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