isp-utils.js

// INTERCEPTOR -- add this in your request interceptor to auto-populate ISPs in your session attributes.

let sessionAttributes = handlerInput.attributesManager.getSessionAttributes() || {};

if (handlerInput.requestEnvelope.session['new'] || !sessionAttributes.inSkillProducts) {

	let inSkillProductArray, persistentAttributes, ispObject;

	// first populate ISP info
	try {
		const locale = handlerInput.requestEnvelope.request.locale;
		const ms = handlerInput.serviceClientFactory.getMonetizationServiceClient();
		ispObject = await ms.getInSkillProducts(locale);
		inSkillProductArray = ispObject.inSkillProducts;
	} catch (e) {
		console.log('RequestInterceptor:: could not retrieve ISPs');
	}

	// then populate persistent attributes
	try {
		persistentAttributes = await handlerInput.attributesManager.getPersistentAttributes();
	} catch (e) {
		console.log('RequestInterceptor:: could not retrieve persistent attributes');
	}

	const sessionAttributes = { 
		...persistentAttributes, 
		inSkillProducts: inSkillProductArray 
	}

	// check if user is premium and save it to sessionAttributes
	sessionAttributes.premium = utils.isPremium(sessionAttributes);
	handlerInput.attributesManager.setSessionAttributes(sessionAttributes);
}

/// ----- 

/**
 * Checks whether the product exists, and returns the ISP object.
 * @param {array} inSkillProducts list of In Skill Products available
 * @param {string} productName name of product to look for
 * @returns {object|boolean}
 */
function getProductByName(inSkillProducts, productName) {
	const filteredProducts = inSkillProducts.filter(record => record.referenceName === productName)
	let product;
	if(filteredProducts && filteredProducts.length > 0) {
		product = filteredProducts[0];
	}
	return product || false;
}