browser_policy_container_not_stored.js

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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/. */

"use strict";

/**

 * A session history entry only needs to retain the policy container for loads

 * that inherit their policies (about:blank, about:srcdoc, blob:, data:, ...).

 * Anything fetched over the network gets its policies from the response again,

 * so storing them would only bloat the session store (bug 2011236).

*/

const TEST_ROOT = getRootDirectory(gTestPath).replace(

  "chrome://mochitests/content",

  "https://example.com"

);

const PARENT_URL = TEST_ROOT + "browser_policy_container_sample.html";

const FRAME_URL = TEST_ROOT + "browser_policy_container_sample_frame.html";

add_task(async function test_policy_container_only_for_inheriting_loads() {

  const tab = BrowserTestUtils.addTab(gBrowser, PARENT_URL);

  gBrowser.selectedTab = tab;

  await promiseBrowserLoaded(tab.linkedBrowser, true, PARENT_URL);

  await TabStateFlusher.flush(tab.linkedBrowser);

  const state = JSON.parse(ss.getTabState(tab));

  const topEntry = state.entries.at(-1);

  is(topEntry.url, PARENT_URL, "collected the parent entry");

  const children = topEntry.children ?? [];

  const networkFrame = children.find(child => child.url === FRAME_URL);

  const blankFrame = children.find(child => child.url === "about:blank");

  ok(networkFrame, "collected the network-scheme subframe entry");

  ok(blankFrame, "collected the about:blank subframe entry");

  // The parent has a CSP, so both subframes inherit a policy container onto

  // their load state. Only the one that cannot recover it from a response

  // should keep it in session history.

ok(

    !("policyContainer" in networkFrame),

    "https subframe entry does not store a policyContainer"

);

ok(

    "policyContainer" in blankFrame,

    "about:blank subframe entry still stores its inherited policyContainer"

);

  await BrowserTestUtils.removeTab(tab);

});