2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 1999 Antti Koivisto (koivisto@kde.org)
4 * (C) 2001 Dirk Mueller (mueller@kde.org)
5 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
6 * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB. If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
25 #include "core/dom/ScriptLoader.h"
27 #include "HTMLNames.h"
29 #include "bindings/v8/ScriptController.h"
30 #include "bindings/v8/ScriptSourceCode.h"
31 #include "core/dom/Document.h"
32 #include "core/events/Event.h"
33 #include "core/dom/IgnoreDestructiveWriteCountIncrementer.h"
34 #include "core/dom/ScriptLoaderClient.h"
35 #include "core/dom/ScriptRunner.h"
36 #include "core/dom/ScriptableDocumentParser.h"
37 #include "core/dom/Text.h"
38 #include "core/fetch/FetchRequest.h"
39 #include "core/fetch/ResourceFetcher.h"
40 #include "core/fetch/ScriptResource.h"
41 #include "core/html/HTMLImport.h"
42 #include "core/html/HTMLScriptElement.h"
43 #include "core/html/parser/HTMLParserIdioms.h"
44 #include "core/frame/ContentSecurityPolicy.h"
45 #include "core/frame/Frame.h"
46 #include "core/svg/SVGScriptElement.h"
47 #include "platform/MIMETypeRegistry.h"
48 #include "platform/weborigin/SecurityOrigin.h"
49 #include "wtf/StdLibExtras.h"
50 #include "wtf/text/StringBuilder.h"
51 #include "wtf/text/StringHash.h"
55 ScriptLoader::ScriptLoader(Element* element, bool parserInserted, bool alreadyStarted)
58 , m_startLineNumber(WTF::OrdinalNumber::beforeFirst())
59 , m_parserInserted(parserInserted)
60 , m_isExternalScript(false)
61 , m_alreadyStarted(alreadyStarted)
62 , m_haveFiredLoad(false)
63 , m_willBeParserExecuted(false)
64 , m_readyToBeParserExecuted(false)
65 , m_willExecuteWhenDocumentFinishedParsing(false)
66 , m_forceAsync(!parserInserted)
67 , m_willExecuteInOrder(false)
70 if (parserInserted && element->document().scriptableDocumentParser() && !element->document().isInDocumentWrite())
71 m_startLineNumber = element->document().scriptableDocumentParser()->lineNumber();
74 ScriptLoader::~ScriptLoader()
79 void ScriptLoader::didNotifySubtreeInsertionsToDocument()
81 if (!m_parserInserted)
82 prepareScript(); // FIXME: Provide a real starting line number here.
85 void ScriptLoader::childrenChanged()
87 if (!m_parserInserted && m_element->inDocument())
88 prepareScript(); // FIXME: Provide a real starting line number here.
91 void ScriptLoader::handleSourceAttribute(const String& sourceUrl)
93 if (ignoresLoadRequest() || sourceUrl.isEmpty())
96 prepareScript(); // FIXME: Provide a real starting line number here.
99 void ScriptLoader::handleAsyncAttribute()
101 m_forceAsync = false;
105 static bool isLegacySupportedJavaScriptLanguage(const String& language)
107 // Mozilla 1.8 accepts javascript1.0 - javascript1.7, but WinIE 7 accepts only javascript1.1 - javascript1.3.
108 // Mozilla 1.8 and WinIE 7 both accept javascript and livescript.
109 // WinIE 7 accepts ecmascript and jscript, but Mozilla 1.8 doesn't.
110 // Neither Mozilla 1.8 nor WinIE 7 accept leading or trailing whitespace.
111 // We want to accept all the values that either of these browsers accept, but not other values.
113 // FIXME: This function is not HTML5 compliant. These belong in the MIME registry as "text/javascript<version>" entries.
114 typedef HashSet<String, CaseFoldingHash> LanguageSet;
115 DEFINE_STATIC_LOCAL(LanguageSet, languages, ());
116 if (languages.isEmpty()) {
117 languages.add("javascript");
118 languages.add("javascript");
119 languages.add("javascript1.0");
120 languages.add("javascript1.1");
121 languages.add("javascript1.2");
122 languages.add("javascript1.3");
123 languages.add("javascript1.4");
124 languages.add("javascript1.5");
125 languages.add("javascript1.6");
126 languages.add("javascript1.7");
127 languages.add("livescript");
128 languages.add("ecmascript");
129 languages.add("jscript");
132 return languages.contains(language);
135 void ScriptLoader::dispatchErrorEvent()
137 m_element->dispatchEvent(Event::create(EventTypeNames::error));
140 void ScriptLoader::dispatchLoadEvent()
142 if (ScriptLoaderClient* client = this->client())
143 client->dispatchLoadEvent();
144 setHaveFiredLoadEvent(true);
147 bool ScriptLoader::isScriptTypeSupported(LegacyTypeSupport supportLegacyTypes) const
149 // FIXME: isLegacySupportedJavaScriptLanguage() is not valid HTML5. It is used here to maintain backwards compatibility with existing layout tests. The specific violations are:
150 // - Allowing type=javascript. type= should only support MIME types, such as text/javascript.
151 // - Allowing a different set of languages for language= and type=. language= supports Javascript 1.1 and 1.4-1.6, but type= does not.
153 String type = client()->typeAttributeValue();
154 String language = client()->languageAttributeValue();
155 if (type.isEmpty() && language.isEmpty())
156 return true; // Assume text/javascript.
157 if (type.isEmpty()) {
158 type = "text/" + language.lower();
159 if (MIMETypeRegistry::isSupportedJavaScriptMIMEType(type) || isLegacySupportedJavaScriptLanguage(language))
161 } else if (MIMETypeRegistry::isSupportedJavaScriptMIMEType(type.stripWhiteSpace()) || (supportLegacyTypes == AllowLegacyTypeInTypeAttribute && isLegacySupportedJavaScriptLanguage(type))) {
168 // http://dev.w3.org/html5/spec/Overview.html#prepare-a-script
169 bool ScriptLoader::prepareScript(const TextPosition& scriptStartPosition, LegacyTypeSupport supportLegacyTypes)
171 if (m_alreadyStarted)
174 ScriptLoaderClient* client = this->client();
176 bool wasParserInserted;
177 if (m_parserInserted) {
178 wasParserInserted = true;
179 m_parserInserted = false;
181 wasParserInserted = false;
184 if (wasParserInserted && !client->asyncAttributeValue())
187 // FIXME: HTML5 spec says we should check that all children are either comments or empty text nodes.
188 if (!client->hasSourceAttribute() && !m_element->firstChild())
191 if (!m_element->inDocument())
194 if (!isScriptTypeSupported(supportLegacyTypes))
197 if (wasParserInserted) {
198 m_parserInserted = true;
199 m_forceAsync = false;
202 m_alreadyStarted = true;
204 // FIXME: If script is parser inserted, verify it's still in the original document.
205 Document& elementDocument = m_element->document();
206 Document* contextDocument = elementDocument.contextDocument().get();
208 if (!contextDocument || !contextDocument->allowExecutingScripts(m_element))
211 if (!isScriptForEventSupported())
214 if (!client->charsetAttributeValue().isEmpty())
215 m_characterEncoding = client->charsetAttributeValue();
217 m_characterEncoding = elementDocument.charset();
219 if (client->hasSourceAttribute()) {
220 if (!fetchScript(client->sourceAttributeValue()))
224 if (client->hasSourceAttribute() && client->deferAttributeValue() && m_parserInserted && !client->asyncAttributeValue()) {
225 m_willExecuteWhenDocumentFinishedParsing = true;
226 m_willBeParserExecuted = true;
227 } else if (client->hasSourceAttribute() && m_parserInserted && !client->asyncAttributeValue()) {
228 m_willBeParserExecuted = true;
229 } else if (!client->hasSourceAttribute() && m_parserInserted && !elementDocument.haveStylesheetsAndImportsLoaded()) {
230 m_willBeParserExecuted = true;
231 m_readyToBeParserExecuted = true;
232 } else if (client->hasSourceAttribute() && !client->asyncAttributeValue() && !m_forceAsync) {
233 m_willExecuteInOrder = true;
234 contextDocument->scriptRunner()->queueScriptForExecution(this, m_resource, ScriptRunner::IN_ORDER_EXECUTION);
235 m_resource->addClient(this);
236 } else if (client->hasSourceAttribute()) {
237 contextDocument->scriptRunner()->queueScriptForExecution(this, m_resource, ScriptRunner::ASYNC_EXECUTION);
238 m_resource->addClient(this);
240 // Reset line numbering for nested writes.
241 TextPosition position = elementDocument.isInDocumentWrite() ? TextPosition() : scriptStartPosition;
242 KURL scriptURL = (!elementDocument.isInDocumentWrite() && m_parserInserted) ? elementDocument.url() : KURL();
243 executeScript(ScriptSourceCode(scriptContent(), scriptURL, position));
249 bool ScriptLoader::fetchScript(const String& sourceUrl)
253 RefPtr<Document> elementDocument(m_element->document());
254 if (!m_element->dispatchBeforeLoadEvent(sourceUrl))
256 if (!m_element->inDocument() || m_element->document() != elementDocument)
260 if (!stripLeadingAndTrailingHTMLSpaces(sourceUrl).isEmpty()) {
261 FetchRequest request(ResourceRequest(elementDocument->completeURL(sourceUrl)), m_element->localName());
263 AtomicString crossOriginMode = m_element->fastGetAttribute(HTMLNames::crossoriginAttr);
264 if (!crossOriginMode.isNull())
265 request.setCrossOriginAccessControl(elementDocument->securityOrigin(), crossOriginMode);
266 request.setCharset(scriptCharset());
268 bool isValidScriptNonce = elementDocument->contentSecurityPolicy()->allowScriptNonce(m_element->fastGetAttribute(HTMLNames::nonceAttr));
269 if (isValidScriptNonce)
270 request.setContentSecurityCheck(DoNotCheckContentSecurityPolicy);
272 m_resource = elementDocument->fetcher()->fetchScript(request);
273 m_isExternalScript = true;
279 dispatchErrorEvent();
283 bool isHTMLScriptLoader(Element* element)
285 return element->hasTagName(HTMLNames::scriptTag);
288 bool isSVGScriptLoader(Element* element)
290 return element->hasTagName(SVGNames::scriptTag);
293 void ScriptLoader::executeScript(const ScriptSourceCode& sourceCode)
295 ASSERT(m_alreadyStarted);
297 if (sourceCode.isEmpty())
300 RefPtr<Document> elementDocument(m_element->document());
301 RefPtr<Document> contextDocument = elementDocument->contextDocument().get();
302 if (!contextDocument)
305 Frame* frame = contextDocument->frame();
307 bool shouldBypassMainWorldContentSecurityPolicy = (frame && frame->script().shouldBypassMainWorldContentSecurityPolicy()) || elementDocument->contentSecurityPolicy()->allowScriptNonce(m_element->fastGetAttribute(HTMLNames::nonceAttr)) || elementDocument->contentSecurityPolicy()->allowScriptHash(sourceCode.source());
309 if (!m_isExternalScript && (!shouldBypassMainWorldContentSecurityPolicy && !elementDocument->contentSecurityPolicy()->allowInlineScript(elementDocument->url(), m_startLineNumber)))
312 if (m_isExternalScript && m_resource && !m_resource->mimeTypeAllowedByNosniff()) {
313 contextDocument->addConsoleMessage(SecurityMessageSource, ErrorMessageLevel, "Refused to execute script from '" + m_resource->url().elidedString() + "' because its MIME type ('" + m_resource->mimeType() + "') is not executable, and strict MIME type checking is enabled.");
318 IgnoreDestructiveWriteCountIncrementer ignoreDesctructiveWriteCountIncrementer(m_isExternalScript ? contextDocument.get() : 0);
320 if (isHTMLScriptLoader(m_element))
321 contextDocument->pushCurrentScript(toHTMLScriptElement(m_element));
323 AccessControlStatus corsCheck = NotSharableCrossOrigin;
324 if (sourceCode.resource() && sourceCode.resource()->passesAccessControlCheck(m_element->document().securityOrigin()))
325 corsCheck = SharableCrossOrigin;
327 // Create a script from the script element node, using the script
328 // block's source and the script block's type.
329 // Note: This is where the script is compiled and actually executed.
330 frame->script().executeScriptInMainWorld(sourceCode, corsCheck);
332 if (isHTMLScriptLoader(m_element)) {
333 ASSERT(contextDocument->currentScript() == m_element);
334 contextDocument->popCurrentScript();
339 void ScriptLoader::stopLoadRequest()
342 if (!m_willBeParserExecuted)
343 m_resource->removeClient(this);
348 void ScriptLoader::execute(ScriptResource* resource)
350 ASSERT(!m_willBeParserExecuted);
352 if (resource->errorOccurred()) {
353 dispatchErrorEvent();
354 } else if (!resource->wasCanceled()) {
355 executeScript(ScriptSourceCode(resource));
358 resource->removeClient(this);
361 void ScriptLoader::notifyFinished(Resource* resource)
363 ASSERT(!m_willBeParserExecuted);
365 RefPtr<Document> elementDocument(m_element->document());
366 RefPtr<Document> contextDocument = elementDocument->contextDocument().get();
367 if (!contextDocument)
370 // Resource possibly invokes this notifyFinished() more than
371 // once because ScriptLoader doesn't unsubscribe itself from
372 // Resource here and does it in execute() instead.
373 // We use m_resource to check if this function is already called.
374 ASSERT_UNUSED(resource, resource == m_resource);
377 if (m_resource->errorOccurred()) {
378 dispatchErrorEvent();
379 contextDocument->scriptRunner()->notifyScriptLoadError(this, m_willExecuteInOrder ? ScriptRunner::IN_ORDER_EXECUTION : ScriptRunner::ASYNC_EXECUTION);
382 if (m_willExecuteInOrder)
383 contextDocument->scriptRunner()->notifyScriptReady(this, ScriptRunner::IN_ORDER_EXECUTION);
385 contextDocument->scriptRunner()->notifyScriptReady(this, ScriptRunner::ASYNC_EXECUTION);
390 bool ScriptLoader::ignoresLoadRequest() const
392 return m_alreadyStarted || m_isExternalScript || m_parserInserted || !element() || !element()->inDocument();
395 bool ScriptLoader::isScriptForEventSupported() const
397 String eventAttribute = client()->eventAttributeValue();
398 String forAttribute = client()->forAttributeValue();
399 if (!eventAttribute.isEmpty() && !forAttribute.isEmpty()) {
400 forAttribute = forAttribute.stripWhiteSpace();
401 if (!equalIgnoringCase(forAttribute, "window"))
404 eventAttribute = eventAttribute.stripWhiteSpace();
405 if (!equalIgnoringCase(eventAttribute, "onload") && !equalIgnoringCase(eventAttribute, "onload()"))
411 String ScriptLoader::scriptContent() const
413 return m_element->textFromChildren();
416 ScriptLoaderClient* ScriptLoader::client() const
418 if (isHTMLScriptLoader(m_element))
419 return toHTMLScriptElement(m_element);
421 if (isSVGScriptLoader(m_element))
422 return toSVGScriptElement(m_element);
424 ASSERT_NOT_REACHED();
428 ScriptLoader* toScriptLoaderIfPossible(Element* element)
430 if (isHTMLScriptLoader(element))
431 return toHTMLScriptElement(element)->loader();
433 if (isSVGScriptLoader(element))
434 return toSVGScriptElement(element)->loader();