58 lines
1.5 KiB
JavaScript
58 lines
1.5 KiB
JavaScript
const express = require("express");
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const Database = require("better-sqlite3");
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const path = require("path");
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const router = express.Router();
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const mbtilesPath = path.join(__dirname, "..", "data", "raster.mbtiles");
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const tileDb = new Database(mbtilesPath, { readonly: true });
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const metadataRows = tileDb.prepare("SELECT name, value FROM metadata").all();
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const metadata = {};
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for (const row of metadataRows) {
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metadata[row.name] = row.value;
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}
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let contentType = "application/octet-stream";
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if (metadata.format === "png") {
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contentType = "image/png";
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} else if (metadata.format === "jpg" || metadata.format === "jpeg") {
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contentType = "image/jpeg";
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} else if (metadata.format === "webp") {
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contentType = "image/webp";
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}
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router.get("/metadata/info", (req, res) => {
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res.json(metadata);
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});
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router.get("/:z/:x/:y", (req, res) => {
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const z = Number(req.params.z);
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const x = Number(req.params.x);
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const y = Number(req.params.y);
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if (!Number.isInteger(z) || !Number.isInteger(x) || !Number.isInteger(y)) {
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return res.status(400).json({ error: "Invalid tile coordinates" });
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}
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const tmsY = (1 << z) - 1 - y;
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const tile = tileDb.prepare(`
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SELECT tile_data
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FROM tiles
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WHERE zoom_level = ?
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AND tile_column = ?
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AND tile_row = ?
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`).get(z, x, tmsY);
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if (!tile) {
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return res.status(404).json({ error: "Tile not found" });
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}
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res.setHeader("Content-Type", contentType);
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res.send(tile.tile_data);
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});
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module.exports = router;
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