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      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 "bindings/v8/ScriptEventListener.h"
     33 
     34 #include "bindings/v8/ScriptController.h"
     35 #include "bindings/v8/ScriptState.h"
     36 #include "bindings/v8/V8AbstractEventListener.h"
     37 #include "bindings/v8/V8Binding.h"
     38 #include "bindings/v8/V8WindowShell.h"
     39 #include "core/dom/Document.h"
     40 #include "core/dom/DocumentParser.h"
     41 #include "core/events/EventListener.h"
     42 #include "core/frame/LocalFrame.h"
     43 #include <v8.h>
     44 
     45 namespace WebCore {
     46 
     47 PassRefPtr<V8LazyEventListener> createAttributeEventListener(Node* node, const QualifiedName& name, const AtomicString& value, const AtomicString& eventParameterName)
     48 {
     49     ASSERT(node);
     50     if (value.isNull())
     51         return nullptr;
     52 
     53     // FIXME: Very strange: we initialize zero-based number with '1'.
     54     TextPosition position(OrdinalNumber::fromZeroBasedInt(1), OrdinalNumber::first());
     55     String sourceURL;
     56 
     57     v8::Isolate* isolate;
     58     if (LocalFrame* frame = node->document().frame()) {
     59         isolate = toIsolate(frame);
     60         ScriptController& scriptController = frame->script();
     61         if (!scriptController.canExecuteScripts(AboutToExecuteScript))
     62             return nullptr;
     63         position = scriptController.eventHandlerPosition();
     64         sourceURL = node->document().url().string();
     65     } else {
     66         isolate = v8::Isolate::GetCurrent();
     67     }
     68 
     69     return V8LazyEventListener::create(name.localName(), eventParameterName, value, sourceURL, position, node, isolate);
     70 }
     71 
     72 PassRefPtr<V8LazyEventListener> createAttributeEventListener(LocalFrame* frame, const QualifiedName& name, const AtomicString& value, const AtomicString& eventParameterName)
     73 {
     74     if (!frame)
     75         return nullptr;
     76 
     77     if (value.isNull())
     78         return nullptr;
     79 
     80     ScriptController& scriptController = frame->script();
     81     if (!scriptController.canExecuteScripts(AboutToExecuteScript))
     82         return nullptr;
     83 
     84     TextPosition position = scriptController.eventHandlerPosition();
     85     String sourceURL = frame->document()->url().string();
     86 
     87     return V8LazyEventListener::create(name.localName(), eventParameterName, value, sourceURL, position, 0, toIsolate(frame));
     88 }
     89 
     90 static v8::Handle<v8::Function> eventListenerEffectiveFunction(v8::Isolate* isolate, v8::Handle<v8::Object> listenerObject)
     91 {
     92     v8::Handle<v8::Function> function;
     93     if (listenerObject->IsFunction()) {
     94         function = v8::Handle<v8::Function>::Cast(listenerObject);
     95     } else if (listenerObject->IsObject()) {
     96         // Try the "handleEvent" method (EventListener interface).
     97         v8::Handle<v8::Value> property = listenerObject->Get(v8AtomicString(isolate, "handleEvent"));
     98         if (property.IsEmpty() || !property->IsFunction()) {
     99             // Fall back to the "constructor" property.
    100             property = listenerObject->Get(v8AtomicString(isolate, "constructor"));
    101         }
    102         if (!property.IsEmpty() && property->IsFunction())
    103             function = v8::Handle<v8::Function>::Cast(property);
    104     }
    105     return function;
    106 }
    107 
    108 String eventListenerHandlerBody(Document* document, EventListener* listener)
    109 {
    110     if (listener->type() != EventListener::JSEventListenerType)
    111         return "";
    112 
    113     v8::HandleScope scope(toIsolate(document));
    114     V8AbstractEventListener* v8Listener = static_cast<V8AbstractEventListener*>(listener);
    115     v8::Handle<v8::Context> context = toV8Context(document, v8Listener->world());
    116     v8::Context::Scope contextScope(context);
    117     v8::Handle<v8::Object> object = v8Listener->getListenerObject(document);
    118     if (object.IsEmpty())
    119         return "";
    120     v8::Handle<v8::Function> function = eventListenerEffectiveFunction(scope.GetIsolate(), object);
    121     if (function.IsEmpty())
    122         return "";
    123 
    124     TOSTRING_DEFAULT(V8StringResource<WithNullCheck>, functionString, function, "");
    125     return functionString;
    126 }
    127 
    128 ScriptValue eventListenerHandler(Document* document, EventListener* listener)
    129 {
    130     if (listener->type() != EventListener::JSEventListenerType)
    131         return ScriptValue();
    132 
    133     v8::Isolate* isolate = toIsolate(document);
    134     v8::HandleScope scope(isolate);
    135     V8AbstractEventListener* v8Listener = static_cast<V8AbstractEventListener*>(listener);
    136     v8::Handle<v8::Context> context = toV8Context(document, v8Listener->world());
    137     v8::Context::Scope contextScope(context);
    138     v8::Handle<v8::Object> function = v8Listener->getListenerObject(document);
    139     if (function.IsEmpty())
    140         return ScriptValue();
    141     return ScriptValue(ScriptState::from(context), function);
    142 }
    143 
    144 ScriptState* eventListenerHandlerScriptState(LocalFrame* frame, EventListener* listener)
    145 {
    146     if (listener->type() != EventListener::JSEventListenerType)
    147         return 0;
    148     V8AbstractEventListener* v8Listener = static_cast<V8AbstractEventListener*>(listener);
    149     v8::HandleScope scope(toIsolate(frame));
    150     v8::Handle<v8::Context> v8Context = frame->script().windowShell(v8Listener->world())->context();
    151     return ScriptState::from(v8Context);
    152 }
    153 
    154 bool eventListenerHandlerLocation(Document* document, EventListener* listener, String& sourceName, String& scriptId, int& lineNumber)
    155 {
    156     if (listener->type() != EventListener::JSEventListenerType)
    157         return false;
    158 
    159     v8::HandleScope scope(toIsolate(document));
    160     V8AbstractEventListener* v8Listener = static_cast<V8AbstractEventListener*>(listener);
    161     v8::Handle<v8::Context> context = toV8Context(document, v8Listener->world());
    162     v8::Context::Scope contextScope(context);
    163     v8::Local<v8::Object> object = v8Listener->getListenerObject(document);
    164     if (object.IsEmpty())
    165         return false;
    166     v8::Handle<v8::Function> function = eventListenerEffectiveFunction(scope.GetIsolate(), object);
    167     if (function.IsEmpty())
    168         return false;
    169     v8::Handle<v8::Function> originalFunction = getBoundFunction(function);
    170     int scriptIdValue = originalFunction->ScriptId();
    171     scriptId = String::number(scriptIdValue);
    172     v8::ScriptOrigin origin = originalFunction->GetScriptOrigin();
    173     if (!origin.ResourceName().IsEmpty() && origin.ResourceName()->IsString())
    174         sourceName = toCoreString(origin.ResourceName().As<v8::String>());
    175     else
    176         sourceName = "";
    177     lineNumber = originalFunction->GetScriptLineNumber();
    178     return true;
    179 }
    180 
    181 } // namespace WebCore
    182