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whoami

Fredrik Liljegren @fiddur

auth0logo Auth0

Note: Conveniently linked…

Webtask.io

  • (JS) Function as a Service
  • Trigger on HTTP(S) or cron

(by Auth0)

Serverless Apps

  • On Github pages
  • …or on lousy hosting
  • …or just because it's "serverless"!

Note: Github pages, SOME sugar

Just a quick example

Example: fitbitCadence

A static HTML using three tasks as backend.

<a onclick="awaitLogin()" 
   href="https://webtask.it.aut … /authenticateFitbit"
   target="_blank">
  Login…
</a>

Implementing fitbit authentication by opening one webtask…

authenticateFitbit

Redirect to webtask, authenticate user, get JWT back.

Finishes by rendering a page:

<html><head></head><body><script>
  window.opener.postMessage("${userJwt}", "*")
  window.close()
</script></body></html>

receivePush

Receives new fitbit entries, stores them in a free cloud mongodb.

const app = require('express')()
app.use(require('body-parser').json())
app.post('/', (req, res) => {...})
app.get('/', (req, res) => {...})

module.exports = (context, req, res) => {
  return require('webtask-tools').fromExpress(app)(context, req, res)
}

Note: More power with express app. Simpler today?

cadence

module.exports = (ctx, done) => {
  // Verify and decode jwt.
  const userData = jwt.verify(
    ctx.query.user, ctx.secrets.JWT_SECRET
  )

  // Fetch runs from storage.
  MongoClient.connect(ctx.secrets.MONGO_URL)
    .then(db => db
            .collection('users')
            .findOne({fitbitId: userData.sub}))
    .then(user => done(null, {runs: user.runsByDate}))
    .catch(err => done(err))
}

Let's try it on http://fiddur.github.io/fitbitCadence/

and the webtask editor

Note: Demo webtask editor

Service extensions

Note: E.g. discount hooks

Slash Webtask

Note:

For anything, convenience shortcut

Demo /wt