fix(gateway): validate multiplex adapter config by platform

plugins/platforms/homeassistant/adapter.py

@@ -41,13 +41,13 @@ logger = logging.getLogger(__name__)
 
 def check_ha_requirements() -> bool:
     """Check if Home Assistant runtime dependencies are available."""
-    return bool(AIOHTTP_AVAILABLE)
+    return AIOHTTP_AVAILABLE
 
 
 def validate_ha_config(config: PlatformConfig) -> bool:
-    """Accept either a scoped config token or an env-provided HASS_TOKEN."""
-    token = getattr(config, "token", None) or os.getenv("HASS_TOKEN", "")
-    return bool(str(token or "").strip())
+    """Return True when Home Assistant has enough credential config to connect."""
+    token = (getattr(config, "token", None) or os.getenv("HASS_TOKEN", "")).strip()
+    return bool(token)
 
 
 class HomeAssistantAdapter(BasePlatformAdapter):

plugins/platforms/mattermost/adapter.py

@@ -51,15 +51,7 @@ _RECONNECT_JITTER = 0.2
 
 
 def check_mattermost_requirements() -> bool:
-    """Return True if the Mattermost adapter can be used."""
-    token = os.getenv("MATTERMOST_TOKEN", "")
-    url = os.getenv("MATTERMOST_URL", "")
-    if not token:
-        logger.debug("Mattermost: MATTERMOST_TOKEN not set")
-        return False
-    if not url:
-        logger.warning("Mattermost: MATTERMOST_URL not set")
-        return False
+    """Return True if the Mattermost adapter runtime dependency is available."""
     try:
         import aiohttp  # noqa: F401
         return True
@@ -68,6 +60,20 @@ def check_mattermost_requirements() -> bool:
         return False
 
 
+def validate_mattermost_config(config: PlatformConfig) -> bool:
+    """Return True when Mattermost has enough config to connect."""
+    extra = getattr(config, "extra", {}) or {}
+    token = (getattr(config, "token", None) or os.getenv("MATTERMOST_TOKEN", "")).strip()
+    url = (extra.get("url", "") or os.getenv("MATTERMOST_URL", "")).strip()
+    if not token:
+        logger.debug("Mattermost: MATTERMOST_TOKEN not set")
+        return False
+    if not url:
+        logger.warning("Mattermost: MATTERMOST_URL not set")
+        return False
+    return True
+
+
 class MattermostAdapter(BasePlatformAdapter):
     """Gateway adapter for Mattermost (self-hosted or cloud)."""
 
@@ -1248,6 +1254,7 @@ def register(ctx) -> None:
         label="Mattermost",
         adapter_factory=_build_adapter,
         check_fn=check_mattermost_requirements,
+        validate_config=validate_mattermost_config,
         is_connected=_is_connected,
         required_env=["MATTERMOST_URL", "MATTERMOST_TOKEN"],
         install_hint="pip install aiohttp",