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%% @copyright 2011 Hunter Morris.
%% @doc Implementation of `gen_server' behaviour.
%% @end
%% Distributed under the MIT license; see LICENSE for details.
-module(bcrypt_nif_worker).
-author('Hunter Morris <huntermorris@gmail.com>').
-behaviour(gen_server).
-export([start_link/1]).
-export([gen_salt/0, gen_salt/1]).
-export([hashpw/2]).
%% gen_server
-export([init/1, code_change/3, terminate/2,
handle_call/3, handle_cast/2, handle_info/2]).
-record(state, {
default_log_rounds :: integer(),
context :: term()
}).
-type state() :: #state{default_log_rounds :: integer(), context :: term()}.
%% @doc Creates a `gen_server' process as part of a supervision tree.
-spec start_link(Args) -> Result when
Args :: term(),
Result :: {ok,Pid} | ignore | {error,Error},
Pid :: pid(),
Error :: {already_started,Pid} | term().
start_link(Args) -> gen_server:start_link(?MODULE, Args, []).
%% @doc Returns bcrypt salt.
-spec gen_salt() -> Result when
Result :: [byte()].
gen_salt() ->
poolboy:transaction(bcrypt_nif_pool, fun(Worker) ->
gen_server:call(Worker, gen_salt, infinity)
end).
%% @doc Returns bcrypt salt.
-spec gen_salt(Rounds) -> Result when
Rounds :: bcrypt:rounds(),
Result :: [byte()].
gen_salt(Rounds) ->
poolboy:transaction(bcrypt_nif_pool, fun(Worker) ->
gen_server:call(Worker, {gen_salt, Rounds}, infinity)
end).
%% @doc Make hash string based on `Password' and `Salt'.
-spec hashpw( Password, Salt ) -> Result when
Password :: [byte()] | binary(),
Salt :: [byte()] | binary(),
Result :: {ok, Hash} | {error, ErrorDescription},
Hash :: [byte()],
ErrorDescription :: bcrypt:pwerr().
hashpw(Password, Salt) ->
poolboy:transaction(bcrypt_nif_pool, fun(Worker) ->
gen_server:call(Worker, {hashpw, Password, Salt}, infinity)
end).
%% @private
-spec init(Args) -> Result when
Args :: list(),
Result :: {ok, state()}.
init([]) ->
process_flag(trap_exit, true),
{ok, Default} = application:get_env(bcrypt, default_log_rounds),
Ctx = bcrypt_nif:create_ctx(),
{ok, #state{default_log_rounds = Default, context = Ctx}}.
%% @private
terminate(shutdown, _) -> ok.
%% @private
-spec handle_call(Request, From, State) -> Result when
Request :: gen_salt,
From :: {pid(), atom()},
State :: state(),
Result :: {reply, Reply, State},
Reply :: {ok, Salt},
Salt :: integer();
(Request, From, State) -> Result when
Request :: {gen_salt, Rounds},
From :: {pid(), atom()},
State :: state(),
Rounds :: bcrypt:rounds(),
Result :: {reply, Reply, State},
Reply :: {ok, Salt},
Salt :: integer();
(Request, From, State) -> Result when
Request :: {hashpw, Password, Salt},
From :: {pid(), atom()},
State :: state(),
Password :: [byte()],
Salt :: integer(),
Result :: {reply, Reply, State} | {reply, Reply, State},
Reply :: {ok, ResultInfo} | {error, ResultInfo},
ResultInfo :: term().
handle_call(gen_salt, _From, #state{default_log_rounds = R} = State) ->
Salt = bcrypt_nif:gen_salt(R),
{reply, {ok, Salt}, State};
handle_call({gen_salt, R}, _From, State) ->
Salt = bcrypt_nif:gen_salt(R),
{reply, {ok, Salt}, State};
handle_call({hashpw, Password, Salt}, _From, #state{context=Ctx}=State) ->
Ref = make_ref(),
ok = bcrypt_nif:hashpw(Ctx, Ref, self(), to_list(Password), to_list(Salt)),
receive
{ok, Ref, Result} ->
{reply, {ok, Result}, State};
{error, Ref, Result} ->
{reply, {error, Result}, State}
end;
handle_call(Msg, _, _) -> exit({unknown_call, Msg}).
%% @private
handle_cast(Msg, _) -> exit({unknown_cast, Msg}).
%% @private
handle_info(Msg, _) -> exit({unknown_info, Msg}).
%% @private
code_change(_OldVsn, State, _Extra) -> {ok, State}.
-spec to_list(List) -> Result when
List :: [byte()],
Result :: [byte()];
(Binary) -> Result when
Binary :: binary(),
Result :: [byte()].
to_list(L) when is_list(L) -> L;
to_list(B) when is_binary(B) -> binary_to_list(B).
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