Initial commit: saint-malo navigation quiz

server.js

@@ -0,0 +1,127 @@
+const express = require('express');
+const https = require('https');
+const path = require('path');
+const fs = require('fs');
+
+const app = express();
+app.use(express.json());
+app.use(express.static(path.join(__dirname, 'public')));
+
+const POINTS_FILE = path.join(__dirname, 'data', 'points.json');
+const TILES_DIR = path.join(__dirname, 'tiles');
+
+const SHOM_BASE = 'https://services.data.shom.fr/clevisu/wmts?layer=RASTER_MARINE_3857_WMTS&style=normal&tilematrixset=3857&Service=WMTS&Request=GetTile&Version=1.0.0&Format=image%2Fpng';
+const SHOM_HEADERS = {
+  'Referer': 'https://data.shom.fr',
+  'Origin': 'https://data.shom.fr',
+  'User-Agent': 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/114.0',
+  'Accept': 'image/png'
+};
+
+let db = null;
+let mbtilesMeta = {};
+let tileStmt = null;
+
+async function initMbtiles() {
+  try {
+    const files = fs.readdirSync(TILES_DIR).filter(f => f.endsWith('.mbtiles'));
+    if (files.length === 0) return;
+    const initSqlJs = require('sql.js');
+    const SQL = await initSqlJs();
+    const buf = fs.readFileSync(path.join(TILES_DIR, files[0]));
+    db = new SQL.Database(buf);
+    db.each('SELECT name, value FROM metadata', [], (row) => {
+      mbtilesMeta[row.name] = row.value;
+    });
+    tileStmt = db.prepare(
+      'SELECT tile_data FROM tiles WHERE zoom_level=? AND tile_column=? AND tile_row=?'
+    );
+    console.log(`✓ MBTiles : ${files[0]} (zoom ${mbtilesMeta.minzoom}–${mbtilesMeta.maxzoom})`);
+  } catch (e) {
+    console.log('Pas de MBTiles local, utilisation du flux SHOM en ligne.');
+  }
+}
+
+function proxyShom(z, x, y, res) {
+  const url = `${SHOM_BASE}&TileMatrix=${z}&TileCol=${x}&TileRow=${y}`;
+  https.get(url, { headers: SHOM_HEADERS }, (upstream) => {
+    if (upstream.statusCode !== 200) return res.status(upstream.statusCode).end();
+    res.set('Content-Type', 'image/png');
+    res.set('Cache-Control', 'public, max-age=86400');
+    upstream.pipe(res);
+  }).on('error', () => res.status(502).end());
+}
+
+initMbtiles().then(startServer);
+
+app.get('/api/status', (req, res) => {
+  res.json({
+    hasMbtiles: !!db,
+    name: mbtilesMeta.name || null,
+    minZoom: parseInt(mbtilesMeta.minzoom) || 6,
+    maxZoom: parseInt(mbtilesMeta.maxzoom) || 17
+  });
+});
+
+app.get('/tiles/:z/:x/:y', (req, res) => {
+  const z = parseInt(req.params.z);
+  const x = parseInt(req.params.x);
+  const y = parseInt(req.params.y);
+
+  if (tileStmt) {
+    const tmsY = (1 << z) - 1 - y;
+    try {
+      tileStmt.bind([z, x, tmsY]);
+      if (!tileStmt.step()) { tileStmt.reset(); return proxyShom(z, x, y, res); }
+      const row = tileStmt.getAsObject();
+      tileStmt.reset();
+      const fmt = mbtilesMeta.format || 'png';
+      res.set('Content-Type', fmt === 'jpg' || fmt === 'jpeg' ? 'image/jpeg' : 'image/png');
+      res.set('Cache-Control', 'public, max-age=86400');
+      res.send(Buffer.from(row.tile_data));
+    } catch (e) {
+      tileStmt.reset();
+      proxyShom(z, x, y, res);
+    }
+  } else {
+    proxyShom(z, x, y, res);
+  }
+});
+
+function loadPoints() {
+  if (!fs.existsSync(POINTS_FILE)) return [];
+  try { return JSON.parse(fs.readFileSync(POINTS_FILE, 'utf8')); }
+  catch { return []; }
+}
+
+function savePoints(pts) {
+  fs.writeFileSync(POINTS_FILE, JSON.stringify(pts, null, 2));
+}
+
+app.get('/api/points', (req, res) => res.json(loadPoints()));
+
+app.post('/api/points', (req, res) => {
+  const pts = loadPoints();
+  const pt = { id: `${Date.now()}-${Math.random().toString(36).slice(2, 7)}`, ...req.body };
+  pts.push(pt);
+  savePoints(pts);
+  res.json(pt);
+});
+
+app.put('/api/points/:id', (req, res) => {
+  const pts = loadPoints();
+  const i = pts.findIndex(p => p.id === req.params.id);
+  if (i === -1) return res.status(404).json({ error: 'Not found' });
+  pts[i] = { ...pts[i], ...req.body };
+  savePoints(pts);
+  res.json(pts[i]);
+});
+
+app.delete('/api/points/:id', (req, res) => {
+  savePoints(loadPoints().filter(p => p.id !== req.params.id));
+  res.json({ ok: true });
+});
+
+function startServer() {
+  app.listen(4242, () => console.log('\n⚓  Saint-Malo Quiz → http://localhost:4242\n'));
+}