haproxy pem formatted ssl client cert fetch - ssl_c_pem - like ssl_c_der

ssl_c_pem.lua

require("base64")

core.register_fetches("ssl_c_pem", function(txn)
	local der = txn.f:ssl_c_der()

	local wrap = ('.'):rep(64);
	local envelope = "-----BEGIN %s-----\n%s\n-----END %s-----\n"
	local typ = "CERTIFICATE";
	der = base64.encode(data);
	return string.format(envelope, typ, der:gsub(wrap, '%0\n', (#der-1)/64), typ);
end)

For folks finding this many years later, here is a working example

nice, thank you very much! Can't even remember which haproxy version we used back then :)