import * as _ from 'lodash';
import { objects, template } from '@strapi/utils';

const { createStrictInterpolationRegExp } = template;
const getProviderSettings = ()=>strapi.config.get('plugin::email');
const send = async (options)=>strapi.plugin('email').provider.send(options);
/**
 * fill subject, text and html using lodash template
 * @param {object} emailOptions - to, from and replyto...
 * @param {object} emailTemplate - object containing attributes to fill
 * @param {object} data - data used to fill the template
 * @returns {{ subject, text, subject }}
 */ const sendTemplatedEmail = (emailOptions, emailTemplate, data)=>{
    const attributes = [
        'subject',
        'text',
        'html'
    ];
    const missingAttributes = _.difference(attributes, Object.keys(emailTemplate));
    if (missingAttributes.length > 0) {
        throw new Error(`Following attributes are missing from your email template : ${missingAttributes.join(', ')}`);
    }
    const allowedInterpolationVariables = objects.keysDeep(data);
    const interpolate = createStrictInterpolationRegExp(allowedInterpolationVariables, 'g');
    const templatedAttributes = attributes.reduce((compiled, attribute)=>emailTemplate[attribute] ? Object.assign(compiled, {
            [attribute]: _.template(emailTemplate[attribute], {
                interpolate
            })(data)
        }) : compiled, {});
    return strapi.plugin('email').provider.send({
        ...emailOptions,
        ...templatedAttributes
    });
};
const emailService = ()=>({
        getProviderSettings,
        send,
        sendTemplatedEmail
    });

export { emailService as default };
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