Added basic mailer that can send pw reset mails

src/Mailer.ts

@@ -0,0 +1,96 @@
+import fs from "fs";
+import Handlebars from 'handlebars';
+import i18next from "i18next";
+import Backend from 'i18next-fs-backend';
+import nodemailer from 'nodemailer';
+import { MailOptions } from 'nodemailer/lib/json-transport';
+import Mail from 'nodemailer/lib/mailer';
+import path from 'path';
+import { config } from './config';
+import { MailServerConfigError } from './errors/MailErrors';
+
+
+/**
+ * This class is responsible for all things pdf creation.
+ * This uses the html templates from src/templates.
+ */
+export class Mailer {
+    private templateDir = path.join(__dirname, '/templates');
+    private transport: Mail;
+    private static interpolations = { eventname: config.eventname }
+
+    /**
+     * Main constructor.
+     * Initializes i18n(ext), Handlebars and puppeteer.
+     */
+    constructor() {
+        this.init();
+    }
+
+    /**
+     * Main constructor.
+     * Initializes i18n(ext), Handlebars and puppeteer.
+     */
+    public async init() {
+        await i18next
+            .use(Backend)
+            .init({
+                fallbackLng: 'en',
+                lng: 'en',
+                backend: {
+                    loadPath: path.join(__dirname, '/locales/{{lng}}.json')
+                }
+            });
+        await Handlebars.registerHelper('__',
+            function (str) {
+                return i18next.t(str, Mailer.interpolations).toString();
+            }
+        );
+        this.transport = nodemailer.createTransport({
+            host: config.mail_server,
+            port: config.mail_port,
+            auth: {
+                user: config.mail_user,
+                pass: config.mail_password
+            }
+        });
+
+        this.transport.verify(function (error, success) {
+            if (error) {
+                throw new MailServerConfigError();
+            }
+        });
+    }
+
+    /**
+ * Function for sending a test mail from the test mail template.
+ * @param to_address The address the mail will be sent to. Should always get pulled from a user object.
+ * @param token The requested password reset token - will be combined with the app_url to generate a password reset link.
+ */
+    public async sendResetMail(to_address: string, token: string, locale: string = "en") {
+        await i18next.changeLanguage(locale);
+
+        const reset_link = `${config.app_url}/reset/${(Buffer.from(token)).toString("base64")}`
+        const template_html = Handlebars.compile(fs.readFileSync(__dirname + '/static/mail_templates/pw-reset.html', { encoding: 'utf8' }));
+        const template_txt = Handlebars.compile(fs.readFileSync(__dirname + '/static/mail_templates/pw-reset.html', { encoding: 'utf8' }));
+        const body_html = template_html({ recipient_mail: to_address, copyright_owner: config.copyright_owner, link_imprint: `${config.app_url}/imprint`, link_privacy: `${config.app_url}/privacy`, reset_link });
+        const body_txt = template_txt({ recipient_mail: to_address, copyright_owner: config.copyright_owner, link_imprint: `${config.app_url}/imprint`, link_privacy: `${config.app_url}/privacy`, reset_link });
+
+        const mail: MailOptions = {
+            to: to_address,
+            subject: i18next.t("subject_reset", Mailer.interpolations).toString(),
+            text: body_txt,
+            html: body_html
+        };
+        await this.sendMail(mail);
+    }
+
+    /**
+     * Wrapper function for sending a mail via this object's transporter.
+     * @param mail MailOptions object containing the 
+     */
+    public async sendMail(mail: MailOptions) {
+        mail.from = config.mail_from;
+        await this.transport.sendMail(mail);
+    }
+}