<?php # Script 9.5 - secure register.php
// This script performs an INSERT query to add a record to the users table.
// 
include (CHAPTER_PATH.'/'.$chapter.'/includes/9.1.php');

// check if form has been submitted
if($_SERVER['REQUEST_METHOD'] == 'POST') {

	// connect to db
	require(CONNECT);

	// create error array 
	$errors = array();

	// check each field for validity, assign error message if fails
	// first_name
	if (empty($_POST['first_name'])) {
		$errors['fn'] = 'You forgot to enter your first name.';
	} else {
		$fn = mysqli_real_escape_string($link,trim($_POST['first_name']));
	}

	// last_name
	if (empty($_POST['last_name'])) {
		$errors['ln'] = 'You forgot to enter your last name.';
	} else {
		$ln = mysqli_real_escape_string($link,trim($_POST['last_name']));
	}

	// email 
	if (empty($_POST['email'])) {
		$errors['e'] = 'You forgot to enter your email address.';
	} elseif (!(filter_var(trim($_POST['email']), FILTER_VALIDATE_EMAIL))) {
		$errors['e'] = 'Your email is not in a valid format.';
	} else {
		$e = mysqli_real_escape_string($link,trim($_POST['email']));
		//prevent users with duplicate email addresses
		$q = "SELECT user_id FROM site_users WHERE email='$e'";
		if ($r = @mysqli_query($link, $q)) {
			if(mysqli_num_rows($r) != 0) {
				$errors['e'] = 'Sorry, that email has already been used. Please enter a different email address.';
			}
			// free result set 
			mysqli_free_result($r);
		}	
	}		
	
	// pass1==pass2
	if (!empty($_POST['pass1'])) {
		if ($_POST['pass1'] != $_POST['pass2']) {
			$errors['p2'] = 'Your passwords do not match.';
		} else {
			$p = mysqli_real_escape_string($link,trim($_POST['pass1']));
		}
	} else {
		$errors['p1'] = 'You forgot to enter your password.';
	}

	if(empty($errors)) { // if no errors

		// build query
		$q= "INSERT INTO site_users (first_name,last_name,email,pass,registration_date) VALUES ('$fn','$ln','$e',SHA1('$p'),NOW())";
		// $q = "ERROR";

		// submit data
		if($r = mysqli_query($link,$q)) {

			if(mysqli_affected_rows($link) == 1) {
				// data successfully inserted
				$message = "<h2>Thank you!</h2><p>Your name has been added to our list of users!</p>";
			} else {
				// error - data not inserted
				$message = "<h2>System Error</h2><p class='error'>Your information could not be added to our database.<br />We apologize for any inconvenience, please <a href='javascript:history.back()'>try again</a>.</p>";
				$message .= '<p><span class="content-caption">Debugging information</span>Error message: <br />'.mysqli_error($link).'<br /><br />Query: <br />'. $q .'</p>';
			}
			
			// free result set -- not needed because insert statement returns boolean value
			//mysqli_free_result($r);

		} else {
			//query unsuccessful
			$message = '<h2>Error</h2><p class="error-message error">There was an error accessing the database. Please try again later.</p>';	
		}
		
		//disconnect from db
		require(DISCONNECT);
		
		// provide feedback from submission
		echo '<div id="content" class="message">'.$message.'</div>';

		// include footer
		include (CHAPTER_PATH.'/'.$chapter.'/includes/9.2.php');
		
		// exit script - do not redisplay form
		exit(); 

	} else {
		$errors['flag'] = "<div class='error-message error'><h2>Error</h2><p>Your registration is not complete.<br />Please doublecheck your information and resubmit after correcting the highlighted errors.</p></div>";
	}
	
	//disconnect from db
	require(DISCONNECT);
}
// begin form output. if submitted with errors - include original submission values with error messages
echo "<div id='content'>";
?>
<h1>Register</h1>
<?php echo (isset($errors['flag']))? $errors['flag'] : ''; ?>
<form action="" method="post">
	<p>
		<label for='fn'>First Name: </label>
		<input type="text" id='fn' name="first_name" size="15" maxlength="20" value="<?php if (isset($_POST['first_name'])) echo $_POST['first_name']; ?>" />
		<?php echo (isset($errors['fn']))?'<span class="error">'.$errors['fn'].'</span>' : ''; ?>
	</p>
	<p>
		<label for='ln'>Last Name: </label>
		<input type="text" id='ln' name="last_name" size="15" maxlength="40" value="<?php if (isset($_POST['last_name'])) echo $_POST['last_name']; ?>" />
		<?php echo (isset($errors['ln']))?'<span class="error">'.$errors['ln'].'</span>' : ''; ?></p>
	<p>
		<label for='e'>Email Address: </label>
		<input type="text" id='e' name="email" size="20" maxlength="60" value="<?php if (isset($_POST['email'])) echo $_POST['email']; ?>"  />
		<?php echo (isset($errors['e']))?'<span class="error">'.$errors['e'].'</span>' : ''; ?>
	</p>
	<p>
		<label for='p1'>Password: </label>
		<input type="password" id='p1' name="pass1" size="10" maxlength="20" value="<?php if (isset($_POST['pass1'])) echo $_POST['pass1']; ?>"  />
		<?php echo (isset($errors['p1']))?'<span class="error">'.$errors['p1'].'</span>' : ''; ?>
	</p>
	<p>
		<label for='p2'>Confirm Password: </label>
		<input type="password" id='p2' name="pass2" size="10" maxlength="20" value="<?php if (isset($_POST['pass2'])) echo $_POST['pass2']; ?>"  />
		<?php echo (isset($errors['p2']))?'<span class="error">'.$errors['p2'].'</span>' : ''; ?>
	</p>
	<p>
		<input type="submit" name="submit" value="Register" />
	</p>
</form>
<?php
echo "</div>";
include (CHAPTER_PATH.'/'.$chapter.'/includes/9.2.php');
?>