n8n/packages/nodes-base/nodes/Form/utils.ts

import type { IDataObject } from 'n8n-workflow';
import type { FormField, FormTriggerData, FormTriggerInput } from './interfaces';

export const prepareFormData = (
	formTitle: string,
	formDescription: string,
	formSubmittedText: string | undefined,
	formFields: FormField[],
	testRun: boolean,
	instanceId?: string,
) => {
	const validForm = formFields.length > 0;
	const utm_campaign = instanceId ? `&utm_campaign=${instanceId}` : '';
	const n8nWebsiteLink = `https://n8n.io/?utm_source=n8n-internal&utm_medium=form-trigger${utm_campaign}`;

	if (formSubmittedText === undefined) {
		formSubmittedText = 'Your response has been recorded';
	}

	const formData: FormTriggerData = {
		testRun,
		validForm,
		formTitle,
		formDescription,
		formSubmittedText,
		n8nWebsiteLink,
		formFields: [],
	};

	if (!validForm) {
		return formData;
	}

	for (const [index, field] of formFields.entries()) {
		const { fieldType, requiredField, multiselect } = field;

		const input: IDataObject = {
			id: `field-${index}`,
			errorId: `error-field-${index}`,
			label: field.fieldLabel,
			inputRequired: requiredField ? 'form-required' : '',
		};

		if (multiselect) {
			input.isMultiSelect = true;
			input.multiSelectOptions =
				field.fieldOptions?.values.map((e, i) => ({
					id: `option${i}`,
					label: e.option,
				})) ?? [];
		} else if (fieldType === 'dropdown') {
			input.isSelect = true;
			const fieldOptions = field.fieldOptions?.values ?? [];
			input.selectOptions = fieldOptions.map((e) => e.option);
		} else if (fieldType === 'textarea') {
			input.isTextarea = true;
		} else {
			input.isInput = true;
			input.type = fieldType as 'text' | 'number' | 'date';
		}

		formData.formFields.push(input as FormTriggerInput);
	}

	return formData;
};