/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "third_party/blink/renderer/modules/indexeddb/idb_factory.h"

#include <memory>
#include <utility>

#include "third_party/blink/public/mojom/indexeddb/indexeddb.mojom-blink.h"
#include "third_party/blink/public/platform/interface_provider.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/task_type.h"
#include "third_party/blink/public/platform/web_security_origin.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_binding_for_modules.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/dom_exception.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/frame/use_counter.h"
#include "third_party/blink/renderer/core/probe/core_probes.h"
#include "third_party/blink/renderer/modules/indexed_db_names.h"
#include "third_party/blink/renderer/modules/indexeddb/idb_database.h"
#include "third_party/blink/renderer/modules/indexeddb/idb_database_callbacks.h"
#include "third_party/blink/renderer/modules/indexeddb/idb_database_info.h"
#include "third_party/blink/renderer/modules/indexeddb/idb_key.h"
#include "third_party/blink/renderer/modules/indexeddb/idb_name_and_version.h"
#include "third_party/blink/renderer/modules/indexeddb/idb_tracing.h"
#include "third_party/blink/renderer/modules/indexeddb/indexed_db_client.h"
#include "third_party/blink/renderer/modules/indexeddb/web_idb_callbacks.h"
#include "third_party/blink/renderer/modules/indexeddb/web_idb_database_callbacks.h"
#include "third_party/blink/renderer/modules/indexeddb/web_idb_factory.h"
#include "third_party/blink/renderer/modules/indexeddb/web_idb_factory_impl.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
#include "third_party/blink/renderer/platform/histogram.h"
#include "third_party/blink/renderer/platform/weborigin/security_origin.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"

namespace blink {

namespace {

class WebIDBGetDBNamesCallbacksImpl : public WebIDBCallbacks {
 public:
  // static
  static std::unique_ptr<WebIDBGetDBNamesCallbacksImpl> Create(
      ScriptPromiseResolver* promise_resolver) {
    return base::WrapUnique(
        new WebIDBGetDBNamesCallbacksImpl(promise_resolver));
  }

  WebIDBGetDBNamesCallbacksImpl(ScriptPromiseResolver* promise_resolver)
      : promise_resolver_(promise_resolver) {
    probe::AsyncTaskScheduled(
        ExecutionContext::From(promise_resolver_->GetScriptState()),
        indexed_db_names::kIndexedDB, this);
  }

  ~WebIDBGetDBNamesCallbacksImpl() override {
    if (promise_resolver_) {
      probe::AsyncTaskCanceled(
          ExecutionContext::From(promise_resolver_->GetScriptState()), this);
      promise_resolver_->Reject(
          DOMException::Create(DOMExceptionCode::kUnknownError,
                               "An unexpected shutdown occured before the "
                               "databases() promise could be resolved"));
    }
  }

  void OnError(const IDBDatabaseError& error) override {
    if (!promise_resolver_)
      return;

    probe::AsyncTask async_task(
        ExecutionContext::From(promise_resolver_->GetScriptState()), this,
        "error");
    promise_resolver_->Reject(
        DOMException::Create(DOMExceptionCode::kUnknownError,
                             "The databases() promise was rejected."));
    promise_resolver_.Clear();
  }

  void OnSuccess(
      const Vector<IDBNameAndVersion>& idb_name_and_version_list) override {
    if (!promise_resolver_)
      return;

    HeapVector<Member<IDBDatabaseInfo>> name_and_version_list;
    for (size_t i = 0; i < idb_name_and_version_list.size(); ++i) {
      IDBDatabaseInfo* idb_info = IDBDatabaseInfo::Create();
      idb_info->setName(idb_name_and_version_list[i].name);
      idb_info->setVersion(idb_name_and_version_list[i].version);
      name_and_version_list.push_back(idb_info);
    }
    probe::AsyncTask async_task(
        ExecutionContext::From(promise_resolver_->GetScriptState()), this,
        "success");
    promise_resolver_->Resolve(name_and_version_list);
    promise_resolver_.Clear();
  }

  void OnSuccess(const Vector<String>&) override { NOTREACHED(); }

  void OnSuccess(WebIDBCursor* cursor,
                 std::unique_ptr<IDBKey> key,
                 std::unique_ptr<IDBKey> primary_key,
                 std::unique_ptr<IDBValue> value) override {
    NOTREACHED();
  }

  void OnSuccess(WebIDBDatabase* backend,
                 const IDBDatabaseMetadata& metadata) override {
    NOTREACHED();
  }

  void OnSuccess(std::unique_ptr<IDBKey> key) override { NOTREACHED(); }

  void OnSuccess(std::unique_ptr<IDBValue> value) override { NOTREACHED(); }

  void OnSuccess(Vector<std::unique_ptr<IDBValue>> values) override {
    NOTREACHED();
  }

  void OnSuccess(long long value) override { NOTREACHED(); }

  void OnSuccess() override { NOTREACHED(); }

  void OnSuccess(std::unique_ptr<IDBKey> key,
                 std::unique_ptr<IDBKey> primary_key,
                 std::unique_ptr<IDBValue> value) override {
    NOTREACHED();
  }

  void OnBlocked(long long old_version) override { NOTREACHED(); }

  void OnUpgradeNeeded(long long old_version,
                       WebIDBDatabase* database,
                       const IDBDatabaseMetadata& metadata,
                       mojom::IDBDataLoss data_loss,
                       String data_loss_message) override {
    NOTREACHED();
  }

  void Detach() override { NOTREACHED(); }

 private:
  Persistent<ScriptPromiseResolver> promise_resolver_;
};

}  // namespace

static const char kPermissionDeniedErrorMessage[] =
    "The user denied permission to access the database.";

IDBFactory::IDBFactory() = default;

IDBFactory::IDBFactory(std::unique_ptr<WebIDBFactory> web_idb_factory)
    : web_idb_factory_(std::move(web_idb_factory)) {}

static bool IsContextValid(ExecutionContext* context) {
  DCHECK(IsA<Document>(context) || context->IsWorkerGlobalScope());
  if (auto* document = DynamicTo<Document>(context))
    return document->GetFrame() && document->GetPage();
  return true;
}

WebIDBFactory* IDBFactory::GetFactory() {
  if (!web_idb_factory_) {
    mojom::blink::IDBFactoryPtrInfo web_idb_factory_host_info;
    Platform::Current()->GetInterfaceProvider()->GetInterface(
        mojo::MakeRequest(&web_idb_factory_host_info));
    web_idb_factory_ = std::make_unique<WebIDBFactoryImpl>(
        std::move(web_idb_factory_host_info));
  }
  return web_idb_factory_.get();
}

ScriptPromise IDBFactory::GetDatabaseInfo(ScriptState* script_state,
                                          ExceptionState& exception_state) {
  ScriptPromiseResolver* resolver = ScriptPromiseResolver::Create(script_state);

  if (!ExecutionContext::From(script_state)
           ->GetSecurityOrigin()
           ->CanAccessDatabase()) {
    exception_state.ThrowSecurityError(
        "Access to the IndexedDB API is denied in this context.");
    resolver->Reject();
    return resolver->Promise();
  }

  GetFactory()->GetDatabaseInfo(
      WebIDBGetDBNamesCallbacksImpl::Create(resolver).release(),
      WebSecurityOrigin(
          ExecutionContext::From(script_state)->GetSecurityOrigin()),
      ExecutionContext::From(script_state)
          ->GetTaskRunner(TaskType::kInternalIndexedDB));
  ScriptPromise promise = resolver->Promise();
  return promise;
}

IDBRequest* IDBFactory::GetDatabaseNames(ScriptState* script_state,
                                         ExceptionState& exception_state) {
  IDB_TRACE("IDBFactory::getDatabaseNamesRequestSetup");
  IDBRequest::AsyncTraceState metrics("IDBFactory::getDatabaseNames");
  IDBRequest* request = IDBRequest::Create(script_state, IDBRequest::Source(),
                                           nullptr, std::move(metrics));
  // TODO(jsbell): Used only by inspector; remove unneeded checks/exceptions?
  if (!IsContextValid(ExecutionContext::From(script_state)))
    return nullptr;
  if (!ExecutionContext::From(script_state)
           ->GetSecurityOrigin()
           ->CanAccessDatabase()) {
    exception_state.ThrowSecurityError(
        "access to the Indexed Database API is denied in this context.");
    return nullptr;
  }

  if (ExecutionContext::From(script_state)->GetSecurityOrigin()->IsLocal()) {
    UseCounter::Count(ExecutionContext::From(script_state),
                      WebFeature::kFileAccessedDatabase);
  }

  if (!IndexedDBClient::From(ExecutionContext::From(script_state))
           ->AllowIndexedDB(ExecutionContext::From(script_state))) {
    request->HandleResponse(DOMException::Create(
        DOMExceptionCode::kUnknownError, kPermissionDeniedErrorMessage));
    return request;
  }

  GetFactory()->GetDatabaseNames(
      request->CreateWebCallbacks().release(),
      WebSecurityOrigin(
          ExecutionContext::From(script_state)->GetSecurityOrigin()),
      ExecutionContext::From(script_state)
          ->GetTaskRunner(TaskType::kInternalIndexedDB));
  return request;
}

IDBOpenDBRequest* IDBFactory::open(ScriptState* script_state,
                                   const String& name,
                                   unsigned long long version,
                                   ExceptionState& exception_state) {
  if (!version) {
    exception_state.ThrowTypeError("The version provided must not be 0.");
    return nullptr;
  }
  return OpenInternal(script_state, name, version, exception_state);
}

IDBOpenDBRequest* IDBFactory::OpenInternal(ScriptState* script_state,
                                           const String& name,
                                           int64_t version,
                                           ExceptionState& exception_state) {
  IDB_TRACE1("IDBFactory::open", "name", name.Utf8());
  IDBRequest::AsyncTraceState metrics("IDBFactory::open");
  DCHECK(version >= 1 || version == IDBDatabaseMetadata::kNoVersion);
  if (!IsContextValid(ExecutionContext::From(script_state)))
    return nullptr;
  if (!ExecutionContext::From(script_state)
           ->GetSecurityOrigin()
           ->CanAccessDatabase()) {
    exception_state.ThrowSecurityError(
        "access to the Indexed Database API is denied in this context.");
    return nullptr;
  }

  if (ExecutionContext::From(script_state)->GetSecurityOrigin()->IsLocal()) {
    UseCounter::Count(ExecutionContext::From(script_state),
                      WebFeature::kFileAccessedDatabase);
  }

  IDBDatabaseCallbacks* database_callbacks = IDBDatabaseCallbacks::Create();
  int64_t transaction_id = IDBDatabase::NextTransactionId();
  IDBOpenDBRequest* request =
      IDBOpenDBRequest::Create(script_state, database_callbacks, transaction_id,
                               version, std::move(metrics));

  if (!IndexedDBClient::From(ExecutionContext::From(script_state))
           ->AllowIndexedDB(ExecutionContext::From(script_state))) {
    request->HandleResponse(DOMException::Create(
        DOMExceptionCode::kUnknownError, kPermissionDeniedErrorMessage));
    return request;
  }

  GetFactory()->Open(
      name, version, transaction_id, request->CreateWebCallbacks().release(),
      database_callbacks->CreateWebCallbacks().release(),
      WebSecurityOrigin(
          ExecutionContext::From(script_state)->GetSecurityOrigin()),
      ExecutionContext::From(script_state)
          ->GetTaskRunner(TaskType::kInternalIndexedDB));
  return request;
}

IDBOpenDBRequest* IDBFactory::open(ScriptState* script_state,
                                   const String& name,
                                   ExceptionState& exception_state) {
  return OpenInternal(script_state, name, IDBDatabaseMetadata::kNoVersion,
                      exception_state);
}

IDBOpenDBRequest* IDBFactory::deleteDatabase(ScriptState* script_state,
                                             const String& name,
                                             ExceptionState& exception_state) {
  return DeleteDatabaseInternal(script_state, name, exception_state,
                                /*force_close=*/false);
}

IDBOpenDBRequest* IDBFactory::CloseConnectionsAndDeleteDatabase(
    ScriptState* script_state,
    const String& name,
    ExceptionState& exception_state) {
  // TODO(jsbell): Used only by inspector; remove unneeded checks/exceptions?
  return DeleteDatabaseInternal(script_state, name, exception_state,
                                /*force_close=*/true);
}

IDBOpenDBRequest* IDBFactory::DeleteDatabaseInternal(
    ScriptState* script_state,
    const String& name,
    ExceptionState& exception_state,
    bool force_close) {
  IDB_TRACE1("IDBFactory::deleteDatabase", "name", name.Utf8());
  IDBRequest::AsyncTraceState metrics("IDBFactory::deleteDatabase");
  if (!IsContextValid(ExecutionContext::From(script_state)))
    return nullptr;
  if (!ExecutionContext::From(script_state)
           ->GetSecurityOrigin()
           ->CanAccessDatabase()) {
    exception_state.ThrowSecurityError(
        "access to the Indexed Database API is denied in this context.");
    return nullptr;
  }

  if (ExecutionContext::From(script_state)->GetSecurityOrigin()->IsLocal()) {
    UseCounter::Count(ExecutionContext::From(script_state),
                      WebFeature::kFileAccessedDatabase);
  }

  IDBOpenDBRequest* request = IDBOpenDBRequest::Create(
      script_state, nullptr, 0, IDBDatabaseMetadata::kDefaultVersion,
      std::move(metrics));

  if (!IndexedDBClient::From(ExecutionContext::From(script_state))
           ->AllowIndexedDB(ExecutionContext::From(script_state))) {
    request->HandleResponse(DOMException::Create(
        DOMExceptionCode::kUnknownError, kPermissionDeniedErrorMessage));
    return request;
  }

  GetFactory()->DeleteDatabase(
      name, request->CreateWebCallbacks().release(),
      WebSecurityOrigin(
          ExecutionContext::From(script_state)->GetSecurityOrigin()),
      force_close,
      ExecutionContext::From(script_state)
          ->GetTaskRunner(TaskType::kInternalIndexedDB));
  return request;
}

short IDBFactory::cmp(ScriptState* script_state,
                      const ScriptValue& first_value,
                      const ScriptValue& second_value,
                      ExceptionState& exception_state) {
  const std::unique_ptr<IDBKey> first =
      ScriptValue::To<std::unique_ptr<IDBKey>>(script_state->GetIsolate(),
                                               first_value, exception_state);
  if (exception_state.HadException())
    return 0;
  DCHECK(first);
  if (!first->IsValid()) {
    exception_state.ThrowDOMException(DOMExceptionCode::kDataError,
                                      IDBDatabase::kNotValidKeyErrorMessage);
    return 0;
  }

  const std::unique_ptr<IDBKey> second =
      ScriptValue::To<std::unique_ptr<IDBKey>>(script_state->GetIsolate(),
                                               second_value, exception_state);
  if (exception_state.HadException())
    return 0;
  DCHECK(second);
  if (!second->IsValid()) {
    exception_state.ThrowDOMException(DOMExceptionCode::kDataError,
                                      IDBDatabase::kNotValidKeyErrorMessage);
    return 0;
  }

  return static_cast<short>(first->Compare(second.get()));
}

}  // namespace blink