From cad810f21b803229eb11403f9209855525a25d57 Mon Sep 17 00:00:00 2001
From: Steve Block <steveblock@google.com>
Date: Fri, 6 May 2011 11:45:16 +0100
Subject: Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
---
 Source/WebCore/bindings/js/ScriptController.cpp | 520 ++++++++++++++++++++++++
 1 file changed, 520 insertions(+)
 create mode 100644 Source/WebCore/bindings/js/ScriptController.cpp

(limited to 'Source/WebCore/bindings/js/ScriptController.cpp')

diff --git a/Source/WebCore/bindings/js/ScriptController.cpp b/Source/WebCore/bindings/js/ScriptController.cpp
new file mode 100644
index 0000000..cf55080
--- /dev/null
+++ b/Source/WebCore/bindings/js/ScriptController.cpp
@@ -0,0 +1,520 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
+ *  Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+#include "ScriptController.h"
+
+#include "ScriptableDocumentParser.h"
+#include "Event.h"
+#include "EventNames.h"
+#include "Frame.h"
+#include "FrameLoaderClient.h"
+#include "GCController.h"
+#include "HTMLPlugInElement.h"
+#include "InspectorInstrumentation.h"
+#include "JSDocument.h"
+#include "JSMainThreadExecState.h"
+#include "NP_jsobject.h"
+#include "Page.h"
+#include "PageGroup.h"
+#include "ScriptSourceCode.h"
+#include "ScriptValue.h"
+#include "Settings.h"
+#include "StorageNamespace.h"
+#include "UserGestureIndicator.h"
+#include "WebCoreJSClientData.h"
+#include "XSSAuditor.h"
+#include "npruntime_impl.h"
+#include "runtime_root.h"
+#include <debugger/Debugger.h>
+#include <runtime/InitializeThreading.h>
+#include <runtime/JSLock.h>
+#include <wtf/Threading.h>
+
+using namespace JSC;
+using namespace std;
+
+namespace WebCore {
+
+void ScriptController::initializeThreading()
+{
+    JSC::initializeThreading();
+    WTF::initializeMainThread();
+}
+
+ScriptController::ScriptController(Frame* frame)
+    : m_frame(frame)
+    , m_sourceURL(0)
+    , m_inExecuteScript(false)
+    , m_processingTimerCallback(false)
+    , m_paused(false)
+    , m_allowPopupsFromPlugin(false)
+#if ENABLE(NETSCAPE_PLUGIN_API)
+    , m_windowScriptNPObject(0)
+#endif
+#if PLATFORM(MAC)
+    , m_windowScriptObject(0)
+#endif
+    , m_XSSAuditor(new XSSAuditor(frame))
+{
+#if PLATFORM(MAC) && ENABLE(JAVA_BRIDGE)
+    static bool initializedJavaJSBindings;
+    if (!initializedJavaJSBindings) {
+        initializedJavaJSBindings = true;
+        initJavaJSBindings();
+    }
+#endif
+}
+
+ScriptController::~ScriptController()
+{
+    disconnectPlatformScriptObjects();
+
+    if (m_cacheableBindingRootObject) {
+        m_cacheableBindingRootObject->invalidate();
+        m_cacheableBindingRootObject = 0;
+    }
+
+    // It's likely that destroying m_windowShells will create a lot of garbage.
+    if (!m_windowShells.isEmpty()) {
+        while (!m_windowShells.isEmpty())
+            destroyWindowShell(m_windowShells.begin()->first.get());
+        gcController().garbageCollectSoon();
+    }
+}
+
+void ScriptController::destroyWindowShell(DOMWrapperWorld* world)
+{
+    ASSERT(m_windowShells.contains(world));
+    m_windowShells.remove(world);
+    world->didDestroyWindowShell(this);
+}
+
+JSDOMWindowShell* ScriptController::createWindowShell(DOMWrapperWorld* world)
+{
+    ASSERT(!m_windowShells.contains(world));
+    JSDOMWindowShell* windowShell = new JSDOMWindowShell(m_frame->domWindow(), world);
+    m_windowShells.add(world, windowShell);
+    world->didCreateWindowShell(this);
+    return windowShell;
+}
+
+ScriptValue ScriptController::evaluateInWorld(const ScriptSourceCode& sourceCode, DOMWrapperWorld* world, ShouldAllowXSS shouldAllowXSS)
+{
+    const SourceCode& jsSourceCode = sourceCode.jsSourceCode();
+    String sourceURL = ustringToString(jsSourceCode.provider()->url());
+
+    if (shouldAllowXSS == DoNotAllowXSS && !m_XSSAuditor->canEvaluate(sourceCode.source())) {
+        // This script is not safe to be evaluated.
+        return JSValue();
+    }
+
+    // evaluate code. Returns the JS return value or 0
+    // if there was none, an error occurred or the type couldn't be converted.
+
+    // inlineCode is true for <a href="javascript:doSomething()">
+    // and false for <script>doSomething()</script>. Check if it has the
+    // expected value in all cases.
+    // See smart window.open policy for where this is used.
+    JSDOMWindowShell* shell = windowShell(world);
+    ExecState* exec = shell->window()->globalExec();
+    const String* savedSourceURL = m_sourceURL;
+    m_sourceURL = &sourceURL;
+
+    JSLock lock(SilenceAssertionsOnly);
+
+    RefPtr<Frame> protect = m_frame;
+
+    InspectorInstrumentationCookie cookie = InspectorInstrumentation::willEvaluateScript(m_frame, sourceURL, sourceCode.startLine());
+
+    exec->globalData().timeoutChecker.start();
+    Completion comp = JSMainThreadExecState::evaluate(exec, exec->dynamicGlobalObject()->globalScopeChain(), jsSourceCode, shell);
+    exec->globalData().timeoutChecker.stop();
+
+    InspectorInstrumentation::didEvaluateScript(cookie);
+
+    // Evaluating the JavaScript could cause the frame to be deallocated
+    // so we start the keep alive timer here.
+    m_frame->keepAlive();
+
+    if (comp.complType() == Normal || comp.complType() == ReturnValue) {
+        m_sourceURL = savedSourceURL;
+        return comp.value();
+    }
+
+    if (comp.complType() == Throw || comp.complType() == Interrupted)
+        reportException(exec, comp.value());
+
+    m_sourceURL = savedSourceURL;
+    return JSValue();
+}
+
+ScriptValue ScriptController::evaluate(const ScriptSourceCode& sourceCode, ShouldAllowXSS shouldAllowXSS) 
+{
+    return evaluateInWorld(sourceCode, mainThreadNormalWorld(), shouldAllowXSS);
+}
+
+PassRefPtr<DOMWrapperWorld> ScriptController::createWorld()
+{
+    return DOMWrapperWorld::create(JSDOMWindow::commonJSGlobalData());
+}
+
+void ScriptController::getAllWorlds(Vector<DOMWrapperWorld*>& worlds)
+{
+    static_cast<WebCoreJSClientData*>(JSDOMWindow::commonJSGlobalData()->clientData)->getAllWorlds(worlds);
+}
+
+void ScriptController::clearWindowShell(bool goingIntoPageCache)
+{
+    if (m_windowShells.isEmpty())
+        return;
+
+    JSLock lock(SilenceAssertionsOnly);
+
+    for (ShellMap::iterator iter = m_windowShells.begin(); iter != m_windowShells.end(); ++iter) {
+        JSDOMWindowShell* windowShell = iter->second;
+
+        // Clear the debugger from the current window before setting the new window.
+        attachDebugger(windowShell, 0);
+
+        windowShell->window()->willRemoveFromWindowShell();
+        windowShell->setWindow(m_frame->domWindow());
+
+        // An m_cacheableBindingRootObject persists between page navigations
+        // so needs to know about the new JSDOMWindow.
+        if (m_cacheableBindingRootObject)
+            m_cacheableBindingRootObject->updateGlobalObject(windowShell->window());
+
+        if (Page* page = m_frame->page()) {
+            attachDebugger(windowShell, page->debugger());
+            windowShell->window()->setProfileGroup(page->group().identifier());
+        }
+    }
+
+    // It's likely that resetting our windows created a lot of garbage, unless
+    // it went in a back/forward cache.
+    if (!goingIntoPageCache)
+        gcController().garbageCollectSoon();
+}
+
+JSDOMWindowShell* ScriptController::initScript(DOMWrapperWorld* world)
+{
+    ASSERT(!m_windowShells.contains(world));
+
+    JSLock lock(SilenceAssertionsOnly);
+
+    JSDOMWindowShell* windowShell = createWindowShell(world);
+
+    windowShell->window()->updateDocument();
+
+    if (Page* page = m_frame->page()) {
+        attachDebugger(windowShell, page->debugger());
+        windowShell->window()->setProfileGroup(page->group().identifier());
+    }
+
+    m_frame->loader()->dispatchDidClearWindowObjectInWorld(world);
+
+    return windowShell;
+}
+
+int ScriptController::eventHandlerLineNumber() const
+{
+    // JSC expects 1-based line numbers, so we must add one here to get it right.
+    ScriptableDocumentParser* parser = m_frame->document()->scriptableDocumentParser();
+    if (parser)
+        return parser->lineNumber() + 1;
+    return 0;
+}
+
+bool ScriptController::processingUserGesture()
+{
+    ExecState* exec = JSMainThreadExecState::currentState();
+    Frame* frame = exec ? toDynamicFrame(exec) : 0;
+    // No script is running, so it is user-initiated unless the gesture stack
+    // explicitly says it is not.
+    if (!frame)
+        return UserGestureIndicator::getUserGestureState() != DefinitelyNotProcessingUserGesture;
+
+    // FIXME: We check the plugin popup flag and javascript anchor navigation
+    // from the dynamic frame becuase they should only be initiated on the
+    // dynamic frame in which execution began if they do happen.
+    ScriptController* scriptController = frame->script();
+    ASSERT(scriptController);
+    if (scriptController->allowPopupsFromPlugin() || scriptController->isJavaScriptAnchorNavigation())
+        return true;
+
+    // If a DOM event is being processed, check that it was initiated by the user
+    // and that it is in the whitelist of event types allowed to generate pop-ups.
+    if (JSDOMWindowShell* shell = scriptController->existingWindowShell(currentWorld(exec)))
+        if (Event* event = shell->window()->currentEvent())
+            return event->fromUserGesture();
+
+    return UserGestureIndicator::processingUserGesture();
+}
+
+// FIXME: This seems like an insufficient check to verify a click on a javascript: anchor.
+bool ScriptController::isJavaScriptAnchorNavigation() const
+{
+    // This is the <a href="javascript:window.open('...')> case -> we let it through
+    if (m_sourceURL && m_sourceURL->isNull() && !m_processingTimerCallback)
+        return true;
+
+    // This is the <script>window.open(...)</script> case or a timer callback -> block it
+    return false;
+}
+
+bool ScriptController::anyPageIsProcessingUserGesture() const
+{
+    Page* page = m_frame->page();
+    if (!page)
+        return false;
+
+    const HashSet<Page*>& pages = page->group().pages();
+    HashSet<Page*>::const_iterator end = pages.end();
+    for (HashSet<Page*>::const_iterator it = pages.begin(); it != end; ++it) {
+        for (Frame* frame = page->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
+            ScriptController* script = frame->script();
+
+            if (script->m_allowPopupsFromPlugin)
+                return true;
+
+            const ShellMap::const_iterator iterEnd = m_windowShells.end();
+            for (ShellMap::const_iterator iter = m_windowShells.begin(); iter != iterEnd; ++iter) {
+                JSDOMWindowShell* shell = iter->second.get();
+                Event* event = shell->window()->currentEvent();
+                if (event && event->fromUserGesture())
+                    return true;
+            }
+
+            if (isJavaScriptAnchorNavigation())
+                return true;
+        }
+    }
+
+    return false;
+}
+
+bool ScriptController::canAccessFromCurrentOrigin(Frame *frame)
+{
+    ExecState* exec = JSMainThreadExecState::currentState();
+    if (exec)
+        return allowsAccessFromFrame(exec, frame);
+    // If the current state is 0 we're in a call path where the DOM security 
+    // check doesn't apply (eg. parser).
+    return true;
+}
+
+void ScriptController::attachDebugger(JSC::Debugger* debugger)
+{
+    for (ShellMap::iterator iter = m_windowShells.begin(); iter != m_windowShells.end(); ++iter)
+        attachDebugger(iter->second, debugger);
+}
+
+void ScriptController::attachDebugger(JSDOMWindowShell* shell, JSC::Debugger* debugger)
+{
+    if (!shell)
+        return;
+
+    JSDOMWindow* globalObject = shell->window();
+    if (debugger)
+        debugger->attach(globalObject);
+    else if (JSC::Debugger* currentDebugger = globalObject->debugger())
+        currentDebugger->detach(globalObject);
+}
+
+void ScriptController::updateDocument()
+{
+    if (!m_frame->document())
+        return;
+
+    JSLock lock(SilenceAssertionsOnly);
+    for (ShellMap::iterator iter = m_windowShells.begin(); iter != m_windowShells.end(); ++iter)
+        iter->second->window()->updateDocument();
+}
+
+void ScriptController::updateSecurityOrigin()
+{
+    // Our bindings do not do anything in this case.
+}
+
+Bindings::RootObject* ScriptController::cacheableBindingRootObject()
+{
+    if (!canExecuteScripts(NotAboutToExecuteScript))
+        return 0;
+
+    if (!m_cacheableBindingRootObject) {
+        JSLock lock(SilenceAssertionsOnly);
+        m_cacheableBindingRootObject = Bindings::RootObject::create(0, globalObject(pluginWorld()));
+    }
+    return m_cacheableBindingRootObject.get();
+}
+
+Bindings::RootObject* ScriptController::bindingRootObject()
+{
+    if (!canExecuteScripts(NotAboutToExecuteScript))
+        return 0;
+
+    if (!m_bindingRootObject) {
+        JSLock lock(SilenceAssertionsOnly);
+        m_bindingRootObject = Bindings::RootObject::create(0, globalObject(pluginWorld()));
+    }
+    return m_bindingRootObject.get();
+}
+
+PassRefPtr<Bindings::RootObject> ScriptController::createRootObject(void* nativeHandle)
+{
+    RootObjectMap::iterator it = m_rootObjects.find(nativeHandle);
+    if (it != m_rootObjects.end())
+        return it->second;
+
+    RefPtr<Bindings::RootObject> rootObject = Bindings::RootObject::create(nativeHandle, globalObject(pluginWorld()));
+
+    m_rootObjects.set(nativeHandle, rootObject);
+    return rootObject.release();
+}
+
+#if ENABLE(INSPECTOR)
+void ScriptController::setCaptureCallStackForUncaughtExceptions(bool)
+{
+}
+#endif
+
+#if ENABLE(NETSCAPE_PLUGIN_API)
+
+NPObject* ScriptController::windowScriptNPObject()
+{
+    if (!m_windowScriptNPObject) {
+        if (canExecuteScripts(NotAboutToExecuteScript)) {
+            // JavaScript is enabled, so there is a JavaScript window object.
+            // Return an NPObject bound to the window object.
+            JSC::JSLock lock(SilenceAssertionsOnly);
+            JSObject* win = windowShell(pluginWorld())->window();
+            ASSERT(win);
+            Bindings::RootObject* root = bindingRootObject();
+            m_windowScriptNPObject = _NPN_CreateScriptObject(0, win, root);
+        } else {
+            // JavaScript is not enabled, so we cannot bind the NPObject to the JavaScript window object.
+            // Instead, we create an NPObject of a different class, one which is not bound to a JavaScript object.
+            m_windowScriptNPObject = _NPN_CreateNoScriptObject();
+        }
+    }
+
+    return m_windowScriptNPObject;
+}
+
+NPObject* ScriptController::createScriptObjectForPluginElement(HTMLPlugInElement* plugin)
+{
+    JSObject* object = jsObjectForPluginElement(plugin);
+    if (!object)
+        return _NPN_CreateNoScriptObject();
+
+    // Wrap the JSObject in an NPObject
+    return _NPN_CreateScriptObject(0, object, bindingRootObject());
+}
+
+#endif
+
+JSObject* ScriptController::jsObjectForPluginElement(HTMLPlugInElement* plugin)
+{
+    // Can't create JSObjects when JavaScript is disabled
+    if (!canExecuteScripts(NotAboutToExecuteScript))
+        return 0;
+
+    // Create a JSObject bound to this element
+    JSLock lock(SilenceAssertionsOnly);
+    JSDOMWindow* globalObj = globalObject(pluginWorld());
+    // FIXME: is normal okay? - used for NP plugins?
+    JSValue jsElementValue = toJS(globalObj->globalExec(), globalObj, plugin);
+    if (!jsElementValue || !jsElementValue.isObject())
+        return 0;
+    
+    return jsElementValue.getObject();
+}
+
+#if !PLATFORM(MAC)
+
+void ScriptController::updatePlatformScriptObjects()
+{
+}
+
+void ScriptController::disconnectPlatformScriptObjects()
+{
+}
+
+#endif
+
+void ScriptController::cleanupScriptObjectsForPlugin(void* nativeHandle)
+{
+    RootObjectMap::iterator it = m_rootObjects.find(nativeHandle);
+
+    if (it == m_rootObjects.end())
+        return;
+
+    it->second->invalidate();
+    m_rootObjects.remove(it);
+}
+
+void ScriptController::clearScriptObjects()
+{
+    JSLock lock(SilenceAssertionsOnly);
+
+    RootObjectMap::const_iterator end = m_rootObjects.end();
+    for (RootObjectMap::const_iterator it = m_rootObjects.begin(); it != end; ++it)
+        it->second->invalidate();
+
+    m_rootObjects.clear();
+
+    if (m_bindingRootObject) {
+        m_bindingRootObject->invalidate();
+        m_bindingRootObject = 0;
+    }
+
+#if ENABLE(NETSCAPE_PLUGIN_API)
+    if (m_windowScriptNPObject) {
+        // Call _NPN_DeallocateObject() instead of _NPN_ReleaseObject() so that we don't leak if a plugin fails to release the window
+        // script object properly.
+        // This shouldn't cause any problems for plugins since they should have already been stopped and destroyed at this point.
+        _NPN_DeallocateObject(m_windowScriptNPObject);
+        m_windowScriptNPObject = 0;
+    }
+#endif
+}
+
+ScriptValue ScriptController::executeScriptInWorld(DOMWrapperWorld* world, const String& script, bool forceUserGesture, ShouldAllowXSS shouldAllowXSS)
+{
+    ScriptSourceCode sourceCode(script, forceUserGesture ? KURL() : m_frame->document()->url());
+
+    if (!canExecuteScripts(AboutToExecuteScript) || isPaused())
+        return ScriptValue();
+
+    bool wasInExecuteScript = m_inExecuteScript;
+    m_inExecuteScript = true;
+
+    ScriptValue result = evaluateInWorld(sourceCode, world, shouldAllowXSS);
+
+    if (!wasInExecuteScript) {
+        m_inExecuteScript = false;
+        Document::updateStyleForAllDocuments();
+    }
+
+    return result;
+}
+
+} // namespace WebCore
-- 
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