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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
 *
 * Copyright (C) 2000 Helix Code, Inc.
 *
 * Authors: Michael Zucchi <notzed@helixcode.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 <sys/stat.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>

#include <dirent.h>

#include "camel-maildir-store.h"
#include "camel-maildir-folder.h"
#include "camel-exception.h"
#include "camel-url.h"

static CamelLocalStoreClass *parent_class = NULL;

/* Returns the class for a CamelMaildirStore */
#define CMAILDIRS_CLASS(so) CAMEL_MAILDIR_STORE_CLASS (CAMEL_OBJECT_GET_CLASS(so))
#define CF_CLASS(so) CAMEL_FOLDER_CLASS (CAMEL_OBJECT_GET_CLASS(so))
#define CMAILDIRF_CLASS(so) CAMEL_MAILDIR_FOLDER_CLASS (CAMEL_OBJECT_GET_CLASS(so))

static CamelFolder *get_folder(CamelStore * store, const char *folder_name, guint32 flags, CamelException * ex);
static void delete_folder(CamelStore * store, const char *folder_name, CamelException * ex);

static void camel_maildir_store_class_init(CamelObjectClass * camel_maildir_store_class)
{
    CamelStoreClass *camel_store_class = CAMEL_STORE_CLASS(camel_maildir_store_class);
    /*CamelServiceClass *camel_service_class = CAMEL_SERVICE_CLASS(camel_maildir_store_class);*/

    parent_class = (CamelLocalStoreClass *)camel_type_get_global_classfuncs(camel_local_store_get_type());

    /* virtual method overload, use defaults for most */
    camel_store_class->get_folder = get_folder;
    camel_store_class->delete_folder = delete_folder;
}

CamelType camel_maildir_store_get_type(void)
{
    static CamelType camel_maildir_store_type = CAMEL_INVALID_TYPE;

    if (camel_maildir_store_type == CAMEL_INVALID_TYPE) {
        camel_maildir_store_type = camel_type_register(CAMEL_LOCAL_STORE_TYPE, "CamelMaildirStore",
                              sizeof(CamelMaildirStore),
                              sizeof(CamelMaildirStoreClass),
                              (CamelObjectClassInitFunc) camel_maildir_store_class_init,
                              NULL,
                              NULL,
                              NULL);
    }

    return camel_maildir_store_type;
}

static CamelFolder *get_folder(CamelStore * store, const char *folder_name, guint32 flags, CamelException * ex)
{
    char *name, *tmp, *cur, *new;
    struct stat st;
    CamelFolder *folder = NULL;

    (void) ((CamelStoreClass *)parent_class)->get_folder(store, folder_name, flags, ex);
    if (camel_exception_is_set(ex))
        return NULL;

    name = g_strdup_printf("%s%s", CAMEL_SERVICE(store)->url->path, folder_name);
    tmp = g_strdup_printf("%s/tmp", name);
    cur = g_strdup_printf("%s/cur", name);
    new = g_strdup_printf("%s/new", name);

    if (stat(name, &st) == -1) {
        if (errno != ENOENT) {
            camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
                         _("Could not open folder `%s':\n%s"),
                         folder_name, strerror(errno));
        } else if ((flags & CAMEL_STORE_FOLDER_CREATE) == 0) {
            camel_exception_setv(ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                         _("Folder `%s' does not exist."), folder_name);
        } else {
            if (mkdir(name, 0700) != 0
                || mkdir(tmp, 0700) != 0
                || mkdir(cur, 0700) != 0
                || mkdir(new, 0700) != 0) {
                camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
                             _("Could not create folder `%s':\n%s"),
                             folder_name, strerror(errno));
                rmdir(tmp);
                rmdir(cur);
                rmdir(new);
                rmdir(name);
            } else {
                folder = camel_maildir_folder_new(store, folder_name, flags, ex);
            }
        }
    } else if (!S_ISDIR(st.st_mode)
           || stat(tmp, &st) != 0 || !S_ISDIR(st.st_mode)
           || stat(cur, &st) != 0 || !S_ISDIR(st.st_mode)
           || stat(new, &st) != 0 || !S_ISDIR(st.st_mode)) {
        camel_exception_setv(ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                     _("`%s' is not a maildir directory."), name);
    } else {
        folder = camel_maildir_folder_new(store, folder_name, flags, ex);
    }

    g_free(name);
    g_free(tmp);
    g_free(cur);
    g_free(new);

    return folder;
}

static void delete_folder(CamelStore * store, const char *folder_name, CamelException * ex)
{
    char *name, *tmp, *cur, *new;
    struct stat st;

    name = g_strdup_printf("%s%s", CAMEL_SERVICE(store)->url->path, folder_name);

    tmp = g_strdup_printf("%s/tmp", name);
    cur = g_strdup_printf("%s/cur", name);
    new = g_strdup_printf("%s/new", name);

    if (stat(name, &st) == -1 || !S_ISDIR(st.st_mode)
        || stat(tmp, &st) == -1 || !S_ISDIR(st.st_mode)
        || stat(cur, &st) == -1 || !S_ISDIR(st.st_mode)
        || stat(new, &st) == -1 || !S_ISDIR(st.st_mode)) {
        camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
                     _("Could not delete folder `%s': %s"),
                     folder_name, errno?strerror(errno):_("not a maildir directory"));
    } else {
        int err = 0;

        /* remove subdirs first - will fail if not empty */
        if (rmdir(cur) == -1 || rmdir(new) == -1) {
            err = errno;
        } else {
            DIR *dir;
            struct dirent *d;

            /* for tmp (only), its contents is irrelevant */
            dir = opendir(tmp);
            if (dir) {
                while ( (d=readdir(dir)) ) {
                    char *name = d->d_name, *file;

                    if (!strcmp(name, ".") || !strcmp(name, ".."))
                        continue;
                    file = g_strdup_printf("%s/%s", tmp, name);
                    unlink(file);
                    g_free(file);
                }
                closedir(dir);
            }
            if (rmdir(tmp) == -1 || rmdir(name) == -1)
                err = errno;
        }

        if (err != 0) {
            /* easier just to mkdir all (and let them fail), than remember what we got to */
            mkdir(name, 0700);
            mkdir(cur, 0700);
            mkdir(new, 0700);
            mkdir(tmp, 0700);
            camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
                         _("Could not delete folder `%s': %s"),
                         folder_name, strerror(err));
        } else {
            /* and remove metadata */
            ((CamelStoreClass *)parent_class)->delete_folder(store, folder_name, ex);
        }
    }

    g_free(name);
    g_free(tmp);
    g_free(cur);
    g_free(new);
}