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93c6abcad5
closes TryGhost/Team#2094 This value can be used for non-crucial data with a `public` option. For example: `public, max-age=1, stale-while-revalidate=9`. The idea behind this option is that the browser would cache the value for the number of seconds in `max-age` and would use it for the number of seconds in `stale-while-revalidate` until it gets a "validated response" from the server. The behaviour should be almost unnoticeable for the end user but would make a big difference in the amount of requests to server.
52 lines
1.7 KiB
JavaScript
52 lines
1.7 KiB
JavaScript
// # CacheControl Middleware
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// Usage: cacheControl(profile), where profile is one of 'public' or 'private'
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// After: checkIsPrivate
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// Before: routes
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// App: Admin|Site|API
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//
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// Allows each app to declare its own default caching rules
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const isString = require('lodash/isString');
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/**
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* @param {'public'|'private'} profile Use "private" if you do not want caching
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* @param {object} [options]
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* @param {number} [options.maxAge] The max-age in seconds to use when profile is "public"
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* @param {number} [options.staleWhileRevalidate] The stale-while-revalidate in seconds to use when profile is "public"
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*/
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const cacheControl = (profile, options = {maxAge: 0}) => {
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const isOptionHasProperty = property => Object.prototype.hasOwnProperty.call(options, property);
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const publicOptions = [
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'public',
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`max-age=${options.maxAge}`,
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isOptionHasProperty('staleWhileRevalidate') ? `stale-while-revalidate=${options.staleWhileRevalidate}` : ''
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];
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const profiles = {
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public: publicOptions.filter(option => option).join(', '),
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private: 'no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0'
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};
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let output;
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if (isString(profile) && Object.prototype.hasOwnProperty.call(profiles, profile)) {
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output = profiles[profile];
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}
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/**
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* @param {import('express').Request} req
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* @param {import('express').Response} res
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* @param {() => void} next
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*
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* @returns {void}
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*/
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return function cacheControlHeaders(req, res, next) {
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if (output) {
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res.set({'Cache-Control': output});
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}
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next();
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};
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};
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module.exports = cacheControl;
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