| /* |
| * Copyright (C) 2013 Google Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "third_party/blink/renderer/core/html/parser/html_resource_preloader.h" |
| |
| #include <memory> |
| |
| #include "base/feature_list.h" |
| #include "base/metrics/field_trial_params.h" |
| #include "third_party/blink/public/common/features.h" |
| #include "third_party/blink/public/platform/platform.h" |
| #include "third_party/blink/public/platform/web_prescient_networking.h" |
| #include "third_party/blink/renderer/core/dom/document.h" |
| #include "third_party/blink/renderer/core/frame/deprecation.h" |
| #include "third_party/blink/renderer/core/frame/settings.h" |
| #include "third_party/blink/renderer/core/frame/web_local_frame_impl.h" |
| #include "third_party/blink/renderer/core/loader/document_loader.h" |
| #include "third_party/blink/renderer/platform/loader/fetch/resource.h" |
| #include "third_party/blink/renderer/platform/loader/fetch/resource_fetcher.h" |
| |
| namespace blink { |
| |
| HTMLResourcePreloader::HTMLResourcePreloader(Document& document) |
| : document_(document) {} |
| |
| void HTMLResourcePreloader::Trace(Visitor* visitor) const { |
| visitor->Trace(document_); |
| } |
| |
| static void PreconnectHost(LocalFrame* local_frame, PreloadRequest* request) { |
| DCHECK(request); |
| DCHECK(request->IsPreconnect()); |
| KURL host(request->BaseURL(), request->ResourceURL()); |
| if (!host.IsValid() || !host.ProtocolIsInHTTPFamily()) |
| return; |
| WebPrescientNetworking* web_prescient_networking = |
| local_frame->PrescientNetworking(); |
| if (web_prescient_networking) { |
| web_prescient_networking->Preconnect( |
| host, request->CrossOrigin() != kCrossOriginAttributeAnonymous); |
| } |
| } |
| |
| void HTMLResourcePreloader::Preload(std::unique_ptr<PreloadRequest> preload) { |
| if (preload->IsPreconnect()) { |
| PreconnectHost(document_->GetFrame(), preload.get()); |
| return; |
| } |
| |
| if (!AllowPreloadRequest(preload.get())) { |
| return; |
| } |
| // TODO(yoichio): Should preload if document is imported. |
| if (!document_->Loader()) |
| return; |
| |
| preload->Start(document_); |
| } |
| |
| bool HTMLResourcePreloader::AllowPreloadRequest(PreloadRequest* preload) const { |
| if (!base::FeatureList::IsEnabled(features::kLightweightNoStatePrefetch)) |
| return true; |
| |
| if (!document_->IsPrefetchOnly()) |
| return true; |
| |
| // Don't fetch any other resources when in the HTML only arm of the |
| // experiment. |
| if (GetFieldTrialParamByFeatureAsBool(features::kLightweightNoStatePrefetch, |
| "html_only", false)) { |
| return false; |
| } |
| |
| switch (preload->Importance()) { |
| case mojom::FetchImportanceMode::kImportanceHigh: |
| return true; |
| case mojom::FetchImportanceMode::kImportanceLow: |
| case mojom::FetchImportanceMode::kImportanceAuto: |
| break; |
| } |
| |
| // When running lightweight prefetch, always skip image resources. Other |
| // resources are either classified into CSS (always fetched when not in the |
| // HTML only arm), JS (skip_script param), or other. |
| switch (preload->GetResourceType()) { |
| case ResourceType::kRaw: |
| case ResourceType::kSVGDocument: |
| case ResourceType::kXSLStyleSheet: |
| case ResourceType::kLinkPrefetch: |
| case ResourceType::kTextTrack: |
| case ResourceType::kImportResource: |
| case ResourceType::kAudio: |
| case ResourceType::kVideo: |
| case ResourceType::kManifest: |
| case ResourceType::kMock: |
| return !GetFieldTrialParamByFeatureAsBool( |
| features::kLightweightNoStatePrefetch, "skip_other", true); |
| case ResourceType::kImage: |
| return false; |
| case ResourceType::kCSSStyleSheet: |
| return true; |
| case ResourceType::kFont: |
| return false; |
| case ResourceType::kScript: |
| // We might skip all script. |
| if (GetFieldTrialParamByFeatureAsBool( |
| features::kLightweightNoStatePrefetch, "skip_script", false)) { |
| return false; |
| } |
| |
| // Otherwise, we might skip async/deferred script. |
| return !GetFieldTrialParamByFeatureAsBool( |
| features::kLightweightNoStatePrefetch, "skip_async_script", |
| true) || |
| preload->DeferOption() == FetchParameters::DeferOption::kNoDefer; |
| } |
| } |
| |
| } // namespace blink |