% coding: utf-8
% Copyright 2008 Grégory Burri
%
% This file is part of Euphorik.
%
% Euphorik is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% Euphorik is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with Euphorik.  If not, see <http://www.gnu.org/licenses/>.
%
% This module responds to JSON requests via 'AJAX'.
% It's defined as an Yaws 'appmods' with the url '/request'.
% For instance in debug mode 'http://localhost:8090/request' will call the out/1 function.


-module(euphorik_requests).
-author("Greg Burri <greg.burri@gmail.com>").
-export([out/1]).
-include_lib("yaws_api.hrl").
-include("../include/euphorik_defines.hrl").


% Entry point for all AJAX requests on '/request'.
out(A) ->
   IP = case inet:peername(A#arg.clisock) of
      {ok, {Address, _Port}} -> Address;
      _ -> unknown
   end,
   % active: to receive {tcp_closed, _} when the socket is closing.
   % keepalive: avoid firewalls to cut the connection.

   inet:setopts(A#arg.clisock, [{active, true}, {keepalive, true}]),
   {value, {_, Contenu}} = lists:keysearch("action", 1, yaws_api:parse_post(A)),

   Ret = traiter_message(Contenu, IP),
   {content, "application/json", Ret}.


% Décode le message JSON.
traiter_message(Contenu, IP) ->
   % extrait l'entête obligatoire des messages JSON
   {ok, {struct, [{"header", {struct, [{"action", Action}, {"version", Version_client}]}} | Reste]}} = json2:decode_string(Contenu),

   json2:encode(
      if Version_client =:= ?VERSION_PROTOCOLE ->
            traiter_action(Action, Reste, IP);
         true ->
            euphorik_protocole:erreur(lists:flatten(io_lib:format(
               "La version du protocole du client (~w) ne correspond à celle du serveur (~w)", [Version_client, ?VERSION_PROTOCOLE]
            )))
      end
   ).


% Authentification d'un client.
traiter_action("authentification", JSON, IP) ->
   euphorik_protocole:login(JSON, IP);
% Un client s'enregistre : (pseudo + password) ou de manière anonyme.
traiter_action("register", JSON, IP) ->
   euphorik_protocole:register(JSON, IP);
% Modification du profile.
traiter_action("set_profile", JSON, _) ->
   euphorik_protocole:profile(JSON);
% Un utilisateur attend un événement (par exemple l'arrivée d'un nouveau message).
traiter_action("wait_event", JSON, _) ->
   euphorik_protocole:wait_event(JSON);
% Un utilisateur envoie un message.
traiter_action("put_message", JSON, _) ->
   euphorik_protocole:put_message(JSON);
% Un ekMaster bannie un utilisateur (ip).
traiter_action("ban", JSON, _) ->
   euphorik_protocole:ban(JSON);
% Un ekMaster slap un utilisateur.
traiter_action("slap", JSON, _) ->
   euphorik_protocole:slap(JSON);
% Un ekMaster demande la liste des ips bannies.
traiter_action("list_banned_ips", JSON, _) ->
   euphorik_protocole:list_banned_ips(JSON);
% Un ekMaster débannie une ip.
traiter_action("unban", JSON, _) ->
   euphorik_protocole:unban_ip(JSON).