75 lines
2.0 KiB
TypeScript
75 lines
2.0 KiB
TypeScript
/**
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* Tileserver
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* - routes for Express app
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* - see rendererDefinition for actual rules of rendering
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*/
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import express from 'express';
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import asyncController from '../api/routes/asyncController';
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import { strictParseInt } from '../parse';
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import { allTilesets, renderTile } from './rendererDefinition';
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import { TileParams } from './types';
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const handleTileRequest = asyncController(async function (req: express.Request, res: express.Response) {
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try {
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var tileParams = parseTileParams(req.params);
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var dataParams = req.query;
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} catch(err) {
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console.error(err);
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return res.status(400).send({error: err.message});
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}
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try {
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const im = await renderTile(tileParams, dataParams);
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res.writeHead(200, { 'Content-Type': 'image/png' });
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res.end(im);
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} catch(err) {
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console.error(err);
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res.status(500).send({ error: err });
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}
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});
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// tiles router
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const router = express.Router();
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router.get('/:tileset/:z/:x/:y(\\d+):scale(@\\dx)?.png', handleTileRequest);
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function parseTileParams(params: any): TileParams {
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const { tileset, z, x, y, scale } = params;
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if (!allTilesets.includes(tileset)) throw new Error('Invalid value for tileset: ' + tileset);
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const intZ = strictParseInt(z);
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if (isNaN(intZ)) throw new Error('Invalid value for z: ' + intZ);
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const intX = strictParseInt(x);
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if (isNaN(intX)) throw new Error('Invalid value for x: ' + intX);
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const intY = strictParseInt(y);
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if (isNaN(intY)) throw new Error('Invalid value for y: ' + intY);
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let intScale: number;
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if (scale === '@2x') {
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intScale = 2;
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} else if (scale === '@1x' || scale == undefined) {
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intScale = 1;
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} else {
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throw new Error('Invalid value for scale');
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}
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return {
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tileset,
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z: intZ,
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x: intX,
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y: intY,
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scale: intScale
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};
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}
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router.use((req, res) => {
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return res.status(404).send('Tile not found');
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});
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export default router;
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