/*
 * Copyright (C) 2011, 2015 Apple 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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 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 "SecurityOriginData.h"

#include "Document.h"
#include "Frame.h"
#include "SecurityOrigin.h"
#include <wtf/FileSystem.h>
#include <wtf/text/CString.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/text/StringConcatenateNumbers.h>

namespace WebCore {

String SecurityOriginData::toString() const
{
    if (protocol == "file")
        return "file://"_s;

    if (!port)
        return makeString(protocol, "://", host);
    return makeString(protocol, "://", host, ':', static_cast<uint32_t>(*port));
}

SecurityOriginData SecurityOriginData::fromFrame(Frame* frame)
{
    if (!frame)
        return SecurityOriginData { };
    
    auto* document = frame->document();
    if (!document)
        return SecurityOriginData { };

    return document->securityOrigin().data();
}

Ref<SecurityOrigin> SecurityOriginData::securityOrigin() const
{
    return SecurityOrigin::create(protocol.isolatedCopy(), host.isolatedCopy(), port);
}

static const char separatorCharacter = '_';

String SecurityOriginData::databaseIdentifier() const
{
    // Historically, we've used the following (somewhat non-sensical) string
    // for the databaseIdentifier of local files. We used to compute this
    // string because of a bug in how we handled the scheme for file URLs.
    // Now that we've fixed that bug, we still need to produce this string
    // to avoid breaking existing persistent state.
    if (equalIgnoringASCIICase(protocol, "file"))
        return "file__0"_s;
    
    StringBuilder stringBuilder;
    stringBuilder.append(protocol);
    stringBuilder.append(separatorCharacter);
    stringBuilder.append(FileSystem::encodeForFileName(host));
    stringBuilder.append(separatorCharacter);
    stringBuilder.appendNumber(port.valueOr(0));
    
    return stringBuilder.toString();
}

Optional<SecurityOriginData> SecurityOriginData::fromDatabaseIdentifier(const String& databaseIdentifier)
{
    // Make sure there's a first separator
    size_t separator1 = databaseIdentifier.find(separatorCharacter);
    if (separator1 == notFound)
        return WTF::nullopt;
    
    // Make sure there's a second separator
    size_t separator2 = databaseIdentifier.reverseFind(separatorCharacter);
    if (separator2 == notFound)
        return WTF::nullopt;
    
    // Ensure there were at least 2 separator characters. Some hostnames on intranets have
    // underscores in them, so we'll assume that any additional underscores are part of the host.
    if (separator1 == separator2)
        return WTF::nullopt;
    
    // Make sure the port section is a valid port number or doesn't exist
    bool portOkay;
    int port = databaseIdentifier.right(databaseIdentifier.length() - separator2 - 1).toInt(&portOkay);
    bool portAbsent = (separator2 == databaseIdentifier.length() - 1);
    if (!(portOkay || portAbsent))
        return WTF::nullopt;
    
    if (port < 0 || port > std::numeric_limits<uint16_t>::max())
        return WTF::nullopt;
    
    auto protocol = databaseIdentifier.substring(0, separator1);
    auto host = databaseIdentifier.substring(separator1 + 1, separator2 - separator1 - 1);
    if (!port)
        return SecurityOriginData { protocol, host, WTF::nullopt };

    return SecurityOriginData { protocol, host, static_cast<uint16_t>(port) };
}

SecurityOriginData SecurityOriginData::isolatedCopy() const
{
    SecurityOriginData result;

    result.protocol = protocol.isolatedCopy();
    result.host = host.isolatedCopy();
    result.port = port;

    return result;
}

bool operator==(const SecurityOriginData& a, const SecurityOriginData& b)
{
    if (&a == &b)
        return true;

    return a.protocol == b.protocol
        && a.host == b.host
        && a.port == b.port;
}

} // namespace WebCore