third_party/WebKit/Source/core/fetch/ClientHintsPreferences.cpp

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "config.h"
   6 #include "core/fetch/ClientHintsPreferences.h"
   7
   8 #include "core/fetch/ResourceFetcher.h"
   9 #include "platform/RuntimeEnabledFeatures.h"
  10 #include "platform/network/HTTPParsers.h"
  11
  12 namespace blink {
  13
  14 ClientHintsPreferences::ClientHintsPreferences()
  15     : m_shouldSendDPR(false)
  16     , m_shouldSendResourceWidth(false)
  17     , m_shouldSendViewportWidth(false)
  18 {
  19 }
  20
  21 void ClientHintsPreferences::updateFrom(const ClientHintsPreferences& preferences)
  22 {
  23     m_shouldSendDPR = preferences.m_shouldSendDPR;
  24     m_shouldSendResourceWidth = preferences.m_shouldSendResourceWidth;
  25     m_shouldSendViewportWidth = preferences.m_shouldSendViewportWidth;
  26 }
  27
  28 void ClientHintsPreferences::updateFromAcceptClientHintsHeader(const String& headerValue, ResourceFetcher* fetcher)
  29 {
  30     if (!RuntimeEnabledFeatures::clientHintsEnabled() || headerValue.isEmpty())
  31         return;
  32
  33     CommaDelimitedHeaderSet acceptClientHintsHeader;
  34     parseCommaDelimitedHeader(headerValue, acceptClientHintsHeader);
  35     if (acceptClientHintsHeader.contains("dpr")) {
  36         if (fetcher)
  37             fetcher->context().countClientHintsDPR();
  38         m_shouldSendDPR = true;
  39     }
  40
  41     if (acceptClientHintsHeader.contains("width")) {
  42         if (fetcher)
  43             fetcher->context().countClientHintsResourceWidth();
  44         m_shouldSendResourceWidth = true;
  45     }
  46
  47     if (acceptClientHintsHeader.contains("viewport-width")) {
  48         if (fetcher)
  49             fetcher->context().countClientHintsViewportWidth();
  50         m_shouldSendViewportWidth = true;
  51     }
  52 }
  53
  54 }