1 /* 2 * Copyright (C) 2006, 2007, 2008, 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 "bindings/v8/V8LazyEventListener.h" 33 34 #include "bindings/core/v8/V8Document.h" 35 #include "bindings/core/v8/V8HTMLFormElement.h" 36 #include "bindings/core/v8/V8Node.h" 37 #include "bindings/v8/ScriptController.h" 38 #include "bindings/v8/ScriptSourceCode.h" 39 #include "bindings/v8/V8Binding.h" 40 #include "bindings/v8/V8DOMWrapper.h" 41 #include "bindings/v8/V8HiddenValue.h" 42 #include "bindings/v8/V8ScriptRunner.h" 43 #include "core/dom/Document.h" 44 #include "core/dom/Node.h" 45 #include "core/html/HTMLElement.h" 46 #include "core/html/HTMLFormElement.h" 47 #include "core/inspector/InspectorInstrumentation.h" 48 #include "core/frame/LocalFrame.h" 49 #include "core/frame/csp/ContentSecurityPolicy.h" 50 51 #include "wtf/StdLibExtras.h" 52 53 namespace WebCore { 54 55 V8LazyEventListener::V8LazyEventListener(const AtomicString& functionName, const AtomicString& eventParameterName, const String& code, const String sourceURL, const TextPosition& position, Node* node, v8::Isolate* isolate) 56 : V8AbstractEventListener(true, isolate) 57 , m_functionName(functionName) 58 , m_eventParameterName(eventParameterName) 59 , m_code(code) 60 , m_sourceURL(sourceURL) 61 , m_node(node) 62 , m_position(position) 63 { 64 } 65 66 template<typename T> 67 v8::Handle<v8::Object> toObjectWrapper(T* domObject, ScriptState* scriptState) 68 { 69 if (!domObject) 70 return v8::Object::New(scriptState->isolate()); 71 v8::Handle<v8::Value> value = toV8(domObject, scriptState->context()->Global(), scriptState->isolate()); 72 if (value.IsEmpty()) 73 return v8::Object::New(scriptState->isolate()); 74 return v8::Local<v8::Object>::New(scriptState->isolate(), value.As<v8::Object>()); 75 } 76 77 v8::Local<v8::Value> V8LazyEventListener::callListenerFunction(v8::Handle<v8::Value> jsEvent, Event* event) 78 { 79 v8::Local<v8::Object> listenerObject = getListenerObject(scriptState()->executionContext()); 80 if (listenerObject.IsEmpty()) 81 return v8::Local<v8::Value>(); 82 83 v8::Local<v8::Function> handlerFunction = listenerObject.As<v8::Function>(); 84 v8::Local<v8::Object> receiver = getReceiverObject(event); 85 if (handlerFunction.IsEmpty() || receiver.IsEmpty()) 86 return v8::Local<v8::Value>(); 87 88 if (!scriptState()->executionContext()->isDocument()) 89 return v8::Local<v8::Value>(); 90 91 LocalFrame* frame = toDocument(scriptState()->executionContext())->frame(); 92 if (!frame) 93 return v8::Local<v8::Value>(); 94 95 if (!frame->script().canExecuteScripts(AboutToExecuteScript)) 96 return v8::Local<v8::Value>(); 97 98 v8::Handle<v8::Value> parameters[1] = { jsEvent }; 99 return frame->script().callFunction(handlerFunction, receiver, WTF_ARRAY_LENGTH(parameters), parameters); 100 } 101 102 static void V8LazyEventListenerToString(const v8::FunctionCallbackInfo<v8::Value>& info) 103 { 104 v8SetReturnValue(info, V8HiddenValue::getHiddenValue(info.GetIsolate(), info.Holder(), V8HiddenValue::toStringString(info.GetIsolate()))); 105 } 106 107 void V8LazyEventListener::handleEvent(ExecutionContext* context, Event* event) 108 { 109 v8::HandleScope handleScope(toIsolate(context)); 110 // V8LazyEventListener doesn't know the associated context when created. 111 // Thus we lazily get the associated context and set a ScriptState on V8AbstractEventListener. 112 v8::Local<v8::Context> v8Context = toV8Context(context, world()); 113 if (v8Context.IsEmpty()) 114 return; 115 setScriptState(ScriptState::from(v8Context)); 116 117 V8AbstractEventListener::handleEvent(context, event); 118 } 119 120 void V8LazyEventListener::prepareListenerObject(ExecutionContext* context) 121 { 122 v8::HandleScope handleScope(toIsolate(context)); 123 // V8LazyEventListener doesn't know the associated context when created. 124 // Thus we lazily get the associated context and set a ScriptState on V8AbstractEventListener. 125 v8::Local<v8::Context> v8Context = toV8Context(context, world()); 126 if (v8Context.IsEmpty()) 127 return; 128 setScriptState(ScriptState::from(v8Context)); 129 130 if (context->isDocument() && !toDocument(context)->allowInlineEventHandlers(m_node, this, m_sourceURL, m_position.m_line)) { 131 clearListenerObject(); 132 return; 133 } 134 135 if (hasExistingListenerObject()) 136 return; 137 138 ASSERT(context->isDocument()); 139 140 ScriptState::Scope scope(scriptState()); 141 String listenerSource = InspectorInstrumentation::preprocessEventListener(toDocument(context)->frame(), m_code, m_sourceURL, m_functionName); 142 143 // FIXME: Remove the following 'with' hack. 144 // 145 // Nodes other than the document object, when executing inline event 146 // handlers push document, form owner, and the target node on the scope chain. 147 // We do this by using 'with' statement. 148 // See chrome/fast/forms/form-action.html 149 // chrome/fast/forms/selected-index-value.html 150 // base/fast/overflow/onscroll-layer-self-destruct.html 151 // 152 // Don't use new lines so that lines in the modified handler 153 // have the same numbers as in the original code. 154 // FIXME: V8 does not allow us to programmatically create object environments so 155 // we have to do this hack! What if m_code escapes to run arbitrary script? 156 // 157 // Call with 4 arguments instead of 3, pass additional null as the last parameter. 158 // By calling the function with 4 arguments, we create a setter on arguments object 159 // which would shadow property "3" on the prototype. 160 String code = "(function() {" 161 "with (this[2]) {" 162 "with (this[1]) {" 163 "with (this[0]) {" 164 "return function(" + m_eventParameterName + ") {" + 165 listenerSource + "\n" // Insert '\n' otherwise //-style comments could break the handler. 166 "};" 167 "}}}})"; 168 169 v8::Handle<v8::String> codeExternalString = v8String(isolate(), code); 170 171 v8::Local<v8::Value> result = V8ScriptRunner::compileAndRunInternalScript(codeExternalString, isolate(), m_sourceURL, m_position); 172 if (result.IsEmpty()) 173 return; 174 175 // Call the outer function to get the inner function. 176 ASSERT(result->IsFunction()); 177 v8::Local<v8::Function> intermediateFunction = result.As<v8::Function>(); 178 179 HTMLFormElement* formElement = 0; 180 if (m_node && m_node->isHTMLElement()) 181 formElement = toHTMLElement(m_node)->formOwner(); 182 183 v8::Handle<v8::Object> nodeWrapper = toObjectWrapper<Node>(m_node, scriptState()); 184 v8::Handle<v8::Object> formWrapper = toObjectWrapper<HTMLFormElement>(formElement, scriptState()); 185 v8::Handle<v8::Object> documentWrapper = toObjectWrapper<Document>(m_node ? m_node->ownerDocument() : 0, scriptState()); 186 187 v8::Local<v8::Object> thisObject = v8::Object::New(isolate()); 188 if (thisObject.IsEmpty()) 189 return; 190 if (!thisObject->ForceSet(v8::Integer::New(isolate(), 0), nodeWrapper)) 191 return; 192 if (!thisObject->ForceSet(v8::Integer::New(isolate(), 1), formWrapper)) 193 return; 194 if (!thisObject->ForceSet(v8::Integer::New(isolate(), 2), documentWrapper)) 195 return; 196 197 // FIXME: Remove this code when we stop doing the 'with' hack above. 198 v8::Local<v8::Value> innerValue = V8ScriptRunner::callInternalFunction(intermediateFunction, thisObject, 0, 0, isolate()); 199 if (innerValue.IsEmpty() || !innerValue->IsFunction()) 200 return; 201 202 v8::Local<v8::Function> wrappedFunction = innerValue.As<v8::Function>(); 203 204 // Change the toString function on the wrapper function to avoid it 205 // returning the source for the actual wrapper function. Instead it 206 // returns source for a clean wrapper function with the event 207 // argument wrapping the event source code. The reason for this is 208 // that some web sites use toString on event functions and eval the 209 // source returned (sometimes a RegExp is applied as well) for some 210 // other use. That fails miserably if the actual wrapper source is 211 // returned. 212 v8::Local<v8::Function> toStringFunction = v8::Function::New(isolate(), V8LazyEventListenerToString); 213 ASSERT(!toStringFunction.IsEmpty()); 214 String toStringString = "function " + m_functionName + "(" + m_eventParameterName + ") {\n " + m_code + "\n}"; 215 V8HiddenValue::setHiddenValue(isolate(), wrappedFunction, V8HiddenValue::toStringString(isolate()), v8String(isolate(), toStringString)); 216 wrappedFunction->Set(v8AtomicString(isolate(), "toString"), toStringFunction); 217 wrappedFunction->SetName(v8String(isolate(), m_functionName)); 218 219 // FIXME: Remove the following comment-outs. 220 // See https://bugs.webkit.org/show_bug.cgi?id=85152 for more details. 221 // 222 // For the time being, we comment out the following code since the 223 // second parsing can happen. 224 // // Since we only parse once, there's no need to keep data used for parsing around anymore. 225 // m_functionName = String(); 226 // m_code = String(); 227 // m_eventParameterName = String(); 228 // m_sourceURL = String(); 229 230 setListenerObject(wrappedFunction); 231 } 232 233 } // namespace WebCore 234