ghost/core/server/api/canary/offers-public.js

const tpl = require('@tryghost/tpl');
const errors = require('@tryghost/errors');
const offersService = require('../../services/offers');

const messages = {
    offerNotFound: 'Offer not found.'
};

module.exports = {
    docName: 'offers',

    read: {
        data: ['id'],
        permissions: true,
        async query(frame) {
            const offer = await offersService.api.getOffer(frame.data);
            if (!offer) {
                throw new errors.NotFoundError({
                    message: tpl(messages.offerNotFound)
                });
            }

            frame.response = {
                offers: [offer]
            };
        }
    }
};