dashboard: fix supervisor auth doing I/O in the event loop (#5807)

esphome/dashboard/web_server.py

@@ -13,9 +13,9 @@ import secrets
 import shutil
 import subprocess
 import threading
-from pathlib import Path
-from typing import Any, Callable, TypeVar
 from collections.abc import Iterable
+from pathlib import Path
+from typing import TYPE_CHECKING, Any, Callable, TypeVar
 
 import tornado
 import tornado.concurrent
@@ -45,12 +45,17 @@ from .util.file import write_file
 from .util.subprocess import async_run_system_command
 from .util.text import friendly_name_slugify
 
+if TYPE_CHECKING:
+    from requests import Response
+
+
 _LOGGER = logging.getLogger(__name__)
 
 ENV_DEV = "ESPHOME_DASHBOARD_DEV"
 
+COOKIE_AUTHENTICATED_YES = b"yes"
 
-cookie_authenticated_yes = b"yes"
+AUTH_COOKIE_NAME = "authenticated"
 
 
 settings = DASHBOARD.settings
@@ -89,18 +94,18 @@ def authenticated(func: T) -> T:
     return decorator
 
 
-def is_authenticated(request_handler):
+def is_authenticated(handler: BaseHandler) -> bool:
+    """Check if the request is authenticated."""
     if settings.on_ha_addon:
         # Handle ingress - disable auth on ingress port
         # X-HA-Ingress is automatically stripped on the non-ingress server in nginx
-        header = request_handler.request.headers.get("X-HA-Ingress", "NO")
+        header = handler.request.headers.get("X-HA-Ingress", "NO")
         if str(header) == "YES":
             return True
+
     if settings.using_auth:
-        return (
-            request_handler.get_secure_cookie("authenticated")
-            == cookie_authenticated_yes
-        )
+        return handler.get_secure_cookie(AUTH_COOKIE_NAME) == COOKIE_AUTHENTICATED_YES
+
     return True
 
 
@@ -860,38 +865,45 @@ class LoginHandler(BaseHandler):
             **template_args(),
         )
 
-    def post_ha_addon_login(self) -> None:
+    def _make_supervisor_auth_request(self) -> Response:
+        """Make a request to the supervisor auth endpoint."""
         import requests
 
-        headers = {
-            "X-Supervisor-Token": os.getenv("SUPERVISOR_TOKEN"),
-        }
-
+        headers = {"X-Supervisor-Token": os.getenv("SUPERVISOR_TOKEN")}
         data = {
             "username": self.get_argument("username", ""),
             "password": self.get_argument("password", ""),
         }
-        try:
-            req = requests.post(
+        return requests.post(
             "http://supervisor/auth", headers=headers, json=data, timeout=30
         )
-            if req.status_code == 200:
-                self.set_secure_cookie("authenticated", cookie_authenticated_yes)
-                self.redirect("/")
-                return
+
+    async def post_ha_addon_login(self) -> None:
+        loop = asyncio.get_running_loop()
+        try:
+            req = await loop.run_in_executor(None, self._make_supervisor_auth_request)
         except Exception as err:  # pylint: disable=broad-except
             _LOGGER.warning("Error during Hass.io auth request: %s", err)
             self.set_status(500)
             self.render_login_page(error="Internal server error")
             return
+
+        if req.status_code == 200:
+            self._set_authenticated()
+            self.redirect("/")
+            return
         self.set_status(401)
         self.render_login_page(error="Invalid username or password")
 
+    def _set_authenticated(self) -> None:
+        """Set the authenticated cookie."""
+        self.set_secure_cookie(AUTH_COOKIE_NAME, COOKIE_AUTHENTICATED_YES)
+
     def post_native_login(self) -> None:
         username = self.get_argument("username", "")
         password = self.get_argument("password", "")
         if settings.check_password(username, password):
-            self.set_secure_cookie("authenticated", cookie_authenticated_yes)
+            self._set_authenticated()
             self.redirect("./")
             return
         error_str = (
@@ -900,9 +912,9 @@ class LoginHandler(BaseHandler):
         self.set_status(401)
         self.render_login_page(error=error_str)
 
-    def post(self) -> None:
+    async def post(self):
         if settings.using_ha_addon_auth:
-            self.post_ha_addon_login()
+            await self.post_ha_addon_login()
         else:
             self.post_native_login()
 
@@ -910,7 +922,7 @@ class LoginHandler(BaseHandler):
 class LogoutHandler(BaseHandler):
     @authenticated
     def get(self) -> None:
-        self.clear_cookie("authenticated")
+        self.clear_cookie(AUTH_COOKIE_NAME)
         self.redirect("./login")