add custom js code operation

src/core/operations/CustomCode.mjs

@@ -0,0 +1,54 @@
+/**
+ * @author kjcain [kyler@kylercain.com]
+ * @copyright Crown Copyright 2022
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import OperationError from "../errors/OperationError.mjs";
+
+/**
+ * Custom Code operation
+ */
+class CustomCode extends Operation {
+
+    /**
+     * CustomCode constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Custom Code";
+        this.module = "Default";
+        this.description = "Execute custom javascript code.";
+        this.infoURL = "";
+        this.inputType = "JSON";
+        this.outputType = "JSON";
+        this.args = [
+            {
+                name: "Code",
+                type: "text",
+                value: "return input;"
+            }
+        ];
+    }
+
+    /**
+     * @param {JSON} input
+     * @param {Object[]} args
+     * @returns {JSON}
+     */
+    run(input, args) {
+        const [customCode] = args;
+
+        try {
+            const wrappedCode = new Function("input", customCode);
+            return wrappedCode(input);
+        } catch (error) {
+            throw new OperationError(error);
+        }
+    }
+
+}
+
+export default CustomCode;