path: root/mail/mail-autofilter.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* mail-autofilter.c
 *
 * Copyright (C) 2000  Helix Code, Inc.
 *
 * 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.
 *
 * Authors:
 *   Michael Zucchi <notzed@helixcode.com>
 *   Ettore Perazzoli <ettore@helixcode.com>
 */

/* Code for autogenerating rules or filters from a message.  */

#include <ctype.h>

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

#include <libgnomeui/gnome-app.h>
#include <libgnomeui/gnome-app-helper.h>
#include <libgnomeui/gnome-popup-menu.h>

#include "Evolution.h"
#include "evolution-storage.h"

#include "evolution-shell-component.h"
#include "folder-browser.h"
#include "mail-vfolder.h"
#include "mail-autofilter.h"

#include "camel/camel.h"

#include "filter/vfolder-context.h"
#include "filter/vfolder-rule.h"
#include "filter/vfolder-editor.h"

#include "filter/filter-context.h"
#include "filter/filter-filter.h"
#include "filter/filter-editor.h"
#include "filter/filter-option.h"

static void
rule_match_recipients(RuleContext *context, FilterRule *rule, CamelInternetAddress *iaddr)
{
    FilterPart *part;
    FilterElement *element;
    int i;
    const char *real, *addr;
    char *namestr;

    /* address types etc should handle multiple values */
    for (i=0;camel_internet_address_get(iaddr, i, &real, &addr);i++) {
        part = rule_context_create_part(context, "to");
        filter_rule_add_part((FilterRule *)rule, part);
        element = filter_part_find_element(part, "recipient-type");
        filter_option_set_current((FilterOption *)element, "contains");
        element = filter_part_find_element(part, "recipient");
        filter_input_set_value((FilterInput *)element, addr);

        namestr = g_strdup_printf(_("Mail to %s"), real&&real[0]?real:addr);
        filter_rule_set_name(rule, namestr);
        g_free(namestr);
    }
}


/* remove 're' part of a subject */
static const char *
strip_re(const char *s)
{
    const char *p;

    while (*s) {
        while (isspace(*s))
            s++;
        if (s[0] == 0)
            break;
        if ((s[0] == 'r' || s[0]=='R')
            && (s[1] == 'e' || s[1]=='E')) {
            p = s+2;
            while (isdigit(*p) || (ispunct(*p) && (*p != ':')))
                p++;
            if (*p==':') {
                s = p+1;
            } else
                break;
        } else
            break;
    }
    return s;
}

#if 0
int
reg_match(char *str, char *regstr)
{
    regex_t reg;
    int error;
    int ret;

    error = regcomp(&reg, regstr, REG_EXTENDED|REG_ICASE|REG_NOSUB);
    if (error != 0) {
        return 0;
    }
    error = regexec(&reg, str, 0, NULL, 0);
    regfree(&reg);
    return (error == 0);
}
#endif

static void
rule_add_subject(RuleContext *context, FilterRule *rule, const char *text)
{
    FilterPart *part;
    FilterElement *element;

    /* dont match on empty strings ever */
    if (*text == 0)
        return;
    part = rule_context_create_part(context, "subject");
    filter_rule_add_part((FilterRule *)rule, part);
    element = filter_part_find_element(part, "subject-type");
    filter_option_set_current((FilterOption *)element, "contains");
    element = filter_part_find_element(part, "subject");
    filter_input_set_value((FilterInput *)element, text);
}

static void
rule_add_sender(RuleContext *context, FilterRule *rule, const char *text)
{
    FilterPart *part;
    FilterElement *element;

    /* dont match on empty strings ever */
    if (*text == 0)
        return;
    part = rule_context_create_part(context, "sender");
    filter_rule_add_part((FilterRule *)rule, part);
    element = filter_part_find_element(part, "sender-type");
    filter_option_set_current((FilterOption *)element, "contains");
    element = filter_part_find_element(part, "sender");
    filter_input_set_value((FilterInput *)element, text);
}

/* do a bunch of things on the subject to try and detect mailing lists, remove
   unneeded stuff, etc */
static void
rule_match_subject(RuleContext *context, FilterRule *rule, const char *subject)
{
    const char *s;
    const char *s1, *s2;
    char *tmp;

    s = strip_re(subject);
    /* dont match on empty subject */
    if (*s == 0)
        return;

    /* [blahblah] is probably a mailing list, match on it separately */
    s1 = strchr(s, '[');
    s2 = strchr(s, ']');
    if (s1 && s2 && s1<s2) {
        /* probably a mailing list, match on the mailing list name */
        tmp = alloca(s2-s1+2);
        memcpy(tmp, s1, s2-s1+1);
        tmp[s2-s1+1] = 0;
        g_strstrip(tmp);
        rule_add_subject(context, rule, tmp);
        s = s2+1;
    }
    /* Froblah: at the start is probably something important (e.g. bug number) */
    s1 = strchr(s, ':');
    if (s1) {
        tmp = alloca(s1-s+1);
        memcpy(tmp, s, s1-s);
        tmp[s1-s] = 0;
        g_strstrip(tmp);
        rule_add_subject(context, rule, tmp);
        s = s1+1;
    }

    /* just lump the rest together */
    tmp = alloca(strlen(s)+1);
    strcpy(tmp, s);
    g_strstrip(tmp);
    rule_add_subject(context, rule, tmp);
}

static void
rule_from_message(FilterRule *rule, RuleContext *context, CamelMimeMessage *msg, int flags)
{
    CamelInternetAddress *addr;

    rule->grouping = FILTER_GROUP_ANY;

    if (flags & AUTO_SUBJECT) {
        rule_match_subject(context, rule, msg->subject);
        filter_rule_set_name(rule, strip_re(msg->subject));
    }
    /* should parse the from address into an internet address? */
    if (flags & AUTO_FROM) {
        struct _header_address *haddr, *scan;
        char *name, *namestr;

        haddr = header_address_decode(msg->from);
        scan = haddr;
        while (scan) {
            if (scan->type == HEADER_ADDRESS_NAME) {
                rule_add_sender(context, rule, scan->v.addr);
                if (scan->name)
                    name = scan->name;
                else
                    name = scan->v.addr;
                namestr = g_strdup_printf(_("Mail from %s"), name);
                filter_rule_set_name(rule, namestr);
                g_free(namestr);
            }
            scan = scan->next;
        }
        header_address_unref(haddr);
    }
    if (flags & AUTO_TO) {
        addr = (CamelInternetAddress *)camel_mime_message_get_recipients(msg, CAMEL_RECIPIENT_TYPE_TO);
        rule_match_recipients(context, rule, addr);
        addr = (CamelInternetAddress *)camel_mime_message_get_recipients(msg, CAMEL_RECIPIENT_TYPE_CC);
        rule_match_recipients(context, rule, addr);
    }
}

FilterRule *
vfolder_rule_from_message(VfolderContext *context, CamelMimeMessage *msg, int flags, const char *source)
{
    VfolderRule *rule;

    rule = vfolder_rule_new();
    vfolder_rule_add_source(rule, source);
    rule_from_message((FilterRule *)rule, (RuleContext *)context, msg, flags);

    return (FilterRule *)rule;
}

FilterRule *
filter_rule_from_message(FilterContext *context, CamelMimeMessage *msg, int flags)
{
    FilterFilter *rule;

    rule = filter_filter_new();
    rule_from_message((FilterRule *)rule, (RuleContext *)context, msg, flags);

    /* should we define the default action? */

    return (FilterRule *)rule;
}

void
filter_gui_add_from_message (CamelMimeMessage *msg, int flags)
{
    FilterContext *fc;
    char *userrules, *systemrules;
    FilterRule *rule;
    extern char *evolution_dir;
    
    fc = filter_context_new ();
    userrules = g_strdup_printf ("%s/filters.xml", evolution_dir);
    systemrules = g_strdup_printf ("%s/evolution/filtertypes.xml", EVOLUTION_DATADIR);
    rule_context_load ((RuleContext *)fc, systemrules, userrules);
    rule = filter_rule_from_message (fc, msg, flags);
    
    filter_rule_set_source (rule, FILTER_SOURCE_INCOMING);
    
    rule_context_add_rule_gui ((RuleContext *)fc, rule, _("Add Filter Rule"), userrules);
    g_free (userrules);
    g_free (systemrules);
    gtk_object_unref (GTK_OBJECT (fc));
}

void
filter_gui_add_for_mailing_list (CamelMimeMessage *msg,
                 const char *list_name,
                 const char *header_name,
                 const char *header_value)
{
    FilterContext *fc;
    FilterRule *rule;
    FilterPart *part;
    FilterElement *element;
    char *userrules, *systemrules;
    char *rule_name;
    extern char *evolution_dir;

    g_return_if_fail (msg != NULL);
    g_return_if_fail (CAMEL_IS_MIME_MESSAGE (msg));
    g_return_if_fail (list_name != NULL);
    g_return_if_fail (header_name != NULL);
    g_return_if_fail (header_value != NULL);

    fc = filter_context_new();
    userrules = g_strdup_printf("%s/filters.xml", evolution_dir);
    systemrules = g_strdup_printf("%s/evolution/filtertypes.xml", EVOLUTION_DATADIR);
    rule_context_load((RuleContext *)fc, systemrules, userrules);

    rule = (FilterRule *) filter_filter_new ();

    part = rule_context_create_part((RuleContext *)fc, "header");
    filter_rule_add_part((FilterRule *)rule, part);

    element = filter_part_find_element(part, "header-field");
    filter_input_set_value((FilterInput *)element, header_name);

    element = filter_part_find_element(part, "header-type");
    filter_option_set_current((FilterOption *)element, "contains");

    element = filter_part_find_element(part, "word");
    filter_input_set_value((FilterInput *)element, header_value);

    rule_name = g_strdup_printf (_("%s mailing list"), list_name);
    filter_rule_set_name ((FilterRule *) rule, rule_name);
    g_free (rule_name);

    rule_context_add_rule_gui ((RuleContext *)fc, rule, _("Add Filter Rule"), userrules);

    g_free (userrules);
    g_free (systemrules);
    gtk_object_unref((GtkObject *)fc);
}