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

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

/* 
 * Authors: Bertrand Guiheneuf <bertrand@helixcode.com> 
 *          Michael Zucchi <notzed@helixcode.com>
 *
 * Copyright (C) 1999, 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 "camel-mbox-folder.h"
#include "camel-mbox-store.h"
#include "string-utils.h"
#include "camel-stream-fs.h"
#include "camel-mbox-summary.h"
#include "camel-data-wrapper.h"
#include "camel-mime-message.h"
#include "camel-stream-filter.h"
#include "camel-mime-filter-from.h"
#include "camel-exception.h"

#define d(x)

static CamelFolderClass *parent_class=NULL;

/* Returns the class for a CamelMboxFolder */
#define CMBOXF_CLASS(so) CAMEL_MBOX_FOLDER_CLASS (GTK_OBJECT(so)->klass)
#define CF_CLASS(so) CAMEL_FOLDER_CLASS (GTK_OBJECT(so)->klass)
#define CMBOXS_CLASS(so) CAMEL_STORE_CLASS (GTK_OBJECT(so)->klass)


static void mbox_init (CamelFolder *folder, CamelStore *parent_store,
           CamelFolder *parent_folder, const gchar *name,
           gchar separator, CamelException *ex);

static void mbox_open (CamelFolder *folder, CamelFolderOpenMode mode, CamelException *ex);
static void mbox_close (CamelFolder *folder, gboolean expunge, CamelException *ex);
static gint mbox_get_message_count (CamelFolder *folder, CamelException *ex);
static void mbox_append_message (CamelFolder *folder, CamelMimeMessage *message, CamelException *ex);
static GPtrArray *mbox_get_uids (CamelFolder *folder, CamelException *ex);
static GPtrArray *mbox_get_subfolder_names (CamelFolder *folder, CamelException *ex);
static GPtrArray *mbox_get_summary (CamelFolder *folder, CamelException *ex);
static void mbox_free_summary (CamelFolder *folder, GPtrArray *array);
static CamelMimeMessage *mbox_get_message_by_uid (CamelFolder *folder, const gchar *uid, CamelException *ex);

static void mbox_expunge (CamelFolder *folder, CamelException *ex);
#if 0
static void _copy_message_to (CamelFolder *folder, CamelMimeMessage *message, CamelFolder *dest_folder, CamelException *ex);
static const gchar *_get_message_uid (CamelFolder *folder, CamelMimeMessage *message, CamelException *ex);
#endif

static void mbox_delete_message_by_uid(CamelFolder *folder, const gchar *uid, CamelException *ex);

static const CamelMessageInfo *mbox_summary_get_by_uid(CamelFolder *f, const char *uid);

static GList *mbox_search_by_expression(CamelFolder *folder, const char *expression, CamelException *ex);

static void mbox_finalize (GtkObject *object);

static void
camel_mbox_folder_class_init (CamelMboxFolderClass *camel_mbox_folder_class)
{
    CamelFolderClass *camel_folder_class = CAMEL_FOLDER_CLASS (camel_mbox_folder_class);
    GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (camel_folder_class);

    parent_class = gtk_type_class (camel_folder_get_type ());
        
    /* virtual method definition */

    /* virtual method overload */
    camel_folder_class->init = mbox_init;
    camel_folder_class->open = mbox_open;
    camel_folder_class->close = mbox_close;
    camel_folder_class->get_message_count = mbox_get_message_count;
    camel_folder_class->append_message = mbox_append_message;
    camel_folder_class->get_uids = mbox_get_uids;
    camel_folder_class->get_subfolder_names = mbox_get_subfolder_names;
    camel_folder_class->get_summary = mbox_get_summary;
    camel_folder_class->free_summary = mbox_free_summary;
    camel_folder_class->expunge = mbox_expunge;

    camel_folder_class->get_message_by_uid = mbox_get_message_by_uid;
    camel_folder_class->delete_message_by_uid = mbox_delete_message_by_uid;

    camel_folder_class->search_by_expression = mbox_search_by_expression;

    camel_folder_class->summary_get_by_uid = mbox_summary_get_by_uid;

    gtk_object_class->finalize = mbox_finalize;
    
}

static void           
mbox_finalize (GtkObject *object)
{
    CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (object);

    g_free (mbox_folder->folder_file_path);
    g_free (mbox_folder->summary_file_path);
    g_free (mbox_folder->folder_dir_path);
    g_free (mbox_folder->index_file_path);

    GTK_OBJECT_CLASS (parent_class)->finalize (object);
}

GtkType
camel_mbox_folder_get_type (void)
{
    static GtkType camel_mbox_folder_type = 0;
    
    if (!camel_mbox_folder_type)    {
        GtkTypeInfo camel_mbox_folder_info =    
        {
            "CamelMboxFolder",
            sizeof (CamelMboxFolder),
            sizeof (CamelMboxFolderClass),
            (GtkClassInitFunc) camel_mbox_folder_class_init,
            (GtkObjectInitFunc) NULL,
                /* reserved_1 */ NULL,
                /* reserved_2 */ NULL,
            (GtkClassInitFunc) NULL,
        };
        
        camel_mbox_folder_type = gtk_type_unique (CAMEL_FOLDER_TYPE, &camel_mbox_folder_info);
    }
    
    return camel_mbox_folder_type;
}

static void 
mbox_init (CamelFolder *folder, CamelStore *parent_store,
       CamelFolder *parent_folder, const gchar *name, gchar separator,
       CamelException *ex)
{
    CamelMboxFolder *mbox_folder = (CamelMboxFolder *)folder;
    const gchar *root_dir_path;

    /* call parent method */
    parent_class->init (folder, parent_store, parent_folder,
                name, separator, ex);
    if (camel_exception_get_id (ex))
        return;

    /* we assume that the parent init
       method checks for the existance of @folder */
    folder->can_hold_messages = TRUE;
    folder->can_hold_folders = TRUE;
    folder->has_summary_capability = TRUE;
    folder->has_search_capability = TRUE;

    folder->permanent_flags = CAMEL_MESSAGE_ANSWERED |
        CAMEL_MESSAGE_DELETED |
        CAMEL_MESSAGE_DRAFT |
        CAMEL_MESSAGE_FLAGGED |
        CAMEL_MESSAGE_SEEN |
        CAMEL_MESSAGE_USER;

    mbox_folder->summary = NULL;
    mbox_folder->search = NULL;

    /* now set the name info */
    g_free (mbox_folder->folder_file_path);
    g_free (mbox_folder->folder_dir_path);
    g_free (mbox_folder->index_file_path);

    root_dir_path = camel_mbox_store_get_toplevel_dir (CAMEL_MBOX_STORE(folder->parent_store));

    mbox_folder->folder_file_path = g_strdup_printf ("%s/%s", root_dir_path, folder->full_name);
    mbox_folder->summary_file_path = g_strdup_printf ("%s/%s-ev-summary", root_dir_path, folder->full_name);
    mbox_folder->folder_dir_path = g_strdup_printf ("%s/%s.sdb", root_dir_path, folder->full_name);
    mbox_folder->index_file_path = g_strdup_printf ("%s/%s.ibex", root_dir_path, folder->full_name);
}

static void
mbox_open (CamelFolder *folder, CamelFolderOpenMode mode, CamelException *ex)
{
    CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);
    int forceindex;
    struct stat st;

    /* call parent class */
    parent_class->open (folder, mode, ex);
    if (camel_exception_get_id(ex))
        return;

    /* if we have no index file, force it */
    forceindex = stat(mbox_folder->index_file_path, &st) == -1;

    printf("loading ibex\n");
    mbox_folder->index = ibex_open(mbox_folder->index_file_path, O_CREAT|O_RDWR, 0600);
    printf("loaded ibex\n");
    if (mbox_folder->index == NULL) {
        /* yes, this isn't fatal at all */
        g_warning("Could not open/create index file: %s: indexing not performed",
              strerror(errno));
    }

    /* no summary (disk or memory), and we're proverbially screwed */
    printf("loading summary\n");
    mbox_folder->summary = camel_mbox_summary_new(mbox_folder->summary_file_path, mbox_folder->folder_file_path, mbox_folder->index);
    if (mbox_folder->summary == NULL
        || camel_mbox_summary_load(mbox_folder->summary, forceindex) == -1) {
        camel_exception_set (ex, 
                     CAMEL_EXCEPTION_FOLDER_INVALID, /* FIXME: right error code */
                     "Could not create summary");
        return;
    }
    printf("summary loaded\n");
}

static void
mbox_close (CamelFolder *folder, gboolean expunge, CamelException *ex)
{
    CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);

    /* call parent implementation */
    parent_class->close (folder, expunge, ex);

    if (expunge) {
        mbox_expunge(folder, ex);
    }

    /* save index */
    if (mbox_folder->index) {
        ibex_close(mbox_folder->index);
        mbox_folder->index = NULL;
    }
    if (mbox_folder->summary) {
        camel_folder_summary_save ((CamelFolderSummary *)mbox_folder->summary);
        gtk_object_unref((GtkObject *)mbox_folder->summary);
        mbox_folder->summary = NULL;
    }
    if (mbox_folder->search) {
        gtk_object_unref((GtkObject *)mbox_folder->search);
        mbox_folder->search = NULL;
    }
}

static void
mbox_expunge (CamelFolder *folder, CamelException *ex)
{
    CamelMboxFolder *mbox = (CamelMboxFolder *)folder;

    if (camel_mbox_summary_expunge(mbox->summary) == -1) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_FOLDER_INVALID, /* FIXME: right error code */
                      "Could not expunge: %s", strerror(errno));
    }

    /* TODO: check it actually changed */
    gtk_signal_emit_by_name((GtkObject *)folder, "folder_changed", 0);
}

static gint
mbox_get_message_count (CamelFolder *folder, CamelException *ex)
{
    CamelMboxFolder *mbox_folder = (CamelMboxFolder *)folder;

    g_assert (folder);
    g_assert (mbox_folder->summary);
    
    return camel_folder_summary_count((CamelFolderSummary *)mbox_folder->summary);
}

/* FIXME: this may need some tweaking for performance? */
static void
mbox_append_message (CamelFolder *folder, CamelMimeMessage *message, CamelException *ex)
{
    CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);
    CamelStream *output_stream = NULL, *filter_stream = NULL;
    CamelMimeFilter *filter_from = NULL;
    struct stat st;
    off_t seek = -1;
    char *xev;
    guint32 uid;

    if (stat(mbox_folder->folder_file_path, &st) != 0)
        goto fail;

    output_stream = camel_stream_fs_new_with_name (mbox_folder->folder_file_path, O_RDWR, 0600);
    if (output_stream == NULL)
        goto fail;

    seek = camel_seekable_stream_seek((CamelSeekableStream *)output_stream, st.st_size, SEEK_SET);
    if (seek != st.st_size)
        goto fail;

    /* assign a new x-evolution header/uid */
    camel_medium_remove_header((CamelMedium *)message, "X-Evolution");
    uid = camel_folder_summary_next_uid((CamelFolderSummary *)mbox_folder->summary);
    xev = g_strdup_printf("%08x-%04x", uid, message->flags & 0xffff);
    camel_medium_add_header((CamelMedium *)message, "X-Evolution", xev);
    g_free(xev);

    /* we must write this to the non-filtered stream ... */
    if (camel_stream_write_string (output_stream, "From - \n") == -1)
        goto fail;

    /* and write the content to the filtering stream, that translated '\nFrom' into '\n>From' */
    filter_stream = (CamelStream *)camel_stream_filter_new_with_stream(output_stream);
    filter_from = (CamelMimeFilter *)camel_mime_filter_from_new();
    camel_stream_filter_add((CamelStreamFilter *)filter_stream, filter_from);
    if (camel_data_wrapper_write_to_stream (CAMEL_DATA_WRAPPER (message), filter_stream) == -1)
        goto fail;

    if (camel_stream_close (filter_stream) == -1)
        goto fail;

    /* filter stream ref's the output stream itself, so we need to unref it too */
    gtk_object_unref (GTK_OBJECT (filter_from));
    gtk_object_unref (GTK_OBJECT (filter_stream));
    gtk_object_unref (GTK_OBJECT (output_stream));

    /* force a summary update - will only update from the new position, if it can */
    camel_mbox_summary_update(mbox_folder->summary, seek);
    return;

fail:
    if (camel_exception_is_set (ex)) {
        camel_exception_setv (ex, camel_exception_get_id (ex),
                      "Cannot append message to mbox file: %s",
                      camel_exception_get_description (ex));
    } else {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      "Cannot append message to mbox file: %s",
                      g_strerror (errno));
    }
    if (filter_stream) {
        /*camel_stream_close (filter_stream);*/
        gtk_object_unref ((GtkObject *)filter_stream);
    }
    if (output_stream)
        gtk_object_unref ((GtkObject *)output_stream);

    if (filter_from)
        gtk_object_unref ((GtkObject *)filter_from);

    /* make sure the file isn't munged by us */
    if (seek != -1) {
        int fd = open(mbox_folder->folder_file_path, O_WRONLY, 0600);
        if (fd != -1) {
            ftruncate(fd, st.st_size);
            close(fd);
        }
    }
}

static GPtrArray *
mbox_get_uids (CamelFolder *folder, CamelException *ex) 
{
    GPtrArray *array;
    CamelMboxFolder *mbox_folder = (CamelMboxFolder *)folder;
    int i, count;

    count = camel_folder_summary_count((CamelFolderSummary *)mbox_folder->summary);
    array = g_ptr_array_new ();
    g_ptr_array_set_size (array, count);
    for (i=0;i<count;i++) {
        CamelMboxMessageInfo *info = (CamelMboxMessageInfo *)camel_folder_summary_index((CamelFolderSummary *)mbox_folder->summary, i);
        array->pdata[i] = g_strdup(info->info.uid);
    }
    
    return array;
}

static GPtrArray *
mbox_get_subfolder_names (CamelFolder *folder, CamelException *ex)
{
    /* No subfolders. */
    return g_ptr_array_new ();
}

static void
mbox_delete_message_by_uid(CamelFolder *folder, const gchar *uid, CamelException *ex)
{
    CamelMessageInfo *info;
    CamelMboxFolder *mf = (CamelMboxFolder *)folder;

    info = camel_folder_summary_uid((CamelFolderSummary *)mf->summary, uid);
    if (info) {
        info->flags |=  CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_FOLDER_FLAGGED;
        camel_folder_summary_touch((CamelFolderSummary *)mf->summary);
    }
}

/* track flag changes in the summary */
static void
message_changed(CamelMimeMessage *m, int type, CamelMboxFolder *mf)
{
    CamelMessageInfo *info;
    CamelFlag *flag;

    printf("Message changed: %s: %d\n", m->message_uid, type);
    switch (type) {
    case MESSAGE_FLAGS_CHANGED:
        info = camel_folder_summary_uid((CamelFolderSummary *)mf->summary, m->message_uid);
        if (info) {
            info->flags = m->flags | CAMEL_MESSAGE_FOLDER_FLAGGED;
            camel_flag_list_free(&info->user_flags);
            flag = m->user_flags;
            while (flag) {
                camel_flag_set(&info->user_flags, flag->name, TRUE);
                flag = flag->next;
            }
            camel_folder_summary_touch((CamelFolderSummary *)mf->summary);
        } else
            g_warning("Message changed event on message not in summary: %s", m->message_uid);
        break;
    default:
        printf("Unhandled message change event: %d\n", type);
        break;
    }
}

static CamelMimeMessage *
mbox_get_message_by_uid (CamelFolder *folder, const gchar *uid, CamelException *ex)
{
    CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);
    CamelStream *message_stream = NULL;
    CamelMimeMessage *message = NULL;
    CamelMboxMessageInfo *info;
    CamelMimeParser *parser = NULL;
    char *buffer;
    int len;

    /* get the message summary info */
    info = (CamelMboxMessageInfo *)camel_folder_summary_uid((CamelFolderSummary *)mbox_folder->summary, uid);

    if (info == NULL) {
        errno = ENOENT;
        goto fail;
    }

    /* if this has no content, its an error in the library */
    g_assert(info->info.content);
    g_assert(info->frompos != -1);

    /* where we read from */
    message_stream = camel_stream_fs_new_with_name (mbox_folder->folder_file_path, O_RDONLY, 0);
    if (message_stream == NULL)
        goto fail;

    /* we use a parser to verify the message is correct, and in the correct position */
    parser = camel_mime_parser_new();
    camel_mime_parser_init_with_stream(parser, message_stream);
    gtk_object_unref((GtkObject *)message_stream);
    camel_mime_parser_scan_from(parser, TRUE);

    camel_mime_parser_seek(parser, info->frompos, SEEK_SET);
    if (camel_mime_parser_step(parser, &buffer, &len) != HSCAN_FROM) {
        g_warning("File appears truncated");
        goto fail;
    }

    if (camel_mime_parser_tell_start_from(parser) != info->frompos) {
        g_warning("Summary doesn't match the folder contents!  eek!\n"
              "  expecting offset %ld got %ld", (long int)info->frompos,
              (long int)camel_mime_parser_tell_start_from(parser));
        errno = EINVAL;
        goto fail;
    }

    message = camel_mime_message_new();
    if (camel_mime_part_construct_from_parser((CamelMimePart *)message, parser) == -1) {
        g_warning("Construction failed");
        goto fail;
    }

    /* we're constructed, finish setup and clean up */
    message->folder = folder;
    gtk_object_ref((GtkObject *)folder);
    message->message_uid = g_strdup(uid);
    message->flags = info->info.flags;
    gtk_signal_connect((GtkObject *)message, "message_changed", message_changed, folder);

    gtk_object_unref((GtkObject *)parser);

    return message;

fail:
    camel_exception_setv (ex, CAMEL_EXCEPTION_FOLDER_INVALID_UID,
                  "Cannot get message: %s",
                  g_strerror(errno));

    if (parser)
        gtk_object_unref((GtkObject *)parser);
    if (message)
        gtk_object_unref((GtkObject *)message);

    return NULL;
}

GPtrArray *
mbox_get_summary (CamelFolder *folder, CamelException *ex)
{
    CamelMboxFolder *mbox_folder = (CamelMboxFolder *)folder;

    return ((CamelFolderSummary *)mbox_folder->summary)->messages;
}

void
mbox_free_summary (CamelFolder *folder, GPtrArray *array)
{
    /* no-op */
}

/* get a single message info, by uid */
static const CamelMessageInfo *
mbox_summary_get_by_uid(CamelFolder *f, const char *uid)
{
    CamelMboxFolder *mbox_folder = (CamelMboxFolder *)f;

    return camel_folder_summary_uid((CamelFolderSummary *)mbox_folder->summary, uid);
}

static GList *
mbox_search_by_expression(CamelFolder *folder, const char *expression, CamelException *ex)
{
    CamelMboxFolder *mbox_folder = (CamelMboxFolder *)folder;

    if (mbox_folder->search == NULL) {
        mbox_folder->search = camel_folder_search_new();
    }

    camel_folder_search_set_folder(mbox_folder->search, folder);
    if (mbox_folder->summary)
        /* FIXME: dont access summary array directly? */
        camel_folder_search_set_summary(mbox_folder->search, ((CamelFolderSummary *)mbox_folder->summary)->messages);
    camel_folder_search_set_body_index(mbox_folder->search, mbox_folder->index);

    return camel_folder_search_execute_expression(mbox_folder->search, expression, ex);
}