franzwong

const F = require('fluture')
const {create, env} = require ('sanctuary');
const {env: flutureEnv} = require ('fluture-sanctuary-types');

const S = create ({checkTypes: true, env: env.concat (flutureEnv)});

const getName = id => new Promise(resolve => {
  console.log(id)
  setTimeout(() => resolve('Franz'), 3000)
})

franzwong

const R = require('ramda')

function quicksort(list) {
  return R.ifElse(
    R.pipe(R.length, R.gt(2)),
    R.identity,
    list => {
      const [pivot, ...rest] = list
      return R.pipe(
        R.partition(R.gt(pivot)),

franzwong

events {}

http {
  upstream webapp {
    server host.docker.internal:3000; # development only
  }

  server {
    listen 80;
    server_name localhost;

franzwong

// For simplicity, error handling is not included
const axios = require('axios')
const AWS = require('aws-sdk');

const region = process.env['AwsRegion']
AWS.config.update({region});

const url = process.env['ExchangeRateURL']

const bucket = process.env['S3Bucket']

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AWSTemplateFormatVersion: 2010-09-09
Parameters:
  AwsRegion:
    Type: String
    Default: us-east-1
  # This bucket stores the lambda function package
  LambdaCodeBucket:
    Type: String
    Default: my-lambda
  LambdaCodeKey:

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async function signUp(email, password) {
  try {
    const cognito = new AWS.CognitoIdentityServiceProvider()
    await cognito.adminCreateUser({
      UserPoolId: process.env.USER_POOL_ID,
      Username: email,
      MessageAction: 'SUPPRESS',
      TemporaryPassword: password,
    }).promise()

franzwong

async function login(email, password) {
  try {
    const cognito = new AWS.CognitoIdentityServiceProvider()
    return await cognito.adminInitiateAuth({
      AuthFlow: 'ADMIN_NO_SRP_AUTH',
      ClientId: process.env.CLIENT_ID,
      UserPoolId: process.env.USER_POOL_ID,
      AuthParameters: {
        USERNAME: email,
        PASSWORD: password

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{
  "Version": "2012-10-17",
  "Statement": [{
    "Effect": "Allow",
    "Principal": {"Federated": "cognito-identity.amazonaws.com"},
    "Action": "sts:AssumeRoleWithWebIdentity",
    "Condition": {
      "StringEquals": {"cognito-identity.amazonaws.com:aud": "<IDENTITY_POOL_ID>"},
      "ForAnyValue:StringLike": {"cognito-identity.amazonaws.com:amr": "authenticated"}
    }

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{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:PutObject",
        "s3:DeleteObject"
      ],

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async function getUserCredentials(idToken) {
  const cognitoidentity = new AWS.CognitoIdentity()

  const providerName = `cognito-idp.${process.env.AWS_REGION}.amazonaws.com/${process.env.USER_POOL_ID}`
  let response = await cognitoidentity.getId({
    IdentityPoolId: process.env.IDENTITY_POOL_ID,
    Logins: {
      [providerName]: idToken
    }
  }).promise()