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

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--
-- Public geocoder 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 <%= GEOCODER_CLIENT_SCHEMA %>.<%= name %> (<%= params_with_type %>)
RETURNS <%= return_type %> AS $$
DECLARE
ret <%= return_type %>;
username text;
BEGIN
IF session_user = 'publicuser' OR session_user ~ 'cartodb_publicuser_*' THEN
RAISE EXCEPTION 'The api_key must be provided';
END IF;
SELECT _CDB_username() INTO username;
SELECT <%= GEOCODER_CLIENT_SCHEMA %>._<%= name %>(username, <%= params %>) INTO ret;
RETURN ret;
END;
$$ LANGUAGE 'plpgsql' SECURITY DEFINER;