%% ``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.
%%
%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
%% AB. All Rights Reserved.''
%%
%% $Id: mod_head.erl,v 1.1 2008/12/17 09:53:35 mikpe Exp $
-module(mod_head).
-export([do/1]).
-include("httpd.hrl").
%% do
do(Info) ->
?DEBUG("do -> entry",[]),
case Info#mod.method of
"HEAD" ->
case httpd_util:key1search(Info#mod.data,status) of
%% A status code has been generated!
{StatusCode,PhraseArgs,Reason} ->
{proceed,Info#mod.data};
%% No status code has been generated!
_undefined ->
case httpd_util:key1search(Info#mod.data,response) of
%% No response has been generated!
undefined ->
do_head(Info);
%% A response has been sent! Nothing to do about it!
{already_sent,StatusCode,Size} ->
{proceed,Info#mod.data};
%% A response has been generated!
{StatusCode,Response} ->
{proceed,Info#mod.data}
end
end;
%% Not a HEAD method!
_ ->
{proceed,Info#mod.data}
end.
do_head(Info) ->
?DEBUG("do_head -> Request URI: ~p",[Info#mod.request_uri]),
Path = mod_alias:path(Info#mod.data,Info#mod.config_db,
Info#mod.request_uri),
Suffix = httpd_util:suffix(Path),
%% Does the file exists?
case file:read_file_info(Path) of
{ok,FileInfo} ->
MimeType=httpd_util:lookup_mime_default(Info#mod.config_db,Suffix,"text/plain"),
Length=io_lib:write(FileInfo#file_info.size),
Head=[{content_type,MimeType},{content_length,Length},{code,200}],
{proceed,[{response,{response,Head,nobody}}|Info#mod.data]};
{error,Reason} ->
{proceed,
[{status,read_file_info_error(Reason,Info,Path)}|Info#mod.data]}
end.
%% read_file_info_error - Handle file info read failure
%%
read_file_info_error(eacces,Info,Path) ->
read_file_info_error(403,Info,Path,"");
read_file_info_error(enoent,Info,Path) ->
read_file_info_error(404,Info,Path,"");
read_file_info_error(enotdir,Info,Path) ->
read_file_info_error(404,Info,Path,
": A component of the file name is not a directory");
read_file_info_error(emfile,_Info,Path) ->
read_file_info_error(500,none,Path,": To many open files");
read_file_info_error({enfile,_},_Info,Path) ->
read_file_info_error(500,none,Path,": File table overflow");
read_file_info_error(_Reason,_Info,Path) ->
read_file_info_error(500,none,Path,"").
read_file_info_error(StatusCode,none,Path,Reason) ->
{StatusCode,none,?NICE("Can't access "++Path++Reason)};
read_file_info_error(StatusCode,Info,Path,Reason) ->
{StatusCode,Info#mod.request_uri,
?NICE("Can't access "++Path++Reason)}.
