%% Copyright (c) 2013-2015, Loïc Hoguin <[email protected]>
%%
%% Permission to use, copy, modify, and/or distribute this software for any
%% purpose with or without fee is hereby granted, provided that the above
%% copyright notice and this permission notice appear in all copies.
%%
%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-module(cow_cookie).
-export([parse_cookie/1]).
-export([setcookie/3]).
-type cookie_option() :: {max_age, non_neg_integer()}
| {domain, binary()} | {path, binary()}
| {secure, boolean()} | {http_only, boolean()}.
-type cookie_opts() :: [cookie_option()].
-export_type([cookie_opts/0]).
%% @doc Parse a cookie header string and return a list of key/values.
-spec parse_cookie(binary()) -> [{binary(), binary()}].
parse_cookie(Cookie) ->
parse_cookie(Cookie, []).
parse_cookie(<<>>, Acc) ->
lists:reverse(Acc);
parse_cookie(<< $\s, Rest/binary >>, Acc) ->
parse_cookie(Rest, Acc);
parse_cookie(<< $\t, Rest/binary >>, Acc) ->
parse_cookie(Rest, Acc);
parse_cookie(<< $,, Rest/binary >>, Acc) ->
parse_cookie(Rest, Acc);
parse_cookie(<< $;, Rest/binary >>, Acc) ->
parse_cookie(Rest, Acc);
parse_cookie(<< $$, Rest/binary >>, Acc) ->
skip_cookie(Rest, Acc);
parse_cookie(Cookie, Acc) ->
parse_cookie_name(Cookie, Acc, <<>>).
skip_cookie(<<>>, Acc) ->
lists:reverse(Acc);
skip_cookie(<< $,, Rest/binary >>, Acc) ->
parse_cookie(Rest, Acc);
skip_cookie(<< $;, Rest/binary >>, Acc) ->
parse_cookie(Rest, Acc);
skip_cookie(<< _, Rest/binary >>, Acc) ->
skip_cookie(Rest, Acc).
parse_cookie_name(<<>>, Acc, Name) ->
lists:reverse([{Name, <<>>}|Acc]);
parse_cookie_name(<< $=, _/binary >>, _, <<>>) ->
error(badarg);
parse_cookie_name(<< $=, Rest/binary >>, Acc, Name) ->
parse_cookie_value(Rest, Acc, Name, <<>>);
parse_cookie_name(<< $,, _/binary >>, _, _) ->
error(badarg);
parse_cookie_name(<< $;, Rest/binary >>, Acc, Name) ->
parse_cookie(Rest, [{Name, <<>>}|Acc]);
parse_cookie_name(<< $\s, _/binary >>, _, _) ->
error(badarg);
parse_cookie_name(<< $\t, _/binary >>, _, _) ->
error(badarg);
parse_cookie_name(<< $\r, _/binary >>, _, _) ->
error(badarg);
parse_cookie_name(<< $\n, _/binary >>, _, _) ->
error(badarg);
parse_cookie_name(<< $\013, _/binary >>, _, _) ->
error(badarg);
parse_cookie_name(<< $\014, _/binary >>, _, _) ->
error(badarg);
parse_cookie_name(<< C, Rest/binary >>, Acc, Name) ->
parse_cookie_name(Rest, Acc, << Name/binary, C >>).
parse_cookie_value(<<>>, Acc, Name, Value) ->
lists:reverse([{Name, parse_cookie_trim(Value)}|Acc]);
parse_cookie_value(<< $;, Rest/binary >>, Acc, Name, Value) ->
parse_cookie(Rest, [{Name, parse_cookie_trim(Value)}|Acc]);
parse_cookie_value(<< $\t, _/binary >>, _, _, _) ->
error(badarg);
parse_cookie_value(<< $\r, _/binary >>, _, _, _) ->
error(badarg);
parse_cookie_value(<< $\n, _/binary >>, _, _, _) ->
error(badarg);
parse_cookie_value(<< $\013, _/binary >>, _, _, _) ->
error(badarg);
parse_cookie_value(<< $\014, _/binary >>, _, _, _) ->
error(badarg);
parse_cookie_value(<< C, Rest/binary >>, Acc, Name, Value) ->
parse_cookie_value(Rest, Acc, Name, << Value/binary, C >>).
parse_cookie_trim(Value = <<>>) ->
Value;
parse_cookie_trim(Value) ->
case binary:last(Value) of
$\s ->
Size = byte_size(Value) - 1,
<< Value2:Size/binary, _ >> = Value,
parse_cookie_trim(Value2);
_ ->
Value
end.
-ifdef(TEST).
parse_cookie_test_() ->
%% {Value, Result}.
Tests = [
{<<"name=value; name2=value2">>, [
{<<"name">>, <<"value">>},
{<<"name2">>, <<"value2">>}
]},
{<<"$Version=1; Customer=WILE_E_COYOTE; $Path=/acme">>, [
{<<"Customer">>, <<"WILE_E_COYOTE">>}
]},
{<<"$Version=1; Customer=WILE_E_COYOTE; $Path=/acme; "
"Part_Number=Rocket_Launcher_0001; $Path=/acme; "
"Shipping=FedEx; $Path=/acme">>, [
{<<"Customer">>, <<"WILE_E_COYOTE">>},
{<<"Part_Number">>, <<"Rocket_Launcher_0001">>},
{<<"Shipping">>, <<"FedEx">>}
]},
%% Space in value.
{<<"foo=Thu Jul 11 2013 15:38:43 GMT+0400 (MSK)">>,
[{<<"foo">>, <<"Thu Jul 11 2013 15:38:43 GMT+0400 (MSK)">>}]},
%% Comma in value. Google Analytics sets that kind of cookies.
{<<"refk=sOUZDzq2w2; sk=B602064E0139D842D620C7569640DBB4C81C45080651"
"9CC124EF794863E10E80; __utma=64249653.825741573.1380181332.1400"
"015657.1400019557.703; __utmb=64249653.1.10.1400019557; __utmc="
"64249653; __utmz=64249653.1400019557.703.13.utmcsr=bluesky.chic"
"agotribune.com|utmccn=(referral)|utmcmd=referral|utmcct=/origin"
"als/chi-12-indispensable-digital-tools-bsi,0,0.storygallery">>, [
{<<"refk">>, <<"sOUZDzq2w2">>},
{<<"sk">>, <<"B602064E0139D842D620C7569640DBB4C81C45080651"
"9CC124EF794863E10E80">>},
{<<"__utma">>, <<"64249653.825741573.1380181332.1400"
"015657.1400019557.703">>},
{<<"__utmb">>, <<"64249653.1.10.1400019557">>},
{<<"__utmc">>, <<"64249653">>},
{<<"__utmz">>, <<"64249653.1400019557.703.13.utmcsr=bluesky.chic"
"agotribune.com|utmccn=(referral)|utmcmd=referral|utmcct=/origin"
"als/chi-12-indispensable-digital-tools-bsi,0,0.storygallery">>}
]},
%% Potential edge cases (initially from Mochiweb).
{<<"foo=\\x">>, [{<<"foo">>, <<"\\x">>}]},
{<<"foo=;bar=">>, [{<<"foo">>, <<>>}, {<<"bar">>, <<>>}]},
{<<"foo=\\\";;bar=good ">>,
[{<<"foo">>, <<"\\\"">>}, {<<"bar">>, <<"good">>}]},
{<<"foo=\"\\\";bar=good">>,
[{<<"foo">>, <<"\"\\\"">>}, {<<"bar">>, <<"good">>}]},
{<<>>, []}, %% Flash player.
{<<"foo=bar , baz=wibble ">>, [{<<"foo">>, <<"bar , baz=wibble">>}]},
%% Technically invalid, but seen in the wild
{<<"foo">>, [{<<"foo">>, <<>>}]},
{<<"foo;">>, [{<<"foo">>, <<>>}]},
{<<"bar;foo=1">>, [{<<"bar">>, <<"">>}, {<<"foo">>, <<"1">>}]}
],
[{V, fun() -> R = parse_cookie(V) end} || {V, R} <- Tests].
parse_cookie_error_test_() ->
%% Value.
Tests = [
<<"=">>,
<<"foo ">>
],
[{V, fun() -> {'EXIT', {badarg, _}} = (catch parse_cookie(V)) end} || V <- Tests].
-endif.
%% @doc Convert a cookie name, value and options to its iodata form.
%% @end
%%
%% Initially from Mochiweb:
%% * Copyright 2007 Mochi Media, Inc.
%% Initial binary implementation:
%% * Copyright 2011 Thomas Burdick <[email protected]>
-spec setcookie(iodata(), iodata(), cookie_opts()) -> iodata().
setcookie(Name, Value, Opts) ->
nomatch = binary:match(iolist_to_binary(Name), [<<$=>>, <<$,>>, <<$;>>,
<<$\s>>, <<$\t>>, <<$\r>>, <<$\n>>, <<$\013>>, <<$\014>>]),
nomatch = binary:match(iolist_to_binary(Value), [<<$,>>, <<$;>>,
<<$\s>>, <<$\t>>, <<$\r>>, <<$\n>>, <<$\013>>, <<$\014>>]),
MaxAgeBin = case lists:keyfind(max_age, 1, Opts) of
false -> <<>>;
{_, 0} ->
%% MSIE requires an Expires date in the past to delete a cookie.
<<"; Expires=Thu, 01-Jan-1970 00:00:01 GMT; Max-Age=0">>;
{_, MaxAge} when is_integer(MaxAge), MaxAge > 0 ->
UTC = calendar:universal_time(),
Secs = calendar:datetime_to_gregorian_seconds(UTC),
Expires = calendar:gregorian_seconds_to_datetime(Secs + MaxAge),
[<<"; Expires=">>, cow_date:rfc2109(Expires),
<<"; Max-Age=">>, integer_to_list(MaxAge)]
end,
DomainBin = case lists:keyfind(domain, 1, Opts) of
false -> <<>>;
{_, Domain} -> [<<"; Domain=">>, Domain]
end,
PathBin = case lists:keyfind(path, 1, Opts) of
false -> <<>>;
{_, Path} -> [<<"; Path=">>, Path]
end,
SecureBin = case lists:keyfind(secure, 1, Opts) of
false -> <<>>;
{_, false} -> <<>>;
{_, true} -> <<"; Secure">>
end,
HttpOnlyBin = case lists:keyfind(http_only, 1, Opts) of
false -> <<>>;
{_, false} -> <<>>;
{_, true} -> <<"; HttpOnly">>
end,
[Name, <<"=">>, Value, <<"; Version=1">>,
MaxAgeBin, DomainBin, PathBin, SecureBin, HttpOnlyBin].
-ifdef(TEST).
setcookie_test_() ->
%% {Name, Value, Opts, Result}
Tests = [
{<<"Customer">>, <<"WILE_E_COYOTE">>,
[{http_only, true}, {domain, <<"acme.com">>}],
<<"Customer=WILE_E_COYOTE; Version=1; "
"Domain=acme.com; HttpOnly">>},
{<<"Customer">>, <<"WILE_E_COYOTE">>,
[{path, <<"/acme">>}],
<<"Customer=WILE_E_COYOTE; Version=1; Path=/acme">>},
{<<"Customer">>, <<"WILE_E_COYOTE">>,
[{secure, true}],
<<"Customer=WILE_E_COYOTE; Version=1; Secure">>},
{<<"Customer">>, <<"WILE_E_COYOTE">>,
[{secure, false}, {http_only, false}],
<<"Customer=WILE_E_COYOTE; Version=1">>},
{<<"Customer">>, <<"WILE_E_COYOTE">>,
[{path, <<"/acme">>}, {badoption, <<"negatory">>}],
<<"Customer=WILE_E_COYOTE; Version=1; Path=/acme">>}
],
[{R, fun() -> R = iolist_to_binary(setcookie(N, V, O)) end}
|| {N, V, O, R} <- Tests].
setcookie_max_age_test() ->
F = fun(N, V, O) ->
binary:split(iolist_to_binary(
setcookie(N, V, O)), <<";">>, [global])
end,
[<<"Customer=WILE_E_COYOTE">>,
<<" Version=1">>,
<<" Expires=", _/binary>>,
<<" Max-Age=111">>,
<<" Secure">>] = F(<<"Customer">>, <<"WILE_E_COYOTE">>,
[{max_age, 111}, {secure, true}]),
case catch F(<<"Customer">>, <<"WILE_E_COYOTE">>, [{max_age, -111}]) of
{'EXIT', {{case_clause, {max_age, -111}}, _}} -> ok
end,
[<<"Customer=WILE_E_COYOTE">>,
<<" Version=1">>,
<<" Expires=", _/binary>>,
<<" Max-Age=86417">>] = F(<<"Customer">>, <<"WILE_E_COYOTE">>,
[{max_age, 86417}]),
ok.
setcookie_failures_test_() ->
F = fun(N, V) ->
try setcookie(N, V, []) of
_ ->
false
catch _:_ ->
true
end
end,
Tests = [
{<<"Na=me">>, <<"Value">>},
{<<"Name;">>, <<"Value">>},
{<<"\r\name">>, <<"Value">>},
{<<"Name">>, <<"Value;">>},
{<<"Name">>, <<"\value">>}
],
[{iolist_to_binary(io_lib:format("{~p, ~p} failure", [N, V])),
fun() -> true = F(N, V) end}
|| {N, V} <- Tests].
-endif.
