cobalt/worker/dedicated_worker_global_scope.cc

// Copyright 2022 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "cobalt/worker/dedicated_worker_global_scope.h"

#include <string>

#include "cobalt/base/polymorphic_downcast.h"
#include "cobalt/script/environment_settings.h"
#include "cobalt/worker/worker_global_scope.h"
#include "cobalt/worker/worker_settings.h"
#include "url/gurl.h"

namespace cobalt {
namespace worker {
DedicatedWorkerGlobalScope::DedicatedWorkerGlobalScope(
    script::EnvironmentSettings* settings,
    bool parent_cross_origin_isolated_capability)
    : WorkerGlobalScope(settings), cross_origin_isolated_capability_(false) {
  // Algorithm for 'run a worker'
  //   https://html.spec.whatwg.org/commit-snapshots/465a6b672c703054de278b0f8133eb3ad33d93f4/#run-a-worker
  // 14.9. If is shared is false and owner's cross-origin isolated
  //       capability is false, then set worker global scope's cross-origin
  //       isolated capability to false.
  if (!parent_cross_origin_isolated_capability) {
    cross_origin_isolated_capability_ = false;
  }
}

void DedicatedWorkerGlobalScope::Initialize() {
  // Algorithm for 'run a worker'
  //   https://html.spec.whatwg.org/commit-snapshots/465a6b672c703054de278b0f8133eb3ad33d93f4/#run-a-worker
  // 14.4. Initialize worker global scope's policy container given worker
  //       global scope, response, and inside settings.
  InitializePolicyContainer();
  // 14.5. If the Run CSP initialization for a global object algorithm
  //       returns "Blocked" when executed upon worker global scope, set
  //       response to a network error. [CSP]

  // Note: This is a no-op here:
  // The "Run CSP initialization for a global object algorithm"
  //   https://www.w3.org/TR/2023/WD-CSP3-20230110/#run-global-object-csp-initialization
  // Only returns "Blocked" if a "directive’s initialization algorithm on
  // global" returns "Blocked".
  // And "directive’s initialization algorithm on global" is this:
  //   https://www.w3.org/TR/2023/WD-CSP3-20230110/#directive-initialization
  // Unless otherwise specified, it has no effect and it returns "Allowed".

  // 14.6. If worker global scope's embedder policy's value is compatible with
  //       cross-origin isolation and is shared is true, then set agent's agent
  //       cluster's cross-origin isolation mode to "logical" or "concrete".
  //       The one chosen is implementation-defined.
  // No need for dedicated worker.

  // 14.7. If the result of checking a global object's embedder policy with
  //       worker global scope, outside settings, and response is false, then
  //       set response to a network error.
  // Cobalt does not implement embedder policy.
  // 14.8. Set worker global scope's cross-origin isolated capability to true
  //       if agent's agent cluster's cross-origin isolation mode is
  //       "concrete".
  // Cobalt does not implement "concrete" cross-origin isolation mode.

  // 14.10. If is shared is false and response's url's scheme is "data", then
  //        set worker global scope's cross-origin isolated capability to
  //        false.
  if (!Url().SchemeIs("data")) {
    cross_origin_isolated_capability_ = false;
  }
}

void DedicatedWorkerGlobalScope::PostMessage(
    const script::ValueHandleHolder& message) {
  base::polymorphic_downcast<worker::WorkerSettings*>(environment_settings())
      ->message_port()
      ->PostMessage(message);
}

void DedicatedWorkerGlobalScope::InitializePolicyContainer() {
  // Algorithm for Initialize a worker global scope's policy container
  //    https://html.spec.whatwg.org/commit-snapshots/814668ef2d1919a2a9387a0b29ebc6df7748fa80/#initialize-worker-policy-container
  // 1. If workerGlobalScope's url is local but its scheme is not "blob":
  //    URL: https://fetch.spec.whatwg.org/#local-scheme: A local scheme is
  //    "about", "blob", or "data".
  if (Url().SchemeIs(url::kAboutScheme) || Url().SchemeIs(url::kDataScheme)) {
    // 1.1. Assert: workerGlobalScope's owner set's size is 1.
    DCHECK(owner_set()->size() == 1);
    // 1.2. Set workerGlobalScope's policy container to a clone of
    //      workerGlobalScope's owner set[0]'s relevant settings object's
    //      policy container.
    auto* owner = *owner_set()->begin();
    DCHECK(owner->csp_delegate()->GetPolicyContainer());
    csp_delegate()->ClonePolicyContainer(
        *owner->csp_delegate()->GetPolicyContainer());
  }
  // 2. Otherwise, set workerGlobalScope's policy container to the result
  //    of creating a policy container from a fetch response given response
  //    and environment.
}

}  // namespace worker
}  // namespace cobalt