refactor: Moves the Explore form_data endpoint (#18151)

* refactor: Moves the Explore form_data endpoint

* Removes unused imports

* Fixes openapi schema error

* Fixes typo

* Renames and UPDATING.md

superset/explore/form_data/commands/get.py

@@ -0,0 +1,58 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+import logging
+from abc import ABC
+from typing import Optional
+
+from flask import current_app as app
+from sqlalchemy.exc import SQLAlchemyError
+
+from superset.commands.base import BaseCommand
+from superset.explore.form_data.commands.parameters import CommandParameters
+from superset.explore.form_data.commands.state import TemporaryExploreState
+from superset.explore.form_data.utils import check_access
+from superset.extensions import cache_manager
+from superset.key_value.commands.exceptions import KeyValueGetFailedError
+
+logger = logging.getLogger(__name__)
+
+
+class GetFormDataCommand(BaseCommand, ABC):
+    def __init__(self, cmd_params: CommandParameters) -> None:
+        self._cmd_params = cmd_params
+        config = app.config["EXPLORE_FORM_DATA_CACHE_CONFIG"]
+        self._refresh_timeout = config.get("REFRESH_TIMEOUT_ON_RETRIEVAL")
+
+    def run(self) -> Optional[str]:
+        try:
+            actor = self._cmd_params.actor
+            key = self._cmd_params.key
+            state: TemporaryExploreState = cache_manager.explore_form_data_cache.get(
+                key
+            )
+            if state:
+                check_access(state["dataset_id"], state["chart_id"], actor)
+                if self._refresh_timeout:
+                    cache_manager.explore_form_data_cache.set(key, state)
+                return state["form_data"]
+            return None
+        except SQLAlchemyError as ex:
+            logger.exception("Error running get command")
+            raise KeyValueGetFailedError() from ex
+
+    def validate(self) -> None:
+        pass