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cef/libcef/browser/prefs/renderer_prefs.cc
Marshall Greenblatt 48fc0bd220 Make CefBrowserContext an abstract base class (see issue #2969) 
Existing CefBrowserContext functionality is now split between
CefBrowserContext and AlloyBrowserContext. Runtime implementations of
CefBrowserContext will provide access to the content::BrowserContext and
Profile types via different inheritance paths. For example, the Alloy
runtime uses ChromeProfileAlloy and the Chrome runtime uses ProfileImpl.

This change also renames CefResourceContext to CefIOThreadState to more
accurately represent its purpose as it no longer needs to extend
content::ResourceContext.
2020-07-01 15:35:07 -04:00

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// Copyright (c) 2010 The Chromium Embedded Framework 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 "libcef/browser/prefs/renderer_prefs.h"
#include <string>
#include "libcef/browser/context.h"
#include "libcef/browser/extensions/browser_extensions_util.h"
#include "libcef/common/cef_switches.h"
#include "libcef/common/extensions/extensions_util.h"
#include "base/command_line.h"
#include "base/i18n/character_encoding.h"
#include "base/memory/ptr_util.h"
#include "base/values.h"
#include "chrome/browser/accessibility/animation_policy_prefs.h"
#include "chrome/browser/defaults.h"
#include "chrome/browser/extensions/extension_webkit_preferences.h"
#include "chrome/browser/font_family_cache.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/prefs/prefs_tab_helper.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/pref_names.h"
#include "components/pref_registry/pref_registry_syncable.h"
#include "components/prefs/command_line_pref_store.h"
#include "components/prefs/pref_service.h"
#include "components/prefs/pref_store.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/site_instance.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/web_preferences.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/browser/view_type_utils.h"
#include "extensions/common/constants.h"
#include "media/media_buildflags.h"
#include "third_party/blink/public/common/peerconnection/webrtc_ip_handling_policy.h"
namespace renderer_prefs {
namespace {
// Set default values based on CEF command-line flags for preferences that are
// not available via the PrefService. Chromium command-line flags should not
// exist for these preferences.
void SetDefaultPrefs(content::WebPreferences& web) {
const base::CommandLine* command_line =
base::CommandLine::ForCurrentProcess();
web.javascript_enabled =
!command_line->HasSwitch(switches::kDisableJavascript);
web.allow_scripts_to_close_windows =
!command_line->HasSwitch(switches::kDisableJavascriptCloseWindows);
web.javascript_can_access_clipboard =
!command_line->HasSwitch(switches::kDisableJavascriptAccessClipboard);
web.allow_universal_access_from_file_urls =
command_line->HasSwitch(switches::kAllowUniversalAccessFromFileUrls);
web.shrinks_standalone_images_to_fit =
command_line->HasSwitch(switches::kImageShrinkStandaloneToFit);
web.text_areas_are_resizable =
!command_line->HasSwitch(switches::kDisableTextAreaResize);
}
// Chrome preferences.
// Should match ChromeContentBrowserClient::OverrideWebkitPrefs.
void SetChromePrefs(Profile* profile, content::WebPreferences& web) {
PrefService* prefs = profile->GetPrefs();
// Fill per-script font preferences.
FontFamilyCache::FillFontFamilyMap(profile,
prefs::kWebKitStandardFontFamilyMap,
&web.standard_font_family_map);
FontFamilyCache::FillFontFamilyMap(profile, prefs::kWebKitFixedFontFamilyMap,
&web.fixed_font_family_map);
FontFamilyCache::FillFontFamilyMap(profile, prefs::kWebKitSerifFontFamilyMap,
&web.serif_font_family_map);
FontFamilyCache::FillFontFamilyMap(profile,
prefs::kWebKitSansSerifFontFamilyMap,
&web.sans_serif_font_family_map);
FontFamilyCache::FillFontFamilyMap(profile,
prefs::kWebKitCursiveFontFamilyMap,
&web.cursive_font_family_map);
FontFamilyCache::FillFontFamilyMap(profile,
prefs::kWebKitFantasyFontFamilyMap,
&web.fantasy_font_family_map);
FontFamilyCache::FillFontFamilyMap(profile,
prefs::kWebKitPictographFontFamilyMap,
&web.pictograph_font_family_map);
web.default_font_size = prefs->GetInteger(prefs::kWebKitDefaultFontSize);
web.default_fixed_font_size =
prefs->GetInteger(prefs::kWebKitDefaultFixedFontSize);
web.minimum_font_size = prefs->GetInteger(prefs::kWebKitMinimumFontSize);
web.minimum_logical_font_size =
prefs->GetInteger(prefs::kWebKitMinimumLogicalFontSize);
web.default_encoding = prefs->GetString(prefs::kDefaultCharset);
web.dom_paste_enabled = prefs->GetBoolean(prefs::kWebKitDomPasteEnabled);
web.tabs_to_links = prefs->GetBoolean(prefs::kWebkitTabsToLinks);
if (!prefs->GetBoolean(prefs::kWebKitJavascriptEnabled))
web.javascript_enabled = false;
if (!prefs->GetBoolean(prefs::kWebKitWebSecurityEnabled))
web.web_security_enabled = false;
if (!prefs->GetBoolean(prefs::kWebKitPluginsEnabled))
web.plugins_enabled = false;
web.loads_images_automatically =
prefs->GetBoolean(prefs::kWebKitLoadsImagesAutomatically);
if (prefs->GetBoolean(prefs::kDisable3DAPIs)) {
web.webgl1_enabled = false;
web.webgl2_enabled = false;
}
web.allow_running_insecure_content =
prefs->GetBoolean(prefs::kWebKitAllowRunningInsecureContent);
web.password_echo_enabled = browser_defaults::kPasswordEchoEnabled;
web.text_areas_are_resizable =
prefs->GetBoolean(prefs::kWebKitTextAreasAreResizable);
web.hyperlink_auditing_enabled =
prefs->GetBoolean(prefs::kEnableHyperlinkAuditing);
if (extensions::ExtensionsEnabled()) {
std::string image_animation_policy =
prefs->GetString(prefs::kAnimationPolicy);
if (image_animation_policy == kAnimationPolicyOnce)
web.animation_policy = content::IMAGE_ANIMATION_POLICY_ANIMATION_ONCE;
else if (image_animation_policy == kAnimationPolicyNone)
web.animation_policy = content::IMAGE_ANIMATION_POLICY_NO_ANIMATION;
else
web.animation_policy = content::IMAGE_ANIMATION_POLICY_ALLOWED;
}
// Make sure we will set the default_encoding with canonical encoding name.
web.default_encoding =
base::GetCanonicalEncodingNameByAliasName(web.default_encoding);
if (web.default_encoding.empty()) {
prefs->ClearPref(prefs::kDefaultCharset);
web.default_encoding = prefs->GetString(prefs::kDefaultCharset);
}
DCHECK(!web.default_encoding.empty());
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnablePotentiallyAnnoyingSecurityFeatures)) {
web.disable_reading_from_canvas = true;
web.strict_mixed_content_checking = true;
web.strict_powerful_feature_restrictions = true;
}
}
// Extension preferences.
// Should match ChromeContentBrowserClientExtensionsPart::OverrideWebkitPrefs.
void SetExtensionPrefs(content::RenderViewHost* rvh,
content::WebPreferences& web) {
if (!extensions::ExtensionsEnabled())
return;
const extensions::ExtensionRegistry* registry =
extensions::ExtensionRegistry::Get(
rvh->GetProcess()->GetBrowserContext());
if (!registry)
return;
// Note: it's not possible for kExtensionsScheme to change during the lifetime
// of the process.
//
// Ensure that we are only granting extension preferences to URLs with the
// correct scheme. Without this check, chrome-guest:// schemes used by webview
// tags as well as hosts that happen to match the id of an installed extension
// would get the wrong preferences.
const GURL& site_url = rvh->GetSiteInstance()->GetSiteURL();
if (!site_url.SchemeIs(extensions::kExtensionScheme))
return;
content::WebContents* web_contents =
content::WebContents::FromRenderViewHost(rvh);
extensions::ViewType view_type = extensions::GetViewType(web_contents);
const extensions::Extension* extension =
registry->enabled_extensions().GetByID(site_url.host());
extension_webkit_preferences::SetPreferences(extension, view_type, &web);
}
// Helper macro for setting a WebPreferences variable based on the value of a
// CefBrowserSettings variable.
#define SET_STATE(cef_var, web_var) \
if (cef_var == STATE_ENABLED) \
web_var = true; \
else if (cef_var == STATE_DISABLED) \
web_var = false;
// Set preferences based on CefBrowserSettings.
void SetCefPrefs(const CefBrowserSettings& cef, content::WebPreferences& web) {
if (cef.standard_font_family.length > 0) {
web.standard_font_family_map[content::kCommonScript] =
CefString(&cef.standard_font_family);
}
if (cef.fixed_font_family.length > 0) {
web.fixed_font_family_map[content::kCommonScript] =
CefString(&cef.fixed_font_family);
}
if (cef.serif_font_family.length > 0) {
web.serif_font_family_map[content::kCommonScript] =
CefString(&cef.serif_font_family);
}
if (cef.sans_serif_font_family.length > 0) {
web.sans_serif_font_family_map[content::kCommonScript] =
CefString(&cef.sans_serif_font_family);
}
if (cef.cursive_font_family.length > 0) {
web.cursive_font_family_map[content::kCommonScript] =
CefString(&cef.cursive_font_family);
}
if (cef.fantasy_font_family.length > 0) {
web.fantasy_font_family_map[content::kCommonScript] =
CefString(&cef.fantasy_font_family);
}
if (cef.default_font_size > 0)
web.default_font_size = cef.default_font_size;
if (cef.default_fixed_font_size > 0)
web.default_fixed_font_size = cef.default_fixed_font_size;
if (cef.minimum_font_size > 0)
web.minimum_font_size = cef.minimum_font_size;
if (cef.minimum_logical_font_size > 0)
web.minimum_logical_font_size = cef.minimum_logical_font_size;
if (cef.default_encoding.length > 0)
web.default_encoding = CefString(&cef.default_encoding);
SET_STATE(cef.remote_fonts, web.remote_fonts_enabled);
SET_STATE(cef.javascript, web.javascript_enabled);
SET_STATE(cef.javascript_close_windows, web.allow_scripts_to_close_windows);
SET_STATE(cef.javascript_access_clipboard,
web.javascript_can_access_clipboard);
SET_STATE(cef.javascript_dom_paste, web.dom_paste_enabled);
SET_STATE(cef.plugins, web.plugins_enabled);
SET_STATE(cef.universal_access_from_file_urls,
web.allow_universal_access_from_file_urls);
SET_STATE(cef.file_access_from_file_urls,
web.allow_file_access_from_file_urls);
SET_STATE(cef.web_security, web.web_security_enabled);
SET_STATE(cef.image_loading, web.loads_images_automatically);
SET_STATE(cef.image_shrink_standalone_to_fit,
web.shrinks_standalone_images_to_fit);
SET_STATE(cef.text_area_resize, web.text_areas_are_resizable);
SET_STATE(cef.tab_to_links, web.tabs_to_links);
SET_STATE(cef.local_storage, web.local_storage_enabled);
SET_STATE(cef.databases, web.databases_enabled);
SET_STATE(cef.application_cache, web.application_cache_enabled);
// Never explicitly enable GPU-related functions in this method because the
// GPU blacklist is not being checked here.
if (cef.webgl == STATE_DISABLED) {
web.webgl1_enabled = false;
web.webgl2_enabled = false;
}
}
void SetString(CommandLinePrefStore* prefs,
const std::string& key,
const std::string& value) {
prefs->SetValue(key, base::WrapUnique(new base::Value(value)),
WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS);
}
void SetBool(CommandLinePrefStore* prefs, const std::string& key, bool value) {
prefs->SetValue(key, base::WrapUnique(new base::Value(value)),
WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS);
}
} // namespace
void SetCommandLinePrefDefaults(CommandLinePrefStore* prefs) {
const base::CommandLine* command_line =
base::CommandLine::ForCurrentProcess();
if (command_line->HasSwitch(switches::kDefaultEncoding)) {
SetString(prefs, prefs::kDefaultCharset,
command_line->GetSwitchValueASCII(switches::kDefaultEncoding));
}
if (command_line->HasSwitch(switches::kDisableJavascriptDomPaste))
SetBool(prefs, prefs::kWebKitDomPasteEnabled, false);
if (command_line->HasSwitch(switches::kDisableImageLoading))
SetBool(prefs, prefs::kWebKitLoadsImagesAutomatically, false);
if (command_line->HasSwitch(switches::kDisableTabToLinks))
SetBool(prefs, prefs::kWebkitTabsToLinks, false);
if (command_line->HasSwitch(switches::kDisablePlugins))
SetBool(prefs, prefs::kWebKitPluginsEnabled, false);
}
void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry,
const std::string& locale) {
PrefsTabHelper::RegisterProfilePrefs(registry, locale);
RegisterAnimationPolicyPrefs(registry);
// From chrome::RegisterBrowserUserPrefs.
registry->RegisterBooleanPref(
prefs::kEnableDoNotTrack, false,
user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
// TODO(guoweis): Remove next 2 options at M50.
registry->RegisterBooleanPref(prefs::kWebRTCMultipleRoutesEnabled, true);
registry->RegisterBooleanPref(prefs::kWebRTCNonProxiedUdpEnabled, true);
registry->RegisterStringPref(prefs::kWebRTCIPHandlingPolicy,
blink::kWebRTCIPHandlingDefault);
registry->RegisterStringPref(prefs::kWebRTCUDPPortRange, std::string());
#if !defined(OS_MACOSX)
registry->RegisterBooleanPref(prefs::kFullscreenAllowed, true);
#endif
// From ChromeContentBrowserClient::RegisterProfilePrefs.
registry->RegisterBooleanPref(prefs::kDisable3DAPIs, false);
registry->RegisterBooleanPref(prefs::kEnableHyperlinkAuditing, true);
// From Profile::RegisterProfilePrefs.
registry->RegisterDictionaryPref(prefs::kPartitionDefaultZoomLevel);
registry->RegisterDictionaryPref(prefs::kPartitionPerHostZoomLevels);
}
void PopulateWebPreferences(content::RenderViewHost* rvh,
content::WebPreferences& web) {
CefRefPtr<CefBrowserHostImpl> browser =
extensions::GetOwnerBrowserForHost(rvh, nullptr);
// Set defaults for preferences that are not handled by PrefService.
SetDefaultPrefs(web);
// Set preferences based on the context's PrefService.
if (browser) {
auto profile = Profile::FromBrowserContext(
browser->web_contents()->GetBrowserContext());
SetChromePrefs(profile, web);
}
// Set preferences based on the extension.
SetExtensionPrefs(rvh, web);
if (browser) {
// Set preferences based on CefBrowserSettings.
SetCefPrefs(browser->settings(), web);
web.picture_in_picture_enabled = browser->IsPictureInPictureSupported();
// Set the background color for the WebView.
web.base_background_color = browser->GetBackgroundColor();
} else {
// We don't know for sure that the browser will be windowless but assume
// that the global windowless state is likely to be accurate.
web.base_background_color =
CefContext::Get()->GetBackgroundColor(nullptr, STATE_DEFAULT);
}
}
} // namespace renderer_prefs
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