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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
let knownConfigs = new Map();
export class HPKEConfigManager {
static async get(aURL, aOptions = {}) {
try {
let config = await this.#getInternal(aURL, aOptions);
return new Uint8Array(config);
} catch (ex) {
console.error(ex);
return null;
}
}
static async #getInternal(aURL, aOptions = {}) {
let { maxAge = -1 } = aOptions;
let knownConfig = knownConfigs.get(aURL);
if (
knownConfig &&
(maxAge < 0 || Date.now() - knownConfig.fetchDate < maxAge)
) {
return knownConfig.config;
}
return this.fetchAndStore(aURL, aOptions);
}
static async fetchAndStore(aURL, aOptions = {}) {
let fetchDate = Date.now();
let resp = await fetch(aURL, { signal: aOptions.abortSignal });
if (!resp?.ok) {
throw new Error(
`Fetching HPKE config from ${aURL} failed with error ${resp.status}`
);
}
let config = await resp.blob().then(b => b.arrayBuffer());
knownConfigs.set(aURL, { config, fetchDate });
return config;
}
}
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