sister_oauth.erl

sign(Req, Auth) ->
    Params = Req#req.params,
    Method = Req#req.method,
    Url    = Req#req.url,
    {H, P} = oauth_params(Params, Auth),
    Sig    = signature(Method, Url, P, Auth),
    IoList = ["OAuth ",
              "oauth_signature", $=, Sig
              |H],
    Req#req{headers = [{"Authorization", iolist_to_string(IoList)}
                       | Req#req.headers]}.