path: root/mail/mail-session.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* mail-session.c: handles the session information and resource manipulation */
/*
 *  Copyright 2001 Ximian, Inc. (www.ximian.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>

#include <gtk/gtkdialog.h>
#include <gtk/gtkstock.h>

#include <libgnome/gnome-config.h>
#include <libgnome/gnome-sound.h>
#include <gal/widgets/e-unicode.h>

#include "camel/camel-filter-driver.h"
#include "filter/filter-context.h"
#include "filter/filter-filter.h"
#include "mail.h"
#include "mail-session.h"
#include "mail-tools.h"
#include "mail-mt.h"
#include "mail-ops.h"
#include "e-util/e-passwords.h"
#include "e-util/e-msgport.h"

#define d(x)

CamelSession *session;


#define MAIL_SESSION_TYPE     (mail_session_get_type ())
#define MAIL_SESSION(obj)     (CAMEL_CHECK_CAST((obj), MAIL_SESSION_TYPE, MailSession))
#define MAIL_SESSION_CLASS(k) (CAMEL_CHECK_CLASS_CAST ((k), MAIL_SESSION_TYPE, MailSessionClass))
#define MAIL_IS_SESSION(o)    (CAMEL_CHECK_TYPE((o), MAIL_SESSION_TYPE))

#define MAIL_SESSION_LOCK(s, l) (e_mutex_lock(((MailSession *)s)->l))
#define MAIL_SESSION_UNLOCK(s, l) (e_mutex_unlock(((MailSession *)s)->l))

typedef struct _MailSession {
    CamelSession parent_object;

    gboolean interactive;
    FILE *filter_logfile;

    EMutex *lock;

    MailAsyncEvent *async;

    /* must all be accessed with lock held ! */
    unsigned int timeout_id;/* next camel timneout id */
    EDList timeouts;    /* list of struct _timeout_data's of current or pending removed timeouts */
} MailSession;

typedef struct _MailSessionClass {
    CamelSessionClass parent_class;

} MailSessionClass;

static char *get_password(CamelSession *session, const char *prompt, gboolean secret, CamelService *service, const char *item, CamelException *ex);
static void forget_password(CamelSession *session, CamelService *service, const char *item, CamelException *ex);
static gboolean alert_user(CamelSession *session, CamelSessionAlertType type, const char *prompt, gboolean cancel);
static guint register_timeout(CamelSession *session, guint32 interval, CamelTimeoutCallback cb, gpointer camel_data);
static gboolean remove_timeout(CamelSession *session, guint handle);
static CamelFilterDriver *get_filter_driver(CamelSession *session, const char *type, CamelException *ex);

static void
init (MailSession *session)
{
    session->lock = e_mutex_new(E_MUTEX_REC);
    session->timeout_id = 1; /* first timeout id */
    session->async = mail_async_event_new();
    e_dlist_init(&session->timeouts);
}

static void
finalise (MailSession *session)
{
    mail_async_event_destroy(session->async);
    e_mutex_destroy(session->lock);
}

static void
class_init (MailSessionClass *mail_session_class)
{
    CamelSessionClass *camel_session_class = CAMEL_SESSION_CLASS (mail_session_class);
    
    /* virtual method override */
    camel_session_class->get_password = get_password;
    camel_session_class->forget_password = forget_password;
    camel_session_class->alert_user = alert_user;
    camel_session_class->get_filter_driver = get_filter_driver;
}

static CamelType
mail_session_get_type (void)
{
    static CamelType mail_session_type = CAMEL_INVALID_TYPE;
    
    if (mail_session_type == CAMEL_INVALID_TYPE) {
        mail_session_type = camel_type_register (
            camel_session_get_type (),
            "MailSession",
            sizeof (MailSession),
            sizeof (MailSessionClass),
            (CamelObjectClassInitFunc) class_init,
            NULL,
            (CamelObjectInitFunc) init,
            (CamelObjectFinalizeFunc) finalise);
    }
    
    return mail_session_type;
}


static char *
make_key (CamelService *service, const char *item)
{
    char *key;
    
    if (service)
        key = camel_url_to_string (service->url, CAMEL_URL_HIDE_PASSWORD | CAMEL_URL_HIDE_PARAMS);
    else
        key = g_strdup (item);
    
    return key;
}

/* ********************************************************************** */

static GtkDialog *password_dialog = NULL;
static EDList password_list = E_DLIST_INITIALISER(password_list);

struct _pass_msg {
    struct _mail_msg msg;
    
    CamelSession *session;
    const char *prompt;
    gboolean secret;
    CamelService *service;
    const char *item;
    CamelException *ex;
    
    char *service_url;
    char *key;
    
    MailConfigService *config_service;
    GtkWidget *check;
    GtkWidget *entry;
    char *result;
    int ismain;
};

static void do_get_pass(struct _mail_msg *mm);

static void
pass_response (GtkDialog *dialog, int button, void *data)
{
    struct _pass_msg *m = data;
    
    switch (button) {
    case GTK_RESPONSE_OK: {
        gboolean cache, remember;
        
        m->result = g_strdup (gtk_entry_get_text ((GtkEntry *) m->entry));
        remember = cache = m->check ? gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (m->check)) : FALSE;
        
        if (m->service_url) {
            if (m->service) {
                mail_config_service_set_save_passwd (m->config_service, cache);
                
                /* set `cache' to TRUE because people don't want to have to
                   re-enter their passwords for this session even if they told
                   us not to cache their passwords in the dialog...*sigh* */
                cache = TRUE;
            }
        } else {
            /* we can't remember the password if it isn't for an account (pgp?) */
            remember = FALSE;
        }
        
        if (cache) {
            /* cache the password for the session */
            e_passwords_add_password (m->key, m->result);
            
            /* should we remember it between sessions? */
            if (remember)
                e_passwords_remember_password ("Mail", m->key);
        }
        break; }
    default:
        camel_exception_set (m->ex, CAMEL_EXCEPTION_USER_CANCEL, _("User canceled operation."));
        break;
    }
    
    gtk_widget_destroy ((GtkWidget *) dialog);
    
    password_dialog = NULL;
    e_msgport_reply ((EMsg *)m);
    
    if ((m = (struct _pass_msg *) e_dlist_remhead (&password_list)))
        do_get_pass ((struct _mail_msg *) m);
}

static void
request_password (struct _pass_msg *m)
{
    const MailConfigAccount *mca = NULL;
    char *title;
    
    /* If we already have a password_dialog up, save this request till later */
    if (!m->ismain && password_dialog) {
        e_dlist_addtail (&password_list, (EDListNode *)m);
        return;
    }
    
    if (m->service_url) {
        if ((mca = mail_config_get_account_by_source_url (m->service_url)))
            m->config_service = mca->source;
        else if ((mca = mail_config_get_account_by_transport_url (m->service_url)))
            m->config_service = mca->transport;
    }
    
    if (mca)
        title = g_strdup_printf (_("Enter Password for %s"), mca->name);
    else
        title = g_strdup (_("Enter Password"));
    
    password_dialog = (GtkDialog *) gtk_message_dialog_new (NULL, 0, GTK_MESSAGE_QUESTION,
                                GTK_BUTTONS_OK_CANCEL, "%s", m->prompt);
    
    g_signal_connect (password_dialog, "response", G_CALLBACK (pass_response), m);
    gtk_window_set_title (GTK_WINDOW (password_dialog), title);
    g_free (title);
    
    m->entry = gtk_entry_new ();
    gtk_entry_set_visibility ((GtkEntry *) m->entry, !m->secret);
    gtk_box_pack_start (GTK_BOX (GTK_DIALOG (password_dialog)->vbox), m->entry, TRUE, FALSE, 0);
    gtk_widget_show (m->entry);
    
    if (m->service_url == NULL || m->service != NULL) {
        m->check = gtk_check_button_new_with_mnemonic (m->service_url? _("_Remember this password") :
                                   _("_Remember this password for the remainder of this session"));
        gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (m->check), m->config_service->save_passwd);
        gtk_box_pack_start (GTK_BOX (GTK_DIALOG (password_dialog)->vbox), m->check, TRUE, FALSE, 0);
        gtk_widget_show (m->check);
    }
    
    if (m->ismain)
        gtk_dialog_run (password_dialog);
    else
        gtk_widget_show ((GtkWidget *) password_dialog);
}

static void
do_get_pass(struct _mail_msg *mm)
{
    struct _pass_msg *m = (struct _pass_msg *)mm;
    MailSession *mail_session = MAIL_SESSION (m->session);
    
    if (!strcmp (m->item, "popb4smtp_uri")) {
        char *url = camel_url_to_string(m->service->url, 0);
        const MailConfigAccount *account = mail_config_get_account_by_transport_url(url);
        
        g_free(url);
        if (account)
            m->result = g_strdup(account->source->url);
    } else if (m->key) {
        m->result = e_passwords_get_password ("Mail", m->key);
        if (m->result == NULL) {
            if (mail_session->interactive) {
                request_password(m);
                return;
            }
        }
    }

    e_msgport_reply((EMsg *)mm);
}

static void
do_free_pass(struct _mail_msg *mm)
{
    struct _pass_msg *m = (struct _pass_msg *)mm;

    g_free(m->service_url);
    g_free(m->key);
}

static struct _mail_msg_op get_pass_op = {
    NULL,
    do_get_pass,
    NULL,
    do_free_pass,
};

static char *
get_password (CamelSession *session, const char *prompt, gboolean secret, CamelService *service, const char *item, CamelException *ex)
{
    struct _pass_msg *m, *r;
    EMsgPort *pass_reply;
    char *ret;

    /* We setup an async request and send it off, and wait for it to return */
    /* If we're really in main, we dont of course ...
       ... but this shouldn't be allowed because of locking issues */
    pass_reply = e_msgport_new ();
    m = mail_msg_new(&get_pass_op, pass_reply, sizeof(struct _pass_msg));
    m->ismain = pthread_self() == mail_gui_thread;
    m->session = session;
    m->prompt = prompt;
    m->secret = secret;
    m->service = service;
    m->item = item;
    m->ex = ex;
    if (service)
        m->service_url = camel_url_to_string (service->url, CAMEL_URL_HIDE_ALL);
    m->key = make_key(service, item);

    if (m->ismain)
        do_get_pass((struct _mail_msg *)m);
    else {
        extern EMsgPort *mail_gui_port2;

        e_msgport_put(mail_gui_port2, (EMsg *)m);
    }
    
    e_msgport_wait(pass_reply);
    r = (struct _pass_msg *)e_msgport_get(pass_reply);
    g_assert(m == r);

    ret = m->result;
    mail_msg_free(m);
    e_msgport_destroy(pass_reply);
    
    return ret;
}

static void
main_forget_password (CamelSession *session, CamelService *service, const char *item, CamelException *ex)
{
    char *key = make_key (service, item);
    
    e_passwords_forget_password ("Mail", key);
    
    g_free (key);
}

static void
forget_password (CamelSession *session, CamelService *service, const char *item, CamelException *ex)
{
    mail_call_main(MAIL_CALL_p_pppp, (MailMainFunc)main_forget_password,
               session, service, item, ex);
}

/* ********************************************************************** */

static GtkDialog *message_dialog;
static EDList message_list = E_DLIST_INITIALISER(password_list);

struct _user_message_msg {
    struct _mail_msg msg;

    CamelSessionAlertType type;
    const char *prompt;

    unsigned int allow_cancel:1;
    unsigned int result:1;
    unsigned int ismain:1;
};

static void do_user_message (struct _mail_msg *mm);

/* clicked, send back the reply */
static void
user_message_response (GtkDialog *dialog, int button, struct _user_message_msg *m)
{
    gtk_widget_destroy ((GtkWidget *) dialog);
    
    message_dialog = NULL;
    
    /* if !allow_cancel, then we've already replied */
    if (m->allow_cancel) {
        m->result = button == GTK_RESPONSE_OK;
        e_msgport_reply((EMsg *)m);
    }
    
    /* check for pendings */
    if ((m = (struct _user_message_msg *)e_dlist_remhead(&message_list)))
        do_user_message((struct _mail_msg *)m);
}

static void
do_user_message (struct _mail_msg *mm)
{
    struct _user_message_msg *m = (struct _user_message_msg *)mm;
    GtkMessageType msg_type;
    
    if (!m->ismain && message_dialog != NULL) {
        e_dlist_addtail (&message_list, (EDListNode *)m);
        return;
    }
    
    switch (m->type) {
    case CAMEL_SESSION_ALERT_INFO:
        msg_type = GTK_MESSAGE_INFO;
        break;
    case CAMEL_SESSION_ALERT_WARNING:
        msg_type = GTK_MESSAGE_WARNING;
        break;
    case CAMEL_SESSION_ALERT_ERROR:
        msg_type = GTK_MESSAGE_ERROR;
        break;
    default:
        msg_type = GTK_MESSAGE_INFO;
    }
    
    message_dialog = (GtkDialog *) gtk_message_dialog_new (
        NULL, 0, msg_type,
        m->allow_cancel ? GTK_BUTTONS_OK_CANCEL : GTK_BUTTONS_OK,
        m->prompt);
    gtk_dialog_set_default_response (message_dialog, m->allow_cancel ? GTK_RESPONSE_CANCEL : GTK_RESPONSE_OK);
    g_object_set ((GObject *) message_dialog, "allow_shrink", TRUE, "allow_grow", TRUE, NULL);
    
    /* We only need to wait for the result if we allow cancel otherwise show but send result back instantly */
    if (m->allow_cancel) {
        g_signal_connect (message_dialog, "response", G_CALLBACK (user_message_response), m);
        if (m->ismain)
            gtk_dialog_run (message_dialog);
        else
            gtk_widget_show ((GtkWidget *) message_dialog);
    } else {
        gtk_widget_show ((GtkWidget *) message_dialog);
        m->result = TRUE;
        e_msgport_reply ((EMsg *)m);
    }
}

static struct _mail_msg_op user_message_op = { NULL, do_user_message, NULL, NULL };

static gboolean
alert_user(CamelSession *session, CamelSessionAlertType type, const char *prompt, gboolean cancel)
{
    MailSession *mail_session = MAIL_SESSION (session);
    struct _user_message_msg *m, *r;
    EMsgPort *user_message_reply;
    gboolean ret;

    if (!mail_session->interactive)
        return FALSE;

    user_message_reply = e_msgport_new ();  
    m = mail_msg_new (&user_message_op, user_message_reply, sizeof (*m));
    m->ismain = pthread_self() == mail_gui_thread;
    m->type = type;
    m->prompt = prompt;
    m->allow_cancel = cancel;

    if (m->ismain)
        do_user_message((struct _mail_msg *)m);
    else {
        extern EMsgPort *mail_gui_port2;

        e_msgport_put(mail_gui_port2, (EMsg *)m);
    }

    e_msgport_wait(user_message_reply);
    r = (struct _user_message_msg *)e_msgport_get(user_message_reply);
    g_assert(m == r);

    ret = m->result;
    mail_msg_free(m);
    e_msgport_destroy(user_message_reply);

    return ret;
}

/* ******************** */

struct _timeout_data {
    struct _timeout_data *next;
    struct _timeout_data *prev;

    CamelSession *session;

    guint32 interval;

    CamelTimeoutCallback cb;
    void *camel_data;

    guint id;       /* the camel 'id' */
    guint timeout_id;   /* the gtk 'id' */

    unsigned int busy:1;        /* on if its currently running */
    unsigned int removed:1;     /* if its been removed since */
};

struct _timeout_msg {
    struct _mail_msg msg;

    CamelSession *session;
    unsigned int id;
    int result;
};

static struct _timeout_data *
find_timeout(EDList *list, unsigned int id)
{
    struct _timeout_data *td, *tn;

    td = (struct _timeout_data *)list->head;
    tn = td->next;
    while (tn) {
        if (td->id == id)
            return td;
        td = tn;
        tn = tn->next;
    }

    return NULL;
}

static void
timeout_timeout (struct _mail_msg *mm)
{
    struct _timeout_msg *m = (struct _timeout_msg *)mm;
    MailSession *ms = (MailSession *)m->session;
    struct _timeout_data *td;

    MAIL_SESSION_LOCK(ms, lock);
    td = find_timeout(&ms->timeouts, m->id);
    if (td && !td->removed) {
        if (td->busy) {
            g_warning("Timeout event dropped, still busy with last one");
        } else {
            td->busy = TRUE;
            m->result = td->cb(td->camel_data);
            td->busy = FALSE;
            td->removed = !m->result;
        }
    }
    MAIL_SESSION_UNLOCK(ms, lock);
}

static void
timeout_done (struct _mail_msg *mm)
{
    struct _timeout_msg *m = (struct _timeout_msg *) mm;
    MailSession *ms = (MailSession *) m->session;
    struct _timeout_data *td;
    
    if (!m->result) {
        MAIL_SESSION_LOCK(ms, lock);
        td = find_timeout (&ms->timeouts, m->id);
        if (td) {
            e_dlist_remove ((EDListNode *) td);
            if (td->timeout_id)
                gtk_timeout_remove (td->timeout_id);
            g_free (td);
        }
        MAIL_SESSION_UNLOCK(ms, lock);
    }
}

static void
timeout_free (struct _mail_msg *mm)
{
    struct _timeout_msg *m = (struct _timeout_msg *)mm;
    
    camel_object_unref (m->session);
}

static struct _mail_msg_op timeout_op = {
    NULL,
    timeout_timeout,
    timeout_done,
    timeout_free,
};

static gboolean 
camel_timeout (gpointer data)
{
    struct _timeout_data *td = data;
    struct _timeout_msg *m;
    
    /* stop if we are removed pending */
    if (td->removed)
        return FALSE;
    
    m = mail_msg_new (&timeout_op, NULL, sizeof (*m));
    
    m->session = td->session;
    camel_object_ref (td->session);
    m->id = td->id;
    
    e_thread_put (mail_thread_queued, (EMsg *)m);
    
    return TRUE;
}

static void
main_register_timeout (CamelSession *session, void *event_data, void *data)
{
    MailSession *ms = (MailSession *)session;
    unsigned int handle = (unsigned int)event_data;
    struct _timeout_data *td;
    
    MAIL_SESSION_LOCK(session, lock);
    td = find_timeout (&ms->timeouts, handle);
    if (td) {
        if (td->removed) {
            e_dlist_remove ((EDListNode *) td);
            if (td->timeout_id)
                gtk_timeout_remove (td->timeout_id);
            g_free (td);
        } else {
            td->timeout_id = gtk_timeout_add (td->interval, camel_timeout, td);
        }
    }
    MAIL_SESSION_UNLOCK(session, lock);
    
    camel_object_unref (ms);
}

static guint
register_timeout (CamelSession *session, guint32 interval, CamelTimeoutCallback cb, gpointer camel_data)
{
    struct _timeout_data *td;
    MailSession *ms = (MailSession *) session;
    guint ret;
    
    MAIL_SESSION_LOCK(session, lock);
    
    ret = ms->timeout_id;
    ms->timeout_id++;
    
    /* just debugging, the timeout code now ignores excessive events anyway */
    if (interval < 100)
        g_warning ("Timeout requested %d is small, may cause performance problems", interval);
    
    td = g_malloc (sizeof (*td));
    td->cb = cb;
    td->camel_data = camel_data;
    td->interval = interval;
    td->id = ret;
    td->session = session;
    td->removed = FALSE;
    td->busy = FALSE;
    e_dlist_addhead (&ms->timeouts, (EDListNode *) td);
    
    MAIL_SESSION_UNLOCK(session, lock);
    
    camel_object_ref (ms);
    mail_async_event_emit (ms->async, MAIL_ASYNC_GUI, (MailAsyncFunc) main_register_timeout,
                   (CamelObject *) session, (void *) ret, NULL);

    return ret;
}

static void
main_remove_timeout (CamelSession *session, void *event_data, void *data)
{
    MailSession *ms = (MailSession *) session;
    unsigned int handle = (unsigned int) event_data;
    struct _timeout_data *td;
    
    MAIL_SESSION_LOCK(session, lock);
    td = find_timeout (&ms->timeouts, handle);
    if (td) {
        e_dlist_remove ((EDListNode *) td);
        if (td->timeout_id)
            gtk_timeout_remove (td->timeout_id);
        g_free (td);
    }
    MAIL_SESSION_UNLOCK(session, lock);
    
    camel_object_unref (ms);
}

static gboolean
remove_timeout (CamelSession *session, guint handle)
{
    MailSession *ms = (MailSession *)session;
    struct _timeout_data *td;
    int remove = FALSE;
    
    MAIL_SESSION_LOCK(session, lock);
    td = find_timeout (&ms->timeouts, handle);
    if (td && !td->removed) {
        td->removed = TRUE;
        remove = TRUE;
    }
    MAIL_SESSION_UNLOCK(session, lock);
    
    if (remove) {
        camel_object_ref (ms);
        mail_async_event_emit (ms->async, MAIL_ASYNC_GUI, (MailAsyncFunc) main_remove_timeout,
                       (CamelObject *) session, (void *) handle, NULL);
    } else
        g_warning ("Removing a timeout i dont know about (or twice): %d", handle);

    return TRUE;
}

static CamelFolder *
get_folder (CamelFilterDriver *d, const char *uri, void *data, CamelException *ex)
{
    return mail_tool_uri_to_folder (uri, 0, ex);
}

static void
session_play_sound (CamelFilterDriver *driver, const char *filename, gpointer user_data)
{
    if (!filename || !*filename)
        gdk_beep ();
    else
        gnome_sound_play (filename);
}

static void
session_system_beep (CamelFilterDriver *driver, gpointer user_data)
{
    gdk_beep ();
}

static CamelFilterDriver *
main_get_filter_driver (CamelSession *session, const char *type, CamelException *ex)
{
    CamelFilterDriver *driver;
    RuleContext *fc;
    GString *fsearch, *faction;
    FilterRule *rule = NULL;
    char *user, *system;
    
    user = g_strdup_printf ("%s/filters.xml", evolution_dir);
    system = EVOLUTION_DATADIR "/evolution/filtertypes.xml";
    fc = (RuleContext *) filter_context_new ();
    rule_context_load (fc, system, user);
    g_free (user);
    
    driver = camel_filter_driver_new (session);
    camel_filter_driver_set_folder_func (driver, get_folder, NULL);
    
    if (mail_config_get_filter_log ()) {
        MailSession *ms = (MailSession *) session;
        
        if (ms->filter_logfile == NULL) {
            const char *filename;
            
            filename = mail_config_get_filter_log_path ();
            if (filename)
                ms->filter_logfile = fopen (filename, "a+");
        }
        if (ms->filter_logfile)
            camel_filter_driver_set_logfile (driver, ms->filter_logfile);
    }
    
    camel_filter_driver_set_shell_func (driver, mail_execute_shell_command, NULL);
    camel_filter_driver_set_play_sound_func (driver, session_play_sound, NULL);
    camel_filter_driver_set_system_beep_func (driver, session_system_beep, NULL);
    
    fsearch = g_string_new ("");
    faction = g_string_new ("");
    
    /* add the new-mail notification rule first to be sure that it gets invoked */
    
    /* FIXME: we need a way to distinguish between filtering new
           mail and re-filtering a folder because both use the
           "incoming" filter type */
    if (mail_config_get_new_mail_notify () && !strcmp (type, "incoming")) {
        g_string_truncate (faction, 0);
        
        g_string_append (faction, "(only-once \"new-mail-notification\" ");
        
        switch (mail_config_get_new_mail_notify ()) {
        case MAIL_CONFIG_NOTIFY_BEEP:
            g_string_append (faction, "\"(beep)\"");
            break;
        case MAIL_CONFIG_NOTIFY_PLAY_SOUND:
            g_string_sprintfa (faction, "\"(play-sound \\\"%s\\\")\"",
                       mail_config_get_new_mail_notify_sound_file ());
            break;
        default:
            break;
        }
        
        g_string_append (faction, ")");
        
        camel_filter_driver_add_rule (driver, "new-mail-notification", "(begin #t)", faction->str);
    }
    
    /* add the user-defined rules next */
    while ((rule = rule_context_next_rule (fc, rule, type))) {
        g_string_truncate (fsearch, 0);
        g_string_truncate (faction, 0);
        
        filter_rule_build_code (rule, fsearch);
        filter_filter_build_action ((FilterFilter *) rule, faction);
        
        camel_filter_driver_add_rule (driver, rule->name, fsearch->str, faction->str);
    }
    
    g_string_free (fsearch, TRUE);
    g_string_free (faction, TRUE);
    
    g_object_unref (fc);
    
    return driver;
}

static CamelFilterDriver *
get_filter_driver (CamelSession *session, const char *type, CamelException *ex)
{
    return (CamelFilterDriver *) mail_call_main (MAIL_CALL_p_ppp, (MailMainFunc) main_get_filter_driver,
                             session, type, ex);
}

char *
mail_session_get_password (const char *url_string)
{
    CamelURL *url;
    char *simple_url;
    char *passwd;
    
    url = camel_url_new (url_string, NULL);
    simple_url = camel_url_to_string (url, CAMEL_URL_HIDE_PASSWORD | CAMEL_URL_HIDE_PARAMS);
    camel_url_free (url);
    
    passwd = e_passwords_get_password ("Mail", simple_url);
    
    g_free (simple_url);
    
    return passwd;
}

void
mail_session_add_password (const char *url_string,
               const char *passwd)
{
    CamelURL *url;
    char *simple_url;
    
    url = camel_url_new (url_string, NULL);
    simple_url = camel_url_to_string (url, CAMEL_URL_HIDE_PASSWORD | CAMEL_URL_HIDE_PARAMS);
    camel_url_free (url);
    
    e_passwords_add_password (simple_url, passwd);
    
    g_free (simple_url);
}

void
mail_session_remember_password (const char *url_string)
{
    CamelURL *url;
    char *simple_url;
    
    url = camel_url_new (url_string, NULL);
    simple_url = camel_url_to_string (url, CAMEL_URL_HIDE_PASSWORD | CAMEL_URL_HIDE_PARAMS);
    camel_url_free (url);
    
    e_passwords_remember_password ("Mail", simple_url);
    
    g_free (simple_url);
}

void
mail_session_forget_password (const char *key)
{
    e_passwords_forget_password ("Mail", key);
}

void
mail_session_init (void)
{
    char *camel_dir;
    
    if (camel_init (evolution_dir, TRUE) != 0)
        exit (0);
    
    session = CAMEL_SESSION (camel_object_new (MAIL_SESSION_TYPE));
    
    camel_dir = g_strdup_printf ("%s/mail", evolution_dir);
    camel_session_construct (session, camel_dir);
    
    /* The shell will tell us to go online. */
    camel_session_set_online ((CamelSession *) session, FALSE);
    
    g_free (camel_dir);
}

gboolean
mail_session_get_interactive (void)
{
    return MAIL_SESSION (session)->interactive;
}

void
mail_session_set_interactive (gboolean interactive)
{
    MAIL_SESSION (session)->interactive = interactive;
    
    if (!interactive) {
        struct _pass_msg *pm;
        struct _user_message_msg *um;
        
        d(printf ("Gone non-interactive, checking for outstanding interactive tasks\n"));
        
        /* clear out pending password requests */
        while ((pm = (struct _pass_msg *) e_dlist_remhead (&password_list))) {
            d(printf ("Flushing password request : %s\n", pm->prompt));
            e_msgport_reply ((EMsg *) pm);
        }
        
        /* destroy the current */
        if (password_dialog) {
            d(printf ("Destroying password dialogue\n"));
            gtk_widget_destroy ((GtkWidget *) password_dialog);
        }
        
        /* same for pending user messages */
        while ((um = (struct _user_message_msg *) e_dlist_remhead (&message_list))) {
            d(printf ("Flusing message request: %s\n", um->prompt));
            e_msgport_reply((EMsg *) um);
        }
        
        /* and the current */
        if (message_dialog) {
            d(printf("Destroying message dialogue\n"));
            gtk_widget_destroy ((GtkWidget *) message_dialog);
        }
    }
}

void
mail_session_forget_passwords (BonoboUIComponent *uih, void *user_data,
                   const char *path)
{
    e_passwords_forget_passwords ();
}


void
mail_session_flush_filter_log (void)
{
    MailSession *ms = (MailSession *) session;
    
    if (ms->filter_logfile)
        fflush (ms->filter_logfile);
}