17 lines
582 B
JavaScript
17 lines
582 B
JavaScript
import { setFastlySurrogateKey, SURROGATE_ENUMS } from './set-fastly-surrogate-key.js'
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export default function setStaticAssetCaching(req, res, next) {
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if (isChecksummed(req.path)) {
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setFastlySurrogateKey(res, SURROGATE_ENUMS.MANUAL)
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}
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return next()
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}
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// True if the URL is known to contain some pattern of a checksum that
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// would make it intelligently different if its content has changed.
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function isChecksummed(path) {
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if (path.startsWith('/assets/cb-')) return true
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if (path.startsWith('/_next/static') && /[a-f0-9]{20}/.test(path)) return true
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return false
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}
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