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

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

#include <glib.h>

#include "camel-private.h"

#include "camel-local-store.h"
#include "camel-exception.h"
#include "camel-url.h"

#include "camel-local-folder.h"

#define d(x)

/* Returns the class for a CamelLocalStore */
#define CLOCALS_CLASS(so) CAMEL_LOCAL_STORE_CLASS (CAMEL_OBJECT_GET_CLASS(so))
#define CF_CLASS(so) CAMEL_FOLDER_CLASS (CAMEL_OBJECT_GET_CLASS(so))

static void construct (CamelService *service, CamelSession *session, CamelProvider *provider, CamelURL *url, CamelException *ex);
static CamelFolder *get_folder(CamelStore * store, const char *folder_name, guint32 flags, CamelException * ex);
static char *get_name(CamelService *service, gboolean brief);
static CamelFolder *get_inbox (CamelStore *store, CamelException *ex);
static void rename_folder(CamelStore *store, const char *old_name, const char *new_name, CamelException *ex);
static CamelFolderInfo *get_folder_info (CamelStore *store, const char *top, guint32 flags, CamelException *ex);
static void delete_folder(CamelStore *store, const char *folder_name, CamelException *ex);
static void rename_folder(CamelStore *store, const char *old, const char *new, CamelException *ex);
static CamelFolderInfo *create_folder(CamelStore *store, const char *parent_name, const char *folder_name, CamelException *ex);

static CamelStoreClass *parent_class = NULL;

static void
camel_local_store_class_init (CamelLocalStoreClass *camel_local_store_class)
{
    CamelStoreClass *camel_store_class = CAMEL_STORE_CLASS (camel_local_store_class);
    CamelServiceClass *camel_service_class = CAMEL_SERVICE_CLASS (camel_local_store_class);
    
    parent_class = CAMEL_STORE_CLASS (camel_type_get_global_classfuncs (camel_store_get_type ()));

    /* virtual method overload */
    camel_service_class->construct = construct;
    camel_service_class->get_name = get_name;
    camel_store_class->get_folder = get_folder;
    camel_store_class->get_inbox = get_inbox;
    camel_store_class->get_folder_info = get_folder_info;
    camel_store_class->free_folder_info = camel_store_free_folder_info_full;

    camel_store_class->create_folder = create_folder;
    camel_store_class->delete_folder = delete_folder;
    camel_store_class->rename_folder = rename_folder;
}

static void
camel_local_store_finalize (CamelLocalStore *local_store)
{
    if (local_store->toplevel_dir)
        g_free (local_store->toplevel_dir);
}

CamelType
camel_local_store_get_type (void)
{
    static CamelType camel_local_store_type = CAMEL_INVALID_TYPE;
    
    if (camel_local_store_type == CAMEL_INVALID_TYPE)   {
        camel_local_store_type = camel_type_register (CAMEL_STORE_TYPE, "CamelLocalStore",
                                 sizeof (CamelLocalStore),
                                 sizeof (CamelLocalStoreClass),
                                 (CamelObjectClassInitFunc) camel_local_store_class_init,
                                 NULL,
                                 NULL,
                                 (CamelObjectFinalizeFunc) camel_local_store_finalize);
    }
    
    return camel_local_store_type;
}

static void
construct (CamelService *service, CamelSession *session, CamelProvider *provider, CamelURL *url, CamelException *ex)
{
    CamelLocalStore *local_store = CAMEL_LOCAL_STORE (service);
    int len;

    CAMEL_SERVICE_CLASS (parent_class)->construct (service, session, provider, url, ex);
    if (camel_exception_is_set (ex))
        return;

    len = strlen (service->url->path);
    if (service->url->path[len - 1] != '/')
        local_store->toplevel_dir = g_strdup_printf ("%s/", service->url->path);
    else
        local_store->toplevel_dir = g_strdup (service->url->path);
}

const char *
camel_local_store_get_toplevel_dir (CamelLocalStore *store)
{
    return store->toplevel_dir;
}

static CamelFolder *
get_folder(CamelStore * store, const char *folder_name, guint32 flags, CamelException * ex)
{
    struct stat st;
    char *path = ((CamelLocalStore *)store)->toplevel_dir;
    char *sub, *slash;

    if (path[0] != '/') {
        camel_exception_setv(ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                     _("Store root %s is not an absolute path"), path);
        return NULL;
    }

    if (stat(path, &st) == 0) {
        if (!S_ISDIR(st.st_mode)) {
            camel_exception_setv(ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                         _("Store root %s is not a regular directory"), path);
        }
        return NULL;
    }

    if (errno != ENOENT
        || (flags & CAMEL_STORE_FOLDER_CREATE) == 0) {
        camel_exception_setv(ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                     _("Cannot get folder: %s: %s"), path, strerror(errno));
        return NULL;
    }

    /* need to create the dir heirarchy */
    sub = alloca(strlen(path)+1);
    strcpy(sub, path);
    slash = sub;
    do {
        slash = strchr(slash+1, '/');
        if (slash)
            *slash = 0;
        if (stat(sub, &st) == -1) {
            if (errno != ENOENT
                || mkdir(sub, 0700) == -1) {
                camel_exception_setv(ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                             _("Cannot get folder: %s: %s"), path, strerror(errno));
                return NULL;
            }
        }
        if (slash)
            *slash = '/';
    } while (slash);

    return NULL;
}

static CamelFolder *
get_inbox(CamelStore *store, CamelException *ex)
{
    camel_exception_set(ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                _("Local stores do not have an inbox"));
    return NULL;
}

static char *
get_name (CamelService *service, gboolean brief)
{
    char *dir = ((CamelLocalStore*)service)->toplevel_dir;

    if (brief)
        return g_strdup (dir);
    else
        return g_strdup_printf (_("Local mail file %s"), dir);
}

static CamelFolderInfo *
get_folder_info (CamelStore *store, const char *top,
         guint32 flags, CamelException *ex)
{
    /* FIXME: This is broken, but it corresponds to what was
     * there before.
     */

    d(printf("-- LOCAL STRE -- get folder info: %s\n", top));

    return NULL;
}

static CamelFolderInfo *
create_folder(CamelStore *store, const char *parent_name, const char *folder_name, CamelException *ex)
{
    char *path = ((CamelLocalStore *)store)->toplevel_dir;
    char *name;
    CamelFolder *folder;
    CamelFolderInfo *info = NULL;
    struct stat st;

    /* This is a pretty hacky version of create folder, but should basically work */

    /* FIXME: The strings here are funny because of string freeze */

    if (path[0] != '/') {
        camel_exception_setv(ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                     _("Store root %s is not an absolute path"), path);
        return NULL;
    }

    name = g_strdup_printf("%s/%s/%s", path, parent_name, folder_name);

    if (stat(name, &st) == 0 || errno != ENOENT) {
        camel_exception_setv(ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                     _("Cannot get folder: %s: %s"), name, strerror(errno));
        g_free(name);
        return NULL;
    }

    g_free(name);

    name = g_strdup_printf("%s/%s", parent_name, folder_name);

    folder = ((CamelStoreClass *)((CamelObject *)store)->classfuncs)->get_folder(store, name, CAMEL_STORE_FOLDER_CREATE, ex);
    if (folder) {
        camel_object_unref((CamelObject *)folder);
        info = ((CamelStoreClass *)((CamelObject *)store)->classfuncs)->get_folder_info(store, name, 0, ex);

        /* get_folder(CREATE) will emit a folder_created event for us */
        /*if (info)
          camel_object_trigger_event((CamelObject *)store, "folder_created", info);*/
    }

    g_free(name);

    return info;
}

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

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

    if (stat(old, &st) == -1) {
        if (missingok && errno == ENOENT) {
            ret = 0;
        } else {
            err = errno;
            ret = -1;
        }
    } else if (S_ISDIR(st.st_mode)) { /* use rename for dirs */
        if (rename(old, new) == 0
            || stat(new, &st) == 0) {
            ret = 0;
        } else {
            err = errno;
            ret = -1;
        }
    } else if (link(old, new) == 0 /* and link for files */
           || (stat(new, &st) == 0 && st.st_nlink == 2)) {
        if (unlink(old) == 0) {
            ret = 0;
        } else {
            err = errno;
            unlink(new);
            ret = -1;
        }
    } else {
        err = errno;
        ret = -1;
    }

    if (ret == -1) {
        camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
                     _("Could not rename folder %s to %s: %s"),
                     old, new, strerror(err));
    }

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

/* default implementation, rename all */
static void
rename_folder(CamelStore *store, const char *old, const char *new, CamelException *ex)
{
    char *path = CAMEL_LOCAL_STORE (store)->toplevel_dir;
    CamelLocalFolder *folder;
    char *newibex = g_strdup_printf("%s%s.ibex", path, new);
    char *oldibex = g_strdup_printf("%s%s.ibex", path, old);

    /* try to rollback failures, has obvious races */

    CAMEL_STORE_LOCK(store, cache_lock);
    folder = g_hash_table_lookup(store->folders, old);
    if (folder) {
        if (ibex_move(folder->index, newibex) == -1)
            goto ibex_failed;
    } else {
        if (xrename(old, new, path, ".ibex", TRUE, ex))
            goto ibex_failed;
    }

    if (xrename(old, new, path, ".ev-summary", TRUE, ex))
        goto summary_failed;

    if (xrename(old, new, path, "", FALSE, ex))
        goto base_failed;

    CAMEL_STORE_UNLOCK(store, cache_lock);

    g_free(newibex);
    g_free(oldibex);

    return;

base_failed:
    xrename(new, old, path, ".ev-summary", TRUE, ex);

summary_failed:
    if (folder)
        ibex_move(folder->index, oldibex);
    else
        xrename(new, old, path, ".ibex", TRUE, ex);

ibex_failed:
    CAMEL_STORE_UNLOCK(store, cache_lock);
    g_free(newibex);
    g_free(oldibex);
}

/* default implementation, only delete metadata */
static void
delete_folder(CamelStore *store, const char *folder_name, CamelException *ex)
{
    CamelFolderInfo *fi;
    char *name;
    char *str;

    /* remove metadata only */
    name = g_strdup_printf("%s%s", CAMEL_LOCAL_STORE(store)->toplevel_dir, folder_name);
    str = g_strdup_printf("%s.ev-summary", name);
    if (unlink(str) == -1 && errno != ENOENT) {
        camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
                     _("Could not delete folder summary file `%s': %s"),
                     str, strerror(errno));
        g_free(str);
        g_free (name);
        return;
    }
    g_free(str);
    str = g_strdup_printf("%s.ibex", name);
    if (unlink(str) == -1 && errno != ENOENT) {
        camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
                     _("Could not delete folder index file `%s': %s"),
                     str, strerror(errno));
        g_free(str);
        g_free (name);
        return;
    }
    g_free(str);
    g_free(name);
    
    fi = g_new0 (CamelFolderInfo, 1);
    fi->full_name = g_strdup (folder_name);
    fi->name = g_strdup (g_basename (folder_name));
    fi->url = g_strdup_printf ("%s%s", CAMEL_LOCAL_STORE(store)->toplevel_dir, folder_name);
    fi->unread_message_count = -1;
    camel_folder_info_build_path(fi, '/');

    camel_object_trigger_event (CAMEL_OBJECT (store),
                    "folder_deleted", fi);
    
    camel_folder_info_free (fi);
}