Source/core/fetch/ClientHintsPreferences.cpp

// Copyright 2015 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 "config.h"
#include "core/fetch/ClientHintsPreferences.h"

#include "core/fetch/ResourceFetcher.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "platform/network/HTTPParsers.h"

namespace blink {

ClientHintsPreferences::ClientHintsPreferences()
    : m_shouldSendDPR(false)
    , m_shouldSendResourceWidth(false)
    , m_shouldSendViewportWidth(false)
{
}

void ClientHintsPreferences::updateFrom(const ClientHintsPreferences& preferences)
{
    m_shouldSendDPR = preferences.m_shouldSendDPR;
    m_shouldSendResourceWidth = preferences.m_shouldSendResourceWidth;
    m_shouldSendViewportWidth = preferences.m_shouldSendViewportWidth;
}

void ClientHintsPreferences::updateFromAcceptClientHintsHeader(const String& headerValue, ResourceFetcher* fetcher)
{
    if (!RuntimeEnabledFeatures::clientHintsEnabled() || headerValue.isEmpty())
        return;

    CommaDelimitedHeaderSet acceptClientHintsHeader;
    parseCommaDelimitedHeader(headerValue, acceptClientHintsHeader);
    if (acceptClientHintsHeader.contains("dpr")) {
        if (fetcher)
            fetcher->context().countClientHintsDPR();
        m_shouldSendDPR = true;
    }

    if (acceptClientHintsHeader.contains("width")) {
        if (fetcher)
            fetcher->context().countClientHintsResourceWidth();
        m_shouldSendResourceWidth = true;
    }

    if (acceptClientHintsHeader.contains("viewport-width")) {
        if (fetcher)
            fetcher->context().countClientHintsViewportWidth();
        m_shouldSendViewportWidth = true;
    }
}

}