dataservices-api/client/renderer/templates/20_public_functions.erb

--
-- Public dataservices API function
--
-- These are the only ones with permissions to publicuser role
-- and should also be the only ones with SECURITY DEFINER

CREATE OR REPLACE FUNCTION <%= DATASERVICES_CLIENT_SCHEMA %>.<%= name %> (<%= params_with_type_and_default.join(' ,') %>)
RETURNS <%= return_type %> AS $$
DECLARE
  <%= return_declaration if not multi_row %>
  <%= user_org_declaration %>
BEGIN
  IF session_user = 'publicuser' OR session_user ~ 'cartodb_publicuser_*' THEN
    RAISE EXCEPTION 'The api_key must be provided';
  END IF;
  <% unless superuser_function? -%>SELECT u, o INTO username, orgname FROM <%= DATASERVICES_CLIENT_SCHEMA %>._cdb_entity_config() AS (u text, o text);<% end %>
  -- JSON value stored "" is taken as literal
  IF username IS NULL OR username = '' OR username = '""' THEN
    RAISE EXCEPTION 'Username is a mandatory argument, check it out';
  END IF;

  <% return_statement do %><%= DATASERVICES_CLIENT_SCHEMA %>._<%= name %>(<%= params(_with_user_org=true).join(', ') %>)<% end %>
END;
$$ LANGUAGE 'plpgsql' SECURITY DEFINER;