added a script task script to get a task data value based on key name… (#353)

* added a script task script to get a task data value based on key name w/ burnettk

* pyl

---------

Co-authored-by: jasquat <jasquat@users.noreply.github.com>

spiffworkflow-backend/src/spiffworkflow_backend/scripts/get_task_data_value.py

@@ -0,0 +1,38 @@
+from typing import Any
+
+from spiffworkflow_backend.models.script_attributes_context import ScriptAttributesContext
+from spiffworkflow_backend.scripts.script import Script
+
+
+class GetTaskDataValue(Script):
+    @staticmethod
+    def requires_privileged_permissions() -> bool:
+        """We have deemed this function safe to run without elevated permissions."""
+        return False
+
+    def get_description(self) -> str:
+        return (
+            "Checks to see if given value is in task data and returns its value. "
+            "If does not exist or is None, it returns the default value."
+        )
+
+    def run(self, script_attributes_context: ScriptAttributesContext, *args: Any, **kwargs: Any) -> Any:
+        variable_to_check = args[0]
+        default_value = args[1]
+
+        task = script_attributes_context.task
+        if task is None:
+            return default_value
+
+        task_data = task.data
+        if task_data is None:
+            return default_value
+
+        if variable_to_check not in task_data.keys():
+            return default_value
+
+        value = task_data[variable_to_check]
+        if value is None:
+            return default_value
+
+        return value

spiffworkflow-backend/tests/spiffworkflow_backend/scripts/test_get_task_data_value.py

@@ -0,0 +1,23 @@
+from flask import Flask
+from spiffworkflow_backend.models.script_attributes_context import ScriptAttributesContext
+from spiffworkflow_backend.scripts.get_task_data_value import GetTaskDataValue
+
+from tests.spiffworkflow_backend.helpers.base_test import BaseTest
+
+
+class TestGetTaskDataValue(BaseTest):
+    def test_get_task_data_value_script(
+        self,
+        app: Flask,
+        with_db_and_bpmn_file_cleanup: None,
+    ) -> None:
+        process_model_identifier = "test_process_model"
+        process_instance_id = 1
+        script_attributes_context = ScriptAttributesContext(
+            task=None,
+            environment_identifier="unit_testing",
+            process_instance_id=process_instance_id,
+            process_model_identifier=process_model_identifier,
+        )
+        result = GetTaskDataValue().run(script_attributes_context, "the_var_name", "the_default_value")
+        assert result == "the_default_value"