зеркало из https://github.com/mozilla/gecko-dev.git
59 строки
2.0 KiB
JavaScript
59 строки
2.0 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* Common logic shared by RemoteSettingsWorker.js (Worker) and the main thread.
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*/
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var EXPORTED_SYMBOLS = ["SharedUtils"];
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// Import globals that are available by default in workers but not in JSMs.
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if (typeof crypto == "undefined") {
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Cu.importGlobalProperties(["fetch", "crypto"]);
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}
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var SharedUtils = {
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/**
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* Check that the specified content matches the expected size and SHA-256 hash.
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* @param {ArrayBuffer} buffer binary content
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* @param {Number} size expected file size
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* @param {String} size expected file SHA-256 as hex string
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* @returns {boolean}
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*/
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async checkContentHash(buffer, size, hash) {
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const bytes = new Uint8Array(buffer);
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// Has expected size? (saves computing hash)
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if (bytes.length !== size) {
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return false;
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}
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// Has expected content?
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const hashBuffer = await crypto.subtle.digest("SHA-256", bytes);
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const hashBytes = new Uint8Array(hashBuffer);
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const toHex = b => b.toString(16).padStart(2, "0");
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const hashStr = Array.from(hashBytes, toHex).join("");
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return hashStr == hash;
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},
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/**
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* Load (from disk) the JSON file distributed with the release for this collection.
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* @param {String} bucket
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* @param {String} collection
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*/
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async loadJSONDump(bucket, collection) {
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// When using the preview bucket, we still want to load the main dump.
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// But we store it locally in the preview bucket.
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const jsonBucket = bucket.replace("-preview", "");
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const fileURI = `resource://app/defaults/settings/${jsonBucket}/${collection}.json`;
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let response;
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try {
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response = await fetch(fileURI);
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} catch (e) {
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// Return null if file is missing.
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return { data: null };
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}
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// Will throw if JSON is invalid.
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return response.json();
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},
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};
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