[shotwell] google: Extract access token expiry time

[Jens Georg <jensgeorg src gnome org>]

commit e63a88e328ab268e3cea3d178a47e519f2e03b87
Author: Jens Georg <mail jensge org>
Date:   Tue Feb 21 23:48:07 2017 +0100

    google: Extract access token expiry time
    
    Signed-off-by: Jens Georg <mail jensge org>

 .../shotwell/GoogleAuthenticator.vala              |   18 +++++++++++++++++-
 1 files changed, 17 insertions(+), 1 deletions(-)
---
diff --git a/plugins/authenticator/shotwell/GoogleAuthenticator.vala 
b/plugins/authenticator/shotwell/GoogleAuthenticator.vala
index 6d9dd19..9271b57 100644
--- a/plugins/authenticator/shotwell/GoogleAuthenticator.vala
+++ b/plugins/authenticator/shotwell/GoogleAuthenticator.vala
@@ -37,6 +37,7 @@ namespace Publishing.Authenticator.Shotwell.Google {
     private class Session : Publishing.RESTSupport.Session {
         public string access_token = null;
         public string refresh_token = null;
+        public int64 expires_at = -1;
 
         public override bool is_authenticated() {
             return (access_token != null);
@@ -45,6 +46,7 @@ namespace Publishing.Authenticator.Shotwell.Google {
         public void deauthenticate() {
             access_token = null;
             refresh_token = null;
+            expires_at = -1;
         }
     }
 
@@ -153,7 +155,6 @@ namespace Publishing.Authenticator.Shotwell.Google {
             web_auth_pane.authorized.connect(on_web_auth_pane_authorized);
 
             host.install_dialog_pane(web_auth_pane);
-
         }
 
         private void on_web_auth_pane_authorized(string auth_code) {
@@ -222,6 +223,12 @@ namespace Publishing.Authenticator.Shotwell.Google {
                 return;
             }
 
+            if (response_obj.has_member("expires_in")) {
+                var duration = response_obj.get_int_member("expires_in");
+                var abs_time = GLib.get_real_time() + duration * 1000L * 1000L;
+                on_expiry_time_avilable(abs_time);
+            }
+
             if (response_obj.has_member("refresh_token")) {
                 string refresh_token = response_obj.get_string_member("refresh_token");
 
@@ -244,6 +251,15 @@ namespace Publishing.Authenticator.Shotwell.Google {
             session.refresh_token = token;
         }
 
+        private void on_expiry_time_avilable(int64 abs_time) {
+            debug("EVENT: an OAuth access token expiry time became available; time = %'" + int64.FORMAT +
+                    "'.", abs_time);
+
+            session.expires_at = abs_time;
+            this.params.insert("ExpiryTime", new Variant.int64(abs_time));
+        }
+
+
         private void on_access_token_available(string token) {
             debug("EVENT: an OAuth access token has become available; token = '%s'.", token);