/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "config.h"
#include "PingLoader.h"

#include "FormData.h"
#include "Frame.h"
#include "FrameLoaderClient.h"
#include "Page.h"
#include "ProgressTracker.h"
#include "ResourceHandle.h"
#include "SecurityOrigin.h"
#include <wtf/OwnPtr.h>
#include <wtf/UnusedParam.h>
#include <wtf/text/CString.h>

namespace WebCore {

void PingLoader::loadImage(Frame* frame, const KURL& url)
{
    if (!frame->document()->securityOrigin()->canDisplay(url)) {
        FrameLoader::reportLocalLoadFailed(frame, url);
        return;
    }

    ResourceRequest request(url);
    request.setTargetType(ResourceRequest::TargetIsImage);
    request.setHTTPHeaderField("Cache-Control", "max-age=0");
    if (!SecurityOrigin::shouldHideReferrer(request.url(), frame->loader()->outgoingReferrer()))
        request.setHTTPReferrer(frame->loader()->outgoingReferrer());
    frame->loader()->addExtraFieldsToSubresourceRequest(request);
    OwnPtr<PingLoader> pingLoader = adoptPtr(new PingLoader(frame, request));
    
    // Leak the ping loader, since it will kill itself as soon as it receives a response.
    PingLoader* leakedPingLoader = pingLoader.leakPtr();
    UNUSED_PARAM(leakedPingLoader);
}

// http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#hyperlink-auditing
void PingLoader::sendPing(Frame* frame, const KURL& pingURL, const KURL& destinationURL)
{
    ResourceRequest request(pingURL);
    request.setTargetType(ResourceRequest::TargetIsSubresource);
    request.setHTTPMethod("POST");
    request.setHTTPContentType("text/ping");
    request.setHTTPBody(FormData::create("PING"));
    request.setHTTPHeaderField("Cache-Control", "max-age=0");
    frame->loader()->addExtraFieldsToSubresourceRequest(request);

    SecurityOrigin* sourceOrigin = frame->document()->securityOrigin();
    RefPtr<SecurityOrigin> pingOrigin = SecurityOrigin::create(pingURL);
    FrameLoader::addHTTPOriginIfNeeded(request, sourceOrigin->toString());
    request.setHTTPHeaderField("Ping-To", destinationURL);
    if (sourceOrigin->isSameSchemeHostPort(pingOrigin.get()))
        request.setHTTPHeaderField("Ping-From", frame->document()->url());
    else if (!SecurityOrigin::shouldHideReferrer(pingURL, frame->loader()->outgoingReferrer()))
        request.setHTTPReferrer(frame->loader()->outgoingReferrer());
    OwnPtr<PingLoader> pingLoader = adoptPtr(new PingLoader(frame, request));
    
    // Leak the ping loader, since it will kill itself as soon as it receives a response.
    PingLoader* leakedPingLoader = pingLoader.leakPtr();
    UNUSED_PARAM(leakedPingLoader);
}

PingLoader::PingLoader(Frame* frame, const ResourceRequest& request)
    : m_timeout(this, &PingLoader::timeout)
{
    unsigned long identifier = frame->page()->progress()->createUniqueIdentifier();
    m_shouldUseCredentialStorage = frame->loader()->client()->shouldUseCredentialStorage(frame->loader()->activeDocumentLoader(), identifier);
    m_handle = ResourceHandle::create(frame->loader()->networkingContext(), request, this, false, false);

    // If the server never responds, FrameLoader won't be able to cancel this load and
    // we'll sit here waiting forever. Set a very generous timeout, just in case.
    m_timeout.startOneShot(60000);
}

PingLoader::~PingLoader()
{
    m_handle->cancel();
}

}