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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; fill-column: 160 -*- */
/* camel-imap-folder.c: Abstract class for an imap folder */

/* 
 * Authors: Jeffrey Stedfast <fejj@helixcode.com> 
 *
 * 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
 */


#include <config.h> 

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

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

#include "camel-imap-folder.h"
#include "camel-imap-command.h"
#include "camel-imap-store.h"
#include "camel-imap-stream.h"
#include "camel-imap-utils.h"
#include "string-utils.h"
#include "camel-stream.h"
#include "camel-stream-fs.h"
#include "camel-stream-mem.h"
#include "camel-stream-buffer.h"
#include "camel-data-wrapper.h"
#include "camel-mime-message.h"
#include "camel-stream-filter.h"
#include "camel-mime-filter-from.h"
#include "camel-mime-filter-crlf.h"
#include "camel-exception.h"
#include "camel-mime-utils.h"

#define d(x) x

#define CF_CLASS(o) (CAMEL_FOLDER_CLASS (CAMEL_OBJECT_GET_CLASS(o)))

static CamelFolderClass *parent_class = NULL;

static void imap_finalize (CamelObject *object);
static void imap_refresh_info (CamelFolder *folder, CamelException *ex);
static void imap_sync (CamelFolder *folder, gboolean expunge, CamelException *ex);
static void imap_expunge (CamelFolder *folder, CamelException *ex);

/* message counts */
static gint imap_get_message_count_internal (CamelFolder *folder, CamelException *ex);
static gint imap_get_message_count (CamelFolder *folder);
static gint imap_get_unread_message_count (CamelFolder *folder);

/* message manipulation */
static CamelMimeMessage *imap_get_message (CamelFolder *folder, const gchar *uid,
                       CamelException *ex);
static void imap_append_message (CamelFolder *folder, CamelMimeMessage *message,
                 const CamelMessageInfo *info, CamelException *ex);
static void imap_copy_message_to (CamelFolder *source, const char *uid,
                  CamelFolder *destination, CamelException *ex);
static void imap_move_message_to (CamelFolder *source, const char *uid,
                  CamelFolder *destination, CamelException *ex);

/* summary info */
static GPtrArray *imap_get_uids (CamelFolder *folder);
static GPtrArray *imap_get_summary_internal (CamelFolder *folder, CamelException *ex);
static GPtrArray *imap_get_summary (CamelFolder *folder);
static const CamelMessageInfo *imap_get_message_info (CamelFolder *folder, const char *uid);

/* searching */
static GPtrArray *imap_search_by_expression (CamelFolder *folder, const char *expression, CamelException *ex);

/* flag methods */
static guint32  imap_get_message_flags     (CamelFolder *folder, const char *uid);
static void     imap_set_message_flags     (CamelFolder *folder, const char *uid, guint32 flags, guint32 set);
static gboolean imap_get_message_user_flag (CamelFolder *folder, const char *uid, const char *name);
static void     imap_set_message_user_flag (CamelFolder *folder, const char *uid, const char *name,
                        gboolean value);


static void
camel_imap_folder_class_init (CamelImapFolderClass *camel_imap_folder_class)
{
    CamelFolderClass *camel_folder_class = CAMEL_FOLDER_CLASS (camel_imap_folder_class);

    parent_class = CAMEL_FOLDER_CLASS(camel_type_get_global_classfuncs (camel_folder_get_type ()));
    
    /* virtual method definition */
    
    /* virtual method overload */
    camel_folder_class->refresh_info = imap_refresh_info;
    camel_folder_class->sync = imap_sync;
    camel_folder_class->expunge = imap_expunge;
    
    camel_folder_class->get_uids = imap_get_uids;
    camel_folder_class->free_uids = camel_folder_free_nop;
    
    camel_folder_class->get_message_count = imap_get_message_count;
    camel_folder_class->get_unread_message_count = imap_get_unread_message_count;
    camel_folder_class->get_message = imap_get_message;
    camel_folder_class->append_message = imap_append_message;
    camel_folder_class->copy_message_to = imap_copy_message_to;
    camel_folder_class->move_message_to = imap_move_message_to;
    
    camel_folder_class->get_summary = imap_get_summary;
    camel_folder_class->get_message_info = imap_get_message_info;
    camel_folder_class->free_summary = camel_folder_free_nop;
    
    camel_folder_class->search_by_expression = imap_search_by_expression;
    
    camel_folder_class->get_message_flags = imap_get_message_flags;
    camel_folder_class->set_message_flags = imap_set_message_flags;
    camel_folder_class->get_message_user_flag = imap_get_message_user_flag;
    camel_folder_class->set_message_user_flag = imap_set_message_user_flag;
}

static void
camel_imap_folder_init (gpointer object, gpointer klass)
{
    CamelImapFolder *imap_folder = CAMEL_IMAP_FOLDER (object);
    CamelFolder *folder = CAMEL_FOLDER (object);
    
    folder->has_summary_capability = TRUE;
    folder->has_search_capability = TRUE;
    
    imap_folder->summary = NULL;
    imap_folder->summary_hash = NULL;

        /* some IMAP daemons support user-flags              *
     * I would not, however, rely on this feature as     *
     * most IMAP daemons do not support all the features */
    folder->permanent_flags = CAMEL_MESSAGE_SEEN |
        CAMEL_MESSAGE_ANSWERED |
        CAMEL_MESSAGE_FLAGGED |
        CAMEL_MESSAGE_DELETED |
        CAMEL_MESSAGE_DRAFT |
        CAMEL_MESSAGE_USER;
}

CamelType
camel_imap_folder_get_type (void)
{
    static CamelType camel_imap_folder_type = CAMEL_INVALID_TYPE;
    
    if (camel_imap_folder_type == CAMEL_INVALID_TYPE) {
        camel_imap_folder_type =
            camel_type_register (CAMEL_FOLDER_TYPE, "CamelImapFolder",
                         sizeof (CamelImapFolder),
                         sizeof (CamelImapFolderClass),
                         (CamelObjectClassInitFunc) camel_imap_folder_class_init,
                         NULL,
                         (CamelObjectInitFunc) camel_imap_folder_init,
                         (CamelObjectFinalizeFunc) imap_finalize);
    }
    
    return camel_imap_folder_type;
}

CamelFolder *
camel_imap_folder_new (CamelStore *parent, const char *folder_name)
{
    CamelFolder *folder = CAMEL_FOLDER (camel_object_new (camel_imap_folder_get_type ()));
    const char *dir_sep, *short_name;
    
    dir_sep = CAMEL_IMAP_STORE (parent)->dir_sep;
    short_name = strrchr (folder_name, *dir_sep);
    if (short_name)
        short_name++;
    else
        short_name = folder_name;
    camel_folder_construct (folder, parent, folder_name, short_name);
    
    return folder;
}

static void
imap_summary_free (GPtrArray **summary)
{
    GPtrArray *array = *summary;
    gint i;
    
    if (array) {
        for (i = 0; i < array->len; i++)
            camel_message_info_free (array->pdata[i]);
        
        g_ptr_array_free (array, TRUE);
        *summary = NULL;
    }
}

static void
imap_folder_summary_free (CamelImapFolder *imap_folder)
{
    if (imap_folder->summary_hash) {
        g_hash_table_destroy (imap_folder->summary_hash);
        imap_folder->summary_hash = NULL;
    }
    
    imap_summary_free (&imap_folder->summary);
}

static void           
imap_finalize (CamelObject *object)
{
    CamelImapFolder *imap_folder = CAMEL_IMAP_FOLDER (object);

    imap_folder_summary_free (imap_folder);
}

static void
imap_refresh_info (CamelFolder *folder, CamelException *ex)
{
    imap_get_summary_internal (folder, ex);
}

static void
imap_sync (CamelFolder *folder, gboolean expunge, CamelException *ex)
{
    CamelImapStore *store = CAMEL_IMAP_STORE (folder->parent_store);
    CamelImapFolder *imap_folder = CAMEL_IMAP_FOLDER (folder);
    CamelImapResponse *response;
    gint i, max;
    
    if (expunge) {
        imap_expunge (folder, ex);
        return;
    }
    
    /* Set the flags on any messages that have changed this session */
    if (imap_folder->summary) {
        max = imap_folder->summary->len;
        for (i = 0; i < max; i++) {
            CamelMessageInfo *info;
            
            info = g_ptr_array_index (imap_folder->summary, i);
            if (info->flags & CAMEL_MESSAGE_FOLDER_FLAGGED) {
                char *flags;
                
                flags = imap_create_flag_list (info->flags);
                if (flags) {
                    response = camel_imap_command (
                        store, folder, ex,
                        "UID STORE %s FLAGS.SILENT %s",
                        info->uid, flags);
                    g_free (flags);
                    if (!response)
                        return;
                    camel_imap_response_free (response);
                }
                info->flags &= ~CAMEL_MESSAGE_FOLDER_FLAGGED;
            }
        }
    }
}

static void
imap_expunge (CamelFolder *folder, CamelException *ex)
{
    CamelImapStore *store = CAMEL_IMAP_STORE (folder->parent_store);
    CamelImapResponse *response;

    imap_sync (folder, FALSE, ex);
    response = camel_imap_command (store, folder, ex, "EXPUNGE");
    camel_imap_response_free (response);
}

static gint
imap_get_message_count_internal (CamelFolder *folder, CamelException *ex)
{
    CamelImapStore *store = CAMEL_IMAP_STORE (folder->parent_store);
    char *result, *msg_count, *folder_path;
    CamelImapResponse *response;
    int count = 0;
    
    folder_path = camel_imap_store_folder_path (store, folder->full_name);
    if (store->has_status_capability)
        response = camel_imap_command (store, folder, ex,
                           "STATUS \"%s\" (MESSAGES)",
                           folder_path);
    else
        response = camel_imap_command (store, folder, ex,
                           "EXAMINE \"%s\"", folder_path);
    g_free (folder_path);
    if (!response)
        return 0;
    
    /* parse out the message count */
    if (store->has_status_capability) {
        /* should come in the form: "* STATUS <folder> (MESSAGES <count>)" */
        result = camel_imap_response_extract (response, "STATUS", NULL);
        if (result) {
            if ((msg_count = strstr (result, "MESSAGES")) != NULL) {
                msg_count = imap_next_word (msg_count);
            
                /* we should now be pointing to the message count */
                count = atoi (msg_count);
            }
            g_free (result);
        }
    } else {
        /* should come in the form: "* <count> EXISTS" */
        result = camel_imap_response_extract (response, "EXISTS", NULL);
        if (result) {
            if ((msg_count = strstr (result, "EXISTS")) != NULL) {
                for ( ; msg_count > result && *msg_count != '*'; msg_count--);
                
                msg_count = imap_next_word (msg_count);
                
                /* we should now be pointing to the message count */
                count = atoi (msg_count);
            }
            g_free (result);
        }
    }
    
    return count;
}

static gint
imap_get_message_count (CamelFolder *folder)
{
    CamelImapFolder *imap_folder = CAMEL_IMAP_FOLDER (folder);
    
    if (imap_folder->summary)
        return imap_folder->summary->len;
    else
        return 0;
}

static gint
imap_get_unread_message_count (CamelFolder *folder)
{
    CamelImapFolder *imap_folder = CAMEL_IMAP_FOLDER (folder);
    CamelMessageInfo *info;
    GPtrArray *infolist;
    gint i, count = 0;
    
    g_return_val_if_fail (folder != NULL, 0);
    
    /* If we don't have a message count, return 0 */
    if (!imap_folder->summary)
        return 0;
    
    infolist = imap_folder->summary;
    
    for (i = 0; i < infolist->len; i++) {
        info = (CamelMessageInfo *) g_ptr_array_index (infolist, i);
        if (!(info->flags & CAMEL_MESSAGE_SEEN))
            count++;
    }
    
    return count;
}

static void
imap_append_message (CamelFolder *folder, CamelMimeMessage *message,
             const CamelMessageInfo *info, CamelException *ex)
{
    CamelImapStore *store = CAMEL_IMAP_STORE (folder->parent_store);
    CamelImapResponse *response;
    CamelStream *memstream;
    CamelMimeFilter *crlf_filter;
    CamelStreamFilter *streamfilter;
    GByteArray *ba;
    char *folder_path, *flagstr, *result;
    
    folder_path = camel_imap_store_folder_path (store, folder->full_name);
    
    /* create flag string param */
    if (info && info->flags)
        flagstr = imap_create_flag_list (info->flags);
    else
        flagstr = NULL;

    /* FIXME: We could avoid this if we knew how big the message was. */
    memstream = camel_stream_mem_new ();
    ba = g_byte_array_new ();
    camel_stream_mem_set_byte_array (CAMEL_STREAM_MEM (memstream), ba);

    streamfilter = camel_stream_filter_new_with_stream (memstream);
    crlf_filter = camel_mime_filter_crlf_new (
        CAMEL_MIME_FILTER_CRLF_ENCODE,
        CAMEL_MIME_FILTER_CRLF_MODE_CRLF_ONLY);
    camel_stream_filter_add (streamfilter, crlf_filter);
    camel_data_wrapper_write_to_stream (CAMEL_DATA_WRAPPER (message),
                        CAMEL_STREAM (streamfilter));
    camel_object_unref (CAMEL_OBJECT (streamfilter));
    camel_object_unref (CAMEL_OBJECT (crlf_filter));
    camel_object_unref (CAMEL_OBJECT (memstream));

    response = camel_imap_command (store, NULL, ex, "APPEND %s%s%s {%d}",
                       folder_path, flagstr ? " " : "",
                       flagstr ? flagstr : "", ba->len);
    g_free (folder_path);
    g_free (flagstr);
    
    if (!response) {
        g_byte_array_free (ba, TRUE);
        return;
    }
    result = camel_imap_response_extract_continuation (response, ex);
    if (!result) {
        g_byte_array_free (ba, TRUE);
        return;
    }
    g_free (result);

    /* send the rest of our data - the mime message */
    g_byte_array_append (ba, "\0", 3);
    response = camel_imap_command_continuation (store, ex, ba->data);
    g_byte_array_free (ba, TRUE);
    if (!response)
        return;
    camel_imap_response_free (response);
}

static void
imap_copy_message_to (CamelFolder *source, const char *uid,
              CamelFolder *destination, CamelException *ex)
{
    CamelImapStore *store = CAMEL_IMAP_STORE (source->parent_store);
    CamelImapResponse *response;
    char *folder_path;
    
    folder_path = camel_imap_store_folder_path (store, destination->full_name);
    response = camel_imap_command (store, source, ex, "UID COPY %s \"%s\"",
                       uid, folder_path);
    camel_imap_response_free (response);
    g_free (folder_path);
}

/* FIXME: Duplication of code! */
static void
imap_move_message_to (CamelFolder *source, const char *uid,
              CamelFolder *destination, CamelException *ex)
{
    CamelImapStore *store = CAMEL_IMAP_STORE (source->parent_store);
    CamelImapResponse *response;
    char *folder_path;

    folder_path = camel_imap_store_folder_path (store, destination->full_name); 
    response = camel_imap_command (store, source, ex, "UID COPY %s \"%s\"",
                       uid, folder_path);
    camel_imap_response_free (response);
    g_free (folder_path);

    if (camel_exception_is_set (ex))
        return;

    camel_folder_delete_message (source, uid);
}

static GPtrArray *
imap_get_uids (CamelFolder *folder) 
{
    const CamelMessageInfo *info;
    GPtrArray *array, *infolist;
    gint i, count;
    
    infolist = imap_get_summary (folder);
    
    count = infolist ? infolist->len : 0;
    
    array = g_ptr_array_new ();
    g_ptr_array_set_size (array, count);
    
    for (i = 0; i < count; i++) {
        info = g_ptr_array_index (infolist, i);
        array->pdata[i] = g_strdup (info->uid);
    }
    
    return array;
}

static CamelMimeMessage *
imap_get_message (CamelFolder *folder, const gchar *uid, CamelException *ex)
{
    CamelImapStore *store = CAMEL_IMAP_STORE (folder->parent_store);
    CamelImapResponse *response;
    CamelStream *msgstream;
    CamelMimeMessage *msg;
    char *result, *mesg, *p;
    int len;

    response = camel_imap_command (store, folder, ex,
                       "UID FETCH %s RFC822", uid);
    if (!response)
        return NULL;
    result = camel_imap_response_extract (response, "FETCH", ex);
    if (!result)
        return NULL;

    p = strstr (result, "RFC822");
    if (p) {
        p += 7;
        mesg = imap_parse_nstring (&p, &len);
    }
    if (!p) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE,
                      "Could not find message body in FETCH "
                      "response.");
        g_free (result);
        return NULL;
    }
    g_free (result);

    msgstream = camel_stream_mem_new_with_buffer (mesg, len);
    msg = camel_mime_message_new ();
    camel_data_wrapper_construct_from_stream (CAMEL_DATA_WRAPPER (msg),
                          msgstream);
    camel_object_unref (CAMEL_OBJECT (msgstream));
    g_free (mesg);

    return msg;
}

/* This probably shouldn't go here...but it will for now */
static gchar *
get_header_field (gchar *header, gchar *field)
{
    gchar *part, *index, *p, *q;
    
    index = (char *) e_strstrcase (header, field);
    if (index == NULL)
        return NULL;
    
    p = index + strlen (field) + 1;
    for (q = p; *q; q++)
        if (*q == '\n' && (*(q + 1) != ' ' && *(q + 1) != '\t'))
            break;
    
    part = g_strndup (p, (gint)(q - p));
    
    /* it may be wrapped on multiple lines, so lets strip out \n's */
    for (p = part; *p; ) {
        if (*p == '\n')
            memmove (p, p + 1, strlen (p));
        else
            p++;
    }
    
    return part;
}

static char *header_fields[] = { "subject", "from", "to", "cc", "date",
                 "received", "message-id", "references",
                 "in-reply-to", "" };
/**
 * imap_protocol_get_summary_specifier
 *
 * Make a data item specifier for the header lines we need,
 * appropriate to the server level.
 *
 * IMAP4rev1:  UID FLAGS BODY.PEEK[HEADER.FIELDS (SUBJECT FROM .. IN-REPLY-TO)]
 * IMAP4:      UID FLAGS RFC822.HEADER.LINES (SUBJECT FROM .. IN-REPLY-TO)
 **/
static char *
imap_protocol_get_summary_specifier (CamelImapStore *store)
{
    char *sect_begin, *sect_end;
    char *headers_wanted = "SUBJECT FROM TO CC DATE MESSAGE-ID REFERENCES IN-REPLY-TO";
    
    if (store->server_level >= IMAP_LEVEL_IMAP4REV1) {
        sect_begin = "BODY.PEEK[HEADER.FIELDS";
        sect_end = "]";
    } else {
        sect_begin = "RFC822.HEADER.LINES";
        sect_end   = "";
    }
    
    return g_strdup_printf ("UID FLAGS %s (%s)%s", sect_begin,
                headers_wanted, sect_end);
}

static GPtrArray *
imap_get_summary_internal (CamelFolder *folder, CamelException *ex)
{
    /* This ALWAYS updates the summary except on fail */
    CamelImapStore *store = CAMEL_IMAP_STORE (folder->parent_store);
    CamelImapFolder *imap_folder = CAMEL_IMAP_FOLDER (folder);
    CamelImapResponse *response;
    GPtrArray *summary = NULL, *headers = NULL;
    GHashTable *hash = NULL;
    int num, i, j;
    char *q;
    const char *received;
    char *summary_specifier;
    struct _header_raw *h = NULL, *tail = NULL;
    
    num = imap_get_message_count_internal (folder, ex);
    
    /* sync any previously set/changed message flags */
    imap_sync (folder, FALSE, ex);
    
    if (num == 0) {
        /* clean up any previous summary data */
        imap_folder_summary_free (imap_folder);
        
        imap_folder->summary = g_ptr_array_new ();
        imap_folder->summary_hash = g_hash_table_new (g_str_hash, g_str_equal);
        
        return imap_folder->summary;
    }
    
    summary_specifier = imap_protocol_get_summary_specifier (store);
    if (num == 1) {
        response = camel_imap_command (store, folder, ex,
                           "FETCH 1 (%s)",
                           summary_specifier);
    } else {
        response = camel_imap_command (store, folder, ex,
                           "FETCH 1:%d (%s)", num,
                           summary_specifier);
    }
    g_free (summary_specifier);
    
    if (!response) {
        if (!imap_folder->summary) {
            imap_folder->summary = g_ptr_array_new ();
            imap_folder->summary_hash = g_hash_table_new (g_str_hash, g_str_equal);
        }
        
        return imap_folder->summary;
    }
    headers = response->untagged;

    /* initialize our new summary-to-be */
    summary = g_ptr_array_new ();
    hash = g_hash_table_new (g_str_hash, g_str_equal);
    
    for (i = 0; i < headers->len; i++) {
        CamelMessageInfo *info;
        char *uid, *flags, *header;
        
        info = g_malloc0 (sizeof (CamelMessageInfo));
        
        /* lets grab the UID... */
        if (!(uid = strstr (headers->pdata[i], "UID "))) {
            d(fprintf (stderr, "Cannot get a uid for %d\n\n%s\n\n", i+1, (char *) headers->pdata[i]));
            g_free (info);
            break;
        }
        
        for (uid += 4; *uid && (*uid < '0' || *uid > '9'); uid++); /* advance to <uid> */
        for (q = uid; *q && *q >= '0' && *q <= '9'; q++); /* find the end of the <uid> */
        info->uid = g_strndup (uid, (gint)(q - uid));
        /*d(fprintf (stderr, "*** info->uid = %s\n", info->uid));*/
        
        /* now lets grab the FLAGS */
        if (!(flags = strstr (headers->pdata[i], "FLAGS "))) {
            d(fprintf (stderr, "We didn't seem to get any flags for %d...\n", i));
            g_free (info->uid);
            g_free (info);
            break;
        }
        
        for (flags += 6; *flags && *flags != '('; flags++); /* advance to <flags> */
        info->flags = imap_parse_flag_list (flags);
        
        /* construct the header list */
        /* fast-forward to beginning of header info... */
        for (header = headers->pdata[i]; *header && *header != '\n'; header++);
        h = NULL;
        for (j = 0; *header_fields[j]; j++) {
            struct _header_raw *raw;
            char *field, *value;
            
            field = g_strdup_printf ("\n%s:", header_fields[j]);
            value = get_header_field (header, field);
            g_free (field);
            if (!value)
                continue;
            
            raw = g_malloc0 (sizeof (struct _header_raw));
            raw->next = NULL;
            raw->name = g_strdup (header_fields[j]);
            raw->value = value;
            raw->offset = -1;
            
            if (!h) {
                h = raw;
                tail = h;
            } else {
                tail->next = raw;
                tail = raw;
            }
        }
        
        /* construct the CamelMessageInfo */
        info->subject = camel_summary_format_string (h, "subject");
        info->from = camel_summary_format_address (h, "from");
        info->to = camel_summary_format_address (h, "to");
        info->cc = camel_summary_format_address (h, "cc");
        info->user_flags = NULL;
        info->date_sent = header_decode_date (header_raw_find (&h, "date", NULL), NULL);
        received = header_raw_find (&h, "received", NULL);
        if (received)
            received = strrchr (received, ';');
        if (received)
            info->date_received = header_decode_date (received + 1, NULL);
        else
            info->date_received = 0;
        info->message_id = header_msgid_decode (header_raw_find (&h, "message-id", NULL));
        /* if we have a references, use that, otherwise, see if we have an in-reply-to
           header, with parsable content, otherwise *shrug* */
        info->references = header_references_decode (header_raw_find (&h, "references", NULL));
        if (info->references == NULL)
            info->references = header_references_decode (header_raw_find (&h, "in-reply-to", NULL));
        
        header_raw_clear (&h);
        
        g_ptr_array_add (summary, info);
        g_hash_table_insert (hash, info->uid, info);
    }
    camel_imap_response_free (response);
    
    /* clean up any previous summary data */
    imap_folder_summary_free (imap_folder);
    
    imap_folder->summary = summary;
    imap_folder->summary_hash = hash;
    
    return imap_folder->summary;
}

static GPtrArray *
imap_get_summary (CamelFolder *folder)
{
    CamelImapFolder *imap_folder = CAMEL_IMAP_FOLDER (folder);
    
    return imap_folder->summary;
}

/* get a single message info from the server */
static CamelMessageInfo *
imap_get_message_info_internal (CamelFolder *folder, guint id, CamelException *ex)
{
    CamelImapStore *store = CAMEL_IMAP_STORE (folder->parent_store);
    CamelImapResponse *response;
    CamelMessageInfo *info = NULL;
    struct _header_raw *h, *tail = NULL;
    const char *received;
    char *result, *uid, *flags, *header, *q;
    char *summary_specifier;
    int j;
    
    /* we don't have a cached copy, so fetch it */
    summary_specifier = imap_protocol_get_summary_specifier (store);
    response = camel_imap_command (store, folder, ex,
                     "FETCH %d (%s)", id, summary_specifier);
    g_free (summary_specifier);

    if (!response)
        return NULL;
    result = camel_imap_response_extract (response, "FETCH", ex);
    if (!result)
        return NULL;
    
    /* lets grab the UID... */
    if (!(uid = (char *) e_strstrcase (result, "UID "))) {
        d(fprintf (stderr, "Cannot get a uid for %d\n\n%s\n\n", id, result));
        g_free (result);
        return NULL;
    }
        
    for (uid += 4; *uid && (*uid < '0' || *uid > '9'); uid++); /* advance to <uid> */
    for (q = uid; *q && *q >= '0' && *q <= '9'; q++); /* find the end of the <uid> */
    uid = g_strndup (uid, (gint)(q - uid));
    
    info = g_malloc0 (sizeof (CamelMessageInfo));
    info->uid = uid;
    d(fprintf (stderr, "*** info->uid = %s\n", info->uid));
    
    /* now lets grab the FLAGS */
    if (!(flags = strstr (q, "FLAGS "))) {
        d(fprintf (stderr, "We didn't seem to get any flags for %s...\n", uid));
        g_free (info->uid);
        g_free (info);
        g_free (result);
        return NULL;
    }
    
    for (flags += 6; *flags && *flags != '('; flags++); /* advance to <flags> */
    info->flags = imap_parse_flag_list (flags);
    
    /* construct the header list */
    /* fast-forward to beginning of header info... */
    for (header = q; *header && *header != '\n'; header++);
    h = NULL;
    for (j = 0; *header_fields[j]; j++) {
        struct _header_raw *raw;
        char *field, *value;
        
        field = g_strdup_printf ("\n%s:", header_fields[j]);
        value = get_header_field (header, field);
        g_free (field);
        if (!value)
            continue;
        
        raw = g_malloc0 (sizeof (struct _header_raw));
        raw->next = NULL;
        raw->name = g_strdup (header_fields[j]);
        raw->value = value;
        raw->offset = -1;
        
        if (!h) {
            h = raw;
            tail = h;
        } else {
            tail->next = raw;
            tail = raw;
        }
    }
    
    /* construct the CamelMessageInfo */
    info->subject = camel_summary_format_string (h, "subject");
    info->from = camel_summary_format_address (h, "from");
    info->to = camel_summary_format_address (h, "to");
    info->cc = camel_summary_format_address (h, "cc");
    info->user_flags = NULL;
    info->date_sent = header_decode_date (header_raw_find (&h, "date", NULL), NULL);
    received = header_raw_find (&h, "received", NULL);
    if (received)
        received = strrchr (received, ';');
    if (received)
        info->date_received = header_decode_date (received + 1, NULL);
    else
        info->date_received = 0;
    info->message_id = header_msgid_decode (header_raw_find (&h, "message-id", NULL));
    /* if we have a references, use that, otherwise, see if we have an in-reply-to
       header, with parsable content, otherwise *shrug* */
    info->references = header_references_decode (header_raw_find (&h, "references", NULL));
    if (info->references == NULL)
        info->references = header_references_decode (header_raw_find (&h, "in-reply-to", NULL));
    
    header_raw_clear (&h);
    g_free (result);
    
    return info;
}

/* get a single message info, by uid */
static const CamelMessageInfo *
imap_get_message_info (CamelFolder *folder, const char *uid)
{
    CamelImapFolder *imap_folder = CAMEL_IMAP_FOLDER (folder);
    
    if (imap_folder->summary)
        return g_hash_table_lookup (imap_folder->summary_hash, uid);
    
    return NULL;
}

static GPtrArray *
imap_search_by_expression (CamelFolder *folder, const char *expression, CamelException *ex)
{
    CamelImapResponse *response;
    GPtrArray *uids = NULL;
    char *result, *sexp, *p;
    
    d(fprintf (stderr, "camel sexp: '%s'\n", expression));
    sexp = imap_translate_sexp (expression);
    d(fprintf (stderr, "imap sexp: '%s'\n", sexp));
    
    uids = g_ptr_array_new ();
    
    if (!folder->has_search_capability) {
        g_free (sexp);
        return uids;
    }
    
    response = camel_imap_command (CAMEL_IMAP_STORE (folder->parent_store),
                       folder, NULL, "UID SEARCH %s", sexp);
    g_free (sexp);
    if (!response)
        return uids;

    result = camel_imap_response_extract (response, "SEARCH", NULL);
    if (!result)
        return uids;
    
    if ((p = strstr (result, "* SEARCH"))) {
        char *word;
        
        word = imap_next_word (p); /* word now points to SEARCH */
        
        for (word = imap_next_word (word); *word && *word != '*'; word = imap_next_word (word)) {
            gboolean word_is_numeric = TRUE;
            char *ep;
            
            /* find the end of this word and make sure it's a numeric uid */
            for (ep = word; *ep && *ep != ' ' && *ep != '\n'; ep++)
                if (*ep < '0' || *ep > '9')
                    word_is_numeric = FALSE;
            
            if (word_is_numeric)
                g_ptr_array_add (uids, g_strndup (word, (gint)(ep - word)));
        }
    }
    
    g_free (result);
    
    return uids;
}

static guint32
imap_get_message_flags (CamelFolder *folder, const char *uid)
{
    const CamelMessageInfo *info;
    
    info = imap_get_message_info (folder, uid);
    g_return_val_if_fail (info != NULL, 0);
    
    return info->flags;
}

static void
imap_set_message_flags (CamelFolder *folder, const char *uid, guint32 flags, guint32 set)
{
    CamelMessageInfo *info;
    
    info = (CamelMessageInfo*)imap_get_message_info (folder, uid);
    g_return_if_fail (info != NULL);
    
    info->flags = (info->flags & ~flags) | (set & flags) | CAMEL_MESSAGE_FOLDER_FLAGGED;
    
    camel_object_trigger_event (CAMEL_OBJECT (folder), "message_changed", (gpointer *) uid);
}

static gboolean
imap_get_message_user_flag (CamelFolder *folder, const char *uid, const char *name)
{
    return FALSE;
}

static void
imap_set_message_user_flag (CamelFolder *folder, const char *uid, const char *name, gboolean value)
{
    camel_object_trigger_event (CAMEL_OBJECT (folder), "message_changed", (gpointer *) uid);
}

void
camel_imap_folder_changed (CamelFolder *folder, gint recent, GArray *expunged, CamelException *ex)
{
    CamelImapFolder *imap_folder = CAMEL_IMAP_FOLDER (folder);
    
    if (expunged) {
        gint i, id;
        
        for (i = 0; i < expunged->len; i++) {
            id = g_array_index (expunged, int, i);
            d(fprintf (stderr, "Expunging message %d from the summary (i = %d)\n", id + i, i));
            
            if (id <= imap_folder->summary->len) {
                CamelMessageInfo *info;
                
                info = (CamelMessageInfo *) imap_folder->summary->pdata[id - 1];
                
                /* remove from the lookup table and summary */
                g_hash_table_remove (imap_folder->summary_hash, info->uid);
                g_ptr_array_remove_index (imap_folder->summary, id - 1);
                
                camel_message_info_free (info);
            } else {
                /* Hopefully this should never happen */
                d(fprintf (stderr, "imap expunge-error: message %d is out of range\n", id));
            }
        }
    }
    
    if (recent > 0) {
        CamelImapFolder *imap_folder = CAMEL_IMAP_FOLDER (folder);
        CamelMessageInfo *info;
        gint i, j, last, slast;
        
        if (!imap_folder->summary) {
            imap_folder->summary = g_ptr_array_new ();
            imap_folder->summary_hash = g_hash_table_new (g_str_hash, g_str_equal);
        }
        
        last = imap_folder->summary->len + 1;
        slast = imap_get_message_count_internal (folder, ex);
        fprintf (stderr, "calculated next message is: %d\n", last);
        fprintf (stderr, "server says %d mesgs total\n", slast);
        slast -= (recent - 1);
        fprintf (stderr, "based on total, new guess is: %d\n", slast);
        
        for (i = slast, j = 0; j < recent; i++, j++) {
            info = imap_get_message_info_internal (folder, i, ex);
            if (info) {
                if (!imap_get_message_info (folder, info->uid)) {
                    /* add to our summary */
                    g_ptr_array_add (imap_folder->summary, info);
                    g_hash_table_insert (imap_folder->summary_hash, info->uid, info);
                } else {
                    /* we already have a record of it */
                    camel_message_info_free (info);
                    d(fprintf (stderr, "we already had message %d!!\n", i));
                }
            } else {
                /* our hack failed so now we need to do it the old fashioned way */
                /*imap_get_summary_internal (folder, ex);*/
                d(fprintf (stderr, "*** we tried to get message %d but failed\n", i));
                break;
            }
        }
    }
    
    camel_object_trigger_event (CAMEL_OBJECT (folder), "folder_changed", GINT_TO_POINTER (0));
}