electron/atom/browser/web_contents_preferences.cc

// Copyright (c) 2015 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include "atom/browser/web_contents_preferences.h"

#include <string>

#include "atom/common/options_switches.h"
#include "base/command_line.h"
#include "base/strings/string_number_conversions.h"
#include "content/public/common/web_preferences.h"
#include "net/base/filename_util.h"

#if defined(OS_WIN)
#include "ui/gfx/switches.h"
#endif

namespace atom {

namespace {

// Pointer as WebContents's user data key.
const char* kWebPreferencesKey = "WebContentsPreferences";

// Array of available web runtime features.
const char* kWebRuntimeFeatures[] = {
  switches::kExperimentalFeatures,
  switches::kExperimentalCanvasFeatures,
  switches::kSubpixelFontScaling,
  switches::kOverlayScrollbars,
  switches::kOverlayFullscreenVideo,
  switches::kSharedWorker,
  switches::kPageVisibility,
};

}  // namespace

WebContentsPreferences::WebContentsPreferences(
    content::WebContents* web_contents,
    base::DictionaryValue* web_preferences) {
  web_preferences_.Swap(web_preferences);
  web_contents->SetUserData(kWebPreferencesKey, this);
}

WebContentsPreferences::~WebContentsPreferences() {
}

void WebContentsPreferences::Merge(const base::DictionaryValue& extend) {
  web_preferences_.MergeDictionary(&extend);
}

// static
WebContentsPreferences* WebContentsPreferences::From(
    content::WebContents* web_contents) {
  return static_cast<WebContentsPreferences*>(
      web_contents->GetUserData(kWebPreferencesKey));
}

// static
void WebContentsPreferences::AppendExtraCommandLineSwitches(
    content::WebContents* web_contents, base::CommandLine* command_line) {
  WebContentsPreferences* self = From(web_contents);
  if (!self)
    return;

  base::DictionaryValue& web_preferences = self->web_preferences_;

  bool b;
#if defined(OS_WIN)
  // Check if DirectWrite is disabled.
  if (web_preferences.GetBoolean(switches::kDirectWrite, &b) && !b)
    command_line->AppendSwitch(::switches::kDisableDirectWrite);
#endif

  // Check if plugins are enabled.
  if (web_preferences.GetBoolean("plugins", &b) && b)
    command_line->AppendSwitch(switches::kEnablePlugins);

  // This set of options are not availabe in WebPreferences, so we have to pass
  // them via command line and enable them in renderer procss.
  for (size_t i = 0; i < arraysize(kWebRuntimeFeatures); ++i) {
    const char* feature = kWebRuntimeFeatures[i];
    if (web_preferences.GetBoolean(feature, &b))
      command_line->AppendSwitchASCII(feature, b ? "true" : "false");
  }

  // Check if we have node integration specified.
  bool node_integration = true;
  web_preferences.GetBoolean(switches::kNodeIntegration, &node_integration);
  // Be compatible with old API of "node-integration" option.
  std::string old_token;
  if (web_preferences.GetString(switches::kNodeIntegration, &old_token) &&
      old_token != "disable")
    node_integration = true;
  command_line->AppendSwitchASCII(switches::kNodeIntegration,
                                  node_integration ? "true" : "false");

  // The preload script.
  base::FilePath::StringType preload;
  if (web_preferences.GetString(switches::kPreloadScript, &preload)) {
    if (base::FilePath(preload).IsAbsolute())
      command_line->AppendSwitchNative(switches::kPreloadScript, preload);
    else
      LOG(ERROR) << "preload script must have abosulute path.";
  } else if (web_preferences.GetString(switches::kPreloadUrl, &preload)) {
    // Translate to file path if there is "preload-url" option.
    base::FilePath preload_path;
    if (net::FileURLToFilePath(GURL(preload), &preload_path))
      command_line->AppendSwitchPath(switches::kPreloadScript, preload_path);
    else
      LOG(ERROR) << "preload url must be file:// protocol.";
  }

  // The zoom factor.
  double zoom_factor = 1.0;
  if (web_preferences.GetDouble(switches::kZoomFactor, &zoom_factor) &&
      zoom_factor != 1.0)
    command_line->AppendSwitchASCII(switches::kZoomFactor,
                                    base::DoubleToString(zoom_factor));

  // --guest-instance-id, which is used to identify guest WebContents.
  int guest_instance_id;
  if (web_preferences.GetInteger(switches::kGuestInstanceID,
                                 &guest_instance_id))
      command_line->AppendSwitchASCII(switches::kGuestInstanceID,
                                      base::IntToString(guest_instance_id));
}

// static
void WebContentsPreferences::OverrideWebkitPrefs(
    content::WebContents* web_contents, content::WebPreferences* prefs) {
  WebContentsPreferences* self = From(web_contents);
  if (!self)
    return;

  bool b;
  if (self->web_preferences_.GetBoolean("javascript", &b))
    prefs->javascript_enabled = b;
  if (self->web_preferences_.GetBoolean("images", &b))
    prefs->images_enabled = b;
  if (self->web_preferences_.GetBoolean("java", &b))
    prefs->java_enabled = b;
  if (self->web_preferences_.GetBoolean("text-areas-are-resizable", &b))
    prefs->text_areas_are_resizable = b;
  if (self->web_preferences_.GetBoolean("webgl", &b))
    prefs->experimental_webgl_enabled = b;
  if (self->web_preferences_.GetBoolean("webaudio", &b))
    prefs->webaudio_enabled = b;
  if (self->web_preferences_.GetBoolean("web-security", &b)) {
    prefs->web_security_enabled = b;
    prefs->allow_displaying_insecure_content = !b;
    prefs->allow_running_insecure_content = !b;
  }
  if (self->web_preferences_.GetBoolean("allow-displaying-insecure-content",
                                        &b))
    prefs->allow_displaying_insecure_content = b;
  if (self->web_preferences_.GetBoolean("allow-running-insecure-content", &b))
    prefs->allow_running_insecure_content = b;
}

}  // namespace atom