Email Service

email.service.ts

import { Injectable } from '@nestjs/common';
import * as sgMail from '@sendgrid/mail';
import * as Sentry from '@sentry/node';
import { PRODUCTION_ENV_NAME, DOMAIN_AND_EMAIL_WHITE_LIST } from '../settings';

const templateIds = {
  programPurchase: 'd-e8cd31b0131a48bba6041692ed38c9f6',
  injuryMarked: 'd-ccef4e3e556f42ee8e5750b9a0009d37',
};

const domains = {
  local: 'http://localhost:4000',
  dev: 'https://dev.app.gmb.io',
  stage: 'https://stage.app.gmb.io',
  production: 'https://app.gmb.io',
};

const getDomain = (domainList: { [domain: string]: string }) => {
  return domainList[process.env.NODE_ENV] || domainList.dev;
};

@Injectable()
export class EmailService {
  private fromEmail: string = process.env.EMAIL_FROM_ADDRESS; //  e.g 'GMB Fitness <howdy@gmb.io>';
  readonly defaultSettings;

  constructor() {
    sgMail.setApiKey(process.env.SENDGRID_API_KEY);
    this.defaultSettings = {
      from: this.fromEmail,
    };
  }

  async sendInjury(to, params: { firstName: string }): Promise<any> {
    const settings = {
      to,
      templateId: templateIds.injuryMarked,
      dynamic_template_data: {
        host: getDomain(domains),
        firstName: params.firstName,
      },
    };

    return this.send(settings);
  }

  async send(settings): Promise<any> {
    try {
      if (process.env.NODE_ENV !== PRODUCTION_ENV_NAME) {
        const subscribersDomain = settings.to.split('@')[1];

        if (
          !(
            DOMAIN_AND_EMAIL_WHITE_LIST.includes(subscribersDomain) ||
            DOMAIN_AND_EMAIL_WHITE_LIST.includes(settings.to)
          )
        ) {
          Sentry.addBreadcrumb({
            message: 'Email sending is disabled by `DOMAIN_WHITELIST` environment variable.',
          });
          return;
        }
      }

      await sgMail.send(Object.assign({}, this.defaultSettings, settings));
    } catch (e) {
      Sentry.captureMessage(e, { level: Sentry.Severity.Error });
    }
  }
}