void ScriptLoader::executeScript(const ScriptSourceCode& sourceCode, double* compilationFinishTime)
{
ASSERT(m_alreadyStarted);
if (sourceCode.isEmpty())
return;
RefPtrWillBeRawPtr<Document> elementDocument(m_element->document());
RefPtrWillBeRawPtr<Document> contextDocument = elementDocument->contextDocument().get();
if (!contextDocument)
return;
LocalFrame* frame = contextDocument->frame();
const ContentSecurityPolicy* csp = elementDocument->contentSecurityPolicy();
bool shouldBypassMainWorldCSP = (frame && frame->script().shouldBypassMainWorldCSP())
|| csp->allowScriptWithNonce(m_element->fastGetAttribute(HTMLNames::nonceAttr))
|| csp->allowScriptWithHash(sourceCode.source());
if (!m_isExternalScript && (!shouldBypassMainWorldCSP && !csp->allowInlineScript(elementDocument->url(), m_startLineNumber)))
return;
if (m_isExternalScript) {
ScriptResource* resource = m_resource ? m_resource.get() : sourceCode.resource();
if (resource && !resource->mimeTypeAllowedByNosniff()) {
contextDocument->addConsoleMessage(ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, "Refused to execute script from '" + resource->url().elidedString() + "' because its MIME type ('" + resource->mimeType() + "') is not executable, and strict MIME type checking is enabled."));
return;
}
if (!SubresourceIntegrity::CheckSubresourceIntegrity(*m_element, sourceCode.source(), sourceCode.resource()->url(), sourceCode.resource()->mimeType()))
return;
}
// FIXME: Can this be moved earlier in the function?
// Why are we ever attempting to execute scripts without a frame?
if (!frame)
return;
const bool isImportedScript = contextDocument != elementDocument;
// http://www.whatwg.org/specs/web-apps/current-work/#execute-the-script-block step 2.3
// with additional support for HTML imports.
IgnoreDestructiveWriteCountIncrementer ignoreDestructiveWriteCountIncrementer(m_isExternalScript || isImportedScript ? contextDocument.get() : 0);
if (isHTMLScriptLoader(m_element))
contextDocument->pushCurrentScript(toHTMLScriptElement(m_element));
AccessControlStatus corsCheck = NotSharableCrossOrigin;
if (!m_isExternalScript || (sourceCode.resource() && sourceCode.resource()->passesAccessControlCheck(&m_element->document(), m_element->document().securityOrigin())))
corsCheck = SharableCrossOrigin;
// Create a script from the script element node, using the script
// block's source and the script block's type.
// Note: This is where the script is compiled and actually executed.
frame->script().executeScriptInMainWorld(sourceCode, corsCheck, compilationFinishTime);
if (isHTMLScriptLoader(m_element)) {
ASSERT(contextDocument->currentScript() == m_element);
contextDocument->popCurrentScript();
}
}
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();
const ContentSecurityPolicy* csp = elementDocument->contentSecurityPolicy();
bool shouldBypassMainWorldCSP =
(frame && frame->script().shouldBypassMainWorldCSP()) ||
csp->allowScriptWithHash(sourceCode.source(),
ContentSecurityPolicy::InlineType::Block);
AtomicString nonce =
ContentSecurityPolicy::isNonceableElement(m_element.get())
? m_element->fastGetAttribute(HTMLNames::nonceAttr)
: AtomicString();
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 (!resource->mimeTypeAllowedByNosniff()) {
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);
}
}
// FIXME: Can this be moved earlier in the function?
// Why are we ever attempting to execute scripts without a frame?
if (!frame)
return true;
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;
// http://www.whatwg.org/specs/web-apps/current-work/#execute-the-script-block
// step 2.3 with additional support for HTML imports.
IgnoreDestructiveWriteCountIncrementer ignoreDestructiveWriteCountIncrementer(
m_isExternalScript || isImportedScript ? contextDocument : 0);
if (isHTMLScriptLoader(m_element) || isSVGScriptLoader(m_element))
contextDocument->pushCurrentScript(m_element);
// Create a script from the script element node, using the script
// block's source and the script block's type.
// Note: This is where the script is compiled and actually executed.
frame->script().executeScriptInMainWorld(sourceCode, accessControlStatus);
if (isHTMLScriptLoader(m_element) || isSVGScriptLoader(m_element)) {
DCHECK(contextDocument->currentScript() == m_element);
contextDocument->popCurrentScript();
}
return true;
}