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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/page/History.h"
     28 
     29 #include "bindings/v8/ExceptionState.h"
     30 #include "bindings/v8/SerializedScriptValue.h"
     31 #include "core/dom/Document.h"
     32 #include "core/dom/ExceptionCode.h"
     33 #include "core/history/BackForwardController.h"
     34 #include "core/history/HistoryItem.h"
     35 #include "core/loader/DocumentLoader.h"
     36 #include "core/loader/FrameLoader.h"
     37 #include "core/loader/FrameLoaderClient.h"
     38 #include "core/page/Frame.h"
     39 #include "core/page/Page.h"
     40 #include "weborigin/KURL.h"
     41 #include "weborigin/SecurityOrigin.h"
     42 #include "wtf/MainThread.h"
     43 
     44 namespace WebCore {
     45 
     46 History::History(Frame* frame)
     47     : DOMWindowProperty(frame)
     48     , m_lastStateObjectRequested(0)
     49 {
     50     ScriptWrappable::init(this);
     51 }
     52 
     53 unsigned History::length() const
     54 {
     55     if (!m_frame)
     56         return 0;
     57     if (!m_frame->page())
     58         return 0;
     59     return m_frame->page()->backForward()->count();
     60 }
     61 
     62 SerializedScriptValue* History::state()
     63 {
     64     m_lastStateObjectRequested = stateInternal();
     65     return m_lastStateObjectRequested.get();
     66 }
     67 
     68 SerializedScriptValue* History::stateInternal() const
     69 {
     70     if (!m_frame)
     71         return 0;
     72 
     73     if (HistoryItem* historyItem = m_frame->loader()->history()->currentItem())
     74         return historyItem->stateObject();
     75 
     76     return 0;
     77 }
     78 
     79 bool History::stateChanged() const
     80 {
     81     return m_lastStateObjectRequested != stateInternal();
     82 }
     83 
     84 bool History::isSameAsCurrentState(SerializedScriptValue* state) const
     85 {
     86     return state == stateInternal();
     87 }
     88 
     89 void History::back()
     90 {
     91     go(-1);
     92 }
     93 
     94 void History::back(ScriptExecutionContext* context)
     95 {
     96     go(context, -1);
     97 }
     98 
     99 void History::forward()
    100 {
    101     go(1);
    102 }
    103 
    104 void History::forward(ScriptExecutionContext* context)
    105 {
    106     go(context, 1);
    107 }
    108 
    109 void History::go(int distance)
    110 {
    111     if (!m_frame)
    112         return;
    113 
    114     m_frame->navigationScheduler()->scheduleHistoryNavigation(distance);
    115 }
    116 
    117 void History::go(ScriptExecutionContext* context, int distance)
    118 {
    119     if (!m_frame)
    120         return;
    121 
    122     ASSERT(isMainThread());
    123     Document* activeDocument = toDocument(context);
    124     if (!activeDocument)
    125         return;
    126 
    127     if (!activeDocument->canNavigate(m_frame))
    128         return;
    129 
    130     m_frame->navigationScheduler()->scheduleHistoryNavigation(distance);
    131 }
    132 
    133 KURL History::urlForState(const String& urlString)
    134 {
    135     KURL baseURL = m_frame->document()->baseURL();
    136     if (urlString.isEmpty())
    137         return baseURL;
    138 
    139     return KURL(baseURL, urlString);
    140 }
    141 
    142 void History::stateObjectAdded(PassRefPtr<SerializedScriptValue> data, const String& title, const String& urlString, SameDocumentNavigationSource sameDocumentNavigationSource, ExceptionState& es)
    143 {
    144     if (!m_frame || !m_frame->page())
    145         return;
    146 
    147     KURL fullURL = urlForState(urlString);
    148     if (!fullURL.isValid() || !m_frame->document()->securityOrigin()->canRequest(fullURL)) {
    149         es.throwDOMException(SecurityError, "A history state object with URL '" + fullURL.elidedString() + "' cannot be created in a document with origin '" + m_frame->document()->securityOrigin()->toString() + "'.");
    150         return;
    151     }
    152     m_frame->loader()->updateForSameDocumentNavigation(fullURL, sameDocumentNavigationSource, data, title, FrameLoader::DoNotUpdateBackForwardList);
    153 }
    154 
    155 } // namespace WebCore
    156