send email on password change

src/services/mail.service.ts

@@ -53,6 +53,19 @@ export class MailService {
     });
   }
 
+  async passwordChange(user: User): Promise<void> {
+    const subject = 'Password change';
+    const text = `Hi ${user.username},\n\nYour password has been changed successfully.\n\n
+      If this wasn't you, please reset your password or contact support at ${properties.app.email}.\n\nThank you,\nThe ${this.app} Team`;
+    const html = `Hi ${user.username},<br/><br/>
+      Your password has been changed successfully.<br/><br/>
+      If this wasn't you, please reset your password or <a href="mailto:${properties.app.email}">contact support</a>.<br/><br/>
+      Thank you,<br/>The ${this.app} Team`;
+    return this.transporter.send({
+      from: this.from, to: to(user), subject, text, html
+    });
+  }
+
   async magicLogin(user: User): Promise<void> {
     const token = magicLogin(user);
     const magicLoginUrl = `${properties.web.host}/${properties.web.endpoints.magicLogin}?token=${token}`;

src/services/user.service.ts

@@ -79,6 +79,7 @@ export class UserService {
     const user = await this.userRepository.findById(userId);
     this.verifyPassword(user, oldPassword);
     await this.userRepository.update(userId, {hash: hashPassword(newPassword)});
+    await this.mailService.passwordChange(user);
     this.log.info(`Changed password for userId=${userId}`);
   }