%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2014. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
-module(httpd_util).
-export([ip_address/2, lookup/2, lookup/3, multi_lookup/2,
lookup_mime/2, lookup_mime/3, lookup_mime_default/2,
lookup_mime_default/3, reason_phrase/1, message/3, rfc1123_date/0,
rfc1123_date/1, day/1, month/1,
flatlength/1, split_path/1, split_script_path/1,
suffix/1, split/3, uniq/1,
make_name/2,make_name/3,make_name/4,strip/1,
hexlist_to_integer/1,integer_to_hexlist/1,
convert_request_date/1,create_etag/1,create_etag/2,
convert_netscapecookie_date/1, enable_debug/1, valid_options/3,
modules_validate/1, module_validate/1,
dir_validate/2, file_validate/2, mime_type_validate/1,
mime_types_validate/1, custom_date/0, error_log/2]).
-export([encode_hex/1, decode_hex/1]).
-include_lib("kernel/include/file.hrl").
ip_address({_,_,_,_} = Address, _IpFamily) ->
{ok, Address};
ip_address({_,_,_,_,_,_,_,_} = Address, _IpFamily) ->
{ok, Address};
ip_address(Host, IpFamily)
when ((IpFamily =:= inet) orelse (IpFamily =:= inet6)) ->
inet:getaddr(Host, IpFamily).
%% lookup
lookup(Table,Key) ->
lookup(Table,Key,undefined).
lookup(Table,Key,Undefined) ->
case catch ets:lookup(Table,Key) of
[{Key,Value}|_] ->
Value;
_->
Undefined
end.
%% multi_lookup
multi_lookup(Table,Key) ->
remove_key(ets:lookup(Table,Key)).
remove_key([]) ->
[];
remove_key([{_Key, Value}| Rest]) ->
[Value | remove_key(Rest)].
%% lookup_mime
lookup_mime(ConfigDB,Suffix) ->
lookup_mime(ConfigDB,Suffix,undefined).
lookup_mime(ConfigDB,Suffix,Undefined) ->
[{mime_types,MimeTypesDB}|_]=ets:lookup(ConfigDB,mime_types),
case ets:lookup(MimeTypesDB,Suffix) of
[] ->
Undefined;
[{Suffix,MimeType}|_] ->
MimeType
end.
%% lookup_mime_default
lookup_mime_default(ConfigDB,Suffix) ->
lookup_mime_default(ConfigDB,Suffix,undefined).
lookup_mime_default(ConfigDB,Suffix,Undefined) ->
[{mime_types,MimeTypesDB}|_]=ets:lookup(ConfigDB,mime_types),
case ets:lookup(MimeTypesDB,Suffix) of
[] ->
case ets:lookup(ConfigDB,default_type) of
[] ->
Undefined;
[{default_type,DefaultType}|_] ->
DefaultType
end;
[{Suffix,MimeType}|_] ->
MimeType
end.
%%% RFC 2616, HTTP 1.1 Status codes
reason_phrase(100) -> "Continue";
reason_phrase(101) -> "Switching Protocols" ;
reason_phrase(200) -> "OK" ;
reason_phrase(201) -> "Created" ;
reason_phrase(202) -> "Accepted" ;
reason_phrase(203) -> "Non-Authoritative Information" ;
reason_phrase(204) -> "No Content" ;
reason_phrase(205) -> "Reset Content" ;
reason_phrase(206) -> "Partial Content" ;
reason_phrase(300) -> "Multiple Choices" ;
reason_phrase(301) -> "Moved Permanently" ;
reason_phrase(302) -> "Moved Temporarily" ;
reason_phrase(303) -> "See Other" ;
reason_phrase(304) -> "Not Modified" ;
reason_phrase(305) -> "Use Proxy" ;
reason_phrase(306) -> "(unused)" ;
reason_phrase(307) -> "Temporary Redirect" ;
reason_phrase(400) -> "Bad Request";
reason_phrase(401) -> "Unauthorized";
reason_phrase(402) -> "Payment Required";
reason_phrase(403) -> "Forbidden" ;
reason_phrase(404) -> "Object Not Found" ;
reason_phrase(405) -> "Method Not Allowed" ;
reason_phrase(406) -> "Not Acceptable" ;
reason_phrase(407) -> "Proxy Authentication Required" ;
reason_phrase(408) -> "Request Time-out" ;
reason_phrase(409) -> "Conflict" ;
reason_phrase(410) -> "Gone" ;
reason_phrase(411) -> "Length Required" ;
reason_phrase(412) -> "Precondition Failed" ;
reason_phrase(413) -> "Request Entity Too Large" ;
reason_phrase(414) -> "Request-URI Too Large" ;
reason_phrase(415) -> "Unsupported Media Type" ;
reason_phrase(416) -> "Requested Range Not Satisfiable" ;
reason_phrase(417) -> "Expectation Failed" ;
reason_phrase(500) -> "Internal Server Error" ;
reason_phrase(501) -> "Not Implemented" ;
reason_phrase(502) -> "Bad Gateway" ;
reason_phrase(503) -> "Service Unavailable" ;
reason_phrase(504) -> "Gateway Time-out" ;
reason_phrase(505) -> "HTTP Version not supported";
%%% RFC 2518, HTTP Extensions for Distributed Authoring -- WEBDAV
reason_phrase(102) -> "Processing";
reason_phrase(207) -> "Multi-Status";
reason_phrase(422) -> "Unprocessable Entity";
reason_phrase(423) -> "Locked";
reason_phrase(424) -> "Failed Dependency";
reason_phrase(507) -> "Insufficient Storage";
%%% (Work in Progress) WebDAV Advanced Collections
reason_phrase(425) -> "";
%%% RFC 2817, HTTP Upgrade to TLS
reason_phrase(426) -> "Upgrade Required";
%%% RFC 3229, Delta encoding in HTTP
reason_phrase(226) -> "IM Used";
reason_phrase(_) -> "Internal Server Error".
%% message
message(301,URL,_) ->
"The document has moved <A HREF=\""++ maybe_encode(URL) ++"\">here</A>.";
message(304, _URL,_) ->
"The document has not been changed.";
message(400, none, _) ->
"Your browser sent a query that this server could not understand. ";
message(400, Msg, _) ->
"Your browser sent a query that this server could not understand. " ++
html_encode(Msg);
message(401, none, _) ->
"This server could not verify that you
are authorized to access the document you
requested. Either you supplied the wrong
credentials (e.g., bad password), or your
browser doesn't understand how to supply
the credentials required.";
message(403,RequestURI,_) ->
"You don't have permission to access " ++
html_encode(RequestURI) ++
" on this server.";
message(404,RequestURI,_) ->
"The requested URL " ++
html_encode(RequestURI) ++
" was not found on this server.";
message(408, Timeout, _) ->
Timeout;
message(412,none,_) ->
"The requested preconditions were false";
message(413, Reason,_) ->
"Entity: " ++ html_encode(Reason);
message(414,ReasonPhrase,_) ->
"Message " ++ html_encode(ReasonPhrase) ++ ".";
message(500,_,ConfigDB) ->
ServerAdmin=lookup(ConfigDB,server_admin,"unknown@unknown"),
"The server encountered an internal error or "
"misconfiguration and was unable to complete "
"your request.<P>Please contact the server administrator "
++ html_encode(ServerAdmin) ++
", and inform them of the time the error occurred "
"and anything you might have done that may have caused the error.";
message(501,{Method, RequestURI, HTTPVersion}, _ConfigDB) ->
if
is_atom(Method) ->
atom_to_list(Method) ++
" to " ++
html_encode(RequestURI) ++
" (" ++ HTTPVersion ++ ") not supported.";
is_list(Method) ->
Method ++
" to " ++
html_encode(RequestURI) ++
" (" ++ HTTPVersion ++ ") not supported."
end;
message(503, String, _ConfigDB) ->
"This service in unavailable due to: " ++ html_encode(String);
message(_, ReasonPhrase, _) ->
html_encode(ReasonPhrase).
maybe_encode(URI) ->
Decoded = try http_uri:decode(URI) of
N -> N
catch
error:_ -> URI
end,
http_uri:encode(Decoded).
html_encode(String) ->
try http_uri:decode(String) of
Decoded when is_list(Decoded) ->
http_util:html_encode(Decoded)
catch
_:_ ->
http_util:html_encode(String)
end.
%%convert_rfc_date(Date)->{{YYYY,MM,DD},{HH,MIN,SEC}}
convert_request_date([D,A,Y,DateType| Rest])->
Func=case DateType of
$\, ->
fun convert_rfc1123_date/1;
$\ ->
fun convert_ascii_date/1;
_ ->
fun convert_rfc850_date/1
end,
case catch Func([D,A,Y,DateType| Rest]) of
{ok, Date} ->
Date;
_Error->
bad_date
end.
convert_rfc850_date(DateStr) ->
[_WeekDay,Date,Time,_TimeZone|_Rest] = string:tokens(DateStr," "),
convert_rfc850_date(Date,Time).
convert_rfc850_date([D1,D2,_,
M,O,N,_,
Y1,Y2|_Rest],[H1,H2,_Col,M1,M2,_Col,S1,S2|_Rest2])->
Year=list_to_integer([50,48,Y1,Y2]),
Day=list_to_integer([D1,D2]),
Month = http_util:convert_month([M,O,N]),
Hour=list_to_integer([H1,H2]),
Min=list_to_integer([M1,M2]),
Sec=list_to_integer([S1,S2]),
{ok,{{Year,Month,Day},{Hour,Min,Sec}}}.
convert_ascii_date([_D,_A,_Y,_SP,
M,O,N,_SP,
D1,D2,_SP,
H1,H2,_Col,
M1,M2,_Col,
S1,S2,_SP,
Y1,Y2,Y3,Y4| _Rest])->
Year=list_to_integer([Y1,Y2,Y3,Y4]),
Day=case D1 of
$\ ->
list_to_integer([D2]);
_->
list_to_integer([D1,D2])
end,
Month=http_util:convert_month([M,O,N]),
Hour=list_to_integer([H1,H2]),
Min=list_to_integer([M1,M2]),
Sec=list_to_integer([S1,S2]),
{ok,{{Year,Month,Day},{Hour,Min,Sec}}}.
convert_rfc1123_date([_D,_A,_Y,_C,_SP,
D1,D2,_SP,
M,O,N,_SP,
Y1,Y2,Y3,Y4,_SP,
H1,H2,_Col,
M1,M2,_Col,
S1,S2|_Rest]) ->
Year=list_to_integer([Y1,Y2,Y3,Y4]),
Day=list_to_integer([D1,D2]),
Month=http_util:convert_month([M,O,N]),
Hour=list_to_integer([H1,H2]),
Min=list_to_integer([M1,M2]),
Sec=list_to_integer([S1,S2]),
{ok,{{Year,Month,Day},{Hour,Min,Sec}}}.
convert_netscapecookie_date(Date)->
case (catch http_util:convert_netscapecookie_date(Date)) of
Ret = {ok, _} ->
Ret;
_ ->
{error,bad_date}
end.
%% rfc1123_date
rfc1123_date() ->
{{YYYY,MM,DD},{Hour,Min,Sec}} = calendar:universal_time(),
DayNumber = calendar:day_of_the_week({YYYY,MM,DD}),
lists:flatten(
io_lib:format("~s, ~2.2.0w ~3.s ~4.4.0w ~2.2.0w:~2.2.0w:~2.2.0w GMT",
[day(DayNumber),DD,month(MM),YYYY,Hour,Min,Sec])).
rfc1123_date(undefined) ->
undefined;
rfc1123_date(LocalTime) ->
{{YYYY,MM,DD},{Hour,Min,Sec}} =
case calendar:local_time_to_universal_time_dst(LocalTime) of
[Gmt] -> Gmt;
[_,Gmt] -> Gmt
end,
DayNumber = calendar:day_of_the_week({YYYY,MM,DD}),
lists:flatten(
io_lib:format("~s, ~2.2.0w ~3.s ~4.4.0w ~2.2.0w:~2.2.0w:~2.2.0w GMT",
[day(DayNumber),DD,month(MM),YYYY,Hour,Min,Sec])).
custom_date() ->
LocalTime = calendar:local_time(),
UniversalTime = calendar:universal_time(),
Minutes = round(diff_in_minutes(LocalTime,UniversalTime)),
{{YYYY,MM,DD},{Hour,Min,Sec}} = LocalTime,
Date =
io_lib:format("~.2.0w/~.3s/~.4w:~.2.0w:~.2.0w:~.2.0w ~c~.2.0w~.2.0w",
[DD,httpd_util:month(MM),YYYY,Hour,Min,Sec,
sign(Minutes), abs(Minutes) div 60,
abs(Minutes) rem 60]),
lists:flatten(Date).
diff_in_minutes(L,U) ->
(calendar:datetime_to_gregorian_seconds(L) -
calendar:datetime_to_gregorian_seconds(U))/60.
sign(Minutes) when Minutes > 0 ->
$+;
sign(_Minutes) ->
$-.
%% uniq
uniq([]) ->
[];
uniq([First,First|Rest]) ->
uniq([First|Rest]);
uniq([First|Rest]) ->
[First|uniq(Rest)].
%% day
day(1) -> "Mon";
day(2) -> "Tue";
day(3) -> "Wed";
day(4) -> "Thu";
day(5) -> "Fri";
day(6) -> "Sat";
day(7) -> "Sun".
%% month
month(1) -> "Jan";
month(2) -> "Feb";
month(3) -> "Mar";
month(4) -> "Apr";
month(5) -> "May";
month(6) -> "Jun";
month(7) -> "Jul";
month(8) -> "Aug";
month(9) -> "Sep";
month(10) -> "Oct";
month(11) -> "Nov";
month(12) -> "Dec".
%% decode_hex
decode_hex(URI) ->
http_uri:decode(URI).
encode_hex(URI) ->
http_uri:encode(URI).
%% flatlength
flatlength(List) ->
flatlength(List, 0).
flatlength([H|T],L) when is_list(H) ->
flatlength(H,flatlength(T,L));
flatlength([H|T],L) when is_binary(H) ->
flatlength(T,L+size(H));
flatlength([_H|T],L) ->
flatlength(T,L+1);
flatlength([],L) ->
L.
%% split_path
split_path(Path) ->
case re:run(Path,"[\?].*\$", [{capture, first}]) of
%% A QUERY_STRING exists!
{match,[{Start,Length}]} ->
{http_uri:decode(string:substr(Path,1,Start)),
string:substr(Path,Start+1,Length)};
%% A possible PATH_INFO exists!
nomatch ->
split_path(Path,[])
end.
split_path([],SoFar) ->
{http_uri:decode(lists:reverse(SoFar)),[]};
split_path([$/|Rest],SoFar) ->
Path=http_uri:decode(lists:reverse(SoFar)),
case file:read_file_info(Path) of
{ok,FileInfo} when FileInfo#file_info.type =:= regular ->
{Path,[$/|Rest]};
{ok, _FileInfo} ->
split_path(Rest,[$/|SoFar]);
{error, _Reason} ->
split_path(Rest,[$/|SoFar])
end;
split_path([C|Rest],SoFar) ->
split_path(Rest,[C|SoFar]).
%% split_script_path
split_script_path(Path) ->
case split_script_path(Path, []) of
{Script, AfterPath} ->
{PathInfo, QueryString} = pathinfo_querystring(AfterPath),
{Script, {PathInfo, QueryString}};
not_a_script ->
not_a_script
end.
pathinfo_querystring(Str) ->
pathinfo_querystring(Str, []).
pathinfo_querystring([], SoFar) ->
{lists:reverse(SoFar), []};
pathinfo_querystring([$?|Rest], SoFar) ->
{lists:reverse(SoFar), Rest};
pathinfo_querystring([C|Rest], SoFar) ->
pathinfo_querystring(Rest, [C|SoFar]).
split_script_path([$?|QueryString], SoFar) ->
Path = http_uri:decode(lists:reverse(SoFar)),
case file:read_file_info(Path) of
{ok,FileInfo} when FileInfo#file_info.type =:= regular ->
{Path, [$?|QueryString]};
{ok, _FileInfo} ->
not_a_script;
{error, _Reason} ->
not_a_script
end;
split_script_path([], SoFar) ->
Path = http_uri:decode(lists:reverse(SoFar)),
case file:read_file_info(Path) of
{ok,FileInfo} when FileInfo#file_info.type =:= regular ->
{Path, []};
{ok, _FileInfo} ->
not_a_script;
{error, _Reason} ->
not_a_script
end;
split_script_path([$/|Rest], SoFar) ->
Path = http_uri:decode(lists:reverse(SoFar)),
case file:read_file_info(Path) of
{ok, FileInfo} when FileInfo#file_info.type =:= regular ->
{Path, [$/|Rest]};
{ok, _FileInfo} ->
split_script_path(Rest, [$/|SoFar]);
{error, _Reason} ->
split_script_path(Rest, [$/|SoFar])
end;
split_script_path([C|Rest], SoFar) ->
split_script_path(Rest,[C|SoFar]).
%% suffix
suffix(Path) ->
case filename:extension(Path) of
[] ->
[];
Extension ->
tl(Extension)
end.
%% strip
strip(Value)->
lists:reverse(remove_ws(lists:reverse(remove_ws(Value)))).
remove_ws([$\s|Rest])->
remove_ws(Rest);
remove_ws([$\t|Rest]) ->
remove_ws(Rest);
remove_ws(Rest) ->
Rest.
%% split
split(String,RegExp,N) ->
{ok, re:split(String, RegExp, [{parts, N}, {return, list}])}.
%% make_name/2, make_name/3
%% Prefix -> string()
%% First part of the name, e.g. "httpd"
%% Addr -> {A,B,C,D} | string() | undefined
%% The address part of the name.
%% e.g. "123.234.55.66" or {123,234,55,66} or "otp.ericsson.se"
%% for a host address or undefined if local host.
%% Port -> integer()
%% Last part of the name, such as the HTTPD server port
%% number (80).
%% Postfix -> Any string that will be added last to the name
%%
%% Example:
%% make_name("httpd","otp.ericsson.se",80) => httpd__otp_ericsson_se__80
%% make_name("httpd",undefined,8088) => httpd_8088
make_name(Prefix,Port) ->
make_name(Prefix,undefined,Port,"").
make_name(Prefix,Addr,Port) ->
make_name(Prefix,Addr,Port,"").
make_name(Prefix, Addr,Port,Postfix) when is_atom(Postfix)->
make_name(Prefix, Addr,Port, atom_to_list(Postfix));
make_name(Prefix,"*",Port,Postfix) ->
make_name(Prefix,undefined,Port,Postfix);
make_name(Prefix,any,Port,Postfix) ->
make_name1(io_lib:format("~s_~w~s",[Prefix,Port,Postfix]));
make_name(Prefix,undefined,Port,Postfix) ->
make_name1(io_lib:format("~s_~w~s",[Prefix,Port,Postfix]));
make_name(Prefix,Addr,Port,Postfix) ->
NameString =
Prefix ++ "__" ++ make_name2(Addr) ++ "__" ++
integer_to_list(Port) ++ Postfix,
make_name1(NameString).
make_name1(String) ->
list_to_atom(lists:flatten(String)).
make_name2({A,B,C,D}) ->
io_lib:format("~w_~w_~w_~w", [A,B,C,D]);
make_name2({A, B, C, D, E, F, G, H}) ->
io_lib:format("~w_~w_~w_~w_~w_~w_~w_~w", [A,B,C,D,E,F,G,H]);
make_name2(Addr) ->
search_and_replace(Addr,$.,$_).
search_and_replace(S,A,B) ->
Fun = fun(What) ->
case What of
A -> B;
O -> O
end
end,
lists:map(Fun,S).
%%----------------------------------------------------------------------
%% Converts a string that constists of 0-9,A-F,a-f to a
%% integer
%%----------------------------------------------------------------------
hexlist_to_integer(List)->
http_util:hexlist_to_integer(List).
%%----------------------------------------------------------------------
%%Converts an integer to an hexlist
%%----------------------------------------------------------------------
integer_to_hexlist(Num) when is_integer(Num) ->
http_util:integer_to_hexlist(Num).
create_etag(FileInfo) ->
create_etag(FileInfo#file_info.mtime,FileInfo#file_info.size).
create_etag({{Year,Month,Day},{Hour,Min,Sec}},Size)->
create_part([Year,Month,Day,Hour,Min,Sec])++io_lib:write(Size);
create_etag(FileInfo,Size)->
create_etag(FileInfo#file_info.mtime,Size).
create_part(Values)->
lists:map(fun(Val0)->
Val=Val0 rem 60,
if
Val=<25 ->
65+Val; % A-Z
Val=<50 ->
72+Val; % a-z
%%Since no date s
true ->
Val-3
end
end,Values).
%%----------------------------------------------------------------------
%% Validate httpd options
%%----------------------------------------------------------------------
modules_validate([]) ->
ok;
modules_validate([Head | Tail]) ->
ok = module_validate(Head),
modules_validate(Tail).
module_validate(Module) when is_atom(Module) ->
case code:which(Module) of
non_existing ->
throw({module_does_not_exist, Module});
_ ->
ok
end;
module_validate(Module) ->
throw({module_name_not_atom, Module}).
dir_validate(ConfDir, Dir) ->
case filelib:is_dir(Dir) of
true ->
ok;
false when is_list(Dir) ->
throw({non_existing, {ConfDir, Dir}});
false ->
throw({ConfDir, Dir})
end.
file_validate(ConfFile, File) ->
case filelib:is_file(File) of
true ->
ok;
false when is_list(File) ->
throw({non_existing, {ConfFile, File}});
false ->
throw({ConfFile, File})
end.
mime_type_validate({Value1, Value2})
when is_list(Value1) andalso is_list(Value2) ->
ok;
mime_type_validate({_, _} = Value) ->
throw({mime_type, Value});
mime_type_validate(MimeFile) ->
file_validate(mime_types, MimeFile).
mime_types_validate([{_, _} = Value | Rest]) ->
ok = mime_types_validate(Value),
mime_types_validate(Rest);
mime_types_validate([]) ->
ok;
mime_types_validate(MimeFile) ->
mime_type_validate(MimeFile).
valid_options(Debug, AcceptTimeout, Config) ->
valid_debug(Debug),
valid_accept_timeout(AcceptTimeout),
valid_config(Config).
valid_debug([]) ->
ok;
valid_debug(disable) ->
ok;
valid_debug(L) when is_list(L) ->
valid_debug2(L);
valid_debug(D) ->
throw({error, {bad_debug_option,D}}).
valid_debug2([{all_functions,L}|Rest]) when is_list(L) ->
try modules_validate(L) of
ok ->
valid_debug2(Rest)
catch
throw:Error ->
throw({error, Error})
end;
valid_debug2([{exported_functions,L}|Rest]) when is_list(L) ->
modules_validate(L),
valid_debug2(Rest);
valid_debug2([{disable,L}|Rest]) when is_list(L) ->
modules_validate(L),
valid_debug2(Rest);
valid_debug2([H|_T]) ->
throw({error,{bad_debug_option,H}});
valid_debug2([]) ->
ok.
valid_accept_timeout(I) when is_integer(I) ->
ok;
valid_accept_timeout(A) ->
throw({error,{bad_debug_option,A}}).
valid_config(_) ->
ok.
%%----------------------------------------------------------------------
%% Enable debugging,
%%----------------------------------------------------------------------
enable_debug([]) ->
ok;
enable_debug(Debug) ->
dbg:tracer(),
dbg:p(all, [call]),
do_enable_debug(Debug).
do_enable_debug(disable) ->
dbg:stop();
do_enable_debug([]) ->
ok;
do_enable_debug([{Level,Modules}|Rest])
when is_atom(Level) andalso is_list(Modules) ->
case Level of
all_functions ->
lists:foreach(
fun(X) ->
dbg:tpl(X, [{'_', [], [{return_trace}]}])
end, Modules);
exported_functions ->
lists:foreach(
fun(X) ->
dbg:tp(X, [{'_', [], [{return_trace}]}])
end, Modules);
disable ->
lists:foreach(
fun(X) ->
dbg:ctp(X)
end, Modules);
_ ->
ok
end,
do_enable_debug(Rest).
error_log(ConfigDb, Error) ->
error_log(mod_log, ConfigDb, Error),
error_log(mod_disk_log, ConfigDb, Error).
error_log(Mod, ConfigDB, Error) ->
Modules = httpd_util:lookup(ConfigDB, modules,
[mod_get, mod_head, mod_log]),
case lists:member(Mod, Modules) of
true ->
Mod:report_error(ConfigDB, Error);
_ ->
ok
end.
