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// Copyright 2013 The Chromium Authors
// 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/strings/string_util.h"
#include "build/build_config.h"
#include "extensions/common/switches.h"
namespace extensions {
namespace {
class CommonSwitches {
public:
CommonSwitches()
: // Intentionally no flag since turning this off outside of tests
// is a security risk.
prompt_for_external_extensions(nullptr,
#if BUILDFLAG(IS_WIN) || BUILDFLAG(IS_MAC)
FeatureSwitch::DEFAULT_ENABLED),
#else
FeatureSwitch::DEFAULT_DISABLED),
#endif
embedded_extension_options(switches::kEmbeddedExtensionOptions,
FeatureSwitch::DEFAULT_DISABLED),
trace_app_source(switches::kTraceAppSource,
FeatureSwitch::DEFAULT_ENABLED) {
}
// Should we prompt the user before allowing external extensions to install?
// Default is yes.
FeatureSwitch prompt_for_external_extensions;
FeatureSwitch embedded_extension_options;
FeatureSwitch trace_app_source;
};
base::LazyInstance<CommonSwitches>::DestructorAtExit g_common_switches =
LAZY_INSTANCE_INITIALIZER;
} // namespace
FeatureSwitch* FeatureSwitch::prompt_for_external_extensions() {
return &g_common_switches.Get().prompt_for_external_extensions;
}
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::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 base::CommandLine* command_line,
const char* switch_name,
DefaultValue default_value)
: command_line_(command_line),
switch_name_(switch_name),
default_value_(default_value == DEFAULT_ENABLED),
override_value_(OVERRIDE_NONE) {}
FeatureSwitch::~FeatureSwitch() = default;
bool FeatureSwitch::IsEnabled() const {
if (override_value_ != OVERRIDE_NONE)
return override_value_ == OVERRIDE_ENABLED;
if (!cached_value_.has_value())
cached_value_ = ComputeValue();
return cached_value_.value();
}
bool FeatureSwitch::ComputeValue() const {
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;
if (command_line_->HasSwitch(GetLegacyEnableFlag()))
return true;
if (command_line_->HasSwitch(GetLegacyDisableFlag()))
return false;
return default_value_;
}
bool FeatureSwitch::HasValue() const {
return override_value_ != OVERRIDE_NONE ||
command_line_->HasSwitch(switch_name_) ||
command_line_->HasSwitch(GetLegacyEnableFlag()) ||
command_line_->HasSwitch(GetLegacyDisableFlag());
}
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
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