path: root/mail/mail-ops.c

/*
 * mail-ops.c: callbacks for the mail toolbar/menus
 *
 * 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:
 *      Dan Winship <danw@ximian.com>
 *      Jeffrey Stedfast <fejj@ximian.com>
 *      Peter Williams <peterw@ximian.com>
 *      Michael Zucchi <notzed@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <errno.h>

#include <glib/gstdio.h>
#include <glib/gi18n.h>

#include <libedataserver/e-data-server-util.h>
#include "e-util/e-account-utils.h"

#include "em-filter-rule.h"
#include "em-utils.h"
#include "mail-mt.h"
#include "mail-ops.h"
#include "mail-tools.h"

#include "e-mail-session.h"
#include "e-mail-session-utils.h"

#define w(x)
#define d(x)

/* XXX Make this a preprocessor definition. */
const gchar *x_mailer = "Evolution " VERSION SUB_VERSION " " VERSION_COMMENT;

/* used for both just filtering a folder + uid's, and for filtering a whole folder */
/* used both for fetching mail, and for filtering mail */
struct _filter_mail_msg {
    MailMsg base;

    EMailSession *session;
    CamelFolder *source_folder; /* where they come from */
    GPtrArray *source_uids; /* uids to copy, or NULL == copy all */
    CamelUIDCache *cache;  /* UID cache if we are to cache the uids, NULL otherwise */
    CamelFilterDriver *driver;
    gint delete;        /* delete messages after filtering them? */
    CamelFolder *destination; /* default destination for any messages, NULL for none */
};

/* since fetching also filters, we subclass the data here */
struct _fetch_mail_msg {
    struct _filter_mail_msg fmsg;

    CamelStore *store;
    GCancellable *cancellable;  /* we have our own cancellation
                     * struct, the other should be empty */
    gint keep;      /* keep on server? */

    void (*done)(gpointer data);
    gpointer data;
};

static gchar *
em_filter_folder_element_desc (struct _filter_mail_msg *m)
{
    return g_strdup (_("Filtering Selected Messages"));
}

/* filter a folder, or a subset thereof, uses source_folder/source_uids */
/* this is shared with fetch_mail */
static void
em_filter_folder_element_exec (struct _filter_mail_msg *m,
                               GCancellable *cancellable,
                               GError **error)
{
    CamelFolder *folder;
    GPtrArray *uids, *folder_uids = NULL;

    folder = m->source_folder;

    if (folder == NULL || camel_folder_get_message_count (folder) == 0)
        return;

    if (m->destination) {
        camel_folder_freeze (m->destination);
        camel_filter_driver_set_default_folder (m->driver, m->destination);
    }

    camel_folder_freeze (folder);

    if (m->source_uids)
        uids = m->source_uids;
    else
        folder_uids = uids = camel_folder_get_uids (folder);

    camel_filter_driver_filter_folder (
        m->driver, folder, m->cache, uids, m->delete,
        cancellable, error);
    camel_filter_driver_flush (m->driver, error);

    if (folder_uids)
        camel_folder_free_uids (folder, folder_uids);

    /* sync our source folder */
    if (!m->cache)
        camel_folder_synchronize_sync (
            folder, FALSE, cancellable, error);
    camel_folder_thaw (folder);

    if (m->destination)
        camel_folder_thaw (m->destination);

    /* this may thaw/unref source folders, do it here so we dont do
     * it in the main thread see also fetch_mail_fetch () below */
    g_object_unref (m->driver);
    m->driver = NULL;
}

static void
em_filter_folder_element_done (struct _filter_mail_msg *m)
{
}

static void
em_filter_folder_element_free (struct _filter_mail_msg *m)
{
    mail_session_flush_filter_log (m->session);

    if (m->session)
        g_object_unref (m->session);

    if (m->source_folder)
        g_object_unref (m->source_folder);

    if (m->source_uids)
        em_utils_uids_free (m->source_uids);

    if (m->destination)
        g_object_unref (m->destination);

    if (m->driver)
        g_object_unref (m->driver);
}

static MailMsgInfo em_filter_folder_element_info = {
    sizeof (struct _filter_mail_msg),
    (MailMsgDescFunc) em_filter_folder_element_desc,
    (MailMsgExecFunc) em_filter_folder_element_exec,
    (MailMsgDoneFunc) em_filter_folder_element_done,
    (MailMsgFreeFunc) em_filter_folder_element_free
};

void
mail_filter_folder (EMailSession *session,
                    CamelFolder *source_folder,
                    GPtrArray *uids,
                    const gchar *type,
                    gboolean notify)
{
    struct _filter_mail_msg *m;

    m = mail_msg_new (&em_filter_folder_element_info);
    m->session = g_object_ref (session);
    m->source_folder = g_object_ref (source_folder);
    m->source_uids = uids;
    m->cache = NULL;
    m->delete = FALSE;

    m->driver = camel_session_get_filter_driver (
        CAMEL_SESSION (session), type, NULL);

    if (!notify) {
        /* FIXME: have a #define NOTIFY_FILTER_NAME macro? */
        /* the filter name has to stay in sync with mail-session::get_filter_driver */
        camel_filter_driver_remove_rule_by_name (m->driver, "new-mail-notification");
    }

    mail_msg_unordered_push (m);
}

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

static gchar *
fetch_mail_desc (struct _fetch_mail_msg *m)
{
    return g_strdup (_("Fetching Mail"));
}

static void
fetch_mail_exec (struct _fetch_mail_msg *m,
                 GCancellable *cancellable,
                 GError **error)
{
    struct _filter_mail_msg *fm = (struct _filter_mail_msg *) m;
    CamelFolder *folder = NULL;
    CamelService *service;
    CamelSession *session;
    CamelURL *url;
    gboolean is_local_delivery;
    const gchar *uid;
    gint i;

    service = CAMEL_SERVICE (m->store);
    session = camel_service_get_session (service);

    fm->destination = e_mail_session_get_local_folder (
        E_MAIL_SESSION (session), E_MAIL_LOCAL_FOLDER_LOCAL_INBOX);
    if (fm->destination == NULL)
        goto fail;
    g_object_ref (fm->destination);

    url = camel_service_new_camel_url (service);
    is_local_delivery = em_utils_is_local_delivery_mbox_file (url);

    if (is_local_delivery) {
        gchar *path;
        gchar *url_string;

        path = mail_tool_do_movemail (m->store, error);
        url_string = camel_url_to_string (url, CAMEL_URL_HIDE_ALL);

        if (path && (!error || !*error)) {
            camel_folder_freeze (fm->destination);
            camel_filter_driver_set_default_folder (
                fm->driver, fm->destination);
            camel_filter_driver_filter_mbox (
                fm->driver, path, url_string,
                cancellable, error);
            camel_folder_thaw (fm->destination);

            if (!error || !*error)
                g_unlink (path);
        }

        g_free (path);
        g_free (url_string);
    } else {
        uid = camel_service_get_uid (service);

        folder = fm->source_folder =
            e_mail_session_get_inbox_sync (
                fm->session, uid, cancellable, error);
    }

    camel_url_free (url);

    if (folder != NULL) {
        /* This handles 'keep on server' stuff, if we have any new
         * uid's to copy across, we need to copy them to a new array
         * 'cause of the way fetch_mail_free works. */
        CamelUIDCache *cache = NULL;
        CamelStore *parent_store;
        CamelService *service;
        const gchar *data_dir;
        gchar *cachename;

        parent_store = camel_folder_get_parent_store (folder);

        service = CAMEL_SERVICE (parent_store);
        data_dir = camel_service_get_user_data_dir (service);

        cachename = g_build_filename (data_dir, "uid-cache", NULL);
        cache = camel_uid_cache_new (cachename);
        g_free (cachename);

        if (cache) {
            GPtrArray *folder_uids, *cache_uids, *uids;

            folder_uids = camel_folder_get_uids (folder);
            cache_uids = camel_uid_cache_get_new_uids (cache, folder_uids);
            if (cache_uids) {
                /* need to copy this, sigh */
                fm->source_uids = uids = g_ptr_array_new ();
                g_ptr_array_set_size (uids, cache_uids->len);
                for (i = 0; i < cache_uids->len; i++)
                    uids->pdata[i] = g_strdup (cache_uids->pdata[i]);
                camel_uid_cache_free_uids (cache_uids);

                fm->cache = cache;
                em_filter_folder_element_exec (fm, cancellable, error);

                /* need to uncancel so writes/etc. don't fail */
                if (g_cancellable_is_cancelled (m->cancellable))
                    g_cancellable_reset (m->cancellable);

                /* save the cache of uids that we've just downloaded */
                camel_uid_cache_save (cache);
            }

            if (fm->delete && (!error || !*error)) {
                /* not keep on server - just delete all
                 * the actual messages on the server */
                for (i = 0; i < folder_uids->len; i++) {
                    camel_folder_delete_message (
                        folder, folder_uids->pdata[i]);
                }
            }

            if ((fm->delete || cache_uids) && (!error || !*error)) {
                /* expunge messages (downloaded so far) */
                /* FIXME Not passing a GCancellable or GError here. */
                camel_folder_synchronize_sync (
                    folder, fm->delete, NULL, NULL);
            }

            camel_uid_cache_destroy (cache);
            camel_folder_free_uids (folder, folder_uids);
        } else {
            em_filter_folder_element_exec (fm, cancellable, error);
        }

        /* we unref the source folder here since we
         * may now block in finalize (we try to
         * disconnect cleanly) */
        g_object_unref (fm->source_folder);
        fm->source_folder = NULL;
    }

fail:
    /* we unref this here as it may have more work to do (syncing
     * folders and whatnot) before we are really done */
    /* should this be cancellable too? (i.e. above unregister above) */
    if (fm->driver) {
        g_object_unref (fm->driver);
        fm->driver = NULL;
    }

    /* also disconnect if not a local delivery mbox;
     * there is no need to keep the connection alive forever */
    if (!is_local_delivery)
        em_utils_disconnect_service_sync (
            service, TRUE, cancellable, NULL);
}

static void
fetch_mail_done (struct _fetch_mail_msg *m)
{
    if (m->done)
        m->done (m->data);
}

static void
fetch_mail_free (struct _fetch_mail_msg *m)
{
    if (m->store != NULL)
        g_object_unref (m->store);

    if (m->cancellable != NULL)
        g_object_unref (m->cancellable);

    em_filter_folder_element_free ((struct _filter_mail_msg *) m);
}

static MailMsgInfo fetch_mail_info = {
    sizeof (struct _fetch_mail_msg),
    (MailMsgDescFunc) fetch_mail_desc,
    (MailMsgExecFunc) fetch_mail_exec,
    (MailMsgDoneFunc) fetch_mail_done,
    (MailMsgFreeFunc) fetch_mail_free
};

/* ouch, a 'do everything' interface ... */
void
mail_fetch_mail (CamelStore *store,
                 gint keep,
                 const gchar *type,
                 GCancellable *cancellable,
                 CamelFilterGetFolderFunc get_folder,
                 gpointer get_data,
                 CamelFilterStatusFunc *status,
                 gpointer status_data,
                 void (*done)(gpointer data),
                 gpointer data)
{
    struct _fetch_mail_msg *m;
    struct _filter_mail_msg *fm;
    CamelSession *session;

    g_return_if_fail (CAMEL_IS_STORE (store));

    session = camel_service_get_session (CAMEL_SERVICE (store));

    m = mail_msg_new (&fetch_mail_info);
    fm = (struct _filter_mail_msg *) m;
    fm->session = g_object_ref (session);
    m->store = g_object_ref (store);
    fm->delete = !keep;
    fm->cache = NULL;
    if (cancellable)
        m->cancellable = g_object_ref (cancellable);
    m->done = done;
    m->data = data;

    fm->driver = camel_session_get_filter_driver (session, type, NULL);
    camel_filter_driver_set_folder_func (fm->driver, get_folder, get_data);
    if (status)
        camel_filter_driver_set_status_func (fm->driver, status, status_data);

    mail_msg_unordered_push (m);
}

static gchar *
escape_percent_sign (const gchar *str)
{
    GString *res;

    if (!str)
        return NULL;

    res = g_string_sized_new (strlen (str));
    while (*str) {
        if (*str == '%') {
            g_string_append (res, "%%");
        } else {
            g_string_append_c (res, *str);
        }

        str++;
    }

    return g_string_free (res, FALSE);
}

/* ********************************************************************** */
/* sending stuff */
/* ** SEND MAIL *********************************************************** */

static const gchar *normal_recipients[] = {
    CAMEL_RECIPIENT_TYPE_TO,
    CAMEL_RECIPIENT_TYPE_CC,
    CAMEL_RECIPIENT_TYPE_BCC
};

static const gchar *resent_recipients[] = {
    CAMEL_RECIPIENT_TYPE_RESENT_TO,
    CAMEL_RECIPIENT_TYPE_RESENT_CC,
    CAMEL_RECIPIENT_TYPE_RESENT_BCC
};

struct _send_queue_msg {
    MailMsg base;

    EMailBackend *backend;
    CamelFolder *queue;
    CamelTransport *transport;

    CamelFilterDriver *driver;

    /* we use camelfilterstatusfunc, even though its not the filter doing it */
    CamelFilterStatusFunc *status;
    gpointer status_data;

    void (*done)(gpointer data);
    gpointer data;
};

static void report_status       (struct _send_queue_msg *m,
                     enum camel_filter_status_t status,
                     gint pc,
                     const gchar *desc,
                     ...);

/* send 1 message to a specific transport */
static void
mail_send_message (struct _send_queue_msg *m,
                   CamelFolder *queue,
                   const gchar *uid,
                   CamelTransport *transport,
                   CamelFilterDriver *driver,
                   GCancellable *cancellable,
                   GError **error)
{
    EAccount *account = NULL;
    EMailSession *session;
    const CamelInternetAddress *iaddr;
    CamelAddress *from, *recipients;
    CamelMessageInfo *info = NULL;
    CamelProvider *provider;
    gchar *transport_uid = NULL;
    gchar *sent_folder_uri = NULL;
    const gchar *resent_from, *tmp;
    CamelFolder *folder = NULL;
    GString *err = NULL;
    struct _camel_header_raw *xev, *header;
    CamelMimeMessage *message;
    gint i;
    GError *local_error = NULL;

    message = camel_folder_get_message_sync (
        queue, uid, cancellable, error);
    if (!message)
        return;

    camel_medium_set_header (CAMEL_MEDIUM (message), "X-Mailer", x_mailer);

    err = g_string_new ("");
    xev = mail_tool_remove_xevolution_headers (message);

    session = e_mail_backend_get_session (m->backend);

    tmp = camel_header_raw_find (&xev, "X-Evolution-Account", NULL);
    if (tmp != NULL) {
        gchar *name;

        name = g_strstrip (g_strdup (tmp));
        if ((account = e_get_account_by_uid (name))
            /* 'old' x-evolution-account stored the name, how silly */
            || (account = e_get_account_by_name (name))) {
            if (account->transport) {
                CamelService *service;
                gchar *transport_uid;

                transport_uid = g_strconcat (
                    account->uid, "-transport", NULL);
                service = camel_session_get_service (
                    CAMEL_SESSION (session),
                    transport_uid);
                g_free (transport_uid);

                if (CAMEL_IS_TRANSPORT (service))
                    transport = CAMEL_TRANSPORT (service);
            }

            sent_folder_uri = g_strdup (account->sent_folder_uri);
        }
        g_free (name);
    }

    if (!account) {
        /* default back to these headers */
        tmp = camel_header_raw_find(&xev, "X-Evolution-Transport", NULL);
        if (tmp)
            transport_uid = g_strstrip (g_strdup (tmp));

        tmp = camel_header_raw_find(&xev, "X-Evolution-Fcc", NULL);
        if (tmp)
            sent_folder_uri = g_strstrip (g_strdup (tmp));
    }

    if (transport != NULL) {
        CamelURL *url;
        gchar *url_string;
        gchar *escaped;

        url = camel_service_new_camel_url (CAMEL_SERVICE (transport));
        url_string = camel_url_to_string (url, CAMEL_URL_HIDE_ALL);
        escaped = escape_percent_sign (url_string);
        camel_url_free (url);

        /* Let the dialog know the right account it is using. */
        report_status (m, CAMEL_FILTER_STATUS_ACTION, 0, escaped);

        g_free (escaped);
        g_free (url_string);
    }

    /* Check for email sending */
    from = (CamelAddress *) camel_internet_address_new ();
    resent_from = camel_medium_get_header (CAMEL_MEDIUM (message), "Resent-From");
    if (resent_from) {
        camel_address_decode (from, resent_from);
    } else {
        iaddr = camel_mime_message_get_from (message);
        camel_address_copy (from, CAMEL_ADDRESS (iaddr));
    }

    recipients = (CamelAddress *) camel_internet_address_new ();
    for (i = 0; i < 3; i++) {
        const gchar *type;

        type = resent_from ? resent_recipients[i] : normal_recipients[i];
        iaddr = camel_mime_message_get_recipients (message, type);
        camel_address_cat (recipients, CAMEL_ADDRESS (iaddr));
    }

    if (camel_address_length (recipients) > 0) {
        if (!em_utils_connect_service_sync (
            CAMEL_SERVICE (transport), cancellable, error))
            goto exit;

        if (!camel_transport_send_to_sync (
            transport, message, from,
            recipients, cancellable, error))
            goto exit;
    }

    /* Now check for posting, failures are ignored */
    info = camel_message_info_new (NULL);
    camel_message_info_set_flags (info, CAMEL_MESSAGE_SEEN, ~0);

    for (header = xev; header; header = header->next) {
        gchar *uri;

        if (strcmp(header->name, "X-Evolution-PostTo") != 0)
            continue;

        /* TODO: don't lose errors */

        uri = g_strstrip (g_strdup (header->value));
        /* FIXME Not passing a GCancellable or GError here. */
        folder = e_mail_session_uri_to_folder_sync (
            session, uri, 0, NULL, NULL);
        if (folder) {
            /* FIXME Not passing a GCancellable or GError here. */
            camel_folder_append_message_sync (
                folder, message, info, NULL, NULL, NULL);
            g_object_unref (folder);
            folder = NULL;
        }
        g_free (uri);
    }

    /* post process */
    mail_tool_restore_xevolution_headers (message, xev);

    if (driver) {
        camel_filter_driver_filter_message (
            driver, message, info, NULL, NULL,
            NULL, "", cancellable, &local_error);

        if (local_error != NULL) {
            if (g_error_matches (local_error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
                goto exit;

            /* sending mail, filtering failed */
            g_string_append_printf (
                err, _("Failed to apply outgoing filters: %s"),
                local_error->message);

            g_clear_error (&local_error);
        }
    }

    provider = camel_service_get_provider (CAMEL_SERVICE (transport));

    if (provider == NULL
        || !(provider->flags & CAMEL_PROVIDER_DISABLE_SENT_FOLDER)) {
        GError *local_error = NULL;

        if (sent_folder_uri) {
            folder = e_mail_session_uri_to_folder_sync (
                session, sent_folder_uri, 0,
                cancellable, &local_error);
            if (folder == NULL) {
                g_string_append_printf (
                    err, _("Failed to append to %s: %s\n"
                    "Appending to local 'Sent' folder instead."),
                    sent_folder_uri,
                    local_error ?
                        local_error->message :
                        _("Unknown error"));
                if (local_error)
                    g_clear_error (&local_error);
            }
        }

        if (!folder) {
            folder = e_mail_session_get_local_folder (
                session, E_MAIL_LOCAL_FOLDER_SENT);
            g_object_ref (folder);
        }

        if (!camel_folder_append_message_sync (
            folder, message, info,
            NULL, cancellable, &local_error)) {

            CamelFolder *sent_folder;

            if (g_error_matches (local_error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
                goto exit;

            sent_folder = e_mail_session_get_local_folder (
                session, E_MAIL_LOCAL_FOLDER_SENT);

            if (folder != sent_folder) {
                const gchar *description;

                description = camel_folder_get_description (folder);
                if (err->len)
                    g_string_append(err, "\n\n");
                g_string_append_printf (
                    err, _("Failed to append to %s: %s\n"
                    "Appending to local 'Sent' folder instead."),
                    description, local_error->message);
                g_object_ref (sent_folder);
                g_object_unref (folder);
                folder = sent_folder;

                g_clear_error (&local_error);
                camel_folder_append_message_sync (
                    folder, message, info,
                    NULL, cancellable, &local_error);
            }

            if (local_error != NULL) {
                if (g_error_matches (local_error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
                    goto exit;

                if (err->len)
                    g_string_append(err, "\n\n");
                g_string_append_printf (
                    err, _("Failed to append to local 'Sent' folder: %s"),
                    local_error->message);
            }
        }
    }

    if (local_error == NULL) {
        /* Mark the draft message for deletion, if present. */
        e_mail_session_handle_draft_headers_sync (
            session, message, cancellable, &local_error);
        if (local_error != NULL) {
            g_warning ("%s: Failed to handle draft headers: %s", G_STRFUNC, local_error->message);
            g_clear_error (&local_error);
        }

        /* Set flags on the original source message, if present.
         * Source message refers to the message being forwarded
         * or replied to. */
        e_mail_session_handle_source_headers_sync (
            session, message, cancellable, &local_error);
        if (local_error != NULL) {
            g_warning ("%s: Failed to handle source headers: %s", G_STRFUNC, local_error->message);
            g_clear_error (&local_error);
        }
    }

    if (local_error == NULL) {
        camel_folder_set_message_flags (
            queue, uid, CAMEL_MESSAGE_DELETED |
            CAMEL_MESSAGE_SEEN, ~0);
        /* Sync it to disk, since if it crashes in between,
         * we keep sending it again on next start. */
        /* FIXME Not passing a GCancellable or GError here. */
        camel_folder_synchronize_sync (queue, FALSE, NULL, NULL);
    }

    if (err->len) {
        /* set the culmulative exception report */
        g_set_error (
            &local_error, CAMEL_ERROR,
            CAMEL_ERROR_GENERIC, "%s", err->str);
    }

exit:
    if (local_error != NULL)
        g_propagate_error (error, local_error);

    /* FIXME Not passing a GCancellable or GError here. */
    if (folder) {
        camel_folder_synchronize_sync (folder, FALSE, NULL, NULL);
        g_object_unref (folder);
    }
    if (info)
        camel_message_info_free (info);
    g_object_unref (recipients);
    g_object_unref (from);
    g_free (sent_folder_uri);
    g_free (transport_uid);
    camel_header_raw_clear (&xev);
    g_string_free (err, TRUE);
    g_object_unref (message);
}

/* ** SEND MAIL QUEUE ***************************************************** */

static void
report_status (struct _send_queue_msg *m,
               enum camel_filter_status_t status,
               gint pc,
               const gchar *desc,
               ...)
{
    va_list ap;
    gchar *str;

    if (m->status) {
        va_start (ap, desc);
        str = g_strdup_vprintf (desc, ap);
        va_end (ap);
        m->status (m->driver, status, pc, str, m->status_data);
        g_free (str);
    }
}

static void
send_queue_exec (struct _send_queue_msg *m,
                 GCancellable *cancellable,
                 GError **error)
{
    EMailSession *session;
    CamelFolder *sent_folder;
    GPtrArray *uids, *send_uids = NULL;
    gint i, j;
    GError *local_error = NULL;

    d(printf("sending queue\n"));

    session = e_mail_backend_get_session (m->backend);

    sent_folder =
        e_mail_session_get_local_folder (
        session, E_MAIL_LOCAL_FOLDER_SENT);

    if (!(uids = camel_folder_get_uids (m->queue)))
        return;

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

        info = camel_folder_get_message_info (m->queue, uids->pdata[i]);
        if (info) {
            if ((camel_message_info_flags (info) & CAMEL_MESSAGE_DELETED) == 0)
                send_uids->pdata[j++] = uids->pdata[i];
            camel_folder_free_message_info (m->queue, info);
        }
    }

    send_uids->len = j;
    if (send_uids->len == 0) {
        /* nothing to send */
        camel_folder_free_uids (m->queue, uids);
        g_ptr_array_free (send_uids, TRUE);
        return;
    }

    camel_operation_push_message (cancellable, _("Sending message"));

    /* NB: This code somewhat abuses the 'exception' stuff.  Apart from
     *     fatal problems, it is also used as a mechanism to accumualte
     *     warning messages and present them back to the user. */

    for (i = 0, j = 0; i < send_uids->len; i++) {
        gint pc = (100 * i) / send_uids->len;

        report_status (
            m, CAMEL_FILTER_STATUS_START, pc,
            _("Sending message %d of %d"), i+1,
            send_uids->len);

        camel_operation_progress (
            cancellable, (i + 1) * 100 / send_uids->len);

        mail_send_message (
            m, m->queue, send_uids->pdata[i], m->transport,
            m->driver, cancellable, &local_error);
        if (local_error != NULL) {
            if (!g_error_matches (local_error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
                /* merge exceptions into one */
                if (m->base.error != NULL) {
                    gchar *old_message;

                    old_message = g_strdup (
                        m->base.error->message);
                    g_clear_error (&m->base.error);
                    g_set_error (
                        &m->base.error, CAMEL_ERROR,
                        CAMEL_ERROR_GENERIC,
                        "%s\n\n%s", old_message,
                        local_error->message);
                    g_free (old_message);

                    g_clear_error (&local_error);
                } else {
                    g_propagate_error (&m->base.error, local_error);
                    local_error = NULL;
                }

                /* keep track of the number of failures */
                j++;
            } else {
                /* transfer the USER_CANCEL error to the
                 * async op exception and then break */
                g_propagate_error (&m->base.error, local_error);
                local_error = NULL;
                break;
            }
        }
    }

    j += (send_uids->len - i);

    if (j > 0)
        report_status (
            m, CAMEL_FILTER_STATUS_END, 100,
            _("Failed to send %d of %d messages"),
            j, send_uids->len);
    else if (g_error_matches (
            m->base.error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
        report_status (m, CAMEL_FILTER_STATUS_END, 100, _("Canceled."));
    else
        report_status (m, CAMEL_FILTER_STATUS_END, 100, _("Complete."));

    if (m->driver) {
        g_object_unref (m->driver);
        m->driver = NULL;
    }

    camel_folder_free_uids (m->queue, uids);
    g_ptr_array_free (send_uids, TRUE);

    /* FIXME Not passing a GCancellable or GError here. */
    if (j <= 0 && m->base.error == NULL)
        camel_folder_synchronize_sync (m->queue, TRUE, NULL, NULL);

    /* FIXME Not passing a GCancellable or GError here. */
    if (sent_folder)
        camel_folder_synchronize_sync (sent_folder, FALSE, NULL, NULL);

    camel_operation_pop_message (cancellable);
}

static void
send_queue_done (struct _send_queue_msg *m)
{
    if (m->done)
        m->done (m->data);
}

static gchar *
send_queue_desc (struct _send_queue_msg *m)
{
    return g_strdup (_("Sending message"));
}

static void
send_queue_free (struct _send_queue_msg *m)
{
    if (m->backend != NULL)
        g_object_unref (m->backend);
    if (m->driver != NULL)
        g_object_unref (m->driver);
    if (m->transport != NULL)
        g_object_unref (m->transport);
    g_object_unref (m->queue);
}

static MailMsgInfo send_queue_info = {
    sizeof (struct _send_queue_msg),
    (MailMsgDescFunc) send_queue_desc,
    (MailMsgExecFunc) send_queue_exec,
    (MailMsgDoneFunc) send_queue_done,
    (MailMsgFreeFunc) send_queue_free
};

/* same interface as fetch_mail, just 'cause i'm lazy today
 * (and we need to run it from the same spot?) */
void
mail_send_queue (EMailBackend *backend,
                 CamelFolder *queue,
                 CamelTransport *transport,
                 const gchar *type,
                 GCancellable *cancellable,
                 CamelFilterGetFolderFunc get_folder,
                 gpointer get_data,
                 CamelFilterStatusFunc *status,
                 gpointer status_data,
                 void (*done)(gpointer data),
                 gpointer data)
{
    EMailSession *session;
    struct _send_queue_msg *m;

    g_return_if_fail (E_IS_MAIL_BACKEND (backend));

    session = e_mail_backend_get_session (backend);

    m = mail_msg_new (&send_queue_info);
    m->backend = g_object_ref (backend);
    m->queue = g_object_ref (queue);
    m->transport = g_object_ref (transport);
    if (G_IS_CANCELLABLE (cancellable))
        e_activity_set_cancellable (m->base.activity, cancellable);
    m->status = status;
    m->status_data = status_data;
    m->done = done;
    m->data = data;

    m->driver = camel_session_get_filter_driver (
        CAMEL_SESSION (session), type, NULL);
    camel_filter_driver_set_folder_func (m->driver, get_folder, get_data);

    mail_msg_unordered_push (m);
}

/* ** TRANSFER MESSAGES **************************************************** */

struct _transfer_msg {
    MailMsg base;

    EMailSession *session;
    CamelFolder *source;
    GPtrArray *uids;
    gboolean delete;
    gchar *dest_uri;
    guint32 dest_flags;

    void (*done)(gboolean ok, gpointer data);
    gpointer data;
};

static gchar *
transfer_messages_desc (struct _transfer_msg *m)
{
    return g_strdup_printf (
        m->delete ?
            _("Moving messages to '%s'") :
            _("Copying messages to '%s'"),
        m->dest_uri);

}

static void
transfer_messages_exec (struct _transfer_msg *m,
                        GCancellable *cancellable,
                        GError **error)
{
    CamelFolder *dest;

    dest = e_mail_session_uri_to_folder_sync (
        m->session, m->dest_uri, m->dest_flags,
        cancellable, error);
    if (dest == NULL)
        return;

    if (dest == m->source) {
        g_object_unref (dest);
        /* no-op */
        return;
    }

    camel_folder_freeze (m->source);
    camel_folder_freeze (dest);

    camel_folder_transfer_messages_to_sync (
        m->source, m->uids, dest, m->delete, NULL,
        cancellable, error);

    /* make sure all deleted messages are marked as seen */

    if (m->delete) {
        gint i;

        for (i = 0; i < m->uids->len; i++)
            camel_folder_set_message_flags (
                m->source, m->uids->pdata[i],
                CAMEL_MESSAGE_SEEN, CAMEL_MESSAGE_SEEN);
    }

    camel_folder_thaw (m->source);
    camel_folder_thaw (dest);

    /* FIXME Not passing a GCancellable or GError here. */
    camel_folder_synchronize_sync (dest, FALSE, NULL, NULL);
    g_object_unref (dest);
}

static void
transfer_messages_done (struct _transfer_msg *m)
{
    if (m->done)
        m->done (m->base.error == NULL, m->data);
}

static void
transfer_messages_free (struct _transfer_msg *m)
{
    g_object_unref (m->session);
    g_object_unref (m->source);
    g_free (m->dest_uri);
    em_utils_uids_free (m->uids);
}

static MailMsgInfo transfer_messages_info = {
    sizeof (struct _transfer_msg),
    (MailMsgDescFunc) transfer_messages_desc,
    (MailMsgExecFunc) transfer_messages_exec,
    (MailMsgDoneFunc) transfer_messages_done,
    (MailMsgFreeFunc) transfer_messages_free
};

void
mail_transfer_messages (EMailSession *session,
                        CamelFolder *source,
                        GPtrArray *uids,
                        gboolean delete_from_source,
                        const gchar *dest_uri,
                        guint32 dest_flags,
                        void (*done) (gboolean ok,
                                      gpointer data),
                        gpointer data)
{
    struct _transfer_msg *m;

    g_return_if_fail (CAMEL_IS_FOLDER (source));
    g_return_if_fail (uids != NULL);
    g_return_if_fail (dest_uri != NULL);

    m = mail_msg_new (&transfer_messages_info);
    m->session = g_object_ref (session);
    m->source = g_object_ref (source);
    m->uids = uids;
    m->delete = delete_from_source;
    m->dest_uri = g_strdup (dest_uri);
    m->dest_flags = dest_flags;
    m->done = done;
    m->data = data;

    mail_msg_slow_ordered_push (m);
}

/* ** SYNC FOLDER ********************************************************* */

struct _sync_folder_msg {
    MailMsg base;

    EMailBackend *backend;
    CamelFolder *folder;
    void (*done) (CamelFolder *folder, gpointer data);
    gpointer data;
};

static gchar *
sync_folder_desc (struct _sync_folder_msg *m)
{
    return g_strdup_printf (_("Storing folder '%s'"),
                   camel_folder_get_full_name (m->folder));
}

static void
sync_folder_exec (struct _sync_folder_msg *m,
                  GCancellable *cancellable,
                  GError **error)
{
    camel_folder_synchronize_sync (
        m->folder, FALSE, cancellable, error);
}

static void
sync_folder_done (struct _sync_folder_msg *m)
{
    if (m->done)
        m->done (m->folder, m->data);
}

static void
sync_folder_free (struct _sync_folder_msg *m)
{
    if (m->backend)
        g_object_unref (m->backend);

    if (m->folder)
        g_object_unref (m->folder);
}

static MailMsgInfo sync_folder_info = {
    sizeof (struct _sync_folder_msg),
    (MailMsgDescFunc) sync_folder_desc,
    (MailMsgExecFunc) sync_folder_exec,
    (MailMsgDoneFunc) sync_folder_done,
    (MailMsgFreeFunc) sync_folder_free
};

void
mail_sync_folder (CamelFolder *folder,
                  void (*done) (CamelFolder *folder,
                                gpointer data),
                  gpointer data)
{
    struct _sync_folder_msg *m;

    m = mail_msg_new (&sync_folder_info);
    m->folder = g_object_ref (folder);
    m->data = data;
    m->done = done;

    mail_msg_slow_ordered_push (m);
}

/* ** SYNC STORE ********************************************************* */

struct _sync_store_msg {
    MailMsg base;

    CamelStore *store;
    gint expunge;
    void (*done) (CamelStore *store, gpointer data);
    gpointer data;
};

static gchar *
sync_store_desc (struct _sync_store_msg *m)
{
    CamelURL *url;
    gchar *uri, *res;

    url = camel_service_new_camel_url (CAMEL_SERVICE (m->store));
    uri = camel_url_to_string (url, CAMEL_URL_HIDE_ALL);
    camel_url_free (url);

    res = g_strdup_printf (m->expunge
                  ?_("Expunging and storing account '%s'")
                  :_("Storing account '%s'"),
                  uri);
    g_free (uri);

    return res;
}

static void
sync_store_exec (struct _sync_store_msg *m,
                 GCancellable *cancellable,
                 GError **error)
{
    camel_store_synchronize_sync (
        m->store, m->expunge,
        cancellable, error);
}

static void
sync_store_done (struct _sync_store_msg *m)
{
    if (m->done)
        m->done (m->store, m->data);
}

static void
sync_store_free (struct _sync_store_msg *m)
{
    g_object_unref (m->store);
}

static MailMsgInfo sync_store_info = {
    sizeof (struct _sync_store_msg),
    (MailMsgDescFunc) sync_store_desc,
    (MailMsgExecFunc) sync_store_exec,
    (MailMsgDoneFunc) sync_store_done,
    (MailMsgFreeFunc) sync_store_free
};

void
mail_sync_store (CamelStore *store,
                 gint expunge,
                 void (*done) (CamelStore *store,
                               gpointer data),
                 gpointer data)
{
    struct _sync_store_msg *m;

    m = mail_msg_new (&sync_store_info);
    m->store = g_object_ref (store);
    m->expunge = expunge;
    m->data = data;
    m->done = done;

    mail_msg_slow_ordered_push (m);
}

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

static gchar *
refresh_folder_desc (struct _sync_folder_msg *m)
{
    return g_strdup_printf (
        _("Refreshing folder '%s'"),
        camel_folder_get_full_name (m->folder));
}

static void
refresh_folder_exec (struct _sync_folder_msg *m,
                     GCancellable *cancellable,
                     GError **error)
{
    camel_folder_refresh_info_sync (
        m->folder, cancellable, error);
}

/* we just use the sync stuff where we can, since it would be the same */
static MailMsgInfo refresh_folder_info = {
    sizeof (struct _sync_folder_msg),
    (MailMsgDescFunc) refresh_folder_desc,
    (MailMsgExecFunc) refresh_folder_exec,
    (MailMsgDoneFunc) sync_folder_done,
    (MailMsgFreeFunc) sync_folder_free
};

void
mail_refresh_folder (CamelFolder *folder,
                     void (*done) (CamelFolder *folder,
                                   gpointer data),
                     gpointer data)
{
    struct _sync_folder_msg *m;

    m = mail_msg_new (&refresh_folder_info);
    m->folder = g_object_ref (folder);
    m->data = data;
    m->done = done;

    mail_msg_slow_ordered_push (m);
}

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

static gboolean
folder_is_from_source_uid (CamelFolder *folder,
                           const gchar *source_uid)
{
    CamelStore *store;
    const gchar *uid;

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

    return (g_strcmp0 (uid, source_uid) == 0);
}

/* This is because pop3 accounts are hidden under local Inbox,
 * thus whenever an expunge is done on a local trash or Inbox,
 * then also all active pop3 accounts should be expunged. */
static gboolean
expunge_pop3_stores (CamelFolder *expunging,
                     EMailBackend *backend,
                     GCancellable *cancellable,
                     GError **error)
{
    GHashTable *expunging_uids;
    EMailSession *session;
    GPtrArray *uids;
    EAccount *account;
    EIterator *iter;
    gboolean success = TRUE;
    guint ii;

    session = e_mail_backend_get_session (backend);

    uids = camel_folder_get_uids (expunging);

    if (uids == NULL)
        return TRUE;

    expunging_uids = g_hash_table_new_full (
        (GHashFunc) g_str_hash,
        (GEqualFunc) g_str_equal,
        (GDestroyNotify) g_free,
        (GDestroyNotify) g_free);

    for (ii = 0; ii < uids->len; ii++) {
        CamelMessageInfo *info;
        CamelMessageFlags flags = 0;
        CamelMimeMessage *message;
        const gchar *pop3_uid;
        const gchar *source_uid;

        info = camel_folder_get_message_info (
            expunging, uids->pdata[ii]);

        if (info != NULL) {
            flags = camel_message_info_flags (info);
            camel_folder_free_message_info (expunging, info);
        }

        /* Only interested in deleted messages. */
        if ((flags & CAMEL_MESSAGE_DELETED) == 0)
            continue;

        /* because the UID in the local store doesn't
         * match with the UID in the pop3 store */
        message = camel_folder_get_message_sync (
            expunging, uids->pdata[ii], cancellable, NULL);

        if (message == NULL)
            continue;

        pop3_uid = camel_medium_get_header (
            CAMEL_MEDIUM (message), "X-Evolution-POP3-UID");
        source_uid = camel_mime_message_get_source (message);

        if (pop3_uid != NULL)
            g_hash_table_insert (
                expunging_uids,
                g_strstrip (g_strdup (pop3_uid)),
                g_strstrip (g_strdup (source_uid)));

        g_object_unref (message);
    }

    camel_folder_free_uids (expunging, uids);
    uids = NULL;

    if (g_hash_table_size (expunging_uids) == 0) {
        g_hash_table_destroy (expunging_uids);
        return TRUE;
    }

    for (iter = e_list_get_iterator ((EList *) e_get_account_list ());
         e_iterator_is_valid (iter); e_iterator_next (iter)) {
        account = (EAccount *) e_iterator_get (iter);

        if (account->enabled &&
            account->source && account->source->url &&
            g_str_has_prefix (account->source->url, "pop://")) {
            CamelFolder *folder;
            CamelService *service;
            CamelSettings *settings;
            gboolean any_found = FALSE, delete_expunged = FALSE, keep_on_server = FALSE;

            service = camel_session_get_service (CAMEL_SESSION (session), account->uid);
            if (!CAMEL_IS_STORE (service))
                continue;

            settings = camel_service_get_settings (service);
            if (!settings)
                continue;

            g_object_get (
                settings,
                "delete-expunged", &delete_expunged,
                "keep-on-server", &keep_on_server,
                NULL);

            if (!keep_on_server || !delete_expunged)
                continue;

            folder = e_mail_session_get_inbox_sync (
                session, account->uid, cancellable, error);

            /* Abort the loop on error. */
            if (folder == NULL) {
                success = FALSE;
                break;
            }

            uids = camel_folder_get_uids (folder);
            if (uids) {
                for (ii = 0; ii < uids->len; ii++) {
                    /* ensure the ID is from this account,
                     * as it's generated by evolution */
                    const gchar *source_uid;

                    source_uid = g_hash_table_lookup (
                        expunging_uids, uids->pdata[ii]);
                    if (folder_is_from_source_uid (folder, source_uid)) {
                        any_found = TRUE;
                        camel_folder_delete_message (folder, uids->pdata[ii]);
                    }
                }
                camel_folder_free_uids (folder, uids);
            }

            if (any_found)
                success = camel_folder_synchronize_sync (folder, TRUE, cancellable, error);

            g_object_unref (folder);

            /* Abort the loop on error. */
            if (!success)
                break;
        }
    }

    if (iter)
        g_object_unref (iter);

    g_hash_table_destroy (expunging_uids);

    return success;
}

static gchar *
expunge_folder_desc (struct _sync_folder_msg *m)
{
    return g_strdup_printf (
        _("Expunging folder '%s'"),
        camel_folder_get_full_name (m->folder));
}

static void
expunge_folder_exec (struct _sync_folder_msg *m,
                     GCancellable *cancellable,
                     GError **error)
{
    EMailSession *session;
    CamelFolder *local_inbox;
    CamelStore *parent_store;
    gboolean is_local_inbox_or_trash;
    gboolean store_is_local;
    gboolean success = TRUE;
    const gchar *uid;

    session = e_mail_backend_get_session (m->backend);
    parent_store = camel_folder_get_parent_store (m->folder);
    uid = camel_service_get_uid (CAMEL_SERVICE (parent_store));
    store_is_local = (g_strcmp0 (uid, E_MAIL_SESSION_LOCAL_UID) == 0);

    local_inbox =
        e_mail_session_get_local_folder (
        session, E_MAIL_LOCAL_FOLDER_INBOX);
    is_local_inbox_or_trash = (m->folder == local_inbox);

    if (store_is_local && !is_local_inbox_or_trash) {
        CamelFolder *trash;

        trash = camel_store_get_trash_folder_sync (
            parent_store, cancellable, error);

        if (trash == NULL)
            return;

        is_local_inbox_or_trash = (m->folder == trash);

        g_object_unref (trash);
    }

    /* do this before expunge, to know which messages will be expunged */
    if (is_local_inbox_or_trash)
        success = expunge_pop3_stores (
            m->folder, m->backend, cancellable, error);

    if (success)
        camel_folder_expunge_sync (m->folder, cancellable, error);
}

/* we just use the sync stuff where we can, since it would be the same */
static MailMsgInfo expunge_folder_info = {
    sizeof (struct _sync_folder_msg),
    (MailMsgDescFunc) expunge_folder_desc,
    (MailMsgExecFunc) expunge_folder_exec,
    (MailMsgDoneFunc) sync_folder_done,
    (MailMsgFreeFunc) sync_folder_free
};

void
mail_expunge_folder (EMailBackend *backend,
                     CamelFolder *folder)
{
    struct _sync_folder_msg *m;

    m = mail_msg_new (&expunge_folder_info);
    m->backend = g_object_ref (backend);
    m->folder = g_object_ref (folder);

    mail_msg_slow_ordered_push (m);
}

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

struct _empty_trash_msg {
    MailMsg base;

    EMailBackend *backend;
    CamelStore *store;
};

static gchar *
empty_trash_desc (struct _empty_trash_msg *m)
{
    CamelService *service;
    const gchar *display_name;

    service = CAMEL_SERVICE (m->store);
    display_name = camel_service_get_display_name (service);

    return g_strdup_printf (
        _("Emptying trash in '%s'"), display_name);
}

static void
empty_trash_exec (struct _empty_trash_msg *m,
                  GCancellable *cancellable,
                  GError **error)
{
    CamelService *service;
    CamelFolder *trash;
    const gchar *uid;
    gboolean success = TRUE;

    service = CAMEL_SERVICE (m->store);
    uid = camel_service_get_uid (service);

    if (!em_utils_connect_service_sync (service, cancellable, error))
        return;

    trash = camel_store_get_trash_folder_sync (
        m->store, cancellable, error);

    if (trash == NULL)
        return;

    /* do this before expunge, to know which messages will be expunged */
    if (g_strcmp0 (uid, E_MAIL_SESSION_LOCAL_UID) == 0)
        success = expunge_pop3_stores (
            trash, m->backend, cancellable, error);

    if (success)
        camel_folder_expunge_sync (trash, cancellable, error);

    g_object_unref (trash);
}

static void
empty_trash_done (struct _empty_trash_msg *m)
{
}

static void
empty_trash_free (struct _empty_trash_msg *m)
{
    if (m->backend)
        g_object_unref (m->backend);
    if (m->store)
        g_object_unref (m->store);
}

static MailMsgInfo empty_trash_info = {
    sizeof (struct _empty_trash_msg),
    (MailMsgDescFunc) empty_trash_desc,
    (MailMsgExecFunc) empty_trash_exec,
    (MailMsgDoneFunc) empty_trash_done,
    (MailMsgFreeFunc) empty_trash_free
};

void
mail_empty_trash (EMailBackend *backend,
                  CamelStore *store)
{
    struct _empty_trash_msg *m;

    g_return_if_fail (E_IS_MAIL_BACKEND (backend));
    g_return_if_fail (CAMEL_IS_STORE (store));

    m = mail_msg_new (&empty_trash_info);
    m->backend = g_object_ref (backend);
    m->store = g_object_ref (store);

    mail_msg_slow_ordered_push (m);
}

/* ** Execute Shell Command ************************************************ */

void
mail_execute_shell_command (CamelFilterDriver *driver,
                            gint argc,
                            gchar **argv,
                            gpointer data)
{
    if (argc <= 0)
        return;

    g_spawn_async (NULL, argv, NULL, 0, NULL, data, NULL, NULL);
}

/* ------------------------------------------------------------------------- */

struct _disconnect_msg {
    MailMsg base;

    CamelStore *store;
};

static gchar *
disconnect_service_desc (struct _disconnect_msg *m)
{
    gchar *name, *res;

    name = camel_service_get_name (CAMEL_SERVICE (m->store), TRUE);
    res = g_strdup_printf (_("Disconnecting %s"), name ? name : "");
    g_free (name);

    return res;
}

static void
disconnect_service_exec (struct _disconnect_msg *m,
                    GCancellable *cancellable,
                    GError **error)
{
    em_utils_disconnect_service_sync (
        CAMEL_SERVICE (m->store), TRUE, cancellable, error);
}

static void
disconnect_service_free (struct _disconnect_msg *m)
{
    g_object_unref (m->store);
}

static MailMsgInfo disconnect_service_info = {
    sizeof (struct _disconnect_msg),
    (MailMsgDescFunc) disconnect_service_desc,
    (MailMsgExecFunc) disconnect_service_exec,
    (MailMsgDoneFunc) NULL,
    (MailMsgFreeFunc) disconnect_service_free
};

gint
mail_disconnect_store (CamelStore *store)
{
    struct _disconnect_msg *m;
    gint id;

    g_return_val_if_fail (store != NULL, -1);

    m = mail_msg_new (&disconnect_service_info);
    m->store = g_object_ref (store);

    id = m->base.seq;
    mail_msg_unordered_push (m);

    return id;
}