1 /* 2 * Copyright (C) 2009 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "config.h" 32 #include "ScriptEventListener.h" 33 34 #include "Attribute.h" 35 #include "Document.h" 36 #include "EventListener.h" 37 #include "JSNode.h" 38 #include "Frame.h" 39 #include "XSSAuditor.h" 40 #include <runtime/JSLock.h> 41 42 using namespace JSC; 43 44 namespace WebCore { 45 46 static const String& eventParameterName(bool isSVGEvent) 47 { 48 DEFINE_STATIC_LOCAL(const String, eventString, ("event")); 49 DEFINE_STATIC_LOCAL(const String, evtString, ("evt")); 50 return isSVGEvent ? evtString : eventString; 51 } 52 53 PassRefPtr<JSLazyEventListener> createAttributeEventListener(Node* node, Attribute* attr) 54 { 55 ASSERT(node); 56 ASSERT(attr); 57 if (attr->isNull()) 58 return 0; 59 60 int lineNumber = 1; 61 String sourceURL; 62 JSObject* wrapper = 0; 63 64 // FIXME: We should be able to provide accurate source information for frameless documents, too (e.g. for importing nodes from XMLHttpRequest.responseXML). 65 if (Frame* frame = node->document()->frame()) { 66 ScriptController* scriptController = frame->script(); 67 if (!scriptController->canExecuteScripts()) 68 return 0; 69 70 if (!scriptController->xssAuditor()->canCreateInlineEventListener(attr->localName().string(), attr->value())) { 71 // This script is not safe to execute. 72 return 0; 73 } 74 75 lineNumber = scriptController->eventHandlerLineNumber(); 76 sourceURL = node->document()->url().string(); 77 78 JSC::JSLock lock(SilenceAssertionsOnly); 79 JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(node->document(), mainThreadNormalWorld()); 80 wrapper = asObject(toJS(globalObject->globalExec(), globalObject, node)); 81 } 82 83 return JSLazyEventListener::create(attr->localName().string(), eventParameterName(node->isSVGElement()), attr->value(), node, sourceURL, lineNumber, wrapper, mainThreadNormalWorld()); 84 } 85 86 PassRefPtr<JSLazyEventListener> createAttributeEventListener(Frame* frame, Attribute* attr) 87 { 88 if (!frame) 89 return 0; 90 91 ASSERT(attr); 92 if (attr->isNull()) 93 return 0; 94 95 int lineNumber = 1; 96 String sourceURL; 97 98 ScriptController* scriptController = frame->script(); 99 if (!scriptController->canExecuteScripts()) 100 return 0; 101 102 if (!scriptController->xssAuditor()->canCreateInlineEventListener(attr->localName().string(), attr->value())) { 103 // This script is not safe to execute. 104 return 0; 105 } 106 107 lineNumber = scriptController->eventHandlerLineNumber(); 108 sourceURL = frame->document()->url().string(); 109 JSObject* wrapper = toJSDOMWindow(frame, mainThreadNormalWorld()); 110 return JSLazyEventListener::create(attr->localName().string(), eventParameterName(frame->document()->isSVGDocument()), attr->value(), 0, sourceURL, lineNumber, wrapper, mainThreadNormalWorld()); 111 } 112 113 String getEventListenerHandlerBody(ScriptExecutionContext* context, ScriptState* scriptState, EventListener* eventListener) 114 { 115 const JSEventListener* jsListener = JSEventListener::cast(eventListener); 116 if (!jsListener) 117 return ""; 118 JSC::JSObject* jsFunction = jsListener->jsFunction(context); 119 if (!jsFunction) 120 return ""; 121 return jsFunction->toString(scriptState); 122 } 123 124 } // namespace WebCore 125