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-module(mod_http_fileserver_log).
-behaviour(gen_server).
-export([init/1, handle_call/3, handle_cast/2,
handle_info/2, terminate/2, code_change/3]).
-export([start_link/2, start/2, stop/1, add_to_log/4,
reopen_log/1]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-include("ejabberd_http.hrl").
-include_lib("kernel/include/file.hrl").
-define(PROCNAME, ejabberd_mod_http_fileserver_log).
-record(state, {host = <<"">>,
accesslog :: binary(),
accesslogfd :: file:io_device()}).
%% Public API
start(Host, Filename) ->
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
ChildSpec = {Proc,
{?MODULE, start_link, [Host, Filename]},
transient, % if process crashes abruptly, it gets restarted
1000, worker, [?MODULE]},
supervisor:start_child(ejabberd_sup, ChildSpec).
stop(Host) ->
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
gen_server:call(Proc, stop),
supervisor:terminate_child(ejabberd_sup, Proc),
supervisor:delete_child(ejabberd_sup, Proc).
start_link(Host, Filename) ->
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
gen_server:start_link({local, Proc}, ?MODULE,
[Host, Filename], []).
-spec add_to_log(binary(), non_neg_integer(), non_neg_integer(),
http_request()) -> ok.
add_to_log(Host, FileSize, Code, Request) ->
gen_server:cast(gen_mod:get_module_proc(Host,
?PROCNAME),
{add_to_log, FileSize, Code, Request}).
-spec reopen_log(binary()) -> ok.
reopen_log(Host) ->
gen_server:cast(gen_mod:get_module_proc(Host,
?PROCNAME),
reopen_log).
%% Server implementation, a.k.a.: callbacks
init([Host, Filename]) ->
try try_open_log(Filename, Host) of
AccessLogFD ->
?DEBUG("File opened !", []),
{ok,
#state{host = Host, accesslog = Filename,
accesslogfd = AccessLogFD}}
catch
Reason -> {stop, Reason}
end.
try_open_log(FN, Host) ->
FD = try open_log(FN) of
FD1 -> FD1
catch
{cannot_open_accesslog, FN, Reason} ->
?ERROR_MSG("Cannot open access log file: ~p~nReason: ~p",
[FN, Reason]),
undefined
end,
ejabberd_hooks:add(reopen_log_hook, Host, ?MODULE,
reopen_log, 50),
FD.
handle_call(_Request, _From, State) ->
{reply, ok, State}.
handle_cast({add_to_log, FileSize, Code, Request},
State) ->
add_to_log2(State#state.accesslogfd, FileSize, Code,
Request),
{noreply, State};
handle_cast(reopen_log, State) ->
FD2 = reopen_log(State#state.accesslog,
State#state.accesslogfd),
{noreply, State#state{accesslogfd = FD2}};
handle_cast(_Msg, State) -> {noreply, State}.
handle_info(_Info, State) -> {noreply, State}.
terminate(_Reason, State) ->
close_log(State#state.accesslogfd),
ejabberd_hooks:delete(reopen_log_hook, State#state.host,
?MODULE, reopen_log, 50),
ok.
code_change(_OldVsn, State, _Extra) -> {ok, State}.
%%----------------------------------------------------------------------
%% Log file
%%----------------------------------------------------------------------
-spec open_log(binary()) -> file:io_device().
open_log(FN) ->
case file:open(FN, [append]) of
{ok, FD} -> FD;
{error, Reason} ->
throw({cannot_open_accesslog, FN, Reason})
end.
close_log(FD) -> file:close(FD).
reopen_log(undefined, undefined) -> ok;
reopen_log(FN, FD) ->
?DEBUG("reopening logs", []),
close_log(FD),
open_log(FN).
-spec add_to_log2(file:io_device(), non_neg_integer(), non_neg_integer(),
http_request()) -> ok.
add_to_log2(undefined, _FileSize, _Code, _Request) ->
ok;
add_to_log2(File, FileSize, Code, Request) ->
{{Year, Month, Day}, {Hour, Minute, Second}} =
calendar:local_time(),
IP = jlib:ip_to_list(Request#request.ip),
Path = str:join(Request#request.path, <<"/">>),
Query = case str:join(
lists:flatmap(fun ({nokey, []}) ->
[];
({K, V}) ->
[<<K/binary, $=, V/binary>>]
end, Request#request.q),
<<"&">>) of
<<"">> -> <<"">>;
String -> <<$?, String/binary>>
end,
UserAgent = find_header('User-Agent',
Request#request.headers, <<"-">>),
Referer = find_header('Referer',
Request#request.headers, <<"-">>),
io:format(File,
<<"~s - - [~p/~p/~p:~p:~p:~p] \"~s /~s~s\" "
"~p ~p \"~s\" \"~s\"~n">>,
[IP, Day, Month, Year, Hour, Minute, Second,
Request#request.method, Path, Query, Code, FileSize,
escape_quote(Referer), escape_quote(UserAgent)]).
find_header(Header, Headers, Default) ->
case lists:keysearch(Header, 1, Headers) of
{value, {_, Value}} -> Value;
false -> Default
end.
escape_quote(B) ->
escape_quote(B, <<>>).
escape_quote(<<$", Rest/binary>>, Acc) ->
escape_quote(Rest, <<Acc/binary, $\\, $">>);
escape_quote(<<C, Rest/binary>>, Acc) ->
escape_quote(Rest, <<Acc/binary, C>>);
escape_quote(<<>>, Acc) ->
Acc.
|
