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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "ScriptElement.h"
#include "ScriptLoader.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/CycleCollectedJSContext.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/MutationEventBinding.h"
#include "nsContentUtils.h"
#include "nsThreadUtils.h"
#include "nsPresContext.h"
#include "nsIParser.h"
#include "nsGkAtoms.h"
#include "nsContentSink.h"
using namespace mozilla;
using namespace mozilla::dom;
NS_IMETHODIMP
ScriptElement::ScriptAvailable(nsresult aResult, nsIScriptElement* aElement,
bool aIsInlineClassicScript, nsIURI* aURI,
uint32_t aLineNo) {
if (!aIsInlineClassicScript && NS_FAILED(aResult)) {
nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
if (parser) {
nsCOMPtr<nsIContentSink> sink = parser->GetContentSink();
if (sink) {
nsCOMPtr<Document> parserDoc = do_QueryInterface(sink->GetTarget());
if (GetAsContent()->OwnerDoc() != parserDoc) {
// Suppress errors when we've moved between docs.
// /html/semantics/scripting-1/the-script-element/moving-between-documents/move-back-iframe-fetch-error-external-module.html
return NS_OK;
}
}
}
if (parser) {
parser->IncrementScriptNestingLevel();
}
nsresult rv = FireErrorEvent();
if (parser) {
parser->DecrementScriptNestingLevel();
}
return rv;
}
return NS_OK;
}
/* virtual */
nsresult ScriptElement::FireErrorEvent() {
nsIContent* cont = GetAsContent();
return nsContentUtils::DispatchTrustedEvent(
cont->OwnerDoc(), cont, u"error"_ns, CanBubble::eNo, Cancelable::eNo);
}
NS_IMETHODIMP
ScriptElement::ScriptEvaluated(nsresult aResult, nsIScriptElement* aElement,
bool aIsInline) {
nsresult rv = NS_OK;
if (!aIsInline) {
nsCOMPtr<nsIContent> cont = GetAsContent();
RefPtr<nsPresContext> presContext =
nsContentUtils::GetContextForContent(cont);
nsEventStatus status = nsEventStatus_eIgnore;
EventMessage message = NS_SUCCEEDED(aResult) ? eLoad : eLoadError;
WidgetEvent event(true, message);
// Load event doesn't bubble.
event.mFlags.mBubbles = (message != eLoad);
EventDispatcher::Dispatch(cont, presContext, &event, nullptr, &status);
}
return rv;
}
void ScriptElement::CharacterDataChanged(nsIContent* aContent,
const CharacterDataChangeInfo&) {
MaybeProcessScript();
}
void ScriptElement::AttributeChanged(Element* aElement, int32_t aNameSpaceID,
nsAtom* aAttribute, int32_t aModType,
const nsAttrValue* aOldValue) {
// When a script element el that is not parser-inserted experiences one of the
// events listed in the following list, the user agent must immediately
// prepare the script element el:
// - The script element is connected and has a src attribute set where
// previously the element had no such attribute.
if (aElement->IsSVGElement() && ((aNameSpaceID != kNameSpaceID_XLink &&
aNameSpaceID != kNameSpaceID_None) ||
aAttribute != nsGkAtoms::href)) {
return;
}
if (aElement->IsHTMLElement() &&
(aNameSpaceID != kNameSpaceID_None || aAttribute != nsGkAtoms::src)) {
return;
}
if (mParserCreated == NOT_FROM_PARSER &&
aModType == MutationEvent_Binding::ADDITION) {
auto* cont = GetAsContent();
if (cont->IsInComposedDoc()) {
MaybeProcessScript();
}
}
}
void ScriptElement::ContentAppended(nsIContent* aFirstNewContent) {
MaybeProcessScript();
}
void ScriptElement::ContentInserted(nsIContent* aChild) {
MaybeProcessScript();
}
bool ScriptElement::MaybeProcessScript() {
nsIContent* cont = GetAsContent();
NS_ASSERTION(cont->DebugGetSlots()->mMutationObservers.contains(this),
"You forgot to add self as observer");
// An end tag whose tag name is "script"
// - If the active speculative HTML parser is null and the JavaScript
// execution context stack is empty, then perform a microtask checkpoint.
nsContentUtils::AddScriptRunner(NS_NewRunnableFunction(
"ScriptElement::MaybeProcessScript", []() { nsAutoMicroTask mt; }));
if (mAlreadyStarted || !mDoneAddingChildren || !cont->GetComposedDoc() ||
mMalformed) {
return false;
}
if (!HasScriptContent()) {
// In the case of an empty, non-external classic script, there is nothing
// to process. However, we must perform a microtask checkpoint afterwards,
if (mKind == JS::loader::ScriptKind::eClassic && !mExternal) {
nsContentUtils::AddScriptRunner(NS_NewRunnableFunction(
"ScriptElement::MaybeProcessScript", []() { nsAutoMicroTask mt; }));
}
return false;
}
// Check the type attribute to determine language and version. If type exists,
// it trumps the deprecated 'language='.
nsAutoString type;
bool hasType = GetScriptType(type);
if (!type.IsEmpty()) {
if (!nsContentUtils::IsJavascriptMIMEType(type) &&
!type.LowerCaseEqualsASCII("module") &&
!type.LowerCaseEqualsASCII("importmap")) {
#ifdef DEBUG
// There is a WebGL convention to store strings they need inside script
// tags with these specific unknown script types, so don't warn for them.
// "text/something-not-javascript" only seems to be used in the WebGL
// conformance tests, but it is also clearly deliberately invalid, so
// skip warning for it, too, to reduce warning spam.
if (!type.LowerCaseEqualsASCII("x-shader/x-vertex") &&
!type.LowerCaseEqualsASCII("x-shader/x-fragment") &&
!type.LowerCaseEqualsASCII("text/something-not-javascript")) {
NS_WARNING(nsPrintfCString("Unknown script type '%s'",
NS_ConvertUTF16toUTF8(type).get())
.get());
}
#endif // #ifdef DEBUG
return false;
}
} else if (!hasType) {
// "language" is a deprecated attribute of HTML, so we check it only for
// HTML script elements.
if (cont->IsHTMLElement()) {
nsAutoString language;
cont->AsElement()->GetAttr(nsGkAtoms::language, language);
if (!language.IsEmpty() &&
!nsContentUtils::IsJavaScriptLanguage(language)) {
return false;
}
}
}
Document* ownerDoc = cont->OwnerDoc();
FreezeExecutionAttrs(ownerDoc);
mAlreadyStarted = true;
nsCOMPtr<nsIParser> parser = ((nsIScriptElement*)this)->GetCreatorParser();
if (parser) {
nsCOMPtr<nsIContentSink> sink = parser->GetContentSink();
if (sink) {
nsCOMPtr<Document> parserDoc = do_QueryInterface(sink->GetTarget());
if (ownerDoc != parserDoc) {
return false;
}
}
}
RefPtr<ScriptLoader> loader = ownerDoc->ScriptLoader();
return loader->ProcessScriptElement(this);
}
bool ScriptElement::GetScriptType(nsAString& aType) {
Element* element = GetAsContent()->AsElement();
nsAutoString type;
if (!element->GetAttr(nsGkAtoms::type, type)) {
return false;
}
// U+0009 TAB, U+000A LF, U+000C FF, U+000D CR, or U+0020 SPACE.
static const char kASCIIWhitespace[] = "\t\n\f\r ";
const bool wasEmptyBeforeTrim = type.IsEmpty();
type.Trim(kASCIIWhitespace);
// If the value before trim was not empty and the value is now empty, do not
// trim as we want to retain pure whitespace (by restoring original value)
// because we need to treat "" and " " (etc) differently.
if (!wasEmptyBeforeTrim && type.IsEmpty()) {
return element->GetAttr(nsGkAtoms::type, aType);
}
aType.Assign(type);
return true;
}