gecko-dev/dom/base/test/unit/test_structuredcloneholder.js

"use strict";

ChromeUtils.import("resource://gre/modules/Services.jsm");

const global = this;

add_task(async function test_structuredCloneHolder() {
  let principal = Services.scriptSecurityManager.createCodebasePrincipal(
    Services.io.newURI("http://example.com/"), {});

  let sandbox = Cu.Sandbox(principal);

  const obj = {foo: [{bar: "baz"}]};

  let holder = new StructuredCloneHolder(obj);


  // Test same-compartment deserialization

  let res = holder.deserialize(global);

  notEqual(res, obj, "Deserialized result is a different object from the original");

  deepEqual(res, obj, "Deserialized result is deeply equivalent to the original");

  equal(Cu.getObjectPrincipal(res), Cu.getObjectPrincipal(global),
        "Deserialized result has the correct principal");


  // Test non-object-value round-trip.

  equal(new StructuredCloneHolder("foo").deserialize(global), "foo",
        "Round-tripping non-object values works as expected");


  // Test cross-compartment deserialization

  res = holder.deserialize(sandbox);

  notEqual(res, obj, "Cross-compartment-deserialized result is a different object from the original");

  deepEqual(res, obj, "Cross-compartment-deserialized result is deeply equivalent to the original");

  equal(Cu.getObjectPrincipal(res), principal,
        "Cross-compartment-deserialized result has the correct principal");


  // Test message manager transportability

  const MSG = "StructuredCloneHolder";

  let resultPromise = new Promise(resolve => {
    Services.ppmm.addMessageListener(MSG, resolve);
  });

  Services.cpmm.sendAsyncMessage(MSG, holder);

  res = await resultPromise;

  ok(res.data instanceof StructuredCloneHolder,
     "Sending structured clone holders through message managers works as expected");

  deepEqual(res.data.deserialize(global), obj,
            "Sending structured clone holders through message managers works as expected");
});

// Test that X-rays passed to an exported function are serialized
// through their exported wrappers.
add_task(async function test_structuredCloneHolder_xray() {
  let principal = Services.scriptSecurityManager.createCodebasePrincipal(
    Services.io.newURI("http://example.com/"), {});

  let sandbox1 = Cu.Sandbox(principal, {wantXrays: true});

  let sandbox2 = Cu.Sandbox(principal, {wantXrays: true});
  Cu.evalInSandbox(`this.x = {y: "z", get z() { return "q" }}`, sandbox2);

  sandbox1.x = sandbox2.x;

  let holder;
  Cu.exportFunction(function serialize(val) {
    holder = new StructuredCloneHolder(val, sandbox1);
  }, sandbox1, {defineAs: "serialize"});

  Cu.evalInSandbox(`serialize(x)`, sandbox1);

  const obj = {y: "z"};

  let res = holder.deserialize(global);

  deepEqual(res, obj, "Deserialized result is deeply equivalent to the expected object");
  deepEqual(res, sandbox2.x, "Deserialized result is deeply equivalent to the X-ray-wrapped object");

  equal(Cu.getObjectPrincipal(res), Cu.getObjectPrincipal(global),
        "Deserialized result has the correct principal");
});