index.ts

import { BasicServer, auth, errors, User } from 'realm-object-server'
import * as Realm from 'realm'
import * as path from 'path'
import { login } from './fake-company-login' // this is just some fake

const server = new BasicServer()

class MyCustomAuth extends auth.AuthProvider {

    name = "mycustomauth"

    async authenticateOrCreateUser(body: any): Promise<User> {
        try {
            const user_info = body.user_info

            const userId: string = user_info.userId
            const pin: string = user_info.pin
            const departmentId: string = user_info.departmentId

            const response = await login(userId, pin, departmentId)

            return this.service.createOrUpdateUser(
                response.userId, // this is your company's way of identifying your userId
                this.name, // this should always be set to this.name
                response.isAdmin, { // add some meta data to this user
                    departmentId: response.departmentId,
                    email: response.email
                })
        } catch (err) {
            throw new errors.realm.InvalidCredentials({ detail: err })
        }
    }

}

const start = async () => {
    try {
        await server.start({
            // This is the location where ROS will store its runtime data
            dataPath: path.join(__dirname, '../data'),
            // register the auth provider
            authProviders: [new MyCustomAuth()],
            featureToken: "<YOUR-FEATURE-TOKEN>",
        })

        console.log(`Realm Object Server was started on ${server.address}`)

        // the server has started now! let's post some json data up

        // this is some custom payload you can send to the Realm Object Server backend
        // in the `authenticateOrCreateUser` you'll find this data mapped to body.user_info
        const customLoginPayload = {
            userId: 'joe',
            pin: '1234',
            departmentId: 'sales'
        }

        const credentials = Realm.Sync.Credentials.custom(
            'mycustomauth', // make sure this matches your MyCustomAuth.name so that the request is mapped to the correct authentication provider
            '', // you don't have to worry about this.
            customLoginPayload) // this is your custom payload

        const user = await Realm.Sync.User.login(`http://${server.address}`, credentials);
        console.log(`Congratulations! You've logged in successfully! You Realm Sync UserId is ${user.identity}`)
    } catch (err) {
        console.error(`Error starting Realm Object Server: ${err.message}`)
    }
}

start();