// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/shared_worker/shared_worker_service_impl.h"

#include <stddef.h>

#include <algorithm>
#include <iterator>
#include <string>

#include "base/bind.h"
#include "base/callback.h"
#include "base/feature_list.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/metrics/field_trial_params.h"
#include "base/task/post_task.h"
#include "content/browser/appcache/appcache_navigation_handle.h"
#include "content/browser/appcache/appcache_navigation_handle_core.h"
#include "content/browser/file_url_loader_factory.h"
#include "content/browser/shared_worker/shared_worker_host.h"
#include "content/browser/shared_worker/shared_worker_instance.h"
#include "content/browser/shared_worker/shared_worker_script_fetcher.h"
#include "content/browser/shared_worker/shared_worker_script_loader.h"
#include "content/browser/shared_worker/shared_worker_script_loader_factory.h"
#include "content/browser/storage_partition_impl.h"
#include "content/browser/url_loader_factory_getter.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/common/content_constants_internal.h"
#include "content/common/navigation_subresource_loader_params.h"
#include "content/common/service_worker/service_worker_provider.mojom.h"
#include "content/common/shared_worker/shared_worker_client.mojom.h"
#include "content/common/throttling_url_loader.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/common/bind_interface_helpers.h"
#include "content/public/common/content_features.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/renderer_preferences.h"
#include "mojo/public/cpp/bindings/strong_associated_binding.h"
#include "mojo/public/cpp/bindings/strong_binding.h"
#include "services/network/loader_util.h"
#include "services/network/public/cpp/features.h"
#include "third_party/blink/public/common/messaging/message_port_channel.h"
#include "third_party/blink/public/common/service_worker/service_worker_utils.h"
#include "url/origin.h"

namespace content {
namespace {

using StartLoaderCallback =
    base::OnceCallback<void(mojom::ServiceWorkerProviderInfoForSharedWorkerPtr,
                            network::mojom::URLLoaderFactoryAssociatedPtrInfo,
                            std::unique_ptr<URLLoaderFactoryBundleInfo>,
                            blink::mojom::SharedWorkerMainScriptLoadParamsPtr,
                            base::Optional<SubresourceLoaderParams>,
                            bool)>;

std::unique_ptr<URLLoaderFactoryBundleInfo> CreateFactoryBundle(
    int process_id,
    StoragePartitionImpl* storage_partition,
    bool file_support) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  DCHECK(blink::ServiceWorkerUtils::IsServicificationEnabled());

  ContentBrowserClient::NonNetworkURLLoaderFactoryMap non_network_factories;
  GetContentClient()
      ->browser()
      ->RegisterNonNetworkSubresourceURLLoaderFactories(
          process_id, MSG_ROUTING_NONE, &non_network_factories);

  auto factory_bundle = std::make_unique<URLLoaderFactoryBundleInfo>();
  for (auto& pair : non_network_factories) {
    const std::string& scheme = pair.first;
    std::unique_ptr<network::mojom::URLLoaderFactory> factory =
        std::move(pair.second);

    network::mojom::URLLoaderFactoryPtr factory_ptr;
    mojo::MakeStrongBinding(std::move(factory),
                            mojo::MakeRequest(&factory_ptr));
    factory_bundle->scheme_specific_factory_infos().emplace(
        scheme, factory_ptr.PassInterface());
  }

  if (file_support) {
    auto file_factory = std::make_unique<FileURLLoaderFactory>(
        storage_partition->browser_context()->GetPath(),
        base::CreateSequencedTaskRunnerWithTraits(
            {base::MayBlock(), base::TaskPriority::BEST_EFFORT,
             base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN}));
    network::mojom::URLLoaderFactoryPtr file_factory_ptr;
    mojo::MakeStrongBinding(std::move(file_factory),
                            mojo::MakeRequest(&file_factory_ptr));
    factory_bundle->scheme_specific_factory_infos().emplace(
        url::kFileScheme, file_factory_ptr.PassInterface());
  }

  // Use RenderProcessHost's network factory as the default factory if
  // NetworkService is off. If NetworkService is on the default factory is
  // set in CreateScriptLoaderOnIO().
  if (!base::FeatureList::IsEnabled(network::features::kNetworkService)) {
    // Using an opaque origin here should be safe - the URLLoaderFactory created
    // for such origin shouldn't have any special privileges.  Additionally, the
    // origin should not be inspected at all in the legacy, non-NetworkService
    // path.
    const url::Origin kSafeOrigin = url::Origin();

    network::mojom::URLLoaderFactoryPtr default_factory;
    RenderProcessHost::FromID(process_id)
        ->CreateURLLoaderFactory(kSafeOrigin,
                                 mojo::MakeRequest(&default_factory));
    factory_bundle->default_factory_info() = default_factory.PassInterface();
  }

  return factory_bundle;
}

void DidCreateScriptLoaderOnIO(
    StartLoaderCallback callback,
    mojom::ServiceWorkerProviderInfoForSharedWorkerPtr
        service_worker_provider_info,
    network::mojom::URLLoaderFactoryAssociatedPtrInfo
        main_script_loader_factory,
    std::unique_ptr<URLLoaderFactoryBundleInfo> subresource_loader_factories,
    blink::mojom::SharedWorkerMainScriptLoadParamsPtr main_script_load_params,
    base::Optional<SubresourceLoaderParams> subresource_loader_params,
    bool success) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  base::PostTaskWithTraits(
      FROM_HERE, {BrowserThread::UI},
      base::BindOnce(std::move(callback),
                     std::move(service_worker_provider_info),
                     std::move(main_script_loader_factory),
                     std::move(subresource_loader_factories),
                     std::move(main_script_load_params),
                     std::move(subresource_loader_params), success));
}

void CreateScriptLoaderOnIO(
    scoped_refptr<URLLoaderFactoryGetter> loader_factory_getter,
    std::unique_ptr<URLLoaderFactoryBundleInfo> factory_bundle_for_browser_info,
    std::unique_ptr<URLLoaderFactoryBundleInfo> subresource_loader_factories,
    scoped_refptr<ServiceWorkerContextWrapper> context,
    AppCacheNavigationHandleCore* appcache_handle_core,
    std::unique_ptr<network::SharedURLLoaderFactoryInfo>
        blob_url_loader_factory_info,
    std::unique_ptr<network::ResourceRequest> resource_request,
    int process_id,
    StartLoaderCallback callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  DCHECK(blink::ServiceWorkerUtils::IsServicificationEnabled());

  // Set up for service worker.
  auto provider_info = mojom::ServiceWorkerProviderInfoForSharedWorker::New();
  base::WeakPtr<ServiceWorkerProviderHost> host =
      context->PreCreateHostForSharedWorker(process_id, &provider_info);

  // Create the URL loader factory for SharedWorkerScriptLoaderFactory to use to
  // load the main script.
  scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory;
  if (blob_url_loader_factory_info) {
    // If we have a blob_url_loader_factory just use that directly rather than
    // creating a new URLLoaderFactoryBundle.
    url_loader_factory = network::SharedURLLoaderFactory::Create(
        std::move(blob_url_loader_factory_info));
  } else {
    // Create a factory bundle to use.
    scoped_refptr<URLLoaderFactoryBundle> factory_bundle =
        base::MakeRefCounted<URLLoaderFactoryBundle>(
            std::move(factory_bundle_for_browser_info));

    // Add the default factory to the bundle for browser if NetworkService
    // is on. When NetworkService is off, we already created the default factory
    // in CreateFactoryBundle().
    if (base::FeatureList::IsEnabled(network::features::kNetworkService)) {
      // Get the direct network factory from |loader_factory_getter|. When
      // NetworkService is enabled, it returns a factory that doesn't support
      // reconnection to the network service after a crash, but it's OK since
      // it's used for a single shared worker startup.
      network::mojom::URLLoaderFactoryPtr network_factory_ptr;
      loader_factory_getter->CloneNetworkFactory(
          mojo::MakeRequest(&network_factory_ptr));
      factory_bundle->SetDefaultFactory(std::move(network_factory_ptr));
    }

    url_loader_factory = factory_bundle;
  }

  // It's safe for |appcache_handle_core| to be a raw pointer. The core is owned
  // by AppCacheNavigationHandle on the UI thread, which posts a task to delete
  // the core on the IO thread on destruction, which must happen after this
  // task.
  base::WeakPtr<AppCacheHost> appcache_host =
      appcache_handle_core ? appcache_handle_core->host()->GetWeakPtr()
                           : nullptr;

  // NetworkService (PlzWorker):
  // Start loading a shared worker main script.
  if (base::FeatureList::IsEnabled(network::features::kNetworkService)) {
    // TODO(nhiroki): Figure out what we should do in |wc_getter| for loading
    // shared worker's main script.
    base::RepeatingCallback<WebContents*()> wc_getter =
        base::BindRepeating([]() -> WebContents* { return nullptr; });
    std::vector<std::unique_ptr<URLLoaderThrottle>> throttles =
        GetContentClient()->browser()->CreateURLLoaderThrottles(
            *resource_request, context->resource_context(), wc_getter,
            nullptr /* navigation_ui_data */, -1 /* frame_tree_node_id */);

    SharedWorkerScriptFetcher::CreateAndStart(
        std::make_unique<SharedWorkerScriptLoaderFactory>(
            process_id, host, std::move(appcache_host),
            context->resource_context(), std::move(url_loader_factory)),
        std::move(throttles), std::move(resource_request),
        base::BindOnce(DidCreateScriptLoaderOnIO, std::move(callback),
                       std::move(provider_info),
                       nullptr /* main_script_loader_factory */,
                       std::move(subresource_loader_factories)));
    return;
  }

  // Create the SharedWorkerScriptLoaderFactory.
  network::mojom::URLLoaderFactoryAssociatedPtrInfo main_script_loader_factory;
  mojo::MakeStrongAssociatedBinding(
      std::make_unique<SharedWorkerScriptLoaderFactory>(
          process_id, host->AsWeakPtr(), std::move(appcache_host),
          context->resource_context(), std::move(url_loader_factory)),
      mojo::MakeRequest(&main_script_loader_factory));

  DidCreateScriptLoaderOnIO(std::move(callback), std::move(provider_info),
                            std::move(main_script_loader_factory),
                            std::move(subresource_loader_factories),
                            nullptr /* main_script_load_params */,
                            base::nullopt /* subresource_loader_params */,
                            true /* success */);
}

}  // namespace

bool IsShuttingDown(RenderProcessHost* host) {
  return !host || host->FastShutdownStarted() ||
         host->IsKeepAliveRefCountDisabled();
}

SharedWorkerServiceImpl::SharedWorkerServiceImpl(
    StoragePartitionImpl* storage_partition,
    scoped_refptr<ServiceWorkerContextWrapper> service_worker_context,
    scoped_refptr<ChromeAppCacheService> appcache_service)
    : storage_partition_(storage_partition),
      service_worker_context_(std::move(service_worker_context)),
      appcache_service_(std::move(appcache_service)),
      weak_factory_(this) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
}

SharedWorkerServiceImpl::~SharedWorkerServiceImpl() {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
}

bool SharedWorkerServiceImpl::TerminateWorker(
    const GURL& url,
    const std::string& name,
    const url::Origin& constructor_origin) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  for (auto& host : worker_hosts_) {
    if (host->IsAvailable() &&
        host->instance()->Matches(url, name, constructor_origin)) {
      host->TerminateWorker();
      return true;
    }
  }
  return false;
}

void SharedWorkerServiceImpl::TerminateAllWorkersForTesting(
    base::OnceClosure callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  DCHECK(!terminate_all_workers_callback_);
  if (worker_hosts_.empty()) {
    // Run callback asynchronously to avoid re-entering the caller.
    base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                  std::move(callback));
  } else {
    terminate_all_workers_callback_ = std::move(callback);
    // Use an explicit iterator and be careful because TerminateWorker() can
    // call DestroyHost(), which removes the host from |worker_hosts_| and could
    // invalidate the iterator.
    for (auto it = worker_hosts_.begin(); it != worker_hosts_.end();)
      (*it++)->TerminateWorker();
  }
}

void SharedWorkerServiceImpl::SetWorkerTerminationCallbackForTesting(
    base::OnceClosure callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  terminate_all_workers_callback_ = std::move(callback);
}

void SharedWorkerServiceImpl::ConnectToWorker(
    int process_id,
    int frame_id,
    mojom::SharedWorkerInfoPtr info,
    mojom::SharedWorkerClientPtr client,
    blink::mojom::SharedWorkerCreationContextType creation_context_type,
    const blink::MessagePortChannel& message_port,
    scoped_refptr<network::SharedURLLoaderFactory> blob_url_loader_factory) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);

  RenderFrameHostImpl* render_frame_host =
      RenderFrameHostImpl::FromID(process_id, frame_id);
  if (!render_frame_host) {
    // TODO(nhiroki): Support the case where the requester is a worker (i.e.,
    // nested worker) (https://crbug.com/31666).
    client->OnScriptLoadFailed();
    return;
  }

  RenderFrameHost* main_frame =
      render_frame_host->frame_tree_node()->frame_tree()->GetMainFrame();
  if (!GetContentClient()->browser()->AllowSharedWorker(
          info->url, main_frame->GetLastCommittedURL(), info->name,
          render_frame_host->GetLastCommittedOrigin(),
          WebContentsImpl::FromRenderFrameHostID(process_id, frame_id)
              ->GetBrowserContext(),
          process_id, frame_id)) {
    client->OnScriptLoadFailed();
    return;
  }

  auto instance = std::make_unique<SharedWorkerInstance>(
      info->url, info->name, render_frame_host->GetLastCommittedOrigin(),
      info->content_security_policy, info->content_security_policy_type,
      info->creation_address_space, creation_context_type);

  SharedWorkerHost* host = FindAvailableSharedWorkerHost(*instance);
  if (host) {
    // Non-secure contexts cannot connect to secure workers, and secure contexts
    // cannot connect to non-secure workers:
    if (host->instance()->creation_context_type() != creation_context_type) {
      client->OnScriptLoadFailed();
      return;
    }

    // The process may be shutting down, in which case we will try to create a
    // new shared worker instead.
    if (!IsShuttingDown(RenderProcessHost::FromID(host->process_id()))) {
      host->AddClient(std::move(client), process_id, frame_id, message_port);
      return;
    }
    // Cleanup the existing shared worker now, to avoid having two matching
    // instances. This host would likely be observing the destruction of the
    // child process shortly, but we can clean this up now to avoid some
    // complexity.
    DestroyHost(host);
  }

  CreateWorker(std::move(instance), std::move(client), process_id, frame_id,
               message_port, std::move(blob_url_loader_factory));
}

void SharedWorkerServiceImpl::DestroyHost(SharedWorkerHost* host) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  worker_hosts_.erase(worker_hosts_.find(host));

  // Run the termination callback if no more workers.
  if (worker_hosts_.empty() && terminate_all_workers_callback_)
    std::move(terminate_all_workers_callback_).Run();
}

// TODO(nhiroki): Align this function with AddAdditionalRequestHeaders() in
// navigation_request.cc, FrameFetchContext, and WorkerFetchContext.
void SharedWorkerServiceImpl::AddAdditionalRequestHeaders(
    network::ResourceRequest* resource_request,
    BrowserContext* browser_context) {
  DCHECK(base::FeatureList::IsEnabled(network::features::kNetworkService));

  // TODO(nhiroki): Return early when the request is neither HTTP nor HTTPS
  // (i.e., Blob URL or Data URL). This should be checked by
  // SchemeIsHTTPOrHTTPS(), but currently cross-origin workers on extensions
  // are allowed and the check doesn't work well. See https://crbug.com/867302.

  // Set the "Accept" header.
  resource_request->headers.SetHeaderIfMissing(network::kAcceptHeader,
                                               network::kDefaultAcceptHeader);

  // Set the "DNT" header if necessary.
  RendererPreferences renderer_preferences;
  GetContentClient()->browser()->UpdateRendererPreferencesForWorker(
      browser_context, &renderer_preferences);
  if (renderer_preferences.enable_do_not_track)
    resource_request->headers.SetHeaderIfMissing(kDoNotTrackHeader, "1");

  // Set the "Save-Data" header if necessary.
  if (GetContentClient()->browser()->IsDataSaverEnabled(browser_context) &&
      !base::GetFieldTrialParamByFeatureAsBool(features::kDataSaverHoldback,
                                               "holdback_web", false)) {
    resource_request->headers.SetHeaderIfMissing("Save-Data", "on");
  }

  // Set the "Sec-Metadata" header if necessary.
  if (base::FeatureList::IsEnabled(features::kSecMetadata) ||
      base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kEnableExperimentalWebPlatformFeatures)) {
    // The worker's origin can be different from the constructor's origin, for
    // example, when the worker created from the extension.
    // TODO(hiroshige): Add DCHECK to make sure the same-originness once the
    // cross-origin workers are deprecated (https://crbug.com/867302).
    std::string site_value = "cross-site";
    if (resource_request->request_initiator->IsSameOriginWith(
            url::Origin::Create(resource_request->url))) {
      site_value = "same-origin";
    }
    std::string value = base::StringPrintf("destination=sharedworker, site=%s",
                                           site_value.c_str());
    resource_request->headers.SetHeaderIfMissing("Sec-Metadata", value);
  }
}

void SharedWorkerServiceImpl::CreateWorker(
    std::unique_ptr<SharedWorkerInstance> instance,
    mojom::SharedWorkerClientPtr client,
    int process_id,
    int frame_id,
    const blink::MessagePortChannel& message_port,
    scoped_refptr<network::SharedURLLoaderFactory> blob_url_loader_factory) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  DCHECK(!blob_url_loader_factory || instance->url().SchemeIsBlob());

  bool constructor_uses_file_url =
      instance->constructor_origin().scheme() == url::kFileScheme;

  // Create the host. We need to do this even before starting the worker,
  // because we are about to bounce to the IO thread. If another ConnectToWorker
  // request arrives in the meantime, it finds and reuses the host instead of
  // creating a new host and therefore new SharedWorker thread.
  auto host =
      std::make_unique<SharedWorkerHost>(this, std::move(instance), process_id);
  auto weak_host = host->AsWeakPtr();
  worker_hosts_.insert(std::move(host));

  // Bounce to the IO thread to setup service worker and appcache support in
  // case the request for the worker script will need to be intercepted by them.
  if (blink::ServiceWorkerUtils::IsServicificationEnabled()) {
    // Set up the factory bundle for non-NetworkService URLs, e.g.,
    // chrome-extension:// URLs. One factory bundle is consumed by the browser
    // for SharedWorkerScriptLoaderFactory, and one is sent to the renderer for
    // subresource loading.
    std::unique_ptr<URLLoaderFactoryBundleInfo> factory_bundle_for_browser =
        CreateFactoryBundle(process_id, storage_partition_,
                            constructor_uses_file_url);
    std::unique_ptr<URLLoaderFactoryBundleInfo> subresource_loader_factories =
        CreateFactoryBundle(process_id, storage_partition_,
                            constructor_uses_file_url);

    // NetworkService (PlzWorker):
    // Create a resource request for initiating shared worker script fetch from
    // the browser process.
    std::unique_ptr<network::ResourceRequest> resource_request;
    if (base::FeatureList::IsEnabled(network::features::kNetworkService)) {
      // TODO(nhiroki): Populate more fields like referrer.
      // (https://crbug.com/715632)
      resource_request = std::make_unique<network::ResourceRequest>();
      resource_request->url = weak_host->instance()->url();
      resource_request->request_initiator =
          weak_host->instance()->constructor_origin();
      resource_request->resource_type = RESOURCE_TYPE_SHARED_WORKER;

      auto* render_process_host = RenderProcessHost::FromID(process_id);
      DCHECK(!IsShuttingDown(render_process_host));
      AddAdditionalRequestHeaders(resource_request.get(),
                                  render_process_host->GetBrowserContext());
    }

    // NetworkService (PlzWorker):
    // An appcache interceptor is available only when the network service is
    // enabled.
    AppCacheNavigationHandleCore* appcache_handle_core = nullptr;
    if (base::FeatureList::IsEnabled(network::features::kNetworkService)) {
      auto appcache_handle =
          std::make_unique<AppCacheNavigationHandle>(appcache_service_.get());
      appcache_handle_core = appcache_handle->core();
      weak_host->SetAppCacheHandle(std::move(appcache_handle));
    }

    base::PostTaskWithTraits(
        FROM_HERE, {BrowserThread::IO},
        base::BindOnce(
            &CreateScriptLoaderOnIO,
            storage_partition_->url_loader_factory_getter(),
            std::move(factory_bundle_for_browser),
            std::move(subresource_loader_factories), service_worker_context_,
            appcache_handle_core,
            blob_url_loader_factory ? blob_url_loader_factory->Clone()
                                    : nullptr,
            std::move(resource_request), process_id,
            base::BindOnce(&SharedWorkerServiceImpl::DidCreateScriptLoader,
                           weak_factory_.GetWeakPtr(), std::move(instance),
                           weak_host, std::move(client), process_id, frame_id,
                           message_port)));
    return;
  }

  // Legacy case (to be deprecated):
  StartWorker(std::move(instance), weak_host, std::move(client), process_id,
              frame_id, message_port,
              nullptr /* service_worker_provider_info */,
              {} /* main_script_loader_factory */,
              nullptr /* subresource_loader_factories */,
              nullptr /* main_script_load_params */,
              base::nullopt /* subresource_loader_params */);
}

void SharedWorkerServiceImpl::DidCreateScriptLoader(
    std::unique_ptr<SharedWorkerInstance> instance,
    base::WeakPtr<SharedWorkerHost> host,
    mojom::SharedWorkerClientPtr client,
    int process_id,
    int frame_id,
    const blink::MessagePortChannel& message_port,
    mojom::ServiceWorkerProviderInfoForSharedWorkerPtr
        service_worker_provider_info,
    network::mojom::URLLoaderFactoryAssociatedPtrInfo
        main_script_loader_factory,
    std::unique_ptr<URLLoaderFactoryBundleInfo> subresource_loader_factories,
    blink::mojom::SharedWorkerMainScriptLoadParamsPtr main_script_load_params,
    base::Optional<SubresourceLoaderParams> subresource_loader_params,
    bool success) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  DCHECK(blink::ServiceWorkerUtils::IsServicificationEnabled());

  // NetworkService (PlzWorker):
  // If the script fetcher fails to load shared worker's main script, notify the
  // client of the failure and abort shared worker startup.
  if (!success) {
    DCHECK(base::FeatureList::IsEnabled(network::features::kNetworkService));
    client->OnScriptLoadFailed();
    return;
  }

  StartWorker(
      std::move(instance), std::move(host), std::move(client), process_id,
      frame_id, message_port, std::move(service_worker_provider_info),
      std::move(main_script_loader_factory),
      std::move(subresource_loader_factories),
      std::move(main_script_load_params), std::move(subresource_loader_params));
}

void SharedWorkerServiceImpl::StartWorker(
    std::unique_ptr<SharedWorkerInstance> instance,
    base::WeakPtr<SharedWorkerHost> host,
    mojom::SharedWorkerClientPtr client,
    int process_id,
    int frame_id,
    const blink::MessagePortChannel& message_port,
    mojom::ServiceWorkerProviderInfoForSharedWorkerPtr
        service_worker_provider_info,
    network::mojom::URLLoaderFactoryAssociatedPtrInfo
        main_script_loader_factory,
    std::unique_ptr<URLLoaderFactoryBundleInfo> subresource_loader_factories,
    blink::mojom::SharedWorkerMainScriptLoadParamsPtr main_script_load_params,
    base::Optional<SubresourceLoaderParams> subresource_loader_params) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);

  // The host may already be gone if something forcibly terminated the worker
  // before it could start (e.g., in tests or a UI action). Just fail.
  if (!host)
    return;

  RenderProcessHost* process_host = RenderProcessHost::FromID(process_id);
  // If the target process is shutting down, then just drop this request and
  // tell the host to destruct. This also means clients that were still waiting
  // for the shared worker to start will fail.
  if (!process_host || IsShuttingDown(process_host)) {
    host->TerminateWorker();
    return;
  }

  // Get the factory used to instantiate the new shared worker instance in
  // the target process.
  mojom::SharedWorkerFactoryPtr factory;
  BindInterface(process_host, &factory);

  host->Start(std::move(factory), std::move(service_worker_provider_info),
              std::move(main_script_loader_factory),
              std::move(main_script_load_params),
              std::move(subresource_loader_factories),
              std::move(subresource_loader_params));
  host->AddClient(std::move(client), process_id, frame_id, message_port);
}

SharedWorkerHost* SharedWorkerServiceImpl::FindAvailableSharedWorkerHost(
    const SharedWorkerInstance& instance) {
  for (auto& host : worker_hosts_) {
    if (host->IsAvailable() && host->instance()->Matches(instance))
      return host.get();
  }
  return nullptr;
}

}  // namespace content