[WIP] Custom amplify auth scheme for nuxt/auth (auth.nuxtjs.org).

amplifyauth-scheme.ts

import { Amplify, Auth, withSSRContext } from 'aws-amplify'
import { Auth as NuxtAuth } from '@nuxtjs/auth-next'

export interface AmplifyAuthSchemeOptions {
    name: string
}

export default class AmplifyAuthScheme {
    public $auth: NuxtAuth
    public options: AmplifyAuthSchemeOptions

    constructor($auth: NuxtAuth, options: AmplifyAuthSchemeOptions) {
        this.$auth = $auth
        this.options = options
    }

    _Auth(): typeof Auth {
        return process.server
            ? withSSRContext({ req: this.$auth.ctx.req }).Auth
            : Auth
    }

    async mounted() {
        // https://docs.amplify.aws/lib/auth/getting-started/q/platform/js#configure-your-application
        Amplify.configure({ /* aws config here */ })
        return this.$auth.fetchUserOnce()
    }

    async login({ username, password }:{ username: string, password: string }) {
        try {
            await this.$auth.reset()
            await this._Auth().signIn(username, password)
            return this.$auth.fetchUser()
        } catch (error) {
            this.$auth.callOnError(error, { method: 'login' })
        }
    }

    async fetchUser() {
        try {
            const user = await this._Auth().currentAuthenticatedUser()
            const { attributes } = process.server
                ? await this._Auth().currentUserInfo()
                : user
            this.$auth.setUser(attributes)
            return user
        } catch (error) {
            this.$auth.callOnError(error, { method: 'fetchUser' })
        }
    }

    reset() {
        this.$auth.setUser(false)
    }

    async logout() {
        try {
            await this._Auth().signOut()
            return this.$auth.reset()
        } catch (error) {
            this.$auth.callOnError(error, { method: 'logout' })
        }
    }
}