%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2010. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%
-module(mod_alias).
-export([do/1,
real_name/3,
real_script_name/3,
default_index/2,
load/2,
store/2,
path/3]).
-include("httpd.hrl").
-include("httpd_internal.hrl").
-define(VMODULE,"ALIAS").
%% do
do(#mod{data = Data} = Info) ->
?hdrt("do", []),
case proplists:get_value(status, Data) of
%% A status code has been generated!
{_StatusCode, _PhraseArgs, _Reason} ->
{proceed, Data};
%% No status code has been generated!
undefined ->
case proplists:get_value(response, Data) of
%% No response has been generated!
undefined ->
do_alias(Info);
%% A response has been generated or sent!
_Response ->
{proceed, Data}
end
end.
do_alias(#mod{config_db = ConfigDB,
request_uri = ReqURI,
data = Data}) ->
{ShortPath, Path, AfterPath} =
real_name(ConfigDB, ReqURI, which_alias(ConfigDB)),
?hdrt("real name",
[{request_uri, ReqURI},
{short_path, ShortPath},
{path, Path},
{after_path, AfterPath}]),
%% Relocate if a trailing slash is missing else proceed!
LastChar = lists:last(ShortPath),
case file:read_file_info(ShortPath) of
{ok, FileInfo} when ((FileInfo#file_info.type =:= directory) andalso
(LastChar =/= $/)) ->
?hdrt("directory and last-char is a /", []),
ServerName = which_server_name(ConfigDB),
Port = port_string( which_port(ConfigDB) ),
URL = "http://" ++ ServerName ++ Port ++ ReqURI ++ "/",
ReasonPhrase = httpd_util:reason_phrase(301),
Message = httpd_util:message(301, URL, ConfigDB),
{proceed,
[{response,
{301, ["Location: ", URL, "\r\n"
"Content-Type: text/html\r\n",
"\r\n",
"<HTML>\n<HEAD>\n<TITLE>",ReasonPhrase,
"</TITLE>\n</HEAD>\n"
"<BODY>\n<H1>",ReasonPhrase,
"</H1>\n", Message,
"\n</BODY>\n</HTML>\n"]}}|
[{real_name, {Path, AfterPath}} | Data]]};
_NoFile ->
{proceed, [{real_name, {Path, AfterPath}} | Data]}
end.
port_string(80) ->
"";
port_string(Port) ->
":" ++ integer_to_list(Port).
%% real_name
real_name(ConfigDB, RequestURI, []) ->
DocumentRoot = which_document_root(ConfigDB),
RealName = DocumentRoot ++ RequestURI,
{ShortPath, _AfterPath} = httpd_util:split_path(RealName),
{Path, AfterPath} =
httpd_util:split_path(default_index(ConfigDB, RealName)),
{ShortPath, Path, AfterPath};
real_name(ConfigDB, RequestURI, [{MP,Replacement}|Rest])
when element(1, MP) =:= re_pattern ->
case re:run(RequestURI, MP, [{capture,[]}]) of
match ->
NewURI = re:replace(RequestURI, MP, Replacement, [{return,list}]),
{ShortPath,_} = httpd_util:split_path(NewURI),
{Path,AfterPath} =
httpd_util:split_path(default_index(ConfigDB, NewURI)),
{ShortPath, Path, AfterPath};
nomatch ->
real_name(ConfigDB, RequestURI, Rest)
end;
real_name(ConfigDB, RequestURI, [{FakeName,RealName}|Rest]) ->
case inets_regexp:match(RequestURI, "^" ++ FakeName) of
{match, _, _} ->
{ok, ActualName, _} = inets_regexp:sub(RequestURI,
"^" ++ FakeName, RealName),
{ShortPath, _AfterPath} = httpd_util:split_path(ActualName),
{Path, AfterPath} =
httpd_util:split_path(default_index(ConfigDB, ActualName)),
{ShortPath, Path, AfterPath};
nomatch ->
real_name(ConfigDB, RequestURI, Rest)
end.
%% real_script_name
real_script_name(_ConfigDB, _RequestURI, []) ->
not_a_script;
real_script_name(ConfigDB, RequestURI, [{MP,Replacement} | Rest])
when element(1, MP) =:= re_pattern ->
case re:run(RequestURI, MP, [{capture,[]}]) of
match ->
ActualName =
re:replace(RequestURI, MP, Replacement, [{return,list}]),
httpd_util:split_script_path(default_index(ConfigDB, ActualName));
nomatch ->
real_script_name(ConfigDB, RequestURI, Rest)
end;
real_script_name(ConfigDB, RequestURI, [{FakeName,RealName} | Rest]) ->
case inets_regexp:match(RequestURI, "^" ++ FakeName) of
{match,_,_} ->
{ok, ActualName, _} =
inets_regexp:sub(RequestURI, "^" ++ FakeName, RealName),
httpd_util:split_script_path(default_index(ConfigDB, ActualName));
nomatch ->
real_script_name(ConfigDB, RequestURI, Rest)
end.
%% default_index
default_index(ConfigDB, Path) ->
case file:read_file_info(Path) of
{ok, FileInfo} when FileInfo#file_info.type =:= directory ->
DirectoryIndex = which_directory_index(ConfigDB),
append_index(Path, DirectoryIndex);
_ ->
Path
end.
append_index(RealName, []) ->
RealName;
append_index(RealName, [Index | Rest]) ->
case file:read_file_info(filename:join(RealName, Index)) of
{error, _Reason} ->
append_index(RealName, Rest);
_ ->
filename:join(RealName, Index)
end.
%% path
path(Data, ConfigDB, RequestURI) ->
case proplists:get_value(real_name, Data) of
undefined ->
DocumentRoot = which_document_root(ConfigDB),
{Path, _AfterPath} =
httpd_util:split_path(DocumentRoot ++ RequestURI),
Path;
{Path, _AfterPath} ->
Path
end.
%%
%% Configuration
%%
%% load
load("DirectoryIndex " ++ DirectoryIndex, []) ->
{ok, DirectoryIndexes} = inets_regexp:split(DirectoryIndex," "),
{ok,[], {directory_index, DirectoryIndexes}};
load("Alias " ++ Alias, []) ->
case inets_regexp:split(Alias," ") of
{ok, [FakeName, RealName]} ->
{ok,[],{alias,{FakeName,RealName}}};
{ok, _} ->
{error,?NICE(httpd_conf:clean(Alias)++" is an invalid Alias")}
end;
load("ReWrite " ++ Rule, Acc) ->
load_re_write(Rule, Acc, "ReWrite", re_write);
load("ScriptAlias " ++ ScriptAlias, []) ->
case inets_regexp:split(ScriptAlias, " ") of
{ok, [FakeName, RealName]} ->
%% Make sure the path always has a trailing slash..
RealName1 = filename:join(filename:split(RealName)),
{ok, [], {script_alias, {FakeName, RealName1++"/"}}};
{ok, _} ->
{error, ?NICE(httpd_conf:clean(ScriptAlias)++
" is an invalid ScriptAlias")}
end;
load("ScriptReWrite " ++ Rule, Acc) ->
load_re_write(Rule, Acc, "ScriptReWrite", script_re_write).
load_re_write(Rule0, Acc, Type, Tag) ->
case lists:dropwhile(
fun ($\s) -> true; ($\t) -> true; (_) -> false end,
Rule0) of
"" ->
{error, ?NICE(httpd_conf:clean(Rule0)++" is an invalid "++Type)};
Rule ->
case string:chr(Rule, $\s) of
0 ->
{ok, Acc, {Tag, {Rule, ""}}};
N ->
{Re, [_|Replacement]} = lists:split(N-1, Rule),
{ok, Acc, {Tag, {Re, Replacement}}}
end
end.
store({directory_index, Value} = Conf, _) when is_list(Value) ->
case is_directory_index_list(Value) of
true ->
{ok, Conf};
false ->
{error, {wrong_type, {directory_index, Value}}}
end;
store({directory_index, Value}, _) ->
{error, {wrong_type, {directory_index, Value}}};
store({alias, {Fake, Real}} = Conf, _)
when is_list(Fake), is_list(Real) ->
{ok, Conf};
store({alias, Value}, _) ->
{error, {wrong_type, {alias, Value}}};
store({re_write, {Re, Replacement}} = Conf, _)
when is_list(Re), is_list(Replacement) ->
case re:compile(Re) of
{ok, MP} ->
{ok, {alias, {MP, Replacement}}};
{error,_} ->
{error, {re_compile, Conf}}
end;
store({re_write, _} = Conf, _) ->
{error, {wrong_type, Conf}};
store({script_alias, {Fake, Real}} = Conf, _)
when is_list(Fake), is_list(Real) ->
{ok, Conf};
store({script_alias, Value}, _) ->
{error, {wrong_type, {script_alias, Value}}};
store({script_re_write, {Re, Replacement}} = Conf, _)
when is_list(Re), is_list(Replacement) ->
case re:compile(Re) of
{ok, MP} ->
{ok, {script_alias, {MP, Replacement}}};
{error,_} ->
{error, {re_compile, Conf}}
end;
store({script_re_write, _} = Conf, _) ->
{error, {wrong_type, Conf}}.
is_directory_index_list([]) ->
true;
is_directory_index_list([Head | Tail]) when is_list(Head) ->
is_directory_index_list(Tail);
is_directory_index_list(_) ->
false.
%% ---------------------------------------------------------------------
which_alias(ConfigDB) ->
httpd_util:multi_lookup(ConfigDB, alias).
which_server_name(ConfigDB) ->
httpd_util:lookup(ConfigDB, server_name).
which_port(ConfigDB) ->
httpd_util:lookup(ConfigDB, port, 80).
which_document_root(ConfigDB) ->
httpd_util:lookup(ConfigDB, document_root, "").
which_directory_index(ConfigDB) ->
httpd_util:lookup(ConfigDB, directory_index, []).
