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+/*
+
+    Authentication method specific conversation plugin for KDE's greeter widgets
+
+    Copyright (C) 2003 Oswald Buddenhagen <ossi@kde.org>
+    Copyright (C) 2003 Fabian Kaiser <xfk@softpro.de>
+
+    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 KGREETERPLUGIN_H
+#define KGREETERPLUGIN_H
+
+#include <tqvariant.h>
+#include <tqmessagebox.h>
+#include <kdemacros.h>
+
+class KdmThemer;
+
+class TQWidget;
+class TQLayoutItem;
+
+class KGreeterPluginHandler {
+public:
+    /* keep in sync with V_IS_* */
+    enum { IsSecret = 1, IsUser = 2, IsPassword = 4, IsOldPassword = 8,
+           IsNewPassword = 16 };
+    /**
+     * Reply to textPrompt().
+     * @param text text to return to core; null to abort auth cycle
+     * @param tag zero or one of Is*
+     */
+    virtual void gplugReturnText( const char *text, int tag ) = 0;
+    /**
+     * Reply to binaryPrompt().
+     * @param data data in pam_client format to return to the core;
+     *  null to abort auth cycle
+     */
+    virtual void gplugReturnBinary( const char *data ) = 0;
+    /**
+     * Tell the greeter who is logging in.
+     * Call this preferably before gplugStart, as otherwise the .dmrc
+     * load will be delayed. Don't call at all if your plugin doesn't
+     * have the Local flag set. Call only for internally generated
+     * user changes.
+     * @param user the user logging in
+     */
+    virtual void gplugSetUser( const TQString &user ) = 0;
+    /**
+     * Start processing.
+     */
+    virtual void gplugStart() = 0;
+    /**
+     * Plugins that expect user input from a different device than the mouse or
+     * keyboard must call this when user activity is detected to prevent the
+     * greeter from resetting/going away. Events should be compressed to no
+     * more than ten per second; one every five seconds is actually enough.
+     * Events should be actual changes to the input fields, not random motion.
+     */
+    virtual void gplugActivity() = 0;
+    /**
+     * Show a message box on behalf of the talker.
+     * @param type message severity
+     * @param text message text
+     */
+    virtual void gplugMsgBox( TQMessageBox::Icon type, const TQString &text ) = 0;
+};
+
+/**
+ * Abstract base class for conversation plugins ("talkers") to be used with
+ * TDM, kdesktop_lock, etc.
+ * The authentication method used by a particular instance of a plugin
+ * may be configurable, but the instance must handle exactly one method,
+ * i.e., info->method must be determined at the latest at init() time.
+ */
+class KGreeterPlugin {
+public:
+    KGreeterPlugin( KGreeterPluginHandler *h ) : handler( h ) {}
+    virtual ~KGreeterPlugin() {}
+
+    /**
+     * Variations of the talker:
+     * - Authenticate: authentication
+     * - AuthChAuthTok: authentication and password change
+     * - ChAuthTok: password change
+     */
+    enum Function { Authenticate, AuthChAuthTok, ChAuthTok };
+
+    /**
+     * Contexts the talker can be used in:
+     * - Login: tdm login dialog
+     * - Shutdown: tdm shutdown dialog
+     * - Unlock: tdm unlock dialog (TODO)
+     * - ChangeTok: tdm password change dialog (TODO)
+     * - ExUnlock: kdesktop_lock unlock dialog
+     * - ExChangeTok: kdepasswd password change dialog (TODO)
+     *
+     * The Ex* contexts exist within a running session; the talker must know
+     * how to obtain the currently logged in user (+ domain/realm, etc.)
+     * itself (i.e., fixedEntity will be null). The non-Ex variants will have
+     * a fixedEntity passed in.
+     */
+    enum Context { Login, Shutdown, Unlock, ChangeTok,
+                   ExUnlock, ExChangeTok };
+
+    /**
+     * Provide the talker with a list of selectable users. This can be used
+     * for autocompletion, etc.
+     * Will be called only when not running.
+     * @param users the users to load.
+     */
+    virtual void loadUsers( const TQStringList &users ) = 0;
+
+    /**
+     * Preload the talker with an (opaque to the greeter) entity.
+     * Will be called only when not running.
+     * @param entity the entity to preload the talker with. That
+     *  will usually be something like "user" or "user@domain".
+     * @param field the sub-widget (probably line edit) to put the cursor into.
+     *  If -1, preselect the user for timed login. This means pre-filling
+     *  the password field with anything, disabling it, and placing the
+     *  cursor in the user name field.
+     */
+    virtual void presetEntity( const TQString &entity, int field ) = 0;
+
+    /**
+     * Obtain the actually logged in entity.
+     * Will be called only after succeeded() was called.
+     */
+    virtual TQString getEntity() const = 0;
+
+    /**
+     * "Push" a user into the talker. That can be a click into the user list
+     * or successful authentication without the talker calling gplugSetUser.
+     * Will be called only when running.
+     * @param user the user to set. Note that this is a UNIX login, not a
+     *  canonical entity
+     */
+    virtual void setUser( const TQString &user ) = 0;
+
+    /**
+     * "Push" a password into the talker.
+     * @param pass the password to set.
+     */
+    virtual void setPassword( const TQString &pass ) = 0;
+
+    /**
+     * En-/disable any widgets contained in the talker.
+     * Will be called only when not running.
+     * @param on the state to set
+     */
+    virtual void setEnabled( bool on ) = 0;
+
+    /**
+     * Called when a message from the authentication backend arrives.
+     * @param message the message received from the backend
+     * @param error if true, @p message is an error message, otherwise it's
+     *  an informational message
+     * @return true means that the talker already handled the message, false
+     *  that the greeter should display it in a message box
+     *
+     * FIXME: Filtering a message usually means that the backend issued a
+     * prompt and obtains the authentication data itself. However, in that
+     * state the backend is unresponsive, e.g., no shutdown is possible.
+     * The frontend could send the backend a signal, but the "escape path"
+     * within the backend is unclear (PAM won't like simply longjmp()ing
+     * out of it).
+     */
+    virtual bool textMessage( const char *message, bool error ) = 0;
+
+    /**
+     * Prompt the user for data. Reply by calling handler->gplugReturnText().
+     * @param propmt the prompt to display. It may be null, in which case
+     *  "Username"/"Password" should be shown and the replies should be tagged
+     *  with the respective Is* flag.
+     * @param echo if true, a normal input widget can be used, otherwise one that
+     *  visually obscures the user's input.
+     * @param nonBlocking if true, report whatever is already available,
+     *  otherwise wait for user input.
+     */
+    virtual void textPrompt( const char *prompt, bool echo, bool nonBlocking ) = 0;
+
+    /**
+     * Request binary authentication data from the talker. Reply by calling
+     * handler->gplugReturnBinary().
+     * @param prompt prompt in pam_client format
+     * @param nonBlocking if true, report whatever is already available,
+     *  otherwise wait for user input.
+     * @return always true for now
+     *
+     * TODO:
+     * @return if true, the prompt was handled by the talker, otherwise the
+     *  handler has to use libpam_client to obtain the authentication data.
+     *  In that state the talker still can abort the data fetch by
+     *  gplugReturn()ing a null array. When the data was obtained, another
+     *  binaryPrompt with a null prompt will be issued.
+     */
+    virtual bool binaryPrompt( const char *prompt, bool nonBlocking ) = 0;
+
+    /**
+     * This can either
+     *  - Start a processing cycle. Will be called only when not running.
+     *  - Restart authTok cycle - will be called while running and implies
+     *    revive(). PAM is a bit too clever, so we need this.
+     * In any case the talker is running afterwards.
+     */
+    virtual void start() = 0;
+
+    /**
+     * Request to suspend the auth. Make sure that a second talker of any
+     * type will be able to operate while this one is suspended (no busy
+     * device nodes, etc.).
+     * Will be called only if running within Login context. (Actually it
+     * won't be called at all, but be prepared.)
+     */
+    virtual void suspend() = 0;
+
+    /**
+     * Request to resume the auth from the point it was suspended at.
+     * Will be called only when suspended.
+     */
+    virtual void resume() = 0;
+
+    /**
+     * The "login" button was pressed in the greeter.
+     * This might call gplugReturn* or gplugStart.
+     * Will be called only when running.
+     */
+    virtual void next() = 0;
+
+    /**
+     * Abort auth cycle. Note that this should _not_ clear out already
+     * entered auth tokens if they are still on the screen.
+     * Will be called only when running and stops it.
+     */
+    virtual void abort() = 0;
+
+    /**
+     * Indicate successful end of the current phase.
+     * This is more or less a request to disable editable widgets
+     * responsible for the that phase.
+     * There will be no further attempt to enter that phase until the
+     * widget is destroyed.
+     * Will be called only when running and stops it.
+     */
+    virtual void succeeded() = 0;
+
+    /**
+     * Indicate unsuccessful end of the current phase.
+     * This is mostly a request to disable all editable widgets.
+     * The widget will be treated as dead until revive() is called.
+     * Will be called only when running and stops it.
+     */
+    virtual void failed() = 0;
+
+    /**
+     * Prepare retrying the previously failed phase.
+     * This is mostly a request to re-enable all editable widgets failed()
+     * disabled previously, clear the probably incorrect authentication tokens
+     * and to set the input focus appropriately.
+     * Will be called only after failed() (possibly with clear() in between),
+     * or after presetEntity() with field -1.
+     */
+    virtual void revive() = 0;
+
+    /**
+     * Clear any edit widgets, particularily anything set by setUser.
+     * Will be called only when not running.
+     */
+    virtual void clear() = 0;
+
+    /**
+     * Obtain the TQLayoutItem containg the widget(s) to actually handle the
+     * conversation. See TQLayout and TQWidgetItem for possible implementations.
+     */
+    TQLayoutItem *getLayoutItem() const { return layoutItem; }
+
+protected:
+    KGreeterPluginHandler *handler;
+    TQLayoutItem *layoutItem;
+};
+
+struct KDE_EXPORT kgreeterplugin_info {
+    /**
+     * Human readable name of this plugin (should be a little more
+     * informative than just the libary name). Must be I18N_NOOP()ed.
+     */
+    const char *name;
+
+    /**
+     * The authentication method to use - the meaning is up to the backend,
+     * but will usually be related to the PAM service.
+     */
+    const char *method;
+
+    /**
+     * Capabilities.
+     */
+    enum {
+        /**
+         * All users exist on the local system permanently (will be listed
+         * by getpwent()); an entity corresponds to a UNIX user.
+         */
+        Local = 1,
+        /**
+         * The entities consist of multiple fields.
+         * PluginOptions/<plugin>.FocusField is used instead of FocusPasswd.
+         */
+        Fielded = 2,
+        /**
+         * An entity can be preset, the talker has a widget where a user can
+         * be selected explicitly. If the method is "classic", timed login
+         * is possible, too.
+         * This also means that setUser/gplugSetUser can be used and a
+         * userlist can be shown at all - provided Local is set as well.
+         */
+        Presettable = 4
+    };
+
+    /*
+     * Capability flags.
+     */
+    int flags;
+
+    /**
+     * Call after loading the plugin.
+     *
+     * @param method if non-empty and the plugin is unable to handle that
+     *  method, return false. If the plugin has a constant method defined
+     *  above, it can ignore this parameter.
+     * @param getConf can be used to obtain configuration items from the
+     *  greeter; you have to pass it the @p ctx pointer.
+     *   The only predefined key (in TDM) is "EchoMode", which is an int
+     *   (in fact, KPasswordEdit::EchoModes).
+     *   Other keys are obtained from the PluginOptions option; see tdmrc
+     *   for details.
+     *   If the key is unknown, dflt is returned.
+     * @param ctx context pointer for @p getConf
+     * @return if false, unload the plugin again (don't call done() first)
+     */
+    bool (*init)( const TQString &method,
+                  TQVariant (*getConf)( void *ctx, const char *key,
+                                       const TQVariant &dflt ),
+                  void *ctx );
+
+    /**
+     * Call before unloading the plugin.
+     * This pointer can be null.
+     */
+    void (*done)( void );
+
+    /**
+     * Factory method to create an instance of the plugin.
+     * Note that multiple instances can exist at one time, but only
+     * one of them is active at any moment (the others would be suspended
+     * or not running at all).
+     * @param handler the object offering the necessary callbacks
+     * @param parent parent widget
+     * @param predecessor the focus widget before the conversation widget
+     * @param fixedEntity see below
+     * @param func see below
+     * @param ctx see below
+     * @return an instance of this conversation plugin
+     *
+     * Valid combinations of Function and Context:
+     * - Authenticate:Login - init
+     * - Authenticate:Shutdown - init, for now "root" is passed as fixedEntitiy
+     *  and it is not supposed to be displayed. Plugins with Local not set
+     *  might have to conjure something up to make getEntity() return a
+     *  canonical entitiy. FIXME: don't restrict shutdown to root.
+     * - AuthChAuthTok:Login, AuthChAuthTok:Shutdown - cont/cont,
+     *  only relevant for classic method (as it is relevant only for password-
+     *  less logins, which always use classic). The login should not be shown -
+     *  it is known to the user already; the backend won't ask for it, either.
+     * - ChAuthTok:Login & ChAuthTok:Shutdown - cont
+     * - Authenticate:Unlock & Authenticate:ExUnlock - init,
+     *   AuthChAuthTok:ChangeTok & AuthChAuthTok:ExChangeTok - init/cont,
+     *  display fixedEntity as labels. The backend does not ask for the UNIX
+     *  login, as it already knows it - but it will ask for all components of
+     *  the entity if it is no UNIX login.
+     *
+     * "init" means that the plugin is supposed to call gplugStart, "cont"
+     * that the backend is already in a cycle of the method the plugin was
+     * initialized with.
+     */
+    KGreeterPlugin *(*create)( KGreeterPluginHandler *handler,
+                               KdmThemer *themer,
+                               TQWidget *parent, TQWidget *predecessor,
+                               const TQString &fixedEntity,
+                               KGreeterPlugin::Function func,
+                               KGreeterPlugin::Context ctx );
+};
+
+#endif