/
yaws.erl
2188 lines (1852 loc) · 62.6 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("../include/yaws.hrl").
-include("../include/yaws_api.hrl").
-include("yaws_debug.hrl").
-include_lib("kernel/include/file.hrl").
-export([start/0, stop/0, hup/1, restart/0, modules/0, load/0]).
-export([start_embedded/1, start_embedded/2, start_embedded/3,
start_embedded/4,
add_server/2]).
-export([new_ssl/0,
ssl_keyfile/1, ssl_keyfile/2,
ssl_certfile/1, ssl_certfile/2,
ssl_verify/1, ssl_verify/2,
ssl_depth/1, ssl_depth/2,
ssl_password/1, ssl_password/2,
ssl_cacertfile/1, ssl_cacertfile/2,
ssl_ciphers/1, ssl_ciphers/2,
ssl_cachetimeout/1, ssl_cachetimeout/2]).
-export([first/2, elog/2, filesize/1, upto/2, to_string/1, to_list/1,
integer_to_hex/1, hex_to_integer/1,
string_to_hex/1, hex_to_string/1,
is_modified_p/2, flag/3, dohup/1, is_ssl/1,
address/0, is_space/1, setopts/3,
eat_crnl/2, get_chunk_num/2, get_chunk/4,
list_to_uue/1, uue_to_list/1, printversion/0,
strip_spaces/1, strip_spaces/2,
month/1, mk2/1, home/0,
arg_rewrite/1, to_lowerchar/1, to_lower/1, funreverse/2, is_prefix/2,
split_sep/2, accepts_gzip/2, upto_char/2, deepmap/2,
ticker/2, ticker/3]).
-export([outh_set_status_code/1,
outh_set_non_cacheable/1,
outh_set_content_type/1,
outh_set_content_encoding/1,
outh_set_cookie/1,
outh_clear_headers/0,
outh_set_static_headers/3, outh_set_static_headers/4,
outh_set_304_headers/3,
outh_set_dyn_headers/3,
outh_set_connection/1,
outh_set_content_length/1,
outh_set_dcc/2,
outh_set_transfer_encoding_off/0,
outh_fix_doclose/0,
dcc/2]).
-export([make_allow_header/0,
make_allow_header/1,
make_server_header/0,
make_last_modified_header/1,
make_location_header/1,
make_etag_header/1,
make_content_range_header/1,
make_content_length_header/1,
make_content_encoding_header/1,
make_connection_close_header/1,
make_transfer_encoding_chunked_header/1,
make_www_authenticate_header/1,
make_etag/1,
make_content_type_header/1,
make_date_header/0]).
-export([outh_get_status_code/0,
outh_get_contlen/0,
outh_get_act_contlen/0,
outh_inc_act_contlen/1,
outh_get_doclose/0,
outh_get_chunked/0,
outh_get_content_encoding/0,
outh_get_content_encoding_header/0,
outh_get_content_type/0,
outh_serialize/0]).
-export([accumulate_header/1, headers_to_str/1,
getuid/0,
user_to_home/1,
uid_to_name/1,
exists/1,
mkdir/1]).
-export([do_recv/3, cli_recv/3,
gen_tcp_send/2,
http_get_headers/2]).
-export([sconf_to_srvstr/1,
redirect_host/2, redirect_port/1,
redirect_scheme_port/1, redirect_scheme/1,
tmpdir/0,
id_dir/1, ctl_file/1]).
-import(lists, [reverse/1, reverse/2]).
start() ->
application:start(yaws, permanent).
stop() ->
application:stop(yaws).
%%% Quick and easy way of starting Yaws in embedded mode.
%%% No need for any start-script switches and no dependencies
%%% to Yaws header files. Just call start_embedded/N and
%%% you are in the air.
start_embedded(DocRoot) ->
start_embedded(DocRoot, []).
start_embedded(DocRoot, SL) when list(DocRoot),list(SL) ->
start_embedded(DocRoot, SL, []).
start_embedded(DocRoot, SL, GL) when list(DocRoot),list(SL),list(GL) ->
start_embedded(DocRoot, SL, GL, "default").
start_embedded(DocRoot, SL, GL, Id) when list(DocRoot),list(SL),list(GL) ->
case application:load(yaws) of
ok -> ok;
{error, {already_loaded,yaws}} -> ok;
_ -> exit("Can not load yaws")
end,
ok = application:set_env(yaws, embedded, true),
ok = application:set_env(yaws, id, Id),
application:start(yaws),
GC = setup_gconf(GL, yaws_config:make_default_gconf(false, Id)),
SC = setup_sconf(DocRoot, #sconf{}, SL),
yaws_config:add_yaws_soap_srv(GC),
SCs = yaws_config:add_yaws_auth([SC]),
yaws_api:setconf(GC, [SCs]).
add_server(DocRoot, SL) when list(DocRoot),list(SL) ->
SC = setup_sconf(DocRoot, #sconf{}, SL),
yaws_config:add_sconf(SC).
%%% Access functions for the SSL record.
new_ssl() -> #ssl{}.
%%
ssl_keyfile(S) -> S#ssl.keyfile.
ssl_certfile(S) -> S#ssl.certfile.
ssl_verify(S) -> S#ssl.verify.
ssl_depth(S) -> S#ssl.depth.
ssl_password(S) -> S#ssl.password.
ssl_cacertfile(S) -> S#ssl.cacertfile.
ssl_ciphers(S) -> S#ssl.ciphers.
ssl_cachetimeout(S) -> S#ssl.cachetimeout.
%%
ssl_keyfile(S, Keyfile) -> S#ssl{keyfile = Keyfile}.
ssl_certfile(S, Certfile) -> S#ssl{certfile = Certfile}.
ssl_verify(S, Verify) -> S#ssl{verify = Verify}.
ssl_depth(S, Depth) -> S#ssl{depth = Depth}.
ssl_password(S, Password) -> S#ssl{password = Password}.
ssl_cacertfile(S, Cacertfile) -> S#ssl{cacertfile = Cacertfile}.
ssl_ciphers(S, Ciphers) -> S#ssl{ciphers = Ciphers}.
ssl_cachetimeout(S, Cachetimeout) -> S#ssl{cachetimeout = Cachetimeout}.
setup_gconf([], GC) -> GC;
setup_gconf(GL, GC) ->
#gconf{yaws_dir = lkup(yaws_dir, GL,
GC#gconf.yaws_dir),
trace = lkup(trace, GL,
GC#gconf.trace),
flags = set_gc_flags(lkup(flags, GL, []),
GC#gconf.flags),
logdir = lkup(logdir, GL,
GC#gconf.logdir),
ebin_dir = lkup(ebin_dir, GL,
GC#gconf.ebin_dir),
runmods = lkup(runmods, GL,
GC#gconf.runmods),
keepalive_timeout = lkup(keepalive_timeout, GL,
GC#gconf.keepalive_timeout),
max_num_cached_files = lkup(max_num_cached_files, GL,
GC#gconf.max_num_cached_files),
max_num_cached_bytes = lkup(max_num_cached_bytes, GL,
GC#gconf.max_num_cached_bytes),
max_size_cached_file = lkup(max_size_cached_file, GL,
GC#gconf.max_size_cached_file),
large_file_chunk_size = lkup(large_file_chunk_size, GL,
GC#gconf.large_file_chunk_size),
log_wrap_size = lkup(log_wrap_size, GL,
GC#gconf.log_wrap_size),
cache_refresh_secs = lkup(cache_refresh_secs, GL,
GC#gconf.cache_refresh_secs),
mnesia_dir = lkup(mnesia_dir, GL,
GC#gconf.mnesia_dir),
include_dir = lkup(include_dir, GL,
GC#gconf.include_dir),
phpexe = lkup(phpexe, GL,
GC#gconf.phpexe),
yaws = lkup(yaws, GL,
GC#gconf.yaws),
id = lkup(id, GL,
GC#gconf.id),
enable_soap = lkup(enable_soap, GL,
GC#gconf.enable_soap)
}.
set_gc_flags([{tty_trace, Bool}|T], Flags) ->
set_gc_flags(T, flag(Flags,?GC_TTY_TRACE, Bool));
set_gc_flags([{debug, Bool}|T], Flags) ->
set_gc_flags(T, flag(Flags, ?GC_DEBUG, Bool));
set_gc_flags([{auth_log, Bool}|T], Flags) ->
set_gc_flags(T, flag(Flags, ?GC_AUTH_LOG, Bool));
set_gc_flags([{copy_errlog, Bool}|T], Flags) ->
set_gc_flags(T, flag(Flags, ?GC_COPY_ERRLOG, Bool));
set_gc_flags([{backwards_compat_parse, Bool}|T], Flags) ->
set_gc_flags(T, flag(Flags, ?GC_BACKWARDS_COMPAT_PARSE, Bool));
set_gc_flags([{log_resolve_hostname, Bool}|T], Flags) ->
set_gc_flags(T, flag(Flags, ?GC_LOG_RESOLVE_HOSTNAME, Bool));
set_gc_flags([{fail_on_bind_err, Bool}|T], Flags) ->
set_gc_flags(T, flag(Flags,?GC_FAIL_ON_BIND_ERR,Bool));
set_gc_flags([{pick_first_virthost_on_nomatch, Bool}|T], Flags) ->
set_gc_flags(T, flag(Flags, ?GC_PICK_FIRST_VIRTHOST_ON_NOMATCH,Bool));
set_gc_flags([{use_fdsrv, Bool}|T], Flags) ->
set_gc_flags(T, flag(Flags,?GC_USE_FDSRV,Bool));
set_gc_flags([_|T], Flags) ->
set_gc_flags(T, Flags);
set_gc_flags([], Flags) ->
Flags.
setup_sconf(DocRoot, D, SL) ->
#sconf{port = lkup(port, SL,
D#sconf.port),
flags = set_sc_flags(lkup(flags, SL, []),
?SC_DEF),
redirect_map = lkup(redirect_map, SL,
D#sconf.redirect_map),
rhost = lkup(rhost, SL,
D#sconf.rhost),
rmethod = lkup(rmethod, SL,
D#sconf.rmethod),
docroot = DocRoot,
xtra_docroots = lkup(xtra_docroots, SL,
D#sconf.xtra_docroots),
listen = lkup(listen, SL,
D#sconf.listen),
servername = lkup(servername, SL,
D#sconf.servername),
ets = lkup(ets, SL,
D#sconf.ets),
ssl = lkup(ssl, SL,
D#sconf.ssl),
authdirs = lkup(authdirs, SL,
D#sconf.authdirs),
partial_post_size = lkup(partial_post_size, SL,
D#sconf.partial_post_size),
appmods = lkup(appmods, SL,
D#sconf.appmods),
errormod_404 = lkup(errormod_404, SL,
D#sconf.errormod_404),
errormod_crash = lkup(errormod_crash, SL,
D#sconf.errormod_crash),
arg_rewrite_mod = lkup(arg_rewrite_mod, SL,
D#sconf.arg_rewrite_mod),
opaque = lkup(opaque, SL,
D#sconf.opaque),
start_mod = lkup(start_mod, SL,
D#sconf.start_mod),
allowed_scripts = lkup(allowed_scripts, SL,
D#sconf.allowed_scripts),
revproxy = lkup(revproxy, SL,
D#sconf.revproxy),
soptions = lkup(soptions, SL,
D#sconf.soptions)}.
set_sc_flags([{access_log, Bool}|T], Flags) ->
set_sc_flags(T, flag(Flags, ?SC_ACCESS_LOG, Bool));
set_sc_flags([{add_port, Bool}|T], Flags) ->
set_sc_flags(T, flag(Flags, ?SC_ADD_PORT, Bool));
set_sc_flags([{tilde_expand, Bool}|T], Flags) ->
set_sc_flags(T, flag(Flags, ?SC_TILDE_EXPAND, Bool));
set_sc_flags([{dir_listings, Bool}|T], Flags) ->
set_sc_flags(T, flag(Flags, ?SC_DIR_LISTINGS, Bool));
set_sc_flags([{deflate, Bool}|T], Flags) ->
set_sc_flags(T, flag(Flags, ?SC_DEFLATE, Bool));
set_sc_flags([{dir_all_zip, Bool}|T], Flags) ->
set_sc_flags(T, flag(Flags, ?SC_DIR_ALL_ZIP, Bool));
set_sc_flags([{dav, Bool}|T], Flags) ->
set_sc_flags(T, flag(Flags, ?SC_DAV, Bool));
set_sc_flags([_|T], Flags) ->
set_sc_flags(T, Flags);
set_sc_flags([], Flags) ->
Flags.
lkup(Key, List, Def) ->
case lists:keysearch(Key, 1, List) of
{value,{_,Value}} -> Value;
_ -> Def
end.
hup(Sock) ->
spawn(fun() ->
group_leader(whereis(user), self()),
dohup(Sock)
end).
dohup(Sock) ->
Env = yaws_sup:get_app_args(),
Res = (catch case yaws_config:load(Env) of
{ok, Gconf, Sconfs} ->
yaws_api:setconf(Gconf, Sconfs);
Err ->
Err
end),
gen_event:notify(yaws_event_manager, {yaws_hupped, Res}),
gen_event:notify(yaws_log, {yaws_hupped, Res}),
gen_tcp:send(Sock, io_lib:format("hupped: ~p~n", [Res])),
gen_tcp:close(Sock).
%%% 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)].
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".
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).
integer_to_hex(I) ->
case catch erlang:integer_to_list(I, 16) of
{'EXIT', _} ->
old_integer_to_hex(I);
Int ->
Int
end.
old_integer_to_hex(I) when I<10 ->
integer_to_list(I);
old_integer_to_hex(I) when I<16 ->
[I-10+$A];
old_integer_to_hex(I) when I>=16 ->
N = trunc(I/16),
old_integer_to_hex(N) ++ old_integer_to_hex(I rem 16).
%% hex_to_integer
hex_to_integer(Hex) ->
erlang:list_to_integer(Hex, 16).
%% 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.
universal_time_as_string() ->
time_to_string(calendar:universal_time(), "GMT").
local_time_as_gmt_string(LocalTime) ->
time_to_string(erlang:localtime_to_universaltime(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 ->
[$0 | integer_to_list(I)];
mk2(I) ->
integer_to_list(I).
day(Year, Month, Day) ->
int_to_wd(calendar:day_of_the_week(Year, Month, Day)).
month(1) ->
"Jan";
month(2) ->
"Feb";
month(3) ->
"Mar";
month(4) ->
"Apr";
month(5) ->
"May";
month(6) ->
"Jun";
month(7) ->
"Jul";
month(8) ->
"Aug";
month(9) ->
"Sep";
month(10) ->
"Oct";
month(11) ->
"Nov";
month(12) ->
"Dec".
month_str_to_int("Jan") ->
1;
month_str_to_int("Jun") ->
6;
month_str_to_int("Jul") ->
7;
month_str_to_int("Feb") ->
2;
month_str_to_int("Mar") ->
3;
month_str_to_int("Apr") ->
4;
month_str_to_int("May") ->
5;
month_str_to_int("Aug") ->
8;
month_str_to_int("Sep") ->
9;
month_str_to_int("Oct") ->
10;
month_str_to_int("Nov") ->
11;
month_str_to_int("Dec") ->
12.
stringdate_to_datetime([$ |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, $T|_], Day) ->
{{list_to_integer([Y1,Y2,Y3,Y4]),
month_str_to_int([M1, M2, M3]), Day},
{list_to_integer([H1, H2]),
list_to_integer([Min1, Min2]),
list_to_integer([S1, S2])}}.
%% used by If-Modified-Since header code
is_modified_p(FI, UTC_string) ->
case catch stringdate_to_datetime(UTC_string) of
{'EXIT', _ } ->
true;
UTC ->
Mtime = FI#file_info.mtime,
MtimeUTC = erlang:localtime_to_universaltime(Mtime),
MtimeUTC > UTC
end.
ticker(Time, Msg) ->
ticker(Time, self(), Msg).
ticker(Time, To, Msg ) ->
spawn_link(fun() ->
process_flag(trap_exit, true),
yaws_ticker:ticker(Time, To, Msg)
end).
address() ->
?F("<address> ~s Server at ~s </address>",
[
(get(gc))#gconf.yaws,
(get(sc))#sconf.servername]).
is_space($\s) ->
true;
is_space($\r) ->
true;
is_space($\n) ->
true;
is_space($\t) ->
true;
is_space(_) ->
false.
strip_spaces(String) ->
strip_spaces(String, both).
strip_spaces(String, left) ->
drop_spaces(String);
strip_spaces(String, right) ->
lists:reverse(drop_spaces(lists:reverse(String)));
strip_spaces(String, both) ->
strip_spaces(drop_spaces(String), right).
drop_spaces([]) ->
[];
drop_spaces(YS=[X|XS]) ->
case is_space(X) of
true ->
drop_spaces(XS);
false ->
YS
end.
%%% basic uuencode and decode functionality
list_to_uue(L) -> list_to_uue(L, []).
list_to_uue([], Out) ->
reverse([$\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_generated:version()]),
init:stop().
%% our default arg rewriteer does's of cource nothing
arg_rewrite(A) ->
A.
is_ssl(#sconf{ssl = undefined}) ->
nossl;
is_ssl(#sconf{ssl = S}) when record(S, ssl) ->
ssl.
%% delall(H, [H|T]) ->
%% delall(H,T);
%% delall(H,[H1|T]) ->
%% [H1 | delall(H, T)];
%% delall(_,[]) ->
%% [].
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([]) ->
[];
to_lower(A) when is_atom(A) ->
to_lower(atom_to_list(A)).
funreverse(List, Fun) ->
funreverse(List, Fun, []).
funreverse([H|T], Fun, Ack) ->
funreverse(T, Fun, [Fun(H)|Ack]);
funreverse([], _Fun, Ack) ->
Ack.
%% 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).
%% header parsing
parse_qval(S) ->
parse_qval([], S).
parse_qval(A, ";q="++Q) ->
{lists:reverse(A), parse_qvalue(Q)};
parse_qval(A, "") ->
{lists:reverse(A), 1000};
parse_qval(A, [C|T]) ->
parse_qval([C|A], T).
parse_qvalue("0") ->
0;
parse_qvalue("0.") ->
0;
parse_qvalue("1") ->
1000;
parse_qvalue("1.") ->
1000;
parse_qvalue("1.0") ->
1000;
parse_qvalue("1.00") ->
1000;
parse_qvalue("1.000") ->
1000;
parse_qvalue("0."++[D1]) ->
three_digits_to_integer(D1,$0,$0);
parse_qvalue("0."++[D1,D2]) ->
three_digits_to_integer(D1,D2,$0);
parse_qvalue("0."++[D1,D2,D3]) ->
three_digits_to_integer(D1,D2,D3);
parse_qvalue(_) ->
% error
0.
three_digits_to_integer(D1, D2, D3) ->
100*(D1-$0)+10*(D2-$0)+D3-$0.
%% has_buggy_deflate(UserAgent, Mime) ->
%% UA = parse_ua(UserAgent),
%% in_ua(
%% fun("Mozilla/5.0") ->
%% in_comment(
%% fun("rv:0."++_) ->
%% true;
%% ("Konqueror"++_) ->
%% true;
%% (_) ->
%% false
%% end,
%% UA);
%% ("Mozilla/4.0") ->
%% in_comment(
%% fun("MSIE"++_) ->
%% % The fact that IE is
%% % broken does of
%% % course mean that we
%% % will have to abondon
%% % `deflate' (in favor
%% % of `gzip')
%% % altogether. To
%% % do...
%% true;
%% (_) ->
%% false
%% end,
%% UA);
%% ("AppleWebKit"++_) ->
%% true;
%% ("Galeon"++_) ->
%% true;
%% ("w3m"++_) ->
%% % Problems when saving.
%% Mime /= "text/html";
%% (_) ->
%% false
%% end,
%% UA).
%% Gzip encoding
accepts_gzip(H, Mime) ->
case [Val || {_,_,'Accept-Encoding',_,Val}<- H#headers.other] of
[] ->
false;
[AcceptEncoding] ->
EncodingList = [parse_qval(X) ||
X <- split_sep(AcceptEncoding, $,)],
case [Q || {"gzip", Q} <- EncodingList]
++ [Q || {"*", Q} <- EncodingList] of
[] ->
false;
[Q|_] -> (Q > 100) % just for fun
and not has_buggy_gzip(
H#headers.user_agent, Mime)
end;
_ ->
false
end.
%%% Advice partly taken from Apache's documentation of `mod_deflate'.
% Only Netscape
% 4.06-4.08 is really
% broken.
has_buggy_gzip("Mozilla/4.06"++_, _) ->
true;
has_buggy_gzip("Mozilla/4.07"++_, _) ->
true;
has_buggy_gzip("Mozilla/4.08"++_, _) ->
true;
% Everything else
% handles at least
% HTML.
has_buggy_gzip(_, "text/html") ->
false;
has_buggy_gzip(UserAgent, Mime) ->
UA = parse_ua(UserAgent),
in_ua(fun("Mozilla/4"++_) ->
% Netscape 4.x may
% choke on anything
% not HTML.
case Mime of
% IE doesn't, but some
% versions are said to
% have issues with
% plugins.
"application/pdf" ->
true;
_ -> not in_comment(
fun("MSIE"++_) ->
true;
(_) -> false
end,
UA)
end;
("w3m"++_) ->
% W3m does not
% decompress when
% saving.
true;
("Opera") ->
% Opera 6 does not
% uncompress downloads.
in_ua(fun("6."++_) -> true;
(_) -> false
end, UA);
("Opera/6."++_) ->
true;
(_) ->
false
end,
UA).
%%% Parsing of User-Agent header.
%%% Yes, this looks a bit like overkill.
tokenize_ua([], Acc) ->
lists:reverse(Acc);
tokenize_ua([$\\ , C|T], Acc) ->
tokenize_ua(T, [C|Acc]);
tokenize_ua([$(|T], Acc) ->
tokenize_ua(T, [popen | Acc]);
tokenize_ua([$)|T], Acc) ->
tokenize_ua(T, [pclose | Acc]);
tokenize_ua([C|T], Acc) ->
tokenize_ua(T, [C|Acc]).
parse_ua(Line) ->
case catch parse_ua_l(tokenize_ua(Line, [])) of
{'EXIT', _} -> [];
Res -> Res
end.
parse_ua_l(Line) ->
case drop_spaces(Line) of
[] ->
[];
[popen|T] ->
{Comment, Tail} = parse_comment(T),
[Comment | parse_ua_l(Tail)];
[pclose|T] ->
% Error, ignore
parse_ua_l(T);
L ->
{UA, Tail} = parse_ua1(L),
[UA | parse_ua_l(Tail)]
end.
parse_comment(L) ->
parse_comment(L, [], []).
parse_comment([], _, _) ->
% Error
{error, []};
parse_comment([pclose|T], CAcc, CsAcc) ->
{{comment, lists:reverse([lists:reverse(CAcc)|CsAcc])}, T};
parse_comment([popen|T], CAcc, CsAcc) ->
{Comment, Tail} = parse_comment(T),
parse_comment(drop_spaces(Tail),
[], [Comment, lists:reverse(CAcc) | CsAcc]);
parse_comment([$;|T], CAcc, CsAcc) ->
parse_comment(drop_spaces(T), [], [lists:reverse(CAcc)|CsAcc]);
parse_comment([C|T], CAcc, CsAcc) ->
parse_comment(T, [C|CAcc], CsAcc).
parse_ua1(L) ->
parse_ua1(L, []).
parse_ua1([], Acc) ->
{{ua,lists:reverse(Acc)}, []};