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gecko/content/base/src/nsScriptLoader.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim: ft=cpp tw=78 sw=2 et ts=2
/* 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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* A class that handles loading and evaluation of <script> elements.
*/
#include "jsapi.h"
#include "jsfriendapi.h"
#include "nsScriptLoader.h"
#include "nsICharsetConverterManager.h"
#include "nsIUnicodeDecoder.h"
#include "nsIContent.h"
#include "mozilla/dom/Element.h"
#include "nsGkAtoms.h"
#include "nsNetUtil.h"
#include "nsIScriptGlobalObject.h"
#include "nsIScriptContext.h"
#include "nsIScriptRuntime.h"
#include "nsIScriptSecurityManager.h"
#include "nsIPrincipal.h"
#include "nsContentPolicyUtils.h"
#include "nsIHttpChannel.h"
#include "nsIScriptElement.h"
#include "nsIDOMHTMLScriptElement.h"
#include "nsIDocShell.h"
#include "nsContentUtils.h"
#include "nsUnicharUtils.h"
#include "nsAutoPtr.h"
#include "nsIXPConnect.h"
#include "nsError.h"
#include "nsThreadUtils.h"
#include "nsDocShellCID.h"
#include "nsIContentSecurityPolicy.h"
#include "prlog.h"
#include "nsIChannelPolicy.h"
#include "nsChannelPolicy.h"
#include "nsCRT.h"
#include "nsContentCreatorFunctions.h"
#include "nsGenericElement.h"
#include "nsCrossSiteListenerProxy.h"
#include "nsSandboxFlags.h"
#include "mozilla/CORSMode.h"
#include "mozilla/Attributes.h"
#ifdef PR_LOGGING
static PRLogModuleInfo* gCspPRLog;
#endif
using namespace mozilla;
using namespace mozilla::dom;
//////////////////////////////////////////////////////////////
// Per-request data structure
//////////////////////////////////////////////////////////////
class nsScriptLoadRequest MOZ_FINAL : public nsISupports {
public:
nsScriptLoadRequest(nsIScriptElement* aElement,
uint32_t aVersion,
CORSMode aCORSMode)
: mElement(aElement),
mLoading(true),
mIsInline(true),
mJSVersion(aVersion),
mLineNo(1),
mCORSMode(aCORSMode)
{
}
NS_DECL_ISUPPORTS
void FireScriptAvailable(nsresult aResult)
{
mElement->ScriptAvailable(aResult, mElement, mIsInline, mURI, mLineNo);
}
void FireScriptEvaluated(nsresult aResult)
{
mElement->ScriptEvaluated(aResult, mElement, mIsInline);
}
bool IsPreload()
{
return mElement == nullptr;
}
nsCOMPtr<nsIScriptElement> mElement;
bool mLoading; // Are we still waiting for a load to complete?
bool mIsInline; // Is the script inline or loaded?
nsString mScriptText; // Holds script for loaded scripts
uint32_t mJSVersion;
nsCOMPtr<nsIURI> mURI;
nsCOMPtr<nsIPrincipal> mOriginPrincipal;
int32_t mLineNo;
const CORSMode mCORSMode;
};
// The nsScriptLoadRequest is passed as the context to necko, and thus
// it needs to be threadsafe. Necko won't do anything with this
// context, but it will AddRef and Release it on other threads.
NS_IMPL_THREADSAFE_ISUPPORTS0(nsScriptLoadRequest)
//////////////////////////////////////////////////////////////
//
//////////////////////////////////////////////////////////////
nsScriptLoader::nsScriptLoader(nsIDocument *aDocument)
: mDocument(aDocument),
mBlockerCount(0),
mEnabled(true),
mDeferEnabled(false),
mDocumentParsingDone(false)
{
// enable logging for CSP
#ifdef PR_LOGGING
if (!gCspPRLog)
gCspPRLog = PR_NewLogModule("CSP");
#endif
}
nsScriptLoader::~nsScriptLoader()
{
mObservers.Clear();
if (mParserBlockingRequest) {
mParserBlockingRequest->FireScriptAvailable(NS_ERROR_ABORT);
}
for (uint32_t i = 0; i < mXSLTRequests.Length(); i++) {
mXSLTRequests[i]->FireScriptAvailable(NS_ERROR_ABORT);
}
for (uint32_t i = 0; i < mDeferRequests.Length(); i++) {
mDeferRequests[i]->FireScriptAvailable(NS_ERROR_ABORT);
}
for (uint32_t i = 0; i < mAsyncRequests.Length(); i++) {
mAsyncRequests[i]->FireScriptAvailable(NS_ERROR_ABORT);
}
for (uint32_t i = 0; i < mNonAsyncExternalScriptInsertedRequests.Length(); i++) {
mNonAsyncExternalScriptInsertedRequests[i]->FireScriptAvailable(NS_ERROR_ABORT);
}
// Unblock the kids, in case any of them moved to a different document
// subtree in the meantime and therefore aren't actually going away.
for (uint32_t j = 0; j < mPendingChildLoaders.Length(); ++j) {
mPendingChildLoaders[j]->RemoveExecuteBlocker();
}
}
NS_IMPL_ISUPPORTS1(nsScriptLoader, nsIStreamLoaderObserver)
// Helper method for checking if the script element is an event-handler
// This means that it has both a for-attribute and a event-attribute.
// Also, if the for-attribute has a value that matches "\s*window\s*",
// and the event-attribute matches "\s*onload([ \(].*)?" then it isn't an
// eventhandler. (both matches are case insensitive).
// This is how IE seems to filter out a window's onload handler from a
// <script for=... event=...> element.
static bool
IsScriptEventHandler(nsIContent* aScriptElement)
{
if (!aScriptElement->IsHTML()) {
return false;
}
nsAutoString forAttr, eventAttr;
if (!aScriptElement->GetAttr(kNameSpaceID_None, nsGkAtoms::_for, forAttr) ||
!aScriptElement->GetAttr(kNameSpaceID_None, nsGkAtoms::event, eventAttr)) {
return false;
}
const nsAString& for_str =
nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(forAttr);
if (!for_str.LowerCaseEqualsLiteral("window")) {
return true;
}
// We found for="window", now check for event="onload".
const nsAString& event_str =
nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(eventAttr, false);
if (!StringBeginsWith(event_str, NS_LITERAL_STRING("onload"),
nsCaseInsensitiveStringComparator())) {
// It ain't "onload.*".
return true;
}
nsAutoString::const_iterator start, end;
event_str.BeginReading(start);
event_str.EndReading(end);
start.advance(6); // advance past "onload"
if (start != end && *start != '(' && *start != ' ') {
// We got onload followed by something other than space or
// '('. Not good enough.
return true;
}
return false;
}
nsresult
nsScriptLoader::CheckContentPolicy(nsIDocument* aDocument,
nsISupports *aContext,
nsIURI *aURI,
const nsAString &aType)
{
int16_t shouldLoad = nsIContentPolicy::ACCEPT;
nsresult rv = NS_CheckContentLoadPolicy(nsIContentPolicy::TYPE_SCRIPT,
aURI,
aDocument->NodePrincipal(),
aContext,
NS_LossyConvertUTF16toASCII(aType),
nullptr, //extra
&shouldLoad,
nsContentUtils::GetContentPolicy(),
nsContentUtils::GetSecurityManager());
if (NS_FAILED(rv) || NS_CP_REJECTED(shouldLoad)) {
if (NS_FAILED(rv) || shouldLoad != nsIContentPolicy::REJECT_TYPE) {
return NS_ERROR_CONTENT_BLOCKED;
}
return NS_ERROR_CONTENT_BLOCKED_SHOW_ALT;
}
return NS_OK;
}
nsresult
nsScriptLoader::ShouldLoadScript(nsIDocument* aDocument,
nsISupports* aContext,
nsIURI* aURI,
const nsAString &aType)
{
// Check that the containing page is allowed to load this URI.
nsresult rv = nsContentUtils::GetSecurityManager()->
CheckLoadURIWithPrincipal(aDocument->NodePrincipal(), aURI,
nsIScriptSecurityManager::ALLOW_CHROME);
NS_ENSURE_SUCCESS(rv, rv);
// After the security manager, the content-policy stuff gets a veto
rv = CheckContentPolicy(aDocument, aContext, aURI, aType);
if (NS_FAILED(rv)) {
return rv;
}
return NS_OK;
}
nsresult
nsScriptLoader::StartLoad(nsScriptLoadRequest *aRequest, const nsAString &aType)
{
nsISupports *context = aRequest->mElement.get()
? static_cast<nsISupports *>(aRequest->mElement.get())
: static_cast<nsISupports *>(mDocument);
nsresult rv = ShouldLoadScript(mDocument, context, aRequest->mURI, aType);
if (NS_FAILED(rv)) {
return rv;
}
nsCOMPtr<nsILoadGroup> loadGroup = mDocument->GetDocumentLoadGroup();
nsCOMPtr<nsPIDOMWindow> window(do_QueryInterface(mDocument->GetScriptGlobalObject()));
if (!window) {
return NS_ERROR_NULL_POINTER;
}
nsIDocShell *docshell = window->GetDocShell();
nsCOMPtr<nsIInterfaceRequestor> prompter(do_QueryInterface(docshell));
// If this document is sandboxed without 'allow-scripts', abort.
if (mDocument->GetSandboxFlags() & SANDBOXED_SCRIPTS) {
return NS_OK;
}
// check for a Content Security Policy to pass down to the channel
// that will be created to load the script
nsCOMPtr<nsIChannelPolicy> channelPolicy;
nsCOMPtr<nsIContentSecurityPolicy> csp;
rv = mDocument->NodePrincipal()->GetCsp(getter_AddRefs(csp));
NS_ENSURE_SUCCESS(rv, rv);
if (csp) {
channelPolicy = do_CreateInstance("@mozilla.org/nschannelpolicy;1");
channelPolicy->SetContentSecurityPolicy(csp);
channelPolicy->SetLoadType(nsIContentPolicy::TYPE_SCRIPT);
}
nsCOMPtr<nsIChannel> channel;
rv = NS_NewChannel(getter_AddRefs(channel),
aRequest->mURI, nullptr, loadGroup, prompter,
nsIRequest::LOAD_NORMAL | nsIChannel::LOAD_CLASSIFY_URI,
channelPolicy);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel));
if (httpChannel) {
// HTTP content negotation has little value in this context.
httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"),
NS_LITERAL_CSTRING("*/*"),
false);
httpChannel->SetReferrer(mDocument->GetDocumentURI());
}
nsCOMPtr<nsIStreamLoader> loader;
rv = NS_NewStreamLoader(getter_AddRefs(loader), this);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIStreamListener> listener = loader.get();
if (aRequest->mCORSMode != CORS_NONE) {
bool withCredentials = (aRequest->mCORSMode == CORS_USE_CREDENTIALS);
nsRefPtr<nsCORSListenerProxy> corsListener =
new nsCORSListenerProxy(listener, mDocument->NodePrincipal(),
withCredentials);
rv = corsListener->Init(channel);
NS_ENSURE_SUCCESS(rv, rv);
listener = corsListener;
}
rv = channel->AsyncOpen(listener, aRequest);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
bool
nsScriptLoader::PreloadURIComparator::Equals(const PreloadInfo &aPi,
nsIURI * const &aURI) const
{
bool same;
return NS_SUCCEEDED(aPi.mRequest->mURI->Equals(aURI, &same)) &&
same;
}
class nsScriptRequestProcessor : public nsRunnable
{
private:
nsRefPtr<nsScriptLoader> mLoader;
nsRefPtr<nsScriptLoadRequest> mRequest;
public:
nsScriptRequestProcessor(nsScriptLoader* aLoader,
nsScriptLoadRequest* aRequest)
: mLoader(aLoader)
, mRequest(aRequest)
{}
NS_IMETHODIMP Run()
{
return mLoader->ProcessRequest(mRequest);
}
};
static inline bool
ParseTypeAttribute(const nsAString& aType, JSVersion* aVersion)
{
MOZ_ASSERT(!aType.IsEmpty());
MOZ_ASSERT(aVersion);
MOZ_ASSERT(*aVersion == JSVERSION_DEFAULT);
nsContentTypeParser parser(aType);
nsAutoString mimeType;
nsresult rv = parser.GetType(mimeType);
NS_ENSURE_SUCCESS(rv, false);
if (!nsContentUtils::IsJavascriptMIMEType(mimeType)) {
return false;
}
// Get the version string, and ensure the language supports it.
nsAutoString versionName;
rv = parser.GetParameter("version", versionName);
if (NS_SUCCEEDED(rv)) {
*aVersion = nsContentUtils::ParseJavascriptVersion(versionName);
} else if (rv != NS_ERROR_INVALID_ARG) {
return false;
}
nsAutoString value;
rv = parser.GetParameter("e4x", value);
if (NS_SUCCEEDED(rv)) {
if (value.Length() == 1 && value[0] == '1') {
// This happens in about 2 web pages. Enable E4X no matter what JS
// version number was selected. We do this by turning on the "moar
// XML" version bit. This is OK even if version has
// JSVERSION_UNKNOWN (-1).
*aVersion = js::VersionSetMoarXML(*aVersion, true);
}
} else if (rv != NS_ERROR_INVALID_ARG) {
return false;
}
return true;
}
bool
nsScriptLoader::ProcessScriptElement(nsIScriptElement *aElement)
{
// We need a document to evaluate scripts.
NS_ENSURE_TRUE(mDocument, false);
// Check to see if scripts has been turned off.
if (!mEnabled || !mDocument->IsScriptEnabled()) {
return false;
}
NS_ASSERTION(!aElement->IsMalformed(), "Executing malformed script");
nsCOMPtr<nsIContent> scriptContent = do_QueryInterface(aElement);
// Step 12. Check that the script is not an eventhandler
if (IsScriptEventHandler(scriptContent)) {
return false;
}
// Script evaluation can also be disabled in the current script
// context even though it's enabled in the document.
// XXX - still hard-coded for JS here, even though another language
// may be specified. Should this check be made *after* we examine
// the attributes to locate the script-type?
// For now though, if JS is disabled we assume every language is
// disabled.
// XXX is this different from the mDocument->IsScriptEnabled() call?
nsIScriptGlobalObject *globalObject = mDocument->GetScriptGlobalObject();
if (!globalObject) {
return false;
}
nsIScriptContext *context = globalObject->GetScriptContext();
// If scripts aren't enabled in the current context, there's no
// point in going on.
if (!context || !context->GetScriptsEnabled()) {
return false;
}
JSVersion version = JSVERSION_DEFAULT;
// Check the type attribute to determine language and version.
// If type exists, it trumps the deprecated 'language='
nsAutoString type;
aElement->GetScriptType(type);
if (!type.IsEmpty()) {
NS_ENSURE_TRUE(ParseTypeAttribute(type, &version), false);
} else {
// no 'type=' element
// "language" is a deprecated attribute of HTML, so we check it only for
// HTML script elements.
if (scriptContent->IsHTML()) {
nsAutoString language;
scriptContent->GetAttr(kNameSpaceID_None, nsGkAtoms::language, language);
if (!language.IsEmpty()) {
// IE, Opera, etc. do not respect language version, so neither should
// we at this late date in the browser wars saga. Note that this change
// affects HTML but not XUL or SVG (but note also that XUL has its own
// code to check nsContentUtils::IsJavaScriptLanguage -- that's probably
// a separate bug, one we may not be able to fix short of XUL2). See
// bug 255895 (https://bugzilla.mozilla.org/show_bug.cgi?id=255895).
uint32_t dummy;
if (!nsContentUtils::IsJavaScriptLanguage(language, &dummy)) {
return false;
}
}
}
}
// Step 14. in the HTML5 spec
nsresult rv = NS_OK;
nsRefPtr<nsScriptLoadRequest> request;
if (aElement->GetScriptExternal()) {
// external script
nsCOMPtr<nsIURI> scriptURI = aElement->GetScriptURI();
if (!scriptURI) {
// Asynchronously report the failure to create a URI object
NS_DispatchToCurrentThread(
NS_NewRunnableMethod(aElement,
&nsIScriptElement::FireErrorEvent));
return false;
}
CORSMode ourCORSMode = aElement->GetCORSMode();
nsTArray<PreloadInfo>::index_type i =
mPreloads.IndexOf(scriptURI.get(), 0, PreloadURIComparator());
if (i != nsTArray<PreloadInfo>::NoIndex) {
// preloaded
// note that a script-inserted script can steal a preload!
request = mPreloads[i].mRequest;
request->mElement = aElement;
nsString preloadCharset(mPreloads[i].mCharset);
mPreloads.RemoveElementAt(i);
// Double-check that the charset the preload used is the same as
// the charset we have now.
nsAutoString elementCharset;
aElement->GetScriptCharset(elementCharset);
if (elementCharset.Equals(preloadCharset) &&
ourCORSMode == request->mCORSMode) {
rv = CheckContentPolicy(mDocument, aElement, request->mURI, type);
NS_ENSURE_SUCCESS(rv, false);
} else {
// Drop the preload
request = nullptr;
}
}
if (!request) {
// no usable preload
request = new nsScriptLoadRequest(aElement, version, ourCORSMode);
request->mURI = scriptURI;
request->mIsInline = false;
request->mLoading = true;
rv = StartLoad(request, type);
if (NS_FAILED(rv)) {
// Asynchronously report the load failure
NS_DispatchToCurrentThread(
NS_NewRunnableMethod(aElement,
&nsIScriptElement::FireErrorEvent));
return false;
}
}
request->mJSVersion = version;
if (aElement->GetScriptAsync()) {
mAsyncRequests.AppendElement(request);
if (!request->mLoading) {
// The script is available already. Run it ASAP when the event
// loop gets a chance to spin.
ProcessPendingRequestsAsync();
}
return false;
}
if (!aElement->GetParserCreated()) {
// Violate the HTML5 spec in order to make LABjs and the "order" plug-in
// for RequireJS work with their Gecko-sniffed code path. See
// http://lists.w3.org/Archives/Public/public-html/2010Oct/0088.html
mNonAsyncExternalScriptInsertedRequests.AppendElement(request);
if (!request->mLoading) {
// The script is available already. Run it ASAP when the event
// loop gets a chance to spin.
ProcessPendingRequestsAsync();
}
return false;
}
// we now have a parser-inserted request that may or may not be still
// loading
if (aElement->GetScriptDeferred()) {
// We don't want to run this yet.
// If we come here, the script is a parser-created script and it has
// the defer attribute but not the async attribute. Since a
// a parser-inserted script is being run, we came here by the parser
// running the script, which means the parser is still alive and the
// parse is ongoing.
NS_ASSERTION(mDocument->GetCurrentContentSink() ||
aElement->GetParserCreated() == FROM_PARSER_XSLT,
"Non-XSLT Defer script on a document without an active parser; bug 592366.");
mDeferRequests.AppendElement(request);
return false;
}
if (aElement->GetParserCreated() == FROM_PARSER_XSLT) {
// Need to maintain order for XSLT-inserted scripts
NS_ASSERTION(!mParserBlockingRequest,
"Parser-blocking scripts and XSLT scripts in the same doc!");
mXSLTRequests.AppendElement(request);
if (!request->mLoading) {
// The script is available already. Run it ASAP when the event
// loop gets a chance to spin.
ProcessPendingRequestsAsync();
}
return true;
}
if (!request->mLoading && ReadyToExecuteScripts()) {
// The request has already been loaded and there are no pending style
// sheets. If the script comes from the network stream, cheat for
// performance reasons and avoid a trip through the event loop.
if (aElement->GetParserCreated() == FROM_PARSER_NETWORK) {
return ProcessRequest(request) == NS_ERROR_HTMLPARSER_BLOCK;
}
// Otherwise, we've got a document.written script, make a trip through
// the event loop to hide the preload effects from the scripts on the
// Web page.
NS_ASSERTION(!mParserBlockingRequest,
"There can be only one parser-blocking script at a time");
NS_ASSERTION(mXSLTRequests.IsEmpty(),
"Parser-blocking scripts and XSLT scripts in the same doc!");
mParserBlockingRequest = request;
ProcessPendingRequestsAsync();
return true;
}
// The script hasn't loaded yet or there's a style sheet blocking it.
// The script will be run when it loads or the style sheet loads.
NS_ASSERTION(!mParserBlockingRequest,
"There can be only one parser-blocking script at a time");
NS_ASSERTION(mXSLTRequests.IsEmpty(),
"Parser-blocking scripts and XSLT scripts in the same doc!");
mParserBlockingRequest = request;
return true;
}
// inline script
// Is this document sandboxed without 'allow-scripts'?
if (mDocument->GetSandboxFlags() & SANDBOXED_SCRIPTS) {
return false;
}
nsCOMPtr<nsIContentSecurityPolicy> csp;
rv = mDocument->NodePrincipal()->GetCsp(getter_AddRefs(csp));
NS_ENSURE_SUCCESS(rv, false);
if (csp) {
PR_LOG(gCspPRLog, PR_LOG_DEBUG, ("New ScriptLoader i ****with CSP****"));
bool inlineOK;
rv = csp->GetAllowsInlineScript(&inlineOK);
NS_ENSURE_SUCCESS(rv, false);
if (!inlineOK) {
PR_LOG(gCspPRLog, PR_LOG_DEBUG, ("CSP blocked inline scripts (2)"));
// gather information to log with violation report
nsIURI* uri = mDocument->GetDocumentURI();
nsAutoCString asciiSpec;
uri->GetAsciiSpec(asciiSpec);
nsAutoString scriptText;
aElement->GetScriptText(scriptText);
// cap the length of the script sample at 40 chars
if (scriptText.Length() > 40) {
scriptText.Truncate(40);
scriptText.Append(NS_LITERAL_STRING("..."));
}
csp->LogViolationDetails(nsIContentSecurityPolicy::VIOLATION_TYPE_INLINE_SCRIPT,
NS_ConvertUTF8toUTF16(asciiSpec),
scriptText,
aElement->GetScriptLineNumber());
return false;
}
}
// Inline scripts ignore ther CORS mode and are always CORS_NONE
request = new nsScriptLoadRequest(aElement, version, CORS_NONE);
request->mJSVersion = version;
request->mLoading = false;
request->mIsInline = true;
request->mURI = mDocument->GetDocumentURI();
request->mLineNo = aElement->GetScriptLineNumber();
if (aElement->GetParserCreated() == FROM_PARSER_XSLT &&
(!ReadyToExecuteScripts() || !mXSLTRequests.IsEmpty())) {
// Need to maintain order for XSLT-inserted scripts
NS_ASSERTION(!mParserBlockingRequest,
"Parser-blocking scripts and XSLT scripts in the same doc!");
mXSLTRequests.AppendElement(request);
return true;
}
if (aElement->GetParserCreated() == NOT_FROM_PARSER) {
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"A script-inserted script is inserted without an update batch?");
nsContentUtils::AddScriptRunner(new nsScriptRequestProcessor(this,
request));
return false;
}
if (aElement->GetParserCreated() == FROM_PARSER_NETWORK &&
!ReadyToExecuteScripts()) {
NS_ASSERTION(!mParserBlockingRequest,
"There can be only one parser-blocking script at a time");
mParserBlockingRequest = request;
NS_ASSERTION(mXSLTRequests.IsEmpty(),
"Parser-blocking scripts and XSLT scripts in the same doc!");
return true;
}
// We now have a document.written inline script or we have an inline script
// from the network but there is no style sheet that is blocking scripts.
// Don't check for style sheets blocking scripts in the document.write
// case to avoid style sheet network activity affecting when
// document.write returns. It's not really necessary to do this if
// there's no document.write currently on the call stack. However,
// this way matches IE more closely than checking if document.write
// is on the call stack.
NS_ASSERTION(nsContentUtils::IsSafeToRunScript(),
"Not safe to run a parser-inserted script?");
return ProcessRequest(request) == NS_ERROR_HTMLPARSER_BLOCK;
}
nsresult
nsScriptLoader::ProcessRequest(nsScriptLoadRequest* aRequest)
{
NS_ASSERTION(nsContentUtils::IsSafeToRunScript(),
"Processing requests when running scripts is unsafe.");
NS_ENSURE_ARG(aRequest);
nsAFlatString* script;
nsAutoString textData;
nsCOMPtr<nsIDocument> doc;
nsCOMPtr<nsINode> scriptElem = do_QueryInterface(aRequest->mElement);
// If there's no script text, we try to get it from the element
if (aRequest->mIsInline) {
// XXX This is inefficient - GetText makes multiple
// copies.
aRequest->mElement->GetScriptText(textData);
script = &textData;
}
else {
script = &aRequest->mScriptText;
doc = scriptElem->OwnerDoc();
}
nsCOMPtr<nsIScriptElement> oldParserInsertedScript;
uint32_t parserCreated = aRequest->mElement->GetParserCreated();
if (parserCreated) {
oldParserInsertedScript = mCurrentParserInsertedScript;
mCurrentParserInsertedScript = aRequest->mElement;
}
FireScriptAvailable(NS_OK, aRequest);
bool runScript = true;
nsContentUtils::DispatchTrustedEvent(scriptElem->OwnerDoc(),
scriptElem,
NS_LITERAL_STRING("beforescriptexecute"),
true, true, &runScript);
nsresult rv = NS_OK;
if (runScript) {
if (doc) {
doc->BeginEvaluatingExternalScript();
}
aRequest->mElement->BeginEvaluating();
rv = EvaluateScript(aRequest, *script);
aRequest->mElement->EndEvaluating();
if (doc) {
doc->EndEvaluatingExternalScript();
}
nsContentUtils::DispatchTrustedEvent(scriptElem->OwnerDoc(),
scriptElem,
NS_LITERAL_STRING("afterscriptexecute"),
true, false);
}
FireScriptEvaluated(rv, aRequest);
if (parserCreated) {
mCurrentParserInsertedScript = oldParserInsertedScript;
}
return rv;
}
void
nsScriptLoader::FireScriptAvailable(nsresult aResult,
nsScriptLoadRequest* aRequest)
{
for (int32_t i = 0; i < mObservers.Count(); i++) {
nsCOMPtr<nsIScriptLoaderObserver> obs = mObservers[i];
obs->ScriptAvailable(aResult, aRequest->mElement,
aRequest->mIsInline, aRequest->mURI,
aRequest->mLineNo);
}
aRequest->FireScriptAvailable(aResult);
}
void
nsScriptLoader::FireScriptEvaluated(nsresult aResult,
nsScriptLoadRequest* aRequest)
{
for (int32_t i = 0; i < mObservers.Count(); i++) {
nsCOMPtr<nsIScriptLoaderObserver> obs = mObservers[i];
obs->ScriptEvaluated(aResult, aRequest->mElement,
aRequest->mIsInline);
}
aRequest->FireScriptEvaluated(aResult);
}
nsresult
nsScriptLoader::EvaluateScript(nsScriptLoadRequest* aRequest,
const nsAFlatString& aScript)
{
nsresult rv = NS_OK;
// We need a document to evaluate scripts.
if (!mDocument) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIContent> scriptContent(do_QueryInterface(aRequest->mElement));
nsIDocument* ownerDoc = scriptContent->OwnerDoc();
if (ownerDoc != mDocument) {
// Willful violation of HTML5 as of 2010-12-01
return NS_ERROR_FAILURE;
}
nsPIDOMWindow *pwin = mDocument->GetInnerWindow();
if (!pwin || !pwin->IsInnerWindow()) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIScriptGlobalObject> globalObject = do_QueryInterface(pwin);
NS_ASSERTION(globalObject, "windows must be global objects");
// Get the script-type to be used by this element.
NS_ASSERTION(scriptContent, "no content - what is default script-type?");
// and make sure we are setup for this type of script.
rv = globalObject->EnsureScriptEnvironment();
if (NS_FAILED(rv))
return rv;
// Make sure context is a strong reference since we access it after
// we've executed a script, which may cause all other references to
// the context to go away.
nsCOMPtr<nsIScriptContext> context = globalObject->GetScriptContext();
if (!context) {
return NS_ERROR_FAILURE;
}
// Update our current script.
nsCOMPtr<nsIScriptElement> oldCurrent = mCurrentScript;
mCurrentScript = aRequest->mElement;
// It's very important to use aRequest->mURI, not the final URI of the channel
// aRequest ended up getting script data from, as the script filename.
nsAutoCString url;
nsContentUtils::GetWrapperSafeScriptFilename(mDocument, aRequest->mURI, url);
bool isUndefined;
rv = context->EvaluateString(aScript, globalObject->GetGlobalJSObject(),
mDocument->NodePrincipal(),
aRequest->mOriginPrincipal,
url.get(), aRequest->mLineNo,
JSVersion(aRequest->mJSVersion), nullptr,
&isUndefined);
// Put the old script back in case it wants to do anything else.
mCurrentScript = oldCurrent;
return rv;
}
void
nsScriptLoader::ProcessPendingRequestsAsync()
{
if (mParserBlockingRequest || !mPendingChildLoaders.IsEmpty()) {
nsCOMPtr<nsIRunnable> ev = NS_NewRunnableMethod(this,
&nsScriptLoader::ProcessPendingRequests);
NS_DispatchToCurrentThread(ev);
}
}
void
nsScriptLoader::ProcessPendingRequests()
{
nsRefPtr<nsScriptLoadRequest> request;
if (mParserBlockingRequest &&
!mParserBlockingRequest->mLoading &&
ReadyToExecuteScripts()) {
request.swap(mParserBlockingRequest);
UnblockParser(request);
ProcessRequest(request);
ContinueParserAsync(request);
}
while (ReadyToExecuteScripts() &&
!mXSLTRequests.IsEmpty() &&
!mXSLTRequests[0]->mLoading) {
request.swap(mXSLTRequests[0]);
mXSLTRequests.RemoveElementAt(0);
ProcessRequest(request);
}
uint32_t i = 0;
while (mEnabled && i < mAsyncRequests.Length()) {
if (!mAsyncRequests[i]->mLoading) {
request.swap(mAsyncRequests[i]);
mAsyncRequests.RemoveElementAt(i);
ProcessRequest(request);
continue;
}
++i;
}
while (mEnabled && !mNonAsyncExternalScriptInsertedRequests.IsEmpty() &&
!mNonAsyncExternalScriptInsertedRequests[0]->mLoading) {
// Violate the HTML5 spec and execute these in the insertion order in
// order to make LABjs and the "order" plug-in for RequireJS work with
// their Gecko-sniffed code path. See
// http://lists.w3.org/Archives/Public/public-html/2010Oct/0088.html
request.swap(mNonAsyncExternalScriptInsertedRequests[0]);
mNonAsyncExternalScriptInsertedRequests.RemoveElementAt(0);
ProcessRequest(request);
}
if (mDocumentParsingDone && mXSLTRequests.IsEmpty()) {
while (!mDeferRequests.IsEmpty() && !mDeferRequests[0]->mLoading) {
request.swap(mDeferRequests[0]);
mDeferRequests.RemoveElementAt(0);
ProcessRequest(request);
}
}
while (!mPendingChildLoaders.IsEmpty() && ReadyToExecuteScripts()) {
nsRefPtr<nsScriptLoader> child = mPendingChildLoaders[0];
mPendingChildLoaders.RemoveElementAt(0);
child->RemoveExecuteBlocker();
}
if (mDocumentParsingDone && mDocument &&
!mParserBlockingRequest && mAsyncRequests.IsEmpty() &&
mNonAsyncExternalScriptInsertedRequests.IsEmpty() &&
mXSLTRequests.IsEmpty() && mDeferRequests.IsEmpty()) {
// No more pending scripts; time to unblock onload.
// OK to unblock onload synchronously here, since callers must be
// prepared for the world changing anyway.
mDocumentParsingDone = false;
mDocument->UnblockOnload(true);
}
}
bool
nsScriptLoader::ReadyToExecuteScripts()
{
// Make sure the SelfReadyToExecuteScripts check is first, so that
// we don't block twice on an ancestor.
if (!SelfReadyToExecuteScripts()) {
return false;
}
for (nsIDocument* doc = mDocument; doc; doc = doc->GetParentDocument()) {
nsScriptLoader* ancestor = doc->ScriptLoader();
if (!ancestor->SelfReadyToExecuteScripts() &&
ancestor->AddPendingChildLoader(this)) {
AddExecuteBlocker();
return false;
}
}
return true;
}
// This function was copied from nsParser.cpp. It was simplified a bit.
static bool
DetectByteOrderMark(const unsigned char* aBytes, int32_t aLen, nsCString& oCharset)
{
if (aLen < 2)
return false;
switch(aBytes[0]) {
case 0xEF:
if (aLen >= 3 && 0xBB == aBytes[1] && 0xBF == aBytes[2]) {
// EF BB BF
// Win2K UTF-8 BOM
oCharset.Assign("UTF-8");
}
break;
case 0xFE:
if (0xFF == aBytes[1]) {
// FE FF
// UTF-16, big-endian
oCharset.Assign("UTF-16");
}
break;
case 0xFF:
if (0xFE == aBytes[1]) {
// FF FE
// UTF-16, little-endian
oCharset.Assign("UTF-16");
}
break;
}
return !oCharset.IsEmpty();
}
/* static */ nsresult
nsScriptLoader::ConvertToUTF16(nsIChannel* aChannel, const uint8_t* aData,
uint32_t aLength, const nsAString& aHintCharset,
nsIDocument* aDocument, nsString& aString)
{
if (!aLength) {
aString.Truncate();
return NS_OK;
}
// The encoding info precedence is as follows from high to low:
// The BOM
// HTTP Content-Type (if name recognized)
// charset attribute (if name recognized)
// The encoding of the document
nsAutoCString charset;
nsCOMPtr<nsICharsetConverterManager> charsetConv =
do_GetService(NS_CHARSETCONVERTERMANAGER_CONTRACTID);
nsCOMPtr<nsIUnicodeDecoder> unicodeDecoder;
if (DetectByteOrderMark(aData, aLength, charset)) {
// charset is now "UTF-8" or "UTF-16". The UTF-16 decoder will re-sniff
// the BOM for endianness. Both the UTF-16 and the UTF-8 decoder will
// take care of swallowing the BOM.
charsetConv->GetUnicodeDecoderRaw(charset.get(),
getter_AddRefs(unicodeDecoder));
}
if (!unicodeDecoder &&
aChannel &&
NS_SUCCEEDED(aChannel->GetContentCharset(charset))) {
charsetConv->GetUnicodeDecoder(charset.get(),
getter_AddRefs(unicodeDecoder));
}
if (!unicodeDecoder && !aHintCharset.IsEmpty()) {
CopyUTF16toUTF8(aHintCharset, charset);
charsetConv->GetUnicodeDecoder(charset.get(),
getter_AddRefs(unicodeDecoder));
}
if (!unicodeDecoder && aDocument) {
charset = aDocument->GetDocumentCharacterSet();
charsetConv->GetUnicodeDecoderRaw(charset.get(),
getter_AddRefs(unicodeDecoder));
}
if (!unicodeDecoder) {
// Curiously, there are various callers that don't pass aDocument. The
// fallback in the old code was ISO-8859-1, which behaved like
// windows-1252. Saying windows-1252 for clarity and for compliance
// with the Encoding Standard.
charsetConv->GetUnicodeDecoderRaw("windows-1252",
getter_AddRefs(unicodeDecoder));
}
int32_t unicodeLength = 0;
nsresult rv =
unicodeDecoder->GetMaxLength(reinterpret_cast<const char*>(aData),
aLength, &unicodeLength);
NS_ENSURE_SUCCESS(rv, rv);
if (!EnsureStringLength(aString, unicodeLength)) {
return NS_ERROR_OUT_OF_MEMORY;
}
PRUnichar *ustr = aString.BeginWriting();
int32_t consumedLength = 0;
int32_t originalLength = aLength;
int32_t convertedLength = 0;
int32_t bufferLength = unicodeLength;
do {
rv = unicodeDecoder->Convert(reinterpret_cast<const char*>(aData),
(int32_t *) &aLength, ustr,
&unicodeLength);
if (NS_FAILED(rv)) {
// if we failed, we consume one byte, replace it with U+FFFD
// and try the conversion again.
ustr[unicodeLength++] = (PRUnichar)0xFFFD;
ustr += unicodeLength;
unicodeDecoder->Reset();
}
aData += ++aLength;
consumedLength += aLength;
aLength = originalLength - consumedLength;
convertedLength += unicodeLength;
unicodeLength = bufferLength - convertedLength;
} while (NS_FAILED(rv) &&
(originalLength > consumedLength) &&
(bufferLength > convertedLength));
aString.SetLength(convertedLength);
return rv;
}
NS_IMETHODIMP
nsScriptLoader::OnStreamComplete(nsIStreamLoader* aLoader,
nsISupports* aContext,
nsresult aStatus,
uint32_t aStringLen,
const uint8_t* aString)
{
nsScriptLoadRequest* request = static_cast<nsScriptLoadRequest*>(aContext);
NS_ASSERTION(request, "null request in stream complete handler");
NS_ENSURE_TRUE(request, NS_ERROR_FAILURE);
nsresult rv = PrepareLoadedRequest(request, aLoader, aStatus, aStringLen,
aString);
if (NS_FAILED(rv)) {
if (mDeferRequests.RemoveElement(request) ||
mAsyncRequests.RemoveElement(request) ||
mNonAsyncExternalScriptInsertedRequests.RemoveElement(request) ||
mXSLTRequests.RemoveElement(request)) {
FireScriptAvailable(rv, request);
} else if (mParserBlockingRequest == request) {
mParserBlockingRequest = nullptr;
UnblockParser(request);
FireScriptAvailable(rv, request);
ContinueParserAsync(request);
} else {
mPreloads.RemoveElement(request, PreloadRequestComparator());
}
}
// Process our request and/or any pending ones
ProcessPendingRequests();
return NS_OK;
}
void
nsScriptLoader::UnblockParser(nsScriptLoadRequest* aParserBlockingRequest)
{
aParserBlockingRequest->mElement->UnblockParser();
}
void
nsScriptLoader::ContinueParserAsync(nsScriptLoadRequest* aParserBlockingRequest)
{
aParserBlockingRequest->mElement->ContinueParserAsync();
}
nsresult
nsScriptLoader::PrepareLoadedRequest(nsScriptLoadRequest* aRequest,
nsIStreamLoader* aLoader,
nsresult aStatus,
uint32_t aStringLen,
const uint8_t* aString)
{
if (NS_FAILED(aStatus)) {
return aStatus;
}
// If we don't have a document, then we need to abort further
// evaluation.
if (!mDocument) {
return NS_ERROR_NOT_AVAILABLE;
}
// If the load returned an error page, then we need to abort
nsCOMPtr<nsIRequest> req;
nsresult rv = aLoader->GetRequest(getter_AddRefs(req));
NS_ASSERTION(req, "StreamLoader's request went away prematurely");
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(req);
if (httpChannel) {
bool requestSucceeded;
rv = httpChannel->GetRequestSucceeded(&requestSucceeded);
if (NS_SUCCEEDED(rv) && !requestSucceeded) {
return NS_ERROR_NOT_AVAILABLE;
}
}
nsCOMPtr<nsIChannel> channel = do_QueryInterface(req);
// If this load was subject to a CORS check; don't flag it with a
// separate origin principal, so that it will treat our document's
// principal as the origin principal
if (aRequest->mCORSMode == CORS_NONE) {
rv = nsContentUtils::GetSecurityManager()->
GetChannelPrincipal(channel, getter_AddRefs(aRequest->mOriginPrincipal));
NS_ENSURE_SUCCESS(rv, rv);
}
if (aStringLen) {
// Check the charset attribute to determine script charset.
nsAutoString hintCharset;
if (!aRequest->IsPreload()) {
aRequest->mElement->GetScriptCharset(hintCharset);
} else {
nsTArray<PreloadInfo>::index_type i =
mPreloads.IndexOf(aRequest, 0, PreloadRequestComparator());
NS_ASSERTION(i != mPreloads.NoIndex, "Incorrect preload bookkeeping");
hintCharset = mPreloads[i].mCharset;
}
rv = ConvertToUTF16(channel, aString, aStringLen, hintCharset, mDocument,
aRequest->mScriptText);
NS_ENSURE_SUCCESS(rv, rv);
}
// This assertion could fire errorously if we ran out of memory when
// inserting the request in the array. However it's an unlikely case
// so if you see this assertion it is likely something else that is
// wrong, especially if you see it more than once.
NS_ASSERTION(mDeferRequests.Contains(aRequest) ||
mAsyncRequests.Contains(aRequest) ||
mNonAsyncExternalScriptInsertedRequests.Contains(aRequest) ||
mXSLTRequests.Contains(aRequest) ||
mPreloads.Contains(aRequest, PreloadRequestComparator()) ||
mParserBlockingRequest,
"aRequest should be pending!");
// Mark this as loaded
aRequest->mLoading = false;
return NS_OK;
}
void
nsScriptLoader::ParsingComplete(bool aTerminated)
{
if (mDeferEnabled) {
// Have to check because we apparently get ParsingComplete
// without BeginDeferringScripts in some cases
mDocumentParsingDone = true;
}
mDeferEnabled = false;
if (aTerminated) {
mDeferRequests.Clear();
mAsyncRequests.Clear();
mNonAsyncExternalScriptInsertedRequests.Clear();
mXSLTRequests.Clear();
mParserBlockingRequest = nullptr;
}
// Have to call this even if aTerminated so we'll correctly unblock
// onload and all.
ProcessPendingRequests();
}
void
nsScriptLoader::PreloadURI(nsIURI *aURI, const nsAString &aCharset,
const nsAString &aType,
const nsAString &aCrossOrigin)
{
// Check to see if scripts has been turned off.
if (!mEnabled || !mDocument->IsScriptEnabled()) {
return;
}
nsRefPtr<nsScriptLoadRequest> request =
new nsScriptLoadRequest(nullptr, 0,
nsGenericElement::StringToCORSMode(aCrossOrigin));
request->mURI = aURI;
request->mIsInline = false;
request->mLoading = true;
nsresult rv = StartLoad(request, aType);
if (NS_FAILED(rv)) {
return;
}
PreloadInfo *pi = mPreloads.AppendElement();
pi->mRequest = request;
pi->mCharset = aCharset;
}
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