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yaws_ls.erl
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yaws_ls.erl
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%%%----------------------------------------------------------------------
%%% File : yaws_ls.erl
%%% Author : Claes Wikstrom <klacke@hyber.org>
%%% Purpose :
%%% Created : 5 Feb 2002 by Claes Wikstrom <klacke@hyber.org>
%%% Modified: 13 Jan 2004 by Martin Bjorklund <mbj@bluetail.com>
%%% Modified: Jan 2006 by Sébastien Bigot <sebastien.bigot@tremplin-utc.net>
%%%----------------------------------------------------------------------
-module(yaws_ls).
-author('klacke@hyber.org').
-include("../include/yaws.hrl").
-include("../include/yaws_api.hrl").
-include("yaws_debug.hrl").
-include_lib("kernel/include/file.hrl").
-export([list_directory/6, out/1]).
-define(FILE_LEN_SZ, 45).
list_directory(_Arg, CliSock, List, DirName, Req, DoAllZip) ->
{abs_path, Path} = Req#http_request.path,
{DirStr, Pos, Direction, Qry} = parse_query(Path),
?Debug("List=~p Dirname~p~n", [List, DirName]),
Descriptions = read_descriptions(DirName),
L0 = lists:zf(
fun(F) ->
File = DirName ++ [$/|F],
FI = file:read_file_info(File),
file_entry(FI, DirName, F, Qry,Descriptions)
end, List),
L1 = lists:keysort(Pos, L0),
L2 = if Direction == normal -> L1;
Direction == reverse -> lists:reverse(L1)
end,
L3 = [Html || {_, _, _, _, Html} <- L2],
Body = [ doc_head(DirStr),
dir_header(DirName,DirStr),
table_head(Direction),
parent_dir(),
if
DoAllZip == true ->
allzip();
DoAllZip == true_nozip ->
[];
true ->
[]
end,
%% if DoAllGZip == true -> alltgz() end,
%% if DoAllBZip2 == true -> alltbz2() end,
%% if DoAllZip == true -> alltgz() end,
%% if DoAllZip == true -> alltbz2() end,
L3,
table_tail(),
dir_footer(DirName),%yaws:address(),
doc_tail()
],
B = list_to_binary(Body),
yaws_server:accumulate_content(B),
yaws_server:deliver_accumulated(CliSock),
yaws_server:done_or_continue().
parse_query(Path) ->
case string:tokens(Path, [$?]) of
[DirStr, [PosC, $=, DirC] = Q] ->
Pos = case PosC of
$N -> 1; % name
$M -> 2; % last modified
$S -> 3; % size
$D -> 4 % Description
end,
Dir = case DirC of
$r -> reverse;
_ -> normal
end,
{DirStr, Pos, Dir, "/?"++Q};
_ ->
{Path, 1, normal, ""}
end.
parse_description(Line) ->
L = string:strip(Line),
Pos = string:chr(L,$ ),
Filename = string:substr(L, 1, Pos-1),
D = string:substr(L,Pos+1),
Description = string:strip(D,left),
{Filename,Description}.
read_descriptions(DirName) ->
File = DirName ++ [$/ | "MANIFEST.txt"],
case file:read_file(File) of
{ok,Bin} -> Lines = string:tokens(binary_to_list(Bin),"\n"),
lists:map(fun parse_description/1,Lines);
_ -> []
end.
get_description(Name,Descriptions) ->
case lists:keysearch(Name,1,Descriptions) of
{value, {_,Description}} -> Description;
_ -> []
end.
doc_head(DirName) ->
HtmlDirName = yaws_api:htmlize(yaws_api:url_decode(DirName)),
?F("<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n"
"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n"
"<html>\n"
" <head>\n"
" <title>Index of ~s</title>\n"
" <style type=\"text/css\">\n"
" img { border: 0; padding: 0 2px; vertical-align: text-bottom; }\n"
" td { font-family: monospace; padding: 2px 3px; text-align:left;\n"
" vertical-align: bottom; white-space: pre; }\n"
" td:first-child { text-align: left; padding: 2px 10px 2px 3px; }\n"
" table { border: 0; }\n"
" </style>\n"
"</head> \n"
"<body>\n",
[HtmlDirName]
).
doc_tail() ->
"</body>\n"
"</html>\n".
table_head(Direction) ->
NextDirection = if Direction == normal -> "r";
Direction == reverse -> "n"
end,
["<table>\n"
" <tr>\n"
" <td><img src=\"/icons/blank.gif\" alt=\" \"/><a href=\"?N=",NextDirection,"\">Name</a></td>\n"
" <td><a href=\"?M=",NextDirection,"\">Last Modified</a></td>\n"
" <td><a href=\"?S=",NextDirection,"\">Size</a></td>\n"
" <td><a href=\"?D=",NextDirection,"\">Description</a></td>\n"
" </tr>\n"
" <tr><th colspan=\"4\"><hr/></th></tr>\n"].
table_tail() ->
" <tr><th colspan=\"4\"><hr/></th></tr>\n"
"</table>\n".
dir_footer(DirName) ->
File = DirName ++ [$/ | "README.txt"],
case file:read_file(File) of
{ok,Bin} -> "<pre>\n" ++ binary_to_list(Bin) ++ "</pre>\n";
_ -> yaws:address()
end.
dir_header(DirName,DirStr) ->
File = DirName ++ [$/ | "HEADER.txt"],
case file:read_file(File) of
{ok,Bin} -> "<pre>\n" ++ binary_to_list(Bin) ++ "</pre>\n";
_ -> HtmlDirName = yaws_api:htmlize(yaws_api:url_decode(DirStr)),
"<h1>Index of " ++ HtmlDirName ++ "</h1>\n"
end.
parent_dir() ->
{Gif, Alt} = list_gif(directory,"."),
?F(" <tr>\n"
" <td><img src=~p alt=~p/><a href=\"..\">Parent Directory</a></td>\n"
" <td></td>\n"
" <td>-</td>\n"
" <td></td>\n"
" </tr>\n",
["/icons/" ++ Gif,
Alt
]).
%% FIXME: would be nice with a good size approx. but it would require
%% a deep scan of possibly the entire docroot, (and also some knowledge
%% about zip's compression ratio in advance...)
allzip() ->
{Gif, Alt} = list_gif(zip,""),
?F(" <tr>\n"
" <td><img src=~p alt=~p/><a href=\"all.zip\">all.zip</a></td>\n"
" <td></td>\n"
" <td>-</td>\n"
" <td>Build a zip archive of current directory</td>\n"
" </tr>\n",
["/icons/" ++ Gif,
Alt]).
%% alltgz() ->
%% {Gif, Alt} = list_gif(zip,""),
%% ?F(" <tr>\n"
%% " <td><img src=~p alt=~p/><a href=\"all.tgz\">all.tgz</a></td>\n"
%% " <td></td>\n"
%% " <td>-</td>\n"
%% " <td>Build a gzip archive of current directory</td>\n"
%% " </tr>\n",
%% ["/icons/" ++ Gif,
%% Alt]).
%% alltbz2() ->
%% {Gif, Alt} = list_gif(zip,""),
%% ?F(" <tr>\n"
%% " <td><img src=~p alt=~p/><a href=\"all.tbz2\">all.tbz2</a></td>\n"
%% " <td></td>\n"
%% " <td>-</td>\n"
%% " <td>Build a bzip2 archive of current directory</td>\n"
%% " </tr>\n",
%% ["/icons/" ++ Gif,
%% Alt]).
is_user_dir(SP) ->
case SP of
[$/,$~ | T] -> User = string:sub_word(T,1,$/),
case catch yaws:user_to_home(User) of
{'EXIT', _} ->
false;
Home ->
{true,Home}
end;
_ -> false
end.
out(A) ->
SP = A#arg.server_path,
PP = A#arg.appmod_prepath,
Dir = case is_user_dir(SP) of
{true,Home} -> Home ++ "/public_html";
false -> A#arg.docroot
end ++ PP,
%% {html,?F("<h2>~p</h2>",[Dir])}.
YPid = self(),
Forbidden_Paths = accumulate_forbidden_paths(),
case filename:basename(A#arg.server_path) of
"all.zip" -> spawn_link(fun() -> zip(YPid, Dir, Forbidden_Paths) end),
{streamcontent, "application/zip", ""}
%% "all.tgz" -> spawn_link(fun() -> tgz(YPid, Dir) end),
%% {streamcontent, "application/gzip", ""};
%% "all.tbz2" -> spawn_link(fun() -> tbz2(YPid, Dir) end),
%% {streamcontent, "application/gzip", ""}
end.
generate_random_fn() ->
Bytes = try crypto:rand_bytes(64) of
B when is_bitstring(B) ->
B
catch _:_ ->
%% for installations without crypto
<< <<(random:uniform(256) - 1)>> || _ <- lists:seq(1,64) >>
end,
<< Int:512/unsigned-big-integer >> = << Bytes/binary >>,
integer_to_list(Int).
mktempfilename([]) ->
{error, no_temp_dir};
mktempfilename([Dir|R]) ->
RandomFN = generate_random_fn(),
Filename = filename:join(Dir, RandomFN),
case file:open(Filename, [write]) of
{ok, FileHandle} ->
{ok, {Filename, FileHandle}};
_Else ->
mktempfilename(R)
end.
mktempfilename() ->
%% TODO: Add code to determine the temporary directory on various
%% operating systems.
PossibleDirs = ["/tmp", "/var/tmp"],
mktempfilename(PossibleDirs).
zip(YPid, Dir, ForbiddenPaths) ->
{ok, RE_ForbiddenNames} = re:compile("\\.yaws\$"),
Files = dig_through_dir(Dir, ForbiddenPaths, RE_ForbiddenNames),
{ok, {Tempfile, TempfileH}} = mktempfilename(),
file:write(TempfileH, lists:foldl(fun(I, Acc) ->
Acc ++ I ++ "\n"
end, [], Files)),
file:close(TempfileH),
process_flag(trap_exit, true),
%% TODO: find a way to directly pass the list of files to
%% zip. Erlang ports do not allow stdin to be closed
%% independently; however, zip needs stdin to be closed as an
%% indicator that the list of files is complete.
P = open_port({spawn, "zip -q -1 - -@ < " ++ Tempfile},
[{cd, Dir},use_stdio, binary, exit_status]),
F = fun() ->
file:delete(Tempfile)
end,
stream_loop(YPid, P, F).
accumulate_forbidden_paths() ->
SC = get(sc),
Auth = SC#sconf.authdirs,
lists:foldl(fun({Path, _Auth}, Acc) ->
Acc ++ [Path]
end, [], Auth).
%% tgz(YPid, Dir) ->
%% process_flag(trap_exit, true),
%% P = open_port({spawn, "tar cz ."},
%% [{cd, Dir},use_stdio, binary, exit_status]),
%% stream_loop(YPid, P).
%% tbz2(YPid, Dir) ->
%% process_flag(trap_exit, true),
%% P = open_port({spawn, "tar cj ."},
%% [{cd, Dir},use_stdio, binary, exit_status]),
%% stream_loop(YPid, P).
dir_contains_indexfile(_Dir, []) ->
false;
dir_contains_indexfile(Dir, [File|R]) ->
case file:read_file_info(filename:join(Dir, File)) of
{ok, _} ->
true;
_Else ->
dir_contains_indexfile(Dir, R)
end.
dir_contains_indexfile(Dir) ->
Indexfiles = [".yaws.auth", "index.yaws", "index.html", "index.htm"],
dir_contains_indexfile(Dir, Indexfiles).
dig_through_dir(Basedirlen, Dir, ForbiddenPaths, RE_ForbiddenNames) ->
Dir1 = string:sub_string(Dir, Basedirlen),
case {lists:member(Dir1, ForbiddenPaths),
dir_contains_indexfile(Dir)} of
{true,_} ->
[];
{_,true} ->
[];
{false, false} ->
{ok, Files} = file:list_dir(Dir),
lists:foldl(fun(I, Acc) ->
Filename = filename:join(Dir, I),
case {file:read_file_info(Filename),
re:run(Filename, RE_ForbiddenNames)} of
{_, {match, _}} ->
Acc;
{{ok, #file_info{type=directory}}, _} ->
Acc ++ dig_through_dir(
Basedirlen,
Filename,
ForbiddenPaths,
RE_ForbiddenNames);
{{ok, #file_info{type=regular}}, _} ->
Acc ++ [string:sub_string(
Filename, Basedirlen)];
_Else ->
Acc %% Ignore other files
end
end, [], Files)
end.
dig_through_dir(Dir, ForbiddenPaths, RE_ForbiddenNames) ->
dig_through_dir(length(Dir) + 1,
Dir,
ForbiddenPaths,
RE_ForbiddenNames).
stream_loop(YPid, P, FinishedFun) ->
receive
{P, {data, Data}} ->
yaws_api:stream_chunk_deliver_blocking(YPid, Data),
stream_loop(YPid, P, FinishedFun);
{P, {exit_status, _}} ->
yaws_api:stream_chunk_end(YPid),
FinishedFun();
{'EXIT', YPid, Status} ->
FinishedFun(),
exit(Status);
Else ->
FinishedFun(),
error_logger:error_msg("Could not deliver zip file: ~p\n", [Else])
end.
%% Removed code that appendended Qry to the file name.
%% It might still be a good idea in case type==directory.
%% Was that the intention?
%% Carsten
%%
%% yes, that was the intention. fixed now (mbj)
%% ... and maybe we should just remove this conversation in the next checkin :)
file_entry({ok, FI}, _DirName, Name, Qry, Descriptions) ->
?Debug("file_entry(~p) ", [Name]),
Ext = filename:extension(Name),
{Gif, Alt} = list_gif(FI#file_info.type, Ext),
QryStr = if FI#file_info.type == directory -> Qry;
true -> ""
end,
Description = get_description(Name,Descriptions),
Entry =
?F(" <tr>\n"
" <td><img src=~p alt=~p/><a href=~p title=~p>~s</a></td>\n"
" <td>~s</td>\n"
" <td>~s</td>\n"
" <td>~s</td>\n"
" </tr>\n",
["/icons/" ++ Gif,
Alt,
yaws_api:url_encode(Name) ++ QryStr,
Name,
trim(Name,?FILE_LEN_SZ),
datestr(FI),
sizestr(FI),
Description]),
?Debug("Entry:~p", [Entry]),
{true, {Name, FI#file_info.mtime, FI#file_info.size, Description, Entry}};
file_entry(_Err, _, _Name, _, _) ->
?Debug("no entry for ~p: ~p", [_Name, _Err]),
false.
trim(L,N) ->
trim(L,N,[]).
trim([_H1,_H2,_H3]=[H|T], 3=I, Acc) ->
trim(T, I-1, [H|Acc]);
trim([_H1,_H2,_H3|_T], 3=_I, Acc) ->
lists:reverse(Acc) ++ "..>";
trim([H|T], I, Acc) ->
trim(T, I-1, [H|Acc]);
trim([], _I, Acc) ->
lists:reverse(Acc).
%% FI -> 16-Jan-2006 23:06
datestr(FI) ->
{{Year, Month, Day}, {Hour, Min, _}} = FI#file_info.mtime,
io_lib:format("~s-~s-~w ~s:~s",
[yaws:mk2(Day),yaws:month(Month),Year,
yaws:mk2(Hour),yaws:mk2(Min)]).
sizestr(FI) when FI#file_info.size > 1000000 ->
?F("~.1fM", [FI#file_info.size / 1000000]);
sizestr(FI) when FI#file_info.size > 1000 ->
?F("~wk", [trunc(FI#file_info.size / 1000)]);
sizestr(FI) when FI#file_info.size == 0 ->
?F("0k", []);
sizestr(_FI) ->
?F("1k", []). % As apache does it...
list_gif(directory, ".") ->
{"back.gif", "[DIR]"};
list_gif(regular, ".txt") ->
{"text.gif", "[TXT]"};
list_gif(regular, ".c") ->
{"c.gif", "[ ]"};
list_gif(regular, ".dvi") ->
{"dvi.gif", "[ ]"};
list_gif(regular, ".pdf") ->
{"pdf.gif", "[ ]"};
list_gif(regular, _) ->
{"layout.gif", "[ ]"};
list_gif(directory, _) ->
{"dir.gif", "[DIR]"};
list_gif(zip, _) ->
{"compressed.gif", "[DIR]"};
list_gif(_, _) ->
{"unknown.gif", "[OTH]"}.