// 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 "extensions/shell/browser/shell_content_browser_client.h"

#include <stddef.h>

#include <utility>

#include "base/command_line.h"
#include "base/macros.h"
#include "components/guest_view/browser/guest_view_message_filter.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/site_instance.h"
#include "content/public/common/content_descriptors.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/url_constants.h"
#include "content/shell/browser/shell_browser_context.h"
#include "content/shell/browser/shell_devtools_manager_delegate.h"
#include "extensions/browser/extension_message_filter.h"
#include "extensions/browser/extension_protocols.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/browser/guest_view/extensions_guest_view_message_filter.h"
#include "extensions/browser/info_map.h"
#include "extensions/browser/io_thread_extension_message_filter.h"
#include "extensions/browser/process_map.h"
#include "extensions/common/constants.h"
#include "extensions/common/extension.h"
#include "extensions/common/switches.h"
#include "extensions/shell/browser/shell_browser_context.h"
#include "extensions/shell/browser/shell_browser_main_parts.h"
#include "extensions/shell/browser/shell_extension_system.h"
#include "extensions/shell/browser/shell_speech_recognition_manager_delegate.h"
#include "url/gurl.h"

#if !defined(DISABLE_NACL)
#include "components/nacl/browser/nacl_browser.h"
#include "components/nacl/browser/nacl_host_message_filter.h"
#include "components/nacl/browser/nacl_process_host.h"
#include "components/nacl/common/nacl_process_type.h"
#include "components/nacl/common/nacl_switches.h"
#include "content/public/browser/browser_child_process_host.h"
#include "content/public/browser/child_process_data.h"
#endif

using base::CommandLine;
using content::BrowserContext;
using content::BrowserThread;

namespace extensions {
namespace {

ShellContentBrowserClient* g_instance = nullptr;

}  // namespace

ShellContentBrowserClient::ShellContentBrowserClient(
    ShellBrowserMainDelegate* browser_main_delegate)
    : browser_main_parts_(nullptr),
      browser_main_delegate_(browser_main_delegate) {
  DCHECK(!g_instance);
  g_instance = this;
}

ShellContentBrowserClient::~ShellContentBrowserClient() {
  g_instance = nullptr;
}

// static
ShellContentBrowserClient* ShellContentBrowserClient::Get() {
  return g_instance;
}

content::BrowserContext* ShellContentBrowserClient::GetBrowserContext() {
  return browser_main_parts_->browser_context();
}

content::BrowserMainParts* ShellContentBrowserClient::CreateBrowserMainParts(
    const content::MainFunctionParams& parameters) {
  browser_main_parts_ =
      CreateShellBrowserMainParts(parameters, browser_main_delegate_);
  return browser_main_parts_;
}

void ShellContentBrowserClient::RenderProcessWillLaunch(
    content::RenderProcessHost* host) {
  int render_process_id = host->GetID();
  BrowserContext* browser_context = browser_main_parts_->browser_context();
  host->AddFilter(
      new ExtensionMessageFilter(render_process_id, browser_context));
  host->AddFilter(
      new IOThreadExtensionMessageFilter(render_process_id, browser_context));
  host->AddFilter(
      new ExtensionsGuestViewMessageFilter(
          render_process_id, browser_context));
  // PluginInfoMessageFilter is not required because app_shell does not have
  // the concept of disabled plugins.
#if !defined(DISABLE_NACL)
  host->AddFilter(new nacl::NaClHostMessageFilter(
      render_process_id,
      browser_context->IsOffTheRecord(),
      browser_context->GetPath(),
      browser_context->GetRequestContextForRenderProcess(render_process_id)));
#endif
}

bool ShellContentBrowserClient::ShouldUseProcessPerSite(
    content::BrowserContext* browser_context,
    const GURL& effective_url) {
  // This ensures that all render views created for a single app will use the
  // same render process (see content::SiteInstance::GetProcess). Otherwise the
  // default behavior of ContentBrowserClient will lead to separate render
  // processes for the background page and each app window view.
  return true;
}

net::URLRequestContextGetter* ShellContentBrowserClient::CreateRequestContext(
    content::BrowserContext* content_browser_context,
    content::ProtocolHandlerMap* protocol_handlers,
    content::URLRequestInterceptorScopedVector request_interceptors) {
  // Handle only chrome-extension:// requests. app_shell does not support
  // chrome-extension-resource:// requests (it does not store shared extension
  // data in its installation directory).
  InfoMap* extension_info_map =
      browser_main_parts_->extension_system()->info_map();
  (*protocol_handlers)[kExtensionScheme] =
      linked_ptr<net::URLRequestJobFactory::ProtocolHandler>(
          CreateExtensionProtocolHandler(false /* is_incognito */,
                                         extension_info_map)
              .release());
  return browser_main_parts_->browser_context()->CreateRequestContext(
      protocol_handlers, std::move(request_interceptors), extension_info_map);
}

bool ShellContentBrowserClient::IsHandledURL(const GURL& url) {
  if (!url.is_valid())
    return false;
  // Keep in sync with ProtocolHandlers added in CreateRequestContext() and in
  // content::ShellURLRequestContextGetter::GetURLRequestContext().
  static const char* const kProtocolList[] = {
      url::kBlobScheme,
      content::kChromeDevToolsScheme,
      content::kChromeUIScheme,
      url::kDataScheme,
      url::kFileScheme,
      url::kFileSystemScheme,
      kExtensionScheme,
      kExtensionResourceScheme,
  };
  for (size_t i = 0; i < arraysize(kProtocolList); ++i) {
    if (url.scheme() == kProtocolList[i])
      return true;
  }
  return false;
}

void ShellContentBrowserClient::SiteInstanceGotProcess(
    content::SiteInstance* site_instance) {
  // If this isn't an extension renderer there's nothing to do.
  const Extension* extension = GetExtension(site_instance);
  if (!extension)
    return;

  ProcessMap::Get(browser_main_parts_->browser_context())
      ->Insert(extension->id(),
               site_instance->GetProcess()->GetID(),
               site_instance->GetId());

  BrowserThread::PostTask(
      BrowserThread::IO,
      FROM_HERE,
      base::Bind(&InfoMap::RegisterExtensionProcess,
                 browser_main_parts_->extension_system()->info_map(),
                 extension->id(),
                 site_instance->GetProcess()->GetID(),
                 site_instance->GetId()));
}

void ShellContentBrowserClient::SiteInstanceDeleting(
    content::SiteInstance* site_instance) {
  // If this isn't an extension renderer there's nothing to do.
  const Extension* extension = GetExtension(site_instance);
  if (!extension)
    return;

  ProcessMap::Get(browser_main_parts_->browser_context())
      ->Remove(extension->id(),
               site_instance->GetProcess()->GetID(),
               site_instance->GetId());

  BrowserThread::PostTask(
      BrowserThread::IO,
      FROM_HERE,
      base::Bind(&InfoMap::UnregisterExtensionProcess,
                 browser_main_parts_->extension_system()->info_map(),
                 extension->id(),
                 site_instance->GetProcess()->GetID(),
                 site_instance->GetId()));
}

void ShellContentBrowserClient::AppendExtraCommandLineSwitches(
    base::CommandLine* command_line,
    int child_process_id) {
  std::string process_type =
      command_line->GetSwitchValueASCII(::switches::kProcessType);
  if (process_type == ::switches::kRendererProcess)
    AppendRendererSwitches(command_line);
}

content::SpeechRecognitionManagerDelegate*
ShellContentBrowserClient::CreateSpeechRecognitionManagerDelegate() {
  return new speech::ShellSpeechRecognitionManagerDelegate();
}

content::BrowserPpapiHost*
ShellContentBrowserClient::GetExternalBrowserPpapiHost(int plugin_process_id) {
#if !defined(DISABLE_NACL)
  content::BrowserChildProcessHostIterator iter(PROCESS_TYPE_NACL_LOADER);
  while (!iter.Done()) {
    nacl::NaClProcessHost* host = static_cast<nacl::NaClProcessHost*>(
        iter.GetDelegate());
    if (host->process() &&
        host->process()->GetData().id == plugin_process_id) {
      // Found the plugin.
      return host->browser_ppapi_host();
    }
    ++iter;
  }
#endif
  return nullptr;
}

void ShellContentBrowserClient::GetAdditionalAllowedSchemesForFileSystem(
    std::vector<std::string>* additional_allowed_schemes) {
  ContentBrowserClient::GetAdditionalAllowedSchemesForFileSystem(
      additional_allowed_schemes);
  additional_allowed_schemes->push_back(kExtensionScheme);
}

content::DevToolsManagerDelegate*
ShellContentBrowserClient::GetDevToolsManagerDelegate() {
  return new content::ShellDevToolsManagerDelegate();
}

ShellBrowserMainParts* ShellContentBrowserClient::CreateShellBrowserMainParts(
    const content::MainFunctionParams& parameters,
    ShellBrowserMainDelegate* browser_main_delegate) {
  return new ShellBrowserMainParts(parameters, browser_main_delegate);
}

void ShellContentBrowserClient::AppendRendererSwitches(
    base::CommandLine* command_line) {
  // TODO(jamescook): Should we check here if the process is in the extension
  // service process map, or can we assume all renderers are extension
  // renderers?
  command_line->AppendSwitch(switches::kExtensionProcess);

#if !defined(DISABLE_NACL)
  // NOTE: app_shell does not support non-SFI mode, so it does not pass through
  // SFI switches either here or for the zygote process.
  static const char* const kSwitchNames[] = {
    ::switches::kEnableNaClDebug,
  };
  command_line->CopySwitchesFrom(*base::CommandLine::ForCurrentProcess(),
                                 kSwitchNames, arraysize(kSwitchNames));
#endif  // !defined(DISABLE_NACL)
}

const Extension* ShellContentBrowserClient::GetExtension(
    content::SiteInstance* site_instance) {
  ExtensionRegistry* registry =
      ExtensionRegistry::Get(site_instance->GetBrowserContext());
  return registry->enabled_extensions().GetExtensionOrAppByURL(
      site_instance->GetSiteURL());
}

}  // namespace extensions