forked from mirrors/gecko-dev
51 lines
1.6 KiB
JavaScript
51 lines
1.6 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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/* global MPShowMessage, MPIsEnabled, MPShouldShowHint */
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"use strict";
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// decode a 16-bit string in which only one byte of each
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// 16-bit unit is occupied, to UTF-8. This is necessary to
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// comply with `btoa` API constraints.
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function fromBinary(encoded) {
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const binary = atob(decodeURIComponent(encoded));
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const bytes = new Uint8Array(binary.length);
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for (let i = 0; i < bytes.length; i++) {
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bytes[i] = binary.charCodeAt(i);
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}
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return String.fromCharCode(...new Uint16Array(bytes.buffer));
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}
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function decodeMessageFromUrl() {
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const url = new URL(document.location.href);
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if (url.searchParams.has("json")) {
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const encodedMessage = url.searchParams.get("json");
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return fromBinary(encodedMessage);
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}
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return null;
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}
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function showHint() {
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document.body.classList.add("hint-box");
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document.body.innerHTML = `<div class="hint">Message preview is not enabled. Enable it in about:config by setting <code>browser.newtabpage.activity-stream.asrouter.devtoolsEnabled</code> to true.</div>`;
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}
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const message = decodeMessageFromUrl();
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if (message) {
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// If message preview is enabled, show the message.
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if (MPIsEnabled()) {
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MPShowMessage(message);
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} else if (MPShouldShowHint()) {
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// If running in a local build, show a hint about how to enable preview.
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if (document.body) {
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showHint();
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} else {
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document.addEventListener("DOMContentLoaded", showHint, { once: true });
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}
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}
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}
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