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// Copyright 2017 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/loader/modulescript/module_script_fetcher.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/renderer/core/dom/dom_implementation.h"
#include "third_party/blink/renderer/core/inspector/console_message.h"
#include "third_party/blink/renderer/core/loader/resource/script_resource.h"
#include "third_party/blink/renderer/core/loader/subresource_integrity_helper.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
#include "third_party/blink/renderer/platform/loader/cors/cors.h"
#include "third_party/blink/renderer/platform/network/mime/mime_type_registry.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
ModuleScriptFetcher::ModuleScriptFetcher(
base::PassKey<ModuleScriptLoader> pass_key) {}
void ModuleScriptFetcher::Client::OnFetched(
const ModuleScriptCreationParams& params) {
NotifyFetchFinishedSuccess(params);
}
void ModuleScriptFetcher::Client::OnFailed() {
NotifyFetchFinishedError(HeapVector<Member<ConsoleMessage>>());
}
void ModuleScriptFetcher::Trace(Visitor* visitor) const {
ResourceClient::Trace(visitor);
}
// <specdef href="https://html.spec.whatwg.org/C/#fetch-a-single-module-script">
bool ModuleScriptFetcher::WasModuleLoadSuccessful(
ScriptResource* resource,
ModuleType expected_module_type,
HeapVector<Member<ConsoleMessage>>* error_messages) {
DCHECK(error_messages);
DCHECK_EQ(resource->GetScriptType(), mojom::blink::ScriptType::kModule);
if (resource) {
SubresourceIntegrityHelper::GetConsoleMessages(
resource->IntegrityReportInfo(), error_messages);
}
// <spec step="9">... response's type is "error" ...</spec>
if (!resource || resource->ErrorOccurred() ||
resource->IntegrityDisposition() !=
ResourceIntegrityDisposition::kPassed) {
return false;
}
const auto& response = resource->GetResponse();
// <spec step="9">... response's status is not an ok status</spec>
if (response.IsHTTP() && !cors::IsOkStatus(response.HttpStatusCode())) {
return false;
}
// <spec step="10">Let type be the result of extracting a MIME type from
// response's header list.</spec>
//
// Note: For historical reasons, fetching a classic script does not include
// MIME type checking. In contrast, module scripts will fail to load if they
// are not of a correct MIME type.
// We use ResourceResponse::HttpContentType() instead of MimeType(), as
// MimeType() may be rewritten by mime sniffer.
//
// <spec step="12">If type is a JavaScript MIME type, then:</spec>
if (expected_module_type == ModuleType::kJavaScript &&
MIMETypeRegistry::IsSupportedJavaScriptMIMEType(
response.HttpContentType())) {
return true;
}
// <spec step="13">If type is a JSON MIME type, then:</spec>
if (base::FeatureList::IsEnabled(blink::features::kJSONModules) &&
expected_module_type == ModuleType::kJSON &&
MIMETypeRegistry::IsJSONMimeType(response.HttpContentType())) {
return true;
}
if (RuntimeEnabledFeatures::CSSModulesEnabled() &&
expected_module_type == ModuleType::kCSS &&
MIMETypeRegistry::IsSupportedStyleSheetMIMEType(
response.HttpContentType())) {
return true;
}
String message;
if (base::FeatureList::IsEnabled(blink::features::kJSONModules) ||
RuntimeEnabledFeatures::CSSModulesEnabled()) {
message =
"Failed to load module script: Expected a " +
ModuleScriptCreationParams::ModuleTypeToString(expected_module_type) +
" module script but the server responded with a MIME type of \"" +
resource->GetResponse().HttpContentType() +
"\". Strict MIME type checking is enforced for module scripts per HTML "
"spec.";
} else {
message =
"Failed to load module script: The server responded with a "
"non-JavaScript "
"MIME type of \"" +
resource->GetResponse().HttpContentType() +
"\". Strict MIME type checking is enforced for module scripts per HTML "
"spec.";
}
error_messages->push_back(MakeGarbageCollected<ConsoleMessage>(
mojom::ConsoleMessageSource::kJavaScript,
mojom::ConsoleMessageLevel::kError, message,
response.CurrentRequestUrl().GetString(), /*loader=*/nullptr,
resource->InspectorId()));
return false;
}
} // namespace blink
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