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