feat: Check for body size limitation when requesting the capture endp…

…oint (close #1)

index.js

@@ -7,8 +7,9 @@ import { capture } from './capture.js'
 import geojsonhint from '@mapbox/geojsonhint'
 
 const port = process.env.PORT || 3000
-const url = process.env.KANO_URL
-const jwt = process.env.KANO_JWT
+const kanoUrl = process.env.KANO_URL
+const kanoJwt = process.env.KANO_JWT
+const bodyLimit = process.env.BODY_LIMIT || '100kb'
 
 // features validator middleware
 const geoJsonValidator = function (req, res, next) {
@@ -27,14 +28,14 @@ const geoJsonValidator = function (req, res, next) {
 // Initialize express app
 const app = express()
 app.use(cors()) // enable cors
-app.use(express.urlencoded({extended: true}))
-app.use(express.json())
+app.use(express.urlencoded({limit: bodyLimit, extended: true}))
+app.use(express.json({limit: bodyLimit}))
 app.use(geoJsonValidator)
 
 // Capture 
 app.post('/capture', async (req, res) => {
   let start = new Date()
-  const buffer = await capture(Object.assign(req.body, { url, jwt }))
+  const buffer = await capture(Object.assign(req.body, { url : kanoUrl, jwt: kanoJwt }))
   if (Buffer.isBuffer(buffer)) {
     res.contentType('image/png')
     res.send(buffer)

test/capture.test.js

@@ -87,13 +87,19 @@ describe(`suite:${suite}`, () => {
     expect(match('layers')).to.be.true
   })
 
-  it('capture geojson file', async () => {
+  it('capture heterogenous geojson file', async () => {
     const body = JSON.parse(fs.readFileSync(path.join(dataDir, 'shapes.geojson')))
     const res = await capture(body, 'shapes')
     expect(res.status).to.equal(200)
     expect(match('shapes')).to.be.true
   })
 
+  it('handle too large geojson file', async () => {
+    const body = JSON.parse(fs.readFileSync(path.join(dataDir, 'adsb.geojson')))
+    const res = await capture(body, 'adsb')
+    expect(res.status).to.equal(413)
+  })
+
   it('capture gradient geoson file', async () => {
     let body = JSON.parse(fs.readFileSync(path.join(dataDir, 'flight.geojson')))
     body.layers = ['layers-osm-dark']