35 lines
1.1 KiB
JavaScript
35 lines
1.1 KiB
JavaScript
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'use strict';
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const ONE_YEAR_IN_SECONDS = 31536000; // ttl in cache provider
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const FIVE_MINUTES_IN_SECONDS = 60 * 5; // ttl in cache provider
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const defaultCacheTTL = {
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ttl: ONE_YEAR_IN_SECONDS,
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fallbackTtl: FIVE_MINUTES_IN_SECONDS
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};
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const cacheControl = Object.assign(defaultCacheTTL, global.settings.cache);
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module.exports = function cacheControlHeader () {
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return function cacheControlHeaderMiddleware (req, res, next) {
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const { cachePolicy } = res.locals.params;
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const { affectedTables, mayWrite } = res.locals;
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if (cachePolicy === 'persist') {
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res.header('Cache-Control', `public,max-age=${ONE_YEAR_IN_SECONDS}`);
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return next();
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}
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if (affectedTables && affectedTables.getTables().every(table => table.updated_at !== null)) {
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const maxAge = mayWrite ? 0 : cacheControl.ttl;
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res.header('Cache-Control', `no-cache,max-age=${maxAge},must-revalidate,public`);
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return next();
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}
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const maxAge = cacheControl.fallbackTtl;
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res.header('Cache-Control', `no-cache,max-age=${maxAge},must-revalidate,public`);
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return next();
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};
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};
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