/lenasys/0.1

<?php

session_start();

function htmlsafe($str){

	return $str=htmlspecialchars($str,ENT_QUOTES,'UTF-8');

}

function logLogin($loginName, $success, $duggaNr, $courseName, $courseOccasion, $pdo){

	$insertString = "INSERT INTO userLoginsLog(loginName, userAgent, userIP, DateTime, success, quizNr, courseName, courseOccasion) VALUES(:LOGIN,:UAGENT,:IP,:DATETIME,:SUCCESS,:QNR,:CNAME,:COCCASION);";

	$insertStmt = $pdo->prepare($insertString);

	$insertStmt->bindParam(':LOGIN', $loginName);

	$insertStmt->bindParam(':UAGENT', $_SERVER['HTTP_USER_AGENT']);

	$now=new DateTime();

	$dateString=$now->format('Y-m-d H:i:s');

	$insertStmt->bindParam(':DATETIME', $dateString); // date and time formated to string e.g. "2012-08-23 08:59:00"

	$insertStmt->bindParam(':IP', $_SERVER['REMOTE_ADDR']);

	$insertStmt->bindParam(':SUCCESS', $success);

	$insertStmt->bindParam(':QNR', $duggaNr);

	$insertStmt->bindParam(':CNAME', $courseName);

	$insertStmt->bindParam(':COCCASION', $courseOccasion);

	$insertStmt->execute();	

}

$errorMsg = "";

//Returns the user login name if login is successfull else false

function checkLogin(&$errorMsg, $courseName, $courseOccasion, $duggaNr) {

    $loginName = "";

    $password = "";

	include "dbconnect.php";

    if ((isset($_POST['loginName']) && isset($_POST['password']))) {

        $loginName = trim($_POST['loginName']);

        $password = $_POST['password'];

    } else if (isset($_SESSION['loginName']) && isset($_SESSION['password'])) {

        $loginName = $_SESSION['loginName'];

        $password = $_SESSION['password'];

    }

    if ($loginName != "" && $password != "") {

		//Check if the student is a praticipant of the course

		$queryString="SELECT Student.loginName, Student.passw

					   FROM Student, StudentCourseRegistration 

					   WHERE Student.ssn=StudentCourseRegistration.studentSsn

					   AND Student.loginName=:LOGINN

					   AND Student.passw=:PASSW

					   AND courseName=:CNAME 

					   AND courseOccasion=:COCCASION;";

		$stmt = $pdo->prepare($queryString);

		$stmt->bindParam(':LOGINN', $loginName);

		$stmt->bindParam(':PASSW', $password);

		$stmt->bindParam(':CNAME', $courseName);

		$stmt->bindParam(':COCCASION', $courseOccasion);

		$stmt->execute();

		$result=$stmt->fetch();

		if ($stmt->rowCount() == 1) { //Student is a participant of this course and course occasion

			// foreach ($stmt->fetch() as $row) { $courseName, $courseOccasion, $duggaNr

                $_SESSION['loginName'] = $result['loginName'];

                $_SESSION['password'] = $result['passw'];

                $_SESSION['courseName'] = $courseName;

                $_SESSION['courseOccasion'] = $courseOccasion;

                $_SESSION['quizNr'] = $duggaNr;

            // }

            logLogin($loginName, "successful", $duggaNr, $courseName, $courseOccasion, $pdo);

			return $_SESSION['loginName'];

        } else {

			$errorMsg="Incorrect username or password";

			// CREATE TABLE logFailedUserLogins(

			// id INTEGER AUTO_INCREMENT,

			// loginName VARCHAR(30),

			// userAgent VARCHAR(1024), /*$_SERVER['HTTP_USER_AGENT']*/

			// userIP VARCHAR(20), /*$_SERVER['REMOTE_ADDR']*/

			// DateTime TIMESTAMP,

			// courseName VARCHAR(100),

			// courseOccasion VARCHAR(25),

			// quizNr INTEGER,

			// PRIMARY KEY(id)

			// ) ENGINE=INNODB CHARACTER SET utf8 COLLATE utf8_swedish_ci;

			/*$insertString = "INSERT INTO logFailedUserLogins(loginName, userAgent, userIP, courseName, courseOccasion, quizNr) VALUES(:LOGIN,:UAGENT,:UIP,:CNAME,:COCCASION,:QNR);";

			$insertStmt = $pdo->prepare($insertString);

			$insertStmt->bindParam(':LOGIN',  $loginName);

			$insertStmt->bindParam(':UAGENT', $_SERVER['HTTP_USER_AGENT']);

			$insertStmt->bindParam(':UIP', $_SERVER['REMOTE_ADDR']);

			$insertStmt->bindParam(':QNR', $duggaNr);

			$insertStmt->bindParam(':CNAME', $courseName);

			$insertStmt->bindParam(':COCCASION', $courseOccasion);

			$insertStmt->execute();*/

			logLogin($loginName, "failed - Incorrect username and/or password", $duggaNr, $courseName, $courseOccasion, $pdo);

			return false;

		}	

    }

	logLogin($loginName, "failed - No username and/or password given", $duggaNr, $courseName, $courseOccasion, $pdo);

    return false;

}

if (isset($_GET['logout'])) {

	session_destroy();

}

?>