function webfingerInit(cfg) local accounts_set = {} for _, account in ipairs(cfg.accounts) do accounts_set["acct:" .. account] = true end return accounts_set end function webfingerCallback(cfg, accounts_set) local args, err = ngx.req.get_uri_args() if err == "truncated" then return 400, 'uri args too long' end local resource = args['resource'] if accounts_set[resource] then return nil else return 404, "Couldn't find user" end end return { name='WebfingerAllowlist', author='luna@l4.pm', title='Webfinger Allowlist', description=[[ Prevent unnecessary DB load by discarding requests to users that we know won't exist. Useful for small instances. ]], version=1, init=webfingerInit, callbacks = { ['/.well-known/webfinger'] = webfingerCallback }, config={ ['accounts'] = { type='table', value={ type='string', description='ap id' }, description = 'list of account ids (in email@domain form) to pass through to AP' } }, }