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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2004-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%% Description: Cookie handling according to RFC 2109

%% The syntax for the Set-Cookie response header is
%%
%% set-cookie = "Set-Cookie:" cookies
%% cookies = 1#cookie
%% cookie = NAME "=" VALUE *(";" cookie-av)
%% NAME = attr
%% VALUE = value
%% cookie-av = "Comment" "=" value
%% | "Domain" "=" value
%% | "Max-Age" "=" value
%% | "Path" "=" value
%% | "Secure"
%% | "Version" "=" 1*DIGIT


%% application:start(inets).
%% httpc:set_options([{cookies, enabled}, {proxy, {{"www-proxy.ericsson.se",8080}, ["*.ericsson.se"]}}]).
%% (catch httpc:request("http://www.expedia.com")).

-module(httpc_cookie).

-include("httpc_internal.hrl").

-export([open_db/3, close_db/1, insert/2, header/4, cookies/3]).
-export([reset_db/1, which_cookies/1]).
-export([image_of/2, print/2]).

-record(cookie_db, {db, session_db}).


%%%=========================================================================
%%% API
%%%=========================================================================

%%--------------------------------------------------------------------
%% Func: open_db(DbName, DbDir, SessionDbName) -> #cookie_db{}
%% Purpose: Create the cookie db
%%--------------------------------------------------------------------

open_db(_, only_session_cookies, SessionDbName) ->
    ?hcrt("open (session cookies only) db",
[{session_db_name, SessionDbName}]),
    SessionDb = ets:new(SessionDbName,
[protected, bag, {keypos, #http_cookie.domain}]),
    #cookie_db{session_db = SessionDb};

open_db(Name, Dir, SessionDbName) ->
    ?hcrt("open db",
[{name, Name}, {dir, Dir}, {session_db_name, SessionDbName}]),
    File = filename:join(Dir, atom_to_list(Name)),
    case dets:open_file(Name, [{keypos, #http_cookie.domain},
{type, bag},
{file, File},
{ram_file, true}]) of
{ok, Db} ->
SessionDb = ets:new(SessionDbName,
[protected, bag,
{keypos, #http_cookie.domain}]),
#cookie_db{db = Db, session_db = SessionDb};
{error, Reason} ->
throw({error, {failed_open_file, Name, File, Reason}})
    end.


%%--------------------------------------------------------------------
%% Func: reset_db(CookieDb) -> void()
%% Purpose: Reset (empty) the cookie database
%%
%%--------------------------------------------------------------------

reset_db(#cookie_db{db = undefined, session_db = SessionDb}) ->
    ets:delete_all_objects(SessionDb),
    ok;
reset_db(#cookie_db{db = Db, session_db = SessionDb}) ->
    dets:delete_all_objects(Db),
    ets:delete_all_objects(SessionDb),
    ok.


%%--------------------------------------------------------------------
%% Func: close_db(CookieDb) -> ok
%% Purpose: Close the cookie db
%%--------------------------------------------------------------------

close_db(#cookie_db{db = Db, session_db = SessionDb}) ->
    ?hcrt("close db", []),
    maybe_dets_close(Db),
    ets:delete(SessionDb),
    ok.

maybe_dets_close(undefined) ->
    ok;
maybe_dets_close(Db) ->
    dets:close(Db).
    

%%--------------------------------------------------------------------
%% Func: insert(CookieDb) -> ok
%% Purpose: Close the cookie db
%%--------------------------------------------------------------------

%% If no persistent cookie database is defined we
%% treat all cookies as if they where session cookies.
insert(#cookie_db{db = undefined} = CookieDb,
       #http_cookie{max_age = Int} = Cookie) when is_integer(Int) ->
    insert(CookieDb, Cookie#http_cookie{max_age = session});

insert(#cookie_db{session_db = SessionDb} = CookieDb,
       #http_cookie{domain = Key,
name = Name,
path = Path,
max_age = session} = Cookie) ->
    ?hcrt("insert session cookie", [{cookie, Cookie}]),
    Pattern = #http_cookie{domain = Key, name = Name, path = Path, _ = '_'},
    case ets:match_object(SessionDb, Pattern) of
[] ->
ets:insert(SessionDb, Cookie);
[NewCookie] ->
delete(CookieDb, NewCookie),
ets:insert(SessionDb, Cookie)
    end,
    ok;
insert(#cookie_db{db = Db} = CookieDb,
       #http_cookie{domain = Key,
name = Name,
path = Path,
max_age = 0}) ->
    ?hcrt("insert cookie", [{domain, Key}, {name, Name}, {path, Path}]),
    Pattern = #http_cookie{domain = Key, name = Name, path = Path, _ = '_'},
    case dets:match_object(Db, Pattern) of
[] ->
ok;
[NewCookie] ->
delete(CookieDb, NewCookie)
    end,
    ok;
insert(#cookie_db{db = Db} = CookieDb,
       #http_cookie{domain = Key, name = Name, path = Path} = Cookie) ->
    ?hcrt("insert cookie", [{cookie, Cookie}]),
    Pattern = #http_cookie{domain = Key,
name = Name,
path = Path,
_ = '_'},
    case dets:match_object(Db, Pattern) of
[] ->
dets:insert(Db, Cookie);
[OldCookie] ->
delete(CookieDb, OldCookie),
dets:insert(Db, Cookie)
    end,
    ok.



%%--------------------------------------------------------------------
%% Func: header(CookieDb) -> ok
%% Purpose: Cookies
%%--------------------------------------------------------------------

header(CookieDb, Scheme, {Host, _}, Path) ->
    ?hcrd("header", [{scheme, Scheme}, {host, Host}, {path, Path}]),
    case lookup_cookies(CookieDb, Host, Path) of
[] ->
{"cookie", ""};
Cookies ->
%% print_cookies("Header Cookies", Cookies),
{"cookie", cookies_to_string(Scheme, Cookies)}
    end.


%%--------------------------------------------------------------------
%% Func: cookies(Headers, RequestPath, RequestHost) -> [cookie()]
%% Purpose: Which cookies are stored
%%--------------------------------------------------------------------

cookies(Headers, RequestPath, RequestHost) ->

    ?hcrt("cookies", [{headers, Headers},
{request_path, RequestPath},
{request_host, RequestHost}]),

    Cookies = parse_set_cookies(Headers, {RequestPath, RequestHost}),

    %% print_cookies("Parsed Cookies", Cookies),

    AcceptedCookies = accept_cookies(Cookies, RequestPath, RequestHost),

    %% print_cookies("Accepted Cookies", AcceptedCookies),

    AcceptedCookies.


%%--------------------------------------------------------------------
%% Func: which_cookies(CookieDb) -> [cookie()]
%% Purpose: For test and debug purpose,
%% dump the entire cookie database
%%--------------------------------------------------------------------

which_cookies(#cookie_db{db = undefined, session_db = SessionDb}) ->
    SessionCookies = ets:tab2list(SessionDb),
    [{session_cookies, SessionCookies}];
which_cookies(#cookie_db{db = Db, session_db = SessionDb}) ->
    Cookies = dets:match_object(Db, '_'),
    SessionCookies = ets:tab2list(SessionDb),
    [{cookies, Cookies}, {session_cookies, SessionCookies}].


%%%========================================================================
%%% Internal functions
%%%========================================================================

delete(#cookie_db{session_db = SessionDb},
       #http_cookie{max_age = session} = Cookie) ->
    ets:delete_object(SessionDb, Cookie);
delete(#cookie_db{db = Db}, Cookie) ->
    dets:delete_object(Db, Cookie).


lookup_cookies(#cookie_db{db = undefined, session_db = SessionDb}, Key) ->
    Pattern = #http_cookie{domain = Key, _ = '_'},
    Cookies = ets:match_object(SessionDb, Pattern),
    ?hcrt("lookup cookies", [{cookies, Cookies}]),
    Cookies;

lookup_cookies(#cookie_db{db = Db, session_db = SessionDb}, Key) ->
    Pattern = #http_cookie{domain = Key, _ = '_'},
    SessionCookies = ets:match_object(SessionDb, Pattern),
    ?hcrt("lookup cookies", [{session_cookies, SessionCookies}]),
    Cookies = dets:match_object(Db, Pattern),
    ?hcrt("lookup cookies", [{cookies, Cookies}]),
    Cookies ++ SessionCookies.


lookup_cookies(CookieDb, Host, Path) ->
    Cookies =
case http_util:is_hostname(Host) of
true ->
HostCookies = lookup_cookies(CookieDb, Host),
[_| DomainParts] = string:tokens(Host, "."),
lookup_domain_cookies(CookieDb, DomainParts, HostCookies);
false -> % IP-adress
lookup_cookies(CookieDb, Host)
end,
    ValidCookies = valid_cookies(CookieDb, Cookies),
    lists:filter(fun(Cookie) ->
lists:prefix(Cookie#http_cookie.path, Path)
end, ValidCookies).

%% For instance if Host=localhost
lookup_domain_cookies(_CookieDb, [], AccCookies) ->
    lists:flatten(AccCookies);

%% Top domains can not have cookies
lookup_domain_cookies(_CookieDb, [_], AccCookies) ->
    lists:flatten(AccCookies);

lookup_domain_cookies(CookieDb, [Next | DomainParts], AccCookies) ->
    Domain = merge_domain_parts(DomainParts, [Next ++ "."]),
    lookup_domain_cookies(CookieDb, DomainParts,
[lookup_cookies(CookieDb, Domain) | AccCookies]).

merge_domain_parts([Part], Merged) ->
    lists:flatten(["." | lists:reverse([Part | Merged])]);
merge_domain_parts([Part| Rest], Merged) ->
    merge_domain_parts(Rest, [".", Part | Merged]).

cookies_to_string(Scheme, [Cookie | _] = Cookies) ->
    Version = "$Version=" ++ Cookie#http_cookie.version ++ "; ",
    cookies_to_string(Scheme, path_sort(Cookies), [Version]).

cookies_to_string(_, [], CookieStrs) ->
    case length(CookieStrs) of
1 ->
"";
_ ->
lists:flatten(lists:reverse(CookieStrs))
    end;

cookies_to_string(https = Scheme,
[#http_cookie{secure = true} = Cookie| Cookies],
CookieStrs) ->
    Str = case Cookies of
[] ->
cookie_to_string(Cookie);
_ ->
cookie_to_string(Cookie) ++ "; "
end,
    cookies_to_string(Scheme, Cookies, [Str | CookieStrs]);

cookies_to_string(Scheme, [#http_cookie{secure = true}| Cookies],
CookieStrs) ->
    cookies_to_string(Scheme, Cookies, CookieStrs);

cookies_to_string(Scheme, [Cookie | Cookies], CookieStrs) ->
    Str = case Cookies of
[] ->
cookie_to_string(Cookie);
_ ->
cookie_to_string(Cookie) ++ "; "
end,
    cookies_to_string(Scheme, Cookies, [Str | CookieStrs]).

cookie_to_string(#http_cookie{name = Name, value = Value} = Cookie) ->
    Str = Name ++ "=" ++ Value,
    add_domain(add_path(Str, Cookie), Cookie).
    
add_path(Str, #http_cookie{path_default = true}) ->
    Str;
add_path(Str, #http_cookie{path = Path}) ->
    Str ++ "; $Path=" ++ Path.

add_domain(Str, #http_cookie{domain_default = true}) ->
    Str;
add_domain(Str, #http_cookie{domain = Domain}) ->
    Str ++ "; $Domain=" ++ Domain.

parse_set_cookies(CookieHeaders, DefaultPathDomain) ->
    SetCookieHeaders = [Value || {"set-cookie", Value} <- CookieHeaders],
    Cookies = [parse_set_cookie(SetCookieHeader, DefaultPathDomain) ||
SetCookieHeader <- SetCookieHeaders],
    %% print_cookies("Parsed Cookies", Cookies),
    Cookies.

parse_set_cookie(CookieHeader, {DefaultPath, DefaultDomain}) ->
    %% io:format("Raw Cookie: ~s~n", [CookieHeader]),
    Pos = string:chr(CookieHeader, $=),
    Name = string:substr(CookieHeader, 1, Pos - 1),
    {Value, Attrs} =
case string:substr(CookieHeader, Pos + 1) of
[$;|ValueAndAttrs] ->
{"", string:tokens(ValueAndAttrs, ";")};
ValueAndAttrs ->
[V | A] = string:tokens(ValueAndAttrs, ";"),
{V, A}
end,
    Cookie = #http_cookie{name = string:strip(Name),
value = string:strip(Value)},
    Attributes = parse_set_cookie_attributes(Attrs),
    TmpCookie = cookie_attributes(Attributes, Cookie),
    %% Add runtime defult values if necessary
    NewCookie = domain_default(path_default(TmpCookie, DefaultPath),
DefaultDomain),
    NewCookie.
    
parse_set_cookie_attributes(Attributes) when is_list(Attributes) ->
    [parse_set_cookie_attribute(A) || A <- Attributes].

parse_set_cookie_attribute(Attribute) ->
    {AName, AValue} =
case string:tokens(Attribute, "=") of
%% All attributes have the form
%% Name=Value except "secure"!
[Name] ->
{Name, ""};
[Name, Value] ->
{Name, Value};
%% Anything not expected will be
%% disregarded
_ ->
{"Dummy", ""}
end,
    StrippedName = http_util:to_lower(string:strip(AName)),
    StrippedValue = string:strip(AValue),
    {StrippedName, StrippedValue}.

cookie_attributes([], Cookie) ->
    Cookie;
cookie_attributes([{"comment", Value}| Attributes], Cookie) ->
    cookie_attributes(Attributes,
Cookie#http_cookie{comment = Value});
cookie_attributes([{"domain", Value}| Attributes], Cookie) ->
    cookie_attributes(Attributes,
Cookie#http_cookie{domain = Value});
cookie_attributes([{"max-age", Value}| Attributes], Cookie) ->
    ExpireTime = cookie_expires(list_to_integer(Value)),
    cookie_attributes(Attributes,
Cookie#http_cookie{max_age = ExpireTime});
%% Backwards compatibility with netscape cookies
cookie_attributes([{"expires", Value}| Attributes], Cookie) ->
    try http_util:convert_netscapecookie_date(Value) of
Time ->
ExpireTime = calendar:datetime_to_gregorian_seconds(Time),
cookie_attributes(Attributes,
Cookie#http_cookie{max_age = ExpireTime})
    catch
_:_ ->
cookie_attributes(Attributes, Cookie)
    end;
cookie_attributes([{"path", Value}| Attributes], Cookie) ->
    cookie_attributes(Attributes,
Cookie#http_cookie{path = Value});
cookie_attributes([{"secure", _}| Attributes], Cookie) ->
    cookie_attributes(Attributes,
Cookie#http_cookie{secure = true});
cookie_attributes([{"version", Value}| Attributes], Cookie) ->
    cookie_attributes(Attributes,
Cookie#http_cookie{version = Value});
%% Disregard unknown attributes.
cookie_attributes([_| Attributes], Cookie) ->
    cookie_attributes(Attributes, Cookie).
   
domain_default(Cookie = #http_cookie{domain = undefined},
DefaultDomain) ->
    Cookie#http_cookie{domain = DefaultDomain, domain_default = true};
domain_default(Cookie, _) ->
    Cookie.

path_default(#http_cookie{path = undefined} = Cookie, DefaultPath) ->
    Cookie#http_cookie{path = skip_right_most_slash(DefaultPath),
path_default = true};
path_default(Cookie, _) ->
    Cookie.

%% Note: if the path is only / that / will be kept
skip_right_most_slash("/") ->
    "/";
skip_right_most_slash(Str) ->
    string:strip(Str, right, $/).

accept_cookies(Cookies, RequestPath, RequestHost) ->
    lists:filter(fun(Cookie) ->
accept_cookie(Cookie, RequestPath, RequestHost)
end, Cookies).

accept_cookie(Cookie, RequestPath, RequestHost) ->
    Accepted =
accept_path(Cookie, RequestPath) andalso
accept_domain(Cookie, RequestHost),
    Accepted.

accept_path(#http_cookie{path = Path}, RequestPath) ->
    lists:prefix(Path, RequestPath).

accept_domain(#http_cookie{domain = RequestHost}, RequestHost) ->
    true;

accept_domain(#http_cookie{domain = Domain}, RequestHost) ->
    HostCheck =
case http_util:is_hostname(RequestHost) of
true ->
(lists:suffix(Domain, RequestHost) andalso
(not
lists:member($.,
string:substr(RequestHost, 1,
(length(RequestHost) -
length(Domain))))));
false ->
false
end,
    HostCheck
andalso (hd(Domain) =:= $.)
andalso (length(string:tokens(Domain, ".")) > 1).

cookie_expires(0) ->
    0;
cookie_expires(DeltaSec) ->
    NowSec = calendar:datetime_to_gregorian_seconds({date(), time()}),
    NowSec + DeltaSec.

is_cookie_expired(#http_cookie{max_age = session}) ->
    false;
is_cookie_expired(#http_cookie{max_age = ExpireTime}) ->
    NowSec = calendar:datetime_to_gregorian_seconds({date(), time()}),
    ExpireTime - NowSec =< 0.


valid_cookies(Db, Cookies) ->
    valid_cookies(Db, Cookies, []).

valid_cookies(_Db, [], Valid) ->
    Valid;

valid_cookies(Db, [Cookie | Cookies], Valid) ->
    case is_cookie_expired(Cookie) of
true ->
delete(Db, Cookie),
valid_cookies(Db, Cookies, Valid);
false ->
valid_cookies(Db, Cookies, [Cookie | Valid])
    end.
    
path_sort(Cookies)->
    lists:reverse(lists:keysort(#http_cookie.path, Cookies)).


%% print_cookies(Header, Cookies) ->
%% io:format("~s:~n", [Header]),
%% Prefix = " ",
%% lists:foreach(fun(Cookie) -> print(Prefix, Cookie) end, Cookies).

image_of(Prefix,
#http_cookie{domain = Domain,
domain_default = DomainDef,
name = Name,
value = Value,
comment = Comment,
max_age = MaxAge,
path = Path,
path_default = PathDef,
secure = Sec,
version = Version}) ->
    lists:flatten(
      io_lib:format("~sCookie ~s: "
"~n~s Value: ~p"
"~n~s Domain: ~p"
"~n~s DomainDef: ~p"
"~n~s Comment: ~p"
"~n~s MaxAge: ~p"
"~n~s Path: ~p"
"~n~s PathDef: ~p"
"~n~s Secure: ~p"
"~n~s Version: ~p",
[Prefix, Name,
Prefix, Value,
Prefix, Domain,
Prefix, DomainDef,
Prefix, Comment,
Prefix, MaxAge,
Prefix, Path,
Prefix, PathDef,
Prefix, Sec,
Prefix, Version])).

print(Prefix, Cookie) when is_record(Cookie, http_cookie) ->
    io:format("~s~n", [image_of(Prefix, Cookie)]).
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