52 lines
1.6 KiB
JavaScript
52 lines
1.6 KiB
JavaScript
'use strict';
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const ONE_YEAR_IN_SECONDS = 60 * 60 * 24 * 365;
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const FIVE_MINUTES_IN_SECONDS = 60 * 5;
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const FALLBACK_TTL = global.environment.varnish.fallbackTtl || FIVE_MINUTES_IN_SECONDS;
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module.exports = function setCacheControlHeader ({
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ttl = ONE_YEAR_IN_SECONDS,
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fallbackTtl = FALLBACK_TTL,
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revalidate = false
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} = {}) {
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return function setCacheControlHeaderMiddleware (req, res, next) {
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if (req.method !== 'GET') {
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return next();
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}
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const { mapConfigProvider = { getAffectedTables: callback => callback() } } = res.locals;
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mapConfigProvider.getAffectedTables((err, affectedTables) => {
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if (err) {
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global.logger.warn('ERROR generating Cache Control Header:', err);
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return next();
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}
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const directives = [ 'public' ];
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if (everyAffectedTableCanBeInvalidated(affectedTables)) {
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directives.push(`max-age=${ttl}`);
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} else {
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directives.push(`max-age=${fallbackTtl}`);
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}
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if (revalidate) {
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directives.push('must-revalidate');
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}
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res.set('Cache-Control', directives.join(','));
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next();
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});
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};
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};
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function everyAffectedTableCanBeInvalidated (affectedTables) {
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const skipNotUpdatedAtTables = false;
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const skipAnalysisCachedTables = true;
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return affectedTables &&
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affectedTables.getTables(skipNotUpdatedAtTables, skipAnalysisCachedTables)
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.every(table => table.updated_at !== null);
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}
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