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German KhokhlovandClaude Opus 5.5
c18af6ad1c
Tiles a camera move leaves behind keep downloading after the client drops them; the cap bounds their memory and quota, as main's proxy did. Co-Authored-By: Claude Opus 5.5 <[email protected]>
106 lines
3.6 KiB
JavaScript
106 lines
3.6 KiB
JavaScript
import { sameSiteGated } from './common/same-site.js';
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import { makeRateLimiter, clientKey } from './common/rate-limit.js';
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import {
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fetchTile,
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mapillaryToken,
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parseTilePath,
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TileUpstreamError,
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} from './mapillary/tiles.js';
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/**
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* Tile requests per client IP per minute, cache hits included: over 60 new
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* 9-tile views a minute, more than a person flying the camera reaches.
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*/
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export const TILE_ROUTE_MAX_PER_MIN = 600;
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/** The longest upstream Retry-After passed on, in seconds. */
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const MAX_RETRY_AFTER_SEC = 600;
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function sendJson(res, status, payload) {
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res.statusCode = status;
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res.setHeader('Content-Type', 'application/json; charset=utf-8');
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res.setHeader('Cache-Control', 'no-store');
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res.end(JSON.stringify(payload));
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}
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/** GET /api/mapillary/status — whether a token is configured, never its value. */
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function handleStatus(req, res) {
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if (req.method !== 'GET')
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return sendJson(res, 405, { error: 'Method not allowed' });
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sendJson(res, 200, { configured: Boolean(mapillaryToken()) });
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}
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/** GET /api/mapillary/tiles/coverage/{z}/{x}/{y} — trimmed protobuf tile. */
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async function handleTile(req, res, allow) {
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if (req.method !== 'GET')
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return sendJson(res, 405, { error: 'Method not allowed' });
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if (!allow(clientKey(req))) {
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res.setHeader('Retry-After', '5');
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return sendJson(res, 429, {
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error: 'Too many tile requests',
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retryAfter: 5,
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});
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}
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const address = parseTilePath((req.url || '').split('?')[0]);
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if (!address)
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return sendJson(res, 400, {
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error: 'Tile path must be /coverage/{z}/{x}/{y} with z 11–14',
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});
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if (!mapillaryToken())
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return sendJson(res, 503, { error: 'no_key', keyRequired: true });
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try {
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const { bytes, source } = await fetchTile(address);
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res.statusCode = bytes.length ? 200 : 204;
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res.setHeader('Content-Type', 'application/x-protobuf');
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res.setHeader('Cache-Control', 'public, max-age=3600');
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res.setHeader('X-Gev-Cache', source);
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res.end(bytes.length ? bytes : undefined);
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} catch (error) {
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const status = error instanceof TileUpstreamError ? error.status : 0;
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// A rejected token is a key problem the panel can name, not a fault.
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if (status === 401 || status === 403)
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return sendJson(res, 403, {
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error: 'Mapillary rejected the access token',
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keyRejected: true,
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});
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if (status === 429) {
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const sent = Number(error.retryAfter);
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const retryAfter =
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Number.isInteger(sent) && sent > 0
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? Math.min(sent, MAX_RETRY_AFTER_SEC)
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: 60;
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res.setHeader('Retry-After', String(retryAfter));
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return sendJson(res, 429, {
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error: 'Mapillary is rate-limiting tile requests',
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retryAfter,
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});
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}
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// An upstream 400 must not read as a malformed request to this proxy.
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sendJson(res, 502, { error: error?.message || 'Tile fetch failed' });
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}
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}
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/**
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* Vite plugin: Mapillary coverage tiles with the token added server-side, and
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* a status route. Both refuse cross-site requests so another page cannot
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* spend the token.
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*/
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export function mapillaryProxy() {
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const install = (middlewares) => {
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const allow = makeRateLimiter({
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windowMs: 60_000,
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max: TILE_ROUTE_MAX_PER_MIN,
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globalMax: TILE_ROUTE_MAX_PER_MIN * 4,
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});
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middlewares.use('/api/mapillary/status', sameSiteGated(handleStatus));
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middlewares.use(
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'/api/mapillary/tiles',
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sameSiteGated((req, res) => handleTile(req, res, allow)),
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);
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};
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return {
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name: 'mapillary-proxy',
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configureServer: (server) => install(server.middlewares),
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configurePreviewServer: (server) => install(server.middlewares),
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};
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}
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