path: root/libemail-engine/camel-sasl-xoauth2.c

/*
 * camel-sasl-xoauth2.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; 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/>
 *
 */

#include <config.h>
#include <glib/gi18n-lib.h>

#include "camel-sasl-xoauth2.h"

#include <libemail-engine/e-mail-session.h>

static CamelServiceAuthType sasl_xoauth2_auth_type = {
    N_("OAuth2"),
    N_("This option will use an OAuth 2.0 "
       "access token to connect to the server"),
    "XOAUTH2",
    FALSE
};

G_DEFINE_TYPE (CamelSaslXOAuth2, camel_sasl_xoauth2, CAMEL_TYPE_SASL)

static void
sasl_xoauth2_append_request (GByteArray *byte_array,
                             const gchar *user,
                             const gchar *access_token)
{
    GString *request;

    g_return_if_fail (user != NULL);
    g_return_if_fail (access_token != NULL);

    /* Compared to OAuth 1.0, this step is trivial. */

    /* The request is easier to assemble with a GString. */
    request = g_string_sized_new (512);

    g_string_append (request, "user=");
    g_string_append (request, user);
    g_string_append_c (request, 1);
    g_string_append (request, "auth=Bearer ");
    g_string_append (request, access_token);
    g_string_append_c (request, 1);
    g_string_append_c (request, 1);

    /* Copy the GString content to the GByteArray. */
    g_byte_array_append (
        byte_array, (guint8 *) request->str, request->len);

    g_string_free (request, TRUE);
}

static GByteArray *
sasl_xoauth2_challenge_sync (CamelSasl *sasl,
                             GByteArray *token,
                             GCancellable *cancellable,
                             GError **error)
{
    GByteArray *byte_array = NULL;
    CamelService *service;
    CamelSession *session;
    CamelSettings *settings;
    ESourceRegistry *registry;
    ESource *source;
    const gchar *uid;
    gchar *access_token = NULL;
    gboolean success;

    service = camel_sasl_get_service (sasl);
    session = camel_service_ref_session (service);
    settings = camel_service_ref_settings (service);

    uid = camel_service_get_uid (service);
    registry = e_mail_session_get_registry (E_MAIL_SESSION (session));
    source = e_source_registry_ref_source (registry, uid);
    g_return_val_if_fail (source != NULL, NULL);

    success = e_source_get_oauth2_access_token_sync (
        source, cancellable, &access_token, NULL, error);

    if (success) {
        CamelNetworkSettings *network_settings;
        gchar *user;

        network_settings = CAMEL_NETWORK_SETTINGS (settings);
        user = camel_network_settings_dup_user (network_settings);

        byte_array = g_byte_array_new ();
        sasl_xoauth2_append_request (byte_array, user, access_token);

        g_free (user);
    }

    g_free (access_token);

    g_object_unref (source);
    g_object_unref (settings);
    g_object_unref (session);

    /* IMAP and SMTP services will Base64-encode the request. */

    return byte_array;
}

static void
camel_sasl_xoauth2_class_init (CamelSaslXOAuth2Class *class)
{
    CamelSaslClass *sasl_class;

    sasl_class = CAMEL_SASL_CLASS (class);
    sasl_class->auth_type = &sasl_xoauth2_auth_type;
    sasl_class->challenge_sync = sasl_xoauth2_challenge_sync;
}

static void
camel_sasl_xoauth2_init (CamelSaslXOAuth2 *sasl)
{
}