Sylpheed

/*

 * LibSylph -- E-Mail client library

 * Copyright (C) 1999-2006 Hiroyuki Yamamoto

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#ifdef HAVE_CONFIG_H

#  include "config.h"

#endif

#include "defs.h"

#include <glib.h>

#include <glib/gi18n.h>

#include <string.h>

#include <strings.h>

#include <stdlib.h>

#include <sys/types.h>

#if HAVE_REGEX_H

#  include <regex.h>

#endif

#include <time.h>

#include "filter.h"

#include "procmsg.h"

#include "procheader.h"

#include "folder.h"

#include "utils.h"

#include "xml.h"

#include "prefs.h"

#include "prefs_common.h"

#include "prefs_account.h"

#include "account.h"

typedef enum

{

        FLT_O_CONTAIN        = 1 << 0,

        FLT_O_CASE_SENS        = 1 << 1,

        FLT_O_REGEX        = 1 << 2

} FilterOldFlag;

static gboolean filter_match_cond        (FilterCond        *cond,

                                         MsgInfo        *msginfo,

                                         GSList                *hlist,

                                         FilterInfo        *fltinfo);

static gboolean filter_match_header_cond(FilterCond        *cond,

                                         GSList                *hlist);

static void filter_cond_free                (FilterCond        *cond);

static void filter_action_free                (FilterAction        *action);

gint filter_apply(GSList *fltlist, const gchar *file, FilterInfo *fltinfo)

{

        MsgInfo *msginfo;

        gint ret = 0;

        g_return_val_if_fail(file != NULL, -1);

        g_return_val_if_fail(fltinfo != NULL, -1);

        if (!fltlist) return 0;

        msginfo = procheader_parse_file(file, fltinfo->flags, FALSE);

        if (!msginfo) return 0;

        msginfo->file_path = g_strdup(file);

        ret = filter_apply_msginfo(fltlist, msginfo, fltinfo);

        procmsg_msginfo_free(msginfo);

        return ret;

}

gint filter_apply_msginfo(GSList *fltlist, MsgInfo *msginfo,

                          FilterInfo *fltinfo)

{

        gchar *file;

        GSList *hlist, *cur;

        FilterRule *rule;

        gint ret = 0;

        g_return_val_if_fail(msginfo != NULL, -1);

        g_return_val_if_fail(fltinfo != NULL, -1);

        if (!fltlist) return 0;

        file = procmsg_get_message_file(msginfo);

        hlist = procheader_get_header_list_from_file(file);

        if (!hlist) {

                g_free(file);

                return 0;

        }

        for (cur = fltlist; cur != NULL; cur = cur->next) {

                rule = (FilterRule *)cur->data;

                if (!rule->enabled) continue;

                if (filter_match_rule(rule, msginfo, hlist, fltinfo)) {

                        ret = filter_action_exec(rule, msginfo, file, fltinfo);

                        if (ret < 0) {

                                g_warning("filter_action_exec() returned error\n");

                                break;

                        }

                        if (fltinfo->drop_done == TRUE ||

                            fltinfo->actions[FLT_ACTION_STOP_EVAL] == TRUE)

                                break;

                }

        }

        procheader_header_list_destroy(hlist);

        g_free(file);

        return ret;

}

gint filter_action_exec(FilterRule *rule, MsgInfo *msginfo, const gchar *file,

                        FilterInfo *fltinfo)

{

        FolderItem *dest_folder = NULL;

        FilterAction *action;

        GSList *cur;

        gchar *cmdline;

        gboolean copy_to_self = FALSE;

        g_return_val_if_fail(rule != NULL, -1);

        g_return_val_if_fail(msginfo != NULL, -1);

        g_return_val_if_fail(file != NULL, -1);

        g_return_val_if_fail(fltinfo != NULL, -1);

        for (cur = rule->action_list; cur != NULL; cur = cur->next) {

                action = (FilterAction *)cur->data;

                switch (action->type) {

                case FLT_ACTION_MARK:

                        debug_print("filter_action_exec(): mark\n");

                        MSG_SET_PERM_FLAGS(fltinfo->flags, MSG_MARKED);

                        fltinfo->actions[action->type] = TRUE;

                        break;

                case FLT_ACTION_COLOR_LABEL:

                        debug_print("filter_action_exec(): color label: %d\n",

                                    action->int_value);

                        MSG_UNSET_PERM_FLAGS(fltinfo->flags,

                                             MSG_CLABEL_FLAG_MASK);

                        MSG_SET_COLORLABEL_VALUE(fltinfo->flags,

                                                 action->int_value);

                        fltinfo->actions[action->type] = TRUE;

                        break;

                case FLT_ACTION_MARK_READ:

                        debug_print("filter_action_exec(): mark as read\n");

                        if (msginfo->folder) {

                                if (MSG_IS_NEW(fltinfo->flags))

                                        msginfo->folder->new--;

                                if (MSG_IS_UNREAD(fltinfo->flags))

                                        msginfo->folder->unread--;

                        }

                        MSG_UNSET_PERM_FLAGS(fltinfo->flags, MSG_NEW|MSG_UNREAD);

                        fltinfo->actions[action->type] = TRUE;

                        break;

                case FLT_ACTION_EXEC:

                        cmdline = g_strconcat(action->str_value, " \"", file,

                                              "\"", NULL);

                        execute_command_line(cmdline, FALSE);

                        g_free(cmdline);

                        fltinfo->actions[action->type] = TRUE;

                        break;

                case FLT_ACTION_EXEC_ASYNC:

                        cmdline = g_strconcat(action->str_value, " \"", file,

                                              "\"", NULL);

                        execute_command_line(cmdline, TRUE);

                        g_free(cmdline);

                        fltinfo->actions[action->type] = TRUE;

                        break;

                default:

                        break;

                }

        }

        for (cur = rule->action_list; cur != NULL; cur = cur->next) {

                action = (FilterAction *)cur->data;

                switch (action->type) {

                case FLT_ACTION_MOVE:

                case FLT_ACTION_COPY:

                        dest_folder = folder_find_item_from_identifier

                                (action->str_value);

                        if (!dest_folder) {

                                g_warning("dest folder '%s' not found\n",

                                          action->str_value);

                                return -1;

                        }

                        debug_print("filter_action_exec(): %s: dest_folder = %s\n",

                                    action->type == FLT_ACTION_COPY ?

                                    "copy" : "move", action->str_value);

                        if (msginfo->folder) {

                                gint val;

                                /* local filtering */

                                if (msginfo->folder == dest_folder)

                                        copy_to_self = TRUE;

                                else {

                                        if (action->type == FLT_ACTION_COPY) {

                                                val = folder_item_copy_msg

                                                        (dest_folder, msginfo);

                                                if (val == -1)

                                                        return -1;

                                        }

                                        fltinfo->actions[action->type] = TRUE;

                                }

                        } else {

                                if (folder_item_add_msg(dest_folder, file,

                                                        &fltinfo->flags,

                                                        FALSE) < 0)

                                        return -1;

                                fltinfo->actions[action->type] = TRUE;

                        }

                        fltinfo->dest_list = g_slist_append(fltinfo->dest_list,

                                                            dest_folder);

                        if (action->type == FLT_ACTION_MOVE) {

                                fltinfo->move_dest = dest_folder;

                                fltinfo->drop_done = TRUE;

                        }

                        break;

                default:

                        break;

                }

        }

        if (fltinfo->drop_done == TRUE)

                return 0;

        for (cur = rule->action_list; cur != NULL; cur = cur->next) {

                action = (FilterAction *)cur->data;

                switch (action->type) {

                case FLT_ACTION_NOT_RECEIVE:

                        debug_print("filter_action_exec(): don't receive\n");

                        fltinfo->drop_done = TRUE;

                        fltinfo->actions[action->type] = TRUE;

                        return 0;

                case FLT_ACTION_DELETE:

                        debug_print("filter_action_exec(): delete\n");

                        if (msginfo->folder) {

                                /* local filtering */

                                if (copy_to_self == FALSE)

                                        fltinfo->actions[action->type] = TRUE;

                        } else

                                fltinfo->actions[action->type] = TRUE;

                        fltinfo->drop_done = TRUE;

                        return 0;

                case FLT_ACTION_STOP_EVAL:

                        debug_print("filter_action_exec(): stop evaluation\n");

                        fltinfo->actions[action->type] = TRUE;

                        return 0;

                default:

                        break;

                }

        }

        return 0;

}

static gboolean strmatch_regex(const gchar *haystack, const gchar *needle)

{

#if HAVE_REGEX_H && HAVE_REGCOMP

        gint ret = 0;

        regex_t preg;

        regmatch_t pmatch[1];

        ret = regcomp(&preg, needle, REG_EXTENDED|REG_ICASE);

        if (ret != 0) return FALSE;

        ret = regexec(&preg, haystack, 1, pmatch, 0);

        regfree(&preg);

        if (ret == REG_NOMATCH) return FALSE;

        if (pmatch[0].rm_so != -1)

                return TRUE;

        else

#endif

                return FALSE;

}

gboolean filter_match_rule(FilterRule *rule, MsgInfo *msginfo, GSList *hlist,

                           FilterInfo *fltinfo)

{

        FilterCond *cond;

        GSList *cur;

        gboolean matched;

        g_return_val_if_fail(rule->cond_list != NULL, FALSE);

        switch (rule->timing) {

        case FLT_TIMING_ANY:

                break;

        case FLT_TIMING_ON_RECEIVE:

                if (msginfo->folder != NULL)

                        return FALSE;

                break;

        case FLT_TIMING_MANUAL:

                if (msginfo->folder == NULL)

                        return FALSE;

                break;

        default:

                break;

        }

        if (rule->bool_op == FLT_AND) {

                for (cur = rule->cond_list; cur != NULL; cur = cur->next) {

                        cond = (FilterCond *)cur->data;

                        matched = filter_match_cond(cond, msginfo, hlist,

                                                    fltinfo);

                        if (matched == FALSE)

                                return FALSE;

                }

                return TRUE;

        } else if (rule->bool_op == FLT_OR) {

                for (cur = rule->cond_list; cur != NULL; cur = cur->next) {

                        cond = (FilterCond *)cur->data;

                        matched = filter_match_cond(cond, msginfo, hlist,

                                                    fltinfo);

                        if (matched == TRUE)

                                return TRUE;

                }

                return FALSE;

        }

        return FALSE;

}

static gboolean filter_match_cond(FilterCond *cond, MsgInfo *msginfo,

                                  GSList *hlist, FilterInfo *fltinfo)

{

        gboolean matched = FALSE;

        gchar *file;

        gchar *cmdline;

        PrefsAccount *cond_ac;

        switch (cond->type) {

        case FLT_COND_HEADER:

        case FLT_COND_ANY_HEADER:

        case FLT_COND_TO_OR_CC:

                return filter_match_header_cond(cond, hlist);

        case FLT_COND_BODY:

                matched = procmime_find_string(msginfo, cond->str_value,

                                               cond->match_func);

                break;

        case FLT_COND_CMD_TEST:

                file = procmsg_get_message_file(msginfo);

                cmdline = g_strconcat(cond->str_value, " \"", file, "\"", NULL);

                matched = (execute_command_line(cmdline, FALSE) == 0);

                g_free(cmdline);

                g_free(file);

                break;

        case FLT_COND_SIZE_GREATER:

                matched = (msginfo->size > cond->int_value * 1024);

                break;

        case FLT_COND_AGE_GREATER:

                matched = (time(NULL) - msginfo->date_t >

                                cond->int_value * 24 * 60 * 60);

                break;

        case FLT_COND_UNREAD:

                matched = MSG_IS_UNREAD(msginfo->flags);

                break;

        case FLT_COND_MARK:

                matched = MSG_IS_MARKED(msginfo->flags);

                break;

        case FLT_COND_COLOR_LABEL:

                matched = (MSG_GET_COLORLABEL_VALUE(msginfo->flags) != 0);

                break;

        case FLT_COND_MIME:

                matched = MSG_IS_MIME(msginfo->flags);

                break;

        case FLT_COND_ACCOUNT:

                cond_ac = account_find_from_id(cond->int_value);

                matched = (cond_ac != NULL && cond_ac == fltinfo->account);

                break;

        default:

                g_warning("filter_match_cond(): unknown condition: %d\n",

                          cond->type);

                return FALSE;

        }

        if (FLT_IS_NOT_MATCH(cond->match_flag))

                matched = !matched;

        return matched;

}

static gboolean filter_match_header_cond(FilterCond *cond, GSList *hlist)

{

        gboolean matched = FALSE;

        GSList *cur;

        Header *header;

        for (cur = hlist; cur != NULL; cur = cur->next) {

                header = (Header *)cur->data;

                switch (cond->type) {

                case FLT_COND_HEADER:

                        if (!g_ascii_strcasecmp

                                (header->name, cond->header_name)) {

                                if (!cond->str_value ||

                                    cond->match_func(header->body,

                                                     cond->str_value))

                                        matched = TRUE;

                        }

                        break;

                case FLT_COND_ANY_HEADER:

                        if (!cond->str_value ||

                            cond->match_func(header->body, cond->str_value))

                                matched = TRUE;

                        break;

                case FLT_COND_TO_OR_CC:

                        if (!g_ascii_strcasecmp(header->name, "To") ||

                            !g_ascii_strcasecmp(header->name, "Cc")) {

                                if (!cond->str_value ||

                                    cond->match_func(header->body,

                                                     cond->str_value))

                                        matched = TRUE;

                        }

                        break;

                default:

                        break;

                }

                if (matched == TRUE)

                        break;

        }

        if (FLT_IS_NOT_MATCH(cond->match_flag))

                matched = !matched;

        return matched;

}

gboolean filter_rule_requires_full_headers(FilterRule *rule)

{

        GSList *cur;

        for (cur = rule->cond_list; cur != NULL; cur = cur->next) {

                FilterCond *cond = (FilterCond *)cur->data;

                const gchar *name = cond->header_name;

                if (cond->type == FLT_COND_HEADER && name) {

                        if (g_ascii_strcasecmp(name, "Date") != 0 &&

                            g_ascii_strcasecmp(name, "From") != 0 &&

                            g_ascii_strcasecmp(name, "To") != 0 &&

                            g_ascii_strcasecmp(name, "Newsgroups") != 0 &&

                            g_ascii_strcasecmp(name, "Subject") != 0)

                                return TRUE;

                } else if (cond->type == FLT_COND_ANY_HEADER ||

                           cond->type == FLT_COND_TO_OR_CC)

                        return TRUE;

        }

        return FALSE;

}

#define RETURN_IF_TAG_NOT_MATCH(tag_name)                        \

        if (strcmp2(xmlnode->tag->tag, tag_name) != 0) {        \

                g_warning("tag name != \"" tag_name "\"\n");        \

                filter_cond_list_free(cond_list);                \

                filter_action_list_free(cond_list);                \

                return FALSE;                                        \

        }                                                        \

#define STR_SWITCH(sw)                { const gchar *sw_str = sw;

#define STR_CASE_BEGIN(str)        if (!strcmp(sw_str, str)) {

#define STR_CASE(str)                } else if (!strcmp(sw_str, str)) {

#define STR_CASE_END                } }

static gboolean filter_xml_node_func(GNode *node, gpointer data)

{

        XMLNode *xmlnode;

        GList *list;

        const gchar *name = NULL;

        FilterTiming timing = FLT_TIMING_ANY;

        gboolean enabled = TRUE;

        FilterRule *rule;

        FilterBoolOp bool_op = FLT_OR;

        const gchar *target_folder = NULL;

        gboolean recursive = FALSE;

        GSList *cond_list = NULL;

        GSList *action_list = NULL;

        GNode *child, *cond_child, *action_child;

        GSList **fltlist = (GSList **)data;

        if (g_node_depth(node) != 2) return FALSE;

        g_return_val_if_fail(node->data != NULL, FALSE);

        xmlnode = node->data;

        RETURN_IF_TAG_NOT_MATCH("rule");

        for (list = xmlnode->tag->attr; list != NULL; list = list->next) {

                XMLAttr *attr = (XMLAttr *)list->data;

                if (!attr || !attr->name || !attr->value) continue;

                if (!strcmp(attr->name, "name"))

                        name = attr->value;

                else if (!strcmp(attr->name, "timing")) {

                        if (!strcmp(attr->value, "any"))

                                timing = FLT_TIMING_ANY;

                        else if (!strcmp(attr->value, "receive"))

                                timing = FLT_TIMING_ON_RECEIVE;

                        else if (!strcmp(attr->value, "manual"))

                                timing = FLT_TIMING_MANUAL;

                } else if (!strcmp(attr->name, "enabled")) {

                        if (!strcmp(attr->value, "true"))

                                enabled = TRUE;

                        else

                                enabled = FALSE;

                }

        }

        /* condition list */

        child = node->children;

        if (!child) {

                g_warning("<rule> must have children\n");

                return FALSE;

        }

        xmlnode = child->data;

        RETURN_IF_TAG_NOT_MATCH("condition-list");

        for (list = xmlnode->tag->attr; list != NULL; list = list->next) {

                XMLAttr *attr = (XMLAttr *)list->data;

                if (attr && attr->name && attr->value &&

                    !strcmp(attr->name, "bool")) {

                        if (!strcmp(attr->value, "or"))

                                bool_op = FLT_OR;

                        else

                                bool_op = FLT_AND;

                }

        }

        for (cond_child = child->children; cond_child != NULL;

             cond_child = cond_child->next) {

                const gchar *type = NULL;

                const gchar *name = NULL;

                const gchar *value = NULL;

                gboolean case_sens = FALSE;

                FilterCond *cond;

                FilterCondType cond_type = FLT_COND_HEADER;

                FilterMatchType match_type = FLT_CONTAIN;

                FilterMatchFlag match_flag = 0;

                xmlnode = cond_child->data;

                if (!xmlnode || !xmlnode->tag || !xmlnode->tag->tag) continue;

                for (list = xmlnode->tag->attr; list != NULL; list = list->next) {

                        XMLAttr *attr = (XMLAttr *)list->data;

                        if (!attr || !attr->name || !attr->value) continue;

                        STR_SWITCH(attr->name)

                        STR_CASE_BEGIN("type")

                                type = attr->value;

                        STR_CASE("name")

                                name = attr->value;

                        STR_CASE("case")

                                case_sens = TRUE;

                        STR_CASE("recursive")

                                if (!strcmp(attr->value, "true"))

                                        recursive = TRUE;

                                else

                                        recursive = FALSE;

                        STR_CASE_END

                }

                if (type) {

                        filter_rule_match_type_str_to_enum

                                (type, &match_type, &match_flag);

                }

                if (case_sens)

                        match_flag |= FLT_CASE_SENS;

                value = xmlnode->element;

                STR_SWITCH(xmlnode->tag->tag)

                STR_CASE_BEGIN("match-header")

                        cond_type = FLT_COND_HEADER;

                STR_CASE("match-any-header")

                        cond_type = FLT_COND_ANY_HEADER;

                STR_CASE("match-to-or-cc")

                        cond_type = FLT_COND_TO_OR_CC;

                STR_CASE("match-body-text")

                        cond_type = FLT_COND_BODY;

                STR_CASE("command-test")

                        cond_type = FLT_COND_CMD_TEST;

                STR_CASE("size")

                        cond_type = FLT_COND_SIZE_GREATER;

                STR_CASE("age")

                        cond_type = FLT_COND_AGE_GREATER;

                STR_CASE("unread")

                        cond_type = FLT_COND_UNREAD;

                STR_CASE("mark")

                        cond_type = FLT_COND_MARK;

                STR_CASE("color-label")

                        cond_type = FLT_COND_COLOR_LABEL;

                STR_CASE("mime")

                        cond_type = FLT_COND_MIME;

                STR_CASE("account-id")

                        cond_type = FLT_COND_ACCOUNT;

                STR_CASE("target-folder")

                        target_folder = value;

                        continue;

                STR_CASE_END

                cond = filter_cond_new(cond_type, match_type, match_flag,

                                       name, value);

                cond_list = g_slist_append(cond_list, cond);

        }

        /* action list */

        child = child->next;

        if (!child) {

                g_warning("<rule> must have multiple children\n");

                filter_cond_list_free(cond_list);

                return FALSE;

        }

        xmlnode = child->data;

        RETURN_IF_TAG_NOT_MATCH("action-list");

        for (action_child = child->children; action_child != NULL;

             action_child = action_child->next) {

                FilterAction *action;

                FilterActionType action_type = FLT_ACTION_NONE;

                xmlnode = action_child->data;

                if (!xmlnode || !xmlnode->tag || !xmlnode->tag->tag) continue;

                STR_SWITCH(xmlnode->tag->tag)

                STR_CASE_BEGIN("move")

                        action_type = FLT_ACTION_MOVE;

                STR_CASE("copy")

                        action_type = FLT_ACTION_COPY;

                STR_CASE("not-receive")

                        action_type = FLT_ACTION_NOT_RECEIVE;

                STR_CASE("delete")

                        action_type = FLT_ACTION_DELETE;

                STR_CASE("exec")

                        action_type = FLT_ACTION_EXEC;

                STR_CASE("exec-async")

                        action_type = FLT_ACTION_EXEC_ASYNC;

                STR_CASE("mark")

                        action_type = FLT_ACTION_MARK;

                STR_CASE("color-label")

                        action_type = FLT_ACTION_COLOR_LABEL;

                STR_CASE("mark-as-read")

                        action_type = FLT_ACTION_MARK_READ;

                STR_CASE("forward")

                        action_type = FLT_ACTION_FORWARD;

                STR_CASE("forward-as-attachment")

                        action_type = FLT_ACTION_FORWARD_AS_ATTACHMENT;

                STR_CASE("redirect")

                        action_type = FLT_ACTION_REDIRECT;

                STR_CASE("stop-eval")

                        action_type = FLT_ACTION_STOP_EVAL;

                STR_CASE_END

                action = filter_action_new(action_type, xmlnode->element);

                action_list = g_slist_append(action_list, action);

        }

        if (name && cond_list) {

                rule = filter_rule_new(name, bool_op, cond_list, action_list);

                rule->timing = timing;

                rule->enabled = enabled;

                if (target_folder) {

                        rule->target_folder = g_strdup(target_folder);

                        rule->recursive = recursive;

                }

                *fltlist = g_slist_prepend(*fltlist, rule);

        }

        return FALSE;

}

#undef RETURN_IF_TAG_NOT_MATCH

#undef STR_SWITCH

#undef STR_CASE_BEGIN

#undef STR_CASE

#undef STR_CASE_END

GSList *filter_xml_node_to_filter_list(GNode *node)

{

        GSList *fltlist = NULL;

        g_return_val_if_fail(node != NULL, NULL);

        g_node_traverse(node, G_PRE_ORDER, G_TRAVERSE_ALL, 2,

                        filter_xml_node_func, &fltlist);

        fltlist = g_slist_reverse(fltlist);

        return fltlist;

}

GSList *filter_read_file(const gchar *file)

{

        GNode *node;

        GSList *list;

        g_return_val_if_fail(file != NULL, NULL);

        debug_print("Reading %s\n", file);

        if (!is_file_exist(file))

                return NULL;

        node = xml_parse_file(file);

        if (!node) {

                g_warning("Can't parse %s\n", file);

                return NULL;

        }

        list = filter_xml_node_to_filter_list(node);

        xml_free_tree(node);

        return list;

}

void filter_read_config(void)

{

        gchar *rcpath;

        debug_print("Reading filter configuration...\n");

        /* remove all previous filter list */

        while (prefs_common.fltlist != NULL) {

                FilterRule *rule = (FilterRule *)prefs_common.fltlist->data;

                filter_rule_free(rule);

                prefs_common.fltlist = g_slist_remove(prefs_common.fltlist,

                                                      rule);

        }

        rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, FILTER_LIST,

                             NULL);

        prefs_common.fltlist = filter_read_file(rcpath);

        g_free(rcpath);

}

#define NODE_NEW(tag, text) \

        node = xml_node_new(xml_tag_new(tag), text)

#define ADD_ATTR(name, value) \

        xml_tag_add_attr(node->tag, xml_attr_new(name, value))

void filter_write_file(GSList *list, const gchar *file)

{

        PrefFile *pfile;

        GSList *cur;

        g_return_if_fail(file != NULL);

        if ((pfile = prefs_file_open(file)) == NULL) {

                g_warning("failed to write filter configuration to file: %s\n",

                          file);

                return;

        }

        xml_file_put_xml_decl(pfile->fp);

        fputs("\n<filter>\n", pfile->fp);

        for (cur = list; cur != NULL; cur = cur->next) {

                FilterRule *rule = (FilterRule *)cur->data;

                GSList *cur_cond;

                GSList *cur_action;

                gchar match_type[16];

                fputs("    <rule name=\"", pfile->fp);

                xml_file_put_escape_str(pfile->fp, rule->name);

                fprintf(pfile->fp, "\" timing=\"%s\"",

                        rule->timing == FLT_TIMING_ON_RECEIVE ? "receive" :

                        rule->timing == FLT_TIMING_MANUAL ? "manual" : "any");

                fprintf(pfile->fp, " enabled=\"%s\">\n",

                        rule->enabled ? "true" : "false");

                fprintf(pfile->fp, "        <condition-list bool=\"%s\">\n",

                        rule->bool_op == FLT_OR ? "or" : "and");

                for (cur_cond = rule->cond_list; cur_cond != NULL;

                     cur_cond = cur_cond->next) {

                        FilterCond *cond = (FilterCond *)cur_cond->data;

                        XMLNode *node = NULL;

                        switch (cond->match_type) {

                        case FLT_CONTAIN:

                                strcpy(match_type,

                                       FLT_IS_NOT_MATCH(cond->match_flag)

                                       ? "not-contain" : "contains");

                                break;

                        case FLT_EQUAL:

                                strcpy(match_type,

                                       FLT_IS_NOT_MATCH(cond->match_flag)

                                       ? "is-not" : "is");

                                break;

                        case FLT_REGEX:

                                strcpy(match_type,

                                       FLT_IS_NOT_MATCH(cond->match_flag)

                                       ? "not-regex" : "regex");

                                break;

                        default:

                                match_type[0] = '\0';

                                break;

                        }

                        switch (cond->type) {

                        case FLT_COND_HEADER:

                                NODE_NEW("match-header", cond->str_value);

                                ADD_ATTR("type", match_type);

                                ADD_ATTR("name", cond->header_name);

                                if (FLT_IS_CASE_SENS(cond->match_flag))

                                        ADD_ATTR("case", "true");

                                break;

                        case FLT_COND_ANY_HEADER:

                                NODE_NEW("match-any-header", cond->str_value);

                                ADD_ATTR("type", match_type);

                                if (FLT_IS_CASE_SENS(cond->match_flag))

                                        ADD_ATTR("case", "true");

                                break;

                        case FLT_COND_TO_OR_CC:

                                NODE_NEW("match-to-or-cc", cond->str_value);

                                ADD_ATTR("type", match_type);

                                if (FLT_IS_CASE_SENS(cond->match_flag))

                                        ADD_ATTR("case", "true");

                                break;

                        case FLT_COND_BODY:

                                NODE_NEW("match-body-text", cond->str_value);

                                ADD_ATTR("type", match_type);

                                if (FLT_IS_CASE_SENS(cond->match_flag))

                                        ADD_ATTR("case", "true");

                                break;

                        case FLT_COND_CMD_TEST:

                                NODE_NEW("command-test", cond->str_value);

                                break;

                        case FLT_COND_SIZE_GREATER:

                                NODE_NEW("size", itos(cond->int_value));

                                ADD_ATTR("type",

                                         FLT_IS_NOT_MATCH(cond->match_flag)

                                         ? "lt" : "gt");

                                break;

                        case FLT_COND_AGE_GREATER:

                                NODE_NEW("age", itos(cond->int_value));

                                ADD_ATTR("type",

                                         FLT_IS_NOT_MATCH(cond->match_flag)

                                         ? "lt" : "gt");

                                break;

                        case FLT_COND_UNREAD:

                                NODE_NEW("unread", NULL);

                                ADD_ATTR("type",

                                         FLT_IS_NOT_MATCH(cond->match_flag)

                                         ? "is-not" : "is");