| /* |
| * Copyright (C) 2006, 2007, 2008, 2009 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "V8LazyEventListener.h" |
| |
| #include "ContentSecurityPolicy.h" |
| #include "Frame.h" |
| #include "V8Binding.h" |
| #include "V8HiddenPropertyName.h" |
| #include "V8Proxy.h" |
| #include "WorldContextHandle.h" |
| |
| #include <wtf/StdLibExtras.h> |
| |
| namespace WebCore { |
| |
| V8LazyEventListener::V8LazyEventListener(const String& functionName, bool isSVGEvent, const String& code, const String sourceURL, const TextPosition0& position, const WorldContextHandle& worldContext) |
| : V8AbstractEventListener(true, worldContext) |
| , m_functionName(functionName) |
| , m_isSVGEvent(isSVGEvent) |
| , m_code(code) |
| , m_sourceURL(sourceURL) |
| , m_position(position) |
| { |
| } |
| |
| v8::Local<v8::Value> V8LazyEventListener::callListenerFunction(ScriptExecutionContext* context, v8::Handle<v8::Value> jsEvent, Event* event) |
| { |
| v8::Local<v8::Object> listenerObject = getListenerObject(context); |
| if (listenerObject.IsEmpty()) |
| return v8::Local<v8::Value>(); |
| |
| v8::Local<v8::Function> handlerFunction = v8::Local<v8::Function>::Cast(listenerObject); |
| v8::Local<v8::Object> receiver = getReceiverObject(event); |
| if (handlerFunction.IsEmpty() || receiver.IsEmpty()) |
| return v8::Local<v8::Value>(); |
| |
| v8::Handle<v8::Value> parameters[1] = { jsEvent }; |
| |
| if (V8Proxy* proxy = V8Proxy::retrieve(context)) |
| return proxy->callFunction(handlerFunction, receiver, 1, parameters); |
| |
| return v8::Local<v8::Value>(); |
| } |
| |
| static v8::Handle<v8::Value> V8LazyEventListenerToString(const v8::Arguments& args) |
| { |
| return args.Holder()->GetHiddenValue(V8HiddenPropertyName::toStringString()); |
| } |
| |
| void V8LazyEventListener::prepareListenerObject(ScriptExecutionContext* context) |
| { |
| if (hasExistingListenerObject()) |
| return; |
| |
| if (context->isDocument() && !static_cast<Document*>(context)->contentSecurityPolicy()->allowInlineEventHandlers()) |
| return; |
| |
| v8::HandleScope handleScope; |
| |
| V8Proxy* proxy = V8Proxy::retrieve(context); |
| if (!proxy) |
| return; |
| |
| // Use the outer scope to hold context. |
| v8::Local<v8::Context> v8Context = worldContext().adjustedContext(proxy); |
| // Bail out if we cannot get the context. |
| if (v8Context.IsEmpty()) |
| return; |
| |
| v8::Context::Scope scope(v8Context); |
| |
| // FIXME: cache the wrapper function. |
| |
| // Nodes other than the document object, when executing inline event handlers push document, form, and the target node on the scope chain. |
| // We do this by using 'with' statement. |
| // See chrome/fast/forms/form-action.html |
| // chrome/fast/forms/selected-index-value.html |
| // base/fast/overflow/onscroll-layer-self-destruct.html |
| // |
| // Don't use new lines so that lines in the modified handler |
| // have the same numbers as in the original code. |
| String code = "(function (evt) {" \ |
| "with (this.ownerDocument ? this.ownerDocument : {}) {" \ |
| "with (this.form ? this.form : {}) {" \ |
| "with (this) {" \ |
| "return (function(evt){"; |
| code.append(m_code); |
| // Insert '\n' otherwise //-style comments could break the handler. |
| code.append( "\n}).call(this, evt);}}}})"); |
| v8::Handle<v8::String> codeExternalString = v8ExternalString(code); |
| v8::Handle<v8::Script> script = V8Proxy::compileScript(codeExternalString, m_sourceURL, m_position); |
| if (!script.IsEmpty()) { |
| v8::Local<v8::Value> value = proxy->runScript(script, false); |
| if (!value.IsEmpty()) { |
| ASSERT(value->IsFunction()); |
| |
| v8::Local<v8::Function> wrappedFunction = v8::Local<v8::Function>::Cast(value); |
| |
| // Change the toString function on the wrapper function to avoid it |
| // returning the source for the actual wrapper function. Instead it |
| // returns source for a clean wrapper function with the event |
| // argument wrapping the event source code. The reason for this is |
| // that some web sites use toString on event functions and eval the |
| // source returned (sometimes a RegExp is applied as well) for some |
| // other use. That fails miserably if the actual wrapper source is |
| // returned. |
| DEFINE_STATIC_LOCAL(v8::Persistent<v8::FunctionTemplate>, toStringTemplate, ()); |
| if (toStringTemplate.IsEmpty()) |
| toStringTemplate = v8::Persistent<v8::FunctionTemplate>::New(v8::FunctionTemplate::New(V8LazyEventListenerToString)); |
| v8::Local<v8::Function> toStringFunction; |
| if (!toStringTemplate.IsEmpty()) |
| toStringFunction = toStringTemplate->GetFunction(); |
| if (!toStringFunction.IsEmpty()) { |
| String toStringResult = "function "; |
| toStringResult.append(m_functionName); |
| toStringResult.append("("); |
| toStringResult.append(m_isSVGEvent ? "evt" : "event"); |
| toStringResult.append(") {\n "); |
| toStringResult.append(m_code); |
| toStringResult.append("\n}"); |
| wrappedFunction->SetHiddenValue(V8HiddenPropertyName::toStringString(), v8ExternalString(toStringResult)); |
| wrappedFunction->Set(v8::String::New("toString"), toStringFunction); |
| } |
| |
| wrappedFunction->SetName(v8::String::New(fromWebCoreString(m_functionName), m_functionName.length())); |
| |
| setListenerObject(wrappedFunction); |
| } |
| } |
| } |
| |
| } // namespace WebCore |