fix: metadata_creation: for SAML backend, use sp.config to render metadata

... because SAMLBackend modifies the config (adding encryption_keypairs to config)
and this modified config is stored under sp.config.

Otherwise, metadata created via the metadata-creation scripts (satosa-saml-metadata)
would be missing encryption keys (KeyDescriptor use="encryption").

Author: vladimir-mencl-eresearch

src/satosa/metadata_creation/saml_metadata.py

@@ -17,7 +17,7 @@
 
 
 def _create_entity_descriptor(entity_config):
-    cnf = Config().load(copy.deepcopy(entity_config))
+    cnf = entity_config if isinstance(entity_config,  Config) else Config().load(copy.deepcopy(entity_config))
     return entity_descriptor(cnf)
 
 
@@ -28,7 +28,7 @@ def _create_backend_metadata(backend_modules):
         if isinstance(plugin_module, SAMLBackend):
             logline = "Generating SAML backend '{}' metadata".format(plugin_module.name)
             logger.info(logline)
-            backend_metadata[plugin_module.name] = [_create_entity_descriptor(plugin_module.config["sp_config"])]
+            backend_metadata[plugin_module.name] = [_create_entity_descriptor(plugin_module.sp.config)]
 
     return backend_metadata