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// Return a function you can pass a Response object to and it will

// set the `Cache-Control` header.

// For example:

// const cacheControlYear = getCacheControl(60 * 60 * 24 * 365)

// ...

// cacheControlYear(res)

// res.send(body)

// Or, if you want to make it definitely not cache:

// const noCacheControl = getCacheControl(0) // you can use `false` too

// ...

// noControlYear(res)

// res.send(body)

export function cacheControlFactory(maxAge = 60 * 60, { public_ = true, immutable = false } = {}) {

return (res) => {

const directives = []

if (maxAge) {

if (public_) directives.push('public')

directives.push(`max-age=${maxAge}`)

if (immutable) directives.push('immutable')

} else {

directives.push('private')

directives.push('no-store')

}

res.set('cache-control', directives.join(', '))

}