path: root/camel/camel-filter-driver.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Copyright (C) 2000 Ximian Inc.
 *  Copyright (C) 2001 Ximian Inc.
 *
 *  Authors: Michael Zucchi <notzed@ximian.com>
 *           Jeffrey Stedfast <fejj@ximian.com>
 *
 *  This program is free software; you can redistribute it and/or 
 *  modify it under the terms of the GNU General Public License as 
 *  published by the Free Software Foundation; either version 2 of the
 *  License, or (at your option) any later version.
 *
 *  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 <string.h>
#include <time.h>

#include <glib.h>

#include "camel-filter-driver.h"
#include "camel-filter-search.h"

#include "camel-exception.h"
#include "camel-service.h"
#include "camel-mime-message.h"

#include "e-util/e-sexp.h"
#include "e-util/e-memory.h"
#include "e-util/e-msgport.h"   /* for edlist */

#define d(x)

/* type of status for a log report */
enum filter_log_t {
    FILTER_LOG_NONE,
    FILTER_LOG_START,       /* start of new log entry */
    FILTER_LOG_ACTION,      /* an action performed */
    FILTER_LOG_END,         /* end of log */
};

/* list of rule nodes */
struct _filter_rule {
    struct _filter_rule *next;
    struct _filter_rule *prev;

    char *match;
    char *action;
    char *name;
};

struct _CamelFilterDriverPrivate {
    GHashTable *globals;       /* global variables */

    CamelFolder *defaultfolder; /* defualt folder */
    
    CamelFilterStatusFunc *statusfunc;  /* status callback */
    void *statusdata;       /* status callback data */
    
    /* for callback */
    CamelFilterGetFolderFunc get_folder;
    void *data;
    
    /* run-time data */
    GHashTable *folders;       /* folders that message has been copied to */
    int closed;        /* close count */
    GHashTable *forwards;      /* addresses that have been forwarded the message */
    
    gboolean terminated;       /* message processing was terminated */
    gboolean deleted;          /* message was marked for deletion */
    gboolean copied;           /* message was copied to some folder or another */
    
    CamelMimeMessage *message; /* input message */
    CamelMessageInfo *info;    /* message summary info */
    const char *uid;           /* message uid */
    CamelFolder *source;       /* message source folder */
    
    FILE *logfile;             /* log file */
    
    EDList rules;          /* list of _filter_rule structs */

    CamelException *ex;
    
    /* evaluator */
    ESExp *eval;
};

#define _PRIVATE(o) (((CamelFilterDriver *)(o))->priv)

static void camel_filter_driver_class_init (CamelFilterDriverClass *klass);
static void camel_filter_driver_init       (CamelFilterDriver *obj);
static void camel_filter_driver_finalise   (CamelObject *obj);

static void camel_filter_driver_log (CamelFilterDriver *driver, enum filter_log_t status, const char *desc, ...);

static CamelFolder *open_folder (CamelFilterDriver *d, const char *folder_url);
static int close_folders (CamelFilterDriver *d);

static ESExpResult *do_delete (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *);
static ESExpResult *mark_forward (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *);
static ESExpResult *do_copy (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *);
static ESExpResult *do_move (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *);
static ESExpResult *do_stop (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *);
static ESExpResult *do_colour (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *);
static ESExpResult *do_score (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *);
static ESExpResult *do_flag (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *);

/* these are our filter actions - each must have a callback */
static struct {
    char *name;
    ESExpFunc *func;
    int type;       /* set to 1 if a function can perform shortcut evaluation, or
                   doesn't execute everything, 0 otherwise */
} symbols[] = {
    { "delete",          (ESExpFunc *) do_delete,    0 },
    { "forward-to",      (ESExpFunc *) mark_forward, 0 },
    { "copy-to",         (ESExpFunc *) do_copy,      0 },
    { "move-to",         (ESExpFunc *) do_move,      0 },
    { "stop",            (ESExpFunc *) do_stop,      0 },
    { "set-colour",      (ESExpFunc *) do_colour,    0 },
    { "set-score",       (ESExpFunc *) do_score,     0 },
    { "set-system-flag", (ESExpFunc *) do_flag,      0 }
};

static CamelObjectClass *camel_filter_driver_parent;

guint
camel_filter_driver_get_type (void)
{
    static CamelType type = CAMEL_INVALID_TYPE;

    if (type == CAMEL_INVALID_TYPE) {
        type = camel_type_register(CAMEL_OBJECT_TYPE, "CamelFilterDriver",
                       sizeof(CamelFilterDriver),
                       sizeof(CamelFilterDriverClass),
                       (CamelObjectClassInitFunc)camel_filter_driver_class_init,
                       NULL,
                       (CamelObjectInitFunc)camel_filter_driver_init,
                       (CamelObjectFinalizeFunc)camel_filter_driver_finalise);
    }
    
    return type;
}

static void
camel_filter_driver_class_init (CamelFilterDriverClass *klass)
{
    /*CamelObjectClass *object_class = (CamelObjectClass *) klass;*/

    camel_filter_driver_parent = camel_type_get_global_classfuncs(camel_object_get_type());
}

static void
camel_filter_driver_init (CamelFilterDriver *obj)
{
    struct _CamelFilterDriverPrivate *p;
    int i;
    
    p = _PRIVATE (obj) = g_malloc0 (sizeof (*p));

    e_dlist_init(&p->rules);

    p->eval = e_sexp_new ();
    /* Load in builtin symbols */
    for (i = 0; i < sizeof (symbols) / sizeof (symbols[0]); i++) {
        if (symbols[i].type == 1) {
            e_sexp_add_ifunction (p->eval, 0, symbols[i].name, (ESExpIFunc *)symbols[i].func, obj);
        } else {
            e_sexp_add_function (p->eval, 0, symbols[i].name, symbols[i].func, obj);
        }
    }
    
    p->globals = g_hash_table_new (g_str_hash, g_str_equal);
    
    p->folders = g_hash_table_new (g_str_hash, g_str_equal);
}

static void
free_hash_strings (void *key, void *value, void *data)
{
    g_free (key);
    g_free (value);
}

static void
camel_filter_driver_finalise (CamelObject *obj)
{
    CamelFilterDriver *driver = (CamelFilterDriver *) obj;
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);    
    struct _filter_rule *node;

    /* close all folders that were opened for appending */
    close_folders (driver);
    g_hash_table_destroy (p->folders);
    
    g_hash_table_foreach (p->globals, free_hash_strings, driver);
    g_hash_table_destroy (p->globals);

    e_sexp_unref(p->eval);
    
    if (p->defaultfolder) {
        camel_folder_thaw (p->defaultfolder);
        camel_object_unref (CAMEL_OBJECT (p->defaultfolder));
    }

    while ((node = (struct _filter_rule *)e_dlist_remhead(&p->rules))) {
        g_free(node->match);
        g_free(node->action);
        g_free(node->name);
        g_free(node);
    }
    
    g_free (p);
}

/**
 * camel_filter_driver_new:
 * @system: path to system rules
 * @user: path to user rules
 * @get_folder: function to call to fetch folders
 *
 * Create a new CamelFilterDriver object.
 * 
 * Return value: A new CamelFilterDriver widget.
 **/
CamelFilterDriver *
camel_filter_driver_new (CamelFilterGetFolderFunc get_folder, void *data)
{
    CamelFilterDriver *new;
    struct _CamelFilterDriverPrivate *p;
    
    new = CAMEL_FILTER_DRIVER (camel_object_new(camel_filter_driver_get_type ()));
    p = _PRIVATE (new);
    
    p->get_folder = get_folder;
    p->data = data;
    
    return new;
}

void
camel_filter_driver_set_logfile (CamelFilterDriver *d, FILE *logfile)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (d);
    
    p->logfile = logfile;
}

void
camel_filter_driver_set_status_func (CamelFilterDriver *d, CamelFilterStatusFunc *func, void *data)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (d);
    
    p->statusfunc = func;
    p->statusdata = data;
}

void
camel_filter_driver_set_default_folder (CamelFilterDriver *d, CamelFolder *def)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (d);
    
    if (p->defaultfolder) {
        camel_folder_thaw (p->defaultfolder);
        camel_object_unref (CAMEL_OBJECT (p->defaultfolder));
    }
    
    p->defaultfolder = def;
    
    if (p->defaultfolder) {
        camel_folder_freeze (p->defaultfolder);
        camel_object_ref (CAMEL_OBJECT (p->defaultfolder));
    }
}

void
camel_filter_driver_add_rule(CamelFilterDriver *d, const char *name, const char *match, const char *action)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (d);
    struct _filter_rule *node;

    node = g_malloc(sizeof(*node));
    node->match = g_strdup(match);
    node->action = g_strdup(action);
    node->name = g_strdup(name);
    e_dlist_addtail(&p->rules, (EDListNode *)node);
}

static void
report_status (CamelFilterDriver *driver, enum camel_filter_status_t status, int pc, const char *desc, ...)
{
    /* call user-defined status report function */
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    va_list ap;
    char *str;
    
    if (p->statusfunc) {
        va_start (ap, desc);
        str = g_strdup_vprintf (desc, ap);
        p->statusfunc (driver, status, pc, str, p->statusdata);
        g_free (str);
    }
}


#if 0
void
camel_filter_driver_set_global (CamelFilterDriver *d, const char *name, const char *value)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (d);
    char *oldkey, *oldvalue;
    
    if (g_hash_table_lookup_extended (p->globals, name, (void *)&oldkey, (void *)&oldvalue)) {
        g_free (oldvalue);
        g_hash_table_insert (p->globals, oldkey, g_strdup (value));
    } else {
        g_hash_table_insert (p->globals, g_strdup (name), g_strdup (value));
    }
}
#endif

static ESExpResult *
do_delete (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *driver)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    
    d(fprintf (stderr, "doing delete\n"));
    p->deleted = TRUE;
    camel_filter_driver_log (driver, FILTER_LOG_ACTION, "Delete");
    
    return NULL;
}

static ESExpResult *
mark_forward (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *driver)
{
    /*struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);*/
    
    d(fprintf (stderr, "marking message for forwarding\n"));
    /* FIXME: do stuff here */
    camel_filter_driver_log (driver, FILTER_LOG_ACTION, "Forward");
    
    return NULL;
}

static ESExpResult *
do_copy (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *driver)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    int i;
    
    d(fprintf (stderr, "copying message...\n"));
    
    for (i = 0; i < argc; i++) {
        if (argv[i]->type == ESEXP_RES_STRING) {
            /* open folders we intent to copy to */
            char *folder = argv[i]->value.string;
            char *service_url;
            CamelFolder *outbox;
            
            outbox = open_folder (driver, folder);
            if (!outbox)
                break;
            
            p->copied = TRUE;
            if (p->uid && p->source && camel_folder_has_summary_capability (p->source)) {
                GPtrArray *uids;
                
                uids = g_ptr_array_new ();
                g_ptr_array_add (uids, (char *) p->uid);
                camel_folder_copy_messages_to (p->source, uids, outbox, p->ex);
                g_ptr_array_free (uids, TRUE);
            } else
                camel_folder_append_message (outbox, p->message, p->info, p->ex);
            
            service_url = camel_service_get_url (CAMEL_SERVICE (camel_folder_get_parent_store (outbox)));
            camel_filter_driver_log (driver, FILTER_LOG_ACTION, "Copy to folder %s",
                         service_url);
            g_free (service_url);
        }
    }
    
    return NULL;
}

static ESExpResult *
do_move (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *driver)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    int i;
    
    d(fprintf (stderr, "moving message...\n"));
    
    for (i = 0; i < argc; i++) {
        if (argv[i]->type == ESEXP_RES_STRING) {
            /* open folders we intent to move to */
            char *folder = argv[i]->value.string;
            char *service_url;
            CamelFolder *outbox;
            
            outbox = open_folder (driver, folder);
            if (!outbox)
                break;
            
            p->copied = TRUE;
            p->deleted = TRUE;  /* a 'move' is a copy & delete */
            
            if (p->uid && p->source && camel_folder_has_summary_capability (p->source)) {
                GPtrArray *uids;
                
                uids = g_ptr_array_new ();
                g_ptr_array_add (uids, (char *) p->uid);
                camel_folder_copy_messages_to (p->source, uids, outbox, p->ex);
                g_ptr_array_free (uids, TRUE);
            } else
                camel_folder_append_message (outbox, p->message, p->info, p->ex);
            
            service_url = camel_service_get_url (CAMEL_SERVICE (camel_folder_get_parent_store (outbox)));
            camel_filter_driver_log (driver, FILTER_LOG_ACTION, "Move to folder %s",
                         service_url);
            g_free (service_url);
        }
    }
    
    return NULL;
}

static ESExpResult *
do_stop (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *driver)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    
    camel_filter_driver_log (driver, FILTER_LOG_ACTION, "Stopped processing");
    d(fprintf (stderr, "terminating message processing\n"));
    p->terminated = TRUE;
    
    return NULL;
}

static ESExpResult *
do_colour (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *driver)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    
    d(fprintf (stderr, "setting colour tag\n"));
    if (argc > 0 && argv[0]->type == ESEXP_RES_STRING) {
        camel_tag_set (&p->info->user_tags, "colour", argv[0]->value.string);
        camel_filter_driver_log (driver, FILTER_LOG_ACTION, "Set colour to %s", argv[0]->value.string);
    }
    
    return NULL;
}

static ESExpResult *
do_score (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *driver)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    
    d(fprintf (stderr, "setting score tag\n"));
    if (argc > 0 && argv[0]->type == ESEXP_RES_INT) {
        char *value;
        
        value = g_strdup_printf ("%d", argv[0]->value.number);
        camel_tag_set (&p->info->user_tags, "score", value);
        camel_filter_driver_log (driver, FILTER_LOG_ACTION, "Set score to %d", argv[0]->value.number);
        g_free (value);
    }
    
    return NULL;
}

static ESExpResult *
do_flag (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFilterDriver *driver)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    
    d(fprintf (stderr, "setting flag\n"));
    if (argc == 1 && argv[0]->type == ESEXP_RES_STRING) {
        p->info->flags |= camel_system_flag (argv[0]->value.string) | CAMEL_MESSAGE_FOLDER_FLAGGED;
        camel_filter_driver_log (driver, FILTER_LOG_ACTION, "Set %s flag", argv[0]->value.string);
    }
    
    return NULL;
}

static CamelFolder *
open_folder (CamelFilterDriver *driver, const char *folder_url)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    CamelFolder *camelfolder;
    CamelException ex;
    
    /* we have a lookup table of currently open folders */
    camelfolder = g_hash_table_lookup (p->folders, folder_url);
    if (camelfolder)
        return camelfolder;
    
    camel_exception_init (&ex);
    camelfolder = p->get_folder (driver, folder_url, p->data, &ex);
    camel_exception_clear (&ex);
    
    if (camelfolder) {
        g_hash_table_insert (p->folders, g_strdup (folder_url), camelfolder);
        camel_folder_freeze (camelfolder);
    }
    
    return camelfolder;
}

static void
close_folder (void *key, void *value, void *data)
{   
    CamelFolder *folder = value;
    CamelFilterDriver *driver = data;
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    
    p->closed++;

    g_free (key);
    camel_folder_sync (folder, FALSE, p->ex);
    camel_folder_thaw (folder);
    camel_object_unref (CAMEL_OBJECT (folder));

    report_status(driver, CAMEL_FILTER_STATUS_PROGRESS, g_hash_table_size(p->folders)* 100 / p->closed, _("Syncing folders"));
}

/* flush/close all folders */
static int
close_folders (CamelFilterDriver *driver)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);

    report_status(driver, CAMEL_FILTER_STATUS_PROGRESS, 0, _("Syncing folders"));

    p->closed = 0;
    g_hash_table_foreach (p->folders, close_folder, driver);
    g_hash_table_destroy (p->folders);
    p->folders = g_hash_table_new (g_str_hash, g_str_equal);
    
    /* FIXME: status from driver */
    return 0;
}

#if 0
static void
free_key (gpointer key, gpointer value, gpointer user_data)
{
    g_free (key);
}
#endif


static void
camel_filter_driver_log (CamelFilterDriver *driver, enum filter_log_t status, const char *desc, ...)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    
    if (p->logfile) {
        char *str = NULL;
        
        if (desc) {
            va_list ap;
            
            va_start (ap, desc);
            str = g_strdup_vprintf (desc, ap);
        }
        
        switch (status) {
        case FILTER_LOG_START: {
            /* write log header */
            const char *subject = NULL;
            char *fromstr;
            const CamelInternetAddress *from;
            char date[50];
            time_t t;

            /* FIXME: does this need locking?  Probably */

            from = camel_mime_message_get_from (p->message);
            fromstr = camel_address_format((CamelAddress *)from);
            subject = camel_mime_message_get_subject (p->message);
            
            time (&t);
            strftime (date, 49, "%a, %d %b %Y %H:%M:%S", localtime (&t));
            fprintf (p->logfile, "Applied filter \"%s\" to message from %s - \"%s\" at %s\n",
                 str, fromstr ? fromstr : "unknown", subject ? subject : "", date);
            g_free(fromstr);
            break;
        }
        case FILTER_LOG_ACTION:
            fprintf (p->logfile, "Action: %s\n", str);
            break;
        case FILTER_LOG_END:
            fprintf (p->logfile, "\n");
            break;
        default:
            /* nothing else is loggable */
            break;
        }
        
        g_free (str);
    }
}


/**
 * camel_filter_driver_filter_mbox:
 * @driver: CamelFilterDriver
 * @mbox: mbox filename to be filtered
 * @ex: exception
 *
 * Filters an mbox file based on rules defined in the FilterDriver
 * object. Is more efficient as it doesn't need to open the folder
 * through Camel directly.
 *
 * Returns -1 if errors were encountered during filtering,
 * otherwise returns 0.
 *
 **/
int
camel_filter_driver_filter_mbox (CamelFilterDriver *driver, const char *mbox, const char *original_source_url, CamelException *ex)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    CamelMimeParser *mp = NULL;
    char *source_url = NULL;
    int fd = -1;
    int i = 0;
    struct stat st;
    int status;
    
    fd = open (mbox, O_RDONLY);
    if (fd == -1) {
        camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Unable to open spool folder"));
        goto fail;
    }
    /* to get the filesize */
    fstat (fd, &st);
    
    mp = camel_mime_parser_new ();
    camel_mime_parser_scan_from (mp, TRUE);
    if (camel_mime_parser_init_with_fd (mp, fd) == -1) {
        camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Unable to process spool folder"));
        goto fail;
    }
    fd = -1;
    
    source_url = g_strdup_printf ("file://%s", mbox);
    
    while (camel_mime_parser_step (mp, 0, 0) == HSCAN_FROM) {
        CamelMimeMessage *msg;
        int pc = 0;
        
        if (st.st_size > 0)
            pc = (int)(100.0 * ((double)camel_mime_parser_tell (mp) / (double)st.st_size));
        
        report_status (driver, CAMEL_FILTER_STATUS_START, pc, _("Getting message %d (%d%%)"), i, pc);
        
        msg = camel_mime_message_new ();
        if (camel_mime_part_construct_from_parser (CAMEL_MIME_PART (msg), mp) == -1) {
            report_status (driver, CAMEL_FILTER_STATUS_END, 100, _("Failed on message %d"), i);
            camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot open message"));
            camel_object_unref (CAMEL_OBJECT (msg));
            goto fail;
        }
        
        status = camel_filter_driver_filter_message (driver, msg, NULL, NULL, NULL, source_url, 
                                 original_source_url ? original_source_url : source_url, ex);
        camel_object_unref (CAMEL_OBJECT (msg));
        if (camel_exception_is_set (ex) || status == -1) {
            report_status (driver, CAMEL_FILTER_STATUS_END, 100, _("Failed on message %d"), i);
            goto fail;
        }
        
        i++;
        
        /* skip over the FROM_END state */
        camel_mime_parser_step (mp, 0, 0);
    }
    
    if (p->defaultfolder) {
        report_status(driver, CAMEL_FILTER_STATUS_PROGRESS, 100, _("Syncing folder"));
        camel_folder_sync(p->defaultfolder, FALSE, ex);
    }
    
    report_status (driver, CAMEL_FILTER_STATUS_END, 100, _("Complete"));
    
    return 0;
    
fail:
    g_free (source_url);
    if (fd != -1)
        close (fd);
    if (mp)
        camel_object_unref (CAMEL_OBJECT (mp));
    
    return -1;
}


/**
 * camel_filter_driver_filter_folder:
 * @driver: CamelFilterDriver
 * @folder: CamelFolder to be filtered
 * @uids: message uids to be filtered or NULL (as a shortcut to filter all messages)
 * @remove: TRUE to mark filtered messages as deleted
 * @ex: exception
 *
 * Filters a folder based on rules defined in the FilterDriver
 * object.
 *
 * Returns -1 if errors were encountered during filtering,
 * otherwise returns 0.
 *
 **/
int
camel_filter_driver_filter_folder (CamelFilterDriver *driver, CamelFolder *folder,
                   GPtrArray *uids, gboolean remove, CamelException *ex)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    int i;
    int freeuids = FALSE;
    CamelMimeMessage *message;
    CamelMessageInfo *info;
    char *source_url, *service_url;
    const char *folder_name;
    int status = 0;
    int need_sep = 0;
    
    service_url = camel_service_get_url (CAMEL_SERVICE (camel_folder_get_parent_store (folder)));
    folder_name = camel_folder_get_full_name (folder);
    
    /* Add a separator unless the first char of folder_name or the last char of service_url is '/' */
    need_sep = (folder_name && *folder_name != '/');
    if (service_url && *service_url && !need_sep) {
        need_sep = (service_url[strlen (service_url)-1] != '/');
    }
    source_url = g_strdup_printf ("%s%s%s",
                      service_url,
                      need_sep ? "/" : "",
                      folder_name);
    g_free (service_url);
    
    if (uids == NULL) {
        uids = camel_folder_get_uids (folder);
        freeuids = TRUE;
    }
    
    for (i = 0; i < uids->len; i++) {
        int pc = (100 * i)/uids->len;
        
        report_status (driver, CAMEL_FILTER_STATUS_START, pc, _("Getting message %d of %d"), i+1,
                   uids->len);
        
        message = camel_folder_get_message (folder, uids->pdata[i], ex);
        if (!message || camel_exception_is_set (ex)) {
            report_status (driver, CAMEL_FILTER_STATUS_END, 100, _("Failed at message %d of %d"),
                       i+1, uids->len);
            status = -1;
            break;
        }
        
        if (camel_folder_has_summary_capability (folder))
            info = camel_folder_get_message_info (folder, uids->pdata[i]);
        else
            info = NULL;
        
        status = camel_filter_driver_filter_message (driver, message, info, uids->pdata[i],
                                 folder, source_url, source_url, ex);
        
        if (camel_folder_has_summary_capability (folder))
            camel_folder_free_message_info (folder, info);
        
        if (camel_exception_is_set (ex) || status == -1) {
            report_status (driver, CAMEL_FILTER_STATUS_END, 100, _("Failed at message %d of %d"),
                       i+1, uids->len);
            status = -1;
            break;
        }
        
        if (remove)
            camel_folder_set_message_flags (folder, uids->pdata[i],
                            CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_SEEN,
                            CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_SEEN);
        
        camel_object_unref (CAMEL_OBJECT (message));
    }
    
    if (freeuids)
        camel_folder_free_uids (folder, uids);
    
    if (p->defaultfolder) {
        report_status (driver, CAMEL_FILTER_STATUS_PROGRESS, 100, _("Syncing folder"));
        camel_folder_sync (p->defaultfolder, FALSE, ex);
    }
    
    if (i == uids->len)
        report_status (driver, CAMEL_FILTER_STATUS_END, 100, _("Complete"));
    
    g_free (source_url);
    
    return status;
}


/**
 * camel_filter_driver_filter_message:
 * @driver: CamelFilterDriver
 * @message: message to filter
 * @info: message info or NULL
 * @uid: message uid or NULL
 * @source: source folder or NULL
 * @source_url: url of source folder or NULL
 * @original_source_url: url of original source folder (pre-movemail) or NULL
 * @ex: exception
 *
 * Filters a message based on rules defined in the FilterDriver
 * object. If the source folder (@source) and the uid (@uid) are
 * provided, the filter will operate on the CamelFolder (which in
 * certain cases is more efficient than using the default
 * camel_folder_append_message() function).
 *
 * Returns -1 if errors were encountered during filtering,
 * otherwise returns 0.
 *
 **/
int
camel_filter_driver_filter_message (CamelFilterDriver *driver, CamelMimeMessage *message,
                    CamelMessageInfo *info, const char *uid,
                    CamelFolder *source, const char *source_url,
                    const char *original_source_url,
                    CamelException *ex)
{
    struct _CamelFilterDriverPrivate *p = _PRIVATE (driver);
    ESExpResult *r;
    struct _filter_rule *node;
    gboolean freeinfo = FALSE;
    gboolean filtered = FALSE;
    
    if (info == NULL) {
        struct _header_raw *h = CAMEL_MIME_PART (message)->headers;
        
        info = camel_message_info_new_from_header (h);
        freeinfo = TRUE;
    } else {
        if (info->flags & CAMEL_MESSAGE_DELETED)
            return 0;
    }
    
    p->ex = ex;
    p->terminated = FALSE;
    p->deleted = FALSE;
    p->copied = FALSE;
    p->message = message;
    p->info = info;
    p->uid = uid;
    p->source = source;
    
    if (original_source_url && camel_mime_message_get_source (message) == NULL)
        camel_mime_message_set_source (message, original_source_url);
    
    node = (struct _filter_rule *)p->rules.head;
    while (node->next) {
        d(fprintf (stderr, "applying rule %s\naction %s\n", node->match, node->action));
        
        if (camel_filter_search_match (p->message, p->info, 
                           original_source_url ? original_source_url : source_url,
                           node->match, p->ex)) {
            filtered = TRUE;
            camel_filter_driver_log (driver, FILTER_LOG_START, node->name);
            
            /* perform necessary filtering actions */
            e_sexp_input_text (p->eval, node->action, strlen (node->action));
            if (e_sexp_parse (p->eval) == -1) {
                camel_exception_setv (ex, 1, _("Error parsing filter: %s: %s"),
                              e_sexp_error (p->eval), node->action);
                goto error;
            }
            r = e_sexp_eval (p->eval);
            if (r == NULL) {
                camel_exception_setv (ex, 1, _("Error executing filter: %s: %s"),
                              e_sexp_error (p->eval), node->action);
                goto error;
            }
            e_sexp_result_free (p->eval, r);
            if (p->terminated)
                break;
        }
        
        node = node->next;
    }
    
    /* *Now* we can set the DELETED flag... */
    if (p->deleted)
        info->flags = info->flags | CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_SEEN | CAMEL_MESSAGE_FOLDER_FLAGGED;
    
    /* Logic: if !Moved and there exists a default folder... */
    if (!(p->copied && p->deleted) && p->defaultfolder) {
        /* copy it to the default inbox */
        filtered = TRUE;
        camel_filter_driver_log (driver, FILTER_LOG_ACTION, "Copy to default folder");
        if (p->uid && p->source && camel_folder_has_summary_capability (p->source)) {
            GPtrArray *uids;
            
            uids = g_ptr_array_new ();
            g_ptr_array_add (uids, (char *) p->uid);
            camel_folder_copy_messages_to (p->source, uids, p->defaultfolder, p->ex);
            g_ptr_array_free (uids, TRUE);
        } else
            camel_folder_append_message (p->defaultfolder, p->message, p->info, p->ex);
    }
    
    if (freeinfo)
        camel_message_info_free (info);
    
    return 0;
    
error:  
    if (filtered)
        camel_filter_driver_log (driver, FILTER_LOG_END, NULL);
    
    if (freeinfo)
        camel_message_info_free (info);
    
    return -1;
}