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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/. */
+
+/**
+ * Common logic shared by RemoteSettingsWorker.js (Worker) and the main thread.
+ */
+
+export var SharedUtils = {
+ /**
+ * Check that the specified content matches the expected size and SHA-256 hash.
+ * @param {ArrayBuffer} buffer binary content
+ * @param {Number} size expected file size
+ * @param {String} size expected file SHA-256 as hex string
+ * @returns {boolean}
+ */
+ async checkContentHash(buffer, size, hash) {
+ const bytes = new Uint8Array(buffer);
+ // Has expected size? (saves computing hash)
+ if (bytes.length !== size) {
+ return false;
+ }
+ // Has expected content?
+ const hashBuffer = await crypto.subtle.digest("SHA-256", bytes);
+ const hashBytes = new Uint8Array(hashBuffer);
+ const toHex = b => b.toString(16).padStart(2, "0");
+ const hashStr = Array.from(hashBytes, toHex).join("");
+ return hashStr == hash;
+ },
+
+ /**
+ * Load (from disk) the JSON file distributed with the release for this collection.
+ * @param {String} bucket
+ * @param {String} collection
+ */
+ async loadJSONDump(bucket, collection) {
+ // When using the preview bucket, we still want to load the main dump.
+ // But we store it locally in the preview bucket.
+ const jsonBucket = bucket.replace("-preview", "");
+ const fileURI = `resource://app/defaults/settings/${jsonBucket}/${collection}.json`;
+ let response;
+ try {
+ response = await fetch(fileURI);
+ } catch (e) {
+ // Return null if file is missing.
+ return { data: null, timestamp: null };
+ }
+ // Will throw if JSON is invalid.
+ return response.json();
+ },
+};