From b57248e82216ffc152db8c6ed06e4e21ccb9a122 Mon Sep 17 00:00:00 2001
From: Badlop <badlop@process-one.net>
Date: Tue, 16 Jun 2009 13:52:12 +0000
Subject: [PATCH] Added accesslog parameter to record requests log in a file
 similar to Apache (thanks to Jerome Sautret)

SVN Revision: 2184
---
 src/web/mod_http_fileserver.erl | 115 +++++++++++++++++++++++++++++---
 1 file changed, 106 insertions(+), 9 deletions(-)

diff --git a/src/web/mod_http_fileserver.erl b/src/web/mod_http_fileserver.erl
index 248870c8e..f04cf113c 100644
--- a/src/web/mod_http_fileserver.erl
+++ b/src/web/mod_http_fileserver.erl
@@ -15,14 +15,16 @@
 -behaviour(gen_mod).
 
 -export([
-	start/2,
-	stop/1,
-	process/2
+	 start/2,
+	 stop/1,
+	 process/2,
+	 ctl_process/2
 	]).
 
 -include("ejabberd.hrl").
 -include("jlib.hrl").
 -include("ejabberd_http.hrl").
+-include("ejabberd_ctl.hrl").
 
 %%%----------------------------------------------------------------------
 %%% REQUEST HANDLERS
@@ -30,7 +32,7 @@
 
 %%-----------------------------------------------------------------------
 %% FUNCTION
-%% 
+%%
 %%   process/2
 %%
 %% PURPOSE
@@ -48,8 +50,21 @@
 %%
 %%-----------------------------------------------------------------------
 
-process(LocalPath, _Request) ->
+
+process(LocalPath, Request) ->
     ?DEBUG("Requested ~p", [LocalPath]),
+
+    Result = serve(LocalPath),
+    case ets:lookup(mod_http_fileserver, accessfile) of
+	undefined ->
+	    ok;
+	[{accessfile, AccessFile}] ->
+	    {Code, _, _} = Result,
+	    log(AccessFile, Code, Request)
+    end,
+    Result.
+
+serve(LocalPath) ->
     [{docroot, DocRoot}] = ets:lookup(mod_http_fileserver, docroot),
     FileName = filename:join(filename:split(DocRoot) ++ LocalPath),
     case file:read_file(FileName) of
@@ -68,11 +83,40 @@ process(LocalPath, _Request) ->
             end
     end.
 
+ctl_process(_Val, ["reopen-weblog"]) ->
+    mod_http_fileserver_server ! reopenlog,
+    ?STATUS_SUCCESS;
+ctl_process(Val, _Args) ->
+	Val.
 
 %%%----------------------------------------------------------------------
 %%% UTILITIES
 %%%----------------------------------------------------------------------
 
+join([], _) ->
+    "";
+join([E], _) ->
+    E;
+join([H | T], Separator) ->
+    lists:foldl(fun(E, Acc) -> lists:concat([Acc, Separator, E]) end, H, T).
+
+log(File, Code, Request) ->
+    {{Year, Month, Day}, {Hour, Minute, Second}} = calendar:local_time(),
+    IP = join(tuple_to_list(Request#request.ip), "."),
+    Path = join(Request#request.path, "/"),
+    Query = case join(lists:map(fun(E) -> lists:concat([element(1, E), "=", element(2, E)]) end,
+				Request#request.q), "&") of
+		[] ->
+		    "";
+		String ->
+		    [$? | String]
+	    end,
+    % combined apache like log format :
+    % 127.0.0.1 - - [28/Mar/2007:18:41:55 +0200] "GET / HTTP/1.1" 302 303 "-" "tsung"
+    % XXX TODO some fields are harcoded/missing (reply size, user agent or referer for example)
+    io:format(File, "~p - - [~p/~p/~p:~p:~p:~p] \"~s /~s~s\" ~p -1 \"-\" \"-\"~n",
+	      [IP, Day, Month, Year, Hour, Minute, Second, Request#request.method, Path, Query, Code]).
+
 content_type(Filename) ->
     case httpd_util:to_lower(filename:extension(Filename)) of
         ".jpg"  -> "image/jpeg";
@@ -88,25 +132,78 @@ content_type(Filename) ->
         _Else   -> "application/octet-stream"
     end.
 
+open_file(Filename) ->
+    case file:open(Filename, [append]) of
+	{ok, File} ->
+	    ets:insert(mod_http_fileserver, {accessfile, File}),
+	    ok;
+	{error, _Reason} ->
+	    {'EXIT', {unaccessible_accessfile, ?MODULE}}
+    end.
+
+loop(Filename) ->
+    receive
+	reopenlog ->
+	    case ets:lookup(mod_http_fileserver, accessfile) of
+		undefined ->
+		    ok;
+		[{accessfile, AccessFile}] ->
+		    file:close(AccessFile),
+		    case open_file(Filename) of
+			ok ->
+			    ok;
+			_ ->
+			    error
+		    end
+	    end,
+	    loop(Filename);
+	stop ->
+	    ok
+    end.
+
 
 %%%----------------------------------------------------------------------
 %%% BEHAVIOUR CALLBACKS
 %%%----------------------------------------------------------------------
 
 start(_Host, Opts) ->
+    ejabberd_ctl:register_commands([{"reopen-weblog", "reopen http fileserver log file"}],
+				   ?MODULE, ctl_process),
     case gen_mod:get_opt(docroot, Opts, undefined) of
         undefined ->
             {'EXIT', {missing_document_root, ?MODULE}};
         DocRoot ->
             case filelib:is_dir(DocRoot) of
                 true ->
-                    ets:new(mod_http_fileserver, [named_table, bag]),
+		    % XXX WARNING, using a single ets table name will
+		    % not work with virtual hosts
+                    ets:new(mod_http_fileserver, [named_table, public]),
                     ets:insert(mod_http_fileserver, [{docroot, DocRoot}]),
-                    ok;
+		    case gen_mod:get_opt(accesslog, Opts, undefined) of
+			undefined ->
+			    ok;
+			Filename ->
+			    % XXX same remark as above for proc name
+			    register(mod_http_fileserver_server, spawn(?MODULE, loop, [Filename])),
+			    open_file(Filename)
+		    end;
                 _Else ->
                     {'EXIT', {unaccessible_document_root, ?MODULE}}
-            end    
+            end
     end.
 
 stop(_Host) ->
-	ok.
+    case ets:info(mod_http_fileserver, name) of
+	undefined ->
+	    ok;
+	_ ->
+	    case ets:lookup(mod_http_fileserver, accessfile) of
+		undefined ->
+		    ok;
+		[{accessfile, AccessFile}] ->
+		    mod_http_fileserver_server ! stop,
+		    file:close(AccessFile)
+	    end,
+	    ets:delete(mod_http_fileserver)
+    end,
+    ok.