[evolution] Add 'OAuth2 Google' authentication type to Google-based accounts

[Milan Crha <mcrha src gnome org>]

commit 24c65e30261ef3aae2a6583e9697574d2f35b3e4
Author: Milan Crha <mcrha redhat com>
Date:   Wed Sep 7 11:12:30 2016 +0200

    Add 'OAuth2 Google' authentication type to Google-based accounts
    
    The 'OAuth2 Google' authentication is unknown to Camel, thus it cannot
    offer it on its own.

 libemail-engine/e-mail-session.c |   31 ++++++++++++++++++++++++++++++-
 1 files changed, 30 insertions(+), 1 deletions(-)
---
diff --git a/libemail-engine/e-mail-session.c b/libemail-engine/e-mail-session.c
index e38c813..23f1ad8 100644
--- a/libemail-engine/e-mail-session.c
+++ b/libemail-engine/e-mail-session.c
@@ -32,7 +32,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include <glib/gi18n.h>
+#include <glib/gi18n-lib.h>
 #include <glib/gstdio.h>
 
 #include <gtk/gtk.h>
@@ -1200,6 +1200,7 @@ mail_session_add_service (CamelSession *session,
        if (CAMEL_IS_SERVICE (service)) {
                ESource *source;
                ESource *tmp_source;
+               gboolean is_google = FALSE;
 
                /* Each CamelService has a corresponding ESource. */
                source = e_source_registry_ref_source (registry, uid);
@@ -1228,7 +1229,35 @@ mail_session_add_service (CamelSession *session,
                 * if necessary. */
                camel_service_migrate_files (service);
 
+               if (e_source_has_extension (source, E_SOURCE_EXTENSION_AUTHENTICATION)) {
+                       ESourceAuthentication *auth_extension;
+                       const gchar *host;
+
+                       auth_extension = e_source_get_extension (source, E_SOURCE_EXTENSION_AUTHENTICATION);
+                       host = e_source_authentication_get_host (auth_extension);
+
+                       is_google = host && (
+                               e_util_utf8_strstrcase (host, "gmail.com") != NULL ||
+                               e_util_utf8_strstrcase (host, "googlemail.com") != NULL);
+               }
+
                g_object_unref (source);
+
+               /* Kind of hack for the custom SASL authentication unknown to Camel. */
+               if (is_google) {
+                       CamelProvider *provider;
+                       CamelSaslOAuth2GoogleClass *oauth2_google_class;
+
+                       oauth2_google_class = g_type_class_ref (CAMEL_TYPE_SASL_OAUTH2_GOOGLE);
+                       provider = camel_service_get_provider (service);
+
+                       if (provider && oauth2_google_class) {
+                               CamelServiceAuthType *auth_type = oauth2_google_class->parent_class.auth_type;
+
+                               if (!g_list_find (provider->authtypes, auth_type))
+                                       provider->authtypes = g_list_append (provider->authtypes, auth_type);
+                       }
+               }
        }
 
        return service;