path: root/camel/providers/imap4/camel-imap4-folder.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*  Camel
 *  Copyright (C) 1999-2004 Jeffrey Stedfast
 *
 *  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.
 */


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

#include <glib.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>

#include <camel/camel-utf8.h>
#include <camel/camel-private.h>
#include <camel/camel-file-utils.h>
#include <camel/camel-mime-message.h>
#include <camel/camel-stream-mem.h>
#include <camel/camel-stream-filter.h>
#include <camel/camel-mime-filter-crlf.h>

#include "camel-imap4-utils.h"
#include "camel-imap4-store.h"
#include "camel-imap4-engine.h"
#include "camel-imap4-folder.h"
#include "camel-imap4-stream.h"
#include "camel-imap4-command.h"
#include "camel-imap4-summary.h"

#define d(x) x

static void camel_imap4_folder_class_init (CamelIMAP4FolderClass *klass);
static void camel_imap4_folder_init (CamelIMAP4Folder *folder, CamelIMAP4FolderClass *klass);
static void camel_imap4_folder_finalize (CamelObject *object);

static void imap4_sync (CamelFolder *folder, gboolean expunge, CamelException *ex);
static void imap4_expunge (CamelFolder *folder, CamelException *ex);
static CamelMimeMessage *imap4_get_message (CamelFolder *folder, const char *uid, CamelException *ex);
static void imap4_append_message (CamelFolder *folder, CamelMimeMessage *message,
                  const CamelMessageInfo *info, char **appended_uid, CamelException *ex);
static void imap4_transfer_messages_to (CamelFolder *src, GPtrArray *uids, CamelFolder *dest,
                    GPtrArray **transferred_uids, gboolean delete_originals, CamelException *ex);


static CamelFolderClass *parent_class = NULL;


CamelType
camel_imap4_folder_get_type (void)
{
    static CamelType type = 0;
    
    if (!type) {
        type = camel_type_register (CAMEL_FOLDER_TYPE,
                        "CamelIMAP4Folder",
                        sizeof (CamelIMAP4Folder),
                        sizeof (CamelIMAP4FolderClass),
                        (CamelObjectClassInitFunc) camel_imap4_folder_class_init,
                        NULL,
                        (CamelObjectInitFunc) camel_imap4_folder_init,
                        (CamelObjectFinalizeFunc) camel_imap4_folder_finalize);
    }
    
    return type;
}

static void
camel_imap4_folder_class_init (CamelIMAP4FolderClass *klass)
{
    CamelFolderClass *folder_class = (CamelFolderClass *) klass;
    
    parent_class = (CamelFolderClass *) camel_type_get_global_classfuncs (CAMEL_FOLDER_TYPE);
    
    folder_class->sync = imap4_sync;
    folder_class->expunge = imap4_expunge;
    folder_class->get_message = imap4_get_message;
    folder_class->append_message = imap4_append_message;
    folder_class->transfer_messages_to = imap4_transfer_messages_to;
}

static void
camel_imap4_folder_init (CamelIMAP4Folder *folder, CamelIMAP4FolderClass *klass)
{
    folder->utf7_name = NULL;
    folder->cachedir = NULL;
}

static void
camel_imap4_folder_finalize (CamelObject *object)
{
    CamelIMAP4Folder *folder = (CamelIMAP4Folder *) object;
    
    g_free (folder->utf7_name);
    g_free (folder->cachedir);
}

static char *
imap_get_summary_filename (const char *path)
{
    /* /path/to/imap/summary */
    return g_build_filename (path, "summary", NULL);
}

static char *
imap_build_filename (const char *toplevel_dir, const char *full_name)
{
    const char *inptr = full_name;
    int subdirs = 0;
    char *path, *p;
    
    if (*full_name == '\0')
        return g_strdup (toplevel_dir);
    
    while (*inptr != '\0') {
        if (*inptr == '/')
            subdirs++;
        inptr++;
    }
    
    path = g_malloc (strlen (toplevel_dir) + (inptr - full_name) + (12 * subdirs) + 2);
    p = g_stpcpy (path, toplevel_dir);
    
    if (p[-1] != '/')
        *p++ = '/';
    
    inptr = full_name;
    while (*inptr != '\0') {
        while (*inptr != '/' && *inptr != '\0')
            *p++ = *inptr++;
        
        if (*inptr == '/') {
            p = g_stpcpy (p, "/subfolders/");
            inptr++;
            
            /* strip extranaeous '/'s */
            while (*inptr == '/')
                inptr++;
        }
    }
    
    *p = '\0';
    
    return path;
}

static char *
imap_store_build_filename (void *store, const char *full_name)
{
    CamelIMAP4Store *imap_store = (CamelIMAP4Store *) store;
    char *toplevel_dir;
    char *path;
    
    toplevel_dir = g_strdup_printf ("%s/folders", imap_store->storage_path);
    path = imap_build_filename (toplevel_dir, full_name);
    g_free (toplevel_dir);
    
    return path;
}

static char
imap4_get_path_delim (CamelIMAP4Engine *engine, const char *full_name)
{
    CamelIMAP4Namespace *namespace;
    const char *slash;
    size_t len;
    char *top;
    
    if ((slash = strchr (full_name, '/')))
        len = (slash - full_name);
    else
        len = strlen (full_name);
    
    top = g_alloca (len + 1);
    memcpy (top, full_name, len);
    top[len] = '\0';
    
    if (!g_ascii_strcasecmp (top, "INBOX"))
        top = "INBOX";
    
 retry:
    namespace = engine->namespaces.personal;
    while (namespace != NULL) {
        if (!strcmp (namespace->path, top))
            return namespace->sep;
        namespace = namespace->next;
    }
    
    namespace = engine->namespaces.other;
    while (namespace != NULL) {
        if (!strcmp (namespace->path, top))
            return namespace->sep;
        namespace = namespace->next;
    }
    
    namespace = engine->namespaces.shared;
    while (namespace != NULL) {
        if (!strcmp (namespace->path, top))
            return namespace->sep;
        namespace = namespace->next;
    }
    
    if (top[0] != '\0') {
        /* look for a default namespace? */
        top[0] = '\0';
        goto retry;
    }
    
    return '/';
}

CamelFolder *
camel_imap4_folder_new (CamelStore *store, const char *full_name, CamelException *ex)
{
    CamelIMAP4Folder *imap_folder;
    char *utf7_name, *name, *p;
    CamelFolder *folder;
    char *path;
    char sep;
    
    if (!(p = strrchr (full_name, '/')))
        p = (char *) full_name;
    else
        p++;
    
    name = g_alloca (strlen (p) + 1);
    strcpy (name, p);
    
    utf7_name = g_alloca (strlen (full_name) + 1);
    strcpy (utf7_name, full_name);
    
    sep = imap4_get_path_delim (((CamelIMAP4Store *) store)->engine, full_name);
    if (sep != '/') {
        p = utf7_name;
        while (*p != '\0') {
            if (*p == '/')
                *p = sep;
            p++;
        }
    }
    
    utf7_name = camel_utf8_utf7 (utf7_name);
    
    folder = (CamelFolder *) imap_folder = (CamelIMAP4Folder *) camel_object_new (CAMEL_TYPE_IMAP4_FOLDER);
    camel_folder_construct (folder, store, full_name, name);
    imap_folder->utf7_name = utf7_name;
    
    folder->summary = camel_imap4_summary_new (folder);
    imap_folder->cachedir = imap_store_build_filename (store, folder->full_name);
    camel_mkdir (imap_folder->cachedir, 0777);
    
    path = imap_get_summary_filename (imap_folder->cachedir);
    camel_folder_summary_set_filename (folder->summary, path);
    g_free (path);
    
    camel_folder_summary_load (folder->summary);
    
    if (camel_imap4_engine_select_folder (((CamelIMAP4Store *) store)->engine, folder, ex) == -1) {
        camel_object_unref (folder);
        folder = NULL;
    }
    
    if (camel_imap4_summary_flush_updates (folder->summary, ex) == -1) {
        camel_object_unref (folder);
        folder = NULL;
    }
    
    return folder;
}


const char *
camel_imap4_folder_utf7_name (CamelIMAP4Folder *folder)
{
    return folder->utf7_name;
}


static struct {
    const char *name;
    guint32 flag;
} imap4_flags[] = {
    { "\\Answered", CAMEL_MESSAGE_ANSWERED  },
    { "\\Deleted",  CAMEL_MESSAGE_DELETED   },
    { "\\Draft",    CAMEL_MESSAGE_DRAFT     },
    { "\\Flagged",  CAMEL_MESSAGE_FLAGGED   },
    /*{ "Forwarded",  CAMEL_MESSAGE_FORWARDED },*/
    { "\\Seen",     CAMEL_MESSAGE_SEEN      },
};

static int
imap4_get_uid_set (CamelIMAP4Engine *engine, CamelFolderSummary *summary, GPtrArray *infos, int cur, size_t linelen, char **set)
{
    CamelMessageInfo *info;
    guint32 this, prev, next;
    gboolean range = FALSE;
    GString *uidset;
    int scount, i;
    size_t len;
    
    if (engine->maxlentype == CAMEL_IMAP4_ENGINE_MAXLEN_LINE)
        len = engine->maxlen - linelen;
    else
        len = engine->maxlen;
    
    i = cur + 1;
    info = (CamelMessageInfo *) infos->pdata[cur];
    fflush (stdout);
    uidset = g_string_new ("");
    g_string_append (uidset, camel_message_info_uid (info));
    
    if (!(i < infos->len))
        goto done;
    
    scount = summary->messages->len;
    
    /* init this info */
    for (this = 0; this < scount; this++) {
        if (info == summary->messages->pdata[this])
            break;
    }
    
    /* init next info */
    info = (CamelMessageInfo *) infos->pdata[i];
    for (next = this; next < scount; next++) {
        if (info == summary->messages->pdata[next])
            break;
    }
    
    for ( ; i < infos->len && uidset->len < len; i++) {
        prev = this;
        this = next;
        
        if (i + 1 < infos->len) {
            info = infos->pdata[i + 1];
            for (next = this; next < scount; next++) {
                if (info == summary->messages->pdata[next])
                    break;
            }
        } else {
            next = scount;
        }
        
        if (this == (next - 1) || this == (prev + 1)) {
            range = TRUE;
        } else {
            if (range) {
                info = (CamelMessageInfo *) summary->messages->pdata[prev];
                g_string_append_printf (uidset, ":%s", camel_message_info_uid (info));
                range = FALSE;
            }
            
            info = infos->pdata[i];
            g_string_append_printf (uidset, ",%s", camel_message_info_uid (info));
        }
    }
    
    if (range) {
        info = (CamelMessageInfo *) summary->messages->pdata[this];
        g_string_append_printf (uidset, ":%s", camel_message_info_uid (info));
    }
    
 done:
    
    *set = uidset->str;
    g_string_free (uidset, FALSE);
    
    return (i - cur);
}

static int
imap4_sync_flag (CamelFolder *folder, GPtrArray *infos, char onoff, const char *flag, CamelException *ex)
{
    CamelIMAP4Engine *engine = ((CamelIMAP4Store *) folder->parent_store)->engine;
    CamelIMAP4Command *ic;
    int i, id, retval = 0;
    char *set = NULL;
    
    for (i = 0; i < infos->len; ) {
        i += imap4_get_uid_set (engine, folder->summary, infos, i, 30 + strlen (flag), &set);
        
        ic = camel_imap4_engine_queue (engine, folder, "UID STORE %s %cFLAGS.SILENT (%s)\r\n", set, onoff, flag);
        while ((id = camel_imap4_engine_iterate (engine)) < ic->id && id != -1)
            ;
        
        g_free (set);
        
        if (id == -1 || ic->status != CAMEL_IMAP4_COMMAND_COMPLETE) {
            camel_exception_xfer (ex, &ic->ex);
            camel_imap4_command_unref (ic);
            
            return -1;
        }
        
        switch (ic->result) {
        case CAMEL_IMAP4_RESULT_NO:
            /* FIXME: would be good to save the NO reason into the err message */
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("Cannot sync flags to folder `%s': Unknown"),
                          folder->full_name);
            retval = -1;
            break;
        case CAMEL_IMAP4_RESULT_BAD:
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("Cannot sync flags to folder `%s': Bad command"),
                          folder->full_name);
            retval = -1;
            break;
        }
        
        camel_imap4_command_unref (ic);
        
        if (retval == -1)
            return -1;
    }
    
    return 0;
}

static int
imap4_sync_changes (CamelFolder *folder, GPtrArray *sync, CamelException *ex)
{
    CamelIMAP4MessageInfo *iinfo;
    GPtrArray *on_set, *off_set;
    CamelMessageInfo *info;
    flags_diff_t diff;
    int retval = 0;
    int i, j;
    
    if (folder->permanent_flags == 0)
        return 0;
    
    on_set = g_ptr_array_new ();
    off_set = g_ptr_array_new ();
    
    /* construct commands to sync system and user flags */
    for (i = 0; i < G_N_ELEMENTS (imap4_flags); i++) {
        if (!(imap4_flags[i].flag & folder->permanent_flags))
            continue;
        
        for (j = 0; j < sync->len; j++) {
            iinfo = (CamelIMAP4MessageInfo *) info = sync->pdata[j];
            camel_imap4_flags_diff (&diff, iinfo->server_flags, info->flags);
            if (diff.changed & imap4_flags[i].flag) {
                if (diff.bits & imap4_flags[i].flag) {
                    g_ptr_array_add (on_set, info);
                } else {
                    g_ptr_array_add (off_set, info);
                }
            }
        }
        
        if (on_set->len > 0) {
            if ((retval = imap4_sync_flag (folder, on_set, '+', imap4_flags[i].name, ex)) == -1)
                break;
            
            g_ptr_array_set_size (on_set, 0);
        }
        
        if (off_set->len > 0) {
            if ((retval = imap4_sync_flag (folder, off_set, '-', imap4_flags[i].name, ex)) == -1)
                break;
            
            g_ptr_array_set_size (off_set, 0);
        }
    }
    
    g_ptr_array_free (on_set, TRUE);
    g_ptr_array_free (off_set, TRUE);
    
    if (retval == -1)
        return-1;
    
    for (i = 0; i < sync->len; i++) {
        iinfo = (CamelIMAP4MessageInfo *) info = sync->pdata[i];
        info->flags &= ~CAMEL_MESSAGE_FOLDER_FLAGGED;
        iinfo->server_flags = info->flags & folder->permanent_flags;
    }
    
    return 0;
}

static void
imap4_sync (CamelFolder *folder, gboolean expunge, CamelException *ex)
{
    CamelIMAP4Engine *engine = ((CamelIMAP4Store *) folder->parent_store)->engine;
    CamelIMAP4MessageInfo *iinfo;
    CamelMessageInfo *info;
    CamelIMAP4Command *ic;
    flags_diff_t diff;
    GPtrArray *sync;
    int id, max, i;
    int retval;
    
    CAMEL_SERVICE_LOCK (folder->parent_store, connect_lock);
    
    /* gather a list of changes to sync to the server */
    sync = g_ptr_array_new ();
    max = camel_folder_summary_count (folder->summary);
    for (i = 0; i < max; i++) {
        iinfo = (CamelIMAP4MessageInfo *) info = camel_folder_summary_index (folder->summary, i);
        expunge = expunge && (info->flags & CAMEL_MESSAGE_DELETED);
        if (info->flags & CAMEL_MESSAGE_FOLDER_FLAGGED) {
            camel_imap4_flags_diff (&diff, iinfo->server_flags, info->flags);
            diff.changed &= folder->permanent_flags;
            
            /* weed out flag changes that we can't sync to the server */
            if (!diff.changed)
                camel_folder_summary_info_free (folder->summary, info);
            else
                g_ptr_array_add (sync, info);
        } else {
            camel_folder_summary_info_free (folder->summary, info);
        }
    }
    
    if (sync->len > 0) {
        retval = imap4_sync_changes (folder, sync, ex);
        
        for (i = 0; i < sync->len; i++)
            camel_folder_summary_info_free (folder->summary, sync->pdata[i]);
        
        g_ptr_array_free (sync, TRUE);
        
        if (retval == -1)
            goto done;
    } else {
        g_ptr_array_free (sync, TRUE);
    }
    
    if (expunge) {
        ic = camel_imap4_engine_queue (engine, folder, "EXPUNGE\r\n");
        while ((id = camel_imap4_engine_iterate (engine)) < ic->id && id != -1)
            ;
        
        switch (ic->result) {
        case CAMEL_IMAP4_RESULT_NO:
            /* FIXME: would be good to save the NO reason into the err message */
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("Cannot expunge folder `%s': Unknown"),
                          folder->full_name);
            break;
        case CAMEL_IMAP4_RESULT_BAD:
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("Cannot expunge folder `%s': Bad command"),
                          folder->full_name);
            break;
        }
        
        camel_imap4_command_unref (ic);
    }
    
    camel_folder_summary_save (folder->summary);
    
 done:
    
    CAMEL_SERVICE_UNLOCK (folder->parent_store, connect_lock);
}

static void
imap4_expunge (CamelFolder *folder, CamelException *ex)
{
    imap4_sync (folder, TRUE, ex);
}


static int
untagged_fetch (CamelIMAP4Engine *engine, CamelIMAP4Command *ic, guint32 index, camel_imap4_token_t *token, CamelException *ex)
{
    CamelStream *fstream, *stream = ic->user_data;
    CamelMimeFilter *crlf;
    int left = 2;
    
    if (camel_imap4_engine_next_token (engine, token, ex) == -1)
        return -1;
    
    /* parse the FETCH response list */
    if (token->token != '(') {
        camel_imap4_utils_set_unexpected_token_error (ex, engine, token);
        return -1;
    }
    
    do {
        if (camel_imap4_engine_next_token (engine, token, ex) == -1)
            goto exception;
        
        if (token->token != CAMEL_IMAP4_TOKEN_ATOM)
            goto unexpected;
        
        if (!strcmp (token->v.atom, "BODY[")) {
            if (camel_imap4_engine_next_token (engine, token, ex) == -1)
                goto exception;
            
            if (token->token != ']')
                goto unexpected;
            
            if (camel_imap4_engine_next_token (engine, token, ex) == -1)
                goto exception;
            
            if (token->token != CAMEL_IMAP4_TOKEN_LITERAL)
                goto unexpected;
            
            fstream = (CamelStream *) camel_stream_filter_new_with_stream (stream);
            crlf = camel_mime_filter_crlf_new (CAMEL_MIME_FILTER_CRLF_DECODE, CAMEL_MIME_FILTER_CRLF_MODE_CRLF_ONLY);
            camel_stream_filter_add ((CamelStreamFilter *) fstream, crlf);
            camel_object_unref (crlf);
            
            camel_stream_write_to_stream ((CamelStream *) engine->istream, fstream);
            camel_stream_flush (fstream);
            camel_object_unref (fstream);
            
            left--;
        } else if (!strcmp (token->v.atom, "UID")) {
            if (camel_imap4_engine_next_token (engine, token, ex) == -1)
                goto exception;
            
            if (token->token != CAMEL_IMAP4_TOKEN_NUMBER || token->v.number == 0)
                goto unexpected;
            
            left--;
        } else {
            /* wtf? */
            fprintf (stderr, "huh? %s?...\n", token->v.atom);
        }
    } while (left);
    
    if (camel_imap4_engine_next_token (engine, token, ex) == -1)
        goto exception;
    
    if (token->token != ')') {
        fprintf (stderr, "expected ')' to close untagged FETCH response\n");
        goto unexpected;
    }
    
    return 0;
    
 unexpected:
    
    camel_imap4_utils_set_unexpected_token_error (ex, engine, token);
    
 exception:
    
    return -1;
}

static CamelMimeMessage *
imap4_get_message (CamelFolder *folder, const char *uid, CamelException *ex)
{
    CamelIMAP4Engine *engine = ((CamelIMAP4Store *) folder->parent_store)->engine;
    CamelMimeMessage *message = NULL;
    CamelIMAP4Command *ic;
    CamelStream *stream;
    int id;
    
    CAMEL_SERVICE_LOCK (folder->parent_store, connect_lock);
    
    ic = camel_imap4_engine_queue (engine, folder, "UID FETCH %s BODY.PEEK[]\r\n", uid);
    camel_imap4_command_register_untagged (ic, "FETCH", untagged_fetch);
    ic->user_data = stream = camel_stream_mem_new ();
    
    while ((id = camel_imap4_engine_iterate (engine)) < ic->id && id != -1)
        ;
    
    if (id == -1 || ic->status != CAMEL_IMAP4_COMMAND_COMPLETE) {
        camel_exception_xfer (ex, &ic->ex);
        camel_imap4_command_unref (ic);
        camel_object_unref (stream);
        goto done;
    }
    
    switch (ic->result) {
    case CAMEL_IMAP4_RESULT_OK:
        camel_stream_reset (stream);
        message = camel_mime_message_new ();
        camel_data_wrapper_construct_from_stream ((CamelDataWrapper *) message, stream);
        break;
    case CAMEL_IMAP4_RESULT_NO:
        /* FIXME: would be good to save the NO reason into the err message */
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Cannot get message %s from folder `%s': No such message"),
                      uid, folder->full_name);
        break;
    case CAMEL_IMAP4_RESULT_BAD:
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Cannot get message %s from folder `%s': Bad command"),
                      uid, folder->full_name);
        break;
    }
    
    camel_imap4_command_unref (ic);
    
    camel_object_unref (stream);
    
 done:
    
    CAMEL_SERVICE_UNLOCK (folder->parent_store, connect_lock);
    
    return message;
}

static char *tm_months[] = {
    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};

static void
imap4_append_message (CamelFolder *folder, CamelMimeMessage *message,
             const CamelMessageInfo *info, char **appended_uid, CamelException *ex)
{
    CamelIMAP4Engine *engine = ((CamelIMAP4Store *) folder->parent_store)->engine;
    CamelIMAP4Summary *summary = (CamelIMAP4Summary *) folder->summary;
    CamelIMAP4RespCode *resp;
    CamelIMAP4Command *ic;
    CamelFolderInfo *fi;
    CamelException lex;
    char flags[100], *p;
    char date[50];
    struct tm tm;
    int id, i;
    
    CAMEL_SERVICE_LOCK (folder->parent_store, connect_lock);
    
    /* construct the option flags list */
    if (info->flags & folder->permanent_flags) {
        p = g_stpcpy (flags, " (");
        
        for (i = 0; i < G_N_ELEMENTS (imap4_flags); i++) {
            if ((info->flags & imap4_flags[i].flag) & folder->permanent_flags) {
                p = g_stpcpy (p, imap4_flags[i].name);
                *p++ = ' ';
            }
        }
        
        p[-1] = ')';
        *p = '\0';
    } else {
        flags[0] = '\0';
    }
    
    /* construct the optional date_time string */
    if (info->date_received != (time_t) -1) {
        int tzone;
        
#ifdef HAVE_LOCALTIME_R
        localtime_r (&info->date_received, &tm);
#else
        memcpy (&tm, localtime (&info->date_received), sizeof (tm));
#endif
        
#if defined (HAVE_TM_GMTOFF)
        tzone = -tm.tm_gmtoff;
#elif defined (HAVE_TIMEZONE)
        if (tm.tm_isdst > 0) {
#if defined (HAVE_ALTZONE)
            tzone = altzone;
#else /* !defined (HAVE_ALTZONE) */
            tzone = (timezone - 3600);
#endif
        } else {
            tzone = timezone;
        }
#else
#error Neither HAVE_TIMEZONE nor HAVE_TM_GMTOFF defined. Rerun autoheader, autoconf, etc.
#endif
        
        sprintf (date, " \"%02d-%s-%04d %02d:%02d:%02d %+05d\"",
             tm.tm_mday, tm_months[tm.tm_mon], tm.tm_year + 1900,
             tm.tm_hour, tm.tm_min, tm.tm_sec, tzone);
    } else {
        date[0] = '\0';
    }
    
 retry:
    
    if (engine->capa & CAMEL_IMAP4_CAPABILITY_UIDPLUS)
        ic = camel_imap4_engine_queue (engine, NULL, "UID APPEND %F%s%s %L\r\n", flags, date, message);
    else
        ic = camel_imap4_engine_queue (engine, NULL, "APPEND %F%s%s %L\r\n", flags, date, message);
    
    while ((id = camel_imap4_engine_iterate (engine)) < ic->id && id != -1)
        ;
    
    if (id == -1 || ic->status != CAMEL_IMAP4_COMMAND_COMPLETE) {
        camel_exception_xfer (ex, &ic->ex);
        camel_imap4_command_unref (ic);
        CAMEL_SERVICE_UNLOCK (folder->parent_store, connect_lock);
        return;
    }
    
    switch (ic->result) {
    case CAMEL_IMAP4_RESULT_OK:
        if (!(engine->capa & CAMEL_IMAP4_CAPABILITY_UIDPLUS))
            break;
        
        if (!appended_uid)
            break;
        
        for (i = 0; i < ic->resp_codes->len; i++) {
            resp = ic->resp_codes->pdata[i];
            if (resp->code == CAMEL_IMAP4_RESP_CODE_APPENDUID) {
                if (resp->v.appenduid.uidvalidity == summary->uidvalidity)
                    *appended_uid = g_strdup_printf ("%u", resp->v.appenduid.uid);
                break;
            }
        }
        break;
    case CAMEL_IMAP4_RESULT_NO:
        /* FIXME: can we give the user any more information? */
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Cannot append message to folder `%s': Unknown error"),
                      folder->full_name);
        
        for (i = 0; i < ic->resp_codes->len; i++) {
            resp = ic->resp_codes->pdata[i];
            if (resp->code == CAMEL_IMAP4_RESP_CODE_TRYCREATE) {
                char *parent_name, *p;
                
                parent_name = g_alloca (strlen (folder->full_name) + 1);
                if (!(p = strrchr (parent_name, '/')))
                    *parent_name = '\0';
                else
                    *p = '\0';
                
                if (!(fi = camel_store_create_folder (folder->parent_store, parent_name, folder->name, &lex))) {
                    camel_exception_clear (&lex);
                    break;
                }
                
                camel_store_free_folder_info (folder->parent_store, fi);
                camel_imap4_command_unref (ic);
                camel_exception_clear (ex);
                goto retry;
            }
        }
        
        break;
    case CAMEL_IMAP4_RESULT_BAD:
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Cannot append message to folder `%s': Bad command"),
                      folder->full_name);
        
        break;
    default:
        g_assert_not_reached ();
    }
    
    camel_imap4_command_unref (ic);
    
    CAMEL_SERVICE_UNLOCK (folder->parent_store, connect_lock);
}


static int
info_uid_sort (const CamelMessageInfo **info0, const CamelMessageInfo **info1)
{
    guint32 uid0, uid1;
    
    uid0 = strtoul (camel_message_info_uid (*info0), NULL, 10);
    uid1 = strtoul (camel_message_info_uid (*info1), NULL, 10);
    
    if (uid0 == uid1)
        return 0;
    
    return uid0 < uid1 ? -1 : 1;
}

static void
imap4_transfer_messages_to (CamelFolder *src, GPtrArray *uids, CamelFolder *dest,
               GPtrArray **transferred_uids, gboolean delete_originals, CamelException *ex)
{
    CamelIMAP4Engine *engine = ((CamelIMAP4Store *) src->parent_store)->engine;
    int i, j, n, id, dest_namelen;
    CamelMessageInfo *info;
    CamelIMAP4Command *ic;
    GPtrArray *infos;
    char *set;
    
    infos = g_ptr_array_new ();
    for (i = 0; i < uids->len; i++) {
        if (!(info = camel_folder_summary_uid (src->summary, uids->pdata[i])))
            continue;
        
        g_ptr_array_add (infos, info);
    }
    
    if (infos->len == 0) {
        g_ptr_array_free (infos, TRUE);
        return;
    }
    
    g_ptr_array_sort (infos, (GCompareFunc) info_uid_sort);
    
    CAMEL_SERVICE_LOCK (src->parent_store, connect_lock);
    
    dest_namelen = strlen (camel_imap4_folder_utf7_name ((CamelIMAP4Folder *) dest));
    
    for (i = 0; i < infos->len; i += n) {
        n = imap4_get_uid_set (engine, src->summary, infos, i, 10 + dest_namelen, &set);
        
        ic = camel_imap4_engine_queue (engine, src, "UID COPY %s %F\r\n", set, dest);
        while ((id = camel_imap4_engine_iterate (engine)) < ic->id && id != -1)
            ;
        
        g_free (set);
        
        if (id == -1 || ic->status != CAMEL_IMAP4_COMMAND_COMPLETE) {
            camel_exception_xfer (ex, &ic->ex);
            camel_imap4_command_unref (ic);
            g_free (set);
            goto done;
        }
        
        switch (ic->result) {
        case CAMEL_IMAP4_RESULT_NO:
            /* FIXME: would be good to save the NO reason into the err message */
            if (delete_originals) {
                camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                              _("Cannot move messages from folder `%s' to folder `%s': Unknown"),
                              src->full_name, dest->full_name);
            } else {
                camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                              _("Cannot copy messages from folder `%s' to folder `%s': Unknown"),
                              src->full_name, dest->full_name);
            }
            
            goto done;
        case CAMEL_IMAP4_RESULT_BAD:
            if (delete_originals) {
                camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                              _("Cannot move messages from folder `%s' to folder `%s': Bad command"),
                              src->full_name, dest->full_name);
            } else {
                camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                              _("Cannot copy messages from folder `%s' to folder `%s': Bad command"),
                              src->full_name, dest->full_name);
            }
            
            goto done;
        }
        
        camel_imap4_command_unref (ic);
        
        if (delete_originals) {
            for (j = i; j < n; j++) {
                info = infos->pdata[j];
                camel_folder_set_message_flags (src, camel_message_info_uid (info),
                                CAMEL_MESSAGE_DELETED, CAMEL_MESSAGE_DELETED);
            }
            
            camel_folder_summary_touch (src->summary);
        }
    }
    
 done:
    
    for (i = 0; i < infos->len; i++)
        camel_folder_summary_info_free (src->summary, infos->pdata[i]);
    g_ptr_array_free (infos, TRUE);
    
    CAMEL_SERVICE_LOCK (src->parent_store, connect_lock);
}