path: root/libemail-engine/e-mail-session.c

/*
 * e-mail-session.c
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 *
 * Authors:
 *   Jonathon Jongsma <jonathon.jongsma@collabora.co.uk>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 * Copyright (C) 2009 Intel Corporation
 *
 */

/* mail-session.c: handles the session information and resource manipulation */

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

#include <errno.h>
#include <stdlib.h>
#include <string.h>

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

#include <gtk/gtk.h>

#ifdef HAVE_CANBERRA
#include <canberra-gtk.h>
#endif

#include <libebackend/libebackend.h>

#include "libemail-engine/mail-mt.h"

/* This is our hack, not part of libcamel. */
#include "camel-null-store.h"

/* This too, though it's less of a hack. */
#include "camel-sasl-xoauth2.h"

#include "e-mail-authenticator.h"
#include "e-mail-session.h"
#include "e-mail-folder-utils.h"
#include "e-mail-utils.h"
#include "mail-config.h"
#include "mail-ops.h"
#include "mail-tools.h"

#define E_MAIL_SESSION_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_MAIL_SESSION, EMailSessionPrivate))

typedef struct _AsyncContext AsyncContext;
typedef struct _ServiceProxyData ServiceProxyData;

struct _EMailSessionPrivate {
    MailFolderCache *folder_cache;
    ESourceRegistry *registry;

    /* ESource UID -> Timeout ID */
    GHashTable *auto_refresh_table;

    gulong source_added_handler_id;
    gulong source_removed_handler_id;
    gulong source_enabled_handler_id;
    gulong source_disabled_handler_id;
    gulong default_mail_account_handler_id;

    CamelService *local_store;
    CamelService *vfolder_store;

    FILE *filter_logfile;
    GHashTable *junk_filters;

    /* Local folder cache. */
    GPtrArray *local_folders;
    GPtrArray *local_folder_uris;

    guint preparing_flush;
    GMutex preparing_flush_lock;
};

struct _AsyncContext {
    /* arguments */
    CamelStoreGetFolderFlags flags;
    gchar *uid;
    gchar *uri;

    /* results */
    CamelFolder *folder;
};

struct _ServiceProxyData {
    ESource *authentication_source;
    gulong auth_source_changed_handler_id;
};

enum {
    PROP_0,
    PROP_FOLDER_CACHE,
    PROP_LOCAL_STORE,
    PROP_REGISTRY,
    PROP_VFOLDER_STORE
};

static const gchar *local_folder_names[E_MAIL_NUM_LOCAL_FOLDERS] = {
    N_("Inbox"),        /* E_MAIL_LOCAL_FOLDER_INBOX */
    N_("Drafts"),       /* E_MAIL_LOCAL_FOLDER_DRAFTS */
    N_("Outbox"),       /* E_MAIL_LOCAL_FOLDER_OUTBOX */
    N_("Sent"),     /* E_MAIL_LOCAL_FOLDER_SENT */
    N_("Templates"),    /* E_MAIL_LOCAL_FOLDER_TEMPLATES */
    "Inbox"         /* E_MAIL_LOCAL_FOLDER_LOCAL_INBOX */
};

enum {
    FLUSH_OUTBOX,
    REFRESH_SERVICE,
    STORE_ADDED,
    STORE_REMOVED,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL];

static gchar *mail_data_dir;
static gchar *mail_cache_dir;
static gchar *mail_config_dir;

G_DEFINE_TYPE_WITH_CODE (
    EMailSession,
    e_mail_session,
    CAMEL_TYPE_SESSION,
    G_IMPLEMENT_INTERFACE (E_TYPE_EXTENSIBLE, NULL))

static gboolean
session_forward_to_flush_outbox_cb (gpointer user_data)
{
    EMailSession *session = E_MAIL_SESSION (user_data);

    g_mutex_lock (&session->priv->preparing_flush_lock);
    session->priv->preparing_flush = 0;
    g_mutex_unlock (&session->priv->preparing_flush_lock);

    /* Connect to this and call mail_send in the main email client.*/
    g_signal_emit (session, signals[FLUSH_OUTBOX], 0);

    return FALSE;
}

static void
async_context_free (AsyncContext *context)
{
    if (context->folder != NULL)
        g_object_unref (context->folder);

    g_free (context->uid);
    g_free (context->uri);

    g_slice_free (AsyncContext, context);
}

static void
service_proxy_data_free (ServiceProxyData *proxy_data)
{
    g_signal_handler_disconnect (
        proxy_data->authentication_source,
        proxy_data->auth_source_changed_handler_id);

    g_clear_object (&proxy_data->authentication_source);

    g_slice_free (ServiceProxyData, proxy_data);
}

static void
mail_session_update_proxy_resolver (CamelService *service,
                                    ESource *authentication_source)
{
    GProxyResolver *proxy_resolver = NULL;
    ESourceAuthentication *extension;
    CamelSession *session;
    ESource *source = NULL;
    gchar *uid;

    session = camel_service_ref_session (service);

    extension = e_source_get_extension (
        authentication_source,
        E_SOURCE_EXTENSION_AUTHENTICATION);

    uid = e_source_authentication_dup_proxy_uid (extension);
    if (uid != NULL) {
        ESourceRegistry *registry;
        EMailSession *mail_session;

        mail_session = E_MAIL_SESSION (session);
        registry = e_mail_session_get_registry (mail_session);
        source = e_source_registry_ref_source (registry, uid);
        g_free (uid);
    }

    if (source != NULL) {
        proxy_resolver = G_PROXY_RESOLVER (source);
        if (!g_proxy_resolver_is_supported (proxy_resolver))
            proxy_resolver = NULL;
    }

    camel_service_set_proxy_resolver (service, proxy_resolver);

    g_clear_object (&session);
    g_clear_object (&source);
}

static void
mail_session_auth_source_changed_cb (ESource *authentication_source,
                                     GWeakRef *service_weak_ref)
{
    CamelService *service;

    service = g_weak_ref_get (service_weak_ref);

    if (service != NULL) {
        mail_session_update_proxy_resolver (
            service, authentication_source);
        g_object_unref (service);
    }
}

static void
mail_session_configure_proxy_resolver (ESourceRegistry *registry,
                                       CamelService *service)
{
    ESource *source;
    ESource *authentication_source;
    const gchar *uid;

    uid = camel_service_get_uid (service);
    source = e_source_registry_ref_source (registry, uid);
    g_return_if_fail (source != NULL);

    authentication_source =
        e_source_registry_find_extension (
        registry, source, E_SOURCE_EXTENSION_AUTHENTICATION);

    if (authentication_source != NULL) {
        ServiceProxyData *proxy_data;
        gulong handler_id;

        mail_session_update_proxy_resolver (
            service, authentication_source);

        handler_id = g_signal_connect_data (
            authentication_source, "changed",
            G_CALLBACK (mail_session_auth_source_changed_cb),
            e_weak_ref_new (service),
            (GClosureNotify) e_weak_ref_free, 0);

        /* This takes ownership of the authentication source. */
        proxy_data = g_slice_new0 (ServiceProxyData);
        proxy_data->authentication_source = authentication_source;
        proxy_data->auth_source_changed_handler_id = handler_id;

        /* Tack the proxy data on to the CamelService,
         * so it's destroyed along with the CamelService. */
        g_object_set_data_full (
            G_OBJECT (service),
            "proxy-data", proxy_data,
            (GDestroyNotify) service_proxy_data_free);
    }

    g_object_unref (source);
}

static gchar *
mail_session_resolve_popb4smtp (ESourceRegistry *registry,
                                CamelService *smtp_service)
{
    GList *list, *link;
    const gchar *extension_name;
    const gchar *smtp_uid;
    gchar *pop_uid = NULL;

    /* Find a POP account that uses the given smtp_service as its
     * transport.  XXX This isn't foolproof though, since we don't
     * check that the POP server is at the same domain as the SMTP
     * server, which is kind of the point of POPB4SMTP. */

    smtp_uid = camel_service_get_uid (smtp_service);
    g_return_val_if_fail (smtp_uid != NULL, NULL);

    extension_name = E_SOURCE_EXTENSION_MAIL_ACCOUNT;
    list = e_source_registry_list_sources (registry, extension_name);

    for (link = list; link != NULL; link = g_list_next (link)) {
        ESource *source = E_SOURCE (link->data);
        ESourceExtension *extension;
        const gchar *backend_name;
        gchar *uid;

        extension_name = E_SOURCE_EXTENSION_MAIL_ACCOUNT;
        extension = e_source_get_extension (source, extension_name);

        /* We're only interested in POP accounts. */

        backend_name = e_source_backend_get_backend_name (
            E_SOURCE_BACKEND (extension));
        if (g_strcmp0 (backend_name, "pop") != 0)
            continue;

        /* Get the mail account's default mail identity. */

        uid = e_source_mail_account_dup_identity_uid (
            E_SOURCE_MAIL_ACCOUNT (extension));
        source = e_source_registry_ref_source (registry, uid);
        g_free (uid);

        if (source == NULL)
            continue;

        /* Get the mail identity's default mail transport. */

        extension_name = E_SOURCE_EXTENSION_MAIL_SUBMISSION;
        extension = e_source_get_extension (source, extension_name);

        uid = e_source_mail_submission_dup_transport_uid (
            E_SOURCE_MAIL_SUBMISSION (extension));

        g_object_unref (source);

        if (g_strcmp0 (uid, smtp_uid) == 0) {
            pop_uid = uid;
            break;
        }

        g_free (uid);
    }

    g_list_free_full (list, (GDestroyNotify) g_object_unref);

    return pop_uid;
}

static void
mail_session_refresh_cb (ESource *source,
                         EMailSession *session)
{
    ESourceRegistry *registry;
    CamelService *service;
    const gchar *uid;

    registry = e_mail_session_get_registry (session);

    /* Skip the signal emission if the source
     * or any of its ancestors are disabled. */
    if (!e_source_registry_check_enabled (registry, source))
        return;

    uid = e_source_get_uid (source);
    service = camel_session_ref_service (CAMEL_SESSION (session), uid);
    g_return_if_fail (service != NULL);

    g_signal_emit (session, signals[REFRESH_SERVICE], 0, service);

    g_object_unref (service);
}

static gboolean
mail_session_check_goa_mail_disabled (EMailSession *session,
                                      ESource *source)
{
    ESource *goa_source;
    ESourceRegistry *registry;
    gboolean goa_mail_disabled = FALSE;

    registry = e_mail_session_get_registry (session);

    goa_source = e_source_registry_find_extension (
        registry, source, E_SOURCE_EXTENSION_GOA);

    if (goa_source != NULL) {
        goa_mail_disabled = !e_source_get_enabled (source);
        g_object_unref (goa_source);
    }

    return goa_mail_disabled;
}

static gboolean
mail_session_check_uoa_mail_disabled (EMailSession *session,
                                      ESource *source)
{
    ESource *uoa_source;
    ESourceRegistry *registry;
    gboolean uoa_mail_disabled = FALSE;

    registry = e_mail_session_get_registry (session);

    uoa_source = e_source_registry_find_extension (
        registry, source, E_SOURCE_EXTENSION_UOA);

    if (uoa_source != NULL) {
        uoa_mail_disabled = !e_source_get_enabled (source);
        g_object_unref (uoa_source);
    }

    return uoa_mail_disabled;
}

static void
mail_session_add_from_source (EMailSession *session,
                              CamelProviderType type,
                              ESource *source)
{
    ESourceBackend *extension;
    CamelService *service;
    const gchar *uid;
    const gchar *backend_name;
    const gchar *display_name;
    const gchar *extension_name;
    GError *error = NULL;

    switch (type) {
        case CAMEL_PROVIDER_STORE:
            extension_name = E_SOURCE_EXTENSION_MAIL_ACCOUNT;
            break;
        case CAMEL_PROVIDER_TRANSPORT:
            extension_name = E_SOURCE_EXTENSION_MAIL_TRANSPORT;
            break;
        default:
            g_return_if_reached ();
    }

    uid = e_source_get_uid (source);
    display_name = e_source_get_display_name (source);

    extension = e_source_get_extension (source, extension_name);
    backend_name = e_source_backend_get_backend_name (extension);

    /* Sanity checks. */
    g_return_if_fail (uid != NULL);
    g_return_if_fail (backend_name != NULL);

    /* Collection sources with a [GNOME Online Accounts] extension
     * require special handling.  If the collection's mail-enabled
     * flag is FALSE, do not add a CamelService.  The account must
     * not appear anywhere, not even in the Mail Accounts list. */
    if (mail_session_check_goa_mail_disabled (session, source))
        return;

    /* Same deal for the [Ubuntu Online Accounts] extension. */
    if (mail_session_check_uoa_mail_disabled (session, source))
        return;

    service = camel_session_add_service (
        CAMEL_SESSION (session), uid,
        backend_name, type, &error);

    /* Our own CamelSession.add_service() method will handle the
     * new CamelService, so we only need to unreference it here. */
    if (service != NULL)
        g_object_unref (service);

    if (error != NULL) {
        g_warning (
            "Failed to add service '%s' (%s): %s",
            display_name, uid, error->message);
        g_error_free (error);
    }

    /* Set up auto-refresh. */
    extension_name = E_SOURCE_EXTENSION_REFRESH;
    if (e_source_has_extension (source, extension_name)) {
        guint timeout_id;

        /* Transports should not have a refresh extension. */
        g_warn_if_fail (type != CAMEL_PROVIDER_TRANSPORT);

        timeout_id = e_source_refresh_add_timeout (
            source, NULL, (ESourceRefreshFunc)
            mail_session_refresh_cb, session,
            (GDestroyNotify) NULL);

        g_hash_table_insert (
            session->priv->auto_refresh_table,
            g_strdup (uid),
            GUINT_TO_POINTER (timeout_id));
    }
}

static void
mail_session_source_added_cb (ESourceRegistry *registry,
                              ESource *source,
                              EMailSession *session)
{
    CamelProviderType provider_type;
    const gchar *extension_name;

    provider_type = CAMEL_PROVIDER_STORE;
    extension_name = E_SOURCE_EXTENSION_MAIL_ACCOUNT;

    if (e_source_has_extension (source, extension_name))
        mail_session_add_from_source (session, provider_type, source);

    provider_type = CAMEL_PROVIDER_TRANSPORT;
    extension_name = E_SOURCE_EXTENSION_MAIL_TRANSPORT;

    if (e_source_has_extension (source, extension_name))
        mail_session_add_from_source (session, provider_type, source);
}

static void
mail_session_source_removed_cb (ESourceRegistry *registry,
                                ESource *source,
                                EMailSession *session)
{
    CamelSession *camel_session;
    CamelService *service;
    const gchar *uid;

    camel_session = CAMEL_SESSION (session);

    uid = e_source_get_uid (source);
    service = camel_session_ref_service (camel_session, uid);

    if (service != NULL) {
        camel_session_remove_service (camel_session, service);
        g_object_unref (service);
    }
}

static void
mail_session_source_enabled_cb (ESourceRegistry *registry,
                                ESource *source,
                                EMailSession *session)
{
    ESource *goa_source;
    ESource *uoa_source;

    /* If the source is linked to a GNOME Online Account
     * or Ubuntu Online Account, enabling the source is
     * equivalent to adding it. */

    goa_source = e_source_registry_find_extension (
        registry, source, E_SOURCE_EXTENSION_GOA);

    uoa_source = e_source_registry_find_extension (
        registry, source, E_SOURCE_EXTENSION_UOA);

    if (goa_source != NULL || uoa_source != NULL)
        mail_session_source_added_cb (registry, source, session);

    if (goa_source != NULL)
        g_object_unref (goa_source);

    if (uoa_source != NULL)
        g_object_unref (uoa_source);
}

static void
mail_session_source_disabled_cb (ESourceRegistry *registry,
                                 ESource *source,
                                 EMailSession *session)
{
    ESource *goa_source;
    ESource *uoa_source;

    /* If the source is linked to a GNOME Online Account
     * or Ubuntu Online Account, disabling the source is
     * equivalent to removing it. */

    goa_source = e_source_registry_find_extension (
        registry, source, E_SOURCE_EXTENSION_GOA);

    uoa_source = e_source_registry_find_extension (
        registry, source, E_SOURCE_EXTENSION_UOA);

    if (goa_source != NULL || uoa_source != NULL)
        mail_session_source_removed_cb (registry, source, session);

    if (goa_source != NULL)
        g_object_unref (goa_source);

    if (uoa_source != NULL)
        g_object_unref (uoa_source);
}

static void
mail_session_default_mail_account_cb (ESourceRegistry *registry,
                                      GParamSpec *pspec,
                                      EMailSession *session)
{
    ESource *source;
    ESourceMailAccount *extension;
    const gchar *extension_name;
    gchar *uid;

    /* If the default mail account names a valid mail
     * identity, make it the default mail identity. */

    /* XXX I debated whether to have ESourceRegistry do this
     *     itself but it seems like an Evolution policy to me
     *     right now.  I may change my mind in the future, or
     *     decide not to do this synchronization at all. */

    source = e_source_registry_ref_default_mail_account (registry);
    g_return_if_fail (source != NULL);

    extension_name = E_SOURCE_EXTENSION_MAIL_ACCOUNT;
    extension = e_source_get_extension (source, extension_name);
    uid = e_source_mail_account_dup_identity_uid (extension);

    g_object_unref (source);
    source = NULL;

    if (uid != NULL) {
        source = e_source_registry_ref_source (registry, uid);
        g_free (uid);
    }

    if (source != NULL) {
        e_source_registry_set_default_mail_identity (registry, source);
        g_object_unref (source);
    }
}

static void
mail_session_configure_local_store (EMailSession *session)
{
    CamelLocalSettings *local_settings;
    CamelSession *camel_session;
    CamelSettings *settings;
    CamelService *service;
    const gchar *data_dir;
    const gchar *uid;
    gchar *path;
    gint ii;

    camel_session = CAMEL_SESSION (session);

    uid = E_MAIL_SESSION_LOCAL_UID;
    service = camel_session_ref_service (camel_session, uid);
    session->priv->local_store = service;  /* takes ownership */
    g_return_if_fail (service != NULL);

    settings = camel_service_ref_settings (service);

    data_dir = camel_session_get_user_data_dir (camel_session);
    path = g_build_filename (data_dir, E_MAIL_SESSION_LOCAL_UID, NULL);

    local_settings = CAMEL_LOCAL_SETTINGS (settings);
    camel_local_settings_set_path (local_settings, path);

    g_free (path);

    g_object_unref (settings);

    /* Shouldn't need to worry about other mail applications
     * altering files in our local mail store. */
    g_object_set (service, "need-summary-check", FALSE, NULL);

    /* Populate the local folder cache. */
    for (ii = 0; ii < E_MAIL_NUM_LOCAL_FOLDERS; ii++) {
        CamelFolder *folder;
        gchar *folder_uri;
        const gchar *display_name;
        GError *error = NULL;

        display_name = local_folder_names[ii];

        /* XXX This blocks but should be fast. */
        if (ii == E_MAIL_LOCAL_FOLDER_LOCAL_INBOX)
            folder = camel_store_get_inbox_folder_sync (
                CAMEL_STORE (service), NULL, &error);
        else
            folder = camel_store_get_folder_sync (
                CAMEL_STORE (service), display_name,
                CAMEL_STORE_FOLDER_CREATE, NULL, &error);

        folder_uri = e_mail_folder_uri_build (
            CAMEL_STORE (service), display_name);

        /* The arrays take ownership of the items added. */
        g_ptr_array_add (session->priv->local_folders, folder);
        g_ptr_array_add (session->priv->local_folder_uris, folder_uri);

        if (error != NULL) {
            g_critical ("%s: %s", G_STRFUNC, error->message);
            g_error_free (error);
        }
    }
}

static void
mail_session_configure_vfolder_store (EMailSession *session)
{
    CamelSession *camel_session;
    CamelService *service;
    const gchar *uid;

    camel_session = CAMEL_SESSION (session);

    uid = E_MAIL_SESSION_VFOLDER_UID;
    service = camel_session_ref_service (camel_session, uid);
    session->priv->vfolder_store = service;  /* takes ownership */
    g_return_if_fail (service != NULL);

    camel_service_connect_sync (service, NULL, NULL);

    /* XXX There's more configuration to do in vfolder_load_storage()
     *     but it requires an EMailBackend, which we don't have access
     *     to from here, so it has to be called from elsewhere.  Kinda
     *     thinking about reworking that... */
}

static void
mail_session_force_refresh (EMailSession *session)
{
    ESourceRegistry *registry;
    GHashTableIter iter;
    GSettings *settings;
    gboolean unconditionally;
    gpointer key;

    /* Only refresh when the session is online. */
    if (!camel_session_get_online (CAMEL_SESSION (session)))
        return;

    /* FIXME EMailSession should define properties for these. */
    settings = g_settings_new ("org.gnome.evolution.mail");
    unconditionally =
        g_settings_get_boolean (settings, "send-recv-on-start") &&
        g_settings_get_boolean (settings, "send-recv-all-on-start");
    g_object_unref (settings);

    registry = e_mail_session_get_registry (session);
    g_hash_table_iter_init (&iter, session->priv->auto_refresh_table);

    while (g_hash_table_iter_next (&iter, &key, NULL)) {
        ESource *source;
        ESourceRefresh *extension;
        const gchar *extension_name;
        gboolean refresh_enabled;

        /* The hash table key is the ESource UID. */
        source = e_source_registry_ref_source (registry, key);

        if (source == NULL)
            continue;

        extension_name = E_SOURCE_EXTENSION_REFRESH;
        extension = e_source_get_extension (source, extension_name);
        refresh_enabled = e_source_refresh_get_enabled (extension);

        if (refresh_enabled || unconditionally)
            e_source_refresh_force_timeout (source);

        g_object_unref (source);
    }
}

static void
mail_session_cancel_refresh (EMailSession *session)
{
    ESourceRegistry *registry;
    GHashTableIter iter;
    gpointer key, value;

    registry = e_mail_session_get_registry (session);
    g_hash_table_iter_init (&iter, session->priv->auto_refresh_table);

    while (g_hash_table_iter_next (&iter, &key, &value)) {
        ESource *source;
        guint timeout_id;

        /* The hash table key is the ESource UID. */
        source = e_source_registry_ref_source (registry, key);

        /* The hash table value is the refresh timeout ID. */
        timeout_id = GPOINTER_TO_UINT (value);

        if (source == NULL)
            continue;

        e_source_refresh_remove_timeout (source, timeout_id);

        g_object_unref (source);
    }

    /* All timeouts cancelled so clear the auto-refresh table. */
    g_hash_table_remove_all (session->priv->auto_refresh_table);
}

static gboolean
mail_session_idle_refresh_cb (EMailSession *session)
{
    /* This only runs once at startup (if settings allow). */

    if (camel_session_get_online (CAMEL_SESSION (session))) {
        mail_session_force_refresh (session);

        /* Also flush the Outbox. */
        g_signal_emit (session, signals[FLUSH_OUTBOX], 0);
    }

    /* Listen for network state changes and force a
     * mail store refresh when coming back online. */
    g_signal_connect (
        session, "notify::online",
        G_CALLBACK (mail_session_force_refresh), NULL);

    return FALSE;
}

static void
mail_session_set_registry (EMailSession *session,
                           ESourceRegistry *registry)
{
    g_return_if_fail (E_IS_SOURCE_REGISTRY (registry));
    g_return_if_fail (session->priv->registry == NULL);

    session->priv->registry = g_object_ref (registry);
}

static void
mail_session_set_property (GObject *object,
                           guint property_id,
                           const GValue *value,
                           GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_REGISTRY:
            mail_session_set_registry (
                E_MAIL_SESSION (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_session_get_property (GObject *object,
                           guint property_id,
                           GValue *value,
                           GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_FOLDER_CACHE:
            g_value_set_object (
                value,
                e_mail_session_get_folder_cache (
                E_MAIL_SESSION (object)));
            return;

        case PROP_LOCAL_STORE:
            g_value_set_object (
                value,
                e_mail_session_get_local_store (
                E_MAIL_SESSION (object)));
            return;

        case PROP_REGISTRY:
            g_value_set_object (
                value,
                e_mail_session_get_registry (
                E_MAIL_SESSION (object)));
            return;

        case PROP_VFOLDER_STORE:
            g_value_set_object (
                value,
                e_mail_session_get_vfolder_store (
                E_MAIL_SESSION (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_session_dispose (GObject *object)
{
    EMailSessionPrivate *priv;

    priv = E_MAIL_SESSION_GET_PRIVATE (object);

    if (priv->folder_cache != NULL) {
        g_object_unref (priv->folder_cache);
        priv->folder_cache = NULL;
    }

    g_ptr_array_set_size (priv->local_folders, 0);
    g_ptr_array_set_size (priv->local_folder_uris, 0);

    if (priv->preparing_flush > 0) {
        g_source_remove (priv->preparing_flush);
        priv->preparing_flush = 0;
    }

    if (priv->local_store != NULL) {
        g_object_unref (priv->local_store);
        priv->local_store = NULL;
    }

    if (priv->vfolder_store != NULL) {
        g_object_unref (priv->vfolder_store);
        priv->vfolder_store = NULL;
    }

    if (priv->registry != NULL) {
        g_signal_handler_disconnect (
            priv->registry,
            priv->source_added_handler_id);
        g_signal_handler_disconnect (
            priv->registry,
            priv->source_removed_handler_id);
        g_signal_handler_disconnect (
            priv->registry,
            priv->source_enabled_handler_id);
        g_signal_handler_disconnect (
            priv->registry,
            priv->source_disabled_handler_id);
        g_signal_handler_disconnect (
            priv->registry,
            priv->default_mail_account_handler_id);

        /* This requires the registry. */
        mail_session_cancel_refresh (E_MAIL_SESSION (object));

        g_object_unref (priv->registry);
        priv->registry = NULL;
    }

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (e_mail_session_parent_class)->dispose (object);
}

static void
mail_session_finalize (GObject *object)
{
    EMailSessionPrivate *priv;

    priv = E_MAIL_SESSION_GET_PRIVATE (object);

    g_hash_table_destroy (priv->auto_refresh_table);
    g_hash_table_destroy (priv->junk_filters);

    g_ptr_array_free (priv->local_folders, TRUE);
    g_ptr_array_free (priv->local_folder_uris, TRUE);

    g_mutex_clear (&priv->preparing_flush_lock);

    g_free (mail_data_dir);
    g_free (mail_config_dir);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (e_mail_session_parent_class)->finalize (object);
}

static void
mail_session_constructed (GObject *object)
{
    EMailSession *session;
    EExtensible *extensible;
    ESourceRegistry *registry;
    GType extension_type;
    GList *list, *link;
    GSettings *settings;
    CamelProviderType provider_type;
    const gchar *extension_name;
    gulong handler_id;

    session = E_MAIL_SESSION (object);
    registry = e_mail_session_get_registry (session);

    /* Chain up to parent's constructed() method. */
    G_OBJECT_CLASS (e_mail_session_parent_class)->constructed (object);

    /* Add available mail accounts. */

    provider_type = CAMEL_PROVIDER_STORE;
    extension_name = E_SOURCE_EXTENSION_MAIL_ACCOUNT;

    list = e_source_registry_list_sources (registry, extension_name);

    for (link = list; link != NULL; link = g_list_next (link)) {
        ESource *source = E_SOURCE (link->data);

        mail_session_add_from_source (session, provider_type, source);
    }

    g_list_free_full (list, (GDestroyNotify) g_object_unref);

    /* Add available mail transports. */

    provider_type = CAMEL_PROVIDER_TRANSPORT;
    extension_name = E_SOURCE_EXTENSION_MAIL_TRANSPORT;

    list = e_source_registry_list_sources (registry, extension_name);

    for (link = list; link != NULL; link = g_list_next (link)) {
        ESource *source = E_SOURCE (link->data);

        mail_session_add_from_source (session, provider_type, source);
    }

    g_list_free_full (list, (GDestroyNotify) g_object_unref);

    /* Built-in stores require extra configuration. */

    mail_session_configure_local_store (session);
    mail_session_configure_vfolder_store (session);

    /* Listen for registry changes. */

    handler_id = g_signal_connect (
        registry, "source-added",
        G_CALLBACK (mail_session_source_added_cb), session);
    session->priv->source_added_handler_id = handler_id;

    handler_id = g_signal_connect (
        registry, "source-removed",
        G_CALLBACK (mail_session_source_removed_cb), session);
    session->priv->source_removed_handler_id = handler_id;

    handler_id = g_signal_connect (
        registry, "source-enabled",
        G_CALLBACK (mail_session_source_enabled_cb), session);
    session->priv->source_enabled_handler_id = handler_id;

    handler_id = g_signal_connect (
        registry, "source-disabled",
        G_CALLBACK (mail_session_source_disabled_cb), session);
    session->priv->source_disabled_handler_id = handler_id;

    handler_id = g_signal_connect (
        registry, "notify::default-mail-account",
        G_CALLBACK (mail_session_default_mail_account_cb), session);
    session->priv->default_mail_account_handler_id = handler_id;

    extensible = E_EXTENSIBLE (object);
    e_extensible_load_extensions (extensible);

    /* Add junk filter extensions to an internal hash table. */

    extension_type = E_TYPE_MAIL_JUNK_FILTER;
    list = e_extensible_list_extensions (extensible, extension_type);

    for (link = list; link != NULL; link = g_list_next (link)) {
        EMailJunkFilter *junk_filter;
        EMailJunkFilterClass *class;

        junk_filter = E_MAIL_JUNK_FILTER (link->data);
        class = E_MAIL_JUNK_FILTER_GET_CLASS (junk_filter);

        if (!CAMEL_IS_JUNK_FILTER (junk_filter)) {
            g_warning (
                "Skipping %s: Does not implement "
                "CamelJunkFilterInterface",
                G_OBJECT_TYPE_NAME (junk_filter));
            continue;
        }

        if (class->filter_name == NULL) {
            g_warning (
                "Skipping %s: filter_name unset",
                G_OBJECT_TYPE_NAME (junk_filter));
            continue;
        }

        if (class->display_name == NULL) {
            g_warning (
                "Skipping %s: display_name unset",
                G_OBJECT_TYPE_NAME (junk_filter));
            continue;
        }

        /* No need to reference the EMailJunkFilter since
         * EMailSession owns the reference to it already. */
        g_hash_table_insert (
            session->priv->junk_filters,
            (gpointer) class->filter_name,
            junk_filter);
    }

    g_list_free (list);

    mail_config_reload_junk_headers (session);

    /* Initialize the legacy message-passing framework
     * before starting the first mail store refresh. */
    mail_msg_init ();

    settings = g_settings_new ("org.gnome.evolution.mail");

    /* The application is not yet fully initialized at this point,
     * so run the first mail store refresh from an idle callback. */
    if (g_settings_get_boolean (settings, "send-recv-on-start"))
        g_idle_add_full (
            G_PRIORITY_DEFAULT,
            (GSourceFunc) mail_session_idle_refresh_cb,
            g_object_ref (session),
            (GDestroyNotify) g_object_unref);

    g_object_unref (settings);
}

static CamelService *
mail_session_add_service (CamelSession *session,
                          const gchar *uid,
                          const gchar *protocol,
                          CamelProviderType type,
                          GError **error)
{
    ESourceRegistry *registry;
    CamelService *service;
    const gchar *extension_name;

    registry = e_mail_session_get_registry (E_MAIL_SESSION (session));
    extension_name = e_source_camel_get_extension_name (protocol);

    /* Chain up to parents add_service() method. */
    service = CAMEL_SESSION_CLASS (e_mail_session_parent_class)->
        add_service (session, uid, protocol, type, error);

    /* Configure the CamelService from the corresponding ESource. */

    if (CAMEL_IS_SERVICE (service)) {
        ESource *source;
        ESource *tmp_source;

        /* Each CamelService has a corresponding ESource. */
        source = e_source_registry_ref_source (registry, uid);
        g_return_val_if_fail (source != NULL, service);

        tmp_source = e_source_registry_find_extension (
            registry, source, extension_name);
        if (tmp_source != NULL) {
            g_object_unref (source);
            source = tmp_source;
        }

        /* This handles all the messy property bindings. */
        e_source_camel_configure_service (source, service);

        /* Track the proxy resolver for this service. */
        mail_session_configure_proxy_resolver (registry, service);

        g_object_bind_property (
            source, "display-name",
            service, "display-name",
            G_BINDING_SYNC_CREATE);

        /* Migrate files for this service from its old
         * URL-based directory to a UID-based directory
         * if necessary. */
        camel_service_migrate_files (service);

        g_object_unref (source);
    }

    return service;
}

static gchar *
mail_session_get_password (CamelSession *session,
                           CamelService *service,
                           const gchar *prompt,
                           const gchar *item,
                           guint32 flags,
                           GError **error)
{
    ESourceRegistry *registry;
    gchar *password = NULL;

    /* XXX This method is now only for fringe cases.  For normal
     *     CamelService authentication, use authenticate_sync().
     *
     *     The two known fringe cases that still need this are:
     *
     *     1) CamelSaslPOPB4SMTP, where the CamelService is an SMTP
     *        transport and the item name is always "popb4smtp_uid".
     *        (This is a dirty hack, Camel just needs some way to
     *        pair up a CamelService and CamelTransport.  Not sure
     *        what that should look like just yet...)
     *
     *     2) CamelGpgContext, where the CamelService is NULL and
     *        the item name is a user ID (I think).  (Seahorse, or
     *        one of its dependent libraries, ought to handle this
     *        transparently once Camel fully transitions to GIO.)
     */

    registry = e_mail_session_get_registry (E_MAIL_SESSION (session));

    /* Handle the CamelSaslPOPB4SMTP case. */
    if (g_strcmp0 (item, "popb4smtp_uid") == 0)
        return mail_session_resolve_popb4smtp (registry, service);

    /* Otherwise this had better be the CamelGpgContext case. */
    g_return_val_if_fail (service == NULL, NULL);

    password = e_passwords_get_password (item);

    if (password == NULL || (flags & CAMEL_SESSION_PASSWORD_REPROMPT)) {
        gboolean remember;
        guint eflags = 0;

        if (flags & CAMEL_SESSION_PASSWORD_STATIC)
            eflags |= E_PASSWORDS_REMEMBER_NEVER;
        else
            eflags |= E_PASSWORDS_REMEMBER_SESSION;

        if (flags & CAMEL_SESSION_PASSWORD_REPROMPT)
            eflags |= E_PASSWORDS_REPROMPT;

        if (flags & CAMEL_SESSION_PASSWORD_SECRET)
            eflags |= E_PASSWORDS_SECRET;

        if (flags & CAMEL_SESSION_PASSPHRASE)
            eflags |= E_PASSWORDS_PASSPHRASE;

        password = e_passwords_ask_password (
            "", item, prompt, eflags, &remember, NULL);

        if (password == NULL)
            e_passwords_forget_password (item);
    }

    if (password == NULL)
        g_set_error (
            error, G_IO_ERROR,
            G_IO_ERROR_CANCELLED,
            _("User cancelled operation"));

    return password;
}

static gboolean
mail_session_forget_password (CamelSession *session,
                              CamelService *service,
                              const gchar *item,
                              GError **error)
{
    /* XXX The only remaining user of this method is CamelGpgContext,
     *     which does not provide a CamelService.  Use 'item' as the
     *     password key. */

    g_return_val_if_fail (service == NULL, FALSE);

    e_passwords_forget_password (item);

    return TRUE;
}

static CamelCertTrust
mail_session_trust_prompt (CamelSession *session,
                           CamelService *service,
                           GTlsCertificate *certificate,
                           GTlsCertificateFlags errors)
{
    EUserPrompter *prompter;
    ENamedParameters *parameters;
    CamelSettings *settings;
    CamelCertTrust response;
    GByteArray *der = NULL;
    gchar *base64;
    gchar *errhex;
    gchar *host;
    gint button_index;

    prompter = e_user_prompter_new ();
    parameters = e_named_parameters_new ();

    settings = camel_service_ref_settings (service);
    g_return_val_if_fail (CAMEL_IS_NETWORK_SETTINGS (settings), 0);
    host = camel_network_settings_dup_host (
        CAMEL_NETWORK_SETTINGS (settings));
    g_object_unref (settings);

    /* XXX No accessor function for this property. */
    g_object_get (certificate, "certificate", &der, NULL);
    g_return_val_if_fail (der != NULL, 0);
    base64 = g_base64_encode (der->data, der->len);
    g_byte_array_unref (der);

    errhex = g_strdup_printf ("%x", (gint) errors);

    e_named_parameters_set (parameters, "host", host);
    e_named_parameters_set (parameters, "certificate", base64);
    e_named_parameters_set (parameters, "certificate-errors", errhex);

    g_free (host);
    g_free (base64);
    g_free (errhex);

    button_index = e_user_prompter_extension_prompt_sync (
        prompter, "ETrustPrompt::trust-prompt",
        parameters, NULL, NULL, NULL);

    switch (button_index) {
        case 0:
            response = CAMEL_CERT_TRUST_NEVER;
            break;
        case 1:
            response = CAMEL_CERT_TRUST_FULLY;
            break;
        case 2:
            response = CAMEL_CERT_TRUST_TEMPORARY;
            break;
        default:
            response = CAMEL_CERT_TRUST_UNKNOWN;
            break;
    }

    e_named_parameters_free (parameters);
    g_object_unref (prompter);

    return response;
}

static gboolean
mail_session_authenticate_sync (CamelSession *session,
                                CamelService *service,
                                const gchar *mechanism,
                                GCancellable *cancellable,
                                GError **error)
{
    ESource *source;
    ESourceRegistry *registry;
    ESourceAuthenticator *auth;
    CamelServiceAuthType *authtype = NULL;
    CamelAuthenticationResult result;
    const gchar *uid;
    gboolean authenticated;
    gboolean try_empty_password = FALSE;
    GError *local_error = NULL;

    /* Do not chain up.  Camel's default method is only an example for
     * subclasses to follow.  Instead we mimic most of its logic here. */

    registry = e_mail_session_get_registry (E_MAIL_SESSION (session));

    /* Treat a mechanism name of "none" as NULL. */
    if (g_strcmp0 (mechanism, "none") == 0)
        mechanism = NULL;

    /* APOP is one case where a non-SASL mechanism name is passed, so
     * don't bail if the CamelServiceAuthType struct comes back NULL. */
    if (mechanism != NULL)
        authtype = camel_sasl_authtype (mechanism);

    /* If the SASL mechanism does not involve a user
     * password, then it gets one shot to authenticate. */
    if (authtype != NULL && !authtype->need_password) {
        result = camel_service_authenticate_sync (
            service, mechanism, cancellable, error);
        if (result == CAMEL_AUTHENTICATION_REJECTED)
            g_set_error (
                error, CAMEL_SERVICE_ERROR,
                CAMEL_SERVICE_ERROR_CANT_AUTHENTICATE,
                _("%s authentication failed"), mechanism);
        return (result == CAMEL_AUTHENTICATION_ACCEPTED);
    }

    /* Some SASL mechanisms can attempt to authenticate without a
     * user password being provided (e.g. single-sign-on credentials),
     * but can fall back to a user password.  Handle that case next. */
    if (mechanism != NULL) {
        CamelProvider *provider;
        CamelSasl *sasl;
        const gchar *service_name;

        provider = camel_service_get_provider (service);
        service_name = provider->protocol;

        /* XXX Would be nice if camel_sasl_try_empty_password_sync()
         *     returned the result in an "out" parameter so it's
         *     easier to distinguish errors from a "no" answer.
         * YYY There are precisely two states. Either we appear to
         *     have credentials (although we don't yet know if the
         *     server would *accept* them, of course). Or we don't
         *     have any credentials, and we can't even try. There
         *     is no middle ground.
         *     N.B. For 'have credentials', read 'the ntlm_auth
         *          helper exists and at first glance seems to
         *          be responding sanely'. */
        sasl = camel_sasl_new (service_name, mechanism, service);
        if (sasl != NULL) {
            try_empty_password =
                camel_sasl_try_empty_password_sync (
                sasl, cancellable, &local_error);
            g_object_unref (sasl);
        }
    }

    /* Abort authentication if we got cancelled.
     * Otherwise clear any errors and press on. */
    if (g_error_matches (local_error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
        return FALSE;

    g_clear_error (&local_error);

    /* Find a matching ESource for this CamelService. */
    uid = camel_service_get_uid (service);
    source = e_source_registry_ref_source (registry, uid);

    if (source == NULL) {
        g_set_error (
            error, CAMEL_SERVICE_ERROR,
            CAMEL_SERVICE_ERROR_CANT_AUTHENTICATE,
            _("No data source found for UID '%s'"), uid);
        return FALSE;
    }

    auth = e_mail_authenticator_new (service, mechanism);

    result = CAMEL_AUTHENTICATION_REJECTED;

    if (try_empty_password) {
        result = camel_service_authenticate_sync (
            service, mechanism, cancellable, error);
    }

    if (result == CAMEL_AUTHENTICATION_REJECTED) {
        /* We need a password, preferrably one cached in
         * the keyring or else by interactive user prompt. */
        authenticated = e_source_registry_authenticate_sync (
            registry, source, auth, cancellable, error);
    } else {
        authenticated = (result == CAMEL_AUTHENTICATION_ACCEPTED);
    }
    g_object_unref (auth);

    g_object_unref (source);

    return authenticated;
}

static gboolean
mail_session_forward_to_sync (CamelSession *session,
                              CamelFolder *folder,
                              CamelMimeMessage *message,
                              const gchar *address,
                              GCancellable *cancellable,
                              GError **error)
{
    EMailSessionPrivate *priv;
    ESource *source;
    ESourceRegistry *registry;
    ESourceMailIdentity *extension;
    CamelMimeMessage *forward;
    CamelStream *mem;
    CamelInternetAddress *addr;
    CamelFolder *out_folder;
    CamelMessageInfo *info;
    CamelMedium *medium;
    const gchar *extension_name;
    const gchar *from_address;
    const gchar *from_name;
    const gchar *header_name;
    struct _camel_header_raw *xev;
    gboolean success;
    gchar *subject;

    g_return_val_if_fail (folder != NULL, FALSE);
    g_return_val_if_fail (message != NULL, FALSE);
    g_return_val_if_fail (address != NULL, FALSE);

    priv = E_MAIL_SESSION_GET_PRIVATE (session);

    if (!*address) {
        g_set_error (
            error, CAMEL_ERROR, CAMEL_ERROR_GENERIC,
            _("No destination address provided, forwarding "
            "of the message has been cancelled."));
        return FALSE;
    }

    registry = e_mail_session_get_registry (E_MAIL_SESSION (session));

    /* This returns a new ESource reference. */
    source = em_utils_guess_mail_identity_with_recipients (
        registry, message, folder, NULL);
    if (source == NULL) {
        g_set_error (
            error, CAMEL_ERROR, CAMEL_ERROR_GENERIC,
            _("No identity found to use, forwarding "
            "of the message has been cancelled."));
        return FALSE;
    }

    extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
    extension = e_source_get_extension (source, extension_name);
    from_address = e_source_mail_identity_get_address (extension);
    from_name = e_source_mail_identity_get_name (extension);

    forward = camel_mime_message_new ();

    /* make copy of the message, because we are going to modify it */
    mem = camel_stream_mem_new ();
    camel_data_wrapper_write_to_stream_sync (
        CAMEL_DATA_WRAPPER (message), mem, NULL, NULL);
    g_seekable_seek (G_SEEKABLE (mem), 0, G_SEEK_SET, NULL, NULL);
    camel_data_wrapper_construct_from_stream_sync (
        CAMEL_DATA_WRAPPER (forward), mem, NULL, NULL);
    g_object_unref (mem);

    /* clear previous recipients */
    camel_mime_message_set_recipients (
        forward, CAMEL_RECIPIENT_TYPE_TO, NULL);
    camel_mime_message_set_recipients (
        forward, CAMEL_RECIPIENT_TYPE_CC, NULL);
    camel_mime_message_set_recipients (
        forward, CAMEL_RECIPIENT_TYPE_BCC, NULL);
    camel_mime_message_set_recipients (
        forward, CAMEL_RECIPIENT_TYPE_RESENT_TO, NULL);
    camel_mime_message_set_recipients (
        forward, CAMEL_RECIPIENT_TYPE_RESENT_CC, NULL);
    camel_mime_message_set_recipients (
        forward, CAMEL_RECIPIENT_TYPE_RESENT_BCC, NULL);

    medium = CAMEL_MEDIUM (forward);

    /* remove all delivery and notification headers */
    header_name = "Disposition-Notification-To";
    while (camel_medium_get_header (medium, header_name))
        camel_medium_remove_header (medium, header_name);

    header_name = "Delivered-To";
    while (camel_medium_get_header (medium, header_name))
        camel_medium_remove_header (medium, header_name);

    /* remove any X-Evolution-* headers that may have been set */
    xev = mail_tool_remove_xevolution_headers (forward);
    camel_header_raw_clear (&xev);

    /* from */
    addr = camel_internet_address_new ();
    camel_internet_address_add (addr, from_name, from_address);
    camel_mime_message_set_from (forward, addr);
    g_object_unref (addr);

    /* to */
    addr = camel_internet_address_new ();
    camel_address_decode (CAMEL_ADDRESS (addr), address);
    camel_mime_message_set_recipients (
        forward, CAMEL_RECIPIENT_TYPE_TO, addr);
    g_object_unref (addr);

    /* subject */
    subject = mail_tool_generate_forward_subject (message);
    camel_mime_message_set_subject (forward, subject);
    g_free (subject);

    /* and send it */
    info = camel_message_info_new (NULL);
    out_folder = e_mail_session_get_local_folder (
        E_MAIL_SESSION (session), E_MAIL_LOCAL_FOLDER_OUTBOX);
    camel_message_info_set_flags (
        info, CAMEL_MESSAGE_SEEN, CAMEL_MESSAGE_SEEN);

    success = e_mail_folder_append_message_sync (
        out_folder, forward, info, NULL, cancellable, error);

    if (success) {
        GSettings *settings;
        gboolean flush_outbox;

        settings = g_settings_new ("org.gnome.evolution.mail");
        flush_outbox = g_settings_get_boolean (settings, "flush-outbox");
        g_object_unref (settings);

        g_mutex_lock (&priv->preparing_flush_lock);

        if (priv->preparing_flush > 0) {
            g_source_remove (priv->preparing_flush);
            flush_outbox = TRUE;
        }

        if (flush_outbox) {
            GMainContext *main_context;
            GSource *timeout_source;

            main_context =
                camel_session_ref_main_context (session);

            timeout_source =
                g_timeout_source_new_seconds (60);
            g_source_set_callback (
                timeout_source,
                session_forward_to_flush_outbox_cb,
                session, (GDestroyNotify) NULL);
            priv->preparing_flush = g_source_attach (
                timeout_source, main_context);
            g_source_unref (timeout_source);

            g_main_context_unref (main_context);
        }

        g_mutex_unlock (&priv->preparing_flush_lock);
    }

    camel_message_info_unref (info);

    g_object_unref (source);

    return success;
}

static EMVFolderContext *
mail_session_create_vfolder_context (EMailSession *session)
{
    return em_vfolder_context_new ();
}

static void
e_mail_session_class_init (EMailSessionClass *class)
{
    GObjectClass *object_class;
    CamelSessionClass *session_class;

    g_type_class_add_private (class, sizeof (EMailSessionPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = mail_session_set_property;
    object_class->get_property = mail_session_get_property;
    object_class->dispose = mail_session_dispose;
    object_class->finalize = mail_session_finalize;
    object_class->constructed = mail_session_constructed;

    session_class = CAMEL_SESSION_CLASS (class);
    session_class->add_service = mail_session_add_service;
    session_class->get_password = mail_session_get_password;
    session_class->forget_password = mail_session_forget_password;
    session_class->trust_prompt = mail_session_trust_prompt;
    session_class->authenticate_sync = mail_session_authenticate_sync;
    session_class->forward_to_sync = mail_session_forward_to_sync;

    class->create_vfolder_context = mail_session_create_vfolder_context;

    g_object_class_install_property (
        object_class,
        PROP_FOLDER_CACHE,
        g_param_spec_object (
            "folder-cache",
            NULL,
            NULL,
            MAIL_TYPE_FOLDER_CACHE,
            G_PARAM_READABLE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_LOCAL_STORE,
        g_param_spec_object (
            "local-store",
            "Local Store",
            "Built-in local store",
            CAMEL_TYPE_STORE,
            G_PARAM_READABLE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_REGISTRY,
        g_param_spec_object (
            "registry",
            "Registry",
            "Data source registry",
            E_TYPE_SOURCE_REGISTRY,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_VFOLDER_STORE,
        g_param_spec_object (
            "vfolder-store",
            "Search Folder Store",
            "Built-in search folder store",
            CAMEL_TYPE_STORE,
            G_PARAM_READABLE |
            G_PARAM_STATIC_STRINGS));

    /**
     * EMailSession::flush-outbox
     * @session: the email session
     *
     * Emitted if the send folder should be flushed.
     **/
    signals[FLUSH_OUTBOX] = g_signal_new (
        "flush-outbox",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_FIRST,
        G_STRUCT_OFFSET (EMailSessionClass, flush_outbox),
        NULL, NULL,
        g_cclosure_marshal_VOID__VOID,
        G_TYPE_NONE, 0);

    /**
     * EMailSession::refresh-service
     * @session: the #EMailSession that emitted the signal
     * @service: a #CamelService
     *
     * Emitted when @service should be refreshed.
     **/
    signals[REFRESH_SERVICE] = g_signal_new (
        "refresh-service",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (EMailSessionClass, refresh_service),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        CAMEL_TYPE_SERVICE);

    /**
     * EMailSession::store-added
     * @session: the #EMailSession that emitted the signal
     * @store: a #CamelStore
     *
     * Emitted when a store is added
     **/
    signals[STORE_ADDED] = g_signal_new (
        "store-added",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_FIRST,
        G_STRUCT_OFFSET (EMailSessionClass, store_added),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        CAMEL_TYPE_STORE);

    /**
     * EMailSession::store-removed
     * @session: the #EMailSession that emitted the signal
     * @store: a #CamelStore
     *
     * Emitted when a store is removed 
     **/
    signals[STORE_REMOVED] = g_signal_new (
        "store-removed",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_FIRST,
        G_STRUCT_OFFSET (EMailSessionClass, store_removed),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        CAMEL_TYPE_STORE);

    camel_null_store_register_provider ();

    /* Make sure ESourceCamel picks up the "none" provider. */
    e_source_camel_generate_subtype ("none", CAMEL_TYPE_SETTINGS);

    /* Make sure CamelSasl picks up the XOAUTH2 mechanism. */
    g_type_ensure (CAMEL_TYPE_SASL_XOAUTH2);
}

static void
e_mail_session_init (EMailSession *session)
{
    GHashTable *auto_refresh_table;
    GHashTable *junk_filters;

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

    junk_filters = g_hash_table_new (
        (GHashFunc) g_str_hash,
        (GEqualFunc) g_str_equal);

    session->priv = E_MAIL_SESSION_GET_PRIVATE (session);
    session->priv->folder_cache = mail_folder_cache_new ();
    session->priv->auto_refresh_table = auto_refresh_table;
    session->priv->junk_filters = junk_filters;

    session->priv->local_folders =
        g_ptr_array_new_with_free_func (
        (GDestroyNotify) g_object_unref);
    session->priv->local_folder_uris =
        g_ptr_array_new_with_free_func (
        (GDestroyNotify) g_free);

    g_mutex_init (&session->priv->preparing_flush_lock);
}

EMailSession *
e_mail_session_new (ESourceRegistry *registry)
{
    const gchar *user_data_dir;
    const gchar *user_cache_dir;

    g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), NULL);

    user_data_dir = mail_session_get_data_dir ();
    user_cache_dir = mail_session_get_cache_dir ();

    return g_object_new (
        E_TYPE_MAIL_SESSION,
        "user-data-dir", user_data_dir,
        "user-cache-dir", user_cache_dir,
        "registry", registry,
        NULL);
}

ESourceRegistry *
e_mail_session_get_registry (EMailSession *session)
{
    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);

    return session->priv->registry;
}

MailFolderCache *
e_mail_session_get_folder_cache (EMailSession *session)
{
    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);

    return session->priv->folder_cache;
}

CamelStore *
e_mail_session_get_local_store (EMailSession *session)
{
    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);

    return CAMEL_STORE (session->priv->local_store);
}

CamelFolder *
e_mail_session_get_local_folder (EMailSession *session,
                                 EMailLocalFolder type)
{
    GPtrArray *local_folders;
    CamelFolder *folder;

    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);

    local_folders = session->priv->local_folders;
    g_return_val_if_fail (type < local_folders->len, NULL);

    folder = g_ptr_array_index (local_folders, type);
    g_return_val_if_fail (CAMEL_IS_FOLDER (folder), NULL);

    return folder;
}

const gchar *
e_mail_session_get_local_folder_uri (EMailSession *session,
                                     EMailLocalFolder type)
{
    GPtrArray *local_folder_uris;
    const gchar *folder_uri;

    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);

    local_folder_uris = session->priv->local_folder_uris;
    g_return_val_if_fail (type < local_folder_uris->len, NULL);

    folder_uri = g_ptr_array_index (local_folder_uris, type);
    g_return_val_if_fail (folder_uri != NULL, NULL);

    return folder_uri;
}

GList *
e_mail_session_get_available_junk_filters (EMailSession *session)
{
    GList *list;

    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);

    list = g_hash_table_get_values (session->priv->junk_filters);

    /* Sort the available junk filters by display name. */
    return g_list_sort (list, (GCompareFunc) e_mail_junk_filter_compare);
}

/**
 * e_mail_session_get_junk_filter_by_name:
 * @session: an #EMailSession
 * @filter_name: a junk filter name
 *
 * Looks up an #EMailJunkFilter extension by its filter name, as specified
 * in its class structure.  If no match is found, the function returns %NULL.
 *
 * Returns: an #EMailJunkFilter, or %NULL
 **/
EMailJunkFilter *
e_mail_session_get_junk_filter_by_name (EMailSession *session,
                                        const gchar *filter_name)
{
    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);
    g_return_val_if_fail (filter_name != NULL, NULL);

    return g_hash_table_lookup (session->priv->junk_filters, filter_name);
}

static void
mail_session_get_inbox_thread (GSimpleAsyncResult *simple,
                               EMailSession *session,
                               GCancellable *cancellable)
{
    AsyncContext *context;
    GError *error = NULL;

    context = g_simple_async_result_get_op_res_gpointer (simple);

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

    if (error != NULL)
        g_simple_async_result_take_error (simple, error);
}

CamelFolder *
e_mail_session_get_inbox_sync (EMailSession *session,
                               const gchar *service_uid,
                               GCancellable *cancellable,
                               GError **error)
{
    CamelService *service;
    CamelFolder *folder = NULL;

    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);
    g_return_val_if_fail (service_uid != NULL, NULL);

    service = camel_session_ref_service (
        CAMEL_SESSION (session), service_uid);

    if (service == NULL)
        return NULL;

    if (!CAMEL_IS_STORE (service))
        goto exit;

    if (!camel_service_connect_sync (service, cancellable, error))
        goto exit;

    folder = camel_store_get_inbox_folder_sync (
        CAMEL_STORE (service), cancellable, error);

exit:
    g_object_unref (service);

    return folder;
}

void
e_mail_session_get_inbox (EMailSession *session,
                          const gchar *service_uid,
                          gint io_priority,
                          GCancellable *cancellable,
                          GAsyncReadyCallback callback,
                          gpointer user_data)
{
    GSimpleAsyncResult *simple;
    AsyncContext *context;

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

    context = g_slice_new0 (AsyncContext);
    context->uid = g_strdup (service_uid);

    simple = g_simple_async_result_new (
        G_OBJECT (session), callback,
        user_data, e_mail_session_get_inbox);

    g_simple_async_result_set_check_cancellable (simple, cancellable);

    g_simple_async_result_set_op_res_gpointer (
        simple, context, (GDestroyNotify) async_context_free);

    g_simple_async_result_run_in_thread (
        simple, (GSimpleAsyncThreadFunc)
        mail_session_get_inbox_thread,
        io_priority, cancellable);

    g_object_unref (simple);
}

CamelFolder *
e_mail_session_get_inbox_finish (EMailSession *session,
                                 GAsyncResult *result,
                                 GError **error)
{
    GSimpleAsyncResult *simple;
    AsyncContext *context;

    g_return_val_if_fail (
        g_simple_async_result_is_valid (
        result, G_OBJECT (session),
        e_mail_session_get_inbox), NULL);

    simple = G_SIMPLE_ASYNC_RESULT (result);
    context = g_simple_async_result_get_op_res_gpointer (simple);

    if (g_simple_async_result_propagate_error (simple, error))
        return NULL;

    g_return_val_if_fail (CAMEL_IS_FOLDER (context->folder), NULL);

    return g_object_ref (context->folder);
}

static void
mail_session_get_trash_thread (GSimpleAsyncResult *simple,
                               EMailSession *session,
                               GCancellable *cancellable)
{
    AsyncContext *context;
    GError *error = NULL;

    context = g_simple_async_result_get_op_res_gpointer (simple);

    context->folder = e_mail_session_get_trash_sync (
        session, context->uid, cancellable, &error);

    if (error != NULL)
        g_simple_async_result_take_error (simple, error);
}

CamelFolder *
e_mail_session_get_trash_sync (EMailSession *session,
                               const gchar *service_uid,
                               GCancellable *cancellable,
                               GError **error)
{
    CamelService *service;
    CamelFolder *folder = NULL;

    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);
    g_return_val_if_fail (service_uid != NULL, NULL);

    service = camel_session_ref_service (
        CAMEL_SESSION (session), service_uid);

    if (service == NULL)
        return NULL;

    if (!CAMEL_IS_STORE (service))
        goto exit;

    if (!camel_service_connect_sync (service, cancellable, error))
        goto exit;

    folder = camel_store_get_trash_folder_sync (
        CAMEL_STORE (service), cancellable, error);

exit:
    g_object_unref (service);

    return folder;
}

void
e_mail_session_get_trash (EMailSession *session,
                          const gchar *service_uid,
                          gint io_priority,
                          GCancellable *cancellable,
                          GAsyncReadyCallback callback,
                          gpointer user_data)
{
    GSimpleAsyncResult *simple;
    AsyncContext *context;

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

    context = g_slice_new0 (AsyncContext);
    context->uid = g_strdup (service_uid);

    simple = g_simple_async_result_new (
        G_OBJECT (session), callback,
        user_data, e_mail_session_get_trash);

    g_simple_async_result_set_check_cancellable (simple, cancellable);

    g_simple_async_result_set_op_res_gpointer (
        simple, context, (GDestroyNotify) async_context_free);

    g_simple_async_result_run_in_thread (
        simple, (GSimpleAsyncThreadFunc)
        mail_session_get_trash_thread,
        io_priority, cancellable);

    g_object_unref (simple);
}

CamelFolder *
e_mail_session_get_trash_finish (EMailSession *session,
                                 GAsyncResult *result,
                                 GError **error)
{
    GSimpleAsyncResult *simple;
    AsyncContext *context;

    g_return_val_if_fail (
        g_simple_async_result_is_valid (
        result, G_OBJECT (session),
        e_mail_session_get_trash), NULL);

    simple = G_SIMPLE_ASYNC_RESULT (result);
    context = g_simple_async_result_get_op_res_gpointer (simple);

    if (g_simple_async_result_propagate_error (simple, error))
        return NULL;

    g_return_val_if_fail (CAMEL_IS_FOLDER (context->folder), NULL);

    return g_object_ref (context->folder);
}

static void
mail_session_uri_to_folder_thread (GSimpleAsyncResult *simple,
                                   EMailSession *session,
                                   GCancellable *cancellable)
{
    AsyncContext *context;
    GError *error = NULL;

    context = g_simple_async_result_get_op_res_gpointer (simple);

    context->folder = e_mail_session_uri_to_folder_sync (
        session, context->uri, context->flags,
        cancellable, &error);

    if (error != NULL)
        g_simple_async_result_take_error (simple, error);
}

CamelFolder *
e_mail_session_uri_to_folder_sync (EMailSession *session,
                                   const gchar *folder_uri,
                                   CamelStoreGetFolderFlags flags,
                                   GCancellable *cancellable,
                                   GError **error)
{
    CamelStore *store;
    CamelFolder *folder;
    gchar *folder_name;
    gboolean success;

    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);
    g_return_val_if_fail (folder_uri != NULL, NULL);

    success = e_mail_folder_uri_parse (
        CAMEL_SESSION (session), folder_uri,
        &store, &folder_name, error);

    if (!success)
        return NULL;

    folder = camel_store_get_folder_sync (
        store, folder_name, flags, cancellable, error);

    if (folder != NULL) {
        MailFolderCache *folder_cache;
        folder_cache = e_mail_session_get_folder_cache (session);
        mail_folder_cache_note_folder (folder_cache, folder);
    }

    g_free (folder_name);
    g_object_unref (store);

    return folder;
}

void
e_mail_session_uri_to_folder (EMailSession *session,
                              const gchar *folder_uri,
                              CamelStoreGetFolderFlags flags,
                              gint io_priority,
                              GCancellable *cancellable,
                              GAsyncReadyCallback callback,
                              gpointer user_data)
{
    GSimpleAsyncResult *simple;
    AsyncContext *context;

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

    context = g_slice_new0 (AsyncContext);
    context->uri = g_strdup (folder_uri);
    context->flags = flags;

    simple = g_simple_async_result_new (
        G_OBJECT (session), callback,
        user_data, e_mail_session_uri_to_folder);

    g_simple_async_result_set_check_cancellable (simple, cancellable);

    g_simple_async_result_set_op_res_gpointer (
        simple, context, (GDestroyNotify) async_context_free);

    g_simple_async_result_run_in_thread (
        simple, (GSimpleAsyncThreadFunc)
        mail_session_uri_to_folder_thread,
        io_priority, cancellable);

    g_object_unref (simple);
}

CamelFolder *
e_mail_session_uri_to_folder_finish (EMailSession *session,
                                     GAsyncResult *result,
                                     GError **error)
{
    GSimpleAsyncResult *simple;
    AsyncContext *context;

    g_return_val_if_fail (
        g_simple_async_result_is_valid (
        result, G_OBJECT (session),
        e_mail_session_uri_to_folder), NULL);

    simple = G_SIMPLE_ASYNC_RESULT (result);
    context = g_simple_async_result_get_op_res_gpointer (simple);

    if (g_simple_async_result_propagate_error (simple, error))
        return NULL;

    g_return_val_if_fail (CAMEL_IS_FOLDER (context->folder), NULL);

    return g_object_ref (context->folder);
}

gboolean
e_binding_transform_service_to_source (GBinding *binding,
                                       const GValue *source_value,
                                       GValue *target_value,
                                       gpointer session)
{
    CamelService *service;
    ESourceRegistry *registry;
    ESource *source;
    const gchar *uid;
    gboolean success = FALSE;

    g_return_val_if_fail (G_IS_BINDING (binding), FALSE);
    g_return_val_if_fail (E_IS_MAIL_SESSION (session), FALSE);

    service = g_value_get_object (source_value);

    if (!CAMEL_IS_SERVICE (service))
        return FALSE;

    uid = camel_service_get_uid (service);
    registry = e_mail_session_get_registry (session);
    source = e_source_registry_ref_source (registry, uid);

    if (source != NULL) {
        g_value_take_object (target_value, source);
        success = TRUE;
    }

    return success;
}

gboolean
e_binding_transform_source_to_service (GBinding *binding,
                                       const GValue *source_value,
                                       GValue *target_value,
                                       gpointer session)
{
    CamelService *service;
    ESource *source;
    const gchar *uid;

    g_return_val_if_fail (G_IS_BINDING (binding), FALSE);
    g_return_val_if_fail (E_IS_MAIL_SESSION (session), FALSE);

    source = g_value_get_object (source_value);

    if (!E_IS_SOURCE (source))
        return FALSE;

    uid = e_source_get_uid (source);
    service = camel_session_ref_service (session, uid);

    if (service == NULL)
        return FALSE;

    g_value_take_object (target_value, service);

    return TRUE;
}

/******************************** Legacy API *********************************/

void
mail_session_flush_filter_log (EMailSession *session)
{
    g_return_if_fail (E_IS_MAIL_SESSION (session));

    if (session->priv->filter_logfile)
        fflush (session->priv->filter_logfile);
}

const gchar *
mail_session_get_data_dir (void)
{
    if (G_UNLIKELY (mail_data_dir == NULL))
        mail_data_dir = g_build_filename (
            e_get_user_data_dir (), "mail", NULL);

    return mail_data_dir;
}

const gchar *
mail_session_get_cache_dir (void)
{
    if (G_UNLIKELY (mail_cache_dir == NULL))
        mail_cache_dir = g_build_filename (
            e_get_user_cache_dir (), "mail", NULL);

    return mail_cache_dir;
}

const gchar *
mail_session_get_config_dir (void)
{
    if (G_UNLIKELY (mail_config_dir == NULL))
        mail_config_dir = g_build_filename (
            e_get_user_config_dir (), "mail", NULL);

    return mail_config_dir;
}

CamelStore *
e_mail_session_get_vfolder_store (EMailSession *session)
{
    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);

    return CAMEL_STORE (session->priv->vfolder_store);
}

EMVFolderContext *
e_mail_session_create_vfolder_context (EMailSession *session)
{
    EMailSessionClass *class;

    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);

    class = E_MAIL_SESSION_GET_CLASS (session);
    g_return_val_if_fail (class->create_vfolder_context != NULL, NULL);

    return class->create_vfolder_context (session);
}