wmts-to-mbtiles/tools/preview-server.js

Save tiles from WMTS service to MBTiles format

#!/usr/bin/env node

const express = require('express')
const path = require('path')
const MBTiles = require('@mapbox/mbtiles')

const app = express()

const fileArg = process.argv[2] || 'output.mbtiles'
const file = path.resolve(path.join(__dirname, '../'), fileArg)
const port = 5566
let tiles = null

new MBTiles(file, (err, db) => {
  if (err) {
    console.log('Unable to open charts file: ', file)
    console.error(err)
    process.exit(-1)
  } else {
    db.getInfo(function(err, info) {
      if (err) {
        console.error(err)
        process.exit(-1)
      }
      console.log(info)
      tiles = db
    })
  }
})

app.get('/:z/:x/:y', (req, res) => {
  const {z, x, y} = req.params
  if (!tiles) {
    res.sendStatus(500)
    return
  }
  tiles.getTile(z, x, y, (err, tile, headers) => {
    if (err && err.message && err.message === 'Tile does not exist') {
      res.sendStatus(404)
    } else if (err) {
      console.error(`Error fetching tile ${z}/${x}/${y}:`, err)
      res.sendStatus(500)
    } else {
      res.writeHead(200, headers)
      res.end(tile)
    }
  })
})

app.use('/', express.static(__dirname))

app.listen(port, () => {
  console.log(`Listening ${port} and serving ${file}`)
  console.log(`Open http://localhost:${port}/`)
})