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

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

/*
 *  Authors: Jeffrey Stedfast <fejj@helixcode.com>
 *
 *  Copyright 2000 Helix Code, Inc. (www.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 Street #330, Boston, MA 02111-1307, USA.
 *
 */


#include <config.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include <gal/util/e-util.h>

#include "camel-imap-store.h"
#include "camel-imap-auth.h"
#include "camel-imap-folder.h"
#include "camel-imap-utils.h"
#include "camel-imap-command.h"
#include "camel-folder.h"
#include "camel-exception.h"
#include "camel-session.h"
#include "camel-stream.h"
#include "camel-stream-buffer.h"
#include "camel-stream-fs.h"
#include "camel-url.h"
#include "string-utils.h"

#define d(x) x

/* Specified in RFC 2060 */
#define IMAP_PORT 143

static CamelRemoteStoreClass *remote_store_class = NULL;

static gboolean imap_connect (CamelService *service, CamelException *ex);
static gboolean imap_disconnect (CamelService *service, gboolean clean, CamelException *ex);
static GList *query_auth_types_generic (CamelService *service, CamelException *ex);
static GList *query_auth_types_connected (CamelService *service, CamelException *ex);
static CamelFolder *get_folder (CamelStore *store, const char *folder_name, guint32 flags, CamelException *ex);
static char *get_folder_name (CamelStore *store, const char *folder_name,
                  CamelException *ex);
static char *get_root_folder_name (CamelStore *store, CamelException *ex);
static CamelFolderInfo *get_folder_info (CamelStore *store, const char *top,
                     gboolean fast, gboolean recursive,
                     gboolean subscribed_only,
                     CamelException *ex);
static gboolean folder_subscribed (CamelStore *store, const char *folder_name);
static void subscribe_folder (CamelStore *store, const char *folder_name,
                  CamelException *ex);
static void unsubscribe_folder (CamelStore *store, const char *folder_name,
                CamelException *ex);
static void imap_keepalive (CamelRemoteStore *store);

static void
camel_imap_store_class_init (CamelImapStoreClass *camel_imap_store_class)
{
    /* virtual method overload */
    CamelServiceClass *camel_service_class =
        CAMEL_SERVICE_CLASS (camel_imap_store_class);
    CamelStoreClass *camel_store_class =
        CAMEL_STORE_CLASS (camel_imap_store_class);
    CamelRemoteStoreClass *camel_remote_store_class =
        CAMEL_REMOTE_STORE_CLASS (camel_imap_store_class);
    
    remote_store_class = CAMEL_REMOTE_STORE_CLASS(camel_type_get_global_classfuncs 
                              (camel_remote_store_get_type ()));
    
    /* virtual method overload */
    camel_service_class->query_auth_types_generic = query_auth_types_generic;
    camel_service_class->query_auth_types_connected = query_auth_types_connected;
    camel_service_class->connect = imap_connect;
    camel_service_class->disconnect = imap_disconnect;
    
    camel_store_class->get_folder = get_folder;
    camel_store_class->get_folder_name = get_folder_name;
    camel_store_class->get_root_folder_name = get_root_folder_name;
    camel_store_class->get_folder_info = get_folder_info;
    camel_store_class->free_folder_info = camel_store_free_folder_info_full;

    camel_store_class->folder_subscribed = folder_subscribed;
    camel_store_class->subscribe_folder = subscribe_folder;
    camel_store_class->unsubscribe_folder = unsubscribe_folder;

    camel_remote_store_class->keepalive = imap_keepalive;
}

static gboolean
free_sub (gpointer key, gpointer value, gpointer user_data)
{
    g_free (key);
    return TRUE;
}

static void
camel_imap_store_finalize (CamelObject *object)
{
    CamelImapStore *imap_store = CAMEL_IMAP_STORE (object);

    g_hash_table_foreach_remove (imap_store->subscribed_folders,
                     free_sub, NULL);
    g_hash_table_destroy (imap_store->subscribed_folders);
}

static void
camel_imap_store_init (gpointer object, gpointer klass)
{
    CamelRemoteStore *remote_store = CAMEL_REMOTE_STORE (object);
    CamelImapStore *imap_store = CAMEL_IMAP_STORE (object);
    CamelStore *store = CAMEL_STORE (object);
    
    remote_store->default_port = 143;

    imap_store->dir_sep = '\0';
    imap_store->current_folder = NULL;

    store->flags = CAMEL_STORE_SUBSCRIPTIONS;
    
    imap_store->connected = FALSE;
    imap_store->subscribed_folders = g_hash_table_new (g_str_hash, g_str_equal);
}

CamelType
camel_imap_store_get_type (void)
{
    static CamelType camel_imap_store_type = CAMEL_INVALID_TYPE;
    
    if (camel_imap_store_type == CAMEL_INVALID_TYPE)    {
        camel_imap_store_type =
            camel_type_register (CAMEL_REMOTE_STORE_TYPE, "CamelImapStore",
                         sizeof (CamelImapStore),
                         sizeof (CamelImapStoreClass),
                         (CamelObjectClassInitFunc) camel_imap_store_class_init,
                         NULL,
                         (CamelObjectInitFunc) camel_imap_store_init,
                         (CamelObjectFinalizeFunc) camel_imap_store_finalize);
    }
    
    return camel_imap_store_type;
}

static struct {
    const char *name;
    guint32 flag;
} capabilities[] = {
    { "IMAP4",      IMAP_CAPABILITY_IMAP4 },
    { "IMAP4REV1",      IMAP_CAPABILITY_IMAP4REV1 },
    { "STATUS",     IMAP_CAPABILITY_STATUS },
    { "NAMESPACE",      IMAP_CAPABILITY_NAMESPACE },
    { "AUTH=KERBEROS_V4",   IMAP_CAPABILITY_AUTH_KERBEROS_V4 },
    { "AUTH=GSSAPI",    IMAP_CAPABILITY_AUTH_GSSAPI },
    { "UIDPLUS",        IMAP_CAPABILITY_UIDPLUS },
    { "LITERAL+",       IMAP_CAPABILITY_LITERALPLUS },
    { NULL, 0 }
};

static gboolean
connect_to_server (CamelService *service, CamelException *ex)
{
    CamelImapStore *store = CAMEL_IMAP_STORE (service);
    CamelImapResponse *response;
    char *result, *buf, *capa, *lasts;
    int i;

    if (!CAMEL_SERVICE_CLASS (remote_store_class)->connect (service, ex))
        return FALSE;

    store->command = 0;

    /* Read the greeting, if any. FIXME: deal with PREAUTH */
    if (camel_remote_store_recv_line (CAMEL_REMOTE_STORE (service),
                      &buf, ex) < 0) {
        return FALSE;
    }
    g_free (buf);
    store->connected = TRUE;
    
    /* Find out the IMAP capabilities */
    store->capabilities = 0;
    response = camel_imap_command (store, NULL, ex, "CAPABILITY");
    if (!response)
        return FALSE;
    result = camel_imap_response_extract (response, "CAPABILITY", ex);
    if (!result)
        return FALSE;

    /* Skip over "* CAPABILITY". */
    capa = imap_next_word (result + 2);

    for (capa = strtok_r (capa, " ", &lasts); capa;
         capa = strtok_r (NULL, " ", &lasts)) {
        for (i = 0; capabilities[i].name; i++) {
            if (g_strcasecmp (capa, capabilities[i].name) == 0) {
                store->capabilities |= capabilities[i].flag;
                break;
            }
        }
    }
    g_free (result);

    if (store->capabilities & IMAP_CAPABILITY_IMAP4REV1) {
        store->server_level = IMAP_LEVEL_IMAP4REV1;
        store->capabilities |= IMAP_CAPABILITY_STATUS;
    } else if (store->capabilities & IMAP_CAPABILITY_IMAP4)
        store->server_level = IMAP_LEVEL_IMAP4;
    else
        store->server_level = IMAP_LEVEL_UNKNOWN;

    return TRUE;
}

static CamelServiceAuthType password_authtype = {
    N_("Password"),
    
    N_("This option will connect to the IMAP server using a "
       "plaintext password."),
    
    "",
    TRUE
};

#ifdef HAVE_KRB4
static CamelServiceAuthType kerberos_v4_authtype = {
    N_("Kerberos 4"),

    N_("This option will connect to the IMAP server using "
       "Kerberos 4 authentication."),

    "KERBEROS_V4",
    FALSE
};
#endif

static GList *
query_auth_types_connected (CamelService *service, CamelException *ex)
{
    GList *types;

    if (!connect_to_server (service, ex))
        return NULL;

    types = CAMEL_SERVICE_CLASS (remote_store_class)->query_auth_types_connected (service, ex);
#ifdef HAVE_KRB4
    if (CAMEL_IMAP_STORE (service)->capabilities &
        IMAP_CAPABILITY_AUTH_KERBEROS_V4)
        types = g_list_prepend (types, &kerberos_v4_authtype);
#endif
    return g_list_prepend (types, &password_authtype);
}

static GList *
query_auth_types_generic (CamelService *service, CamelException *ex)
{
    GList *types;
    
    types = CAMEL_SERVICE_CLASS (remote_store_class)->query_auth_types_generic (service, ex);
#ifdef HAVE_KRB4
    types = g_list_prepend (types, &kerberos_v4_authtype);
#endif
    return g_list_prepend (types, &password_authtype);
}

static gboolean
imap_connect (CamelService *service, CamelException *ex)
{
    CamelImapStore *store = CAMEL_IMAP_STORE (service);
    CamelSession *session = camel_service_get_session (CAMEL_SERVICE (store));
    gchar *result, *errbuf = NULL, *namespace;
    CamelImapResponse *response;
    gboolean authenticated = FALSE;
    int len;

    if (connect_to_server (service, ex) == 0)
        return FALSE;
    
    /* authenticate the user */
#ifdef HAVE_KRB4
    if (service->url->authmech &&
        !g_strcasecmp (service->url->authmech, "KERBEROS_V4")) {
        if (!(store->capabilities & IMAP_CAPABILITY_AUTH_KERBEROS_V4)) {
            camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_CANT_AUTHENTICATE,
                          "IMAP server %s does not "
                          "support requested "
                          "authentication type %s",
                          service->url->host,
                          service->url->authmech);
            camel_service_disconnect (service, TRUE, NULL);
            return FALSE;
        }

        authenticated = imap_try_kerberos_v4_auth (store, ex);
        if (camel_exception_is_set (ex)) {
            camel_service_disconnect (service, TRUE, NULL);
            return FALSE;
        }
    }
#endif

    while (!authenticated) {
        if (errbuf) {
            /* We need to un-cache the password before prompting again */
            camel_session_query_authenticator (
                session, CAMEL_AUTHENTICATOR_TELL, NULL,
                TRUE, service, "password", ex);
            g_free (service->url->passwd);
            service->url->passwd = NULL;
        }

        if (!service->url->authmech && !service->url->passwd) {
            char *prompt;

            prompt = g_strdup_printf (_("%sPlease enter the IMAP "
                            "password for %s@%s"),
                          errbuf ? errbuf : "",
                          service->url->user,
                          service->url->host);
            service->url->passwd =
                camel_session_query_authenticator (
                    session, CAMEL_AUTHENTICATOR_ASK,
                    prompt, TRUE, service, "password", ex);
            g_free (prompt);
            g_free (errbuf);
            errbuf = NULL;

            if (!service->url->passwd) {
                camel_exception_set (ex, CAMEL_EXCEPTION_USER_CANCEL,
                             "You didn\'t enter a password.");
                camel_service_disconnect (service, TRUE, NULL);
                return FALSE;
            }
        }

        response = camel_imap_command (store, NULL, ex,
                           "LOGIN %S %S",
                           service->url->user,
                           service->url->passwd);
        if (!response) {
            errbuf = g_strdup_printf (_("Unable to authenticate "
                            "to IMAP server.\n%s\n\n"),
                          camel_exception_get_description (ex));
            camel_exception_clear (ex);
        } else {
            authenticated = TRUE;
            camel_imap_response_free (response);
        }
    }

    /* Find our storage path. */
    if (!store->storage_path) {
        store->storage_path =
            camel_session_get_storage_path (session, service, ex);
        if (camel_exception_is_set (ex)) 
            return FALSE;
    }

    /* Find the hierarchy separator for our namespace. */
    namespace = service->url->path;
    if (namespace)
        namespace++;
    else
        namespace = "";
    if (store->server_level >= IMAP_LEVEL_IMAP4REV1) {
        /* This idiom means "tell me the hierarchy separator
         * for the given path, even if that path doesn't exist.
         */
        response = camel_imap_command (store, NULL, ex,
                           "LIST %S \"\"",
                           namespace);
    } else {
        /* Plain IMAP4 doesn't have that idiom, so we fall back
         * to "tell me about this folder", which will fail if
         * the folder doesn't exist (eg, if namespace is "").
         */
        response = camel_imap_command (store, NULL, ex,
                           "LIST \"\" %S",
                           namespace);
    }
        if (!response)
        return FALSE;

    result = camel_imap_response_extract (response, "LIST", NULL);
    if (result) {
        imap_parse_list_response (result, NULL, &store->dir_sep, NULL);
        g_free (result);
    }
    if (!store->dir_sep)
        store->dir_sep = '/';   /* Guess */

    /* Generate base URL */
    store->base_url = camel_url_to_string (service->url, FALSE);
    len = strlen (store->base_url);
    if (service->url->path)
        store->base_url[len - strlen (service->url->path) + 1] = '\0';
    else {
        store->base_url = g_realloc (store->base_url, len + 2);
        store->base_url[len] = '/';
        store->base_url[len + 1] = '\0';
    }

    camel_remote_store_refresh_folders (CAMEL_REMOTE_STORE (store), ex);

    return !camel_exception_is_set (ex);
}

static gboolean
imap_disconnect (CamelService *service, gboolean clean, CamelException *ex)
{
    CamelImapStore *store = CAMEL_IMAP_STORE (service);
    CamelImapResponse *response;
    
    if (store->connected && clean) {
        /* send the logout command */
        response = camel_imap_command (store, NULL, ex, "LOGOUT");
        camel_imap_response_free (response);
    }
    
    store->current_folder = NULL;
    
    return CAMEL_SERVICE_CLASS (remote_store_class)->disconnect (service, clean, ex);
}

static gboolean
imap_folder_exists (CamelImapStore *store, const char *folder_name,
            gboolean *selectable, char **short_name,
            CamelException *ex)
{
    CamelImapResponse *response;
    char *result, sep;
    int flags;

    if (!g_strcasecmp (folder_name, "INBOX")) {
        if (selectable)
            *selectable = TRUE;
        if (short_name)
            *short_name = g_strdup ("INBOX");
        return TRUE;
    }

    response = camel_imap_command (store, NULL, ex, "LIST \"\" %S",
                       folder_name);
    if (!response)
        return FALSE;
    result = camel_imap_response_extract (response, "LIST", ex);
    if (!result)
        return FALSE;

    if (!imap_parse_list_response (result, &flags, &sep, NULL))
        return FALSE;

    if (selectable)
        *selectable = !(flags & IMAP_LIST_FLAG_NOSELECT);
    if (short_name) {
        *short_name = strrchr (folder_name, sep);
        if (*short_name)
            *short_name = g_strdup (*short_name + 1);
        else
            *short_name = g_strdup (folder_name);
    }

    return TRUE;
}

static gboolean
imap_create (CamelImapStore *store, const char *folder_name,
         CamelException *ex)
{
    CamelImapResponse *response;

    response = camel_imap_command (store, NULL, ex, "CREATE %S",
                       folder_name);
    camel_imap_response_free (response);

    return !camel_exception_is_set (ex);
}

static CamelFolder *
get_folder (CamelStore *store, const char *folder_name, guint32 flags,
        CamelException *ex)
{
    CamelImapStore *imap_store = CAMEL_IMAP_STORE (store);
    CamelFolder *new_folder = NULL;
    char *short_name, *summary_file, *p;
    gboolean selectable;

    if (!imap_folder_exists (imap_store, folder_name,
                 &selectable, &short_name, ex)) {
        if ((flags & CAMEL_STORE_FOLDER_CREATE) == 0)
            return NULL;

        if (!imap_create (imap_store, folder_name, ex))
            return NULL;

        if (!imap_folder_exists (imap_store, folder_name,
                     &selectable, &short_name, ex))
            return NULL;
    }

    if (!selectable) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_STORE_NO_FOLDER,
                      "%s is not a selectable folder",
                      folder_name);
        g_free (short_name);
        return NULL;
    }

    summary_file = g_strdup_printf ("%s/%s/#summary",
                    imap_store->storage_path,
                    folder_name);
    p = strrchr (summary_file, '/');
    *p = '\0';
    if (e_mkdir_hier (summary_file, S_IRWXU) == 0) {
        *p = '/';
        new_folder = camel_imap_folder_new (store, folder_name,
                            short_name, summary_file,
                            ex);
    } else {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Could not create directory %s: %s"),
                      summary_file, g_strerror (errno));
    }
    g_free (summary_file);
    g_free (short_name);

    if (camel_exception_is_set (ex))
        return NULL;

    return new_folder;
}

static char *
get_folder_name (CamelStore *store, const char *folder_name,
         CamelException *ex)
{
    /* INBOX is case-insensitive */
    if (g_strcasecmp (folder_name, "INBOX") == 0)
        return g_strdup ("INBOX");
    else
        return g_strdup (folder_name);
}

static char *
get_root_folder_name (CamelStore *store, CamelException *ex)
{
    return g_strdup ("");
}

static CamelFolderInfo *
parse_list_response_as_folder_info (CamelImapStore *imap_store,
                    const char *response)
{
    CamelFolderInfo *fi;
    int flags;
    char sep, *dir, *name = NULL;

    if (!imap_parse_list_response (response, &flags, &sep, &dir))
        return NULL;

    if (sep) {
        name = strrchr (dir, sep);
        if (name && !*++name) {
            g_free (dir);
            return NULL;
        }
    }

    fi = g_new0 (CamelFolderInfo, 1);
    fi->full_name = dir;
    if (sep && name)
        fi->name = g_strdup (name);
    else
        fi->name = g_strdup (dir);
    if (!(flags & IMAP_LIST_FLAG_NOSELECT))
        fi->url = g_strdup_printf ("%s%s", imap_store->base_url, dir);

    return fi;
}

static CamelFolderInfo *
get_folder_info (CamelStore *store, const char *top, gboolean fast,
         gboolean recursive, gboolean subscribed_only,
         CamelException *ex)
{
    CamelImapStore *imap_store = CAMEL_IMAP_STORE (store);
    CamelURL *url = CAMEL_SERVICE (store)->url;
    gboolean need_inbox = FALSE;
    int i;
    CamelImapResponse *response;
    GPtrArray *folders;
    const char *name;
    char *pattern, *list;
    char *status;
    const char *p;
    CamelFolderInfo *topfi, *fi;

    name = top;
    if (!name) {
        need_inbox = TRUE;
        if (url->path)
            name = url->path + 1;
        else
            name = "";
    }
    response = camel_imap_command (imap_store, NULL, ex,
                       "LIST \"\" %S", name);
    if (!response)
        return FALSE;
    list = camel_imap_response_extract (response, "LIST", ex);
    if (!list)
        return FALSE;
    topfi = parse_list_response_as_folder_info (imap_store, list);
    g_free (list);
    if (!topfi) {
        topfi = g_new0 (CamelFolderInfo, 1);
        topfi->full_name = g_strdup (name);
        topfi->name = g_strdup (name);
    }

    if (*name)
        pattern = g_strdup_printf ("%s%c%c", name, imap_store->dir_sep,
                       recursive ? '*' : '%');
    else
        pattern = g_strdup_printf ("%s%c", name,
                       recursive ? '*' : '%');
    response = camel_imap_command (imap_store, NULL, ex,
                       "%s \"\" %S",
                       subscribed_only ? "LSUB" : "LIST",
                       pattern);
    g_free (pattern);
    if (!response)
        return NULL;

    if (subscribed_only) {
        g_hash_table_foreach_remove (imap_store->subscribed_folders,
                         free_sub, NULL);
    }

    /* Turn responses into CamelFolderInfo and remove any
     * extraneous responses.
     */
    folders = g_ptr_array_new ();
    for (i = 0; i < response->untagged->len; i++) {
        list = response->untagged->pdata[i];
        fi = parse_list_response_as_folder_info (imap_store, list);
        if (!fi)
            continue;
        g_ptr_array_add (folders, fi);

        if (subscribed_only) {
            g_hash_table_insert (imap_store->subscribed_folders,
                         g_strdup (fi->full_name),
                         GUINT_TO_POINTER (1));
        }

        if (!g_strcasecmp (fi->full_name, "INBOX"))
            need_inbox = FALSE;
    }
    camel_imap_response_free (response);

    /* Add INBOX, if necessary */
    if (need_inbox) {
        fi = g_new0 (CamelFolderInfo, 1);
        fi->full_name = g_strdup ("INBOX");
        fi->name = g_strdup ("INBOX");
        fi->url = g_strdup_printf ("%sINBOX", imap_store->base_url);

        g_ptr_array_add (folders, fi);
    }

    if (!fast) {
        /* Get read/unread counts */
        for (i = 0; i < folders->len; i++) {
            fi = folders->pdata[i];
            if (!fi->url)
                continue;

            response = camel_imap_command (
                imap_store, NULL, NULL,
                "STATUS %S (MESSAGES UNSEEN)",
                fi->full_name);
            if (!response)
                continue;
            status = camel_imap_response_extract (
                response, "STATUS", NULL);
            if (!status)
                continue;

            p = e_strstrcase (status, "MESSAGES");
            if (p)
                fi->message_count = strtoul (p + 8, NULL, 10);
            p = e_strstrcase (status, "UNSEEN");
            if (p)
                fi->unread_message_count = strtoul (p + 6, NULL, 10);
            g_free (status);
        }
    }

    /* And assemble */
    camel_folder_info_build (folders, topfi, imap_store->dir_sep, TRUE);
    g_ptr_array_free (folders, TRUE);

    /* If this is the root of the store, prune off any namespace. */
    if (!top && !topfi->sibling) {
        int toplen = strlen (name), len;

        while (!topfi->sibling) {
            len = strlen (topfi->full_name);
            if (len > toplen ||
                strncmp (topfi->full_name, name, len) != 0)
                break;

            fi = topfi;
            topfi = topfi->child;
            fi->child = NULL;
            camel_folder_info_free (fi);
            for (fi = topfi; fi; fi = fi->sibling)
                fi->parent = NULL;
        }
    }

    return topfi;
}

static gboolean
folder_subscribed (CamelStore *store, const char *folder_name)
{
    CamelImapStore *imap_store = CAMEL_IMAP_STORE (store);

    return g_hash_table_lookup (imap_store->subscribed_folders,
                    folder_name) != NULL;
}

static void
subscribe_folder (CamelStore *store, const char *folder_name,
          CamelException *ex)
{
    CamelImapStore *imap_store = CAMEL_IMAP_STORE (store);
    CamelImapResponse *response;

    response = camel_imap_command (imap_store, NULL, ex,
                       "SUBSCRIBE %S", folder_name);
    if (response) {
        g_hash_table_insert (imap_store->subscribed_folders,
                     g_strdup (folder_name),
                     GUINT_TO_POINTER (1));
    }
    camel_imap_response_free (response);
}

static void
unsubscribe_folder (CamelStore *store, const char *folder_name,
            CamelException *ex)
{
    CamelImapStore *imap_store = CAMEL_IMAP_STORE (store);
    CamelImapResponse *response;
    gpointer key, value;

    response = camel_imap_command (imap_store, NULL, ex,
                       "UNSUBSCRIBE %S", folder_name);
    if (response) {
        g_hash_table_lookup_extended (imap_store->subscribed_folders,
                          folder_name, &key, &value);
        g_hash_table_remove (imap_store->subscribed_folders,
                     folder_name);
        g_free (key);
    }
    camel_imap_response_free (response);
}

static void
imap_keepalive (CamelRemoteStore *store)
{
    CamelImapStore *imap_store = CAMEL_IMAP_STORE (store);
    CamelImapResponse *response;

    response = camel_imap_command (imap_store, NULL, NULL, "NOOP");
    camel_imap_response_free (response);
}