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      1 /*
      2  * Copyright (C) 2007 Apple 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/frame/History.h"
     28 
     29 #include "bindings/core/v8/ExceptionState.h"
     30 #include "core/dom/Document.h"
     31 #include "core/dom/ExceptionCode.h"
     32 #include "core/frame/LocalFrame.h"
     33 #include "core/loader/DocumentLoader.h"
     34 #include "core/loader/FrameLoader.h"
     35 #include "core/loader/FrameLoaderClient.h"
     36 #include "core/loader/HistoryItem.h"
     37 #include "core/page/BackForwardClient.h"
     38 #include "core/page/Page.h"
     39 #include "platform/weborigin/KURL.h"
     40 #include "platform/weborigin/SecurityOrigin.h"
     41 #include "wtf/MainThread.h"
     42 
     43 namespace blink {
     44 
     45 History::History(LocalFrame* frame)
     46     : DOMWindowProperty(frame)
     47     , m_lastStateObjectRequested(nullptr)
     48 {
     49 }
     50 
     51 void History::trace(Visitor* visitor)
     52 {
     53     DOMWindowProperty::trace(visitor);
     54 }
     55 
     56 unsigned History::length() const
     57 {
     58     if (!m_frame)
     59         return 0;
     60     if (!m_frame->page())
     61         return 0;
     62     return m_frame->page()->backForward().backForwardListCount();
     63 }
     64 
     65 SerializedScriptValue* History::state()
     66 {
     67     m_lastStateObjectRequested = stateInternal();
     68     return m_lastStateObjectRequested.get();
     69 }
     70 
     71 SerializedScriptValue* History::stateInternal() const
     72 {
     73     if (!m_frame)
     74         return 0;
     75 
     76     if (HistoryItem* historyItem = m_frame->loader().currentItem())
     77         return historyItem->stateObject();
     78 
     79     return 0;
     80 }
     81 
     82 bool History::stateChanged() const
     83 {
     84     return m_lastStateObjectRequested != stateInternal();
     85 }
     86 
     87 bool History::isSameAsCurrentState(SerializedScriptValue* state) const
     88 {
     89     return state == stateInternal();
     90 }
     91 
     92 void History::back(ExecutionContext* context)
     93 {
     94     go(context, -1);
     95 }
     96 
     97 void History::forward(ExecutionContext* context)
     98 {
     99     go(context, 1);
    100 }
    101 
    102 void History::go(ExecutionContext* context, int distance)
    103 {
    104     if (!m_frame)
    105         return;
    106 
    107     ASSERT(isMainThread());
    108     Document* activeDocument = toDocument(context);
    109     if (!activeDocument)
    110         return;
    111 
    112     if (!activeDocument->canNavigate(*m_frame))
    113         return;
    114 
    115     m_frame->navigationScheduler().scheduleHistoryNavigation(distance);
    116 }
    117 
    118 KURL History::urlForState(const String& urlString)
    119 {
    120     Document* document = m_frame->document();
    121 
    122     if (urlString.isNull())
    123         return document->url();
    124     if (urlString.isEmpty())
    125         return document->baseURL();
    126 
    127     return KURL(document->baseURL(), urlString);
    128 }
    129 
    130 void History::stateObjectAdded(PassRefPtr<SerializedScriptValue> data, const String& /* title */, const String& urlString, FrameLoadType type, ExceptionState& exceptionState)
    131 {
    132     if (!m_frame || !m_frame->page() || !m_frame->loader().documentLoader())
    133         return;
    134 
    135     KURL fullURL = urlForState(urlString);
    136     if (!fullURL.isValid() || !m_frame->document()->securityOrigin()->canRequest(fullURL)) {
    137         // We can safely expose the URL to JavaScript, as a) no redirection takes place: JavaScript already had this URL, b) JavaScript can only access a same-origin History object.
    138         exceptionState.throwSecurityError("A history state object with URL '" + fullURL.elidedString() + "' cannot be created in a document with origin '" + m_frame->document()->securityOrigin()->toString() + "'.");
    139         return;
    140     }
    141     m_frame->loader().updateForSameDocumentNavigation(fullURL, SameDocumentNavigationHistoryApi, data, type);
    142 }
    143 
    144 } // namespace blink
    145