// 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/push_messaging/push_messaging_router.h"

#include <string>

#include "base/bind.h"
#include "base/metrics/histogram_macros.h"
#include "content/browser/service_worker/service_worker_context_wrapper.h"
#include "content/browser/service_worker/service_worker_registration.h"
#include "content/browser/service_worker/service_worker_storage.h"
#include "content/common/service_worker/service_worker_messages.h"
#include "content/common/service_worker/service_worker_status_code.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/common/push_event_payload.h"
#include "content/public/common/push_messaging_status.mojom.h"

namespace content {

namespace {

// The number of seconds for which the event triggered by a push message should
// be allowed to run.
const int kPushMessageTimeoutSeconds = 90;

void RunDeliverCallback(
    const PushMessagingRouter::DeliverMessageCallback& deliver_message_callback,
    mojom::PushDeliveryStatus delivery_status) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  BrowserThread::PostTask(
      BrowserThread::UI, FROM_HERE,
      base::BindOnce(deliver_message_callback, delivery_status));
}

}  // namespace

// static
void PushMessagingRouter::DeliverMessage(
    BrowserContext* browser_context,
    const GURL& origin,
    int64_t service_worker_registration_id,
    const PushEventPayload& payload,
    const DeliverMessageCallback& deliver_message_callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  StoragePartition* partition =
      BrowserContext::GetStoragePartitionForSite(browser_context, origin);
  scoped_refptr<ServiceWorkerContextWrapper> service_worker_context =
      static_cast<ServiceWorkerContextWrapper*>(
          partition->GetServiceWorkerContext());
  BrowserThread::PostTask(
      BrowserThread::IO, FROM_HERE,
      base::BindOnce(&PushMessagingRouter::FindServiceWorkerRegistration,
                     origin, service_worker_registration_id, payload,
                     deliver_message_callback, service_worker_context));
}

// static
void PushMessagingRouter::FindServiceWorkerRegistration(
    const GURL& origin,
    int64_t service_worker_registration_id,
    const PushEventPayload& payload,
    const DeliverMessageCallback& deliver_message_callback,
    scoped_refptr<ServiceWorkerContextWrapper> service_worker_context) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  // Try to acquire the registration from storage. If it's already live we'll
  // receive it right away. If not, it will be revived from storage.
  service_worker_context->FindReadyRegistrationForId(
      service_worker_registration_id, origin,
      base::Bind(&PushMessagingRouter::FindServiceWorkerRegistrationCallback,
                 payload, deliver_message_callback));
}

// static
void PushMessagingRouter::FindServiceWorkerRegistrationCallback(
    const PushEventPayload& payload,
    const DeliverMessageCallback& deliver_message_callback,
    ServiceWorkerStatusCode service_worker_status,
    scoped_refptr<ServiceWorkerRegistration> service_worker_registration) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  UMA_HISTOGRAM_ENUMERATION("PushMessaging.DeliveryStatus.FindServiceWorker",
                            service_worker_status,
                            SERVICE_WORKER_ERROR_MAX_VALUE);
  if (service_worker_status == SERVICE_WORKER_ERROR_NOT_FOUND) {
    RunDeliverCallback(deliver_message_callback,
                       mojom::PushDeliveryStatus::NO_SERVICE_WORKER);
    return;
  }
  if (service_worker_status != SERVICE_WORKER_OK) {
    RunDeliverCallback(deliver_message_callback,
                       mojom::PushDeliveryStatus::SERVICE_WORKER_ERROR);
    return;
  }

  ServiceWorkerVersion* version = service_worker_registration->active_version();
  DCHECK(version);

  // Hold on to the service worker registration in the callback to keep it
  // alive until the callback dies. Otherwise the registration could be
  // released when this method returns - before the event is delivered to the
  // service worker.
  version->RunAfterStartWorker(
      ServiceWorkerMetrics::EventType::PUSH,
      base::BindOnce(&PushMessagingRouter::DeliverMessageToWorker,
                     base::WrapRefCounted(version), service_worker_registration,
                     payload, deliver_message_callback),
      base::BindOnce(&PushMessagingRouter::DeliverMessageEnd,
                     deliver_message_callback, service_worker_registration));
}

// static
void PushMessagingRouter::DeliverMessageToWorker(
    const scoped_refptr<ServiceWorkerVersion>& service_worker,
    const scoped_refptr<ServiceWorkerRegistration>& service_worker_registration,
    const PushEventPayload& payload,
    const DeliverMessageCallback& deliver_message_callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  int request_id = service_worker->StartRequestWithCustomTimeout(
      ServiceWorkerMetrics::EventType::PUSH,
      base::Bind(&PushMessagingRouter::DeliverMessageEnd,
                 deliver_message_callback, service_worker_registration),
      base::TimeDelta::FromSeconds(kPushMessageTimeoutSeconds),
      ServiceWorkerVersion::KILL_ON_TIMEOUT);

  service_worker->event_dispatcher()->DispatchPushEvent(
      payload, service_worker->CreateSimpleEventCallback(request_id));
}

// static
void PushMessagingRouter::DeliverMessageEnd(
    const DeliverMessageCallback& deliver_message_callback,
    const scoped_refptr<ServiceWorkerRegistration>& service_worker_registration,
    ServiceWorkerStatusCode service_worker_status) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  UMA_HISTOGRAM_ENUMERATION("PushMessaging.DeliveryStatus.ServiceWorkerEvent",
                            service_worker_status,
                            SERVICE_WORKER_ERROR_MAX_VALUE);
  mojom::PushDeliveryStatus delivery_status =
      mojom::PushDeliveryStatus::SERVICE_WORKER_ERROR;
  switch (service_worker_status) {
    case SERVICE_WORKER_OK:
      delivery_status = mojom::PushDeliveryStatus::SUCCESS;
      break;
    case SERVICE_WORKER_ERROR_EVENT_WAITUNTIL_REJECTED:
      delivery_status = mojom::PushDeliveryStatus::EVENT_WAITUNTIL_REJECTED;
      break;
    case SERVICE_WORKER_ERROR_TIMEOUT:
      delivery_status = mojom::PushDeliveryStatus::TIMEOUT;
      break;
    case SERVICE_WORKER_ERROR_FAILED:
    case SERVICE_WORKER_ERROR_ABORT:
    case SERVICE_WORKER_ERROR_START_WORKER_FAILED:
    case SERVICE_WORKER_ERROR_PROCESS_NOT_FOUND:
    case SERVICE_WORKER_ERROR_NOT_FOUND:
    case SERVICE_WORKER_ERROR_IPC_FAILED:
    case SERVICE_WORKER_ERROR_SCRIPT_EVALUATE_FAILED:
    case SERVICE_WORKER_ERROR_DISK_CACHE:
    case SERVICE_WORKER_ERROR_REDUNDANT:
    case SERVICE_WORKER_ERROR_DISALLOWED:
      delivery_status = mojom::PushDeliveryStatus::SERVICE_WORKER_ERROR;
      break;
    case SERVICE_WORKER_ERROR_EXISTS:
    case SERVICE_WORKER_ERROR_INSTALL_WORKER_FAILED:
    case SERVICE_WORKER_ERROR_ACTIVATE_WORKER_FAILED:
    case SERVICE_WORKER_ERROR_NETWORK:
    case SERVICE_WORKER_ERROR_SECURITY:
    case SERVICE_WORKER_ERROR_STATE:
    case SERVICE_WORKER_ERROR_MAX_VALUE:
      NOTREACHED() << "Got unexpected error code: " << service_worker_status
                   << " " << ServiceWorkerStatusToString(service_worker_status);
      delivery_status = mojom::PushDeliveryStatus::SERVICE_WORKER_ERROR;
      break;
  }
  RunDeliverCallback(deliver_message_callback, delivery_status);
}

}  // namespace content