first commit

packages/nodes-base/nodes/Form/utils/formNodeUtils.ts

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+import { type Response } from 'express';
+import {
+	type NodeTypeAndVersion,
+	type IWebhookFunctions,
+	type FormFieldsParameter,
+	type IWebhookResponseData,
+	NodeOperationError,
+	FORM_TRIGGER_NODE_TYPE,
+} from 'n8n-workflow';
+
+import { renderForm } from './utils';
+
+export const renderFormNode = async (
+	context: IWebhookFunctions,
+	res: Response,
+	trigger: NodeTypeAndVersion,
+	fields: FormFieldsParameter,
+	mode: 'test' | 'production',
+): Promise<IWebhookResponseData> => {
+	const options = context.getNodeParameter('options', {}) as {
+		formTitle: string;
+		formDescription: string;
+		buttonLabel: string;
+		customCss?: string;
+	};
+
+	let title = options.formTitle;
+	if (!title) {
+		title = context.evaluateExpression(`{{ $('${trigger?.name}').params.formTitle }}`) as string;
+	}
+
+	const description = options.formDescription ?? '';
+
+	let buttonLabel = options.buttonLabel;
+	if (!buttonLabel) {
+		buttonLabel =
+			(context.evaluateExpression(
+				`{{ $('${trigger?.name}').params.options?.buttonLabel }}`,
+			) as string) || 'Submit';
+	}
+
+	const appendAttribution = context.evaluateExpression(
+		`{{ $('${trigger?.name}').params.options?.appendAttribution === false ? false : true }}`,
+	) as boolean;
+
+	renderForm({
+		context,
+		res,
+		formTitle: title,
+		formDescription: description,
+		formFields: fields,
+		responseMode: 'responseNode',
+		mode,
+		redirectUrl: undefined,
+		appendAttribution,
+		buttonLabel,
+		customCss: options.customCss,
+	});
+
+	return {
+		noWebhookResponse: true,
+	};
+};
+
+/**
+ * Retrieves the active Form Trigger node from the workflow's parent nodes.
+ *
+ * This function searches through the parent nodes to find Form Trigger nodes,
+ * then determines which one has been executed.
+ *
+ * @returns The NodeTypeAndVersion object representing the active Form Trigger node
+ * @throws {NodeOperationError} When no Form Trigger node is found in parent nodes
+ * @throws {NodeOperationError} When Form Trigger node exists but was not executed
+ */
+export function getFormTriggerNode(context: IWebhookFunctions): NodeTypeAndVersion {
+	const parentNodes = context.getParentNodes(context.getNode().name);
+
+	const formTriggers = parentNodes.filter((node) => node.type === FORM_TRIGGER_NODE_TYPE);
+
+	if (!formTriggers.length) {
+		throw new NodeOperationError(
+			context.getNode(),
+			'Form Trigger node must be set before this node',
+		);
+	}
+
+	for (const trigger of formTriggers) {
+		try {
+			context.evaluateExpression(`{{ $('${trigger.name}').first() }}`);
+		} catch (error) {
+			continue;
+		}
+		return trigger;
+	}
+
+	throw new NodeOperationError(context.getNode(), 'Form Trigger node was not executed');
+}