[gnome-online-accounts] facebook: Make it work with Graph API > 2.3

[Debarshi Ray <debarshir src gnome org>]

commit 3b79cec85d0cd4e9161eeac74726442e02a8aa30
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Aug 2 19:19:31 2017 +0200

    facebook: Make it work with Graph API > 2.3
    
    Ever since version 2.3 of the Graph API was retired on 8th July, it
    stopped including "email" in the JSON when a GET request is issued
    against https://graph.facebook.com/me?access_token=...
    
    Now it needs to be explicitly asked for. The changelog [1] for version
    2.4 says:
      "To try to improve performance on mobile networks, Nodes and Edges
       in v2.4 requires that you explicitly request the field(s) you need
       for your GET requests. For example, GET /v2.4/me/feed no longer
       includes likes and comments by default, but GET
       /v2.4/me/feed?fields=comments,likes will return the data."
    
    It seems that "id" is always included, but we mention it anyway.
    
    The "username" fallback that was added in commit 10c77f1713be2215 has
    been removed because requesting it leads to:
      {
        "error": {
          "message": "(#12) username field is deprecated for versions v2.0
                      and higher",
          "type": "OAuthException",
          "code": 12,
          "fbtrace_id": "AJYNXiIv00W"
        }
      }
    
    We will have to investigate whether we need a new fallback for the
    presentation identity.
    
    [1] https://developers.facebook.com/docs/apps/changelog
    
    https://bugzilla.gnome.org/show_bug.cgi?id=785726

 src/goabackend/goafacebookprovider.c |   19 +++++++++----------
 1 files changed, 9 insertions(+), 10 deletions(-)
---
diff --git a/src/goabackend/goafacebookprovider.c b/src/goabackend/goafacebookprovider.c
index 688074e..53cf1a3 100644
--- a/src/goabackend/goafacebookprovider.c
+++ b/src/goabackend/goafacebookprovider.c
@@ -162,7 +162,10 @@ get_identity_sync (GoaOAuth2Provider  *oauth2_provider,
   proxy = rest_proxy_new ("https://graph.facebook.com/me";, FALSE);
   call = rest_proxy_new_call (proxy);
   rest_proxy_call_set_method (call, "GET");
-  rest_proxy_call_add_param (call, "access_token", access_token);
+  rest_proxy_call_add_params (call,
+                              "access_token", access_token,
+                              "fields", "id,email",
+                              NULL);
 
   if (!rest_proxy_call_sync (call, error))
     goto out;
@@ -209,20 +212,16 @@ get_identity_sync (GoaOAuth2Provider  *oauth2_provider,
                    _("Could not parse response"));
       goto out;
     }
-
-  id = g_strdup (json_object_get_string_member (json_object, "id"));
-
-  if (json_object_has_member (json_object, "email"))
-    presentation_identity = g_strdup (json_object_get_string_member (json_object, "email"));
-  else if (json_object_has_member (json_object, "username"))
-    presentation_identity = g_strdup (json_object_get_string_member (json_object, "username"));
-  else
+  if (!json_object_has_member (json_object, "email"))
     {
-      g_warning ("Did not find email or username in JSON data");
+      g_warning ("Did not find email in JSON data");
       g_set_error (error, GOA_ERROR, GOA_ERROR_FAILED, _("Could not parse response"));
       goto out;
     }
 
+  id = g_strdup (json_object_get_string_member (json_object, "id"));
+  presentation_identity = g_strdup (json_object_get_string_member (json_object, "email"));
+
   ret = id;
   id = NULL;
   if (out_presentation_identity != NULL)