Snowflake Apps: gate deprecated Snowpark processor behind a feature flag [SNOW-3417033]

RELEASE-NOTES.md

@@ -15,6 +15,7 @@
  -->
 # Unreleased version
 ## Backward incompatibility
+* The deprecated Snowpark annotation processor (`processors: [snowpark]` in a Native App project definition) is now opt-in. Bundling or deploying a Native App with a `snowpark` processor no longer executes it unless the `ENABLE_SNOWPARK_ANNOTATION_PROCESSOR` feature flag is turned on (`snowflake.cli.features.enable_snowpark_annotation_processor = true` in `config.toml`, or `SNOWFLAKE_CLI_FEATURES_ENABLE_SNOWPARK_ANNOTATION_PROCESSOR=1`). The processor's job is to execute every annotated `.py` artifact in a subprocess so that module-level objects can be introspected; gating it behind an explicit opt-in aligns its long-deprecated status with its cost and closes an arbitrary-code-execution path for repository-level attack scenarios.
 
 ## Deprecations
 

src/snowflake/cli/_plugins/nativeapp/codegen/snowpark/python_processor.py

@@ -51,6 +51,7 @@
 from snowflake.cli.api.cli_global_context import get_cli_context, span
 from snowflake.cli.api.console import cli_console
 from snowflake.cli.api.console import cli_console as cc
+from snowflake.cli.api.feature_flags import FeatureFlag
 from snowflake.cli.api.metrics import CLICounterField
 from snowflake.cli.api.project.schemas.entities.common import (
     PathMapping,
@@ -170,6 +171,10 @@ class SnowparkAnnotationProcessor(ArtifactProcessor):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
+    @staticmethod
+    def is_enabled() -> bool:
+        return FeatureFlag.ENABLE_SNOWPARK_ANNOTATION_PROCESSOR.is_enabled()
+
     @span("snowpark_processor")
     def process(
         self,

src/snowflake/cli/api/feature_flags.py

@@ -64,6 +64,9 @@ class FeatureFlag(FeatureFlagMixin):
     ENABLE_NATIVE_APP_PYTHON_SETUP = BooleanFlag(
         "ENABLE_NATIVE_APP_PYTHON_SETUP", False
     )
+    ENABLE_SNOWPARK_ANNOTATION_PROCESSOR = BooleanFlag(
+        "ENABLE_SNOWPARK_ANNOTATION_PROCESSOR", False
+    )
     ENABLE_NATIVE_APP_CHILDREN = BooleanFlag("ENABLE_NATIVE_APP_CHILDREN", False)
     # TODO 4.0: remove ENABLE_RELEASE_CHANNELS
     ENABLE_RELEASE_CHANNELS = BooleanFlag("ENABLE_RELEASE_CHANNELS", None)

tests/nativeapp/test_feature_flags.py

@@ -29,3 +29,19 @@ def test_feature_setup_script_generation_enabled(
     mock_get_config_value.assert_called_once_with(
         "cli", "features", key="enable_native_app_python_setup", default=None
     )
+
+
+@mock.patch("snowflake.cli.api.config.get_config_value")
+@pytest.mark.parametrize("value_from_config", [True, False])
+def test_feature_snowpark_annotation_processor_enabled(
+    mock_get_config_value, value_from_config
+):
+    mock_get_config_value.return_value = value_from_config
+
+    assert (
+        FeatureFlag.ENABLE_SNOWPARK_ANNOTATION_PROCESSOR.is_enabled()
+        is value_from_config
+    )
+    mock_get_config_value.assert_called_once_with(
+        "cli", "features", key="enable_snowpark_annotation_processor", default=None
+    )