| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * (C) 2001 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2003-2017 Apple Inc. All rights reserved. |
| * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include "config.h" |
| #include "ScriptElement.h" |
| |
| #include "CachedResourceLoader.h" |
| #include "CachedResourceRequest.h" |
| #include "CachedScript.h" |
| #include "ContentSecurityPolicy.h" |
| #include "CrossOriginAccessControl.h" |
| #include "CurrentScriptIncrementer.h" |
| #include "Event.h" |
| #include "EventNames.h" |
| #include "Frame.h" |
| #include "FrameLoader.h" |
| #include "HTMLNames.h" |
| #include "HTMLParserIdioms.h" |
| #include "IgnoreDestructiveWriteCountIncrementer.h" |
| #include "InlineClassicScript.h" |
| #include "LoadableClassicScript.h" |
| #include "LoadableModuleScript.h" |
| #include "MIMETypeRegistry.h" |
| #include "PendingScript.h" |
| #include "RuntimeApplicationChecks.h" |
| #include "SVGScriptElement.h" |
| #include "ScriptController.h" |
| #include "ScriptDisallowedScope.h" |
| #include "ScriptRunner.h" |
| #include "ScriptSourceCode.h" |
| #include "ScriptableDocumentParser.h" |
| #include "Settings.h" |
| #include "TextNodeTraversal.h" |
| #include <wtf/StdLibExtras.h> |
| #include <wtf/text/StringBuilder.h> |
| #include <wtf/text/StringHash.h> |
| |
| namespace WebCore { |
| |
| static const auto maxUserGesturePropagationTime = 1_s; |
| |
| ScriptElement::ScriptElement(Element& element, bool parserInserted, bool alreadyStarted) |
| : m_element(element) |
| , m_startLineNumber(WTF::OrdinalNumber::beforeFirst()) |
| , m_parserInserted(parserInserted) |
| , m_isExternalScript(false) |
| , m_alreadyStarted(alreadyStarted) |
| , m_haveFiredLoad(false) |
| , m_willBeParserExecuted(false) |
| , m_readyToBeParserExecuted(false) |
| , m_willExecuteWhenDocumentFinishedParsing(false) |
| , m_forceAsync(!parserInserted) |
| , m_willExecuteInOrder(false) |
| , m_isModuleScript(false) |
| , m_creationTime(MonotonicTime::now()) |
| , m_userGestureToken(UserGestureIndicator::currentUserGesture()) |
| { |
| if (parserInserted && m_element.document().scriptableDocumentParser() && !m_element.document().isInDocumentWrite()) |
| m_startLineNumber = m_element.document().scriptableDocumentParser()->textPosition().m_line; |
| } |
| |
| void ScriptElement::didFinishInsertingNode() |
| { |
| ASSERT(!m_parserInserted); |
| prepareScript(); // FIXME: Provide a real starting line number here. |
| } |
| |
| void ScriptElement::childrenChanged(const ContainerNode::ChildChange& childChange) |
| { |
| if (!m_parserInserted && childChange.isInsertion() && m_element.isConnected()) |
| prepareScript(); // FIXME: Provide a real starting line number here. |
| } |
| |
| void ScriptElement::handleSourceAttribute(const String& sourceURL) |
| { |
| if (ignoresLoadRequest() || sourceURL.isEmpty()) |
| return; |
| |
| prepareScript(); // FIXME: Provide a real starting line number here. |
| } |
| |
| void ScriptElement::handleAsyncAttribute() |
| { |
| m_forceAsync = false; |
| } |
| |
| static bool isLegacySupportedJavaScriptLanguage(const String& language) |
| { |
| static const auto languages = makeNeverDestroyed(HashSet<String, ASCIICaseInsensitiveHash> { |
| "javascript", |
| "javascript1.0", |
| "javascript1.1", |
| "javascript1.2", |
| "javascript1.3", |
| "javascript1.4", |
| "javascript1.5", |
| "javascript1.6", |
| "javascript1.7", |
| "livescript", |
| "ecmascript", |
| "jscript", |
| }); |
| return languages.get().contains(language); |
| } |
| |
| void ScriptElement::dispatchErrorEvent() |
| { |
| m_element.dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No)); |
| } |
| |
| Optional<ScriptElement::ScriptType> ScriptElement::determineScriptType(LegacyTypeSupport supportLegacyTypes) const |
| { |
| // FIXME: isLegacySupportedJavaScriptLanguage() is not valid HTML5. It is used here to maintain backwards compatibility with existing layout tests. The specific violations are: |
| // - Allowing type=javascript. type= should only support MIME types, such as text/javascript. |
| // - Allowing a different set of languages for language= and type=. language= supports Javascript 1.1 and 1.4-1.6, but type= does not. |
| String type = typeAttributeValue(); |
| String language = languageAttributeValue(); |
| if (type.isEmpty()) { |
| if (language.isEmpty()) |
| return ScriptType::Classic; // Assume text/javascript. |
| if (MIMETypeRegistry::isSupportedJavaScriptMIMEType("text/" + language)) |
| return ScriptType::Classic; |
| if (isLegacySupportedJavaScriptLanguage(language)) |
| return ScriptType::Classic; |
| return WTF::nullopt; |
| } |
| if (MIMETypeRegistry::isSupportedJavaScriptMIMEType(type.stripWhiteSpace())) |
| return ScriptType::Classic; |
| if (supportLegacyTypes == AllowLegacyTypeInTypeAttribute && isLegacySupportedJavaScriptLanguage(type)) |
| return ScriptType::Classic; |
| |
| // FIXME: XHTML spec defines "defer" attribute. But WebKit does not implement it for a long time. |
| // And module tag also uses defer attribute semantics. We disable script type="module" for non HTML document. |
| // Once "defer" is implemented, we can reconsider enabling modules in XHTML. |
| // https://bugs.webkit.org/show_bug.cgi?id=123387 |
| if (!m_element.document().isHTMLDocument()) |
| return WTF::nullopt; |
| |
| // https://html.spec.whatwg.org/multipage/scripting.html#attr-script-type |
| // Setting the attribute to an ASCII case-insensitive match for the string "module" means that the script is a module script. |
| if (equalLettersIgnoringASCIICase(type, "module")) |
| return ScriptType::Module; |
| return WTF::nullopt; |
| } |
| |
| // http://dev.w3.org/html5/spec/Overview.html#prepare-a-script |
| bool ScriptElement::prepareScript(const TextPosition& scriptStartPosition, LegacyTypeSupport supportLegacyTypes) |
| { |
| if (m_alreadyStarted) |
| return false; |
| |
| bool wasParserInserted; |
| if (m_parserInserted) { |
| wasParserInserted = true; |
| m_parserInserted = false; |
| } else |
| wasParserInserted = false; |
| |
| if (wasParserInserted && !hasAsyncAttribute()) |
| m_forceAsync = true; |
| |
| // FIXME: HTML5 spec says we should check that all children are either comments or empty text nodes. |
| if (!hasSourceAttribute() && !m_element.firstChild()) |
| return false; |
| |
| if (!m_element.isConnected()) |
| return false; |
| |
| ScriptType scriptType = ScriptType::Classic; |
| if (Optional<ScriptType> result = determineScriptType(supportLegacyTypes)) |
| scriptType = result.value(); |
| else |
| return false; |
| m_isModuleScript = scriptType == ScriptType::Module; |
| |
| if (wasParserInserted) { |
| m_parserInserted = true; |
| m_forceAsync = false; |
| } |
| |
| m_alreadyStarted = true; |
| |
| // FIXME: If script is parser inserted, verify it's still in the original document. |
| Document& document = m_element.document(); |
| |
| // FIXME: Eventually we'd like to evaluate scripts which are inserted into a |
| // viewless document but this'll do for now. |
| // See http://bugs.webkit.org/show_bug.cgi?id=5727 |
| if (!document.frame()) |
| return false; |
| |
| if (scriptType == ScriptType::Classic && hasNoModuleAttribute()) |
| return false; |
| |
| if (!document.frame()->script().canExecuteScripts(AboutToExecuteScript)) |
| return false; |
| |
| if (scriptType == ScriptType::Classic && !isScriptForEventSupported()) |
| return false; |
| |
| // According to the spec, the module tag ignores the "charset" attribute as the same to the worker's |
| // importScript. But WebKit supports the "charset" for importScript intentionally. So to be consistent, |
| // even for the module tags, we handle the "charset" attribute. |
| if (!charsetAttributeValue().isEmpty()) |
| m_characterEncoding = charsetAttributeValue(); |
| else |
| m_characterEncoding = document.charset(); |
| |
| if (scriptType == ScriptType::Classic) { |
| if (hasSourceAttribute()) { |
| if (!requestClassicScript(sourceAttributeValue())) |
| return false; |
| } |
| } else { |
| ASSERT(scriptType == ScriptType::Module); |
| if (!requestModuleScript(scriptStartPosition)) |
| return false; |
| } |
| |
| // All the inlined module script is handled by requestModuleScript. It produces LoadableModuleScript and inlined module script |
| // is handled as the same to the external module script. |
| |
| bool isClassicExternalScript = scriptType == ScriptType::Classic && hasSourceAttribute(); |
| bool isParserInsertedDeferredScript = ((isClassicExternalScript && hasDeferAttribute()) || scriptType == ScriptType::Module) |
| && m_parserInserted && !hasAsyncAttribute(); |
| if (isParserInsertedDeferredScript) { |
| m_willExecuteWhenDocumentFinishedParsing = true; |
| m_willBeParserExecuted = true; |
| } else if (isClassicExternalScript && m_parserInserted && !hasAsyncAttribute()) { |
| ASSERT(scriptType == ScriptType::Classic); |
| m_willBeParserExecuted = true; |
| } else if ((isClassicExternalScript || scriptType == ScriptType::Module) && !hasAsyncAttribute() && !m_forceAsync) { |
| m_willExecuteInOrder = true; |
| ASSERT(m_loadableScript); |
| document.scriptRunner().queueScriptForExecution(*this, *m_loadableScript, ScriptRunner::IN_ORDER_EXECUTION); |
| } else if (hasSourceAttribute() || scriptType == ScriptType::Module) { |
| ASSERT(m_loadableScript); |
| ASSERT(hasAsyncAttribute() || m_forceAsync); |
| document.scriptRunner().queueScriptForExecution(*this, *m_loadableScript, ScriptRunner::ASYNC_EXECUTION); |
| } else if (!hasSourceAttribute() && m_parserInserted && !document.haveStylesheetsLoaded()) { |
| ASSERT(scriptType == ScriptType::Classic); |
| m_willBeParserExecuted = true; |
| m_readyToBeParserExecuted = true; |
| } else { |
| ASSERT(scriptType == ScriptType::Classic); |
| TextPosition position = document.isInDocumentWrite() ? TextPosition() : scriptStartPosition; |
| executeClassicScript(ScriptSourceCode(scriptContent(), URL(document.url()), position, JSC::SourceProviderSourceType::Program, InlineClassicScript::create(*this))); |
| } |
| |
| return true; |
| } |
| |
| bool ScriptElement::requestClassicScript(const String& sourceURL) |
| { |
| Ref<Document> originalDocument(m_element.document()); |
| if (!m_element.dispatchBeforeLoadEvent(sourceURL)) |
| return false; |
| bool didEventListenerDisconnectThisElement = !m_element.isConnected() || &m_element.document() != originalDocument.ptr(); |
| if (didEventListenerDisconnectThisElement) |
| return false; |
| |
| ASSERT(!m_loadableScript); |
| if (!stripLeadingAndTrailingHTMLSpaces(sourceURL).isEmpty()) { |
| auto script = LoadableClassicScript::create( |
| m_element.attributeWithoutSynchronization(HTMLNames::nonceAttr), |
| m_element.document().settings().subresourceIntegrityEnabled() ? m_element.attributeWithoutSynchronization(HTMLNames::integrityAttr).string() : emptyString(), |
| referrerPolicy(), |
| m_element.attributeWithoutSynchronization(HTMLNames::crossoriginAttr), |
| scriptCharset(), |
| m_element.localName(), |
| m_element.isInUserAgentShadowTree()); |
| if (script->load(m_element.document(), m_element.document().completeURL(sourceURL))) { |
| m_loadableScript = WTFMove(script); |
| m_isExternalScript = true; |
| } |
| } |
| |
| if (m_loadableScript) |
| return true; |
| |
| callOnMainThread([this, element = Ref<Element>(m_element)] { |
| dispatchErrorEvent(); |
| }); |
| return false; |
| } |
| |
| bool ScriptElement::requestModuleScript(const TextPosition& scriptStartPosition) |
| { |
| String nonce = m_element.attributeWithoutSynchronization(HTMLNames::nonceAttr); |
| String crossOriginMode = m_element.attributeWithoutSynchronization(HTMLNames::crossoriginAttr); |
| if (crossOriginMode.isNull()) |
| crossOriginMode = "omit"_s; |
| |
| if (hasSourceAttribute()) { |
| String sourceURL = sourceAttributeValue(); |
| Ref<Document> originalDocument(m_element.document()); |
| if (!m_element.dispatchBeforeLoadEvent(sourceURL)) |
| return false; |
| |
| bool didEventListenerDisconnectThisElement = !m_element.isConnected() || &m_element.document() != originalDocument.ptr(); |
| if (didEventListenerDisconnectThisElement) |
| return false; |
| |
| if (stripLeadingAndTrailingHTMLSpaces(sourceURL).isEmpty()) { |
| dispatchErrorEvent(); |
| return false; |
| } |
| |
| auto moduleScriptRootURL = m_element.document().completeURL(sourceURL); |
| if (!moduleScriptRootURL.isValid()) { |
| dispatchErrorEvent(); |
| return false; |
| } |
| |
| m_isExternalScript = true; |
| auto script = LoadableModuleScript::create( |
| nonce, |
| m_element.document().settings().subresourceIntegrityEnabled() ? m_element.attributeWithoutSynchronization(HTMLNames::integrityAttr).string() : emptyString(), |
| referrerPolicy(), |
| crossOriginMode, |
| scriptCharset(), |
| m_element.localName(), |
| m_element.isInUserAgentShadowTree()); |
| script->load(m_element.document(), moduleScriptRootURL); |
| m_loadableScript = WTFMove(script); |
| return true; |
| } |
| |
| auto script = LoadableModuleScript::create(nonce, emptyString(), referrerPolicy(), crossOriginMode, scriptCharset(), m_element.localName(), m_element.isInUserAgentShadowTree()); |
| |
| TextPosition position = m_element.document().isInDocumentWrite() ? TextPosition() : scriptStartPosition; |
| ScriptSourceCode sourceCode(scriptContent(), URL(m_element.document().url()), position, JSC::SourceProviderSourceType::Module, script.copyRef()); |
| |
| ASSERT(m_element.document().contentSecurityPolicy()); |
| const auto& contentSecurityPolicy = *m_element.document().contentSecurityPolicy(); |
| bool hasKnownNonce = contentSecurityPolicy.allowScriptWithNonce(nonce, m_element.isInUserAgentShadowTree()); |
| if (!contentSecurityPolicy.allowInlineScript(m_element.document().url(), m_startLineNumber, sourceCode.source().toStringWithoutCopying(), hasKnownNonce)) |
| return false; |
| |
| script->load(m_element.document(), sourceCode); |
| m_loadableScript = WTFMove(script); |
| return true; |
| } |
| |
| void ScriptElement::executeClassicScript(const ScriptSourceCode& sourceCode) |
| { |
| RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(ScriptDisallowedScope::InMainThread::isScriptAllowed() || !isInWebProcess()); |
| ASSERT(m_alreadyStarted); |
| |
| if (sourceCode.isEmpty()) |
| return; |
| |
| if (!m_isExternalScript) { |
| ASSERT(m_element.document().contentSecurityPolicy()); |
| const ContentSecurityPolicy& contentSecurityPolicy = *m_element.document().contentSecurityPolicy(); |
| bool hasKnownNonce = contentSecurityPolicy.allowScriptWithNonce(m_element.attributeWithoutSynchronization(HTMLNames::nonceAttr), m_element.isInUserAgentShadowTree()); |
| if (!contentSecurityPolicy.allowInlineScript(m_element.document().url(), m_startLineNumber, sourceCode.source().toStringWithoutCopying(), hasKnownNonce)) |
| return; |
| } |
| |
| auto& document = m_element.document(); |
| auto* frame = document.frame(); |
| if (!frame) |
| return; |
| |
| IgnoreDestructiveWriteCountIncrementer ignoreDesctructiveWriteCountIncrementer(m_isExternalScript ? &document : nullptr); |
| CurrentScriptIncrementer currentScriptIncrementer(document, m_element); |
| |
| frame->script().evaluate(sourceCode); |
| } |
| |
| void ScriptElement::executeModuleScript(LoadableModuleScript& loadableModuleScript) |
| { |
| // https://html.spec.whatwg.org/multipage/scripting.html#execute-the-script-block |
| |
| ASSERT(!loadableModuleScript.error()); |
| |
| auto& document = m_element.document(); |
| auto* frame = document.frame(); |
| if (!frame) |
| return; |
| |
| IgnoreDestructiveWriteCountIncrementer ignoreDesctructiveWriteCountIncrementer(&document); |
| CurrentScriptIncrementer currentScriptIncrementer(document, m_element); |
| |
| frame->script().linkAndEvaluateModuleScript(loadableModuleScript); |
| } |
| |
| void ScriptElement::dispatchLoadEventRespectingUserGestureIndicator() |
| { |
| if (MonotonicTime::now() - m_creationTime > maxUserGesturePropagationTime) { |
| dispatchLoadEvent(); |
| return; |
| } |
| |
| UserGestureIndicator indicator(m_userGestureToken); |
| dispatchLoadEvent(); |
| } |
| |
| void ScriptElement::executeScriptAndDispatchEvent(LoadableScript& loadableScript) |
| { |
| if (Optional<LoadableScript::Error> error = loadableScript.error()) { |
| if (Optional<LoadableScript::ConsoleMessage> message = error->consoleMessage) |
| m_element.document().addConsoleMessage(message->source, message->level, message->message); |
| dispatchErrorEvent(); |
| } else if (!loadableScript.wasCanceled()) { |
| ASSERT(!loadableScript.error()); |
| loadableScript.execute(*this); |
| dispatchLoadEventRespectingUserGestureIndicator(); |
| } |
| } |
| |
| void ScriptElement::executePendingScript(PendingScript& pendingScript) |
| { |
| if (auto* loadableScript = pendingScript.loadableScript()) |
| executeScriptAndDispatchEvent(*loadableScript); |
| else { |
| ASSERT(!pendingScript.error()); |
| ASSERT_WITH_MESSAGE(scriptType() == ScriptType::Classic, "Module script always have a loadableScript pointer."); |
| executeClassicScript(ScriptSourceCode(scriptContent(), URL(m_element.document().url()), pendingScript.startingPosition(), JSC::SourceProviderSourceType::Program, InlineClassicScript::create(*this))); |
| dispatchLoadEventRespectingUserGestureIndicator(); |
| } |
| } |
| |
| bool ScriptElement::ignoresLoadRequest() const |
| { |
| return m_alreadyStarted || m_isExternalScript || m_parserInserted || !m_element.isConnected(); |
| } |
| |
| bool ScriptElement::isScriptForEventSupported() const |
| { |
| String eventAttribute = eventAttributeValue(); |
| String forAttribute = forAttributeValue(); |
| if (!eventAttribute.isNull() && !forAttribute.isNull()) { |
| forAttribute = stripLeadingAndTrailingHTMLSpaces(forAttribute); |
| if (!equalLettersIgnoringASCIICase(forAttribute, "window")) |
| return false; |
| |
| eventAttribute = stripLeadingAndTrailingHTMLSpaces(eventAttribute); |
| if (!equalLettersIgnoringASCIICase(eventAttribute, "onload") && !equalLettersIgnoringASCIICase(eventAttribute, "onload()")) |
| return false; |
| } |
| return true; |
| } |
| |
| String ScriptElement::scriptContent() const |
| { |
| return TextNodeTraversal::childTextContent(m_element); |
| } |
| |
| void ScriptElement::ref() |
| { |
| m_element.ref(); |
| } |
| |
| void ScriptElement::deref() |
| { |
| m_element.deref(); |
| } |
| |
| bool isScriptElement(Element& element) |
| { |
| return is<HTMLScriptElement>(element) || is<SVGScriptElement>(element); |
| } |
| |
| ScriptElement& downcastScriptElement(Element& element) |
| { |
| if (is<HTMLScriptElement>(element)) |
| return downcast<HTMLScriptElement>(element); |
| return downcast<SVGScriptElement>(element); |
| } |
| |
| } |
