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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 "History.h"
     28 
     29 #include "BackForwardController.h"
     30 #include "Document.h"
     31 #include "ExceptionCode.h"
     32 #include "Frame.h"
     33 #include "FrameLoader.h"
     34 #include "FrameLoaderClient.h"
     35 #include "HistoryItem.h"
     36 #include "Page.h"
     37 
     38 namespace WebCore {
     39 
     40 History::History(Frame* frame)
     41     : m_frame(frame)
     42 {
     43 }
     44 
     45 Frame* History::frame() const
     46 {
     47     return m_frame;
     48 }
     49 
     50 void History::disconnectFrame()
     51 {
     52     m_frame = 0;
     53 }
     54 
     55 unsigned History::length() const
     56 {
     57     if (!m_frame)
     58         return 0;
     59     if (!m_frame->page())
     60         return 0;
     61     return m_frame->page()->backForward()->count();
     62 }
     63 
     64 void History::back()
     65 {
     66     go(-1);
     67 }
     68 
     69 void History::back(ScriptExecutionContext* context)
     70 {
     71     go(context, -1);
     72 }
     73 
     74 void History::forward()
     75 {
     76     go(1);
     77 }
     78 
     79 void History::forward(ScriptExecutionContext* context)
     80 {
     81     go(context, 1);
     82 }
     83 
     84 void History::go(int distance)
     85 {
     86     if (!m_frame)
     87         return;
     88 
     89     m_frame->navigationScheduler()->scheduleHistoryNavigation(distance);
     90 }
     91 
     92 void History::go(ScriptExecutionContext* context, int distance)
     93 {
     94     if (!m_frame)
     95         return;
     96 
     97     ASSERT(WTF::isMainThread());
     98     Frame* activeFrame = static_cast<Document*>(context)->frame();
     99     if (!activeFrame)
    100         return;
    101 
    102     if (!activeFrame->loader()->shouldAllowNavigation(m_frame))
    103         return;
    104 
    105     m_frame->navigationScheduler()->scheduleHistoryNavigation(distance);
    106 }
    107 
    108 KURL History::urlForState(const String& urlString)
    109 {
    110     KURL baseURL = m_frame->loader()->baseURL();
    111     if (urlString.isEmpty())
    112         return baseURL;
    113 
    114     return KURL(baseURL, urlString);
    115 }
    116 
    117 void History::stateObjectAdded(PassRefPtr<SerializedScriptValue> data, const String& title, const String& urlString, StateObjectType stateObjectType, ExceptionCode& ec)
    118 {
    119     if (!m_frame || !m_frame->page())
    120         return;
    121 
    122     KURL fullURL = urlForState(urlString);
    123     if (!fullURL.isValid() || !m_frame->document()->securityOrigin()->canRequest(fullURL)) {
    124         ec = SECURITY_ERR;
    125         return;
    126     }
    127 
    128     if (stateObjectType == StateObjectPush)
    129         m_frame->loader()->history()->pushState(data, title, fullURL.string());
    130     else if (stateObjectType == StateObjectReplace)
    131         m_frame->loader()->history()->replaceState(data, title, fullURL.string());
    132 
    133     if (!urlString.isEmpty())
    134         m_frame->document()->updateURLForPushOrReplaceState(fullURL);
    135 
    136     if (stateObjectType == StateObjectPush)
    137         m_frame->loader()->client()->dispatchDidPushStateWithinPage();
    138     else if (stateObjectType == StateObjectReplace)
    139         m_frame->loader()->client()->dispatchDidReplaceStateWithinPage();
    140 }
    141 
    142 } // namespace WebCore
    143