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+/*
+ *  This file is part of the KDE libraries
+ *  Copyright (C) 2000-2001,2003 Dawit Alemayehu <adawit at kde.org>
+ *
+ *  Original author
+ *  Copyright (C) 2000 Yves Arrouye <yves@realnames.com>
+ *
+ *
+ *  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.
+ **/
+
+#ifndef __kurifilter_h__
+#define __kurifilter_h__ "$Id: kurifilter.h,v 1.41 2003/08/30 08:56:21 raabe Exp $"
+
+#include <qptrlist.h>
+#include <qobject.h>
+#include <qstringlist.h>
+
+#include <kurl.h>
+#include <kdemacros.h>
+
+class KURIFilterPrivate;
+class KURIFilterDataPrivate;
+
+class KCModule;
+
+/**
+* A basic message object used for exchanging filtering
+* information between the filter plugins and the application
+* requesting the filtering service.
+*
+* Use this object if you require a more detailed information
+* about the URI you want to filter. Any application can create
+* an instance of this class and send it to KURIFilter to
+* have the plugins fill out all possible information about the
+* URI.
+*
+* \b Example
+*
+* \code
+*   QString text = "kde.org";
+*   KURIFilterData d = text;
+*   bool filtered = KURIFilter::self()->filter( d );
+*   cout << "URL: " << text.latin1() << endl
+*        << "Filtered URL: " << d.uri().url().latin1() << endl
+*        << "URI Type: " << d.uriType() << endl
+*        << "Was Filtered: " << filtered << endl;
+* \endcode
+*
+* The above code should yield the following output:
+* \code
+*   URI: kde.org
+*   Filtered URI: http://kde.org
+*   URI Type: 0            <== means NET_PROTOCOL
+*   Was Filtered: 1        <== means the URL was successfully filtered
+* \endcode
+*
+* @short A message object for exchanging filtering URI info.
+* @author Dawit Alemayehu <adawit at kde.org>
+*/
+
+class KURIFilterData
+{
+friend class KURIFilterPlugin;
+
+public:
+    /**
+     * Describes the type of the URI that was filtered.
+     * Here is a brief description of the types:
+     *
+     * @li NET_PROTOCOL - Any network protocol: http, ftp, nttp, pop3, etc...
+     * @li LOCAL_FILE   - A local file whose executable flag is not set
+     * @li LOCAL_DIR    - A local directory
+     * @li EXECUTABLE   - A local file whose executable flag is set
+     * @li HELP         - A man or info page
+     * @li SHELL        - A shell executable (ex: echo "Test..." >> ~/testfile)
+     * @li BLOCKED      - A URI that should be blocked/filtered (ex: ad filtering)
+     * @li ERROR        - An incorrect URI (ex: "~johndoe" when user johndoe
+     *                    does not exist in that system )
+     * @li UNKNOWN      - A URI that is not identified. Default value when
+     *                    a KURIFilterData is first created.
+     */
+    enum URITypes { NET_PROTOCOL=0, LOCAL_FILE, LOCAL_DIR, EXECUTABLE, HELP, SHELL, BLOCKED, ERROR, UNKNOWN };
+
+    /**
+     * Default constructor.
+     *
+     * Creates a URIFilterData object.
+     */
+    KURIFilterData() { init(); }
+
+    /**
+     * Creates a URIFilterData object from the given URL.
+     *
+     * @param url is the URL to be filtered.
+     */
+    KURIFilterData( const KURL& url ) { init( url); }
+
+    /**
+     * Creates a URIFilterData object from the given string.
+     *
+     * @param url is the string to be filtered.
+     */
+    KURIFilterData( const QString& url ) { init( url ); }
+
+    /**
+     * Copy constructor.
+     *
+     * Creates a URIFilterData object from another
+     * URI filter data object.
+     *
+     * @param data the uri filter data to be copied.
+     */
+    KURIFilterData( const KURIFilterData& data);
+
+    /**
+     * Destructor.
+     */
+    ~KURIFilterData();
+
+    /**
+     * This method has been deprecated and will always return
+     * true.  You should instead use the result from the
+     * KURIFilter::filterURI() calls.
+     *
+     * @deprecated
+     */
+    KDE_DEPRECATED bool hasBeenFiltered() const { return true; }
+
+    /**
+     * Returns the filtered or the original URL.
+     *
+     * This function returns the filtered url if one
+     * of the plugins successfully filtered the original
+     * URL.  Otherwise, it returns the original URL.
+     * See hasBeenFiltered() and
+     *
+     * @return the filtered or original url.
+     */
+    KURL uri() const { return m_pURI; }
+
+    /**
+     * Returns an error message.
+     *
+     * This functions returns the error message set
+     * by the plugin whenever the uri type is set to
+     * KURIFilterData::ERROR.  Otherwise, it returns
+     * a QString::null.
+     *
+     * @return the error message or a NULL when there is none.
+     */
+    QString errorMsg() const { return m_strErrMsg; }
+
+    /**
+     * Returns the URI type.
+     *
+     * This method always returns KURIFilterData::UNKNOWN
+     * if the given URL was not filtered.
+     * @return the type of the URI
+     */
+    URITypes uriType() const { return m_iType; }
+
+    /**
+     * Sets the URL to be filtered.
+     *
+     * Use this function to set the string to be
+     * filtered when you construct an empty filter
+     * object.
+     *
+     * @param url the string to be filtered.
+     */
+    void setData( const QString& url ) { init( url ); }
+
+    /**
+     * Same as above except the argument is a URL.
+     *
+     * Use this function to set the string to be
+     * filtered when you construct an empty filter
+     * object.
+     *
+     * @param url the URL to be filtered.
+     */
+    void setData( const KURL& url ) { init( url ); }
+
+    /**
+     * Sets the absolute path to be used whenever the supplied
+     * data is a relative local URL.
+     *
+     * NOTE: This function should only be used for local resources,
+     * i.e. the "file:/" protocol. It is useful for specifying the
+     * absolute path in cases where the actual URL might be relative.
+     * meta object.  If deriving the path from a KURL, make sure you
+     * set the argument for this function to the result of calling
+     * path () instead of url ().
+     *
+     * @param abs_path  the abolute path to the local resource.
+     * @return true if absolute path is successfully set. Otherwise, false.
+     */
+    bool setAbsolutePath( const QString& abs_path );
+
+    /**
+     * Returns the absolute path if one has already been set.
+     * @return the absolute path, or QString::null
+     * @see hasAbsolutePath()
+     */
+    QString absolutePath() const;
+
+    /**
+     * Checks whether the supplied data had an absolute path.
+     * @return true if the supplied data has an absolute path
+     * @see absolutePath()
+     */
+    bool hasAbsolutePath() const;
+
+    /**
+     * Returns the command line options and arguments for a
+     * local resource when present.
+     *
+     * @return options and arguments when present, otherwise QString::null
+     */
+    QString argsAndOptions() const;
+
+    /**
+     * Checks whether the current data is a local resource with
+     * command line options and arguments.
+     * @return true if the current data has command line options and arguments
+     */
+    bool hasArgsAndOptions() const;
+
+    /**
+     * Returns the name of the icon that matches
+     * the current filtered URL.
+     *
+     * NOTE that this function will return a NULL
+     * string by default and when no associated icon
+     * is found.
+     *
+     * @return the name of the icon associated with the resource,
+     *         or QString::null if not found
+     */
+    QString iconName();
+
+    /**
+     * Check whether the provided uri is executable or not.
+     *
+     * Setting this to false ensures that typing the name of
+     * an executable does not start that application. This is
+     * useful in the location bar of a browser. The default
+     * value is true.
+     *
+     * @since 3.2
+     */
+    void setCheckForExecutables (bool check);
+
+    /**
+     * @return true if the filters should attempt to check whether the
+     * supplied uri is an executable. False otherwise.
+     *
+     * @since 3.2
+     */
+    bool checkForExecutables() const { return m_bCheckForExecutables; }
+
+    /**
+     * @return the string as typed by the user, before any URL processing is done
+     * @since 3.2
+     */
+    QString typedString() const;
+
+    /**
+     * Overloaded assigenment operator.
+     *
+     * This function allows you to easily assign a KURL
+     * to a KURIFilterData object.
+     *
+     * @return an instance of a KURIFilterData object.
+     */
+    KURIFilterData& operator=( const KURL& url ) { init( url ); return *this; }
+
+    /**
+     * Overloaded assigenment operator.
+     *
+     * This function allows you to easily assign a QString
+     * to a KURIFilterData object.
+     *
+     * @return an instance of a KURIFilterData object.
+     */
+    KURIFilterData& operator=( const QString& url ) { init( url ); return *this; }
+
+protected:
+
+    /**
+     * Initializes the KURIFilterData on construction.
+     * @param url the URL to initialize the object with
+     */
+    void init( const KURL& url);
+
+    /**
+     * Initializes the KURIFilterData on construction.
+     * @param url the URL to initialize the object with
+     */
+    void init( const QString& url = QString::null );
+
+private:
+    bool m_bCheckForExecutables;
+    bool m_bChanged;
+
+    QString m_strErrMsg;
+    QString m_strIconName;
+
+    KURL m_pURI;
+    URITypes m_iType;
+    KURIFilterDataPrivate *d;
+};
+
+
+/**
+ * Base class for URI filter plugins.
+ *
+ * This class applies a single filter to a URI.  All plugins designed
+ * to provide URI filtering service should inherit from this abstract
+ * class and provide a concrete implementation.
+ *
+ * All inheriting classes need to implement the pure virtual function
+ * filterURI.
+ *
+ * @short Abstract class for URI filter plugins.
+ */
+class KURIFilterPlugin : public QObject
+{
+    Q_OBJECT
+
+public:
+
+    /**
+     * Constructs a filter plugin with a given name and
+     * priority.
+     *
+     * @param parent the parent object, or 0 for no parent
+     * @param name the name of the plugin, or 0 for no name
+     * @param pri the priority of the plugin.
+     */
+    KURIFilterPlugin( QObject *parent = 0, const char *name = 0, double pri = 1.0 );
+
+    /**
+     * Returns the filter's name.
+     *
+     * @return A string naming the filter.
+     */
+    virtual QString name() const { return m_strName; }
+
+    /**
+     * Returns the filter's priority.
+     *
+     * Each filter has an assigned priority, a float from 0 to 1. Filters
+     * with the lowest priority are first given a chance to filter a URI.
+     *
+     * @return The priority of the filter.
+     */
+    virtual double priority() const { return m_dblPriority; }
+
+    /**
+     * Filters a URI.
+     *
+     * @param data the URI data to be filtered.
+     * @return A boolean indicating whether the URI has been changed.
+     */
+    virtual bool filterURI( KURIFilterData& data ) const = 0;
+
+    /**
+     * Creates a configuration module for the filter.
+     *
+     * It is the responsibility of the caller to delete the module
+     * once it is not needed anymore.
+     *
+     * @return A configuration module, 0 if the filter isn't configurable.
+     */
+    virtual KCModule *configModule( QWidget*, const char* ) const { return 0; }
+
+    /**
+     * Returns the name of the configuration module for the filter.
+     *
+     * @return the name of a configuration module or QString::null if none.
+     */
+    virtual QString configName() const { return name(); }
+
+protected:
+
+    /**
+     * Sets the the URL in @p data to @p uri.
+     */
+    void setFilteredURI ( KURIFilterData& data, const KURL& uri ) const;
+
+    /**
+     * Sets the error message in @p data to @p errormsg.
+     */
+    void setErrorMsg ( KURIFilterData& data, const QString& errmsg ) const {
+        data.m_strErrMsg = errmsg;
+    }
+
+    /**
+     * Sets the URI type in @p data to @p type.
+     */
+    void setURIType ( KURIFilterData& data, KURIFilterData::URITypes type) const {
+        data.m_iType = type;
+        data.m_bChanged = true;
+    }
+
+    /**
+     * Sets the arguments and options string in @p data
+     * to @p args if any were found during filterting.
+     */
+    void setArguments( KURIFilterData& data, const QString& args ) const;
+
+    QString m_strName;
+    double m_dblPriority;
+
+protected:
+    virtual void virtual_hook( int id, void* data );
+private:
+    class KURIFilterPluginPrivate *d;
+};
+
+
+/**
+ * A list of filter plugins.
+ */
+class KURIFilterPluginList : public QPtrList<KURIFilterPlugin>
+{
+public:
+    virtual int compareItems(Item a, Item b)
+    {
+      double diff = ((KURIFilterPlugin *) a)->priority() - ((KURIFilterPlugin *) b)->priority();
+      return diff < 0 ? -1 : (diff > 0 ? 1 : 0);
+    }
+
+private:
+    KURIFilterPrivate *d;
+
+};
+
+/**
+ * Manages the filtering of URIs.
+ *
+ * The intention of this plugin class is to allow people to extend the
+ * functionality of KURL without modifying it directly. This way KURL will
+ * remain a generic parser capable of parsing any generic URL that adheres
+ * to specifications.
+ *
+ * The KURIFilter class applies a number of filters to a URI and returns the
+ * filtered version whenever possible. The filters are implemented using
+ * plugins to provide easy extensibility of the filtering mechanism. New
+ * filters can be added in the future by simply inheriting from
+ * KURIFilterPlugin and implementing the KURIFilterPlugin::filterURI
+ * method.
+ *
+ * Use of this plugin-manager class is straight forward.  Since it is a
+ * singleton object, all you have to do is obtain an instance by doing
+ * @p KURIFilter::self() and use any of the public member functions to
+ * preform the filtering.
+ *
+ * \b Example
+ *
+ * To simply filter a given string:
+ *
+ * \code
+ * bool filtered = KURIFilter::self()->filterURI( "kde.org" );
+ * \endcode
+ *
+ * You can alternatively use a KURL:
+ *
+ * \code
+ * KURL url = "kde.org";
+ * bool filtered = KURIFilter::self()->filterURI( url );
+ * \endcode
+ *
+ * If you have a constant string or a constant URL, simply invoke the
+ * corresponding function to obtain the filtered string or URL instead
+ * of a boolean flag:
+ *
+ * \code
+ * QString u = KURIFilter::self()->filteredURI( "kde.org" );
+ * \endcode
+ *
+ * You can also restrict the filter(s) to be used by supplying
+ * the name of the filter(s) to use.  By defualt all available
+ * filters will be used. To use specific filters, add the names
+ * of the filters you want to use to a QStringList and invoke
+ * the appropriate filtering function. The examples below show
+ * the use of specific filters. The first one uses a single
+ * filter called kshorturifilter while the second example uses
+ * multiple filters:
+ *
+ * \code
+ * QString text = "kde.org";
+ * bool filtered = KURIFilter::self()->filterURI( text, "kshorturifilter" );
+ * \endcode
+ *
+ * \code
+ * QStringList list;
+ * list << "kshorturifilter" << "localdomainfilter";
+ * bool filtered = KURIFilter::self()->filterURI( text, list );
+ * \endcode
+ *
+ * KURIFilter also allows richer data exchange through a simple
+ * meta-object called @p KURIFilterData. Using this meta-object
+ * you can find out more information about the URL you want to
+ * filter. See KURIFilterData for examples and details.
+ *
+ * @short Filters a given URL into its proper format whenever possible.
+ */
+
+class KURIFilter
+{
+public:
+    /**
+     *  Destructor
+     */
+    ~KURIFilter ();
+
+    /**
+     * Returns an instance of KURIFilter.
+     */
+    static KURIFilter* self();
+
+    /**
+     * Filters the URI given by the object URIFilterData.
+     *
+     * The given URL is filtered based on the specified list of filters.
+     * If the list is empty all available filters would be used.
+     *
+     * @param data object that contains the URI to be filtered.
+     * @param filters specify the list of filters to be used.
+     *
+     * @return a boolean indicating whether the URI has been changed
+     */
+    bool filterURI( KURIFilterData& data, const QStringList& filters = QStringList() );
+
+    /**
+     * Filters the URI given by the URL.
+     *
+     * The given URL is filtered based on the specified list of filters.
+     * If the list is empty all available filters would be used.
+     *
+     * @param uri the URI to filter.
+     * @param filters specify the list of filters to be used.
+     *
+     * @return a boolean indicating whether the URI has been changed
+     */
+    bool filterURI( KURL &uri, const QStringList& filters = QStringList() );
+
+    /**
+     * Filters a string representing a URI.
+     *
+     * The given URL is filtered based on the specified list of filters.
+     * If the list is empty all available filters would be used.
+     *
+     * @param uri The URI to filter.
+     * @param filters specify the list of filters to be used.
+     *
+     * @return a boolean indicating whether the URI has been changed
+     */
+    bool filterURI( QString &uri, const QStringList& filters = QStringList() );
+
+    /**
+     * Returns the filtered URI.
+     *
+     * The given URL is filtered based on the specified list of filters.
+     * If the list is empty all available filters would be used.
+     *
+     * @param uri The URI to filter.
+     * @param filters specify the list of filters to be used.
+     *
+     * @return the filtered URI or null if it cannot be filtered
+     */
+    KURL filteredURI( const KURL &uri, const QStringList& filters = QStringList() );
+
+    /**
+     * Return a filtered string representation of a URI.
+     *
+     * The given URL is filtered based on the specified list of filters.
+     * If the list is empty all available filters would be used.
+     *
+     * @param uri the URI to filter.
+     * @param filters specify the list of filters to be used.
+     *
+     * @return the filtered URI or null if it cannot be filtered
+     */
+    QString filteredURI( const QString &uri, const QStringList& filters = QStringList() );
+
+    /**
+     * Return an iterator to iterate over all loaded
+     * plugins.
+     *
+     * @return a plugin iterator.
+     */
+    QPtrListIterator<KURIFilterPlugin> pluginsIterator() const;
+
+    /**
+     * Return a list of the names of all loaded plugins.
+     *
+     * @return a QStringList of plugin names
+     * @since 3.1
+     */
+    QStringList pluginNames() const;
+
+protected:
+
+    /**
+     * A protected constructor.
+     *
+     * This constructor creates a KURIFilter and
+     * initializes all plugins it can find by invoking
+     * loadPlugins.
+     */
+    KURIFilter();
+
+    /**
+     * Loads all allowed plugins.
+     *
+     * This function loads all filters that have not
+     * been disbled.
+     */
+    void loadPlugins();
+
+private:
+    static KURIFilter *m_self;
+    KURIFilterPluginList m_lstPlugins;
+    KURIFilterPrivate *d;
+};
+
+#endif