Email confirmation feature

[d0peCode]

Added email confirmation feature:

• credentails needed to send email are in .env.examle and used in config/index.js
  • README.md udpated to additional tips about setting transporter
  • Added uuid package to create unique key for account activation
  • Created transporter.js in services
  • Added active: Boolean and activationKey: String in user model
  • Added userSchema.post('save', async function with function which is sending email after save in user.model file (below .pre hook)
  • Added if (!user.active) throw new APIError(User not activated, httpStatus.UNAUTHORIZED) in user.model file within findAndGenerateToken function, in order to not let inactive user login.
  • Added /confirm route which is invoked after clicking link from mail.

Please do code review. Especially things I don't know are:

• in userSchema.method({ there is this array const fields = ['id', 'name', 'email', 'createdAt', 'role'] shoudn't it contain two new fields (active and activationKey)?

• in .pre hook there is this condition:

  
  if (!this.isModified('password')) {
      return next()
  }
  which I don't have in `.post` hook. Should it be there?

[kasvith]

@d0peCode can you please check why travis build fails?

[kasvith]

@d0peCode can you pull from master? made some changes to fix travis

[d0peCode]

Merge remote-tracking branch 'upstream/master' into emailConfirmation

Travis is still failing:

npm ERR! Missing: nodemailer@^6.2.1 npm ERR! Missing: uuid@^3.3.2

[kasvith]

Now it works 💯

[kasvith]

Thanks, @d0peCode you did a great job