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path: root/mail/em-utils.c
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/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Jeffrey Stedfast <fejj@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

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

#include <glib/gstdio.h>

#ifdef G_OS_WIN32
/* Work around namespace clobbage in <windows.h> */
#define DATADIR windows_DATADIR
#include <windows.h>
#undef DATADIR
#undef interface
#endif

#include <libebook/e-book.h>

#include "em-filter-editor.h"

#include <glib/gi18n.h>

#include <gio/gio.h>

#include "mail-mt.h"
#include "mail-ops.h"
#include "mail-tools.h"
#include "e-mail-tag-editor.h"

#include <libedataserver/e-data-server-util.h>
#include <libedataserver/e-flag.h>
#include <libedataserver/e-proxy.h>
#include "e-util/e-util.h"
#include "e-util/e-util-private.h"
#include "e-util/e-mktemp.h"
#include "e-util/e-account-utils.h"
#include "e-util/e-dialog-utils.h"
#include "e-util/e-alert-dialog.h"
#include "shell/e-shell.h"
#include "widgets/misc/e-attachment.h"

#include "em-utils.h"
#include "em-composer-utils.h"
#include "em-format-quote.h"
#include "e-mail-folder-utils.h"
#include "e-mail-local.h"
#include "e-mail-session.h"

/* XXX This is a dirty hack on a dirty hack.  We really need
 *     to rework or get rid of the functions that use this. */
extern const gchar *shell_builtin_backend;

/* How many is too many? */
/* Used in em_util_ask_open_many() */
#define TOO_MANY 10

#define d(x)

gboolean
em_utils_ask_open_many (GtkWindow *parent,
                        gint how_many)
{
    gchar *string;
    gboolean proceed;

    if (how_many < TOO_MANY)
        return TRUE;

    string = g_strdup_printf (ngettext (
        /* Translators: This message is shown only for ten or more
         * messages to be opened.  The %d is replaced with the actual
         * count of messages. If you need a '%' in your text, then
         * write it doubled, like '%%'. */
        "Are you sure you want to open %d message at once?",
        "Are you sure you want to open %d messages at once?",
        how_many), how_many);
    proceed = em_utils_prompt_user (
        parent, "/apps/evolution/mail/prompts/open_many",
        "mail:ask-open-many", string, NULL);
    g_free (string);

    return proceed;
}

/**
 * em_utils_prompt_user:
 * @parent: parent window
 * @promptkey: gconf key to check if we should prompt the user or not.
 * @tag: e_alert tag.
 *
 * Convenience function to query the user with a Yes/No dialog and a
 * "Do not show this dialog again" checkbox. If the user checks that
 * checkbox, then @promptkey is set to %FALSE, otherwise it is set to
 * %TRUE.
 *
 * Returns %TRUE if the user clicks Yes or %FALSE otherwise.
 **/
gboolean
em_utils_prompt_user (GtkWindow *parent,
                      const gchar *promptkey,
                      const gchar *tag,
                      ...)
{
    GtkWidget *dialog;
    GtkWidget *check = NULL;
    GtkWidget *container;
    va_list ap;
    gint button;
    GConfClient *client;
    EAlert *alert = NULL;

    client = gconf_client_get_default ();

    if (promptkey && !gconf_client_get_bool (client, promptkey, NULL)) {
        g_object_unref (client);
        return TRUE;
    }

    va_start (ap, tag);
    alert = e_alert_new_valist (tag, ap);
    va_end (ap);

    dialog = e_alert_dialog_new (parent, alert);
    g_object_unref (alert);

    container = e_alert_dialog_get_content_area (E_ALERT_DIALOG (dialog));

    if (promptkey) {
        check = gtk_check_button_new_with_mnemonic (
            _("_Do not show this message again"));
        gtk_box_pack_start (
            GTK_BOX (container), check, FALSE, FALSE, 0);
        gtk_widget_show (check);
    }

    button = gtk_dialog_run (GTK_DIALOG (dialog));
    if (promptkey)
        gconf_client_set_bool (
            client, promptkey,
            !gtk_toggle_button_get_active (
            GTK_TOGGLE_BUTTON (check)), NULL);

    gtk_widget_destroy (dialog);

    g_object_unref (client);

    return button == GTK_RESPONSE_YES;
}

/**
 * em_utils_uids_copy:
 * @uids: array of uids
 *
 * Duplicates the array of uids held by @uids into a new
 * GPtrArray. Use em_utils_uids_free() to free the resultant uid
 * array.
 *
 * Returns a duplicate copy of @uids.
 **/
GPtrArray *
em_utils_uids_copy (GPtrArray *uids)
{
    GPtrArray *copy;
    gint i;

    copy = g_ptr_array_new ();
    g_ptr_array_set_size (copy, uids->len);

    for (i = 0; i < uids->len; i++)
        copy->pdata[i] = g_strdup (uids->pdata[i]);

    return copy;
}

/**
 * em_utils_uids_free:
 * @uids: array of uids
 *
 * Frees the array of uids pointed to by @uids back to the system.
 **/
void
em_utils_uids_free (GPtrArray *uids)
{
    gint i;

    for (i = 0; i < uids->len; i++)
        g_free (uids->pdata[i]);

    g_ptr_array_free (uids, TRUE);
}

/**
 * em_utils_check_user_can_send_mail:
 *
 * Returns %TRUE if the user has an account configured (to send mail)
 * or %FALSE otherwise.
 **/
gboolean
em_utils_check_user_can_send_mail (void)
{
    EAccountList *account_list;
    EAccount *account;

    account_list = e_get_account_list ();

    if (e_list_length (E_LIST (account_list)) == 0)
        return FALSE;

    if (!(account = e_get_default_account ()))
        return FALSE;

    /* Check for a transport */
    if (!account->transport->url)
        return FALSE;

    return TRUE;
}

/* Editing Filters/Search Folders... */

static GtkWidget *filter_editor = NULL;

static void
em_filter_editor_response (GtkWidget *dialog, gint button, gpointer user_data)
{
    EMFilterContext *fc;

    if (button == GTK_RESPONSE_OK) {
        const gchar *config_dir;
        gchar *user;

        config_dir = mail_session_get_config_dir ();
        fc = g_object_get_data ((GObject *) dialog, "context");
        user = g_build_filename (config_dir, "filters.xml", NULL);
        e_rule_context_save ((ERuleContext *) fc, user);
        g_free (user);
    }

    gtk_widget_destroy (dialog);

    filter_editor = NULL;
}

static EMFilterSource em_filter_source_element_names[] = {
    { "incoming", },
    { "outgoing", },
    { NULL }
};

/**
 * em_utils_edit_filters:
 * @parent: parent window
 * @backend: an #EMailBAckend
 *
 * Opens or raises the filters editor dialog so that the user may edit
 * his/her filters. If @parent is non-NULL, then the dialog will be
 * created as a child window of @parent's toplevel window.
 **/
void
em_utils_edit_filters (GtkWidget *parent,
                       EMailBackend *backend)
{
    const gchar *config_dir;
    gchar *user, *system;
    EMFilterContext *fc;

    g_return_if_fail (E_IS_MAIL_BACKEND (backend));

    if (filter_editor) {
        gtk_window_present (GTK_WINDOW (filter_editor));
        return;
    }

    config_dir = mail_session_get_config_dir ();

    fc = em_filter_context_new (backend);
    user = g_build_filename (config_dir, "filters.xml", NULL);
    system = g_build_filename (EVOLUTION_PRIVDATADIR, "filtertypes.xml", NULL);
    e_rule_context_load ((ERuleContext *) fc, system, user);
    g_free (user);
    g_free (system);

    if (((ERuleContext *) fc)->error) {
        e_mail_backend_submit_alert (
            backend, "mail:filter-load-error",
            ((ERuleContext *) fc)->error, NULL);
        return;
    }

    if (em_filter_source_element_names[0].name == NULL) {
        em_filter_source_element_names[0].name = _("Incoming");
        em_filter_source_element_names[1].name = _("Outgoing");
    }

    filter_editor = (GtkWidget *) em_filter_editor_new (
        fc, em_filter_source_element_names);
    if (parent != NULL)
        gtk_window_set_transient_for (
            GTK_WINDOW (filter_editor),
            GTK_WINDOW (parent));

    gtk_window_set_title (
        GTK_WINDOW (filter_editor), _("Message Filters"));
    g_object_set_data_full (
        G_OBJECT (filter_editor), "context", fc,
        (GDestroyNotify) g_object_unref);
    g_signal_connect (
        filter_editor, "response",
        G_CALLBACK (em_filter_editor_response), NULL);
    gtk_widget_show (GTK_WIDGET (filter_editor));
}

/*
 * Picked this from e-d-s/libedataserver/e-data.
 * But it allows more characters to occur in filenames, especially
 * when saving attachment.
 */
void
em_filename_make_safe (gchar *string)
{
    gchar *p, *ts;
    gunichar c;
#ifdef G_OS_WIN32
    const gchar *unsafe_chars = "/\":*?<>|\\#";
#else
    const gchar *unsafe_chars = "/#";
#endif

    g_return_if_fail (string != NULL);
    p = string;

    while (p && *p) {
        c = g_utf8_get_char (p);
        ts = p;
        p = g_utf8_next_char (p);
        /* I wonder what this code is supposed to actually
         * achieve, and whether it does that as currently
         * written?
         */
        if (!g_unichar_isprint (c) || ( c < 0xff && strchr (unsafe_chars, c&0xff ))) {
            while (ts<p)
                *ts++ = '_';
        }
    }
}

/* ********************************************************************** */
/* Flag-for-Followup... */

/**
 * em_utils_flag_for_followup:
 * @reader: an #EMailReader
 * @folder: folder containing messages to flag
 * @uids: uids of messages to flag
 *
 * Open the Flag-for-Followup editor for the messages specified by
 * @folder and @uids.
 **/
void
em_utils_flag_for_followup (EMailReader *reader,
                            CamelFolder *folder,
                            GPtrArray *uids)
{
    EShell *shell;
    EMailBackend *backend;
    EShellSettings *shell_settings;
    EShellBackend *shell_backend;
    EMFormatHTML *formatter;
    GtkWidget *editor;
    GtkWindow *window;
    CamelTag *tags;
    gint i;

    g_return_if_fail (E_IS_MAIL_READER (reader));
    g_return_if_fail (CAMEL_IS_FOLDER (folder));
    g_return_if_fail (uids != NULL);

    window = e_mail_reader_get_window (reader);
    backend = e_mail_reader_get_backend (reader);

    editor = e_mail_tag_editor_new ();
    gtk_window_set_transient_for (GTK_WINDOW (editor), window);

    shell_backend = E_SHELL_BACKEND (backend);
    shell = e_shell_backend_get_shell (shell_backend);
    shell_settings = e_shell_get_shell_settings (shell);

    /* These settings come from the calendar module. */
    g_object_bind_property (
        shell_settings, "cal-use-24-hour-format",
        editor, "use-24-hour-format",
        G_BINDING_SYNC_CREATE);
    g_object_bind_property (
        shell_settings, "cal-week-start-day",
        editor, "week-start-day",
        G_BINDING_SYNC_CREATE);

    for (i = 0; i < uids->len; i++) {
        CamelMessageInfo *info;

        info = camel_folder_get_message_info (folder, uids->pdata[i]);

        if (info == NULL)
            continue;

        e_mail_tag_editor_add_message (
            E_MAIL_TAG_EDITOR (editor),
            camel_message_info_from (info),
            camel_message_info_subject (info));

        camel_folder_free_message_info (folder, info);
    }

    /* special-case... */
    if (uids->len == 1) {
        CamelMessageInfo *info;
        const gchar *message_uid;

        message_uid = g_ptr_array_index (uids, 0);
        info = camel_folder_get_message_info (folder, message_uid);
        if (info) {
            tags = (CamelTag *) camel_message_info_user_tags (info);

            if (tags)
                e_mail_tag_editor_set_tag_list (
                    E_MAIL_TAG_EDITOR (editor), tags);
            camel_folder_free_message_info (folder, info);
        }
    }

    if (gtk_dialog_run (GTK_DIALOG (editor)) != GTK_RESPONSE_OK)
        goto exit;

    tags = e_mail_tag_editor_get_tag_list (E_MAIL_TAG_EDITOR (editor));
    if (tags == NULL)
        goto exit;

    camel_folder_freeze (folder);
    for (i = 0; i < uids->len; i++) {
        CamelMessageInfo *info;
        CamelTag *iter;

        info = camel_folder_get_message_info (folder, uids->pdata[i]);

        if (info == NULL)
            continue;

        for (iter = tags; iter != NULL; iter = iter->next)
            camel_message_info_set_user_tag (
                info, iter->name, iter->value);

        camel_folder_free_message_info (folder, info);
    }

    camel_folder_thaw (folder);
    camel_tag_list_free (&tags);

    formatter = e_mail_reader_get_formatter (reader);
    em_format_queue_redraw (EM_FORMAT (formatter));

exit:
    /* XXX We shouldn't be freeing this. */
    em_utils_uids_free (uids);

    gtk_widget_destroy (GTK_WIDGET (editor));
}

/**
 * em_utils_flag_for_followup_clear:
 * @parent: parent window
 * @folder: folder containing messages to unflag
 * @uids: uids of messages to unflag
 *
 * Clears the Flag-for-Followup flag on the messages referenced by
 * @folder and @uids.
 **/
void
em_utils_flag_for_followup_clear (GtkWindow *parent,
                                  CamelFolder *folder,
                                  GPtrArray *uids)
{
    gint i;

    g_return_if_fail (GTK_IS_WINDOW (parent));
    g_return_if_fail (CAMEL_IS_FOLDER (folder));
    g_return_if_fail (uids != NULL);

    camel_folder_freeze (folder);
    for (i = 0; i < uids->len; i++) {
        CamelMessageInfo *mi = camel_folder_get_message_info (folder, uids->pdata[i]);

        if (mi) {
            camel_message_info_set_user_tag(mi, "follow-up", NULL);
            camel_message_info_set_user_tag(mi, "due-by", NULL);
            camel_message_info_set_user_tag(mi, "completed-on", NULL);
            camel_folder_free_message_info (folder, mi);
        }
    }

    camel_folder_thaw (folder);

    em_utils_uids_free (uids);
}

/**
 * em_utils_flag_for_followup_completed:
 * @parent: parent window
 * @folder: folder containing messages to 'complete'
 * @uids: uids of messages to 'complete'
 *
 * Sets the completed state (and date/time) for each message
 * referenced by @folder and @uids that is marked for
 * Flag-for-Followup.
 **/
void
em_utils_flag_for_followup_completed (GtkWindow *parent,
                                      CamelFolder *folder,
                                      GPtrArray *uids)
{
    gchar *now;
    gint i;

    g_return_if_fail (GTK_IS_WINDOW (parent));
    g_return_if_fail (CAMEL_IS_FOLDER (folder));
    g_return_if_fail (uids != NULL);

    now = camel_header_format_date (time (NULL), 0);

    camel_folder_freeze (folder);
    for (i = 0; i < uids->len; i++) {
        const gchar *tag;
        CamelMessageInfo *mi = camel_folder_get_message_info (folder, uids->pdata[i]);

        if (mi) {
            tag = camel_message_info_user_tag(mi, "follow-up");
            if (tag && tag[0])
                camel_message_info_set_user_tag(mi, "completed-on", now);
            camel_folder_free_message_info (folder, mi);
        }
    }

    camel_folder_thaw (folder);

    g_free (now);

    em_utils_uids_free (uids);
}

/* This kind of sucks, because for various reasons most callers need to run
 * synchronously in the gui thread, however this could take a long, blocking
 * time to run. */
static gint
em_utils_write_messages_to_stream (CamelFolder *folder,
                                   GPtrArray *uids,
                                   CamelStream *stream)
{
    CamelStream *filtered_stream;
    CamelMimeFilter *from_filter;
    gint i, res = 0;

    from_filter = camel_mime_filter_from_new ();
    filtered_stream = camel_stream_filter_new (stream);
    camel_stream_filter_add (
        CAMEL_STREAM_FILTER (filtered_stream), from_filter);
    g_object_unref (from_filter);

    for (i=0; i<uids->len; i++) {
        CamelMimeMessage *message;
        gchar *from;

        /* FIXME camel_folder_get_message_sync() may block. */
        message = camel_folder_get_message_sync (
            folder, uids->pdata[i], NULL, NULL);
        if (message == NULL) {
            res = -1;
            break;
        }

        /* We need to flush after each stream write since we are
         * writing to the same stream. */
        from = camel_mime_message_build_mbox_from (message);

        if (camel_stream_write_string (stream, from, NULL, NULL) == -1
            || camel_stream_flush (stream, NULL, NULL) == -1
            || camel_data_wrapper_write_to_stream_sync (
            (CamelDataWrapper *) message, (CamelStream *)
            filtered_stream, NULL, NULL) == -1
            || camel_stream_flush (
            (CamelStream *) filtered_stream, NULL, NULL) == -1)
            res = -1;

        g_free (from);
        g_object_unref (message);

        if (res == -1)
            break;
    }

    g_object_unref (filtered_stream);

    return res;
}

/* This kind of sucks, because for various reasons most callers need to run
 * synchronously in the gui thread, however this could take a long, blocking
 * time to run. */
static gint
em_utils_read_messages_from_stream (CamelFolder *folder,
                                    CamelStream *stream)
{
    CamelMimeParser *mp = camel_mime_parser_new ();
    gboolean success = TRUE;

    camel_mime_parser_scan_from (mp, TRUE);
    camel_mime_parser_init_with_stream (mp, stream, NULL);

    while (camel_mime_parser_step (mp, NULL, NULL) == CAMEL_MIME_PARSER_STATE_FROM) {
        CamelMimeMessage *msg;
        gboolean success;

        /* NB: de-from filter, once written */
        msg = camel_mime_message_new ();
        if (!camel_mime_part_construct_from_parser_sync (
            (CamelMimePart *) msg, mp, NULL, NULL)) {
            g_object_unref (msg);
            break;
        }

        /* FIXME camel_folder_append_message_sync() may block. */
        success = camel_folder_append_message_sync (
            folder, msg, NULL, NULL, NULL, NULL);
        g_object_unref (msg);

        if (!success)
            break;

        camel_mime_parser_step (mp, NULL, NULL);
    }

    g_object_unref (mp);

    return success ? 0 : -1;
}

/**
 * em_utils_selection_set_mailbox:
 * @data: selection data
 * @folder: folder containign messages to copy into the selection
 * @uids: uids of the messages to copy into the selection
 *
 * Creates a mailbox-format selection.
 * Warning: Could be BIG!
 * Warning: This could block the ui for an extended period.
 **/
void
em_utils_selection_set_mailbox (GtkSelectionData *data,
                                CamelFolder *folder,
                                GPtrArray *uids)
{
    GByteArray *byte_array;
    CamelStream *stream;
    GdkAtom target;

    target = gtk_selection_data_get_target (data);

    byte_array = g_byte_array_new ();
    stream = camel_stream_mem_new_with_byte_array (byte_array);

    if (em_utils_write_messages_to_stream (folder, uids, stream) == 0)
        gtk_selection_data_set (
            data, target, 8,
            byte_array->data, byte_array->len);

    g_object_unref (stream);
}

/**
 * em_utils_selection_get_mailbox:
 * @selection_data: selection data
 * @folder:
 *
 * Receive a mailbox selection/dnd
 * Warning: Could be BIG!
 * Warning: This could block the ui for an extended period.
 * FIXME: Exceptions?
 **/
void
em_utils_selection_get_mailbox (GtkSelectionData *selection_data,
                                CamelFolder *folder)
{
    CamelStream *stream;
    const guchar *data;
    gint length;

    data = gtk_selection_data_get_data (selection_data);
    length = gtk_selection_data_get_length (selection_data);

    if (data == NULL || length == -1)
        return;

    /* TODO: a stream mem with read-only access to existing data? */
    /* NB: Although copying would let us run this async ... which it should */
    stream = (CamelStream *)
        camel_stream_mem_new_with_buffer ((gchar *) data, length);
    em_utils_read_messages_from_stream (folder, stream);
    g_object_unref (stream);
}

/**
 * em_utils_selection_get_message:
 * @selection_data:
 * @folder:
 *
 * get a message/rfc822 data.
 **/
void
em_utils_selection_get_message (GtkSelectionData *selection_data,
                                CamelFolder *folder)
{
    CamelStream *stream;
    CamelMimeMessage *msg;
    const guchar *data;
    gint length;

    data = gtk_selection_data_get_data (selection_data);
    length = gtk_selection_data_get_length (selection_data);

    if (data == NULL || length == -1)
        return;

    stream = (CamelStream *)
        camel_stream_mem_new_with_buffer ((gchar *) data, length);
    msg = camel_mime_message_new ();
    if (camel_data_wrapper_construct_from_stream_sync (
        (CamelDataWrapper *) msg, stream, NULL, NULL))
        /* FIXME camel_folder_append_message_sync() may block. */
        camel_folder_append_message_sync (
            folder, msg, NULL, NULL, NULL, NULL);
    g_object_unref (msg);
    g_object_unref (stream);
}

/**
 * em_utils_selection_set_uidlist:
 * @selection_data: selection data
 * @folder:
 * @uids:
 *
 * Sets a "x-uid-list" format selection data.
 **/
void
em_utils_selection_set_uidlist (GtkSelectionData *selection_data,
                                CamelFolder *folder,
                                GPtrArray *uids)
{
    GByteArray *array = g_byte_array_new ();
    GdkAtom target;
    gchar *folder_uri;
    gint i;

    /* format: "uri\0uid1\0uid2\0uid3\0...\0uidn\0" */

    folder_uri = e_mail_folder_uri_from_folder (folder);

    g_byte_array_append (
        array, (guchar *) folder_uri, strlen (folder_uri) + 1);

    for (i=0; i<uids->len; i++)
        g_byte_array_append (array, uids->pdata[i], strlen (uids->pdata[i])+1);

    target = gtk_selection_data_get_target (selection_data);
    gtk_selection_data_set (
        selection_data, target, 8, array->data, array->len);
    g_byte_array_free (array, TRUE);

    g_free (folder_uri);
}

/**
 * em_utils_selection_get_uidlist:
 * @data: selection data
 * @session: an #EMailSession
 * @move: do we delete the messages.
 *
 * Convert a uid list into a copy/move operation.
 *
 * Warning: Could take some time to run.
 **/
void
em_utils_selection_get_uidlist (GtkSelectionData *selection_data,
                                EMailSession *session,
                                CamelFolder *dest,
                                gint move,
                                GCancellable *cancellable,
                                GError **error)
{
    /* format: "uri\0uid1\0uid2\0uid3\0...\0uidn" */
    gchar *inptr, *inend;
    GPtrArray *uids;
    CamelFolder *folder;
    const guchar *data;
    gint length;

    g_return_if_fail (selection_data != NULL);
    g_return_if_fail (E_IS_MAIL_SESSION (session));

    data = gtk_selection_data_get_data (selection_data);
    length = gtk_selection_data_get_length (selection_data);

    if (data == NULL || length == -1)
        return;

    uids = g_ptr_array_new ();

    inptr = (gchar *) data;
    inend = (gchar *) (data + length);
    while (inptr < inend) {
        gchar *start = inptr;

        while (inptr < inend && *inptr)
            inptr++;

        if (start > (gchar *) data)
            g_ptr_array_add (uids, g_strndup (start, inptr-start));

        inptr++;
    }

    if (uids->len == 0) {
        g_ptr_array_free (uids, TRUE);
        return;
    }

    /* FIXME e_mail_session_uri_to_folder_sync() may block. */
    folder = e_mail_session_uri_to_folder_sync (
        session, (gchar *) data, 0, cancellable, error);
    if (folder) {
        /* FIXME camel_folder_transfer_messages_to_sync() may block. */
        camel_folder_transfer_messages_to_sync (
            folder, uids, dest, move, NULL, cancellable, error);
        g_object_unref (folder);
    }

    em_utils_uids_free (uids);
}

/**
 * em_utils_selection_set_urilist:
 * @data:
 * @folder:
 * @uids:
 *
 * Set the selection data @data to a uri which points to a file, which is
 * a berkely mailbox format mailbox.  The file is automatically cleaned
 * up when the application quits.
 **/
void
em_utils_selection_set_urilist (GtkSelectionData *data,
                                CamelFolder *folder,
                                GPtrArray *uids)
{
    gchar *tmpdir;
    CamelStream *fstream;
    gchar *uri, *file = NULL, *tmpfile;
    gint fd;
    CamelMessageInfo *info;

    tmpdir = e_mkdtemp("drag-n-drop-XXXXXX");
    if (tmpdir == NULL)
        return;

    /* Try to get the drop filename from the message or folder */
    if (uids->len == 1) {
        const gchar *message_uid;

        message_uid = g_ptr_array_index (uids, 0);
        info = camel_folder_get_message_info (folder, message_uid);
        if (info) {
            file = g_strdup (camel_message_info_subject (info));
            camel_folder_free_message_info (folder, info);
        }
    }

    /* TODO: Handle conflicts? */
    if (file == NULL) {
        /* Drop filename for messages from a mailbox */
        file = g_strdup_printf (
            _("Messages from %s"),
            camel_folder_get_display_name (folder));
    }

    e_filename_make_safe (file);

    tmpfile = g_build_filename (tmpdir, file, NULL);
    g_free (tmpdir);
    g_free (file);

    fd = g_open (tmpfile, O_WRONLY | O_CREAT | O_EXCL | O_BINARY, 0666);
    if (fd == -1) {
        g_free (tmpfile);
        return;
    }

    uri = g_filename_to_uri (tmpfile, NULL, NULL);
    g_free (tmpfile);
    fstream = camel_stream_fs_new_with_fd (fd);
    if (fstream) {
        if (em_utils_write_messages_to_stream (folder, uids, fstream) == 0) {
            /* terminate with \r\n to be compliant with the spec */
            gchar *uri_crlf = g_strconcat(uri, "\r\n", NULL);
            GdkAtom target;

            target = gtk_selection_data_get_target (data);
            gtk_selection_data_set (
                data, target, 8, (guchar *)
                uri_crlf, strlen (uri_crlf));
            g_free (uri_crlf);
        }

        g_object_unref (fstream);
    } else
        close (fd);

    g_free (uri);
}

/**
 * em_utils_selection_set_urilist:
 * @data:
 * @folder:
 * @uids:
 *
 * Get the selection data @data from a uri list which points to a
 * file, which is a berkely mailbox format mailbox.  The file is
 * automatically cleaned up when the application quits.
 **/
void
em_utils_selection_get_urilist (GtkSelectionData *selection_data,
                                CamelFolder *folder)
{
    CamelStream *stream;
    CamelURL *url;
    gint fd, i, res = 0;
    gchar **uris;

    d(printf(" * drop uri list\n"));

    uris = gtk_selection_data_get_uris (selection_data);

    for (i=0;res == 0 && uris[i];i++) {
        g_strstrip (uris[i]);
        if (uris[i][0] == '#')
            continue;

        url = camel_url_new (uris[i], NULL);
        if (url == NULL)
            continue;

        if (strcmp(url->protocol, "file") == 0
            && (fd = g_open (url->path, O_RDONLY | O_BINARY, 0)) != -1) {
            stream = camel_stream_fs_new_with_fd (fd);
            if (stream) {
                res = em_utils_read_messages_from_stream (folder, stream);
                g_object_unref (stream);
            } else
                close (fd);
        }
        camel_url_free (url);
    }

    g_strfreev (uris);
}

/**
 * em_utils_folder_is_templates:
 * @folder: a #CamelFolder
 *
 * Decides if @folder is a Templates folder.
 *
 * Returns %TRUE if this is a Templates folder or %FALSE otherwise.
 **/

gboolean
em_utils_folder_is_templates (CamelFolder *folder)
{
    CamelFolder *local_templates_folder;
    CamelSession *session;
    CamelStore *store;
    EAccountList *account_list;
    EIterator *iterator;
    gchar *folder_uri;
    gboolean is_templates = FALSE;

    g_return_val_if_fail (CAMEL_IS_FOLDER (folder), FALSE);

    local_templates_folder =
        e_mail_local_get_folder (E_MAIL_LOCAL_FOLDER_TEMPLATES);

    if (folder == local_templates_folder)
        return TRUE;

    folder_uri = e_mail_folder_uri_from_folder (folder);

    store = camel_folder_get_parent_store (folder);
    session = camel_service_get_session (CAMEL_SERVICE (store));

    account_list = e_get_account_list ();
    iterator = e_list_get_iterator (E_LIST (account_list));

    while (!is_templates && e_iterator_is_valid (iterator)) {
        EAccount *account;

        /* XXX EIterator misuses const. */
        account = (EAccount *) e_iterator_get (iterator);

        if (account->templates_folder_uri != NULL)
            is_templates = e_mail_folder_uri_equal (
                session, folder_uri,
                account->templates_folder_uri);

        e_iterator_next (iterator);
    }

    g_object_unref (iterator);
    g_free (folder_uri);

    return is_templates;
}

/**
 * em_utils_folder_is_drafts:
 * @folder: a #CamelFolder
 *
 * Decides if @folder is a Drafts folder.
 *
 * Returns %TRUE if this is a Drafts folder or %FALSE otherwise.
 **/
gboolean
em_utils_folder_is_drafts (CamelFolder *folder)
{
    CamelFolder *local_drafts_folder;
    CamelSession *session;
    CamelStore *store;
    EAccountList *account_list;
    EIterator *iterator;
    gchar *folder_uri;
    gboolean is_drafts = FALSE;

    g_return_val_if_fail (CAMEL_IS_FOLDER (folder), FALSE);

    local_drafts_folder =
        e_mail_local_get_folder (E_MAIL_LOCAL_FOLDER_DRAFTS);

    if (folder == local_drafts_folder)
        return TRUE;

    folder_uri = e_mail_folder_uri_from_folder (folder);

    store = camel_folder_get_parent_store (folder);
    session = camel_service_get_session (CAMEL_SERVICE (store));

    account_list = e_get_account_list ();
    iterator = e_list_get_iterator (E_LIST (account_list));

    while (!is_drafts && e_iterator_is_valid (iterator)) {
        EAccount *account;

        /* XXX EIterator misuses const. */
        account = (EAccount *) e_iterator_get (iterator);

        if (account->drafts_folder_uri != NULL)
            is_drafts = e_mail_folder_uri_equal (
                session, folder_uri,
                account->drafts_folder_uri);

        e_iterator_next (iterator);
    }

    g_object_unref (iterator);
    g_free (folder_uri);

    return is_drafts;
}

/**
 * em_utils_folder_is_sent:
 * @folder: a #CamelFolder
 *
 * Decides if @folder is a Sent folder.
 *
 * Returns %TRUE if this is a Sent folder or %FALSE otherwise.
 **/
gboolean
em_utils_folder_is_sent (CamelFolder *folder)
{
    CamelFolder *local_sent_folder;
    CamelSession *session;
    CamelStore *store;
    EAccountList *account_list;
    EIterator *iterator;
    gchar *folder_uri;
    gboolean is_sent = FALSE;

    g_return_val_if_fail (CAMEL_IS_FOLDER (folder), FALSE);

    local_sent_folder =
        e_mail_local_get_folder (E_MAIL_LOCAL_FOLDER_SENT);

    if (folder == local_sent_folder)
        return TRUE;

    folder_uri = e_mail_folder_uri_from_folder (folder);

    store = camel_folder_get_parent_store (folder);
    session = camel_service_get_session (CAMEL_SERVICE (store));

    account_list = e_get_account_list ();
    iterator = e_list_get_iterator (E_LIST (account_list));

    while (!is_sent && e_iterator_is_valid (iterator)) {
        EAccount *account;

        /* XXX EIterator misuses const. */
        account = (EAccount *) e_iterator_get (iterator);

        if (account->sent_folder_uri != NULL)
            is_sent = e_mail_folder_uri_equal (
                session, folder_uri,
                account->sent_folder_uri);

        e_iterator_next (iterator);
    }

    g_object_unref (iterator);
    g_free (folder_uri);

    return is_sent;
}

/**
 * em_utils_folder_is_outbox:
 * @folder: a #CamelFolder
 *
 * Decides if @folder is an Outbox folder.
 *
 * Returns %TRUE if this is an Outbox folder or %FALSE otherwise.
 **/
gboolean
em_utils_folder_is_outbox (CamelFolder *folder)
{
    CamelFolder *local_outbox_folder;

    g_return_val_if_fail (CAMEL_IS_FOLDER (folder), FALSE);

    local_outbox_folder =
        e_mail_local_get_folder (E_MAIL_LOCAL_FOLDER_OUTBOX);

    return (folder == local_outbox_folder);
}

/* ********************************************************************** */
static EProxy *emu_proxy = NULL;
static GStaticMutex emu_proxy_lock = G_STATIC_MUTEX_INIT;

/* encode to string this way, because soup_uri_to_string doesn't include passwords */
static gchar *
suri_to_string (SoupURI *suri)
{
    GString *uri;
    gchar *tmp;

    if (!suri)
        return NULL;

    uri = g_string_sized_new (20);

    if (suri->scheme)
        g_string_append_printf (uri, "%s:", suri->scheme);
    if (suri->host) {
        g_string_append (uri, "//");
        if (suri->user) {
            tmp = soup_uri_encode (suri->user, ":/;#@?\\");
            g_string_append (uri, tmp);
            g_free (tmp);
        }

        if (suri->password) {
            g_string_append_c (uri, ':');
            tmp = soup_uri_encode (suri->password, ":/;#@?\\");
            g_string_append (uri, tmp);
            g_free (tmp);
        }

        if (suri->user || suri->password)
            g_string_append_c (uri, '@');

        if (strchr (suri->host, ':')) {
            g_string_append_c (uri, '[');
            g_string_append (uri, suri->host);
            g_string_append_c (uri, ']');
        } else {
            tmp = soup_uri_encode (suri->host, ":/");
            g_string_append (uri, tmp);
            g_free (tmp);
        }

        if (suri->port && !soup_uri_uses_default_port (suri))
            g_string_append_printf (uri, ":%d", suri->port);
        if (!suri->path && (suri->query || suri->fragment))
            g_string_append_c (uri, '/');
    }

    if (suri->path && *suri->path)
        g_string_append (uri, suri->path);

    if (suri->query) {
        g_string_append_c (uri, '?');
        g_string_append (uri, suri->query);
    }
    if (suri->fragment) {
        g_string_append_c (uri, '#');
        g_string_append (uri, suri->fragment);
    }

    return g_string_free (uri, FALSE);
}

static gpointer
emu_proxy_setup (gpointer data)
{
    if (!emu_proxy) {
        emu_proxy = e_proxy_new ();
        e_proxy_setup_proxy (emu_proxy);
        /* not necessary to listen for changes here */
    }

    return NULL;
}

/**
 * em_utils_get_proxy_uri:
 *
 * Get the system proxy uri for 'pUri'.
 *
 * Return value: Must be freed when finished with.
 **/
gchar *
em_utils_get_proxy_uri (const gchar *pUri)
{
    gchar *uri = NULL;

    g_static_mutex_lock (&emu_proxy_lock);

    if (!emu_proxy) {
        mail_call_main (MAIL_CALL_p_p, (MailMainFunc) emu_proxy_setup, NULL);
    }

    if (e_proxy_require_proxy_for_uri (emu_proxy, pUri))
        uri = suri_to_string (e_proxy_peek_uri_for (emu_proxy, pUri));

    g_static_mutex_unlock (&emu_proxy_lock);

    return uri;
}

/**
 * em_utils_message_to_html:
 * @message:
 * @credits:
 * @flags: EMFormatQuote flags
 * @source:
 * @append: Text to append, can be NULL.
 * @validity_found: if not NULL, then here will be set what validities
 *         had been found during message conversion. Value is a bit OR
 *         of EM_FORMAT_VALIDITY_FOUND_* constants.
 *
 * Convert a message to html, quoting if the @credits attribution
 * string is given.
 *
 * Return value: The html version as a NULL terminated string.
 **/
gchar *
em_utils_message_to_html (CamelMimeMessage *message,
                          const gchar *credits,
                          guint32 flags,
                          EMFormat *source,
                          const gchar *append,
                          guint32 *validity_found)
{
    EMFormatQuote *emfq;
    CamelStream *mem;
    GByteArray *buf;

    buf = g_byte_array_new ();
    mem = camel_stream_mem_new ();
    camel_stream_mem_set_byte_array (CAMEL_STREAM_MEM (mem), buf);

    emfq = em_format_quote_new (credits, mem, flags);
    ((EMFormat *) emfq)->composer = TRUE;

    if (!source) {
        GConfClient *gconf;
        gchar *charset;

        /* FIXME We should be getting this from the
         *       current view, not the global setting. */
        gconf = gconf_client_get_default ();
        charset = gconf_client_get_string (
            gconf, "/apps/evolution/mail/display/charset", NULL);
        em_format_set_default_charset ((EMFormat *) emfq, charset);
        g_object_unref (gconf);
        g_free (charset);
    }

    /* FIXME Not passing a GCancellable here. */
    em_format_format_clone (
        EM_FORMAT (emfq), NULL, NULL, message, source, NULL);
    if (validity_found)
        *validity_found = ((EMFormat *)emfq)->validity_found;
    g_object_unref (emfq);

    if (append && *append)
        camel_stream_write_string (mem, append, NULL, NULL);

    camel_stream_write(mem, "", 1, NULL, NULL);
    g_object_unref (mem);

    return (gchar *) g_byte_array_free (buf, FALSE);
}

/* ********************************************************************** */

/**
 * em_utils_expunge_folder:
 * @parent: parent window
 * @session: #EMailSession
 * @folder: folder to expunge
 *
 * Expunges @folder.
 **/
void
em_utils_expunge_folder (GtkWidget *parent, EMailSession *session, CamelFolder *folder)
{
    const gchar *description;

    description = camel_folder_get_description (folder);

    if (!em_utils_prompt_user (
        GTK_WINDOW (parent),
        "/apps/evolution/mail/prompts/expunge",
        "mail:ask-expunge", description, NULL))
        return;

    mail_expunge_folder (session, folder, NULL, NULL);
}

/**
 * em_utils_empty_trash:
 * @parent: parent window
 * @session: an #EMailSession
 *
 * Empties all Trash folders.
 **/
void
em_utils_empty_trash (GtkWidget *parent,
                      EMailSession *session)
{
    CamelProvider *provider;
    EAccountList *account_list;
    EAccount *account;
    EIterator *iterator;

    g_return_if_fail (E_IS_MAIL_SESSION (session));

    if (!em_utils_prompt_user ((GtkWindow *) parent,
        "/apps/evolution/mail/prompts/empty_trash",
        "mail:ask-empty-trash", NULL))
        return;

    account_list = e_get_account_list ();
    iterator = e_list_get_iterator (E_LIST (account_list));

    while (e_iterator_is_valid (iterator)) {
        account = (EAccount *) e_iterator_get (iterator);

        /* make sure this is a valid source */
        if (account->enabled && account->source->url) {
            provider = camel_provider_get (account->source->url, NULL);
            if (provider) {
                /* make sure this store is a remote store */
                if (provider->flags & CAMEL_PROVIDER_IS_STORAGE) {
                    mail_empty_trash (session, account, NULL, NULL);
                }
            }
        }

        e_iterator_next (iterator);
    }

    g_object_unref (iterator);

    /* Now empty the local trash folder */
    mail_empty_trash (session, NULL, NULL, NULL);
}

/* ********************************************************************** */

/* runs sync, in main thread */
static gpointer
emu_addr_setup (gpointer user_data)
{
    GError *err = NULL;
    ESourceList **psource_list = user_data;

    if (!e_book_get_addressbooks (psource_list, &err))
        g_error_free (err);

    return NULL;
}

static void
emu_addr_cancel_book (gpointer data)
{
    EBook **pbook = data;
    GError *err = NULL;

    g_return_if_fail (pbook != NULL);

    if (*pbook) {
        /* we dunna care if this fails, its just the best we can try */
        e_book_cancel (*pbook, &err);
        g_clear_error (&err);
    }
}

static void
emu_addr_cancel_stop (gpointer data)
{
    gboolean *stop = data;

    g_return_if_fail (stop != NULL);

    *stop = TRUE;
}

struct TryOpenEBookStruct {
    GError **error;
    EFlag *flag;
    gboolean result;
};

static void
try_open_e_book_cb (EBook *book, const GError *error, gpointer closure)
{
    struct TryOpenEBookStruct *data = (struct TryOpenEBookStruct *) closure;

    if (!data)
        return;

    data->result = error == NULL;

    if (!data->result) {
        g_clear_error (data->error);
        g_propagate_error (data->error, g_error_copy (error));
    }

    e_flag_set (data->flag);
}

/**
 * try_open_e_book:
 * Tries to open address book asynchronously, but acts as synchronous.
 * The advantage is it checks periodically whether the camel_operation
 * has been canceled or not, and if so, then stops immediately, with
 * result FALSE. Otherwise returns same as e_book_open
 **/
static gboolean
try_open_e_book (EBook *book, gboolean only_if_exists, GError **error)
{
    struct TryOpenEBookStruct data;
    gboolean canceled = FALSE;
    EFlag *flag = e_flag_new ();

    data.error = error;
    data.flag = flag;
    data.result = FALSE;

    if (!e_book_open_async (book, only_if_exists, try_open_e_book_cb, &data)) {
        e_flag_free (flag);
        g_clear_error (error);
        g_set_error (
            error, E_BOOK_ERROR,
            E_BOOK_ERROR_OTHER_ERROR,
            "Failed to call e_book_open_async.");
        return FALSE;
    }

    while (canceled = camel_operation_cancel_check (NULL),
            !canceled && !e_flag_is_set (flag)) {
        GTimeVal wait;

        g_get_current_time (&wait);
        g_time_val_add (&wait, 250000); /* waits 250ms */

        e_flag_timed_wait (flag, &wait);
    }

    if (canceled) {
        g_clear_error (error);
        g_set_error (
            error, E_BOOK_ERROR,
            E_BOOK_ERROR_CANCELLED,
            "Operation has been canceled.");
        /* if the operation is cancelled sucessfully set the flag
         * else wait. file, groupwise,.. backend's operations
         * are not cancellable */
        if (e_book_cancel_async_op (book, NULL))
            e_flag_set (flag);
    }

    e_flag_wait (flag);
    e_flag_free (flag);

    return data.result && (!error || !*error);
}

#define NOT_FOUND_BOOK (GINT_TO_POINTER (1))

G_LOCK_DEFINE_STATIC (contact_cache);

/* key is lowercased contact email; value is EBook pointer
 * (just for comparison) where it comes from */
static GHashTable *contact_cache = NULL;

/* key is source ID; value is pointer to EBook */
static GHashTable *emu_books_hash = NULL;

/* key is source ID; value is same pointer as key; this is hash of
 * broken books, which failed to open for some reason */
static GHashTable *emu_broken_books_hash = NULL;

static ESourceList *emu_books_source_list = NULL;

static gboolean
search_address_in_addressbooks (const gchar *address,
                                gboolean local_only,
                                gboolean (*check_contact) (EContact *contact,
                                                           gpointer user_data),
                                gpointer user_data)
{
    gboolean found = FALSE, stop = FALSE, found_any = FALSE;
    gchar *lowercase_addr;
    gpointer ptr;
    EBookQuery *query;
    GSList *s, *g, *addr_sources = NULL;

    if (!address || !*address)
        return FALSE;

    G_LOCK (contact_cache);

    if (!emu_books_source_list) {
        mail_call_main (
            MAIL_CALL_p_p, (MailMainFunc)
            emu_addr_setup, &emu_books_source_list);
        emu_books_hash = g_hash_table_new_full (
            g_str_hash, g_str_equal, g_free, g_object_unref);
        emu_broken_books_hash = g_hash_table_new_full (
            g_str_hash, g_str_equal, g_free, NULL);
        contact_cache = g_hash_table_new_full (
            g_str_hash, g_str_equal, g_free, NULL);
    }

    if (!emu_books_source_list) {
        G_UNLOCK (contact_cache);
        return FALSE;
    }

    lowercase_addr = g_utf8_strdown (address, -1);
    ptr = g_hash_table_lookup (contact_cache, lowercase_addr);
    if (ptr != NULL && (check_contact == NULL || ptr == NOT_FOUND_BOOK)) {
        g_free (lowercase_addr);
        G_UNLOCK (contact_cache);
        return ptr != NOT_FOUND_BOOK;
    }

    query = e_book_query_field_test (E_CONTACT_EMAIL, E_BOOK_QUERY_IS, address);

    for (g = e_source_list_peek_groups (emu_books_source_list);
            g; g = g_slist_next (g)) {
        ESourceGroup *group = g->data;

        if (!group)
            continue;

        if (local_only && !(e_source_group_peek_base_uri (group) &&
            g_str_has_prefix (
            e_source_group_peek_base_uri (group), "local:")))
            continue;

        for (s = e_source_group_peek_sources (group); s; s = g_slist_next (s)) {
            ESource *source = s->data;
            const gchar *completion = e_source_get_property (source, "completion");

            if (completion && g_ascii_strcasecmp (completion, "true") == 0) {
                addr_sources = g_slist_prepend (addr_sources, g_object_ref (source));
            }
        }
    }

    for (s = addr_sources; !stop && !found && s; s = g_slist_next (s)) {
        ESource *source = s->data;
        GList *contacts;
        EBook *book = NULL;
        GHook *hook_book, *hook_stop;
        gboolean cached_book = FALSE;
        GError *err = NULL;

        /* failed to load this book last time, skip it now */
        if (g_hash_table_lookup (emu_broken_books_hash,
                e_source_peek_uid (source)) != NULL) {
            d(printf ("%s: skipping broken book '%s'\n",
                G_STRFUNC, e_source_peek_name (source)));
            continue;
        }

        d(printf(" checking '%s'\n", e_source_get_uri(source)));

        hook_book = mail_cancel_hook_add (emu_addr_cancel_book, &book);
        hook_stop = mail_cancel_hook_add (emu_addr_cancel_stop, &stop);

        book = g_hash_table_lookup (emu_books_hash, e_source_peek_uid (source));
        if (!book) {
            book = e_book_new (source, &err);

            if (book == NULL) {
                if (err && g_error_matches (
                    err, E_BOOK_ERROR,
                    E_BOOK_ERROR_CANCELLED)) {
                    stop = TRUE;
                } else if (err) {
                    gchar *source_uid;

                    source_uid = g_strdup (
                        e_source_peek_uid (source));

                    g_hash_table_insert (
                        emu_broken_books_hash,
                        source_uid, source_uid);

                    g_warning (
                        "%s: Unable to create addressbook '%s': %s",
                        G_STRFUNC,
                        e_source_peek_name (source),
                        err->message);
                }
                g_clear_error (&err);
            } else if (!stop && !try_open_e_book (book, TRUE, &err)) {
                g_object_unref (book);
                book = NULL;

                if (err && g_error_matches (
                    err, E_BOOK_ERROR,
                    E_BOOK_ERROR_CANCELLED)) {
                    stop = TRUE;
                } else if (err) {
                    gchar *source_uid;

                    source_uid = g_strdup (
                        e_source_peek_uid (source));

                    g_hash_table_insert (
                        emu_broken_books_hash,
                        source_uid, source_uid);

                    g_warning (
                        "%s: Unable to open addressbook '%s': %s",
                        G_STRFUNC,
                        e_source_peek_name (source),
                        err->message);
                }
                g_clear_error (&err);
            }
        } else {
            cached_book = TRUE;
        }

        if (book && !stop && e_book_get_contacts (book, query, &contacts, &err)) {
            if (contacts != NULL) {
                if (!found_any) {
                    g_hash_table_insert (
                        contact_cache,
                        g_strdup (lowercase_addr),
                        book);
                }
                found_any = TRUE;

                if (check_contact) {
                    GList *l;

                    for (l = contacts; l && !found; l = l->next) {
                        EContact *contact = l->data;

                        found = check_contact (contact, user_data);
                    }
                } else {
                    found = TRUE;
                }

                g_list_foreach (contacts, (GFunc) g_object_unref, NULL);
                g_list_free (contacts);
            }
        } else if (book) {
            stop = stop || (err && g_error_matches (
                err, E_BOOK_ERROR, E_BOOK_ERROR_CANCELLED));
            if (err && !stop) {
                gchar *source_uid = g_strdup (e_source_peek_uid (source));

                g_hash_table_insert (emu_broken_books_hash, source_uid, source_uid);

                g_warning (
                    "%s: Can't get contacts from '%s': %s",
                    G_STRFUNC, e_source_peek_name (source),
                    err->message);
            }
            g_clear_error (&err);
        }

        mail_cancel_hook_remove (hook_book);
        mail_cancel_hook_remove (hook_stop);

        stop = stop || camel_operation_cancel_check (NULL);

        if (stop && !cached_book && book) {
            g_object_unref (book);
        } else if (!stop && book && !cached_book) {
            g_hash_table_insert (
                emu_books_hash, g_strdup (
                e_source_peek_uid (source)), book);
        }
    }

    g_slist_foreach (addr_sources, (GFunc) g_object_unref, NULL);
    g_slist_free (addr_sources);

    e_book_query_unref (query);

    if (!found_any) {
        g_hash_table_insert (contact_cache, lowercase_addr, NOT_FOUND_BOOK);
        lowercase_addr = NULL;
    }

    G_UNLOCK (contact_cache);

    g_free (lowercase_addr);

    return found_any;
}

gboolean
em_utils_in_addressbook (CamelInternetAddress *iaddr, gboolean local_only)
{
    const gchar *addr;

    /* TODO: check all addresses? */
    if (iaddr == NULL || !camel_internet_address_get (iaddr, 0, NULL, &addr))
        return FALSE;

    return search_address_in_addressbooks (addr, local_only, NULL, NULL);
}

static gboolean
extract_photo_data (EContact *contact, gpointer user_data)
{
    EContactPhoto **photo = user_data;

    g_return_val_if_fail (contact != NULL, FALSE);
    g_return_val_if_fail (user_data != NULL, FALSE);

    *photo = e_contact_get (contact, E_CONTACT_PHOTO);
    if (!*photo)
        *photo = e_contact_get (contact, E_CONTACT_LOGO);

    return *photo != NULL;
}

typedef struct _PhotoInfo {
    gchar *address;
    EContactPhoto *photo;
} PhotoInfo;

static void
emu_free_photo_info (PhotoInfo *pi)
{
    if (!pi)
        return;

    if (pi->address)
        g_free (pi->address);
    if (pi->photo)
        e_contact_photo_free (pi->photo);
    g_free (pi);
}

G_LOCK_DEFINE_STATIC (photos_cache);
static GSList *photos_cache = NULL; /* list of PhotoInfo-s */

CamelMimePart *
em_utils_contact_photo (CamelInternetAddress *cia, gboolean local_only)
{
    const gchar *addr = NULL;
    CamelMimePart *part = NULL;
    EContactPhoto *photo = NULL;
    GSList *p, *first_not_null = NULL;
    gint count_not_null = 0;

    if (cia == NULL || !camel_internet_address_get (cia, 0, NULL, &addr) || !addr) {
        return NULL;
    }

    G_LOCK (photos_cache);

    /* search a cache first */
    for (p = photos_cache; p; p = p->next) {
        PhotoInfo *pi = p->data;

        if (!pi)
            continue;

        if (pi->photo) {
            if (!first_not_null)
                first_not_null = p;
            count_not_null++;
        }

        if (g_ascii_strcasecmp (addr, pi->address) == 0) {
            photo = pi->photo;
            break;
        }
    }

    /* !p means the address had not been found in the cache */
    if (!p && search_address_in_addressbooks (
            addr, local_only, extract_photo_data, &photo)) {
        PhotoInfo *pi;

        if (photo && photo->type != E_CONTACT_PHOTO_TYPE_INLINED) {
            e_contact_photo_free (photo);
            photo = NULL;
        }

        /* keep only up to 10 photos in memory */
        if (photo && count_not_null >= 10 && first_not_null) {
            pi = first_not_null->data;

            photos_cache = g_slist_remove (photos_cache, pi);

            emu_free_photo_info (pi);
        }

        pi = g_new0 (PhotoInfo, 1);
        pi->address = g_strdup (addr);
        pi->photo = photo;

        photos_cache = g_slist_append (photos_cache, pi);
    }

    /* some photo found, use it */
    if (photo) {
        /* Form a mime part out of the photo */
        part = camel_mime_part_new ();
        camel_mime_part_set_content (part,
                    (const gchar *) photo->data.inlined.data,
                    photo->data.inlined.length, "image/jpeg");
    }

    G_UNLOCK (photos_cache);

    return part;
}

/* list of email addresses (strings) to remove from local cache of photos and contacts,
   but only if the photo doesn't exist or is an not-found contact */
void
emu_remove_from_mail_cache (const GSList *addresses)
{
    const GSList *a;
    GSList *p;
    CamelInternetAddress *cia;

    cia = camel_internet_address_new ();

    for (a = addresses; a; a = a->next) {
        const gchar *addr = NULL;

        if (!a->data)
            continue;

        if (camel_address_decode ((CamelAddress *) cia, a->data) != -1 &&
            camel_internet_address_get (cia, 0, NULL, &addr) && addr) {
            gchar *lowercase_addr = g_utf8_strdown (addr, -1);

            G_LOCK (contact_cache);
            if (g_hash_table_lookup (contact_cache, lowercase_addr) == NOT_FOUND_BOOK)
                g_hash_table_remove (contact_cache, lowercase_addr);
            G_UNLOCK (contact_cache);

            g_free (lowercase_addr);

            G_LOCK (photos_cache);
            for (p = photos_cache; p; p = p->next) {
                PhotoInfo *pi = p->data;

                if (pi && !pi->photo && g_ascii_strcasecmp (pi->address, addr) == 0) {
                    photos_cache = g_slist_remove (photos_cache, pi);
                    emu_free_photo_info (pi);
                    break;
                }
            }
            G_UNLOCK (photos_cache);
        }
    }

    g_object_unref (cia);
}

void
emu_remove_from_mail_cache_1 (const gchar *address)
{
    GSList *l;

    g_return_if_fail (address != NULL);

    l = g_slist_append (NULL, (gpointer) address);

    emu_remove_from_mail_cache (l);

    g_slist_free (l);
}

/* frees all data created by call of em_utils_in_addressbook() or
 * em_utils_contact_photo() */
void
emu_free_mail_cache (void)
{
    G_LOCK (contact_cache);

    if (emu_books_hash) {
        g_hash_table_destroy (emu_books_hash);
        emu_books_hash = NULL;
    }

    if (emu_broken_books_hash) {
        g_hash_table_destroy (emu_broken_books_hash);
        emu_broken_books_hash = NULL;
    }

    if (emu_books_source_list) {
        g_object_unref (emu_books_source_list);
        emu_books_source_list = NULL;
    }

    if (contact_cache) {
        g_hash_table_destroy (contact_cache);
        contact_cache = NULL;
    }

    G_UNLOCK (contact_cache);

    G_LOCK (photos_cache);

    g_slist_foreach (photos_cache, (GFunc) emu_free_photo_info, NULL);
    g_slist_free (photos_cache);
    photos_cache = NULL;

    G_UNLOCK (photos_cache);
}

void
em_utils_clear_get_password_canceled_accounts_flag (void)
{
    EAccountList *account_list;
    EIterator *iterator;

    account_list = e_get_account_list ();

    for (iterator = e_list_get_iterator (E_LIST (account_list));
         e_iterator_is_valid (iterator);
         e_iterator_next (iterator)) {
        EAccount *account = (EAccount *) e_iterator_get (iterator);

        if (account && account->source)
            account->source->get_password_canceled = FALSE;

        if (account && account->transport)
            account->transport->get_password_canceled = FALSE;
    }

    g_object_unref (iterator);
}

gchar *
em_utils_url_unescape_amp (const gchar *url)
{
    gchar *buff;
    gint i, j, amps;

    if (!url)
        return NULL;

    amps = 0;
    for (i = 0; url[i]; i++) {
        if (url [i] == '&' && strncmp (url + i, "&amp;", 5) == 0)
            amps++;
    }

    buff = g_strdup (url);

    if (!amps)
        return buff;

    for (i = 0, j = 0; url[i]; i++, j++) {
        buff[j] = url[i];

        if (url [i] == '&' && strncmp (url + i, "&amp;", 5) == 0)
            i += 4;
    }
    buff[j] = 0;

    return buff;
}

static EAccount *
guess_account_from_folder (CamelFolder *folder)
{
    CamelStore *store;
    const gchar *uid;

    store = camel_folder_get_parent_store (folder);
    uid = camel_service_get_uid (CAMEL_SERVICE (store));

    return e_get_account_by_uid (uid);
}

static EAccount *
guess_account_from_message (CamelMimeMessage *message)
{
    const gchar *uid;

    uid = camel_mime_message_get_source (message);

    return (uid != NULL) ? e_get_account_by_uid (uid) : NULL;
}

GHashTable *
em_utils_generate_account_hash (void)
{
    GHashTable *account_hash;
    EAccount *account, *def;
    EAccountList *account_list;
    EIterator *iterator;

    account_list = e_get_account_list ();
    account_hash = g_hash_table_new (camel_strcase_hash, camel_strcase_equal);

    def = e_get_default_account ();

    iterator = e_list_get_iterator (E_LIST (account_list));

    while (e_iterator_is_valid (iterator)) {
        account = (EAccount *) e_iterator_get (iterator);

        if (account->id->address) {
            EAccount *acnt;

            /* Accounts with identical email addresses that are
             * enabled take precedence over the accounts that
             * aren't. If all accounts with matching email
             * addresses are disabled, then the first one in
             * the list takes precedence. The default account
             * always takes precedence no matter what. */
            acnt = g_hash_table_lookup (
                account_hash, account->id->address);
            if (acnt && acnt != def && !acnt->enabled && account->enabled) {
                g_hash_table_remove (
                    account_hash, acnt->id->address);
                acnt = NULL;
            }

            if (!acnt)
                g_hash_table_insert (
                    account_hash, (gchar *)
                    account->id->address,
                    (gpointer) account);
        }

        e_iterator_next (iterator);
    }

    g_object_unref (iterator);

    /* The default account has to be there if none
     * of the enabled accounts are present. */
    if (g_hash_table_size (account_hash) == 0 && def && def->id->address)
        g_hash_table_insert (
            account_hash, (gchar *)
            def->id->address,
            (gpointer) def);

    return account_hash;
}

EAccount *
em_utils_guess_account (CamelMimeMessage *message,
                        CamelFolder *folder)
{
    EAccount *account = NULL;

    g_return_val_if_fail (CAMEL_IS_MIME_MESSAGE (message), NULL);

    if (folder != NULL)
        g_return_val_if_fail (CAMEL_IS_FOLDER (folder), NULL);

    /* check for newsgroup header */
    if (folder != NULL
        && camel_medium_get_header (CAMEL_MEDIUM (message), "Newsgroups"))
        account = guess_account_from_folder (folder);

    /* check for source folder */
    if (account == NULL && folder != NULL)
        account = guess_account_from_folder (folder);

    /* then message source */
    if (account == NULL)
        account = guess_account_from_message (message);

    return account;
}

EAccount *
em_utils_guess_account_with_recipients (CamelMimeMessage *message,
                                        CamelFolder *folder)
{
    EAccount *account = NULL;
    EAccountList *account_list;
    GHashTable *recipients;
    EIterator *iterator;
    CamelInternetAddress *addr;
    const gchar *type;
    const gchar *key;

    /* This policy is subject to debate and tweaking,
     * but please also document the rational here. */

    g_return_val_if_fail (CAMEL_IS_MIME_MESSAGE (message), NULL);

    /* Build a set of email addresses in which to test for membership.
     * Only the keys matter here; the values just need to be non-NULL. */
    recipients = g_hash_table_new (g_str_hash, g_str_equal);

    type = CAMEL_RECIPIENT_TYPE_TO;
    addr = camel_mime_message_get_recipients (message, type);
    if (addr != NULL) {
        gint index = 0;

        while (camel_internet_address_get (addr, index++, NULL, &key))
            g_hash_table_insert (
                recipients, (gpointer) key,
                GINT_TO_POINTER (1));
    }

    type = CAMEL_RECIPIENT_TYPE_CC;
    addr = camel_mime_message_get_recipients (message, type);
    if (addr != NULL) {
        gint index = 0;

        while (camel_internet_address_get (addr, index++, NULL, &key))
            g_hash_table_insert (
                recipients, (gpointer) key,
                GINT_TO_POINTER (1));
    }

    /* First Preference: We were given a folder that maps to an
     * enabled account, and that account's email address appears
     * in the list of To: or Cc: recipients. */

    if (folder != NULL)
        account = guess_account_from_folder (folder);

    if (account == NULL || !account->enabled)
        goto second_preference;

    if ((key = account->id->address) == NULL)
        goto second_preference;

    if (g_hash_table_lookup (recipients, key) != NULL)
        goto exit;

second_preference:

    /* Second Preference: Choose any enabled account whose email
     * address appears in the list to To: or Cc: recipients. */

    account_list = e_get_account_list ();
    iterator = e_list_get_iterator (E_LIST (account_list));

    while (e_iterator_is_valid (iterator)) {
        account = (EAccount *) e_iterator_get (iterator);
        e_iterator_next (iterator);

        if (account == NULL || !account->enabled)
            continue;

        if ((key = account->id->address) == NULL)
            continue;

        if (g_hash_table_lookup (recipients, key) != NULL) {
            g_object_unref (iterator);
            goto exit;
        }
    }
    g_object_unref (iterator);

    /* Last Preference: Defer to em_utils_guess_account(). */
    account = em_utils_guess_account (message, folder);

exit:
    g_hash_table_destroy (recipients);

    return account;
}

void
emu_restore_folder_tree_state (EMFolderTree *folder_tree)
{
    EShell *shell;
    EShellBackend *backend;
    GKeyFile *key_file;
    const gchar *config_dir;
    gchar *filename;

    g_return_if_fail (folder_tree != NULL);
    g_return_if_fail (EM_IS_FOLDER_TREE (folder_tree));

    shell = e_shell_get_default ();
    backend = e_shell_get_backend_by_name (shell, "mail");
    g_return_if_fail (backend != NULL);

    config_dir = e_shell_backend_get_config_dir (backend);
    g_return_if_fail (config_dir != NULL);

    filename = g_build_filename (config_dir, "state.ini", NULL);

    key_file = g_key_file_new ();
    g_key_file_load_from_file (key_file, filename, 0, NULL);
    g_free (filename);

    em_folder_tree_restore_state (folder_tree, key_file);

    g_key_file_free (key_file);
}

/* Returns TRUE if CamelURL points to a local mbox file. */
gboolean
em_utils_is_local_delivery_mbox_file (CamelURL *url)
{
    g_return_val_if_fail (url != NULL, FALSE);

    return g_str_equal (url->protocol, "mbox") &&
        (url->path != NULL) &&
        g_file_test (url->path, G_FILE_TEST_EXISTS) &&
        !g_file_test (url->path, G_FILE_TEST_IS_DIR);
}