path: root/mail/mail-config.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Jeffrey Stedfast <fejj@ximian.com>
 *           Radek Doulik     <rodo@ximian.com>
 *
 *  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 <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <pwd.h>
#include <sys/wait.h>
#include <signal.h>
#include <errno.h>

#include <string.h>
#include <ctype.h>

#include <glib.h>
#include <gtk/gtkdialog.h>
#include <gtkhtml/gtkhtml.h>
#include <glade/glade.h>

#include <libxml/tree.h>
#include <libxml/parser.h>

#include <bonobo/bonobo-object.h>
#include <bonobo/bonobo-generic-factory.h>
#include <bonobo/bonobo-context.h>
#include <bonobo/bonobo-moniker-util.h>
#include <bonobo/bonobo-exception.h>

#include <gal/util/e-util.h>
#include <gal/widgets/e-gui-utils.h>

#include <e-util/e-url.h>
#include <e-util/e-passwords.h>
#include <e-util/e-account-list.h>
#include <e-util/e-signature-list.h>

#include <camel/camel-service.h>
#include <camel/camel-stream-mem.h>
#include <camel/camel-stream-fs.h>
#include <camel/camel-mime-filter-charset.h>
#include <camel/camel-stream-filter.h>

#include "mail-component.h"
#include "mail-session.h"
#include "mail-config.h"
#include "mail-mt.h"
#include "mail-tools.h"

/* Note, the first element of each MailConfigLabel must NOT be translated */
MailConfigLabel label_defaults[5] = {
    { "important", N_("Important"), "#ff0000" },  /* red */
    { "work",      N_("Work"),      "#ff8c00" },  /* orange */
    { "personal",  N_("Personal"),  "#008b00" },  /* forest green */
    { "todo",      N_("To Do"),     "#0000ff" },  /* blue */
    { "later",     N_("Later"),     "#8b008b" }   /* magenta */
};

typedef struct {
    GConfClient *gconf;
    
    gboolean corrupt;
    
    char *gtkrc;
    
    EAccountList *accounts;
    ESignatureList *signatures;
    
    GSList *labels;
    guint label_notify_id;
    
    guint font_notify_id;
    guint spell_notify_id;
    guint mark_citations__notify_id;
    guint citation_colour_notify_id;
    
    GPtrArray *mime_types;
    guint mime_types_notify_id;
} MailConfig;

static MailConfig *config = NULL;
static guint config_write_timeout = 0;


void
mail_config_save_accounts (void)
{
    e_account_list_save (config->accounts);
}

void
mail_config_save_signatures (void)
{
    e_signature_list_save (config->signatures);
}


static void
config_clear_labels (void)
{
    MailConfigLabel *label;
    GSList *list, *n;
    
    list = config->labels;
    while (list != NULL) {
        label = list->data;
        g_free(label->tag);
        g_free (label->name);
        g_free (label->colour);
        g_free (label);
        
        n = list->next;
        g_slist_free_1 (list);
        list = n;
    }
    
    config->labels = NULL;
}

static void
config_cache_labels (void)
{
    GSList *labels, *list, *tail, *n;
    MailConfigLabel *label;
    char *buf, *colour;
    int num = 0;
    
    tail = labels = NULL;
    
    list = gconf_client_get_list (config->gconf, "/apps/evolution/mail/labels", GCONF_VALUE_STRING, NULL);
    
    while (list != NULL) {
        buf = list->data;
        
        if (num < 5 && (colour = strrchr (buf, ':'))) {
            label = g_new (MailConfigLabel, 1);
            
            *colour++ = '\0';
            label->tag = g_strdup(label_defaults[num].tag);
            label->name = g_strdup (buf);
            label->colour = g_strdup (colour);
            
            n = g_slist_alloc ();
            n->next = NULL;
            n->data = label;
            
            if (tail == NULL)
                labels = n;
            else
                tail->next = n;
            
            tail = n;
            
            num++;
        }
        
        g_free (buf);
        
        n = list->next;
        g_slist_free_1 (list);
        list = n;
    }
    
    while (num < 5) {
        /* complete the list with defaults */
        label = g_new (MailConfigLabel, 1);
        label->tag = g_strdup (label_defaults[num].tag);
        label->name = g_strdup (_(label_defaults[num].name));
        label->colour = g_strdup (label_defaults[num].colour);
        
        n = g_slist_alloc ();
        n->next = NULL;
        n->data = label;
        
        if (tail == NULL)
            labels = n;
        else
            tail->next = n;
        
        tail = n;
        
        num++;
    }
    
    config->labels = labels;
}

static void
config_clear_mime_types (void)
{
    int i;
    
    for (i = 0; i < config->mime_types->len; i++)
        g_free (config->mime_types->pdata[i]);
    
    g_ptr_array_set_size (config->mime_types, 0);
}

static void
config_cache_mime_types (void)
{
    GSList *n, *nn;
    
    n = gconf_client_get_list (config->gconf, "/apps/evolution/mail/display/mime_types", GCONF_VALUE_STRING, NULL);
    while (n != NULL) {
        nn = n->next;
        g_ptr_array_add (config->mime_types, n->data);
        g_slist_free_1 (n);
        n = nn;
    }
    
    g_ptr_array_add (config->mime_types, NULL);
}

#define CONFIG_GET_SPELL_VALUE(t,x,prop,f,c) G_STMT_START { \
        val = gconf_client_get_without_default (config->gconf, "/GNOME/Spell" x, NULL); \
        if (val) { f; prop = c (gconf_value_get_ ## t (val)); \
        gconf_value_free (val); } } G_STMT_END

static void
config_write_style (void)
{
    int red = 0xffff, green = 0, blue = 0;
    GConfValue *val;
    gboolean custom;
    char *fix_font;
    char *var_font;
    FILE *rc;
    
    if (!(rc = fopen (config->gtkrc, "wt"))) {
        g_warning ("unable to open %s", config->gtkrc);
        return;
    }
    
    custom = gconf_client_get_bool (config->gconf, "/apps/evolution/mail/display/fonts/use_custom", NULL);
    var_font = gconf_client_get_string (config->gconf, "/apps/evolution/mail/display/fonts/variable", NULL);
    fix_font = gconf_client_get_string (config->gconf, "/apps/evolution/mail/display/fonts/monospace", NULL);

    CONFIG_GET_SPELL_VALUE (int, "/spell_error_color_red",   red, (void)0, (int));
    CONFIG_GET_SPELL_VALUE (int, "/spell_error_color_green", green, (void)0, (int));
    CONFIG_GET_SPELL_VALUE (int, "/spell_error_color_blue",  blue, (void)0, (int));

    fprintf (rc, "style \"evolution-mail-custom-fonts\" {\n");
    fprintf (rc, "        GtkHTML::spell_error_color = \"#%02x%02x%02x\"\n",
         0xff & (red >> 8), 0xff & (green >> 8), 0xff & (blue >> 8));

    if (gconf_client_get_bool (config->gconf, "/apps/evolution/mail/display/mark_citations", NULL))
        fprintf (rc, "        GtkHTML::cite_color = \"%s\"\n",
             gconf_client_get_string (config->gconf, "/apps/evolution/mail/display/citation_colour", NULL));

    if (custom && var_font && fix_font) {
        fprintf (rc,
             "        GtkHTML::fixed_font_name = \"%s\"\n"
             "        font_name = \"%s\"\n",
             fix_font, var_font); 
    }
    fprintf (rc, "}\n\n");
    
    fprintf (rc, "widget \"*.EMFolderView.*.GtkHTML\" style \"evolution-mail-custom-fonts\"\n");
    fprintf (rc, "widget \"*.EMFolderBrowser.*.GtkHTML\" style \"evolution-mail-custom-fonts\"\n");
    fprintf (rc, "widget \"*.EMMessageBrowser.*.GtkHTML\" style \"evolution-mail-custom-fonts\"\n");
    fprintf (rc, "widget \"*.BonoboPlug.*.GtkHTML\" style \"evolution-mail-custom-fonts\"\n");
    fprintf (rc, "widget \"*.EvolutionMailPrintHTMLWidget\" style \"evolution-mail-custom-fonts\"\n");
    fflush (rc);
    fclose (rc);
    
    gtk_rc_reparse_all ();
}

static void
gconf_labels_changed (GConfClient *client, guint cnxn_id,
              GConfEntry *entry, gpointer user_data)
{
    config_clear_labels ();
    config_cache_labels ();
}

static void
gconf_style_changed (GConfClient *client, guint cnxn_id,
             GConfEntry *entry, gpointer user_data)
{
    config_write_style ();
}

static void
gconf_mime_types_changed (GConfClient *client, guint cnxn_id,
              GConfEntry *entry, gpointer user_data)
{
    config_clear_mime_types ();
    config_cache_mime_types ();
}

/* Config struct routines */
void
mail_config_init (void)
{
    if (config)
        return;
    
    config = g_new0 (MailConfig, 1);
    config->gconf = gconf_client_get_default ();
    config->mime_types = g_ptr_array_new ();
    config->gtkrc = g_build_filename (g_get_home_dir (), ".evolution", "mail", "config", "gtkrc-mail-fonts", NULL);
    
    mail_config_clear ();
    
    gtk_rc_parse (config->gtkrc);
    
    gconf_client_add_dir (config->gconf, "/apps/evolution/mail/display",
                  GCONF_CLIENT_PRELOAD_ONELEVEL, NULL);
    gconf_client_add_dir (config->gconf, "/apps/evolution/mail/display/fonts",
                  GCONF_CLIENT_PRELOAD_ONELEVEL, NULL);
    gconf_client_add_dir (config->gconf, "/GNOME/Spell",
                  GCONF_CLIENT_PRELOAD_ONELEVEL, NULL);
    config->font_notify_id = gconf_client_notify_add (config->gconf, "/apps/evolution/mail/display/fonts",
                              gconf_style_changed, NULL, NULL, NULL);
    config->spell_notify_id = gconf_client_notify_add (config->gconf, "/GNOME/Spell",
                               gconf_style_changed, NULL, NULL, NULL);
    config->mark_citations__notify_id = gconf_client_notify_add (config->gconf, "/apps/evolution/mail/display/mark_citations",
                                     gconf_style_changed, NULL, NULL, NULL);
    config->citation_colour_notify_id = gconf_client_notify_add (config->gconf, "/apps/evolution/mail/display/citation_colour",
                                     gconf_style_changed, NULL, NULL, NULL);
    
    gconf_client_add_dir (config->gconf, "/apps/evolution/mail/labels",
                  GCONF_CLIENT_PRELOAD_ONELEVEL, NULL);
    config->label_notify_id =
        gconf_client_notify_add (config->gconf, "/apps/evolution/mail/labels",
                     gconf_labels_changed, NULL, NULL, NULL);
    
    gconf_client_add_dir (config->gconf, "/apps/evolution/mail/mime_types",
                  GCONF_CLIENT_PRELOAD_ONELEVEL, NULL);
    config->mime_types_notify_id =
        gconf_client_notify_add (config->gconf, "/apps/evolution/mail/mime_types",
                     gconf_mime_types_changed, NULL, NULL, NULL);
    
    config_cache_labels ();
    config_cache_mime_types ();
    
    config->accounts = e_account_list_new (config->gconf);
    config->signatures = e_signature_list_new (config->gconf);
}


void
mail_config_clear (void)
{
    if (!config)
        return;
    
    if (config->accounts) {
        g_object_unref (config->accounts);
        config->accounts = NULL;
    }
    
    if (config->signatures) {
        g_object_unref (config->signatures);
        config->signatures = NULL;
    }
    
    config_clear_labels ();
    config_clear_mime_types ();
}


void
mail_config_write (void)
{
    if (!config)
        return;
    
    e_account_list_save (config->accounts);
    e_signature_list_save (config->signatures);
    
    gconf_client_suggest_sync (config->gconf, NULL);
}

void
mail_config_write_on_exit (void)
{
    EAccount *account;
    EIterator *iter;
    
    if (config_write_timeout) {
        g_source_remove (config_write_timeout);
        config_write_timeout = 0;
        mail_config_write ();
    }
    
    /* Passwords */
    
    /* then we make sure the ones we want to remember are in the
           session cache */
    iter = e_list_get_iterator ((EList *) config->accounts);
    while (e_iterator_is_valid (iter)) {
        char *passwd;
        
        account = (EAccount *) e_iterator_get (iter);
        
        if (account->source->save_passwd && account->source->url) {
            passwd = mail_session_get_password (account->source->url);
            mail_session_forget_password (account->source->url);
            mail_session_add_password (account->source->url, passwd);
            g_free (passwd);
        }
        
        if (account->transport->save_passwd && account->transport->url) {
            passwd = mail_session_get_password (account->transport->url);
            mail_session_forget_password (account->transport->url);
            mail_session_add_password (account->transport->url, passwd);
            g_free (passwd);
        }
        
        e_iterator_next (iter);
    }
    
    g_object_unref (iter);
    
    /* then we clear out our component passwords */
    e_passwords_clear_passwords ("Mail");
    
    /* then we remember them */
    iter = e_list_get_iterator ((EList *) config->accounts);
    while (e_iterator_is_valid (iter)) {
        account = (EAccount *) e_iterator_get (iter);
        
        if (account->source->save_passwd && account->source->url)
            mail_session_remember_password (account->source->url);
        
        if (account->transport->save_passwd && account->transport->url)
            mail_session_remember_password (account->transport->url);
        
        e_iterator_next (iter);
    }
    
    /* now do cleanup */
    mail_config_clear ();
    
    g_object_unref (config->gconf);
    g_ptr_array_free (config->mime_types, TRUE);
    
    g_free (config->gtkrc);
    
    g_free (config);
}

/* Accessor functions */
GConfClient *
mail_config_get_gconf_client (void)
{
    return config->gconf;
}

gboolean
mail_config_is_configured (void)
{
    return e_list_length ((EList *) config->accounts) > 0;
}

gboolean
mail_config_is_corrupt (void)
{
    return config->corrupt;
}

GSList *
mail_config_get_labels (void)
{
    return config->labels;
}

const char *
mail_config_get_label_color_by_name (const char *name)
{
    MailConfigLabel *label;
    GSList *node;
    
    node = config->labels;
    while (node != NULL) {
        label = node->data;
        if (!strcmp (label->tag, name))
            return label->colour;
        node = node->next;
    }
    
    return NULL;
}

const char *
mail_config_get_label_color_by_index (int index)
{
    MailConfigLabel *label;
    
    label = g_slist_nth_data (config->labels, index);
    
    if (label)
        return label->colour;
    
    return NULL;
}

const char **
mail_config_get_allowable_mime_types (void)
{
    return (const char **) config->mime_types->pdata;
}

gboolean
mail_config_find_account (EAccount *account)
{
    EAccount *acnt;
    EIterator *iter;
    
    iter = e_list_get_iterator ((EList *) config->accounts);
    while (e_iterator_is_valid (iter)) {
        acnt = (EAccount *) e_iterator_get (iter);
        if (acnt == account) {
            g_object_unref (iter);
            return TRUE;
        }
        
        e_iterator_next (iter);
    }
    
    g_object_unref (iter);
    
    return FALSE;
}

EAccount *
mail_config_get_default_account (void)
{
    if (config == NULL)
        mail_config_init ();
    
    if (!config->accounts)
        return NULL;

    /* should probably return const */
    return (EAccount *)e_account_list_get_default(config->accounts);
}

EAccount *
mail_config_get_account_by_name (const char *account_name)
{
    return (EAccount *)e_account_list_find(config->accounts, E_ACCOUNT_FIND_NAME, account_name);
}

EAccount *
mail_config_get_account_by_uid (const char *uid)
{
    return (EAccount *) e_account_list_find (config->accounts, E_ACCOUNT_FIND_UID, uid);
}

EAccount *
mail_config_get_account_by_source_url (const char *source_url)
{
    CamelProvider *provider;
    EAccount *account;
    CamelURL *source;
    EIterator *iter;
    
    g_return_val_if_fail (source_url != NULL, NULL);
    
    provider = camel_provider_get(source_url, NULL);
    if (!provider)
        return NULL;
    
    source = camel_url_new (source_url, NULL);
    if (!source)
        return NULL;
    
    iter = e_list_get_iterator ((EList *) config->accounts);
    while (e_iterator_is_valid (iter)) {
        account = (EAccount *) e_iterator_get (iter);
        
        if (account->source && account->source->url) {
            CamelURL *url;
            
            url = camel_url_new (account->source->url, NULL);
            if (url && provider->url_equal (url, source)) {
                camel_url_free (url);
                camel_url_free (source);
                g_object_unref (iter);
                
                return account;
            }
            
            if (url)
                camel_url_free (url);
        }
        
        e_iterator_next (iter);
    }
    
    g_object_unref (iter);
    
    camel_url_free (source);
    
    return NULL;
}

EAccount *
mail_config_get_account_by_transport_url (const char *transport_url)
{
    CamelProvider *provider;
    CamelURL *transport;
    EAccount *account;
    EIterator *iter;
    
    g_return_val_if_fail (transport_url != NULL, NULL);
    
    provider = camel_provider_get(transport_url, NULL);
    if (!provider)
        return NULL;
    
    transport = camel_url_new (transport_url, NULL);
    if (!transport)
        return NULL;
    
    iter = e_list_get_iterator ((EList *) config->accounts);
    while (e_iterator_is_valid (iter)) {
        account = (EAccount *) e_iterator_get (iter);
        
        if (account->transport && account->transport->url) {
            CamelURL *url;
            
            url = camel_url_new (account->transport->url, NULL);
            if (url && provider->url_equal (url, transport)) {
                camel_url_free (url);
                camel_url_free (transport);
                g_object_unref (iter);
                
                return account;
            }
            
            if (url)
                camel_url_free (url);
        }
        
        e_iterator_next (iter);
    }
    
    g_object_unref (iter);
    
    camel_url_free (transport);
    
    return NULL;
}

EAccountList *
mail_config_get_accounts (void)
{
    g_assert (config != NULL);
    
    return config->accounts;
}

void
mail_config_add_account (EAccount *account)
{
    e_account_list_add(config->accounts, account);
    mail_config_save_accounts ();
}

void
mail_config_remove_account (EAccount *account)
{
    e_account_list_remove(config->accounts, account);
    mail_config_save_accounts ();
}

void
mail_config_set_default_account (EAccount *account)
{
    e_account_list_set_default(config->accounts, account);
}

EAccountIdentity *
mail_config_get_default_identity (void)
{
    EAccount *account;
    
    account = mail_config_get_default_account ();
    if (account)
        return account->id;
    else
        return NULL;
}

EAccountService *
mail_config_get_default_transport (void)
{
    EAccount *account;
    EIterator *iter;
    
    account = mail_config_get_default_account ();
    if (account && account->transport && account->transport->url)
        return account->transport;
    
    /* return the first account with a transport? */
    iter = e_list_get_iterator ((EList *) config->accounts);
    while (e_iterator_is_valid (iter)) {
        account = (EAccount *) e_iterator_get (iter);
        
        if (account->transport && account->transport->url) {
            g_object_unref (iter);
            
            return account->transport;
        }
        
        e_iterator_next (iter);
    }
    
    g_object_unref (iter);
    
    return NULL;
}

static char *
uri_to_evname (const char *uri, const char *prefix)
{
    const char *base_directory = mail_component_peek_base_directory (mail_component_peek ());
    char *safe;
    char *tmp;
    
    safe = g_strdup (uri);
    e_filename_make_safe (safe);
    /* blah, easiest thing to do */
    if (prefix[0] == '*')
        tmp = g_strdup_printf ("%s/mail/%s%s.xml", base_directory, prefix + 1, safe);
    else
        tmp = g_strdup_printf ("%s/mail/%s%s", base_directory, prefix, safe);
    g_free (safe);
    return tmp;
}

void
mail_config_uri_renamed (GCompareFunc uri_cmp, const char *old, const char *new)
{
    EAccount *account;
    EIterator *iter;
    int i, work = 0;
    char *oldname, *newname;
    char *cachenames[] = { "config/hidestate-", 
                   "config/et-expanded-", 
                   "config/et-header-", 
                   "*views/current_view-",
                   "*views/custom_view-",
                   NULL };
    
    iter = e_list_get_iterator ((EList *) config->accounts);
    while (e_iterator_is_valid (iter)) {
        account = (EAccount *) e_iterator_get (iter);
        
        if (account->sent_folder_uri && uri_cmp (account->sent_folder_uri, old)) {
            g_free (account->sent_folder_uri);
            account->sent_folder_uri = g_strdup (new);
            work = 1;
        }
        
        if (account->drafts_folder_uri && uri_cmp (account->drafts_folder_uri, old)) {
            g_free (account->drafts_folder_uri);
            account->drafts_folder_uri = g_strdup (new);
            work = 1;
        }
        
        e_iterator_next (iter);
    }
    
    g_object_unref (iter);
    
    /* ignore return values or if the files exist or
     * not, doesn't matter */
    
    for (i = 0; cachenames[i]; i++) {
        oldname = uri_to_evname (old, cachenames[i]);
        newname = uri_to_evname (new, cachenames[i]);
        /*printf ("** renaming %s to %s\n", oldname, newname);*/
        rename (oldname, newname);
        g_free (oldname);
        g_free (newname);
    }
    
    /* nasty ... */
    if (work)
        mail_config_write ();
}

void
mail_config_uri_deleted (GCompareFunc uri_cmp, const char *uri)
{
    EAccount *account;
    EIterator *iter;
    int work = 0;
    /* assumes these can't be removed ... */
    const char *default_sent_folder_uri = mail_component_get_folder_uri(NULL, MAIL_COMPONENT_FOLDER_SENT);
    const char *default_drafts_folder_uri = mail_component_get_folder_uri(NULL, MAIL_COMPONENT_FOLDER_DRAFTS);
    
    iter = e_list_get_iterator ((EList *) config->accounts);
    while (e_iterator_is_valid (iter)) {
        account = (EAccount *) e_iterator_get (iter);
        
        if (account->sent_folder_uri && uri_cmp (account->sent_folder_uri, uri)) {
            g_free (account->sent_folder_uri);
            account->sent_folder_uri = g_strdup (default_sent_folder_uri);
            work = 1;
        }
        
        if (account->drafts_folder_uri && uri_cmp (account->drafts_folder_uri, uri)) {
            g_free (account->drafts_folder_uri);
            account->drafts_folder_uri = g_strdup (default_drafts_folder_uri);
            work = 1;
        }
        
        e_iterator_next (iter);
    }
    
    /* nasty again */
    if (work)
        mail_config_write ();
}

void 
mail_config_service_set_save_passwd (EAccountService *service, gboolean save_passwd)
{
    service->save_passwd = save_passwd;
}

char *
mail_config_folder_to_safe_url (CamelFolder *folder)
{
    char *url;
    
    url = mail_tools_folder_to_url (folder);
    e_filename_make_safe (url);
    
    return url;
}

char *
mail_config_folder_to_cachename (CamelFolder *folder, const char *prefix)
{
    char *url, *basename, *filename;
    const char *evolution_dir;
    
    evolution_dir = mail_component_peek_base_directory (mail_component_peek ());
    
    url = mail_config_folder_to_safe_url (folder);
    basename = g_strdup_printf ("%s%s", prefix, url);
    filename = g_build_filename (evolution_dir, "mail", "config", basename, NULL);
    g_free (basename);
    g_free (url);
    
    return filename;
}

ESignatureList *
mail_config_get_signatures (void)
{
    return config->signatures;
}

static char *
get_new_signature_filename (void)
{
    const char *base_directory;
    char *filename, *id;
    struct stat st;
    int i;

    base_directory = mail_component_peek_base_directory (mail_component_peek ());
    filename = g_build_filename (base_directory, "signatures", NULL);
    if (lstat (filename, &st)) {
        if (errno == ENOENT) {
            if (mkdir (filename, 0700))
                g_warning ("Fatal problem creating %s directory.", filename);
        } else
            g_warning ("Fatal problem with %s directory.", filename);
    }
    g_free (filename);
    
    filename = g_malloc (strlen (base_directory) + sizeof ("/signatures/signature-") + 12);
    id = g_stpcpy (filename, base_directory);
    id = g_stpcpy (id, "/signatures/signature-");
    
    for (i = 0; i < (INT_MAX - 1); i++) {
        sprintf (id, "%d", i);
        if (lstat (filename, &st) == -1 && errno == ENOENT) {
            int fd;
            
            fd = creat (filename, 0600);
            if (fd >= 0) {
                close (fd);
                return filename;
            }
        }
    }
    
    g_free (filename);
    
    return NULL;
}


ESignature *
mail_config_signature_new (const char *filename, gboolean script, gboolean html)
{
    ESignature *sig;
    
    sig = e_signature_new ();
    sig->name = g_strdup (_("Unnamed"));
    sig->script = script;
    sig->html = html;
    
    if (filename == NULL)
        sig->filename = get_new_signature_filename ();
    else
        sig->filename = g_strdup (filename);
    
    return sig;
}

ESignature *
mail_config_get_signature_by_uid (const char *uid)
{
    return (ESignature *) e_signature_list_find (config->signatures, E_SIGNATURE_FIND_UID, uid);
}

ESignature *
mail_config_get_signature_by_name (const char *name)
{
    return (ESignature *) e_signature_list_find (config->signatures, E_SIGNATURE_FIND_NAME, name);
}

void
mail_config_add_signature (ESignature *signature)
{
    e_signature_list_add (config->signatures, signature);
    mail_config_save_signatures ();
}

void
mail_config_remove_signature (ESignature *signature)
{
    if (signature->filename && !signature->script)
        unlink (signature->filename);
    
    e_signature_list_remove (config->signatures, signature);
    mail_config_save_signatures ();
}

char *
mail_config_signature_run_script (const char *script)
{
    int result, status;
    int in_fds[2];
    pid_t pid;
    
    if (pipe (in_fds) == -1) {
        g_warning ("Failed to create pipe to '%s': %s", script, g_strerror (errno));
        return NULL;
    }
    
    if (!(pid = fork ())) {
        /* child process */
        int maxfd, i;
        
        close (in_fds [0]);
        if (dup2 (in_fds[1], STDOUT_FILENO) < 0)
            _exit (255);
        close (in_fds [1]);
        
        setsid ();
        
        maxfd = sysconf (_SC_OPEN_MAX);
        for (i = 3; i < maxfd; i++) {
            if (i != STDIN_FILENO && i != STDOUT_FILENO && i != STDERR_FILENO)
                fcntl (i, F_SETFD, FD_CLOEXEC);
        }
        
        execlp (script, script, NULL);
        g_warning ("Could not execute %s: %s\n", script, g_strerror (errno));
        _exit (255);
    } else if (pid < 0) {
        g_warning ("Failed to create create child process '%s': %s", script, g_strerror (errno));
        return NULL;
    } else {
        CamelStreamFilter *filtered_stream;
        CamelStreamMem *memstream;
        CamelMimeFilter *charenc;
        CamelStream *stream;
        GByteArray *buffer;
        char *charset;
        char *content;
        
        /* parent process */
        close (in_fds[1]);
        
        stream = camel_stream_fs_new_with_fd (in_fds[0]);
        
        memstream = (CamelStreamMem *) camel_stream_mem_new ();
        buffer = g_byte_array_new ();
        camel_stream_mem_set_byte_array (memstream, buffer);
        
        camel_stream_write_to_stream (stream, (CamelStream *) memstream);
        camel_object_unref (stream);
        
        /* signature scripts are supposed to generate UTF-8 content, but because users
           are known to not ever read the manual... we try to do our best if the
                   content isn't valid UTF-8 by assuming that the content is in the user's
           preferred charset. */
        if (!g_utf8_validate (buffer->data, buffer->len, NULL)) {
            stream = (CamelStream *) memstream;
            memstream = (CamelStreamMem *) camel_stream_mem_new ();
            camel_stream_mem_set_byte_array (memstream, g_byte_array_new ());
            
            filtered_stream = camel_stream_filter_new_with_stream (stream);
            camel_object_unref (stream);
            
            charset = gconf_client_get_string (config->gconf, "/apps/evolution/mail/composer/charset", NULL);
            if (charset && *charset) {
                if ((charenc = (CamelMimeFilter *) camel_mime_filter_charset_new_convert (charset, "utf-8"))) {
                    camel_stream_filter_add (filtered_stream, charenc);
                    camel_object_unref (charenc);
                }
            }
            g_free (charset);
            
            camel_stream_write_to_stream ((CamelStream *) filtered_stream, (CamelStream *) memstream);
            camel_object_unref (filtered_stream);
            g_byte_array_free (buffer, TRUE);
            
            buffer = memstream->buffer;
        }
        
        camel_object_unref (memstream);
        
        g_byte_array_append (buffer, "", 1);
        content = buffer->data;
        g_byte_array_free (buffer, FALSE);
        
        /* wait for the script process to terminate */
        result = waitpid (pid, &status, 0);
        
        if (result == -1 && errno == EINTR) {
            /* child process is hanging... */
            kill (pid, SIGTERM);
            sleep (1);
            result = waitpid (pid, &status, WNOHANG);
            if (result == 0) {
                /* ...still hanging, set phasers to KILL */
                kill (pid, SIGKILL);
                sleep (1);
                result = waitpid (pid, &status, WNOHANG);
            }
        }
        
        return content;
    }
}