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Auth with headers

Allow or deny a request based on a known pre-shared key in a header. This is not meant to replace the WebCrypto API.

/**
* @param {string} PRESHARED_AUTH_HEADER_KEY Custom header to check for key
* @param {string} PRESHARED_AUTH_HEADER_VALUE Hard coded key value
*/
const PRESHARED_AUTH_HEADER_KEY = "X-Custom-PSK"
const PRESHARED_AUTH_HEADER_VALUE = "mypresharedkey"
async function handleRequest(request) {
const psk = request.headers.get(PRESHARED_AUTH_HEADER_KEY)
if (psk === PRESHARED_AUTH_HEADER_VALUE) {
// Correct preshared header key supplied. Fetch request from origin.
return fetch(request)
}
// Incorrect key supplied. Reject the request.
return new Response("Sorry, you have supplied an invalid key.", {
status: 403,
})
}
addEventListener("fetch", event => {
event.respondWith(handleRequest(event.request))
})