path: root/camel/providers/mbox/camel-mbox-store.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-mbox-store.c : class for an mbox store */

/* 
 *
 * Copyright (C) 2000 Helix Code, Inc. <bertrand@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
 */


#include <config.h>

#include <sys/stat.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>

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

/* Returns the class for a CamelMboxStore */
#define CMBOXS_CLASS(so) CAMEL_MBOX_STORE_CLASS (CAMEL_OBJECT_GET_CLASS(so))
#define CF_CLASS(so) CAMEL_FOLDER_CLASS (CAMEL_OBJECT_GET_CLASS(so))
#define CMBOXF_CLASS(so) CAMEL_MBOX_FOLDER_CLASS (CAMEL_OBJECT_GET_CLASS(so))

static char *get_name (CamelService *service, gboolean brief);
static CamelFolder *get_folder (CamelStore *store, const char *folder_name,
                gboolean create, CamelException *ex);
static void delete_folder (CamelStore *store, const char *folder_name,
               CamelException *ex);
static void rename_folder(CamelStore *store, const char *old_name, const char *new_name, CamelException *ex);
static char *get_folder_name (CamelStore *store, const char *folder_name,
                  CamelException *ex);

static void
camel_mbox_store_class_init (CamelMboxStoreClass *camel_mbox_store_class)
{
    CamelStoreClass *camel_store_class = CAMEL_STORE_CLASS (camel_mbox_store_class);
    CamelServiceClass *camel_service_class = CAMEL_SERVICE_CLASS (camel_mbox_store_class);
    
    /* virtual method overload */
    camel_service_class->get_name = get_name;

    camel_store_class->get_folder = get_folder;
    camel_store_class->delete_folder = delete_folder;
    camel_store_class->rename_folder = rename_folder;
    camel_store_class->get_folder_name = get_folder_name;
}

static void
camel_mbox_store_init (gpointer object, gpointer klass)
{
    CamelService *service = CAMEL_SERVICE (object);
    CamelStore *store = CAMEL_STORE (object);

    service->url_flags = CAMEL_SERVICE_URL_NEED_PATH;

    /* mbox names are filenames, so they are case-sensitive. */
    store->folders = g_hash_table_new (g_str_hash, g_str_equal);
}

CamelType
camel_mbox_store_get_type (void)
{
    static CamelType camel_mbox_store_type = CAMEL_INVALID_TYPE;
    
    if (camel_mbox_store_type == CAMEL_INVALID_TYPE)    {
        camel_mbox_store_type = camel_type_register (CAMEL_STORE_TYPE, "CamelMboxStore",
                                 sizeof (CamelMboxStore),
                                 sizeof (CamelMboxStoreClass),
                                 (CamelObjectClassInitFunc) camel_mbox_store_class_init,
                                 NULL,
                                 (CamelObjectInitFunc) camel_mbox_store_init,
                                 NULL);
    }
    
    return camel_mbox_store_type;
}

const gchar *
camel_mbox_store_get_toplevel_dir (CamelMboxStore *store)
{
    CamelURL *url = CAMEL_SERVICE (store)->url;

    g_assert (url != NULL);
    return url->path;
}

static CamelFolder *
get_folder (CamelStore *store, const char *folder_name, gboolean create,
        CamelException *ex)
{
    CamelFolder *new_folder;
    char *name;
    struct stat st;

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

    if (stat (name, &st) == -1) {
        int fd;

        if (errno != ENOENT) {
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          "Could not open folder `%s':"
                          "\n%s", folder_name,
                          g_strerror (errno));
            g_free (name);
            return NULL;
        }
        if (!create) {
            camel_exception_setv (ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                          "Folder `%s' does not exist.",
                          folder_name);
            g_free (name);
            return NULL;
        }

        fd = open (name, O_WRONLY | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
        g_free (name);
        if (fd == -1) {
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          "Could not create folder `%s':"
                          "\n%s", folder_name,
                          g_strerror (errno));
            return NULL;
        }
        close (fd);
    } else if (!S_ISREG (st.st_mode)) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                      "`%s' is not a regular file.",
                      name);
        g_free (name);
        return NULL;
    } else
        g_free (name);

    new_folder =  CAMEL_FOLDER (camel_object_new (CAMEL_MBOX_FOLDER_TYPE));
    
    CF_CLASS (new_folder)->init (new_folder, store, NULL,
                     folder_name, "/", TRUE, ex);
    
    return new_folder;
}

static void
delete_folder (CamelStore *store, const char *folder_name, CamelException *ex)
{
    char *name, *name2;
    struct stat st;
    int status;

    name = g_strdup_printf ("%s%s", CAMEL_SERVICE (store)->url->path, folder_name);
    if (stat (name, &st) == -1) {
        if (errno == ENOENT) {
            /* file doesn't exist - it's kinda like deleting it ;-) */
            g_free (name);
            return;
        }

        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      "Could not delete folder `%s':\n%s",
                      folder_name, g_strerror (errno));
        g_free (name);
        return;
    }
    
    if (!S_ISREG (st.st_mode)) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                      "`%s' is not a regular file.", name);
        g_free (name);
        return;
    }
    
    if (st.st_size != 0) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_FOLDER_NON_EMPTY,
                      "Folder `%s' is not empty. Not deleted.",
                      folder_name);
        g_free (name);
        return;
    }

    /* Delete index and summary first, then the main file. */
    name2 = g_strdup_printf ("%s.ibex", name);
    status = unlink (name2);
    g_free (name2);
    if (status == 0 || errno == ENOENT) {
        name2 = g_strdup_printf ("%s-ev-summary", name);
        status = unlink (name2);
        g_free (name2);
    }
    if (status == 0 || errno == ENOENT)
        status = unlink (name);
    g_free (name);

    if (status == -1 && errno != ENOENT) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      "Could not delete folder `%s':\n%s",
                      folder_name, g_strerror (errno));
    }
}

static int xrename(const char *oldp, const char *newp, const char *prefix, const char *suffix, CamelException *ex)
{
    struct stat st;
    char *old = g_strconcat(prefix, oldp, suffix, 0);
    char *new = g_strconcat(prefix, newp, suffix, 0);
    int ret = -1;

    printf("renaming %s%s to %s%s\n", oldp, suffix, newp, suffix);

    /* FIXME: this has races ... */
    if (!(stat(new, &st) == -1 && errno==ENOENT)) {
        camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
                     "Could not rename folder %s to %s: destination exists",
                     old, new);
    } else if (rename(old, new) == 0 || errno==ENOENT) {
        ret = 0;
    } else if (stat(old, &st) == -1 && errno==ENOENT && stat(new, &st) == 0) {
        /* for nfs, check if the rename worked anyway ... */
        ret = 0;
    }
    printf("success = %d\n", ret);

    g_free(old);
    g_free(new);
    return ret;
}

static void rename_folder(CamelStore *store, const char *old, const char *new, CamelException *ex)
{
    char *path = CAMEL_SERVICE (store)->url->path;

    /* try to rollback failures, has obvious races */
    if (xrename(old, new, path, ".ibex", ex)) {
        return;
    }
    if (xrename(old, new, path, "-ev-summary", ex)) {
        xrename(new, old, path, ".ibex", ex);
        return;
    }
    if (xrename(old, new, path, "", ex)) {
        xrename(new, old, path, "-ev-summary", ex);
        xrename(new, old, path, ".ibex", ex);
    }
}

static char *
get_folder_name (CamelStore *store, const char *folder_name, CamelException *ex)
{
    /* For now, we don't allow hieararchy. FIXME. */
    if (strchr (folder_name + 1, '/')) {
        camel_exception_set (ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                     "Mbox folders may not be nested.");
        return NULL;
    }

    return *folder_name == '/' ? g_strdup (folder_name) :
        g_strdup_printf ("/%s", folder_name);
}

static char *
get_name (CamelService *service, gboolean brief)
{
    if (brief)
        return g_strdup (service->url->path);
    else
        return g_strdup_printf ("Local mail file %s", service->url->path);
}