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// 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 "third_party/blink/renderer/core/html/parser/preload_request.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/frame/settings.h"
#include "third_party/blink/renderer/core/loader/document_loader.h"
#include "third_party/blink/renderer/core/loader/preload_helper.h"
#include "third_party/blink/renderer/core/script/document_write_intervention.h"
#include "third_party/blink/renderer/core/script/script_loader.h"
#include "third_party/blink/renderer/platform/cross_origin_attribute_value.h"
#include "third_party/blink/renderer/platform/loader/fetch/fetch_initiator_info.h"
#include "third_party/blink/renderer/platform/loader/fetch/fetch_parameters.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_fetcher.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_loader_options.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/weborigin/security_policy.h"
namespace blink {
KURL PreloadRequest::CompleteURL(Document* document) {
if (!base_url_.IsEmpty())
return document->CompleteURLWithOverride(resource_url_, base_url_);
return document->CompleteURL(resource_url_);
}
Resource* PreloadRequest::Start(Document* document) {
DCHECK(IsMainThread());
FetchInitiatorInfo initiator_info;
initiator_info.name = AtomicString(initiator_name_);
initiator_info.position = initiator_position_;
const KURL& url = CompleteURL(document);
// Data URLs are filtered out in the preload scanner.
DCHECK(!url.ProtocolIsData());
ResourceRequest resource_request(url);
resource_request.SetReferrerPolicy(referrer_policy_);
if (referrer_source_ == kBaseUrlIsReferrer)
resource_request.SetReferrerString(base_url_.StrippedForUseAsReferrer());
resource_request.SetRequestContext(ResourceFetcher::DetermineRequestContext(
resource_type_, is_image_set_, false));
resource_request.SetFetchImportanceMode(importance_);
ResourceLoaderOptions options;
options.initiator_info = initiator_info;
FetchParameters params(resource_request, options);
if (resource_type_ == ResourceType::kImportResource) {
const SecurityOrigin* security_origin =
document->ContextDocument()->GetSecurityOrigin();
params.SetCrossOriginAccessControl(security_origin,
kCrossOriginAttributeAnonymous);
}
if (script_type_ == mojom::ScriptType::kModule) {
DCHECK_EQ(resource_type_, ResourceType::kScript);
params.SetCrossOriginAccessControl(
document->GetSecurityOrigin(),
ScriptLoader::ModuleScriptCredentialsMode(cross_origin_));
} else if (cross_origin_ != kCrossOriginAttributeNotSet) {
params.SetCrossOriginAccessControl(document->GetSecurityOrigin(),
cross_origin_);
}
params.SetDefer(defer_);
params.SetResourceWidth(resource_width_);
params.GetClientHintsPreferences().UpdateFrom(client_hints_preferences_);
params.SetIntegrityMetadata(integrity_metadata_);
params.SetContentSecurityPolicyNonce(nonce_);
params.SetParserDisposition(kParserInserted);
if (request_type_ == kRequestTypeLinkRelPreload)
params.SetLinkPreload(true);
if (script_type_ == mojom::ScriptType::kModule) {
DCHECK_EQ(resource_type_, ResourceType::kScript);
params.SetDecoderOptions(
TextResourceDecoderOptions::CreateAlwaysUseUTF8ForText());
} else if (resource_type_ == ResourceType::kScript ||
resource_type_ == ResourceType::kCSSStyleSheet ||
resource_type_ == ResourceType::kImportResource) {
params.SetCharset(charset_.IsEmpty() ? document->Encoding()
: WTF::TextEncoding(charset_));
}
FetchParameters::SpeculativePreloadType speculative_preload_type =
FetchParameters::SpeculativePreloadType::kInDocument;
if (from_insertion_scanner_) {
speculative_preload_type =
FetchParameters::SpeculativePreloadType::kInserted;
}
params.SetSpeculativePreloadType(speculative_preload_type);
if (resource_type_ == ResourceType::kScript) {
MaybeDisallowFetchForDocWrittenScript(params, *document);
// We intentionally ignore the returned value, because we don't resend
// the async request to the blocked script here.
}
if (resource_type_ == ResourceType::kImage) {
if (const auto* frame = document->Loader()->GetFrame()) {
if (frame->IsClientLoFiAllowed(params.GetResourceRequest())) {
params.SetClientLoFiPlaceholder();
} else if (!is_lazyload_image_disabled_ &&
frame->IsLazyLoadingImageAllowed()) {
params.SetLazyImagePlaceholder();
}
}
}
return PreloadHelper::StartPreload(resource_type_, params,
document->Fetcher());
}
} // namespace blink
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