modules/erl/euphorik_requests.erl

   1 % coding: utf-8
   2 % Copyright 2008 Grégory Burri
   3 %
   4 % This file is part of Euphorik.
   5 %
   6 % Euphorik is free software: you can redistribute it and/or modify
   7 % it under the terms of the GNU General Public License as published by
   8 % the Free Software Foundation, either version 3 of the License, or
   9 % (at your option) any later version.
  10 %
  11 % Euphorik is distributed in the hope that it will be useful,
  12 % but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 % GNU General Public License for more details.
  15 %
  16 % You should have received a copy of the GNU General Public License
  17 % along with Euphorik.  If not, see <http://www.gnu.org/licenses/>.
  18 %
  19 % This module responds to JSON requests via 'AJAX'.
  20 % It's defined as an Yaws 'appmods' with the url '/request'.
  21 % For instance in debug mode 'http://localhost:8090/request' will call the out/1 function.
  22 % @author G.Burri
  23
  24
  25 -module(euphorik_requests).
  26 -export([out/1]).
  27 -include_lib("yaws_api.hrl").
  28 -include("../include/euphorik_defines.hrl").
  29
  30
  31 % Entry point for all AJAX requests on '/request'.
  32 out(A) ->
  33    IP = case inet:peername(A#arg.clisock) of
  34       {ok, {Address, _Port}} -> Address;
  35       _ -> unknown
  36    end,
  37    % active: to receive {tcp_closed, _} when the socket is closing.
  38    % keepalive: avoid firewalls to cut the connection.
  39    inet:setopts(A#arg.clisock, [{active, true}, {keepalive, true}]),
  40    {value, {_, Contenu}} = lists:keysearch("action", 1, yaws_api:parse_post(A)),
  41    Ret = traiter_message(Contenu, IP),
  42    {content, "application/json", Ret}.
  43
  44
  45 % Décode le message JSON.
  46 traiter_message(Contenu, IP) ->
  47    % extrait l'entête obligatoire des messages JSON
  48    {ok, {struct, [{header, {struct, [{action, Action}, {version, Version_client}]}} | Reste]}} = json:decode_string(Contenu),
  49    json:encode(
  50       if Version_client =:= ?VERSION_PROTOCOLE ->
  51             traiter_action(Action, Reste, IP);
  52          true ->
  53             euphorik_protocole:erreur(lists:flatten(io_lib:format(
  54                "La version du protocole du client (~w) ne correspond à celle du serveur (~w)", [Version_client, ?VERSION_PROTOCOLE]
  55             )))
  56       end
  57    ).
  58
  59
  60 % Authentification d'un client.
  61 traiter_action("authentification", JSON, IP) ->
  62    euphorik_protocole:login(JSON, IP);
  63 % Un client s'enregistre : (pseudo + password) ou de manière anonyme.
  64 traiter_action("register", JSON, IP) ->
  65    euphorik_protocole:register(JSON, IP);
  66 % Modification du profile.
  67 traiter_action("set_profile", JSON, _) ->
  68    euphorik_protocole:profile(JSON);
  69 % Un utilisateur attend un événement (par exemple l'arrivée d'un nouveau message).
  70 traiter_action("wait_event", JSON, _) ->
  71    euphorik_protocole:wait_event(JSON);
  72 % Un utilisateur envoie un message.
  73 traiter_action("put_message", JSON, _) ->
  74    euphorik_protocole:put_message(JSON);
  75 % Un ekMaster bannie un utilisateur (ip).
  76 traiter_action("ban", JSON, _) ->
  77    euphorik_protocole:ban(JSON);
  78 % Un ekMaster slap un utilisateur.
  79 traiter_action("slap", JSON, _) ->
  80    euphorik_protocole:slap(JSON);
  81 % Un ekMaster demande la liste des ips bannies.
  82 traiter_action("list_banned_ips", JSON, _) ->
  83    euphorik_protocole:list_banned_ips(JSON);
  84 % Un ekMaster débannie une ip.
  85 traiter_action("unban", JSON, _) ->
  86    euphorik_protocole:unban_ip(JSON).