userController.swift

import Fluent
import Vapor

struct UserController {    
    func create(req: Request) throws -> EventLoopFuture<User> {
           let receivedData = try req.content.decode(User.Create.self)
           let user = try User(name: receivedData.name,
                               email: receivedData.email,
                               passwordHash: Bcrypt.hash(receivedData.password))
           return user.save(on: req.db).transform(to: user)
       }
       
       func login(req: Request) throws -> EventLoopFuture<UserToken> {
           let user = try req.auth.require(User.self)
           let token = try user.generateToken()
           return token.save(on: req.db).transform(to: token)
       }
    
}

extension User {
    struct Create: Content {
        var name: String
        var email: String
        var password: String
    }
}

extension User: ModelAuthenticatable {
    
    static var usernameKey = \User.$email
    static var passwordHashKey = \User.$passwordHash
    
    func verify(password: String) throws -> Bool {
            return try Bcrypt.verify(password, created: self.passwordHash)
        }
    
    func generateToken() throws -> UserToken {
            return try UserToken(value: [UInt8].random(count: 16).base64,
                             userID: self.requireID())
        }
}