/*
    Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#include "config.h"
#include "qwebsecurityorigin.h"
#include "qwebsecurityorigin_p.h"
#include "qwebdatabase.h"
#include "qwebdatabase_p.h"

#include "DatabaseTracker.h"
#include "KURL.h"
#include "SchemeRegistry.h"
#include "SecurityOrigin.h"
#include <QStringList>

using namespace WebCore;

/*!
    \class QWebSecurityOrigin
    \since 4.5
    \brief The QWebSecurityOrigin class defines a security boundary for web sites.

    \inmodule QtWebKit

    QWebSecurityOrigin provides access to the security domains defined by web sites.
    An origin consists of a host name, a scheme, and a port number. Web sites
    with the same security origin can access each other's resources for client-side
    scripting or databases.

    For example the site \c{http://www.example.com/my/page.html} is allowed to share the same
    database as \c{http://www.example.com/my/overview.html}, or access each other's
    documents when used in HTML frame sets and JavaScript. At the same time it prevents
    \c{http://www.malicious.com/evil.html} from accessing \c{http://www.example.com/}'s resources,
    because they are of a different security origin.

    By default local schemes like \c{file://} and \c{qrc://} are concidered to be in the same
    security origin, and can access each other's resources. You can add additional local schemes
    by using QWebSecurityOrigin::addLocalScheme(), or override the default same-origin behavior
    by setting QWebSettings::LocalContentCanAccessFileUrls to \c{false}.

    \note Local resources are by default restricted from accessing remote content, which
    means your \c{file://} will not be able to access \c{http://domain.com/foo.html}. You
    can relax this restriction by setting QWebSettings::LocalContentCanAccessRemoteUrls to
    \c{true}.

    Call QWebFrame::securityOrigin() to get the QWebSecurityOrigin for a frame in a
    web page, and use host(), scheme() and port() to identify the security origin.

    Use databases() to access the databases defined within a security origin. The
    disk usage of the origin's databases can be limited with setDatabaseQuota().
    databaseQuota() and databaseUsage() report the current limit as well as the
    current usage.

    For more information refer to the
    \l{http://en.wikipedia.org/wiki/Same_origin_policy}{"Same origin policy" Wikipedia Article}.

    \sa QWebFrame::securityOrigin()
*/

/*!
    Constructs a security origin from \a other.
*/
QWebSecurityOrigin::QWebSecurityOrigin(const QWebSecurityOrigin& other) : d(other.d)
{
}

/*!
    Assigns the \a other security origin to this.
*/
QWebSecurityOrigin& QWebSecurityOrigin::operator=(const QWebSecurityOrigin& other)
{
    d = other.d;
    return *this;
}

/*!
    Returns the scheme defining the security origin.
*/
QString QWebSecurityOrigin::scheme() const
{
    return d->origin->protocol();
}

/*!
    Returns the host name defining the security origin.
*/
QString QWebSecurityOrigin::host() const
{
    return d->origin->host();
}

/*!
    Returns the port number defining the security origin.
*/
int QWebSecurityOrigin::port() const
{
    return d->origin->port();
}

/*!
    Returns the number of bytes all databases in the security origin
    use on the disk.
*/
qint64 QWebSecurityOrigin::databaseUsage() const
{
#if ENABLE(DATABASE)
    return DatabaseTracker::tracker().usageForOrigin(d->origin.get());
#else
    return 0;
#endif
}

/*!
    Returns the quota for the databases in the security origin.
*/
qint64 QWebSecurityOrigin::databaseQuota() const
{
#if ENABLE(DATABASE)
    return DatabaseTracker::tracker().quotaForOrigin(d->origin.get());
#else
    return 0;
#endif
}

/*!
    Sets the quota for the databases in the security origin to \a quota bytes.

    If the quota is set to a value less than the current usage, the quota will remain
    and no data will be purged to meet the new quota. However, no new data can be added
    to databases in this origin.
*/
void QWebSecurityOrigin::setDatabaseQuota(qint64 quota)
{
#if ENABLE(DATABASE)
    DatabaseTracker::tracker().setQuota(d->origin.get(), quota);
#endif
}

/*!
    Destroys the security origin.
*/
QWebSecurityOrigin::~QWebSecurityOrigin()
{
}

/*!
    \internal
*/
QWebSecurityOrigin::QWebSecurityOrigin(QWebSecurityOriginPrivate* priv)
{
    d = priv;
}

/*!
    Returns a list of all security origins with a database quota defined.
*/
QList<QWebSecurityOrigin> QWebSecurityOrigin::allOrigins()
{
    QList<QWebSecurityOrigin> webOrigins;

#if ENABLE(DATABASE)
    Vector<RefPtr<SecurityOrigin> > coreOrigins;
    DatabaseTracker::tracker().origins(coreOrigins);

    for (unsigned i = 0; i < coreOrigins.size(); ++i) {
        QWebSecurityOriginPrivate* priv = new QWebSecurityOriginPrivate(coreOrigins[i].get());
        webOrigins.append(priv);
    }
#endif

    return webOrigins;
}

/*!
    Returns a list of all databases defined in the security origin.
*/
QList<QWebDatabase> QWebSecurityOrigin::databases() const
{
    QList<QWebDatabase> databases;

#if ENABLE(DATABASE)
    Vector<String> nameVector;

    if (!DatabaseTracker::tracker().databaseNamesForOrigin(d->origin.get(), nameVector))
        return databases;
    for (unsigned i = 0; i < nameVector.size(); ++i) {
        QWebDatabasePrivate* priv = new QWebDatabasePrivate();
        priv->name = nameVector[i];
        priv->origin = this->d->origin;
        QWebDatabase webDatabase(priv);
        databases.append(webDatabase);
    }
#endif

    return databases;
}

/*!
    \since 4.6

    Adds the given \a scheme to the list of schemes that are considered equivalent
    to the \c file: scheme.

    Cross domain restrictions depend on the two web settings QWebSettings::LocalContentCanAccessFileUrls
    and QWebSettings::LocalContentCanAccessFileUrls. By default all local schemes are concidered to be
    in the same security origin, and local schemes can not access remote content.
*/
void QWebSecurityOrigin::addLocalScheme(const QString& scheme)
{
    SchemeRegistry::registerURLSchemeAsLocal(scheme);
}

/*!
    \since 4.6

    Removes the given \a scheme from the list of local schemes.

    \note You can not remove the \c{file://} scheme from the list
    of local schemes.

    \sa addLocalScheme()
*/
void QWebSecurityOrigin::removeLocalScheme(const QString& scheme)
{
    SchemeRegistry::removeURLSchemeRegisteredAsLocal(scheme);
}

/*!
    \since 4.6
    Returns a list of all the schemes concidered to be local.

    By default this is \c{file://} and \c{qrc://}.

    \sa addLocalScheme(), removeLocalScheme()
*/
QStringList QWebSecurityOrigin::localSchemes()
{
    QStringList list;
    const URLSchemesMap& map = SchemeRegistry::localURLSchemes();
    URLSchemesMap::const_iterator end = map.end();
    for (URLSchemesMap::const_iterator i = map.begin(); i != end; ++i) {
        const QString scheme = *i;
        list.append(scheme);
    }
    return list;
}
