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  1. PO
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    <p>I tend to roll my own simple authentication library. </p> <p>Firstly, this is the authentication library. It keeps a user ID token in the session. When authenticating it checks for the existence of this token.</p> <p><strong>application/libraries/Auth.php</strong></p> <pre><code>class Auth { var $ci; var $user_id; function Auth() { // Get CodeIgniter instance $this-&gt;ci = get_instance(); // Fetch token from the session $this-&gt;user_id = $this-&gt;ci-&gt;session-&gt;userdata('user_id'); } function check() { return $this-&gt;user_id != null; } function login($user_id) { // Set token in the session $this-&gt;ci-&gt;session-&gt;set_userdata('user_id', $user_id); $this-&gt;user_id = $user_id; } function logout() { // Remove token from the session $this-&gt;ci-&gt;session-&gt;unset_userdata('user_id'); $this-&gt;user_id = null; } } </code></pre> <p>I create my own base controller and authenticate there. For convenience, if authenticated, the base controller loads and stores the current user.</p> <p><strong>application/libraries/MY_Controller.php</strong></p> <pre><code>class MY_Controller extends Controller { var $user; function MY_Controller() { parent::Controller(); } function do_auth() { if ($this-&gt;auth-&gt;check()) { // Authenticated. Fetch current user $this-&gt;user = $this-&gt;user_model-&gt;get_user($this-&gt;auth-&gt;user_id); } else { // Not authenticated. Redirect to login page redirect('users/login'); } } } </code></pre> <p>Then in any action I can call the authentication function of the base controller.</p> <pre><code>class Items extends MY_Controller { function Items() { parent::MY_Controller(); } function create() { // Do authentication $this-&gt;do_auth(); // Continue with handling request } } </code></pre> <p>If I like I can also secure an entire controller.</p> <pre><code>class Items extends MY_Controller { function Items() { parent::MY_Controller(); // Secure entire controller $this-&gt;do_auth(); } } </code></pre> <p>I place the login and logout actions in a users controller. In the login action I verify the user's credentials and log in the user.</p> <pre><code>class Users extends MY_Controller { function Users() { parent::MY_Controller(); } function login() { // Verify form input $this-&gt;load-&gt;library('form_validation'); $this-&gt;form_validation-&gt;set_rules('username', 'Username', 'required'); $this-&gt;form_validation-&gt;set_rules('password', 'Password', 'required'); if ($this-&gt;form_validation-&gt;run()) { // Fetch the user based on credentials supplied $user = $this-&gt;user_model-&gt;get_user_by_credentials($this-&gt;input-&gt;post('username', true), $this-&gt;input-&gt;post('password', true)); if ($user != null) { // Credentials verified. Log the user in. $this-&gt;auth-&gt;login($user-&gt;user_id); redirect(''); } else { // Login failed. Show the login page. $this-&gt;load-&gt;view('users/login', array('login_failed' =&gt; true)); } } else { // Yet to authenticate. Show the login page. $this-&gt;load-&gt;view('users/login', array('login_failed' =&gt; false)); } } function logout() { $this-&gt;auth-&gt;logout(); redirect('users/login'); } } </code></pre>
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    1. POCan anyone recommend an authentication library for CodeIgniter 1.7.x?
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    1. USStephen Curran
    1. USStephen Curran
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      1. VTUpMod
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    1. COWhy are you extending the controller for things that should be done in the login function or a library?
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      1. USTom Schlick
    2. COI could have done it that way. But then the authentication library would have needed to redirect to my specific login page. I considered this more the concern of my application controller. I thought the authentication library should just be concerned with checking for the existence of the token.
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      1. USStephen Curran
    3. COOh ok, the approach i normally take is to record the page they tried to access, redirect them to login/register, after successful login they are directed back to the original page. But your solution works also... ill keep it in mind :)
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