/* * This file is part of the KDE libraries * Copyright (C) 2000 Yves Arrouye * * 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 1.23 2002/03/04 04:17:37 lunakl Exp $" #include #include #include class KURIFilterPrivate; class KURIFilterDataPrivate; class TQStringList; class TDECModule; /** * This is a basic message object used for exchanging filtering * information between the filter plugins and the application * whenever the application requires more information about the * URI than just a filtered version of it. Any application can * create an instance of this class and send it to @ref KURIFilter * to have the filter plugins fill the necessary information. * * @sect Example * 
*   TQString text = "kde.org";
*   KURIFilterData d = text;
*   bool filtered = KURIFilter::self()->filter( d );
*   if( filtered )
*     print ( "URI: %s\n"Filtered URI: %s\n URI Type: %i\n"Was Filtered: %i"
*             text.latin1(), d.uri().url().latin1(), d.uriType(), filtered );
*
* * The above code should yield the following output: * 
*   URI: kde.org
*   Filtered URI: http://kde.org
*   URI Type: 0            <== means NET_PROTOCOL
*   Was Filtered: 1        <== means the URL was successfully filtered
*
* * @short A message object for exchanging filtering URI info. */ class KURIFilterData { friend class KURIFilterPlugin; public: /** * Describes the type of URI to be filtered. * * This enumerator prvoides the return value for * @ref uriType. A breif description for each value: * * @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 TQString& 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 * @ref KURIFilter::filterURI() calls. * * @deprecated */ bool hasBeenFiltered() const { return m_bFiltered; } /** * Returns the filtered or the original URL. * * This function returns the filtered url if one * of the plugins sucessfully filtered the original * URL. Otherwise, it returns the original URL. * See @ref #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 TQString::null. * * @return the error message or a NULL when there is none. */ TQString errorMsg() const { return m_strErrMsg; } /** * Returns the URI type. * * This method always returns KURIFilterData::UNKNOWN * if the given URL was not filtered. */ 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 TQString& 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 works only for a local resource and * expects the absolute path to the relative URL set in this * meta object. If you are extracting the absolute path from * a KURL object, make sure you always set the argument below * using KURL::path() instead of KURL::url() so that "file:/" * would not be appended! Otherwise, the filter might not be * able to make correct determination whether the relative URL * locally exists! * * @param abs_path the abolute path to the local resource. * @return true if absolute path is successfully set. Otherwise, false. */ bool setAbsolutePath( const TQString& /* abs_path */ ); /** * Returns the absolute path if one has already been set. */ TQString absolutePath() const; /** * Returns true if the supplied data has an absolute path. */ bool hasAbsolutePath() const; /** * Returns the command line options and arguments for a * local resource when present. * * @return options and arguments when present, otherwise TQString::null */ TQString argsAndOptions() const; /** * Returns true if the current data is a local resource with * 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 */ TQString iconName(); /** * 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 TQString * to a KURIFilterData object. * * @return an instance of a KURIFilterData object. */ KURIFilterData& operator=( const TQString& url ) { init( url ); return *this; } protected: /** * Initializes the KURIFilterData on construction. */ void init( const KURL& url = TQString::null ); private: bool m_bFiltered; bool m_bChanged; TQString m_strErrMsg; TQString 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 functionalities * should inherit from this abstract class and provide a * specific filtering implementation. * * All inheriting classes need to implement the pure * virtual function @ref filterURI. Otherwise, they * would also become abstract. * * @short Abstract class for URI filter plugins. */ class KURIFilterPlugin : public TQObject { Q_OBJECT public: /** * Constructs a filter plugin with a given name and * priority. * * @param parent the parent object. * @param name the name of the plugin. * @param pri the priority of the plugin. */ KURIFilterPlugin( TQObject *parent = 0, const char *name = 0, double pri = 1.0 ); /** * Returns the filter's name. * * @return A string naming the filter. */ virtual TQString 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 responsability of the caller to delete the module * once it is not needed anymore. * * @return A configuration module, @p null if the filter isn't configurable. */ virtual TDECModule *configModule( TQWidget*, const char* ) const { return 0; } /** * Returns the name of the configuration module for the filter. * * @return the name of a configuration module or @p null if none. */ virtual TQString 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 TQString& 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 TQString& args ) const; TQString m_strName; double m_dblPriority; protected: virtual void virtual_hook( int id, void* data ); private: class KURIFilterPluginPrivate *d; }; class KURIFilterPluginList : public TQPtrList { 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 a URI. * * 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. That is, new filters can be added in * the future by simply inheriting from @ref KURIFilterPlugin and * implementing the @ref 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. * * @sect Example * * To simply filter a given string: * 
 * bool filtered = KURIFilter::self()->filterURI( "kde.org" );
 *
* * You can alternatively use a KURL: * 
 * KURL url = "kde.org";
 * bool filtered = KURIFilter::self()->filterURI( url );
 *
* * 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: * 
 * TQString u = KURIFilter::self()->filteredURI( "kde.org" );
 *
* * You can also specify only specific filter(s) to be applied * by supplying the name(s) of the filter(s). By defualt all * filters that are found are loaded when the KURIFilter object * is created will be used. These names are taken from the * enteries in the \".desktop\" files. Here are a couple of * examples: * 
 * TQString text = "kde.org";
 * bool filtered = KURIFilter::self()->filterURI( text, "TDEShortURIFilter" );
 *
 * TQStringList list;
 * list << "TDEShortURIFilter" << "MyFilter";
 * bool filtered = KURIFilter::self()->filterURI( text, list );
 *
* * 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 @ref KURIFilterData for examples and details. * * @short Filters a given URL into its proper format whenever possible. */ class KURIFilter { public: /** * Destructor */ ~KURIFilter (); /** * Return a static instance of KURIFilter. */ static KURIFilter* self(); /** * Filters the URI given by the object URIFilterData. * * This filters the given data based on the specified * filter list. If the list is empty all avaliable * filter plugins would be used. If not, only those * given in the list are used. * * @param data object that contains the URI to be filtered. * @param filters specify the list filters to be used * * @return a boolean indicating whether the URI has been changed */ bool filterURI( KURIFilterData& data, const TQStringList& filters = TQStringList() ); /** * Filters the URI given by the URL. * * This filters the given URL based on the specified * filter list. If the list is empty all avaliable * filter plugins would be used. If not, only those * given in the list are 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 TQStringList& filters = TQStringList() ); /** * Filters a string representing a URI. * * This filters the given string based on the specified * filter list. If the list is empty all avaliable * filter plugins would be used. If not, only those * given in the list are used. * * @param uri The URI to filter. * @param filters specify the list filters to be used * * @return a boolean indicating whether the URI has been changed */ bool filterURI( TQString &uri, const TQStringList& filters = TQStringList() ); /** * Returns the filtered URI. * * This filters the given URL based on the specified * filter list. If the list is empty all avaliable * filter plugins would be used. If not, only those * given in the list are used. * * @param uri The URI to filter. * @param filters specify the list filters to be used * * @return the filtered URI or null if it cannot be filtered */ KURL filteredURI( const KURL &uri, const TQStringList& filters = TQStringList() ); /** * Return a filtered string representation of a URI. * * This filters the given URL based on the specified * filter list. If the list is empty all avaliable * filter plugins would be used. If not, only those * given in the list are used. * * @param uri the URI to filter. * @param filters specify the list filters to be used * * @return the filtered URI or null if it cannot be filtered */ TQString filteredURI( const TQString &uri, const TQStringList& filters = TQStringList() ); /** * Return an iterator to iterate over all loaded * plugins. * * @return a plugin iterator. */ TQPtrListIterator pluginsIterator() const; protected: /** * A protected constructor. * * This constructor creates a KURIFilter and * initializes all plugins it can find by invoking * @ref loadPlugins. */ KURIFilter(); /** * Loads all allowed plugins. * * This function loads all filters that have not * been dis */ void loadPlugins(); private: static KURIFilter *m_self; KURIFilterPluginList m_lstPlugins; KURIFilterPrivate *d; }; #endif