104 lines
3.2 KiB
PHP
104 lines
3.2 KiB
PHP
<?php
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//signin.php
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include 'connect.php';
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include 'header.php';
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echo '<h3>Sign in</h3><br />';
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//first, check if the user is already signed in. If that is the case, there is no need to display this page
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if(isset($_SESSION['signedIn']) && $_SESSION['signedIn'] == true)
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{
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echo 'You are already signed in, you can <a href="signout.php">sign out</a> if you want.';
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}
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else
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{
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if($_SERVER['REQUEST_METHOD'] != 'POST')
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{
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/*the form hasn't been posted yet, display it
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note that the action="" will cause the form to post to the same page it is on */
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echo '<form method="post" action="">
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Username: <input type="text" name="userName" /><br />
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Password: <input type="password" name="userPass"><br />
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<input type="submit" value="Sign in" />
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</form>';
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}
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else
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{
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/* so, the form has been posted, we'll process the data in three steps:
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1. Check the data
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2. Let the user refill the wrong fields (if necessary)
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3. Varify if the data is correct and return the correct response
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*/
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$errors = array(); /* declare the array for later use */
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if(!isset($_POST['userName']))
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{
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$errors[] = 'The username field must not be empty.';
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}
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if(!isset($_POST['userPass']))
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{
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$errors[] = 'The password field must not be empty.';
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}
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if(!empty($errors)) /*check for an empty array, if there are errors, they're in this array (note the ! operator)*/
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{
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echo 'Uh-oh.. a couple of fields are not filled in correctly..<br /><br />';
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echo '<ul>';
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foreach($errors as $key => $value) /* walk through the array so all the errors get displayed */
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{
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echo '<li>' . $value . '</li>'; /* this generates a nice error list */
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}
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echo '</ul>';
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}
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else
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{
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//the form has been posted without errors, so save it
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//notice the use of mysql_real_escape_string, keep everything safe!
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//also notice the sha1 function which hashes the password
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$sql = "SELECT userNo, userName, userLevel
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FROM users
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WHERE userName = ? AND userPass = ?";
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$stmt = $conn->prepare($sql);
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$stmt->bind_param('ss', $_POST['userName'], sha1($_POST['userPass']));
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$stmt->execute();
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if(!$result = $stmt->get_result())
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{
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//something went wrong, display the error
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echo 'Something went wrong while signing in. Please try again later.';
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//echo $conn->error; //debugging purposes, uncomment when needed
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}
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else
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{
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//the query was successfully executed, there are 2 possibilities
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//1. the query returned data, the user can be signed in
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//2. the query returned an empty result set, the credentials were wrong
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if($result->num_rows == 0)
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{
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echo 'You have supplied a wrong user/password combination. Please try again.';
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}
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else
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{
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//set the $_SESSION['signed_in'] variable to TRUE
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$_SESSION['signedIn'] = true;
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//we also put the user_id and user_name values in the $_SESSION, so we can use it at various pages
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while($row = $result->fetch_assoc())
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{
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$_SESSION['userNo'] = $row['userNo'];
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$_SESSION['userName'] = $row['userName'];
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$_SESSION['userLevel'] = $row['userLevel'];
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}
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echo 'Welcome, ' . htmlentities($_SESSION['userName'], ENT_QUOTES | ENT_HTML5, 'UTF-8') . '. <br /><a href="index.php">Proceed to the forum overview</a>.';
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}
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}
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}
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}
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}
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include 'footer.php';
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?>
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