/
yaws.erl
1516 lines (1209 loc) · 34.1 KB
/
yaws.erl
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%%%----------------------------------------------------------------------
%%% File : yaws.erl
%%% Author : Claes Wikstrom <klacke@bluetail.com>
%%% Purpose :
%%% Created : 16 Jan 2002 by Claes Wikstrom <klacke@bluetail.com>
%%%----------------------------------------------------------------------
-module(yaws).
-author('klacke@bluetail.com').
-include_lib("yaws/include/yaws.hrl").
-include_lib("yaws/include/yaws_api.hrl").
-include("yaws_debug.hrl").
-include_lib("kernel/include/file.hrl").
-compile(export_all).
-import(lists, [reverse/1, reverse/2]).
%%-export([Function/Arity, ...]).
start() ->
application:start(yaws, permanent).
stop() ->
application:stop(yaws).
hup(Sock) ->
spawn(fun() ->
group_leader(whereis(user), self()),
dohup(Sock)
end).
dohup(Sock) ->
io:format("in dohup~n", []),
{Debug, Trace, TraceOut, Conf, _RunMod, _Embed} =
yaws_server:get_app_args(),
Res = (catch case yaws_config:load(Conf, Trace, TraceOut, Debug) of
{ok, Gconf, Sconfs} ->
yaws_api:setconf(Gconf, Sconfs);
Err ->
Err
end),
gen_tcp:send(Sock, io_lib:format("hupped: ~p~n", [Res])),
gen_tcp:close(Sock).
%% use from cli only
restart() ->
stop(),
load(),
start().
modules() ->
application:load(yaws),
M = case application:get_all_key(yaws) of
{ok, L} ->
case lists:keysearch(modules, 1, L) of
{value, {modules, Mods}} ->
Mods;
_ ->
[]
end;
_ ->
[]
end,
M.
load() ->
load(modules()).
load(M) ->
lists:foreach(fun(Mod) ->
?Debug("Load ~p~n", [Mod]),
c:l(Mod)
end, M).
%%% misc funcs
first(_F, []) ->
false;
first(F, [H|T]) ->
case F(H) of
{ok, Val} ->
{ok, Val, H};
ok ->
{ok, ok, H};
_ ->
first(F, T)
end.
elog(F, As) ->
error_logger:format(F, As).
filesize(Fname) ->
case file:read_file_info(Fname) of
{ok, FI} when FI#file_info.type == regular ->
{ok, FI#file_info.size};
{ok, FI} ->
{error, FI#file_info.type};
Err ->
Err
end.
%%
upto(0, []) ->
[];
upto(_I, []) ->
[];
upto(0, _) ->
" ....";
upto(_I, [0|_]) ->
" ....";
upto(I,[H|T]) ->
[H|upto(I-1, T)].
zip([H1|T1], [H2|T2]) ->
[{H1, H2} |zip(T1, T2)];
zip([], []) ->
[].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Date and Time functions
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
date_and_time() ->
case catch erlang:now() of
{'EXIT', _} -> % We don't have info about UTC
short_time(calendar:local_time());
Now ->
UTC = calendar:now_to_universal_time(Now),
Local = calendar:universal_time_to_local_time(UTC),
date_and_time(Local, UTC)
end.
date_and_time(Local, UTC) ->
DiffSecs = calendar:datetime_to_gregorian_seconds(Local) -
calendar:datetime_to_gregorian_seconds(UTC),
short_time(Local) ++ diff(DiffSecs).
%% short_time
short_time({{Y,M,D},{H,Mi,S}}) ->
[y1(Y), y2(Y), M, D, H, Mi, S].
%% Format date according to ISO 8601
date_and_time_to_string(DAT) ->
case validate_date_and_time(DAT) of
true ->
dat2str(DAT);
false ->
exit({badarg, {?MODULE, date_and_time_to_string, [DAT]}})
end.
universal_time_to_string(UTC) ->
Local = calendar:universal_time_to_local_time(UTC),
DT = local_time_to_date_and_time(Local),
date_and_time_to_string(DT).
dat2str([Y1,Y2, Mo, D, H, M, S | Diff]) ->
lists:flatten(
io_lib:format("~s ~w-~2.2.0w-~2.2.0w,~2.2.0w:~2.2.0w:~2.2.0w",
[weekday(Y1,Y2,Mo,D), y(Y1,Y2),Mo,D,H,M,S]) ++
case Diff of
[Sign,Hd,Md] ->
io_lib:format("~c~2.2.0w~2.2.0w",
[Sign,Hd,Md]);
_ -> []
end).
weekday(Y1,Y2,Mo,D) ->
int_to_wd(calendar:day_of_the_week(Y1*256+Y2,Mo,D)).
int_to_wd(1) ->
"Mon";
int_to_wd(2) ->
"Tue";
int_to_wd(3) ->
"Wed";
int_to_wd(4) ->
"Thu";
int_to_wd(5) ->
"Fri";
int_to_wd(6) ->
"Sat";
int_to_wd(7) ->
"Sun".
y1(Y) -> (Y bsr 8) band 255.
y2(Y) -> Y band 255.
y(Y1, Y2) -> 256 * Y1 + Y2.
diff(Secs) ->
case calendar:seconds_to_daystime(Secs) of
{0, {H, M,_}} ->
[$+, H, M];
{-1, _} ->
{0, {H, M, _}} = calendar:seconds_to_daystime(-Secs),
[$-, H, M]
end.
universal_time_to_date_and_time(UTC) ->
short_time(UTC) ++ [$+, 0, 0].
local_time_to_date_and_time(Local) ->
UTC = calendar:local_time_to_universal_time(Local),
date_and_time(Local, UTC).
date_and_time_to_universal_time([Y1,Y2, Mo, D, H, M, S]) ->
%% Local time specified, convert to UTC
Local = {{y(Y1,Y2), Mo, D}, {H, M, S}},
calendar:local_time_to_universal_time(Local);
date_and_time_to_universal_time([Y1,Y2, Mo, D, H, M, S, Sign, Hd, Md]) ->
%% Time specified as local time + diff from UTC. Conv to UTC.
Local = {{y(Y1,Y2), Mo, D}, {H, M, S}},
LocalSecs = calendar:datetime_to_gregorian_seconds(Local),
Diff = (Hd*60 + Md)*60,
UTCSecs = if Sign == $+ -> LocalSecs - Diff;
Sign == $- -> LocalSecs + Diff
end,
calendar:gregorian_seconds_to_datetime(UTCSecs).
validate_date_and_time([Y1,Y2, Mo, D, H, M, S | Diff])
when 0 =< Y1, 0 =< Y2, 0 < Mo, Mo < 13, 0 < D, D < 32, 0 =< H,
H < 24, 0 =< M, M < 60, 0 =< S, S < 61 ->
case check_diff(Diff) of
true ->
calendar:valid_date(y(Y1,Y2), Mo, D);
false ->
false
end;
validate_date_and_time(_) -> false.
check_diff([]) -> true;
check_diff([$+, H, M]) when 0 =< H, H < 24, 0 =< M, M < 60 -> true;
check_diff([$-, H, M]) when 0 =< H, H < 24, 0 =< M, M < 60 -> true;
check_diff(_) -> false.
%% to_string
to_string(X) when float(X) ->
io_lib:format("~.2.0f",[X]);
to_string(X) when integer(X) ->
integer_to_list(X);
to_string(X) when atom(X) ->
atom_to_list(X);
to_string(X) ->
lists:concat([X]).
%%
to_list(L) when list(L) ->
L;
to_list(A) when atom(A) ->
atom_to_list(A).
lowercase([C|S]) -> [lowercase(C)|S];
lowercase(C) when C>=$A, C=<$Z -> C+32;
lowercase(C) -> C.
%%
uppercase([C|S]) -> [uppercase(C)|S];
uppercase(C) when C>=$a, C=<$z -> C-32;
uppercase(C) -> C.
%%
lowercase_string(String) ->
lists:map(fun(X) -> lowercase(X) end, String).
%% integer_to_hex
integer_to_hex(I) when I<10 ->
integer_to_list(I);
integer_to_hex(I) when I<16 ->
[I-10+$A];
integer_to_hex(I) when I>=16 ->
N = trunc(I/16),
integer_to_hex(N) ++ integer_to_hex(I rem 16).
%% hex_to_integer
hex_to_integer(Hex) ->
DEHEX = fun (H) when H >= $a, H =< $f -> H - $a + 10;
(H) when H >= $A, H =< $F -> H - $A + 10;
(H) when H >= $0, H =< $9 -> H - $0
end,
lists:foldl(fun(E, Acc) -> Acc*16+DEHEX(E) end, 0, Hex).
%% string_to_hex
string_to_hex(String) ->
HEXC = fun (D) when D > 9 -> $a + D - 10;
(D) -> $0 + D
end,
lists:foldr(fun (E, Acc) ->
[HEXC(E div 16),HEXC(E rem 16)|Acc]
end, [],
String).
%% hex_to_string
hex_to_string(Hex) ->
DEHEX = fun (H) when H >= $a -> H - $a + 10;
(H) when H >= $A -> H - $A + 10;
(H) -> H - $0
end,
{String, _} =
lists:foldr(fun (E, {Acc, nolow}) ->
{Acc, DEHEX(E)};
(E, {Acc, LO}) ->
{[DEHEX(E)*16+LO|Acc], nolow}
end, {[], nolow},
Hex),
String.
%% mk_list
mk_list([]) ->
[];
mk_list([X]) ->
to_string(X);
mk_list([X|Rest]) ->
[to_string(X)," ",mk_list(Rest)].
universal_time_as_string() ->
time_to_string(calendar:universal_time(), "GMT").
local_time_as_gmt_string(LocalTime) ->
time_to_string(calendar:local_time_to_universal_time(LocalTime),"GMT").
time_to_string( {{Year, Month, Day}, {Hour, Min, Sec}}, Zone) ->
io_lib:format("~s, ~s ~s ~w ~s:~s:~s ~s",
[day(Year, Month, Day),
mk2(Day), month(Month), Year,
mk2(Hour), mk2(Min), mk2(Sec), Zone]).
mk2(I) when I < 10 ->
[$0 | integer_to_list(I)];
mk2(I) ->
integer_to_list(I).
day(Year, Month, Day) ->
int_to_wd(calendar:day_of_the_week(Year, Month, Day)).
month(1) ->
"Jan";
month(2) ->
"Feb";
month(3) ->
"Mar";
month(4) ->
"Apr";
month(5) ->
"May";
month(6) ->
"Jun";
month(7) ->
"Jul";
month(8) ->
"Aug";
month(9) ->
"Sep";
month(10) ->
"Oct";
month(11) ->
"Nov";
month(12) ->
"Dec".
month_str_to_int("Jan") ->
1;
month_str_to_int("Jun") ->
6;
month_str_to_int("Jul") ->
7;
month_str_to_int("Feb") ->
2;
month_str_to_int("Mar") ->
3;
month_str_to_int("Apr") ->
4;
month_str_to_int("May") ->
5;
month_str_to_int("Aug") ->
8;
month_str_to_int("Sep") ->
7;
month_str_to_int("Oct") ->
10;
month_str_to_int("Nov") ->
11;
month_str_to_int("Dec") ->
12.
day_str_to_int("Mon") ->
1;
day_str_to_int("Tue") ->
2;
day_str_to_int("Wed") ->
3;
day_str_to_int("Thu") ->
4;
day_str_to_int("Fri") ->
5;
day_str_to_int("Sat") ->
6;
day_str_to_int("Sun") ->
7.
%% Wed, 23 Jan 2002 19:07:44 GMT
stringdate_to_datetime([$ |T]) ->
stringdate_to_datetime(T);
stringdate_to_datetime([_D1, _D2, _D3, $\,, $ |Tail]) ->
stringdate_to_datetime1(Tail).
stringdate_to_datetime1([A, B, $\s |T]) ->
stringdate_to_datetime2(T, list_to_integer([A,B]));
stringdate_to_datetime1([A, $\s |T]) ->
stringdate_to_datetime2(T, list_to_integer([A])).
stringdate_to_datetime2([M1, M2, M3, $\s , Y1, Y2, Y3, Y4, $\s ,
H1, H2, $:, Min1, Min2,$:,
S1, S2,$\s ,$G, $M, $T|_], Day) ->
{{list_to_integer([Y1,Y2,Y3,Y4]),
month_str_to_int([M1, M2, M3]), Day},
{list_to_integer([H1, H2]),
list_to_integer([Min1, Min2]),
list_to_integer([S1, S2])}}.
%% used by If-Modified-Since header code
is_modified_p(FI, UTC_string) ->
case catch stringdate_to_datetime(UTC_string) of
{'EXIT', _ } ->
true;
UTC ->
Mtime = FI#file_info.mtime,
MtimeUTC = calendar:local_time_to_universal_time(Mtime),
MtimeUTC > UTC
end.
ticker(Time, Msg) ->
S = self(),
spawn_link(yaws, ticker, [Time, S, Msg]).
ticker(Time, To, Msg) ->
process_flag(trap_exit, true),
yaws_ticker:ticker(Time, To, Msg).
fmt_ip({A,B,C,D}) ->
[integer_to_list(A), $.,
integer_to_list(B), $.,
integer_to_list(C), $.,
integer_to_list(D)].
parse_ip(Val) ->
case string:tokens(Val, [$.]) of
Nums = [_X1, _X2, _X3,_X4] ->
L = lists:map(
fun(S) -> (catch list_to_integer(S)) end,
Nums),
case lists:zf(fun(I) when integer(I),
0 =< I,
I =< 255 ->
true;
(_) ->
false
end, L) of
L2 when length(L2) == 4 ->
list_to_tuple(L2);
_ ->
error
end;
_ ->
error
end.
address(GConf, Sconf) ->
?F("<address> ~s Server at ~s </address>",
[
GConf#gconf.yaws,
Sconf#sconf.servername]).
is_space($\s) ->
true;
is_space($\r) ->
true;
is_space($\n) ->
true;
is_space($\r) ->
true;
is_space(_) ->
false.
strip_spaces(String) ->
strip_spaces(String, both).
strip_spaces(String, left) ->
drop_spaces(String);
strip_spaces(String, right) ->
lists:reverse(drop_spaces(lists:reverse(String)));
strip_spaces(String, both) ->
strip_spaces(drop_spaces(String), right).
drop_spaces([]) ->
[];
drop_spaces(YS=[X|XS]) ->
case is_space(X) of
true ->
drop_spaces(XS);
false ->
YS
end.
%%% basic uuencode and decode functionality
list_to_uue(L) -> list_to_uue(L, []).
list_to_uue([], Out) ->
reverse([$\n,enc(0)|Out]);
list_to_uue(L, Out) ->
{L45, L1} = get_45(L),
Encoded = encode_line(L45),
list_to_uue(L1, reverse(Encoded, Out)).
uue_to_list(L) ->
uue_to_list(L, []).
uue_to_list([], Out) ->
reverse(Out);
uue_to_list(L, Out) ->
{Decoded, L1} = decode_line(L),
uue_to_list(L1, reverse(Decoded, Out)).
encode_line(L) ->
[enc(length(L))|encode_line1(L)].
encode_line1([C0, C1, C2|T]) ->
Char1 = enc(C0 bsr 2),
Char2 = enc((C0 bsl 4) band 8#60 bor (C1 bsr 4) band 8#17),
Char3 = enc((C1 bsl 2) band 8#74 bor (C2 bsr 6) band 8#3),
Char4 = enc(C2 band 8#77),
[Char1,Char2,Char3,Char4|encode_line1(T)];
encode_line1([C1, C2]) -> encode_line1([C1, C2, 0]);
encode_line1([C]) -> encode_line1([C,0,0]);
encode_line1([]) -> [$\n].
decode_line([H|T]) ->
case dec(H) of
0 -> {[], []};
Len -> decode_line(T, Len, [])
end.
decode_line([P0,P1,P2,P3|T], N, Out) when N >= 3->
Char1 = 16#FF band ((dec(P0) bsl 2) bor (dec(P1) bsr 4)),
Char2 = 16#FF band ((dec(P1) bsl 4) bor (dec(P2) bsr 2)),
Char3 = 16#FF band ((dec(P2) bsl 6) bor dec(P3)),
decode_line(T, N-3, [Char3,Char2,Char1|Out]);
decode_line([P0,P1,P2,_|T], 2, Out) ->
Char1 = 16#FF band ((dec(P0) bsl 2) bor (dec(P1) bsr 4)),
Char2 = 16#FF band ((dec(P1) bsl 4) bor (dec(P2) bsr 2)),
{reverse([Char2,Char1|Out]), tl(T)};
decode_line([P0,P1,_,_|T], 1, Out) ->
Char1 = 16#FF band ((dec(P0) bsl 2) bor (dec(P1) bsr 4)),
{reverse([Char1|Out]), tl(T)};
decode_line(T, 0, Out) ->
{reverse(Out), tl(T)}.
get_45(L) -> get_45(L, 45, []).
get_45(L, 0, F) -> {reverse(F), L};
get_45([H|T], N, L) -> get_45(T, N-1, [H|L]);
get_45([], _N, L) -> {reverse(L), []}.
%% enc/1 is the basic 1 character encoding function to make a char printing
%% dec/1 is the inverse
enc(0) -> $`;
enc(C) -> (C band 8#77) + $ .
dec(Char) -> (Char - $ ) band 8#77.
to_octal(I) -> reverse(to_octal1(I)).
to_octal1(0) -> [];
to_octal1(I) -> [$0 + I band 7|to_octal1(I bsr 3)].
oct_to_dig(O) -> oct_to_dig(O, 0).
oct_to_dig([], D) -> D;
oct_to_dig([H|T], D) -> oct_to_dig(T, D*8 + H - $0).
printversion() ->
io:format("Yaws ~s~n", [yaws_vsn:version()]),
init:stop().
%% our default arg rewriteer does's of cource nothing
arg_rewrite(A) ->
A.
to_lowerchar(C) when C >= $A, C =< $Z ->
C+($a-$A);
to_lowerchar(C) ->
C.
to_lower([C|Cs]) when C >= $A, C =< $Z ->
[C+($a-$A)|to_lower(Cs)];
to_lower([C|Cs]) ->
[C|to_lower(Cs)];
to_lower([]) ->
[].
funreverse(List, Fun) ->
funreverse(List, Fun, []).
funreverse([H|T], Fun, Ack) ->
funreverse(T, Fun, [Fun(H)|Ack]);
funreverse([], _Fun, Ack) ->
Ack.
%% splits Str in two parts
%% First part leading Upto SubStr and remaining part after
split_at(Str, Substr) ->
split_at(Str, Substr,[]).
split_at(Str, Substr, Ack) ->
case is_prefix(Substr, Str) of
{true, Tail} ->
{lists:reverse(Ack), Tail};
false ->
case Str of
[] ->
{lists:reverse(Ack), []};
[H|T] ->
split_at(T, Substr, [H|Ack])
end
end.
%% is arg1 a prefix of arg2
is_prefix([H|T1], [H|T2]) ->
is_prefix(T1, T2);
is_prefix([], T) ->
{true, T};
is_prefix(_,_) ->
false.
%% Split a string of words seperated by Sep into a list of words and
%% strip off white space.
%%
%% HTML semantics are used, such that empty words are omitted.
split_sep(undefined, _Sep) ->
[];
split_sep(L, Sep) ->
case drop_spaces(L) of
[] -> [];
[Sep|T] -> split_sep(T, Sep);
[C|T] -> split_sep(T, Sep, [C], [])
end.
split_sep([], _Sep, AccL) ->
lists:reverse(AccL);
split_sep([Sep|T], Sep, AccL) ->
split_sep(T, Sep, AccL);
split_sep([C|T], Sep, AccL) ->
split_sep(T, Sep, [C], AccL).
split_sep([], _Sep, AccW, AccL) ->
lists:reverse([lists:reverse(drop_spaces(AccW))|AccL]);
split_sep([Sep|Tail], Sep, AccW, AccL) ->
split_sep(drop_spaces(Tail),
Sep,
[lists:reverse(drop_spaces(AccW))|AccL]);
split_sep([C|Tail], Sep, AccW, AccL) ->
split_sep(Tail, Sep, [C|AccW], AccL).
%% imperative out header management
outh_set_status_code(Code) ->
put(outh, (get(outh))#outh{status = Code}),
ok.
outh_set_non_cacheable(_Version) ->
put(outh, (get(outh))#outh{cache_control = "Cache-Control: no-cache\r\n"}),
ok.
outh_set_content_type(Mime) ->
put(outh, (get(outh))#outh{content_type =
make_content_type_header(Mime)}),
ok.
outh_set_cookie(C) ->
put(outh, (get(outh))#outh{set_cookie = ["Set-Cookie: " , C, "\r\n"]}),
ok.
outh_clear_headers() ->
H = get(outh),
put(outh, #outh{status = H#outh.status,
doclose = true,
chunked = false,
connection = make_connection_close_header(true)}),
ok.
outh_set_static_headers(Req, UT, Headers) ->
outh_set_static_headers(Req, UT, Headers, all).
outh_set_static_headers(Req, UT, Headers, Range) ->
H = get(outh),
{DoClose, _Chunked} = dcc(Req, Headers),
H2 = H#outh{
status = case Range of
all -> 200;
{fromto, _From, _To, _Tot} -> 206
end,
chunked = false,
date = make_date_header(),
server = make_server_header(),
last_modified = make_last_modified_header(UT#urltype.finfo),
etag = make_etag_header(UT#urltype.finfo),
content_range = make_content_range_header(Range),
content_length = make_content_length_header(
case Range of
all ->
UT#urltype.finfo;
{fromto, From, To, _Tot} ->
To - From + 1
end
),
content_type = make_content_type_header(UT#urltype.mime),
connection = make_connection_close_header(DoClose),
doclose = DoClose,
contlen = (UT#urltype.finfo)#file_info.size
},
put(outh, H2).
outh_set_304_headers(Req, UT, Headers) ->
H = get(outh),
{DoClose, _Chunked} = dcc(Req, Headers),
H2 = H#outh{
status = 304,
chunked = false,
date = make_date_header(),
server = make_server_header(),
last_modified = make_last_modified_header(UT#urltype.finfo),
etag = make_etag_header(UT#urltype.finfo),
content_length = make_content_length_header(0),
connection = make_connection_close_header(DoClose),
doclose = DoClose,
contlen = 0
},
put(outh, H2).
outh_set_dyn_headers(Req, Headers) ->
H = get(outh),
{DoClose, Chunked} = dcc(Req, Headers),
H2 = H#outh{
status = 200,
date = make_date_header(),
server = make_server_header(),
connection = make_connection_close_header(DoClose),
content_type = make_content_type_header("text/html"),
doclose = DoClose,
chunked = Chunked,
transfer_encoding =
make_transfer_encoding_chunked_header(Chunked)},
put(outh, H2).
outh_set_connection_close(Bool) ->
H = get(outh),
H2 = H#outh{connection = make_connection_close_header(Bool),
doclose = Bool},
put(outh, H2),
ok.
outh_set_content_length(Int) ->
H = get(outh),
H2 = H#outh{content_length = make_content_length_header(Int)},
put(outh, H2).
outh_set_dcc(Req, Headers) ->
H = get(outh),
{DoClose, Chunked} = dcc(Req, Headers),
H2 = H#outh{connection = make_connection_close_header(DoClose),
doclose = DoClose,
chunked = Chunked,
transfer_encoding =
make_transfer_encoding_chunked_header(Chunked)},
put(outh, H2).
%% can only turn if off, not on.
%% if it allready is off, it's off because the cli headers forced us.
outh_set_transfer_encoding_off() ->
H = get(outh),
H2 = H#outh{chunked = false,
transfer_encoding =
make_transfer_encoding_chunked_header(false)},
put(outh, H2).
dcc(Req, Headers) ->
DoClose = case Req#http_request.version of
{1, 0} ->
case Headers#headers.keep_alive of
undefined ->
true;
_ ->
false
end;
{1, 1} ->
false;
{0,9} ->
true
end,
Chunked = case Req#http_request.version of
{1, 0} ->
false;
{1,1} ->
true;
{0,9} ->
false
end,
{DoClose, Chunked}.
%%
%% The following all make_ function return an actual header string
%%
make_allow_header() ->
"Allow: GET, POST, PUT, OPTIONS, HEAD\r\n".
make_server_header() ->
["Server: Yaws/", yaws_vsn:version(), " Yet Another Web Server\r\n"].
make_last_modified_header(FI) ->
N = element(2, now()),
Inode = FI#file_info.inode, %% unix only
case get({last_modified, Inode}) of
{Str, Secs} when N < (Secs+10) ->
Str;
_ ->
S = do_make_last_modified(FI),
put({last_modified, Inode}, {S, N}),
S
end.
do_make_last_modified(FI) ->
Then = FI#file_info.mtime,
["Last-Modified: ", yaws:local_time_as_gmt_string(Then), "\r\n"].
make_location_header(Where) ->
["Location: ", Where, "\r\n"].
make_etag_header(FI) ->
ETag = make_etag(FI),
["Etag: ", ETag, "\r\n"].
make_etag(FI) ->
{{Y,M,D}, {H,Min, S}} = FI#file_info.mtime,
Inode = FI#file_info.inode,
pack_bin( <<0:6,(Y band 2#11111111):8,M:4,D:5,H:5,Min:6,S:6,Inode:32>> ).
pack_bin(<<_:6,A:6,B:6,C:6,D:6,E:6,F:6,G:6,H:6,I:6,J:6,K:6>>) ->
[$",
pc(A),pc(B),pc(C),pc(D),pc(E),pc(F),pc(G),pc(H),pc(I),pc(J),pc(K),
$"].
%% Like Base64 for no particular reason.
pc(X) when X >= 0, X < 26 ->
X + $A;
pc(X) when X >= 26, X < 52 ->
X - 26 + $a;
pc(X) when X >= 52, X < 62 ->
X - 52 + $0;
pc(62) ->
$+;
pc(63) ->
$/.
make_content_type_header(no_content_type) ->
undefined;
make_content_type_header(MimeType) ->
["Content-Type: ", MimeType, "\r\n"].
make_content_range_header(all) ->
undefined;
make_content_range_header({fromto, From, To, Tot}) ->
["Content-Range: bytes ",
integer_to_list(From), $-, integer_to_list(To),
$/, integer_to_list(Tot), $\r, $\n].
make_content_length_header(Size) when integer(Size) ->
["Content-Length: ", integer_to_list(Size), "\r\n"];
make_content_length_header(FI) ->
Size = FI#file_info.size,
["Content-Length: ", integer_to_list(Size), "\r\n"].
make_connection_close_header(true) ->
"Connection: close\r\n";
make_connection_close_header(false) ->
undefined.
make_transfer_encoding_chunked_header(true) ->
"Transfer-Encoding: chunked\r\n";
make_transfer_encoding_chunked_header(false) ->
undefined.
make_www_authenticate_header(Realm) ->
["WWW-Authenticate: Basic realm=\"", Realm, ["\"\r\n"]].
make_date_header() ->
N = element(2, now()),
case get(date_header) of
{Str, Secs} when (Secs+10) > N ->
H = ["Date: ", yaws:universal_time_as_string(), "\r\n"],
put(date_header, {H, N}),
H;
{Str, Secs} ->