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feature_switch.cc
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feature_switch.cc
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// Copyright 2013 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/common/feature_switch.h"
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/metrics/field_trial.h"
#include "base/strings/string_util.h"
#include "build/build_config.h"
#include "extensions/common/switches.h"
namespace extensions {
namespace {
// The switch media-router is defined in chrome/common/chrome_switches.cc, but
// we can't depend on chrome here.
const char kMediaRouterFlag[] = "media-router";
const char kEnableMediaRouterExperiment[] = "EnableMediaRouter";
const char kExtensionActionRedesignExperiment[] = "ExtensionActionRedesign";
class CommonSwitches {
public:
CommonSwitches()
: easy_off_store_install(nullptr, FeatureSwitch::DEFAULT_DISABLED),
force_dev_mode_highlighting(switches::kForceDevModeHighlighting,
FeatureSwitch::DEFAULT_DISABLED),
prompt_for_external_extensions(
#if defined(CHROMIUM_BUILD)
switches::kPromptForExternalExtensions,
#else
nullptr,
#endif
#if defined(OS_WIN)
FeatureSwitch::DEFAULT_ENABLED),
#else
FeatureSwitch::DEFAULT_DISABLED),
#endif
error_console(switches::kErrorConsole, FeatureSwitch::DEFAULT_DISABLED),
enable_override_bookmarks_ui(switches::kEnableOverrideBookmarksUI,
FeatureSwitch::DEFAULT_DISABLED),
extension_action_redesign(switches::kExtensionActionRedesign,
kExtensionActionRedesignExperiment,
FeatureSwitch::DEFAULT_ENABLED),
scripts_require_action(switches::kScriptsRequireAction,
FeatureSwitch::DEFAULT_DISABLED),
embedded_extension_options(switches::kEmbeddedExtensionOptions,
FeatureSwitch::DEFAULT_DISABLED),
trace_app_source(switches::kTraceAppSource,
FeatureSwitch::DEFAULT_ENABLED),
media_router(kMediaRouterFlag,
kEnableMediaRouterExperiment,
FeatureSwitch::DEFAULT_ENABLED) {
}
// Enables extensions to be easily installed from sites other than the web
// store.
FeatureSwitch easy_off_store_install;
FeatureSwitch force_dev_mode_highlighting;
// Should we prompt the user before allowing external extensions to install?
// Default is yes.
FeatureSwitch prompt_for_external_extensions;
FeatureSwitch error_console;
FeatureSwitch enable_override_bookmarks_ui;
FeatureSwitch extension_action_redesign;
FeatureSwitch scripts_require_action;
FeatureSwitch embedded_extension_options;
FeatureSwitch trace_app_source;
FeatureSwitch media_router;
};
base::LazyInstance<CommonSwitches> g_common_switches =
LAZY_INSTANCE_INITIALIZER;
} // namespace
FeatureSwitch* FeatureSwitch::force_dev_mode_highlighting() {
return &g_common_switches.Get().force_dev_mode_highlighting;
}
FeatureSwitch* FeatureSwitch::easy_off_store_install() {
return &g_common_switches.Get().easy_off_store_install;
}
FeatureSwitch* FeatureSwitch::prompt_for_external_extensions() {
return &g_common_switches.Get().prompt_for_external_extensions;
}
FeatureSwitch* FeatureSwitch::error_console() {
return &g_common_switches.Get().error_console;
}
FeatureSwitch* FeatureSwitch::enable_override_bookmarks_ui() {
return &g_common_switches.Get().enable_override_bookmarks_ui;
}
FeatureSwitch* FeatureSwitch::extension_action_redesign() {
return &g_common_switches.Get().extension_action_redesign;
}
FeatureSwitch* FeatureSwitch::scripts_require_action() {
return &g_common_switches.Get().scripts_require_action;
}
FeatureSwitch* FeatureSwitch::embedded_extension_options() {
return &g_common_switches.Get().embedded_extension_options;
}
FeatureSwitch* FeatureSwitch::trace_app_source() {
return &g_common_switches.Get().trace_app_source;
}
FeatureSwitch* FeatureSwitch::media_router() {
return &g_common_switches.Get().media_router;
}
FeatureSwitch::ScopedOverride::ScopedOverride(FeatureSwitch* feature,
bool override_value)
: feature_(feature),
previous_value_(feature->GetOverrideValue()) {
feature_->SetOverrideValue(
override_value ? OVERRIDE_ENABLED : OVERRIDE_DISABLED);
}
FeatureSwitch::ScopedOverride::~ScopedOverride() {
feature_->SetOverrideValue(previous_value_);
}
FeatureSwitch::FeatureSwitch(const char* switch_name,
DefaultValue default_value)
: FeatureSwitch(base::CommandLine::ForCurrentProcess(),
switch_name,
default_value) {}
FeatureSwitch::FeatureSwitch(const char* switch_name,
const char* field_trial_name,
DefaultValue default_value)
: FeatureSwitch(base::CommandLine::ForCurrentProcess(),
switch_name,
field_trial_name,
default_value) {}
FeatureSwitch::FeatureSwitch(const base::CommandLine* command_line,
const char* switch_name,
DefaultValue default_value)
: FeatureSwitch(command_line, switch_name, nullptr, default_value) {}
FeatureSwitch::FeatureSwitch(const base::CommandLine* command_line,
const char* switch_name,
const char* field_trial_name,
DefaultValue default_value)
: command_line_(command_line),
switch_name_(switch_name),
field_trial_name_(field_trial_name),
default_value_(default_value == DEFAULT_ENABLED),
override_value_(OVERRIDE_NONE) {}
bool FeatureSwitch::IsEnabled() const {
if (override_value_ != OVERRIDE_NONE)
return override_value_ == OVERRIDE_ENABLED;
if (!switch_name_)
return default_value_;
std::string temp = command_line_->GetSwitchValueASCII(switch_name_);
std::string switch_value;
base::TrimWhitespaceASCII(temp, base::TRIM_ALL, &switch_value);
if (switch_value == "1")
return true;
if (switch_value == "0")
return false;
// TODO(imcheng): Don't check |default_value_|. Otherwise, we could improperly
// ignore an enable/disable switch if there is a field trial active.
// crbug.com/585569
if (!default_value_ && command_line_->HasSwitch(GetLegacyEnableFlag()))
return true;
if (default_value_ && command_line_->HasSwitch(GetLegacyDisableFlag()))
return false;
if (field_trial_name_) {
std::string group_name =
base::FieldTrialList::FindFullName(field_trial_name_);
if (base::StartsWith(group_name, "Enabled", base::CompareCase::SENSITIVE))
return true;
if (base::StartsWith(group_name, "Disabled", base::CompareCase::SENSITIVE))
return false;
}
return default_value_;
}
std::string FeatureSwitch::GetLegacyEnableFlag() const {
DCHECK(switch_name_);
return std::string("enable-") + switch_name_;
}
std::string FeatureSwitch::GetLegacyDisableFlag() const {
DCHECK(switch_name_);
return std::string("disable-") + switch_name_;
}
void FeatureSwitch::SetOverrideValue(OverrideValue override_value) {
override_value_ = override_value;
}
FeatureSwitch::OverrideValue FeatureSwitch::GetOverrideValue() const {
return override_value_;
}
} // namespace extensions