components/subresource_redirect/common/subresource_redirect_features.cc

// Copyright 2021 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 "components/subresource_redirect/common/subresource_redirect_features.h"

#include "base/metrics/field_trial_params.h"
#include "third_party/blink/public/common/features.h"

namespace subresource_redirect {

namespace {

bool IsSubresourceRedirectEnabled() {
  return base::FeatureList::IsEnabled(blink::features::kSubresourceRedirect);
}

}  // namespace

bool ShouldEnablePublicImageHintsBasedCompression() {
  bool is_enabled = IsSubresourceRedirectEnabled() &&
                    base::GetFieldTrialParamByFeatureAsBool(
                        blink::features::kSubresourceRedirect,
                        "enable_public_image_hints_based_compression", true);
  // Only one of the public image hints or login and robots based image
  // compression should be active.
  DCHECK(!is_enabled || !ShouldEnableLoginRobotsCheckedCompression());
  return is_enabled;
}

bool ShouldEnableLoginRobotsCheckedCompression() {
  bool is_enabled = IsSubresourceRedirectEnabled() &&
                    base::GetFieldTrialParamByFeatureAsBool(
                        blink::features::kSubresourceRedirect,
                        "enable_login_robots_based_compression", false);
  // Only one of the public image hints or login and robots based image
  // compression should be active.
  DCHECK(!is_enabled || !ShouldEnablePublicImageHintsBasedCompression());
  return is_enabled;
}

// Should the subresource be redirected to its compressed version. This returns
// false if only coverage metrics need to be recorded and actual redirection
// should not happen.
bool ShouldCompressRedirectSubresource() {
  return base::FeatureList::IsEnabled(blink::features::kSubresourceRedirect) &&
         base::GetFieldTrialParamByFeatureAsBool(
             blink::features::kSubresourceRedirect,
             "enable_subresource_server_redirect", true);
}

}  // namespace subresource_redirect