frontend
+        return web.Response()
+
+    async def get_panels(self):
+        """Return panels add-on info data."""
+        try:
+            data = await self.hassio.get_ingress_panels()
+            return data[ATTR_PANELS]
+        except HassioAPIError as err:
+            _LOGGER.error("Can't read panel info: %s", err)
+        return {}
+
+
+def _register_panel(hass, addon, data):
+    """Init coroutine to register the panel.
+
+    Return coroutine.
+    """
+    return hass.components.frontend.async_register_built_in_panel(
+        frontend_url_path=addon,
+        webcomponent_name='hassio-main',
+        sidebar_title=data[ATTR_TITLE],
+        sidebar_icon=data[ATTR_ICON],
+        js_url='/api/hassio/app/entrypoint.js',
+        embed_iframe=True,
+        require_admin=data[ATTR_ADMIN],
+        config={
+            "ingress": addon
+        }
+    )