fix: use providers attribute 'metadata' when necessary

Author: anesson-cs

stac_fastapi/eodag/models/stac_metadata.py

@@ -36,6 +36,7 @@
 from stac_pydantic.shared import Provider
 from typing_extensions import Self
 
+from eodag.api.provider import Provider as EodagProvider
 from stac_fastapi.eodag.extensions.stac import (
     BaseStacExtension,
 )
@@ -205,13 +206,13 @@ def get_federation_backend_dict(request: Request, provider_name: str) -> dict[st
     :param provider_name: provider name
     :return: Federation backend dictionary
     """
-    provider = next(
-        p for p in request.app.state.dag.providers.values() if provider_name in [p.name, getattr(p, "group", None)]
+    provider: EodagProvider = next(
+        cast(EodagProvider, p) for p in request.app.state.dag.providers.values() if provider_name in [p.name, p.metadata.get("group", None)]
     )
     return {
-        "title": provider.group or provider.name,
-        "description": provider.title,
-        "url": provider.url,
+        "title": provider.metadata.get("group", None) or provider.name,
+        "description": provider.metadata.get("description", None),
+        "url": provider.metadata.get("url", None),
     }