75 lines
2.3 KiB
JavaScript
75 lines
2.3 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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let knownConfigs = new Map();
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export class HPKEConfigManager {
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/**
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* Decodes a base64url-encoded key string.
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* @param {string} aBase64Key
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* @returns {Uint8Array}
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*/
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static decodeKey(aBase64Key) {
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return new Uint8Array(
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ChromeUtils.base64URLDecode(aBase64Key, { padding: "ignore" })
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);
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}
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static async get(aURL, aOptions = {}) {
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// If we're in a child, forward to the parent.
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let { remoteType } = Services.appinfo;
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if (remoteType) {
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if (remoteType != "privilegedabout") {
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// The remoteTypes definition in the actor definition will enforce
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// that calling getActor fails, this is a more readable error:
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throw new Error(
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"HPKEConfigManager cannot be used outside of the privilegedabout process."
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);
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}
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let actor = ChromeUtils.domProcessChild.getActor("HPKEConfigManager");
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return actor.sendQuery("getconfig", { url: aURL, options: aOptions });
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}
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try {
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let config = await this.#getInternal(aURL, aOptions);
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return new Uint8Array(config);
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} catch (ex) {
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console.error(ex);
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return null;
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}
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}
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static async #getInternal(aURL, aOptions = {}) {
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let { maxAge = -1 } = aOptions;
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let knownConfig = knownConfigs.get(aURL);
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if (
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knownConfig &&
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(maxAge < 0 || Date.now() - knownConfig.fetchDate < maxAge)
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) {
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return knownConfig.config;
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}
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return this.#fetchAndStore(aURL, aOptions);
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}
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static async #fetchAndStore(aURL, aOptions = {}) {
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let fetchDate = Date.now();
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let resp = await fetch(aURL, { signal: aOptions.abortSignal });
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if (!resp?.ok) {
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throw new Error(
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`Fetching HPKE config from ${aURL} failed with error ${resp.status}`
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);
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}
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let config = await resp.blob().then(b => b.arrayBuffer());
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knownConfigs.set(aURL, { config, fetchDate });
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return config;
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}
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}
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export class HPKEConfigManagerParent extends JSProcessActorParent {
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receiveMessage(msg) {
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if (msg.name == "getconfig") {
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return HPKEConfigManager.get(msg.data.url, msg.data.options);
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}
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return null;
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}
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}
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