| /* |
| * 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, 2004, 2005, 2006, 2007, 2008 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 "core/dom/ScriptLoader.h" |
| |
| #include "bindings/core/v8/ScriptController.h" |
| #include "bindings/core/v8/ScriptSourceCode.h" |
| #include "core/HTMLNames.h" |
| #include "core/SVGNames.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/DocumentParserTiming.h" |
| #include "core/dom/IgnoreDestructiveWriteCountIncrementer.h" |
| #include "core/dom/ScriptLoaderClient.h" |
| #include "core/dom/ScriptRunner.h" |
| #include "core/dom/ScriptableDocumentParser.h" |
| #include "core/dom/Text.h" |
| #include "core/events/Event.h" |
| #include "core/frame/LocalFrame.h" |
| #include "core/frame/SubresourceIntegrity.h" |
| #include "core/frame/UseCounter.h" |
| #include "core/frame/csp/ContentSecurityPolicy.h" |
| #include "core/html/CrossOriginAttribute.h" |
| #include "core/html/HTMLScriptElement.h" |
| #include "core/html/imports/HTMLImport.h" |
| #include "core/html/parser/HTMLParserIdioms.h" |
| #include "core/inspector/ConsoleMessage.h" |
| #include "core/svg/SVGScriptElement.h" |
| #include "platform/WebFrameScheduler.h" |
| #include "platform/loader/fetch/AccessControlStatus.h" |
| #include "platform/loader/fetch/FetchRequest.h" |
| #include "platform/loader/fetch/MemoryCache.h" |
| #include "platform/loader/fetch/ResourceFetcher.h" |
| #include "platform/network/mime/MIMETypeRegistry.h" |
| #include "platform/weborigin/SecurityOrigin.h" |
| #include "public/platform/WebCachePolicy.h" |
| #include "wtf/StdLibExtras.h" |
| #include "wtf/text/StringBuilder.h" |
| #include "wtf/text/StringHash.h" |
| |
| namespace blink { |
| |
| ScriptLoader::ScriptLoader(Element* element, |
| bool parserInserted, |
| bool alreadyStarted, |
| bool createdDuringDocumentWrite) |
| : m_element(element), |
| m_startLineNumber(WTF::OrdinalNumber::beforeFirst()), |
| m_haveFiredLoad(false), |
| m_willBeParserExecuted(false), |
| m_willExecuteWhenDocumentFinishedParsing(false), |
| m_createdDuringDocumentWrite(createdDuringDocumentWrite), |
| m_asyncExecType(ScriptRunner::None), |
| m_documentWriteIntervention( |
| DocumentWriteIntervention::DocumentWriteInterventionNone) { |
| DCHECK(m_element); |
| |
| // https://html.spec.whatwg.org/#already-started |
| // "The cloning steps for script elements must set the "already started" |
| // flag on the copy if it is set on the element being cloned." |
| // TODO(hiroshige): Cloning is implemented together with |
| // {HTML,SVG}ScriptElement::cloneElementWithoutAttributesAndChildren(). |
| // Clean up these later. |
| if (alreadyStarted) |
| m_alreadyStarted = true; |
| |
| if (parserInserted) { |
| // https://html.spec.whatwg.org/#parser-inserted |
| // "It is set by the HTML parser and the XML parser |
| // on script elements they insert" |
| m_parserInserted = true; |
| |
| // https://html.spec.whatwg.org/#non-blocking |
| // "It is unset by the HTML parser and the XML parser |
| // on script elements they insert." |
| m_nonBlocking = false; |
| } |
| |
| if (parserInserted && element->document().scriptableDocumentParser() && |
| !element->document().isInDocumentWrite()) |
| m_startLineNumber = |
| element->document().scriptableDocumentParser()->lineNumber(); |
| } |
| |
| ScriptLoader::~ScriptLoader() {} |
| |
| DEFINE_TRACE(ScriptLoader) { |
| visitor->trace(m_element); |
| visitor->trace(m_resource); |
| visitor->trace(m_pendingScript); |
| PendingScriptClient::trace(visitor); |
| } |
| |
| void ScriptLoader::setFetchDocWrittenScriptDeferIdle() { |
| DCHECK(!m_createdDuringDocumentWrite); |
| m_documentWriteIntervention = |
| DocumentWriteIntervention::FetchDocWrittenScriptDeferIdle; |
| } |
| |
| void ScriptLoader::didNotifySubtreeInsertionsToDocument() { |
| if (!m_parserInserted) |
| prepareScript(); // FIXME: Provide a real starting line number here. |
| } |
| |
| void ScriptLoader::childrenChanged() { |
| if (!m_parserInserted && m_element->isConnected()) |
| prepareScript(); // FIXME: Provide a real starting line number here. |
| } |
| |
| void ScriptLoader::handleSourceAttribute(const String& sourceUrl) { |
| if (ignoresLoadRequest() || sourceUrl.isEmpty()) |
| return; |
| |
| prepareScript(); // FIXME: Provide a real starting line number here. |
| } |
| |
| void ScriptLoader::handleAsyncAttribute() { |
| // https://html.spec.whatwg.org/#non-blocking |
| // "In addition, whenever a script element whose "non-blocking" flag is set |
| // has an async content attribute added, the element's "non-blocking" flag |
| // must be unset." |
| m_nonBlocking = false; |
| } |
| |
| void ScriptLoader::detachPendingScript() { |
| if (!m_pendingScript) |
| return; |
| m_pendingScript->dispose(); |
| m_pendingScript = nullptr; |
| } |
| |
| static bool isLegacySupportedJavaScriptLanguage(const String& language) { |
| // Mozilla 1.8 accepts javascript1.0 - javascript1.7, but WinIE 7 accepts only |
| // javascript1.1 - javascript1.3. |
| // Mozilla 1.8 and WinIE 7 both accept javascript and livescript. |
| // WinIE 7 accepts ecmascript and jscript, but Mozilla 1.8 doesn't. |
| // Neither Mozilla 1.8 nor WinIE 7 accept leading or trailing whitespace. |
| // We want to accept all the values that either of these browsers accept, but |
| // not other values. |
| |
| // FIXME: This function is not HTML5 compliant. These belong in the MIME |
| // registry as "text/javascript<version>" entries. |
| return equalIgnoringASCIICase(language, "javascript") || |
| equalIgnoringASCIICase(language, "javascript1.0") || |
| equalIgnoringASCIICase(language, "javascript1.1") || |
| equalIgnoringASCIICase(language, "javascript1.2") || |
| equalIgnoringASCIICase(language, "javascript1.3") || |
| equalIgnoringASCIICase(language, "javascript1.4") || |
| equalIgnoringASCIICase(language, "javascript1.5") || |
| equalIgnoringASCIICase(language, "javascript1.6") || |
| equalIgnoringASCIICase(language, "javascript1.7") || |
| equalIgnoringASCIICase(language, "livescript") || |
| equalIgnoringASCIICase(language, "ecmascript") || |
| equalIgnoringASCIICase(language, "jscript"); |
| } |
| |
| void ScriptLoader::dispatchErrorEvent() { |
| m_element->dispatchEvent(Event::create(EventTypeNames::error)); |
| } |
| |
| void ScriptLoader::dispatchLoadEvent() { |
| if (ScriptLoaderClient* client = this->client()) |
| client->dispatchLoadEvent(); |
| setHaveFiredLoadEvent(true); |
| } |
| |
| bool ScriptLoader::isValidScriptTypeAndLanguage( |
| const String& type, |
| const String& language, |
| LegacyTypeSupport supportLegacyTypes) { |
| // 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. |
| if (type.isEmpty()) { |
| return language.isEmpty() || // assume text/javascript. |
| MIMETypeRegistry::isSupportedJavaScriptMIMEType("text/" + |
| language) || |
| isLegacySupportedJavaScriptLanguage(language); |
| } else if (RuntimeEnabledFeatures::moduleScriptsEnabled() && |
| type == "module") { |
| return true; |
| } else if (MIMETypeRegistry::isSupportedJavaScriptMIMEType( |
| type.stripWhiteSpace()) || |
| (supportLegacyTypes == AllowLegacyTypeInTypeAttribute && |
| isLegacySupportedJavaScriptLanguage(type))) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool ScriptLoader::isScriptTypeSupported( |
| LegacyTypeSupport supportLegacyTypes) const { |
| return isValidScriptTypeAndLanguage(client()->typeAttributeValue(), |
| client()->languageAttributeValue(), |
| supportLegacyTypes); |
| } |
| |
| // https://html.spec.whatwg.org/#prepare-a-script |
| bool ScriptLoader::prepareScript(const TextPosition& scriptStartPosition, |
| LegacyTypeSupport supportLegacyTypes) { |
| // 1. "If the script element is marked as having "already started", then |
| // abort these steps at this point. The script is not executed." |
| if (m_alreadyStarted) |
| return false; |
| |
| ScriptLoaderClient* client = this->client(); |
| |
| // 2. "If the element has its "parser-inserted" flag set, then |
| // set was-parser-inserted to true and unset the element's |
| // "parser-inserted" flag. |
| // Otherwise, set was-parser-inserted to false." |
| bool wasParserInserted; |
| if (m_parserInserted) { |
| wasParserInserted = true; |
| m_parserInserted = false; |
| } else { |
| wasParserInserted = false; |
| } |
| |
| // 3. "If was-parser-inserted is true and the element does not have an |
| // async attribute, then set the element's "non-blocking" flag to true." |
| if (wasParserInserted && !client->asyncAttributeValue()) |
| m_nonBlocking = true; |
| |
| // 4. "If the element has no src attribute, and its child nodes, if any, |
| // consist only of comment nodes and empty Text nodes, |
| // then abort these steps at this point. The script is not executed." |
| // FIXME: HTML5 spec says we should check that all children are either |
| // comments or empty text nodes. |
| if (!client->hasSourceAttribute() && !m_element->hasChildren()) |
| return false; |
| |
| // 5. "If the element is not connected, then abort these steps. |
| // The script is not executed." |
| if (!m_element->isConnected()) |
| return false; |
| |
| // 6. |
| // TODO(hiroshige): Annotate and/or cleanup this step. |
| if (!isScriptTypeSupported(supportLegacyTypes)) |
| return false; |
| |
| // 7. "If was-parser-inserted is true, |
| // then flag the element as "parser-inserted" again, |
| // and set the element's "non-blocking" flag to false." |
| if (wasParserInserted) { |
| m_parserInserted = true; |
| m_nonBlocking = false; |
| } |
| |
| // 8. "Set the element's "already started" flag." |
| m_alreadyStarted = true; |
| |
| // 9. "If the element is flagged as "parser-inserted", but the element's |
| // node document is not the Document of the parser that created the element, |
| // then abort these steps." |
| // FIXME: If script is parser inserted, verify it's still in the original |
| // document. |
| Document& elementDocument = m_element->document(); |
| Document* contextDocument = elementDocument.contextDocument(); |
| if (!contextDocument) |
| return false; |
| |
| // 10. "If scripting is disabled for the script element, then abort these |
| // steps at this point. The script is not executed." |
| if (!contextDocument->allowExecutingScripts(m_element)) |
| return false; |
| |
| // 13. |
| if (!isScriptForEventSupported()) |
| return false; |
| |
| // 14. "If the script element has a charset attribute, |
| // then let encoding be the result of |
| // getting an encoding from the value of the charset attribute." |
| // "If the script element does not have a charset attribute, |
| // or if getting an encoding failed, let encoding |
| // be the same as the encoding of the script element's node document." |
| // TODO(hiroshige): Should we handle failure in getting an encoding? |
| String encoding; |
| if (!client->charsetAttributeValue().isEmpty()) |
| encoding = client->charsetAttributeValue(); |
| else |
| encoding = elementDocument.characterSet(); |
| |
| // Steps 15--20 are handled in fetchScript(). |
| |
| // 21. "If the element has a src content attribute, run these substeps:" |
| if (client->hasSourceAttribute()) { |
| FetchRequest::DeferOption defer = FetchRequest::NoDefer; |
| if (!m_parserInserted || client->asyncAttributeValue() || |
| client->deferAttributeValue()) |
| defer = FetchRequest::LazyLoad; |
| if (m_documentWriteIntervention == |
| DocumentWriteIntervention::FetchDocWrittenScriptDeferIdle) |
| defer = FetchRequest::IdleLoad; |
| if (!fetchScript(client->sourceAttributeValue(), encoding, defer)) |
| return false; |
| } |
| |
| // 22. "If the element does not have a src content attribute, |
| // run these substeps:" |
| |
| // 22.1. "Let source text be the value of the text IDL attribute." |
| // This step is done later: |
| // - in ScriptLoader::pendingScript() (Step 23, 6th Clause), |
| // as Element::textFromChildren() in ScriptLoader::scriptContent(), |
| // - in HTMLParserScriptRunner::processScriptElementInternal() |
| // (Duplicated code of Step 23, 6th Clause), |
| // as Element::textContent(), |
| // - in XMLDocumentParser::endElementNs() (Step 23, 5th Clause), |
| // as Element::textFromChildren() in ScriptLoader::scriptContent(), |
| // - PendingScript::getSource() (Indirectly used via |
| // HTMLParserScriptRunner::processScriptElementInternal(), |
| // Step 23, 5th Clause), |
| // as Element::textContent(). |
| // TODO(hiroshige): Make them merged or consistent. |
| |
| // 22.2. "Switch on the script's type:" |
| // TODO(hiroshige): Clarify how Step 22.2 is implemented for "classic". |
| // TODO(hiroshige): Implement Step 22.2 for "module". |
| |
| // [Intervention] |
| // Since the asynchronous, low priority fetch for doc.written blocked |
| // script is not for execution, return early from here. Watch for its |
| // completion to be able to remove it from the memory cache. |
| if (m_documentWriteIntervention == |
| DocumentWriteIntervention::FetchDocWrittenScriptDeferIdle) { |
| m_pendingScript = PendingScript::create(m_element, m_resource.get()); |
| m_pendingScript->watchForLoad(this); |
| return true; |
| } |
| |
| // 23. "Then, follow the first of the following options that describes the |
| // situation:" |
| |
| // Three flags are used to instruct the caller of prepareScript() to execute |
| // a part of Step 23, when |m_willBeParserExecuted| is true: |
| // - |m_willBeParserExecuted| |
| // - |m_willExecuteWhenDocumentFinishedParsing| |
| // - |m_readyToBeParserExecuted| |
| // TODO(hiroshige): Clean up the dependency. |
| |
| // 1st Clause: |
| // - "If the script's type is "classic", and |
| // the element has a src attribute, and the element has a defer attribute, |
| // and the element has been flagged as "parser-inserted", |
| // and the element does not have an async attribute" |
| // TODO(hiroshige): Check the script's type and implement "module" case. |
| if (client->hasSourceAttribute() && client->deferAttributeValue() && |
| m_parserInserted && !client->asyncAttributeValue()) { |
| // This clause is implemented by the caller-side of prepareScript(): |
| // - HTMLParserScriptRunner::requestDeferredScript(), and |
| // - TODO(hiroshige): Investigate XMLDocumentParser::endElementNs() |
| m_willExecuteWhenDocumentFinishedParsing = true; |
| m_willBeParserExecuted = true; |
| |
| return true; |
| } |
| |
| // 2nd Clause: |
| // - "If the script's type is "classic", |
| // and the element has a src attribute, |
| // and the element has been flagged as "parser-inserted", |
| // and the element does not have an async attribute" |
| // TODO(hiroshige): Check the script's type. |
| if (client->hasSourceAttribute() && m_parserInserted && |
| !client->asyncAttributeValue()) { |
| // This clause is implemented by the caller-side of prepareScript(): |
| // - HTMLParserScriptRunner::requestParsingBlockingScript() |
| // - TODO(hiroshige): Investigate XMLDocumentParser::endElementNs() |
| m_willBeParserExecuted = true; |
| |
| return true; |
| } |
| |
| // 5th Clause: |
| // TODO(hiroshige): Reorder the clauses to match the spec. |
| // - "If the element does not have a src attribute, |
| // and the element has been flagged as "parser-inserted", |
| // and either the parser that created the script is an XML parser |
| // or it's an HTML parser whose script nesting level is not greater than |
| // one, |
| // and the Document of the HTML parser or XML parser that created |
| // the script element has a style sheet that is blocking scripts" |
| // The last part "... has a style sheet that is blocking scripts" |
| // is implemented in Document::isScriptExecutionReady(). |
| // Part of the condition check is done in |
| // HTMLParserScriptRunner::processScriptElementInternal(). |
| // TODO(hiroshige): Clean up the split condition check. |
| if (!client->hasSourceAttribute() && m_parserInserted && |
| !elementDocument.isScriptExecutionReady()) { |
| // The former part of this clause is |
| // implemented by the caller-side of prepareScript(): |
| // - HTMLParserScriptRunner::requestParsingBlockingScript() |
| // - TODO(hiroshige): Investigate XMLDocumentParser::endElementNs() |
| m_willBeParserExecuted = true; |
| // "Set the element's "ready to be parser-executed" flag." |
| m_readyToBeParserExecuted = true; |
| |
| return true; |
| } |
| |
| // 3rd Clause: |
| // - "If the script's type is "classic", |
| // and the element has a src attribute, |
| // and the element does not have an async attribute, |
| // and the element does not have the "non-blocking" flag set" |
| // TODO(hiroshige): Check the script's type and implement "module" case. |
| if (client->hasSourceAttribute() && !client->asyncAttributeValue() && |
| !m_nonBlocking) { |
| // "Add the element to the end of the list of scripts that will execute |
| // in order as soon as possible associated with the node document of the |
| // script element at the time the prepare a script algorithm started." |
| m_pendingScript = PendingScript::create(m_element, m_resource.get()); |
| m_asyncExecType = ScriptRunner::InOrder; |
| // TODO(hiroshige): Here |contextDocument| is used as "node document" |
| // while Step 14 uses |elementDocument| as "node document". Fix this. |
| contextDocument->scriptRunner()->queueScriptForExecution(this, |
| m_asyncExecType); |
| // Note that watchForLoad can immediately call pendingScriptFinished. |
| m_pendingScript->watchForLoad(this); |
| // The part "When the script is ready..." is implemented in |
| // ScriptRunner::notifyScriptReady(). |
| // TODO(hiroshige): Annotate it. |
| |
| return true; |
| } |
| |
| // 4th Clause: |
| // - "If the script's type is "classic", and the element has a src attribute" |
| // TODO(hiroshige): Check the script's type and implement "module" case. |
| if (client->hasSourceAttribute()) { |
| // "The element must be added to the set of scripts that will execute |
| // as soon as possible of the node document of the script element at the |
| // time the prepare a script algorithm started." |
| m_pendingScript = PendingScript::create(m_element, m_resource.get()); |
| m_asyncExecType = ScriptRunner::Async; |
| LocalFrame* frame = m_element->document().frame(); |
| if (frame) { |
| ScriptState* scriptState = ScriptState::forMainWorld(frame); |
| if (scriptState) |
| ScriptStreamer::startStreaming( |
| m_pendingScript.get(), ScriptStreamer::Async, frame->settings(), |
| scriptState, frame->frameScheduler()->loadingTaskRunner()); |
| } |
| // TODO(hiroshige): Here |contextDocument| is used as "node document" |
| // while Step 14 uses |elementDocument| as "node document". Fix this. |
| contextDocument->scriptRunner()->queueScriptForExecution(this, |
| m_asyncExecType); |
| // Note that watchForLoad can immediately call pendingScriptFinished. |
| m_pendingScript->watchForLoad(this); |
| // The part "When the script is ready..." is implemented in |
| // ScriptRunner::notifyScriptReady(). |
| // TODO(hiroshige): Annotate it. |
| |
| return true; |
| } |
| |
| // 6th Clause: |
| // - "Otherwise" |
| // "Immediately execute the script block, |
| // even if other scripts are already executing." |
| // Note: this block is also duplicated in |
| // HTMLParserScriptRunner::processScriptElementInternal(). |
| // TODO(hiroshige): Merge the duplicated code. |
| |
| // This clause is executed only if the script's type is "classic" |
| // and the element doesn't have a src attribute. |
| |
| // Reset line numbering for nested writes. |
| TextPosition position = elementDocument.isInDocumentWrite() |
| ? TextPosition() |
| : scriptStartPosition; |
| KURL scriptURL = (!elementDocument.isInDocumentWrite() && m_parserInserted) |
| ? elementDocument.url() |
| : KURL(); |
| |
| if (!executeScript(ScriptSourceCode(scriptContent(), scriptURL, position))) { |
| dispatchErrorEvent(); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| // Steps 15--21 of https://html.spec.whatwg.org/#prepare-a-script |
| bool ScriptLoader::fetchScript(const String& sourceUrl, |
| const String& encoding, |
| FetchRequest::DeferOption defer) { |
| DCHECK(m_element); |
| |
| Document* elementDocument = &(m_element->document()); |
| if (!m_element->isConnected() || m_element->document() != elementDocument) |
| return false; |
| |
| DCHECK(!m_resource); |
| // 21. "If the element has a src content attribute, run these substeps:" |
| if (!stripLeadingAndTrailingHTMLSpaces(sourceUrl).isEmpty()) { |
| // 21.4. "Parse src relative to the element's node document." |
| FetchRequest request( |
| ResourceRequest(elementDocument->completeURL(sourceUrl)), |
| m_element->localName()); |
| |
| // 15. "Let CORS setting be the current state of the element's |
| // crossorigin content attribute." |
| CrossOriginAttributeValue crossOrigin = crossOriginAttributeValue( |
| m_element->fastGetAttribute(HTMLNames::crossoriginAttr)); |
| |
| // 16. "Let module script credentials mode be determined by switching |
| // on CORS setting:" |
| // TODO(hiroshige): Implement this step for "module". |
| |
| // 21.6, "classic": "Fetch a classic script given ... CORS setting |
| // ... and encoding." |
| if (crossOrigin != CrossOriginAttributeNotSet) |
| request.setCrossOriginAccessControl(elementDocument->getSecurityOrigin(), |
| crossOrigin); |
| |
| request.setCharset(encoding); |
| |
| // 17. "If the script element has a nonce attribute, |
| // then let cryptographic nonce be that attribute's value. |
| // Otherwise, let cryptographic nonce be the empty string." |
| if (ContentSecurityPolicy::isNonceableElement(m_element.get())) |
| request.setContentSecurityPolicyNonce(client()->nonce()); |
| |
| // 19. "Let parser state be "parser-inserted" |
| // if the script element has been flagged as "parser-inserted", |
| // and "not parser-inserted" otherwise." |
| request.setParserDisposition(isParserInserted() ? ParserInserted |
| : NotParserInserted); |
| |
| request.setDefer(defer); |
| |
| // 18. "If the script element has an integrity attribute, |
| // then let integrity metadata be that attribute's value. |
| // Otherwise, let integrity metadata be the empty string." |
| String integrityAttr = |
| m_element->fastGetAttribute(HTMLNames::integrityAttr); |
| if (!integrityAttr.isEmpty()) { |
| IntegrityMetadataSet metadataSet; |
| SubresourceIntegrity::parseIntegrityAttribute(integrityAttr, metadataSet, |
| elementDocument); |
| request.setIntegrityMetadata(metadataSet); |
| } |
| |
| // [Intervention] |
| if (m_documentWriteIntervention == |
| DocumentWriteIntervention::FetchDocWrittenScriptDeferIdle) { |
| request.mutableResourceRequest().setHTTPHeaderField( |
| "Intervention", |
| "<https://www.chromestatus.com/feature/5718547946799104>"); |
| } |
| |
| // 21.6. "Switch on the script's type:" |
| |
| // - "classic": |
| // "Fetch a classic script given url, settings, cryptographic nonce, |
| // integrity metadata, parser state, CORS setting, and encoding." |
| m_resource = ScriptResource::fetch(request, elementDocument->fetcher()); |
| |
| // - "module": |
| // "Fetch a module script graph given url, settings, "script", |
| // cryptographic nonce, parser state, and |
| // module script credentials mode." |
| // TODO(kouhei, hiroshige): Implement this. |
| |
| // "When the chosen algorithm asynchronously completes, set |
| // the script's script to the result. At that time, the script is ready." |
| // When the script is ready, PendingScriptClient::pendingScriptFinished() |
| // is used as the notification, and the action to take when |
| // the script is ready is specified later, in |
| // - ScriptLoader::prepareScript(), or |
| // - HTMLParserScriptRunner, |
| // depending on the conditions in Step 23 of "prepare a script". |
| |
| // 21.3. "Set the element's from an external file flag." |
| m_isExternalScript = true; |
| } |
| |
| if (!m_resource) { |
| // 21.2. "If src is the empty string, queue a task to |
| // fire an event named error at the element, and abort these steps." |
| // 21.5. "If the previous step failed, queue a task to |
| // fire an event named error at the element, and abort these steps." |
| // TODO(hiroshige): Make this asynchronous. |
| dispatchErrorEvent(); |
| return false; |
| } |
| |
| // [Intervention] |
| if (m_createdDuringDocumentWrite && |
| m_resource->resourceRequest().getCachePolicy() == |
| WebCachePolicy::ReturnCacheDataDontLoad) { |
| m_documentWriteIntervention = |
| DocumentWriteIntervention::DoNotFetchDocWrittenScript; |
| } |
| |
| return true; |
| } |
| |
| bool isHTMLScriptLoader(Element* element) { |
| DCHECK(element); |
| return isHTMLScriptElement(*element); |
| } |
| |
| bool isSVGScriptLoader(Element* element) { |
| DCHECK(element); |
| return isSVGScriptElement(*element); |
| } |
| |
| void ScriptLoader::logScriptMIMEType(LocalFrame* frame, |
| ScriptResource* resource, |
| const String& mimeType) { |
| if (MIMETypeRegistry::isSupportedJavaScriptMIMEType(mimeType)) |
| return; |
| bool isText = mimeType.startsWith("text/", TextCaseASCIIInsensitive); |
| if (isText && isLegacySupportedJavaScriptLanguage(mimeType.substring(5))) |
| return; |
| bool isSameOrigin = |
| m_element->document().getSecurityOrigin()->canRequest(resource->url()); |
| bool isApplication = |
| !isText && mimeType.startsWith("application/", TextCaseASCIIInsensitive); |
| |
| UseCounter::Feature feature = |
| isSameOrigin |
| ? (isText ? UseCounter::SameOriginTextScript |
| : isApplication ? UseCounter::SameOriginApplicationScript |
| : UseCounter::SameOriginOtherScript) |
| : (isText ? UseCounter::CrossOriginTextScript |
| : isApplication ? UseCounter::CrossOriginApplicationScript |
| : UseCounter::CrossOriginOtherScript); |
| |
| UseCounter::count(frame, feature); |
| } |
| |
| bool ScriptLoader::executeScript(const ScriptSourceCode& sourceCode) { |
| double scriptExecStartTime = monotonicallyIncreasingTime(); |
| bool result = doExecuteScript(sourceCode); |
| |
| // NOTE: we do not check m_willBeParserExecuted here, since |
| // m_willBeParserExecuted is false for inline scripts, and we want to |
| // include inline script execution time as part of parser blocked script |
| // execution time. |
| if (m_asyncExecType == ScriptRunner::None) |
| DocumentParserTiming::from(m_element->document()) |
| .recordParserBlockedOnScriptExecutionDuration( |
| monotonicallyIncreasingTime() - scriptExecStartTime, |
| wasCreatedDuringDocumentWrite()); |
| return result; |
| } |
| |
| // https://html.spec.whatwg.org/#execute-the-script-block |
| // with additional support for HTML imports. |
| // Note that Steps 2 and 8 must be handled by the caller of doExecuteScript(), |
| // i.e. load/error events are dispatched by the caller. |
| // Steps 3--7 are implemented here in doExecuteScript(). |
| // TODO(hiroshige): Move event dispatching code to doExecuteScript(). |
| bool ScriptLoader::doExecuteScript(const ScriptSourceCode& sourceCode) { |
| DCHECK(m_alreadyStarted); |
| |
| if (sourceCode.isEmpty()) |
| return true; |
| |
| Document* elementDocument = &(m_element->document()); |
| Document* contextDocument = elementDocument->contextDocument(); |
| if (!contextDocument) |
| return true; |
| |
| LocalFrame* frame = contextDocument->frame(); |
| if (!frame) |
| return true; |
| |
| const ContentSecurityPolicy* csp = elementDocument->contentSecurityPolicy(); |
| bool shouldBypassMainWorldCSP = |
| (frame->script().shouldBypassMainWorldCSP()) || |
| csp->allowScriptWithHash(sourceCode.source(), |
| ContentSecurityPolicy::InlineType::Block); |
| |
| AtomicString nonce = |
| ContentSecurityPolicy::isNonceableElement(m_element.get()) |
| ? client()->nonce() |
| : nullAtom; |
| if (!m_isExternalScript && |
| (!shouldBypassMainWorldCSP && |
| !csp->allowInlineScript(m_element, elementDocument->url(), nonce, |
| m_startLineNumber, sourceCode.source()))) { |
| return false; |
| } |
| |
| if (m_isExternalScript) { |
| ScriptResource* resource = |
| m_resource ? m_resource.get() : sourceCode.resource(); |
| if (resource) { |
| if (!ScriptResource::mimeTypeAllowedByNosniff(resource->response())) { |
| contextDocument->addConsoleMessage(ConsoleMessage::create( |
| SecurityMessageSource, ErrorMessageLevel, |
| "Refused to execute script from '" + |
| resource->url().elidedString() + "' because its MIME type ('" + |
| resource->httpContentType() + "') is not executable, and " |
| "strict MIME type checking is " |
| "enabled.")); |
| return false; |
| } |
| |
| String mimeType = resource->httpContentType(); |
| if (mimeType.startsWith("image/") || mimeType == "text/csv" || |
| mimeType.startsWith("audio/") || mimeType.startsWith("video/")) { |
| contextDocument->addConsoleMessage(ConsoleMessage::create( |
| SecurityMessageSource, ErrorMessageLevel, |
| "Refused to execute script from '" + |
| resource->url().elidedString() + "' because its MIME type ('" + |
| mimeType + "') is not executable.")); |
| if (mimeType.startsWith("image/")) |
| UseCounter::count(frame, UseCounter::BlockedSniffingImageToScript); |
| else if (mimeType.startsWith("audio/")) |
| UseCounter::count(frame, UseCounter::BlockedSniffingAudioToScript); |
| else if (mimeType.startsWith("video/")) |
| UseCounter::count(frame, UseCounter::BlockedSniffingVideoToScript); |
| else if (mimeType == "text/csv") |
| UseCounter::count(frame, UseCounter::BlockedSniffingCSVToScript); |
| return false; |
| } |
| |
| logScriptMIMEType(frame, resource, mimeType); |
| } |
| } |
| |
| AccessControlStatus accessControlStatus = NotSharableCrossOrigin; |
| if (!m_isExternalScript) { |
| accessControlStatus = SharableCrossOrigin; |
| } else if (sourceCode.resource()) { |
| if (sourceCode.resource()->response().wasFetchedViaServiceWorker()) { |
| if (sourceCode.resource()->response().serviceWorkerResponseType() == |
| WebServiceWorkerResponseTypeOpaque) |
| accessControlStatus = OpaqueResource; |
| else |
| accessControlStatus = SharableCrossOrigin; |
| } else if (sourceCode.resource()->passesAccessControlCheck( |
| m_element->document().getSecurityOrigin())) { |
| accessControlStatus = SharableCrossOrigin; |
| } |
| } |
| |
| const bool isImportedScript = contextDocument != elementDocument; |
| |
| // 3. "If the script is from an external file, |
| // or the script's type is module", |
| // then increment the ignore-destructive-writes counter of the |
| // script element's node document. Let neutralized doc be that Document." |
| // TODO(hiroshige): Implement "module" case. |
| IgnoreDestructiveWriteCountIncrementer ignoreDestructiveWriteCountIncrementer( |
| m_isExternalScript || isImportedScript ? contextDocument : 0); |
| |
| // 4. "Let old script element be the value to which the script element's |
| // node document's currentScript object was most recently set." |
| // This is implemented as push/popCurrentScript(). |
| |
| // 5. "Switch on the script's type:" |
| // - "classic": |
| // 1. "If the script element's root is not a shadow root, |
| // then set the script element's node document's currentScript |
| // attribute to the script element. Otherwise, set it to null." |
| if (isHTMLScriptLoader(m_element) || isSVGScriptLoader(m_element)) |
| contextDocument->pushCurrentScript(m_element); |
| |
| // 2. "Run the classic script given by the script's script." |
| // Note: This is where the script is compiled and actually executed. |
| frame->script().executeScriptInMainWorld(sourceCode, accessControlStatus); |
| |
| // - "module": |
| // TODO(hiroshige): Implement this. |
| |
| // 6. "Set the script element's node document's currentScript attribute |
| // to old script element." |
| if (isHTMLScriptLoader(m_element) || isSVGScriptLoader(m_element)) { |
| DCHECK(contextDocument->currentScript() == m_element); |
| contextDocument->popCurrentScript(); |
| } |
| |
| return true; |
| |
| // 7. "Decrement the ignore-destructive-writes counter of neutralized doc, |
| // if it was incremented in the earlier step." |
| // Implemented as the scope out of IgnoreDestructiveWriteCountIncrementer. |
| } |
| |
| void ScriptLoader::execute() { |
| DCHECK(!m_willBeParserExecuted); |
| DCHECK(m_asyncExecType != ScriptRunner::None); |
| DCHECK(m_pendingScript->resource()); |
| bool errorOccurred = false; |
| ScriptSourceCode source = m_pendingScript->getSource(KURL(), errorOccurred); |
| detachPendingScript(); |
| if (errorOccurred) { |
| dispatchErrorEvent(); |
| } else if (!m_resource->wasCanceled()) { |
| if (executeScript(source)) |
| dispatchLoadEvent(); |
| else |
| dispatchErrorEvent(); |
| } |
| m_resource = nullptr; |
| } |
| |
| void ScriptLoader::pendingScriptFinished(PendingScript* pendingScript) { |
| DCHECK(!m_willBeParserExecuted); |
| DCHECK_EQ(m_pendingScript, pendingScript); |
| |
| // We do not need this script in the memory cache. The primary goals of |
| // sending this fetch request are to let the third party server know |
| // about the document.write scripts intervention and populate the http |
| // cache for subsequent uses. |
| if (m_documentWriteIntervention == |
| DocumentWriteIntervention::FetchDocWrittenScriptDeferIdle) { |
| memoryCache()->remove(m_pendingScript->resource()); |
| m_pendingScript->stopWatchingForLoad(); |
| return; |
| } |
| |
| DCHECK(m_asyncExecType != ScriptRunner::None); |
| |
| Document* contextDocument = m_element->document().contextDocument(); |
| if (!contextDocument) { |
| detachPendingScript(); |
| return; |
| } |
| |
| DCHECK_EQ(pendingScript->resource(), m_resource); |
| |
| if (m_resource->errorOccurred()) { |
| contextDocument->scriptRunner()->notifyScriptLoadError(this, |
| m_asyncExecType); |
| detachPendingScript(); |
| dispatchErrorEvent(); |
| return; |
| } |
| contextDocument->scriptRunner()->notifyScriptReady(this, m_asyncExecType); |
| m_pendingScript->stopWatchingForLoad(); |
| } |
| |
| bool ScriptLoader::ignoresLoadRequest() const { |
| return m_alreadyStarted || m_isExternalScript || m_parserInserted || |
| !element() || !element()->isConnected(); |
| } |
| |
| // Step 13 of https://html.spec.whatwg.org/#prepare-a-script |
| bool ScriptLoader::isScriptForEventSupported() const { |
| // 1. "Let for be the value of the for attribute." |
| String eventAttribute = client()->eventAttributeValue(); |
| // 2. "Let event be the value of the event attribute." |
| String forAttribute = client()->forAttributeValue(); |
| |
| // "If the script element has an event attribute and a for attribute, and |
| // the script's type is "classic", then run these substeps:" |
| // TODO(hiroshige): Check the script's type. |
| if (eventAttribute.isNull() || forAttribute.isNull()) |
| return true; |
| |
| // 3. "Strip leading and trailing ASCII whitespace from event and for." |
| forAttribute = forAttribute.stripWhiteSpace(); |
| // 4. "If for is not an ASCII case-insensitive match for the string |
| // "window", |
| // then abort these steps at this point. The script is not executed." |
| if (!equalIgnoringCase(forAttribute, "window")) |
| return false; |
| eventAttribute = eventAttribute.stripWhiteSpace(); |
| // 5. "If event is not an ASCII case-insensitive match for either the |
| // string "onload" or the string "onload()", |
| // then abort these steps at this point. The script is not executed. |
| return equalIgnoringCase(eventAttribute, "onload") || |
| equalIgnoringCase(eventAttribute, "onload()"); |
| } |
| |
| String ScriptLoader::scriptContent() const { |
| return m_element->textFromChildren(); |
| } |
| |
| ScriptLoaderClient* ScriptLoader::client() const { |
| if (isHTMLScriptLoader(m_element)) |
| return toHTMLScriptElement(m_element); |
| |
| if (isSVGScriptLoader(m_element)) |
| return toSVGScriptElement(m_element); |
| |
| NOTREACHED(); |
| return 0; |
| } |
| |
| ScriptLoader* toScriptLoaderIfPossible(Element* element) { |
| if (isHTMLScriptLoader(element)) |
| return toHTMLScriptElement(element)->loader(); |
| |
| if (isSVGScriptLoader(element)) |
| return toSVGScriptElement(element)->loader(); |
| |
| return 0; |
| } |
| |
| } // namespace blink |
