Add mjpeg camera stream_source (#86908)

Co-authored-by: J. Nick Koston <nick@koston.org>

homeassistant/components/mjpeg/camera.py

@@ -10,6 +10,7 @@ from aiohttp import web
 import async_timeout
 import requests
 from requests.auth import HTTPBasicAuth, HTTPDigestAuth
+from yarl import URL
 
 from homeassistant.components.camera import Camera
 from homeassistant.config_entries import ConfigEntry
@@ -118,6 +119,15 @@ class MjpegCamera(Camera):
         if device_info is not None:
             self._attr_device_info = device_info
 
+    async def stream_source(self) -> str:
+        """Return the stream source."""
+        url = URL(self._mjpeg_url)
+        if self._username:
+            url = url.with_user(self._username)
+        if self._password:
+            url = url.with_password(self._password)
+        return str(url)
+
     async def async_camera_image(
         self, width: int | None = None, height: int | None = None
     ) -> bytes | None: