[evolution-data-server] CalDAV: Add support for OAuth 2.0 authentication.

[Matthew Barnes <mbarnes src gnome org>]

commit 54e876d3fc25ec59c58beda915a8c9d1f8d5f101
Author: Matthew Barnes <mbarnes redhat com>
Date:   Tue Jul 9 17:06:16 2013 -0400

    CalDAV: Add support for OAuth 2.0 authentication.

 calendar/backends/caldav/e-cal-backend-caldav.c |   46 ++++++++++++++++++++++-
 1 files changed, 45 insertions(+), 1 deletions(-)
---
diff --git a/calendar/backends/caldav/e-cal-backend-caldav.c b/calendar/backends/caldav/e-cal-backend-caldav.c
index 58c70b6..58f0654 100644
--- a/calendar/backends/caldav/e-cal-backend-caldav.c
+++ b/calendar/backends/caldav/e-cal-backend-caldav.c
@@ -968,6 +968,32 @@ parse_propfind_response (SoupMessage *message,
 /* Authentication helpers for libsoup */
 
 static void
+soup_authenticate_bearer (SoupSession *session,
+                          SoupMessage *message,
+                          SoupAuth *auth,
+                          ESource *source)
+{
+       gchar *access_token = NULL;
+       gint expires_in_seconds = -1;
+       GError *local_error = NULL;
+
+       e_source_get_oauth2_access_token_sync (
+               source, NULL, &access_token,
+               &expires_in_seconds, &local_error);
+
+       e_soup_auth_bearer_set_access_token (
+               E_SOUP_AUTH_BEARER (auth),
+               access_token, expires_in_seconds);
+
+       if (local_error != NULL) {
+               g_warning ("%s: %s", G_STRFUNC, local_error->message);
+               g_error_free (local_error);
+       }
+
+       g_free (access_token);
+}
+
+static void
 soup_authenticate (SoupSession *session,
                    SoupMessage *msg,
                    SoupAuth *auth,
@@ -985,8 +1011,14 @@ soup_authenticate (SoupSession *session,
        extension_name = E_SOURCE_EXTENSION_AUTHENTICATION;
        auth_extension = e_source_get_extension (source, extension_name);
 
+       if (retrying)
+               return;
+
+       if (E_IS_SOUP_AUTH_BEARER (auth)) {
+               soup_authenticate_bearer (session, msg, auth, source);
+
        /* do not send same password twice, but keep it for later use */
-       if (!retrying && cbdav->priv->password != NULL) {
+       } else if (cbdav->priv->password != NULL) {
                gchar *user;
 
                user = e_source_authentication_dup_user (auth_extension);
@@ -5194,6 +5226,8 @@ cal_backend_caldav_constructed (GObject *object)
 static void
 e_cal_backend_caldav_init (ECalBackendCalDAV *cbdav)
 {
+       SoupSessionFeature *feature;
+
        cbdav->priv = E_CAL_BACKEND_CALDAV_GET_PRIVATE (cbdav);
        cbdav->priv->session = soup_session_sync_new ();
        g_object_set (
@@ -5203,6 +5237,16 @@ e_cal_backend_caldav_init (ECalBackendCalDAV *cbdav)
                SOUP_SESSION_SSL_USE_SYSTEM_CA_FILE, TRUE,
                NULL);
 
+       /* XXX SoupAuthManager is public API as of libsoup 2.42, but
+        *     this isn't worth bumping our libsoup requirement over.
+        *     So get the SoupAuthManager GType by its type name. */
+       feature = soup_session_get_feature (
+               cbdav->priv->session,
+               g_type_from_name ("SoupAuthManager"));
+
+       /* Add the "Bearer" auth type to support OAuth 2.0. */
+       soup_session_feature_add_feature (feature, E_TYPE_SOUP_AUTH_BEARER);
+
        cbdav->priv->proxy = e_proxy_new ();
        e_proxy_setup_proxy (cbdav->priv->proxy);
        g_signal_connect (cbdav->priv->proxy, "changed", G_CALLBACK (proxy_settings_changed), cbdav->priv);