/* 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 {
/**
* Decodes a base64url-encoded key string.
* @param {string} aBase64Key
* @returns {Uint8Array}
*/
static decodeKey(aBase64Key) {
return new Uint8Array(
ChromeUtils.base64URLDecode(aBase64Key, { padding: "ignore" })
);
}
static async get(aURL, aOptions = {}) {
// If we're in a child, forward to the parent.
let { remoteType } = Services.appinfo;
if (remoteType) {
if (remoteType != "privilegedabout") {
// The remoteTypes definition in the actor definition will enforce
// that calling getActor fails, this is a more readable error:
throw new Error(
"HPKEConfigManager cannot be used outside of the privilegedabout process."
);
}
let actor = ChromeUtils.domProcessChild.getActor("HPKEConfigManager");
return actor.sendQuery("getconfig", { url: aURL, options: 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;
}
}
export class HPKEConfigManagerParent extends JSProcessActorParent {
receiveMessage(msg) {
if (msg.name == "getconfig") {
return HPKEConfigManager.get(msg.data.url, msg.data.options);
}
return null;
}
}
