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%% ``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_browser.erl,v 1.1 2008/12/17 09:53:35 mikpe Exp $
%%
%% ----------------------------------------------------------------------
%%
%% Browsers sends a string to the webbserver
%% to identify themsevles. They are a bit nasty
%% since the only thing that the specification really
%% is strict about is that they shall be short
%% tree axamples:
%%
%% Netscape Mozilla/4.75 [en] (X11; U; SunOS 5.8 sun4u)
%% IE5 Mozilla/4.0 (compatible; MSIE 5.0; SP1B; SunOS 5.8 sun4u; X11)
%% Lynx Lynx/2.8.3rel.1 libwww-FM/2.142
%%
%% ----------------------------------------------------------------------
-module(mod_browser).
%% Remember that the order of the mozilla browsers are
%% important since some browsers include others to behave
%% as they were something else
-define(MOZILLA_BROWSERS,[{opera,"opera"},{msie,"msie"}]).
%% If your operatingsystem is not recognized add it to this list.
-define(OPERATIVE_SYSTEMS,[{win3x,["win16","windows 3","windows 16-bit"]},
{win95,["win95","windows 95"]},
{win98,["win98", "windows 98"]},
{winnt,["winnt", "windows nt"]},
{win2k,["nt 5"]},
{sunos4,["sunos 4"]},
{sunos5,["sunos 5"]},
{sun,["sunos"]},
{aix,["aix"]},
{linux,["linux"]},
{sco,["sco","unix_sv"]},
{freebsd,["freebsd"]},
{bsd,["bsd"]}]).
-define(LYNX,lynx).
-define(MOZILLA,mozilla).
-define(EMACS,emacs).
-define(STAROFFICE,soffice).
-define(MOSAIC,mosaic).
-define(NETSCAPE,netscape).
-define(UNKOWN,unknown).
-include("httpd.hrl").
-export([do/1, test/0, getBrowser/1]).
do(Info) ->
case httpd_util:key1search(Info#mod.data,status) of
{Status_code,PhraseArgs,Reason} ->
{proceed,Info#mod.data};
undefined ->
{proceed,[{'user-agent',getBrowser1(Info)}|Info#mod.data]}
end.
getBrowser1(Info) ->
PHead=Info#mod.parsed_header,
case httpd_util:key1search(PHead,"User-Agent") of
undefined->
undefined;
AgentString ->
getBrowser(AgentString)
end.
getBrowser(AgentString) ->
LAgentString = httpd_util:to_lower(AgentString),
case regexp:first_match(LAgentString,"^[^ ]*") of
{match,Start,Length} ->
Browser=lists:sublist(LAgentString,Start,Length),
case browserType(Browser) of
{mozilla,Vsn} ->
{getMozilla(LAgentString,
?MOZILLA_BROWSERS,{?NETSCAPE,Vsn}),
operativeSystem(LAgentString)};
AnyBrowser ->
{AnyBrowser,operativeSystem(LAgentString)}
end;
nomatch ->
browserType(LAgentString)
end.
browserType([$l,$y,$n,$x|Version]) ->
{?LYNX,browserVersion(Version)};
browserType([$m,$o,$z,$i,$l,$l,$a|Version]) ->
{?MOZILLA,browserVersion(Version)};
browserType([$e,$m,$a,$c,$s|Version]) ->
{?EMACS,browserVersion(Version)};
browserType([$e,$t,$a,$r,$o,$f,$f,$i,$c,$e|Version]) ->
{?STAROFFICE,browserVersion(Version)};
browserType([$m,$o,$s,$a,$i,$c|Version]) ->
{?MOSAIC,browserVersion(Version)};
browserType(Unknown)->
unknown.
browserVersion([$/|VsnString]) ->
case catch list_to_float(VsnString) of
Number when float(Number) ->
Number;
Whatever ->
case string:span(VsnString,"1234567890.") of
0 ->
unknown;
VLength ->
Vsn = string:substr(VsnString,1,VLength),
case string:tokens(Vsn,".") of
[Number] ->
list_to_float(Number++".0");
[Major,Minor|_MinorMinor] ->
list_to_float(Major++"."++Minor)
end
end
end;
browserVersion(VsnString) ->
browserVersion([$/|VsnString]).
operativeSystem(OpString) ->
operativeSystem(OpString, ?OPERATIVE_SYSTEMS).
operativeSystem(OpString,[]) ->
unknown;
operativeSystem(OpString,[{RetVal,RegExps}|Rest]) ->
case controlOperativeSystem(OpString,RegExps) of
true->
RetVal;
_ ->
operativeSystem(OpString,Rest)
end.
controlOperativeSystem(OpString,[]) ->
false;
controlOperativeSystem(OpString,[Regexp|Regexps]) ->
case regexp:match(OpString,Regexp) of
{match,_,_}->
true;
nomatch->
controlOperativeSystem(OpString,Regexps)
end.
%% OK this is ugly but thats the only way since
%% all browsers dont conform to the name/vsn standard
%% First we check if it is one of the browsers that
%% not are the default mozillaborwser against the regexp
%% for the different browsers. if no match it a mozilla
%% browser i.e opera netscape or internet explorer
getMozilla(AgentString,[],Default) ->
Default;
getMozilla(AgentString,[{Agent,AgentRegExp}|Rest],Default) ->
case regexp:match(AgentString,AgentRegExp) of
{match,_,_} ->
{Agent,getVersion(AgentString,AgentRegExp)};
nomatch ->
getMozilla(AgentString,Rest,Default)
end.
getVersion(AgentString,AgentRegExp) ->
case regexp:match(AgentString,AgentRegExp++"[0-9\.\ ]*") of
{match,Start,Length} when length(AgentRegExp) < Length ->
%% Ok we got the number split it out
RealStart=Start+length(AgentRegExp),
RealLength=Length-length(AgentRegExp),
VsnString=string:substr(AgentString,RealStart,RealLength),
case string:strip(VsnString,both,$\ ) of
[] ->
unknown;
Vsn ->
case string:tokens(Vsn,".") of
[Number]->
list_to_float(Number++".0");
[Major,Minor|_MinorMinor]->
list_to_float(Major++"."++Minor)
end
end;
nomatch ->
unknown
end.
test()->
io:format("~n--------------------------------------------------------~n"),
Res1=getBrowser("Mozilla/4.75 [en] (X11; U; SunOS 5.8 sun4u)"),
io:format("~p",[Res1]),
io:format("~n--------------------------------------------------------~n"),
io:format("~n--------------------------------------------------------~n"),
Res2=getBrowser("Mozilla/4.0 (compatible; MSIE 5.0; SP1B; SunOS 5.8 sun4u; X11)"),
io:format("~p",[Res2]),
io:format("~n--------------------------------------------------------~n"),
io:format("~n--------------------------------------------------------~n"),
Res3=getBrowser("Lynx/2.8.3rel.1 libwww-FM/2.142"),
io:format("~p",[Res3]),
io:format("~n--------------------------------------------------------~n").
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