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// Copyright 2019 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/script/value_wrapper_synthetic_module_script.h"
#include "third_party/blink/public/platform/web_vector.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_binding_for_core.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_css_style_sheet_init.h"
#include "third_party/blink/renderer/core/css/css_style_sheet.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/loader/modulescript/module_script_creation_params.h"
#include "third_party/blink/renderer/core/script/modulator.h"
#include "third_party/blink/renderer/core/script/module_record_resolver.h"
#include "third_party/blink/renderer/platform/bindings/to_v8.h"
#include "third_party/blink/renderer/platform/weborigin/kurl.h"
#include "third_party/blink/renderer/platform/wtf/text/text_position.h"
#include "v8/include/v8.h"
namespace blink {
// https://whatpr.org/html/4898/webappapis.html#creating-a-css-module-script
ValueWrapperSyntheticModuleScript*
ValueWrapperSyntheticModuleScript::CreateCSSWrapperSyntheticModuleScript(
const base::Optional<ModuleScriptCreationParams>& params,
Modulator* settings_object) {
DCHECK(settings_object->HasValidContext());
ScriptState* script_state = settings_object->GetScriptState();
ScriptState::Scope scope(script_state);
v8::Isolate* isolate = script_state->GetIsolate();
ExceptionState exception_state(isolate, ExceptionState::kExecutionContext,
"ModuleScriptLoader",
"CreateCSSWrapperSyntheticModuleScript");
ExecutionContext* execution_context = ExecutionContext::From(script_state);
Document* context_document = Document::DynamicFrom(execution_context);
if (!context_document) {
v8::Local<v8::Value> error = V8ThrowException::CreateTypeError(
isolate, "Cannot create CSS Module in non-document context");
return ValueWrapperSyntheticModuleScript::CreateWithError(
v8::Local<v8::Value>(), settings_object, params->GetResponseUrl(),
KURL(), ScriptFetchOptions(), error);
}
CSSStyleSheetInit* init = CSSStyleSheetInit::Create();
CSSStyleSheet* style_sheet =
CSSStyleSheet::Create(*context_document, init, exception_state);
if (exception_state.HadException()) {
v8::Local<v8::Value> error = exception_state.GetException();
exception_state.ClearException();
return ValueWrapperSyntheticModuleScript::CreateWithError(
v8::Local<v8::Value>(), settings_object, params->GetResponseUrl(),
KURL(), ScriptFetchOptions(), error);
}
style_sheet->replaceSync(params->GetSourceText().ToString(), exception_state);
if (exception_state.HadException()) {
v8::Local<v8::Value> error = exception_state.GetException();
exception_state.ClearException();
return ValueWrapperSyntheticModuleScript::CreateWithError(
v8::Local<v8::Value>(), settings_object, params->GetResponseUrl(),
KURL(), ScriptFetchOptions(), error);
}
v8::Local<v8::Value> v8_value_stylesheet = ToV8(style_sheet, script_state);
return ValueWrapperSyntheticModuleScript::CreateWithDefaultExport(
v8_value_stylesheet, settings_object, params->GetResponseUrl(), KURL(),
ScriptFetchOptions());
}
ValueWrapperSyntheticModuleScript*
ValueWrapperSyntheticModuleScript::CreateJSONWrapperSyntheticModuleScript(
const base::Optional<ModuleScriptCreationParams>& params,
Modulator* settings_object) {
DCHECK(settings_object->HasValidContext());
ScriptState::Scope scope(settings_object->GetScriptState());
v8::Local<v8::Context> context =
settings_object->GetScriptState()->GetContext();
v8::Isolate* isolate = context->GetIsolate();
v8::TryCatch try_catch(isolate);
v8::Local<v8::String> original_json =
V8String(isolate, params->GetSourceText().ToString());
v8::Local<v8::Value> parsed_json;
ExceptionState exception_state(isolate, ExceptionState::kExecutionContext,
"ModuleScriptLoader",
"CreateJSONWrapperSyntheticModuleScript");
// Step 1. "Let script be a new module script that this algorithm will
// subsequently initialize."
// [spec text]
// Step 2. "Set script's settings object to settings."
// [spec text]
// Step 3. "Set script's base URL and fetch options to null."
// [spec text]
// Step 4. "Set script's parse error and error to rethrow to null."
// [spec text]
// Step 5. "Let json be ? Call(%JSONParse%, undefined, « source »).
// If this throws an exception, set script's parse error to that exception,
// and return script."
// [spec text]
if (!v8::JSON::Parse(context, original_json).ToLocal(&parsed_json)) {
DCHECK(try_catch.HasCaught());
exception_state.RethrowV8Exception(try_catch.Exception());
v8::Local<v8::Value> error = exception_state.GetException();
exception_state.ClearException();
return ValueWrapperSyntheticModuleScript::CreateWithError(
parsed_json, settings_object, params->GetResponseUrl(), KURL(),
ScriptFetchOptions(), error);
} else {
return ValueWrapperSyntheticModuleScript::CreateWithDefaultExport(
parsed_json, settings_object, params->GetResponseUrl(), KURL(),
ScriptFetchOptions());
}
}
ValueWrapperSyntheticModuleScript*
ValueWrapperSyntheticModuleScript::CreateWithDefaultExport(
v8::Local<v8::Value> value,
Modulator* settings_object,
const KURL& source_url,
const KURL& base_url,
const ScriptFetchOptions& fetch_options,
const TextPosition& start_position) {
v8::Isolate* isolate = settings_object->GetScriptState()->GetIsolate();
std::vector<v8::Local<v8::String>> export_names{V8String(isolate, "default")};
v8::Local<v8::Module> v8_synthetic_module = v8::Module::CreateSyntheticModule(
isolate, V8String(isolate, source_url.GetString()), export_names,
ValueWrapperSyntheticModuleScript::EvaluationSteps);
// Step 6. "Set script's record to the result of creating a synthetic module
// record with a default export of json with settings."
// [spec text]
ValueWrapperSyntheticModuleScript* value_wrapper_module_script =
MakeGarbageCollected<ValueWrapperSyntheticModuleScript>(
settings_object, v8_synthetic_module, source_url, base_url,
fetch_options, value, start_position);
settings_object->GetModuleRecordResolver()->RegisterModuleScript(
value_wrapper_module_script);
// Step 7. "Return script."
// [spec text]
return value_wrapper_module_script;
}
ValueWrapperSyntheticModuleScript*
ValueWrapperSyntheticModuleScript::CreateWithError(
v8::Local<v8::Value> value,
Modulator* settings_object,
const KURL& source_url,
const KURL& base_url,
const ScriptFetchOptions& fetch_options,
v8::Local<v8::Value> error,
const TextPosition& start_position) {
ValueWrapperSyntheticModuleScript* value_wrapper_module_script =
MakeGarbageCollected<ValueWrapperSyntheticModuleScript>(
settings_object, v8::Local<v8::Module>(), source_url, base_url,
fetch_options, value, start_position);
settings_object->GetModuleRecordResolver()->RegisterModuleScript(
value_wrapper_module_script);
value_wrapper_module_script->SetParseErrorAndClearRecord(
ScriptValue(settings_object->GetScriptState()->GetIsolate(), error));
// Step 7. "Return script."
// [spec text]
return value_wrapper_module_script;
}
ValueWrapperSyntheticModuleScript::ValueWrapperSyntheticModuleScript(
Modulator* settings_object,
v8::Local<v8::Module> record,
const KURL& source_url,
const KURL& base_url,
const ScriptFetchOptions& fetch_options,
v8::Local<v8::Value> value,
const TextPosition& start_position)
: ModuleScript(settings_object,
record,
source_url,
base_url,
fetch_options),
export_value_(v8::Isolate::GetCurrent(), value) {}
// This is the definition of [[EvaluationSteps]] As per the synthetic module
// spec https://heycam.github.io/webidl/#synthetic-module-records
// It is responsible for setting the default export of the provided module to
// the value wrapped by the ValueWrapperSyntheticModuleScript
v8::MaybeLocal<v8::Value> ValueWrapperSyntheticModuleScript::EvaluationSteps(
v8::Local<v8::Context> context,
v8::Local<v8::Module> module) {
v8::Isolate* isolate = context->GetIsolate();
ScriptState* script_state = ScriptState::From(context);
Modulator* modulator = Modulator::From(script_state);
ModuleRecordResolver* module_record_resolver =
modulator->GetModuleRecordResolver();
const ValueWrapperSyntheticModuleScript*
value_wrapper_synthetic_module_script =
static_cast<const ValueWrapperSyntheticModuleScript*>(
module_record_resolver->GetModuleScriptFromModuleRecord(module));
v8::TryCatch try_catch(isolate);
v8::Maybe<bool> result = module->SetSyntheticModuleExport(
isolate, V8String(isolate, "default"),
value_wrapper_synthetic_module_script->export_value_.NewLocal(isolate));
// Setting the default export should never fail.
DCHECK(!try_catch.HasCaught());
DCHECK(!result.IsNothing() && result.FromJust());
return v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
}
void ValueWrapperSyntheticModuleScript::Trace(Visitor* visitor) {
visitor->Trace(export_value_);
ModuleScript::Trace(visitor);
}
} // namespace blink
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