Implemented a basic mailer with reset link sending

ref #118

src/mailer.ts

@@ -1,7 +1,44 @@
-
+import nodemailer from 'nodemailer';
+import { MailOptions } from 'nodemailer/lib/json-transport';
+import Mail from 'nodemailer/lib/mailer';
+import { config } from './config';
+import { MailServerConfigError } from './errors/MailErrors';
+import { User } from './models/entities/User';
 /**
  * This class is responsible for all things mail sending.
  */
 export class Mailer {
+    private transport: Mail;
 
+    constructor() {
+        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();
+            }
+        });
+    }
+
+    public async sendResetMail(user: User, token: String) {
+        const reset_link = `${config.app_url}/reset/${token}`
+        const mail: MailOptions = {
+            to: user.email,
+            subject: "LfK! Password Reset",
+            html: `<b>${reset_link}</b>`
+        };
+        await this.sendMail(mail);
+    }
+
+    public async sendMail(mail: MailOptions) {
+        mail.from = config.mail_from;
+        await this.transport.sendMail(mail);
+    }
 }