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mod_http_oauth2: Implement refresh token rotation Makes refresh tokens one-time-use, handing out a new refresh token with each access token. Thus if a refresh token is stolen and used by an attacker, the next time the legitimate client tries to use the previous refresh token, it will not work and the attack will be noticed. If the attacker does not use the refresh token, it becomes invalid after the legitimate client uses it. This behavior is recommended by draft-ietf-oauth-security-topics

local array = require "util.array";

module:add_item("openid-claim", "groups");

local group_memberships = module:open_store("groups", "map");
local function user_groups(username)
	return pairs(group_memberships:get_all(username) or {});
end

module:hook("token/userinfo", function(event)
	local userinfo = event.userinfo;
	if event.claims:contains("groups") then
		userinfo.groups = array(user_groups(event.username));
	end
end);