Example with pragma sql:gs-app-callback

The following example demonstrates usage of the sql:gs-app-callback pragma.

  1. Make sure the steps from the Blogs and Resource Sharing Examples are performed.
  2. Let user for ex. "Anna" of application to get full access to graphs whose IRIs contain user's name in path. In addition, let all of them permission to use all graph groups and let the "moderator" user read everything: 

    reconnect "dba";

create function DB.DBA.SPARQL_GS_APP_CALLBACK_TEST (in g_iid IRI_ID, in app_uid varchar) returns integer
{
  declare g_uri varchar;
-- A fake IRI ID #i0 is used to mention account's default permissions for all graphs.
  if (#i0 = g_iid)
    {
      if ('moderator' = app_uid)
        return 9; -- Moderator can read and list everything.
      return 8; -- Other users can list everything.
    }
  g_uri := id_to_iri (g_iid);
  if (strstr (g_uri, '/' || app_uid || '/'))
    return 15; -- User has full access to "his" graph.
  return 8; -- User can list any given graph group.
}
;

SPARQL
define sql:gs-app-callback "TEST"
define sql:gs-app-uid "Anna"
SELECT ?g ?s WHERE { ?s <p> ?o }
;

Sponger Usage Examples

Related