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      1 /*
      2  * Copyright (C) 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 "V8Utilities.h"
     33 
     34 #include <v8.h>
     35 
     36 #include "Document.h"
     37 #include "Frame.h"
     38 #include "ScriptExecutionContext.h"
     39 #include "ScriptState.h"
     40 #include "V8Binding.h"
     41 #include "V8Proxy.h"
     42 #include "WorkerContext.h"
     43 #include "WorkerContextExecutionProxy.h"
     44 
     45 #include <wtf/Assertions.h>
     46 #include "Frame.h"
     47 
     48 namespace WebCore {
     49 
     50 // Use an array to hold dependents. It works like a ref-counted scheme.
     51 // A value can be added more than once to the DOM object.
     52 void createHiddenDependency(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex)
     53 {
     54     v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
     55     if (cache->IsNull() || cache->IsUndefined()) {
     56         cache = v8::Array::New();
     57         object->SetInternalField(cacheIndex, cache);
     58     }
     59 
     60     v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
     61     cacheArray->Set(v8::Integer::New(cacheArray->Length()), value);
     62 }
     63 
     64 void removeHiddenDependency(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex)
     65 {
     66     v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
     67     if (!cache->IsArray())
     68         return;
     69     v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
     70     for (int i = cacheArray->Length() - 1; i >= 0; --i) {
     71         v8::Local<v8::Value> cached = cacheArray->Get(v8::Integer::New(i));
     72         if (cached->StrictEquals(value)) {
     73             cacheArray->Delete(i);
     74             return;
     75         }
     76     }
     77 }
     78 
     79 void transferHiddenDependency(v8::Handle<v8::Object> object,
     80                               EventListener* oldValue,
     81                               v8::Local<v8::Value> newValue,
     82                               int cacheIndex)
     83 {
     84     if (oldValue) {
     85         V8AbstractEventListener* oldListener = V8AbstractEventListener::cast(oldValue);
     86         if (oldListener) {
     87             v8::Local<v8::Object> oldListenerObject = oldListener->getExistingListenerObject();
     88             if (!oldListenerObject.IsEmpty())
     89                 removeHiddenDependency(object, oldListenerObject, cacheIndex);
     90         }
     91     }
     92     if (!newValue->IsNull() && !newValue->IsUndefined())
     93         createHiddenDependency(object, newValue, cacheIndex);
     94 }
     95 
     96 
     97 bool processingUserGesture()
     98 {
     99     Frame* frame = V8Proxy::retrieveFrameForEnteredContext();
    100     return frame && frame->script()->processingUserGesture();
    101 }
    102 
    103 bool shouldAllowNavigation(Frame* frame)
    104 {
    105     Frame* callingFrame = V8Proxy::retrieveFrameForCallingContext();
    106     return callingFrame && callingFrame->loader()->shouldAllowNavigation(frame);
    107 }
    108 
    109 KURL completeURL(const String& relativeURL)
    110 {
    111     // For histoical reasons, we need to complete the URL using the dynamic frame.
    112     Frame* frame = V8Proxy::retrieveFrameForEnteredContext();
    113     if (!frame)
    114         return KURL();
    115     return frame->loader()->completeURL(relativeURL);
    116 }
    117 
    118 void navigateIfAllowed(Frame* frame, const KURL& url, bool lockHistory, bool lockBackForwardList)
    119 {
    120     Frame* callingFrame = V8Proxy::retrieveFrameForCallingContext();
    121     if (!callingFrame)
    122         return;
    123 
    124     if (!protocolIsJavaScript(url) || ScriptController::isSafeScript(frame))
    125         frame->redirectScheduler()->scheduleLocationChange(url.string(), callingFrame->loader()->outgoingReferrer(), lockHistory, lockBackForwardList, processingUserGesture());
    126 }
    127 
    128 ScriptExecutionContext* getScriptExecutionContext(ScriptState* scriptState)
    129 {
    130 #if ENABLE(WORKERS)
    131     WorkerContextExecutionProxy* proxy = WorkerContextExecutionProxy::retrieve();
    132     if (proxy)
    133         return proxy->workerContext()->scriptExecutionContext();
    134 #endif
    135 
    136     Frame* frame;
    137     if (scriptState) {
    138         v8::HandleScope handleScope;
    139         frame = V8Proxy::retrieveFrame(scriptState->context());
    140     } else
    141         frame = V8Proxy::retrieveFrameForCurrentContext();
    142 
    143     if (frame)
    144         return frame->document()->scriptExecutionContext();
    145 
    146     return 0;
    147 }
    148 
    149 void reportException(ScriptState* scriptState, v8::TryCatch& exceptionCatcher)
    150 {
    151     String errorMessage;
    152     int lineNumber = 0;
    153     String sourceURL;
    154 
    155     // There can be a situation that an exception is thrown without setting a message.
    156     v8::Local<v8::Message> message = exceptionCatcher.Message();
    157     if (message.IsEmpty()) {
    158         v8::Local<v8::String> exceptionString = exceptionCatcher.Exception()->ToString();
    159         // Conversion of the exception object to string can fail if an
    160         // exception is thrown during conversion.
    161         if (!exceptionString.IsEmpty())
    162             errorMessage = toWebCoreString(exceptionString);
    163     } else {
    164         errorMessage = toWebCoreString(message->Get());
    165         lineNumber = message->GetLineNumber();
    166         sourceURL = toWebCoreString(message->GetScriptResourceName());
    167     }
    168 
    169     // Do not report the exception if the current execution context is Document because we do not want to lead to duplicate error messages in the console.
    170     // FIXME (31171): need better design to solve the duplicate error message reporting problem.
    171     ScriptExecutionContext* context = getScriptExecutionContext(scriptState);
    172     // During the frame teardown, there may not be a valid context.
    173     if (context && !context->isDocument())
    174         context->reportException(errorMessage, lineNumber, sourceURL);
    175     exceptionCatcher.Reset();
    176 }
    177 
    178 } // namespace WebCore
    179