/*
 * Copyright (C) 2012 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:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  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.
 * 3.  Neither the name of Apple Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "MixedContentChecker.h"

#include "Document.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameLoaderClient.h"
#include "SecurityOrigin.h"
#include "Settings.h"
#include <wtf/text/CString.h>
#include <wtf/text/WTFString.h>

namespace WebCore {

MixedContentChecker::MixedContentChecker(Frame& frame)
    : m_frame(frame)
{
}

FrameLoaderClient& MixedContentChecker::client() const
{
    return m_frame.loader().client();
}

// static
bool MixedContentChecker::isMixedContent(SecurityOrigin* securityOrigin, const URL& url)
{
    if (securityOrigin->protocol() != "https")
        return false; // We only care about HTTPS security origins.

    // We're in a secure context, so |url| is mixed content if it's insecure.
    return !SecurityOrigin::isSecure(url);
}

bool MixedContentChecker::canDisplayInsecureContent(SecurityOrigin* securityOrigin, ContentType type, const URL& url) const
{
    if (!isMixedContent(securityOrigin, url))
        return true;

    bool allowed = m_frame.settings().allowDisplayOfInsecureContent() || type == ContentType::ActiveCanWarn;
    logWarning(allowed, "display", url);

    if (allowed)
        client().didDisplayInsecureContent();

    return allowed;
}

bool MixedContentChecker::canRunInsecureContent(SecurityOrigin* securityOrigin, const URL& url) const
{
    if (!isMixedContent(securityOrigin, url))
        return true;

    bool allowed = m_frame.settings().allowRunningOfInsecureContent();
    logWarning(allowed, "run", url);

    if (allowed)
        client().didRunInsecureContent(securityOrigin, url);

    return allowed;
}

void MixedContentChecker::checkFormForMixedContent(SecurityOrigin* securityOrigin, const URL& url) const
{
    // Unconditionally allow javascript: URLs as form actions as some pages do this and it does not introduce
    // a mixed content issue.
    if (protocolIsJavaScript(url))
        return;

    if (!isMixedContent(securityOrigin, url))
        return;

    String message = makeString("The page at ", m_frame.document()->url().stringCenterEllipsizedToLength(), " contains a form which targets an insecure URL ", url.stringCenterEllipsizedToLength(), ".\n");
    m_frame.document()->addConsoleMessage(MessageSource::Security, MessageLevel::Warning, message);

    client().didDisplayInsecureContent();
}

void MixedContentChecker::logWarning(bool allowed, const String& action, const URL& target) const
{
    const char* errorString = allowed ? " was allowed to " : " was not allowed to ";
    String message = makeString((allowed ? String() : "[blocked] "), "The page at ", m_frame.document()->url().stringCenterEllipsizedToLength(), errorString, action, " insecure content from ", target.stringCenterEllipsizedToLength(), ".\n");
    m_frame.document()->addConsoleMessage(MessageSource::Security, MessageLevel::Warning, message);
}

} // namespace WebCore