path: root/shell/e-local-storage.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-local-storage.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.
 *
 * Author: Ettore Perazzoli
 */

/* FIXMEs:
 *
 *   - If we have `.' or `..' as path elements, we lose.
 *
 *   - If the LocalStorage is destroyed and an async operation on a shell component is
 *     pending, we get a callback on a bogus object.  We need support for cancelling
 *     operations on the shell component.
 */

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

#include <dirent.h>

#include <errno.h>
#include <string.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <gnome.h>

#include "e-util/e-util.h"
#include "e-local-folder.h"

#include "e-local-storage.h"


#define PARENT_TYPE E_TYPE_STORAGE
static EStorageClass *parent_class = NULL;

#define SUBFOLDER_DIR_NAME     "subfolders"
#define SUBFOLDER_DIR_NAME_LEN 10

struct _ELocalStoragePrivate {
    EFolderTypeRegistry *folder_type_registry;
    char *base_path;
};


/* Utility functions.  */

/* Translate a storage path into a physical path on the file system.  */
static char *
get_physical_path (ELocalStorage *local_storage,
           const char *path)
{
    EStorage *storage;
    ELocalStoragePrivate *priv;
    const char *p, *newp;
    char *dp;
    char *real_path;
    int real_path_len;
    int base_path_len;

    storage = E_STORAGE (local_storage);
    priv = local_storage->priv;

    /* @path is always absolute, so it starts with a slash.  The base class should
           make sure this is the case; if not, it's broken.  */
    g_assert (*path == G_DIR_SEPARATOR);
    path++;

    /* Calculate the length of the real path. */

    real_path_len = strlen (path);
    real_path_len++;    /* For the ending zero.  */

    base_path_len = strlen (priv->base_path);
    real_path_len += base_path_len;
    real_path_len++;    /* For the separating slash.  */

    /* Take account for the fact that we need to translate every separator into
           `subfolders/'. */
    p = path;
    while (1) {
        newp = strchr (p, G_DIR_SEPARATOR);
        if (newp == NULL)
            break;

        real_path_len += SUBFOLDER_DIR_NAME_LEN;
        real_path_len++; /* For the separating slash.  */

        /* Skip consecutive slashes.  */
        while (*newp == G_DIR_SEPARATOR)
            newp++;

        p = newp;
    };

    real_path = g_malloc (real_path_len);
    dp = real_path;

    memcpy (dp, priv->base_path, base_path_len);
    dp += base_path_len;
    *(dp++) = G_DIR_SEPARATOR;

    /* Copy the mangled path.  */
    p = path;
    while (1) {
        newp = strchr (p, G_DIR_SEPARATOR);
        if (newp == NULL) {
            strcpy (dp, p);
            break;
        }

        memcpy (dp, p, newp - p + 1); /* `+ 1' to copy the slash too.  */
        dp += newp - p + 1;

        memcpy (dp, SUBFOLDER_DIR_NAME, SUBFOLDER_DIR_NAME_LEN);
        dp += SUBFOLDER_DIR_NAME_LEN;

        *(dp++) = G_DIR_SEPARATOR;

        /* Skip consecutive slashes.  */
        while (*newp == G_DIR_SEPARATOR)
            newp++;

        p = newp;
    }

    return real_path;
}

static gboolean
load_folders (ELocalStorage *local_storage,
          const char *parent_path,
          const char *path,
          const char *physical_path)
{
    DIR *dir;
    char *subfolder_directory_path;

    if (parent_path == NULL) {
        /* On the top level, we don't have any folders and, consequently, no
           subfolder directory.  */

        subfolder_directory_path = g_strdup (physical_path);
    } else {
        EFolder *folder;

        /*  Otherwise, we have to load the corresponding folder.  */

        folder = e_local_folder_new_from_path (physical_path);
        if (folder == NULL)
            return FALSE;

        e_storage_new_folder (E_STORAGE (local_storage), path, folder);

        subfolder_directory_path = g_concat_dir_and_file (physical_path, SUBFOLDER_DIR_NAME);
    }

    /* Now scan the subfolders and load them.  The subfolders are represented by
           directories under the "SUBFOLDER_DIR_NAME" directory.  */

    dir = opendir (subfolder_directory_path);

    if (dir == NULL) {
        g_free (subfolder_directory_path);
        return FALSE;
    }

    while (1) {
        struct stat file_stat;
        struct dirent *dirent;
        char *file_path;
        char *new_path;

        dirent = readdir (dir);
        if (dirent == NULL)
            break;

        if (strcmp (dirent->d_name, ".") == 0 || strcmp (dirent->d_name, "..") == 0)
            continue;

        file_path = g_concat_dir_and_file (subfolder_directory_path,
                           dirent->d_name);

        if (stat (file_path, &file_stat) < 0) {
            g_free (file_path);
            continue;
        }
        if (! S_ISDIR (file_stat.st_mode)) {
            g_free (file_path);
            continue;
        }

        new_path = g_concat_dir_and_file (path, dirent->d_name);

        load_folders (local_storage, path, new_path, file_path);

        g_free (file_path);
        g_free (new_path);
    }

    closedir (dir);
    g_free (subfolder_directory_path);

    return TRUE;
}

static gboolean
load_all_folders (ELocalStorage *local_storage)
{
    const char *base_path;

    base_path = e_local_storage_get_base_path (local_storage);

    return load_folders (local_storage, NULL, G_DIR_SEPARATOR_S, base_path);
}

static EStorageResult
errno_to_storage_result (void)
{
    EStorageResult storage_result;

    switch (errno) {
    case EACCES:
    case EROFS:
        storage_result = E_STORAGE_PERMISSIONDENIED;
        break;
    case EEXIST:
        storage_result = E_STORAGE_EXISTS;
        break;
    case ENOSPC:
        storage_result = E_STORAGE_NOSPACE;
        break;
    default:
        storage_result = E_STORAGE_GENERICERROR;
    }

    return storage_result;
}

static EStorageResult
shell_component_result_to_storage_result (EvolutionShellComponentResult result)
{
    /* FIXME: Maybe we need better mapping here.  */
    switch (result) {
    case EVOLUTION_SHELL_COMPONENT_OK:
        return E_STORAGE_OK;
    case EVOLUTION_SHELL_COMPONENT_NOTFOUND:
        return E_STORAGE_NOTFOUND;
    case EVOLUTION_SHELL_COMPONENT_UNSUPPORTEDTYPE:
        return E_STORAGE_UNSUPPORTEDTYPE;
    case EVOLUTION_SHELL_COMPONENT_UNSUPPORTEDOPERATION:
        return E_STORAGE_UNSUPPORTEDOPERATION;
    case EVOLUTION_SHELL_COMPONENT_EXISTS:
        return E_STORAGE_EXISTS;
    case EVOLUTION_SHELL_COMPONENT_PERMISSIONDENIED:
        return E_STORAGE_PERMISSIONDENIED;
    case EVOLUTION_SHELL_COMPONENT_ALREADYOWNED:
    case EVOLUTION_SHELL_COMPONENT_BUSY:
    case EVOLUTION_SHELL_COMPONENT_CORBAERROR:
    case EVOLUTION_SHELL_COMPONENT_HASSUBFOLDERS:
    case EVOLUTION_SHELL_COMPONENT_INTERNALERROR:
    case EVOLUTION_SHELL_COMPONENT_INTERRUPTED:
    case EVOLUTION_SHELL_COMPONENT_INVALIDARG:
    case EVOLUTION_SHELL_COMPONENT_INVALIDURI:
    case EVOLUTION_SHELL_COMPONENT_NOSPACE:
    case EVOLUTION_SHELL_COMPONENT_NOTOWNED:
    case EVOLUTION_SHELL_COMPONENT_UNKNOWNERROR:
    default:
        return E_STORAGE_GENERICERROR;
    }
}


/* Callbacks for the async methods invoked on the `Evolution::ShellComponent's.  */

struct _AsyncCreateFolderCallbackData {
    EStorage *storage;

    char *path;
    char *display_name;
    char *type;
    char *description;
    char *physical_uri;
    char *physical_path;

    EStorageResultCallback callback;
    void *callback_data;
};
typedef struct _AsyncCreateFolderCallbackData AsyncCreateFolderCallbackData;

static void
component_async_create_folder_callback (EvolutionShellComponentClient *shell_component_client,
                    EvolutionShellComponentResult result,
                    void *data)
{
    AsyncCreateFolderCallbackData *callback_data;

    callback_data = (AsyncCreateFolderCallbackData *) data;

    if (result != EVOLUTION_SHELL_COMPONENT_OK) {
        /* XXX: This assumes the component won't leave any files in the directory.  */
        rmdir (callback_data->physical_path);
    } else {
        EFolder *folder;

        folder = e_local_folder_new (callback_data->display_name,
                         callback_data->type,
                         callback_data->description);

        e_folder_set_physical_uri (folder, callback_data->physical_uri);

        if (e_local_folder_save (E_LOCAL_FOLDER (folder))) {
            e_storage_new_folder (callback_data->storage,
                          callback_data->path,
                          folder);
        } else {
            rmdir (callback_data->physical_path);
            gtk_object_unref (GTK_OBJECT (folder));
            result = E_STORAGE_IOERROR;
        }
    }

    bonobo_object_unref (BONOBO_OBJECT (shell_component_client));

    (* callback_data->callback) (callback_data->storage,
                     shell_component_result_to_storage_result (result),
                     callback_data->callback_data);

    g_free (callback_data->path);
    g_free (callback_data->display_name);
    g_free (callback_data->type);
    g_free (callback_data->description);
    g_free (callback_data->physical_uri);
    g_free (callback_data->physical_path);
    g_free (callback_data);
}


/* GtkObject methods.  */

static void
impl_destroy (GtkObject *object)
{
    ELocalStorage *local_storage;
    ELocalStoragePrivate *priv;

    local_storage = E_LOCAL_STORAGE (object);
    priv = local_storage->priv;

    g_free (priv->base_path);

    if (priv->folder_type_registry != NULL)
        gtk_object_unref (GTK_OBJECT (priv->folder_type_registry));
    
    g_free (priv);

    (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}


/* EStorage methods.  */

static const char *
impl_get_name (EStorage *storage)
{
    /* FIXME this sucks.  */
    return "local";
}

static void
impl_async_create_folder (EStorage *storage,
              const char *path,
              const char *type,
              const char *description,
              EStorageResultCallback callback,
              void *data)
{
    ELocalStorage *local_storage;
    ELocalStoragePrivate *priv;
    EvolutionShellComponentClient *component_client;
    const char *folder_name;
    AsyncCreateFolderCallbackData *callback_data;
    char *physical_path;
    char *physical_uri;
    char *parent_path;

    local_storage = E_LOCAL_STORAGE (storage);
    priv = local_storage->priv;

    component_client = e_folder_type_registry_get_handler_for_type (priv->folder_type_registry,
                                    type);
    if (component_client == NULL) {
        (* callback) (storage, E_STORAGE_INVALIDTYPE, data);
        return;
    }

    g_assert (g_path_is_absolute (path));

    folder_name = g_basename (path);
    if (folder_name == path + 1) {
        /* We want a direct child of the root, so we don't need to create a
           `subfolders' directory.  */
        physical_path = get_physical_path (local_storage, path);
        parent_path = g_strdup (G_DIR_SEPARATOR_S);
    } else {
        char *parent_physical_path;
        char *subfolders_directory_physical_path;

        /* Create the `subfolders' subdirectory under the parent.  */

        parent_path = g_strndup (path, folder_name - path - 1);
        parent_physical_path = get_physical_path (local_storage, parent_path);
        subfolders_directory_physical_path = g_concat_dir_and_file (parent_physical_path,
                                        SUBFOLDER_DIR_NAME);

        if (! g_file_exists (subfolders_directory_physical_path)
            && mkdir (subfolders_directory_physical_path, 0700) == -1) {
            g_free (parent_path);
            g_free (subfolders_directory_physical_path);
            g_free (parent_physical_path);

            (* callback) (storage, errno_to_storage_result (), data);
            return;
        }

        physical_path = g_concat_dir_and_file (subfolders_directory_physical_path,
                               folder_name);
        g_free (subfolders_directory_physical_path);
        g_free (parent_physical_path);
    }

    /* Create the directory that holds the folder.  */

    if (mkdir (physical_path, 0700) == -1) {
        g_free (physical_path);
        (* callback) (storage, errno_to_storage_result (), data);
        return;
    }

    /* Finally tell the component to do the job of creating the physical files in
           it. */
    /* FIXME: We should put the operations on a queue so that we can cancel them when
           the ELocalStorage is destroyed.  */

    physical_uri = g_strconcat ("file://", physical_path, NULL);

    callback_data = g_new (AsyncCreateFolderCallbackData, 1);
    callback_data->storage       = storage;
    callback_data->path          = g_strdup (path);
    callback_data->display_name  = g_strdup (folder_name);
    callback_data->type          = g_strdup (type);
    callback_data->description   = g_strdup (description);
    callback_data->physical_uri  = physical_uri;
    callback_data->physical_path = physical_path;
    callback_data->callback      = callback;
    callback_data->callback_data = data;

    bonobo_object_ref (BONOBO_OBJECT (component_client));

    evolution_shell_component_client_async_create_folder (component_client,
                                  physical_path,
                                  type,
                                  component_async_create_folder_callback,
                                  callback_data);
}

static void
impl_async_remove_folder (EStorage *storage,
              const char *path,
              EStorageResultCallback callback,
              void *data)
{
    ELocalStorage *local_storage;

    local_storage = E_LOCAL_STORAGE (storage);
}


/* Initialization.  */

static void
class_init (ELocalStorageClass *class)
{
    EStorageClass *storage_class;
    GtkObjectClass *object_class;

    parent_class  = gtk_type_class (e_storage_get_type ());
    object_class  = GTK_OBJECT_CLASS (class);
    storage_class = E_STORAGE_CLASS (class);

    object_class->destroy              = impl_destroy;

    storage_class->get_name            = impl_get_name;
    storage_class->async_create_folder = impl_async_create_folder;
    storage_class->async_remove_folder = impl_async_remove_folder;
}

static void
init (ELocalStorage *local_storage)
{
    ELocalStoragePrivate *priv;

    priv = g_new (ELocalStoragePrivate, 1);

    priv->base_path          = NULL;
    priv->folder_type_registry = NULL;

    local_storage->priv = priv;
}


static gboolean
construct (ELocalStorage *local_storage,
       EFolderTypeRegistry *folder_type_registry,
       const char *base_path)
{
    ELocalStoragePrivate *priv;
    int base_path_len;

    e_storage_construct (E_STORAGE (local_storage));

    priv = local_storage->priv;

    base_path_len = strlen (base_path);
    while (base_path_len > 0 && base_path[base_path_len - 1] == G_DIR_SEPARATOR)
        base_path_len--;

    g_return_val_if_fail (base_path_len != 0, FALSE);

    g_assert (priv->folder_type_registry == NULL);
    gtk_object_ref (GTK_OBJECT (folder_type_registry));
    priv->folder_type_registry = folder_type_registry;

    g_assert (priv->base_path == NULL);
    priv->base_path = g_strndup (base_path, base_path_len);

    return load_all_folders (local_storage);
}

EStorage *
e_local_storage_open (EFolderTypeRegistry *folder_type_registry,
              const char *base_path)
{
    EStorage *new;

    g_return_val_if_fail (folder_type_registry != NULL, NULL);
    g_return_val_if_fail (E_IS_FOLDER_TYPE_REGISTRY (folder_type_registry), NULL);
    g_return_val_if_fail (base_path != NULL, NULL);

    new = gtk_type_new (e_local_storage_get_type ());

    if (! construct (E_LOCAL_STORAGE (new), folder_type_registry, base_path)) {
        gtk_object_unref (GTK_OBJECT (new));
        return NULL;
    }

    return new;
}

const char *
e_local_storage_get_base_path (ELocalStorage *local_storage)
{
    g_return_val_if_fail (local_storage != NULL, NULL);
    g_return_val_if_fail (E_IS_LOCAL_STORAGE (local_storage), NULL);

    return local_storage->priv->base_path;
}


E_MAKE_TYPE (e_local_storage, "ELocalStorage", ELocalStorage, class_init, init, PARENT_TYPE)