[evolution-data-server] Bug 790267 - Expired Google OAuth2 token not refreshed

[Milan Crha <mcrha src gnome org>]

commit 8c18d26ae7c3c91d694bd612af8daad68597fe92
Author: Milan Crha <mcrha redhat com>
Date:   Mon Nov 20 16:16:23 2017 +0100

    Bug 790267 - Expired Google OAuth2 token not refreshed

 .../e-source-credentials-provider-impl-google.c    |   18 +++++++++++++-----
 1 files changed, 13 insertions(+), 5 deletions(-)
---
diff --git a/src/libedataserver/e-source-credentials-provider-impl-google.c 
b/src/libedataserver/e-source-credentials-provider-impl-google.c
index 21a7f2c..0b60cb3 100644
--- a/src/libedataserver/e-source-credentials-provider-impl-google.c
+++ b/src/libedataserver/e-source-credentials-provider-impl-google.c
@@ -126,6 +126,7 @@ e_source_credentials_google_util_get_access_token_from_secret (const gchar *secr
 
 static gboolean
 e_source_credentials_google_util_lookup_secret_for_source_sync (ESource *source,
+                                                               gboolean can_return_expired,
                                                                GCancellable *cancellable,
                                                                ENamedParameters **out_credentials,
                                                                GError **error)
@@ -159,9 +160,11 @@ e_source_credentials_google_util_lookup_secret_for_source_sync (ESource *source,
        }
 
        if (e_source_credentials_google_util_get_access_token_from_secret (secret, &access_token)) {
-               *out_credentials = e_named_parameters_new ();
-               e_named_parameters_set (*out_credentials, E_SOURCE_CREDENTIAL_GOOGLE_SECRET, secret);
-               e_named_parameters_set (*out_credentials, E_SOURCE_CREDENTIAL_PASSWORD, access_token);
+               if (access_token || can_return_expired) {
+                       *out_credentials = e_named_parameters_new ();
+                       e_named_parameters_set (*out_credentials, E_SOURCE_CREDENTIAL_GOOGLE_SECRET, secret);
+                       e_named_parameters_set (*out_credentials, E_SOURCE_CREDENTIAL_PASSWORD, access_token);
+               }
        }
 
        e_util_safe_free_string (access_token);
@@ -189,7 +192,7 @@ e_source_credentials_provider_impl_google_lookup_sync (ESourceCredentialsProvide
                return FALSE;
        }
 
-       return e_source_credentials_google_util_lookup_secret_for_source_sync (source, cancellable, 
out_credentials, error);
+       return e_source_credentials_google_util_lookup_secret_for_source_sync (source, FALSE, cancellable, 
out_credentials, error);
 }
 
 static gboolean
@@ -540,7 +543,7 @@ e_source_credentials_google_get_access_token_sync (ESource *source,
        /* Maybe some other part refreshed the token already and stored it into the secret store,
           thus try to read it and use it, if it contains proper data.
        */
-       if (e_source_credentials_google_util_lookup_secret_for_source_sync (source, cancellable, 
&tmp_credentials, error) &&
+       if (e_source_credentials_google_util_lookup_secret_for_source_sync (source, TRUE, cancellable, 
&tmp_credentials, error) &&
            e_source_credentials_google_extract_from_credentials_valid_only (tmp_credentials, 
out_access_token, out_expires_in_seconds)) {
                e_named_parameters_free (tmp_credentials);
 
@@ -713,6 +716,11 @@ e_source_credentials_google_util_decode_from_secret (const gchar *secret,
                                                *out_value = g_strdup_printf ("%" G_GINT64_FORMAT, iv64);
                                }
                        }
+
+                       if (*out_value && !**out_value) {
+                               g_free (*out_value);
+                               *out_value = NULL;
+                       }
                }
 
                json_reader_end_member (reader);