// Copyright (c) 2013 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include "atom/renderer/atom_renderer_client.h"

#include <string>
#include <vector>

#include "atom/common/api/electron_bindings.h"
#include "atom/common/api/event_emitter_caller.h"
#include "atom/common/asar/asar_util.h"
#include "atom/common/node_bindings.h"
#include "atom/common/node_includes.h"
#include "atom/common/options_switches.h"
#include "atom/renderer/atom_render_frame_observer.h"
#include "atom/renderer/web_worker_observer.h"
#include "base/command_line.h"
#include "content/public/renderer/render_frame.h"
#include "native_mate/dictionary.h"
#include "third_party/blink/public/web/web_document.h"
#include "third_party/blink/public/web/web_local_frame.h"
#include "third_party/electron_node/src/node_native_module_env.h"

namespace atom {

namespace {

bool IsDevToolsExtension(content::RenderFrame* render_frame) {
  return static_cast<GURL>(render_frame->GetWebFrame()->GetDocument().Url())
      .SchemeIs("chrome-extension");
}

}  // namespace

AtomRendererClient::AtomRendererClient()
    : node_bindings_(NodeBindings::Create(NodeBindings::RENDERER)),
      electron_bindings_(new ElectronBindings(uv_default_loop())) {}

AtomRendererClient::~AtomRendererClient() {
  asar::ClearArchives();
}

void AtomRendererClient::RenderFrameCreated(
    content::RenderFrame* render_frame) {
  new AtomRenderFrameObserver(render_frame, this);
  RendererClientBase::RenderFrameCreated(render_frame);
}

void AtomRendererClient::RunScriptsAtDocumentStart(
    content::RenderFrame* render_frame) {
  // Inform the document start pharse.
  v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
  node::Environment* env = GetEnvironment(render_frame);
  if (env)
    mate::EmitEvent(env->isolate(), env->process_object(), "document-start");
}

void AtomRendererClient::RunScriptsAtDocumentEnd(
    content::RenderFrame* render_frame) {
  // Inform the document end pharse.
  v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
  node::Environment* env = GetEnvironment(render_frame);
  if (env)
    mate::EmitEvent(env->isolate(), env->process_object(), "document-end");
}

void AtomRendererClient::DidCreateScriptContext(
    v8::Handle<v8::Context> renderer_context,
    content::RenderFrame* render_frame) {
  RendererClientBase::DidCreateScriptContext(renderer_context, render_frame);

  // TODO(zcbenz): Do not create Node environment if node integration is not
  // enabled.

  auto* command_line = base::CommandLine::ForCurrentProcess();

  // Only load node if we are a main frame or a devtools extension
  // unless node support has been explicitly enabled for sub frames
  bool reuse_renderer_processes_enabled =
      command_line->HasSwitch(switches::kDisableElectronSiteInstanceOverrides);
  // Consider the window not "opened" if it does not have an Opener, or if a
  // user has manually opted in to leaking node in the renderer
  bool is_not_opened =
      !render_frame->GetWebFrame()->Opener() ||
      command_line->HasSwitch(switches::kEnableNodeLeakageInRenderers);
  // Consider this the main frame if it is both a Main Frame and it wasn't
  // opened.  We allow an opened main frame to have node if renderer process
  // reuse is enabled as that will correctly free node environments prevent a
  // leak in child windows.
  bool is_main_frame = render_frame->IsMainFrame() &&
                       (is_not_opened || reuse_renderer_processes_enabled);
  bool is_devtools = IsDevToolsExtension(render_frame);
  bool allow_node_in_subframes =
      command_line->HasSwitch(switches::kNodeIntegrationInSubFrames);
  bool should_load_node =
      (is_main_frame || is_devtools || allow_node_in_subframes) &&
      !IsWebViewFrame(renderer_context, render_frame);
  if (!should_load_node) {
    return;
  }

  injected_frames_.insert(render_frame);

  // If this is the first environment we are creating, prepare the node
  // bindings.
  if (!node_integration_initialized_) {
    node_integration_initialized_ = true;
    node_bindings_->Initialize();
    node_bindings_->PrepareMessageLoop();
  }

  // Setup node tracing controller.
  if (!node::tracing::TraceEventHelper::GetAgent())
    node::tracing::TraceEventHelper::SetAgent(node::CreateAgent());

  // Setup node environment for each window.
  v8::Local<v8::Context> context =
      node::MaybeInitializeContext(renderer_context);
  DCHECK(!context.IsEmpty());
  node::Environment* env =
      node_bindings_->CreateEnvironment(context, nullptr, true);
  // If we have disabled the site instance overrides we should prevent loading
  // any non-context aware native module
  if (command_line->HasSwitch(switches::kDisableElectronSiteInstanceOverrides))
    env->ForceOnlyContextAwareNativeModules();

  environments_.insert(env);

  // Add Electron extended APIs.
  electron_bindings_->BindTo(env->isolate(), env->process_object());
  AddRenderBindings(env->isolate(), env->process_object());
  mate::Dictionary process_dict(env->isolate(), env->process_object());
  process_dict.SetReadOnly("isMainFrame", render_frame->IsMainFrame());

  // Load everything.
  node_bindings_->LoadEnvironment(env);

  if (node_bindings_->uv_env() == nullptr) {
    // Make uv loop being wrapped by window context.
    node_bindings_->set_uv_env(env);

    // Give the node loop a run to make sure everything is ready.
    node_bindings_->RunMessageLoop();
  }
}

void AtomRendererClient::WillReleaseScriptContext(
    v8::Handle<v8::Context> context,
    content::RenderFrame* render_frame) {
  if (injected_frames_.find(render_frame) == injected_frames_.end())
    return;
  injected_frames_.erase(render_frame);

  node::Environment* env = node::Environment::GetCurrent(context);
  if (environments_.find(env) == environments_.end())
    return;
  environments_.erase(env);

  mate::EmitEvent(env->isolate(), env->process_object(), "exit");

  // The main frame may be replaced.
  if (env == node_bindings_->uv_env())
    node_bindings_->set_uv_env(nullptr);

  // Destroy the node environment.  We only do this if node support has been
  // enabled for sub-frames to avoid a change-of-behavior / introduce crashes
  // for existing users.
  // We also do this if we have disable electron site instance overrides to
  // avoid memory leaks
  auto* command_line = base::CommandLine::ForCurrentProcess();
  if (command_line->HasSwitch(switches::kNodeIntegrationInSubFrames) ||
      command_line->HasSwitch(switches::kDisableElectronSiteInstanceOverrides))
    node::FreeEnvironment(env);

  // ElectronBindings is tracking node environments.
  electron_bindings_->EnvironmentDestroyed(env);
}

bool AtomRendererClient::ShouldFork(blink::WebLocalFrame* frame,
                                    const GURL& url,
                                    const std::string& http_method,
                                    bool is_initial_navigation,
                                    bool is_server_redirect) {
  // Handle all the navigations and reloads in browser.
  // FIXME We only support GET here because http method will be ignored when
  // the OpenURLFromTab is triggered, which means form posting would not work,
  // we should solve this by patching Chromium in future.
  return http_method == "GET";
}

void AtomRendererClient::DidInitializeWorkerContextOnWorkerThread(
    v8::Local<v8::Context> context) {
  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kNodeIntegrationInWorker)) {
    WebWorkerObserver::GetCurrent()->ContextCreated(context);
  }
}

void AtomRendererClient::WillDestroyWorkerContextOnWorkerThread(
    v8::Local<v8::Context> context) {
  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kNodeIntegrationInWorker)) {
    WebWorkerObserver::GetCurrent()->ContextWillDestroy(context);
  }
}

void AtomRendererClient::SetupMainWorldOverrides(
    v8::Handle<v8::Context> context,
    content::RenderFrame* render_frame) {
  // Setup window overrides in the main world context
  // Wrap the bundle into a function that receives the isolatedWorld as
  // an argument.
  auto* isolate = context->GetIsolate();
  std::vector<v8::Local<v8::String>> isolated_bundle_params = {
      node::FIXED_ONE_BYTE_STRING(isolate, "nodeProcess"),
      node::FIXED_ONE_BYTE_STRING(isolate, "isolatedWorld")};

  auto* env = GetEnvironment(render_frame);
  DCHECK(env);

  std::vector<v8::Local<v8::Value>> isolated_bundle_args = {
      env->process_object(),
      GetContext(render_frame->GetWebFrame(), isolate)->Global()};

  node::native_module::NativeModuleEnv::CompileAndCall(
      context, "electron/js2c/isolated_bundle", &isolated_bundle_params,
      &isolated_bundle_args, nullptr);
}

void AtomRendererClient::SetupExtensionWorldOverrides(
    v8::Handle<v8::Context> context,
    content::RenderFrame* render_frame,
    int world_id) {
  auto* isolate = context->GetIsolate();

  std::vector<v8::Local<v8::String>> isolated_bundle_params = {
      node::FIXED_ONE_BYTE_STRING(isolate, "nodeProcess"),
      node::FIXED_ONE_BYTE_STRING(isolate, "isolatedWorld"),
      node::FIXED_ONE_BYTE_STRING(isolate, "worldId")};

  auto* env = GetEnvironment(render_frame);
  if (!env)
    return;

  std::vector<v8::Local<v8::Value>> isolated_bundle_args = {
      env->process_object(),
      GetContext(render_frame->GetWebFrame(), isolate)->Global(),
      v8::Integer::New(isolate, world_id)};

  node::native_module::NativeModuleEnv::CompileAndCall(
      context, "electron/js2c/content_script_bundle", &isolated_bundle_params,
      &isolated_bundle_args, nullptr);
}

node::Environment* AtomRendererClient::GetEnvironment(
    content::RenderFrame* render_frame) const {
  if (injected_frames_.find(render_frame) == injected_frames_.end())
    return nullptr;
  v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
  auto context =
      GetContext(render_frame->GetWebFrame(), v8::Isolate::GetCurrent());
  node::Environment* env = node::Environment::GetCurrent(context);
  if (environments_.find(env) == environments_.end())
    return nullptr;
  return env;
}

}  // namespace atom
