Artsy Xapp Middleware
Node middleware that fetches an xapp token from Artsy, stores it in res.locals, and expires it.
Use like so...
app.use require('artsy-xapp-middlware')
artsyUrl: 'http://artsy.net'
clientId: '133fsa3'
clientSecret: 'f32j13f'
app.get '/', (req, res) ->
res.send "This app's XAPP token " + res.locals.artsyXappToken