aboutsummaryrefslogtreecommitdiff
path: root/engine/lib/sessions.php
blob: 2995c1723bf91f5796b470f37f377f0ee5c0a50e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
<?php

	/**
	 * Elgg session management
	 * Functions to manage logins
	 * 
	 * @package Elgg
	 * @subpackage Core
	 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
	 * @author Curverider Ltd
	 * @copyright Curverider Ltd 2008
	 * @link http://elgg.org/
	 */

	/**
	 * Returns whether or not the user is currently logged in
	 *
	 * @uses $_SESSION
	 * @return true|false
	 */
		function isloggedin() {
			
			if ((isset($_SESSION['guid'])) && ($_SESSION['guid'] > 0))
				return true;
			return false;
			
		}
		
	/**
	 * Perform standard authentication with a given username and password.
	 * Returns an ElggUser object for use with login.
	 *
	 * @see login
	 * @param string $username The username, optionally (for standard logins)
	 * @param string $password The password, optionally (for standard logins)
	 * @return ElggUser|false The authenticated user object, or false on failure.
	 */
		
		function authenticate($username, $password) {
            
            $dbpassword = md5($password);
            
            if ($user = get_user_by_username($username)) {
                 if ($user->password == $dbpassword) {
                 	return $user;
                 }
            }
            
            return false;
			
		}
		
	/**
	 * Logs in a specified ElggUser. For standard registration, use in conjunction
	 * with authenticate.
	 * 
	 * @see authenticate
	 * @param ElggUser $user A valid Elgg user object
	 * @param boolean $persistent Should this be a persistent login?
	 * @return true|false Whether login was successful
	 */
		function login(ElggUser $user, $persistent = false) {
            
            global $CONFIG;
                 
            $_SESSION['user'] = $user;
            $_SESSION['guid'] = $user->getGUID();
            $_SESSION['id'] = $_SESSION['guid'];
            $_SESSION['username'] = $user->username;
            $_SESSION['name'] = $user->name;
                     
            $code = (md5($user->name . $user->username . time() . rand()));

            $user->code = md5($code);
            
            $_SESSION['code'] = $code;
            
            if (($persistent))
				setcookie("elggperm", $code, (time()+(86400 * 30)),"/");
            
            if (!$user->save() || !trigger_event('login','user',$user)) {
            	unset($_SESSION['username']);
	            unset($_SESSION['name']);
	            unset($_SESSION['code']);
	            unset($_SESSION['guid']);
	            unset($_SESSION['id']);
	            unset($_SESSION['user']);
	            setcookie("elggperm", "", (time()-(86400 * 30)),"/");
            	return false;
            }

			return true;
				
		}
        
	/**
	 * Log the current user out
	 *
	 * @return true|false
	 */
		function logout() {
            global $CONFIG;

            if (isset($_SESSION['user'])) {
            	if (!trigger_event('logout','user',$_SESSION['user'])) return false;
            	$_SESSION['user']->code = "";
            	$_SESSION['user']->save();
            }
            unset($_SESSION['username']);
            unset($_SESSION['name']);
            unset($_SESSION['code']);
            unset($_SESSION['guid']);
            unset($_SESSION['id']);
            unset($_SESSION['user']);
            
            setcookie("elggperm", "", (time()-(86400 * 30)),"/");
            
            return true;
        }
		
	/**
	 * Initialises the system session and potentially logs the user in
	 * 
	 * This function looks for:
	 * 
	 * 1. $_SESSION['id'] - if not present, we're logged out, and this is set to 0
	 * 2. The cookie 'elggperm' - if present, checks it for an authentication token, validates it, and potentially logs the user in 
	 *
	 * @uses $_SESSION
	 * @param unknown_type $event
	 * @param unknown_type $object_type
	 * @param unknown_type $object
	 */
		function session_init($event, $object_type, $object) {
			
			if (!is_db_installed()) return false;
			
			session_name('Elgg');
	        session_start();
	        
	        if (empty($_SESSION['guid'])) {
	            if (isset($_COOKIE['elggperm'])) {            
	                $code = $_COOKIE['elggperm'];
	                $code = md5($code);
	                $_SESSION['guid'] = 0;
	                $_SESSION['id'] = 0;
	                if ($user = get_user_by_code($code)) {
                    	$_SESSION['user'] = $user;
                        $_SESSION['id'] = $user->getGUID();
                        $_SESSION['guid'] = $_SESSION['id'];
                        $_SESSION['code'] = $_COOKIE['elggperm'];
	                }
	            } else {
	                $_SESSION['id'] = 0;
	                $_SESSION['guid'] = 0;
	            }
	        } else {
	            if (!empty($_SESSION['code'])) {
	                $code = md5($_SESSION['code']);
	                if ($user = get_user_by_code($code)) {
	                	$_SESSION['user'] = $user;
	                } else {
	                	unset($_SESSION['user']);
	                	$_SESSION['guid'] = 0;
	                	$_SESSION['id'] = 0;
	                }
	            } else {
	            	$_SESSION['guid'] = 0;
	                $_SESSION['id'] = 0;
	            }
	        }
	        if ($_SESSION['id'] > 0) {
	            // set_last_action($_SESSION['id']);
	        }
	        
	        register_action("login",true);
    		register_action("logout");
	        
		}

	/**
	 * Used at the top of a page to mark it as logged in users only.
	 *
	 */
		function gatekeeper() {
			if (!isloggedin()) forward();
		}
		
		register_event_handler("boot","system","session_init",1);


?>