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review.php
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review.php
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<?php
/**
* Helper function to enable UTF-8 searching
* @param mysqli $conn The MySQL connection
*/
function setUTF8($conn) {
if($stmt = $conn->prepare("SET NAMES utf8")) {
$stmt->execute();
unset($stmt);
}
}
/**
* Get all review written FOR a certain user
* @param mysqli $conn The MySQL connection
* @param int $course The course id
* @param int $id The user id
* @param int $reviewid The review id
* @return array(MySQLObject) An array of MySQLObjects representing all the reviews for the user
*/
function getReviewsFor($conn, $course, $id, $reviewid) {
$ret = array();
setUTF8($conn);
if($stmt = $conn->prepare("SELECT * FROM reviews WHERE id = ? AND course = ? AND review_id = ? ORDER BY review DESC")) {
$stmt->bind_param("iii", $id, $course, $reviewid);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$ret[] = $row;
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return $ret;
}
/**
* Get all reviews written by a certain user
* @param mysqli $conn The MySQL connection
* @param int $course The course id
* @param int $id The user id
* @param int $reviewid The review id
* @return array(MySQLObject) An array of review objects
*/
function getReviewsBy($conn, $course, $id, $reviewid) {
$ret = array();
setUTF8($conn);
if($stmt = $conn->prepare("SELECT * FROM reviews WHERE code_reviewer = ? AND course = ? AND review_id = ?")) {
$stmt->bind_param("iii", $id, $course, $reviewid);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$ret[] = $row;
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return $ret;
}
/**
* Get the whole MySQL review object for a pair of users and targets
* @param mysqli $conn The MySQL connection
* @param int $id The target's id
* @param int $autor The author's id
* @param int $course The course id
* @param int $reviewid The review id
* @return MySQLObject The MySQL object with all the data
*/
function getReview($conn, $id, $autor, $course, $reviewid) {
setUTF8($conn);
if($stmt = $conn->prepare("SELECT * FROM reviews WHERE id = ? and code_reviewer = ? AND course = ? AND review_id = ?")) {
$stmt->bind_param("iiii", $id, $autor, $course, $reviewid);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row;
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return array();
}
/**
* Get all users whose name contains a certain search name
* @param mysqli $conn The MySQL connection
* @param string $name The name to search for
* @param int $course The course id
* @return array(array) An array of arrays in the format (id => XX, name => XX)
*/
function getUsersLike($conn, $name, $course) {
$ret = array();
$param = strtolower("%".$name."%");
setUTF8($conn);
if($stmt = $conn->prepare("SELECT id,name FROM users WHERE LOWER(users.name) LIKE ? AND EXISTS (select 1 from courses where id = users.id and course = ?)")) {
$stmt->bind_param("si", $param, $course);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$ret[] = $row;
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return $ret;
}
/**
* Get all users in the whole database
* @param mysqli $conn The MySQL connection
* @return array(int) An array of user IDs
*/
function getUsers($conn) {
$ret = array();
if($stmt = $conn->prepare("SELECT id FROM users")) {
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$ret[] = $row['id'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return $ret;
}
/**
* Get a new review ID
* @param mysqli $conn The MySQL connection
* @return int A new review id
*/
function getNewReviewId($conn) {
if($stmt = $conn->prepare("SELECT MAX(id) + 1 AS `new_id` FROM review_schemes")) {
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
if(isset($row['new_id'])) {
return $row['new_id'];
} else {
return 0;
}
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return random_int(0, 100);
}
/**
* Get ALL user of a course
* @param mysqli $conn The MySQL connection
* @param int $course The course id
* @return array(int) An array of user IDs
*/
function getUsersOfCourse($conn, $course) {
$ret = array();
if($stmt = $conn->prepare("SELECT id FROM users WHERE EXISTS (select 1 from courses where id = users.id and course = ?)")) {
$stmt->bind_param("i", $course);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$ret[] = $row['id'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return $ret;
}
/**
* Selects all users of a course which are not teachers
* @param mysqli $conn The MySQL connection
* @param int $course The course id
* @return array(int) An array of user IDs
*/
function getUsersOfCourseApartFromAdmin($conn, $course) {
$ret = array();
if($stmt = $conn->prepare("SELECT id FROM users WHERE EXISTS (select 1 from courses where id = users.id and course = ?) AND level != 1")) {
$stmt->bind_param("i", $course);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$ret[] = $row['id'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return $ret;
}
/**
* Select all users of a course in a random order
* @param mysqli $conn The MySQL connection
* @param int $course The course id
* @return array(int) An array of user ids
*/
function getUsersForReviews($conn, $course) {
$ret = array();
if($stmt = $conn->prepare("SELECT id FROM users WHERE level != 1 AND EXISTS (select 1 from courses where id = users.id and course = ?) ORDER BY RAND()")) {
$stmt->bind_param("i", $course);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$ret[] = $row['id'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return $ret;
}
/**
* Set N review targets for each user of the course, where N is the limit
* @param mysqli $conn The MySQL connection
* @param int $course The course id
* @param int $limit The limit, how much targets every user should see
* @param int $reviewId The review id
*/
function setTargets($conn, $course, $limit, $reviewId) {
$us = getUsersForReviews($conn, $course);
shuffle($us);
$l = count($us);
if($l < 4) {
return false;
}
for ($i=0; $i < count($us); $i++) {
for ($j=$i + 1; $j < $i + $limit + 1; $j++) {
$x = $j;
if ($x > $l - 1) {
$x = $x - $l;
}
setReviewTarget($conn, $us[$i], $us[$x], $course, $reviewId);
}
}
return true;
}
/**
* Get all review targets for a certain user
* @param mysqli $conn The MySQL connection
* @param int $id The user id
* @param int $course The course id
* @param int $reviewid The review id
* @return array(array) An array containing an array in the format (name => XX, id => XX)
*/
function getReviewTargets($conn, $id, $course, $reviewid) {
$ret = array();
if($stmt = $conn->prepare("SELECT * FROM reviews WHERE code_reviewer = ? AND course = ? AND review_id = ?")) {
$stmt->bind_param("iii", $id, $course, $reviewid);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$ret[] = array('name' => getName($conn, $row['id']), 'id' => $row['id']);
}
}
$stmt->free_result();
} else {
die($conn->error);
}
return $ret;
}
/**
* Set a user as one review target for another user
* @param mysqli $conn The MySQL connection
* @param int $id The user id
* @param int $tar The target's user id
* @param int $course The course id
* @param int $reviewid The review id
*/
function setReviewTarget($conn, $id, $tar, $course, $reviewid) {
if($stmt = $conn->prepare("INSERT INTO reviews (id, code_reviewer, course, review_id) VALUES (?,?,?,?)")) {
$stmt->bind_param("iiii", $id, $tar, $course, $reviewid);
$stmt->execute();
unset($stmt);
} else {
echo $conn->error;
return false;
}
return true;
}
/**
* Check if a string starts with a certain substring
* @param string $haystack The string which should have a certain beginning
* @param string $needle The beginning of the string to check for
* @return boolean True if the haystack starts with the needle, False otherwise
*/
function startsWith($haystack, $needle) {
return (substr($haystack, 0, strlen($needle)) === $needle);
}
/**
* Check if a string ends with a certain substring
* @param string $haystack The string which should have a certain end
* @param string $needle The end of the string to check for
* @return boolean True if the haystack ends with the needle, False otherwise
*/
function endsWith($haystack, $needle) {
$length = strlen($needle);
if ($length == 0) {
return true;
}
return (substr($haystack, -$length) === $needle);
}
/**
* Sanitize and insert the link for a user
* @param mysqli $conn The MySQL connection
* @param int $id The user id
* @param string $code The link to the user's code
* @param int $course The course id
* @param int $reviewId The review id
*/
function setCode($conn, $id, $code, $course, $reviewId) {
if(!startsWith(strtolower($code), "http://")) {
$code = "http://" . $code;
}
if($stmt = $conn->prepare("INSERT INTO links (user, course, review_id, link) VALUES(?, ?, ?, ?) ON DUPLICATE KEY UPDATE link=?")){
$stmt->bind_param("iiiss", $id, $course, $reviewId, $code, $code);
$stmt->execute();
unset($stmt);
}
}
/**
* Change the submission type for a user in a review of a course.
* Format:
* 0 => Submission is a link
* 1 => Submission is a script
* @param mysqli $conn The MySQL connection
* @param int $id The user id
* @param int $type The type (@see Format)
* @param int $course The course id
* @param int $reviewId The review id
*/
function setSubmissionType($conn, $id, $type, $course, $reviewId) {
if($stmt = $conn->prepare("UPDATE reviews SET submission_type = ? WHERE id = ? AND course = ? AND review_id = ?")){
$stmt->bind_param("iiii", $type, $id, $course, $reviewId);
$stmt->execute();
unset($stmt);
}
}
/**
* Update the submission of a user to a certain script id
* @param mysqli $conn The MySQL connection
* @param int $id The user id
* @param int $scriptId The script id
* @param int $course The course id
* @param int $reviewId The review id
*/
function setScript($conn, $id, $scriptId, $course, $reviewId) {
if($stmt = $conn->prepare("UPDATE reviews SET submission_id = ? WHERE id = ? AND course = ? AND review_id = ?")){
$stmt->bind_param("iiii", $scriptId, $id, $course, $reviewId);
$stmt->execute();
unset($stmt);
}
}
function getNewestVersionForScriptAndUser($conn, $user, $scriptId) {
if($stmt = $conn->prepare("SELECT * FROM scripts LEFT JOIN (SELECT version, id FROM script_versions WHERE script_versions.id = ? ORDER BY version DESC LIMIT 1) AS versions ON (scripts.script_id = versions.id) WHERE scripts.user = ?")) {
$stmt->bind_param("ii", $scriptId, $user);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row["version"];
}
}
$stmt->free_result();
} else {
die($conn->error);
}
return 0;
}
function userOwnsScript($conn, $user, $scriptId) {
if($stmt = $conn->prepare("SELECT * FROM scripts WHERE user = ? AND script_id = ?")) {
$stmt->bind_param("ii", $user, $scriptId);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return True;
}
}
$stmt->free_result();
} else {
die($conn->error);
}
return False;
}
/**
* Update the code of a certain script
* Attention: Only call this when you know that the user owns this script!
* @param mysqli $conn The MySQL connection
* @param int $scriptId The script id
* @param int $script The code of the script
*/
function updateScript($conn, $id, $scriptId, $script) {
// increment version
$version = getNewestVersionForScriptAndUser($conn, $id, $scriptId) + 1;
if($stmt = $conn->prepare("INSERT INTO script_versions (id, version, last_modified, script) VALUES (?, ?, NOW(), ?) ")){
$stmt->bind_param("iis", $scriptId, $version, $script);
$stmt->execute();
echo $conn->error;
unset($stmt);
}
}
/**
* Create a script for a user with a name
* @param mysqli $conn The MySQL connection
* @param int $id The user id
* @param string $name The name of the script
* @return int The new Script ID
*/
function createScript($conn, $id, $name) {
if($stmt = $conn->prepare('INSERT INTO scripts (user, name) VALUES (?, ?)')){
$stmt->bind_param("is", $id, $name);
$stmt->execute();
$stmt = $conn->prepare("SELECT LAST_INSERT_ID() AS `id`");
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['id'];
}
}
unset($stmt);
} else {
die($conn->error);
}
return -1;
}
/**
* Get the script MySQL object selected by a certain user in a certain review for a certain course
* @param mysqli $conn The MySQL connection
* @param int $id The user id
* @param int $course The course id
* @param int $reviewid The review id
* @return array(object) The MySQL object
*/
function getScript($conn, $id, $course, $reviewid) {
if($stmt = $conn->prepare("SELECT * FROM reviews LEFT JOIN scripts ON scripts.script_id = reviews.submission_id WHERE submission_type = 1 AND id = ? AND course = ? AND review_id = ? ")) {
$stmt->bind_param("iii", $id, $course, $reviewid);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row;
}
}
$stmt->free_result();
} else {
die($conn->error);
}
return null;
}
/**
* Get the link to a code by a user, a course and a review id
* @param mysqli $conn The MySQL connection
* @param int $id The user id
* @param int $course The course id
* @param int $reviewid The review id
* @return string The link
*/
function getCode($conn, $id, $course, $reviewid) {
if($stmt = $conn->prepare("SELECT link FROM links WHERE user = ? AND course = ? AND review_id = ?")) {
$stmt->bind_param("iii", $id, $course, $reviewid);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['link'];
}
}
$stmt->free_result();
} else {
die($conn->error);
}
return "";
}
/**
* Get the IDs of all the reviews a certain user has participated in
* @param mysqli $conn The MySQL connection
* @param int $id The user id
* @param int $course The course id
* @return array(int) An array of review IDs
*/
function getAllReviewIDsOfUser($conn, $id, $course) {
$ret = array();
if($stmt = $conn->prepare("SELECT review_id FROM reviews WHERE id = ? AND course = ? GROUP BY review_id")) {
$stmt->bind_param("ii", $id, $course);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$ret[] = $row['review_id'];
}
}
$stmt->free_result();
} else {
die($conn->error);
}
return $ret;
}
/**
* Get an array of all review ids of a certain course
* @param mysqli $conn The MySQL connection
* @param int $course The course id
* @return array(int) An array containing all the review ids of this course
*/
function getAllReviewIDsOfCourse($conn, $course) {
$ret = array();
if($stmt = $conn->prepare("SELECT id FROM review_schemes WHERE course = ?")) {
$stmt->bind_param("i", $course);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$ret[] = $row['id'];
}
}
$stmt->free_result();
} else {
die($conn->error);
}
return $ret;
}
/**
* Get the name of a user by its ID
* @param mysqli $conn The MySQL connection
* @param int $id The ID of the user
* @return string The name of the user
*/
function getName($conn, $id) {
setUTF8($conn);
if($stmt = $conn->prepare("SELECT * FROM users WHERE id = ?")) {
$stmt->bind_param("i", $id);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['name'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return "";
}
/**
* Get the percentage of overall finished reviews in one cours
* @param mysql $conn The MySQL connection
* @param int $course The ID of the course
* @return float The percentage
*/
function getFinishedReviewsOfCourse($conn, $course) {
if($stmt = $conn->prepare('SELECT avg( review IS NOT NULL ) * 100 AS "avg" FROM reviews WHERE course = ?')) {
$stmt->bind_param("i", $course);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['avg'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return 0;
}
/**
* Get the percentage of finished reviews of one id in one specific course
* @param mysqli $conn The MySQL connection
* @param int $course The ID of the course
* @param int $reviewId The ID of the review
* @return float The percentage of finished reviews / total reviews
*/
function getFinishedReviewsOfCourseAndId($conn, $course, $reviewId) {
if($stmt = $conn->prepare('SELECT avg( review IS NOT NULL ) * 100 AS "avg" FROM reviews WHERE course = ? AND review_id = ?')) {
$stmt->bind_param("ii", $course, $reviewId);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['avg'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return 0;
}
/**
* Check if an user with the given ID exists
* @param mysqli $conn The MySQL connection
* @param int $id The ID of the user to check for
* @return boolean True if the user exists, false otherwise
*/
function userExists($conn, $id) {
if($stmt = $conn->prepare("SELECT id FROM users WHERE id = ?")) {
$stmt->bind_param("i", $id);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
return true;
}
$stmt->free_result();
} else {
echo $conn->error;
}
return false;
}
/**
* Get the ID of a course by its key
* @param mysqli $conn The MySQL connection
* @param string $key The key
* @return int The ID of the course
*/
function getCourseByKey($conn, $key) {
if($stmt = $conn->prepare("SELECT course FROM course_data WHERE signin_key = ?")) {
$stmt->bind_param("s", $key);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['course'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return 0;
}
/**
* Get the Key of a course by its id
* @param mysqli $conn The MySQL connection
* @param int $id The ID
* @return string The key of the course
*/
function getKeyOfCourse($conn, $id) {
if($stmt = $conn->prepare("SELECT signin_key FROM course_data WHERE course = ?")) {
$stmt->bind_param("i", $id);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['signin_key'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return 0;
}
/**
* Get the name of a course by its course_id
* @param mysqli $conn The mysql connection
* @param int $course The id of the course
* @return string The name of the course
*/
function getCourseName($conn, $course) {
if($stmt = $conn->prepare("SELECT name FROM course_data WHERE course = ?")) {
$stmt->bind_param("i", $course);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['name'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return "";
}
/**
* Checks whether a certain user is part of a certain course
* @param mysqli $conn The MySQL connection
* @param int $id The user's id
* @param int $course The course id
* @return boolean Returns true if he is in the course, false otherwise
*/
function isUserInCourse($conn, $id, $course) {
if($stmt = $conn->prepare("SELECT 1 from courses WHERE id = ? AND course = ?")) {
$stmt->bind_param("ii", $id, $course);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
return true;
}
$stmt->free_result();
} else {
echo $conn->error;
}
return false;
}
/**
* Get the JSON formatted object of the review scheme for a given course and a review id
* @param mysqli $conn The MySQL connection
* @param int $course The course id
* @param int $reviewId The review id
* @return string The name of the review
*/
function getReviewSchemeForID($conn, $course, $reviewId) {
setUTF8($conn);
if($stmt = $conn->prepare("SELECT * FROM review_schemes WHERE course = ? AND id = ?")) {
$stmt->bind_param("ii", $course, $reviewId);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['review_scheme'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return "";
}
/**
* Get the name of a review by its id
* @param mysqli $conn The MySQL connection
* @param int $reviewId The review id
* @return string The name
*/
function getReviewNameForID($conn, $reviewId) {
setUTF8($conn);
if($stmt = $conn->prepare("SELECT * FROM review_schemes WHERE id = ?")) {
$stmt->bind_param("i", $reviewId);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['name'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return "";
}
/**
* Adds a new review scheme to the given course. This will call
* @see @getNewReviewId
* @param mysqli $conn The MySQL connection
* @param int $course The id of the course
* @param string $review The JSON formatted object of the review scheme
*/
function addReviewScheme($conn, $course, $review) {
setUTF8($conn);
if($stmt = $conn->prepare("INSERT INTO review_schemes (course, review_scheme, name, id) VALUES (?,?,?,?)")) {
$encoded = json_encode($review);
$name = $review->name;
$id = getNewReviewId($conn);
$stmt->bind_param("issi", $course, $encoded, $name, $id);
$stmt->execute();
unset($stmt);
}
}
/**
* Creates a course with the given name and the given signin key
* @param mysqli $conn The MySQL connection
* @param string $courseName The name
* @param string $key The key
*/
function createCourse($conn, $courseName, $key) {
setUTF8($conn);
if($stmt = $conn->prepare("INSERT INTO course_data (signin_key, name) VALUES(?,?)")) {
$stmt->bind_param("ss", $courseName, $key);
$stmt->execute();
unset($stmt);
}
}
/**
* Handles a modification of a review
* @param mysqli $conn The MySQL connection
* @param int $id The id of the person who will get the review
* @param int $autor The id of the author of the review
* @param int $course The id of the course
* @param string $review The review itself as a JSON formatted object
* @param int $reviewid The review ID
*/
function setReview($conn, $id, $autor, $course, $review, $reviewid) {
setUTF8($conn);
if($stmt = $conn->prepare("UPDATE reviews SET review = ?, modified = NOW() WHERE id = ? AND course = ? AND code_reviewer = ? AND review_id = ?")) {
$stmt->bind_param("siiii", $review, $id, $course, $autor, $reviewid);
$stmt->execute();
unset($stmt);
}
}
/**
* Changes the name of the course to a certain name
* @param mysqli $conn The MySQL connection
* @param int $course The course id
* @param string $name The name
*/
function setCourseName($conn, $course, $name) {
setUTF8($conn);
if($stmt = $conn->prepare("UPDATE course_data SET name = ? WHERE course = ?")) {
$stmt->bind_param("si", $name, $course);
$stmt->execute();
unset($stmt);
}
}
/**
* Adds an user with the given user id to the given course
* @param mysqli $conn The MySQL connection
* @param int $id The user id
* @param int $course The course id
*/
function addUserToCourse($conn, $id, $course) {
if($stmt = $conn->prepare("INSERT INTO courses (id, course) VALUES (?,?)")) {
$stmt->bind_param("ii", $id, $course);
$stmt->execute();
unset($stmt);
} else {
echo $conn->error;
return false;
}
return true;
}
/**
* Handle the action when a user passes in a key in "signup.php"
* @param mysqli $conn The MySQL connection
* @param int $id The id of the user
* @param string $key The signup string of the user
* @return int An int representing the result of the action
*/
function handleKeyTyped($conn, $id, $key) {
$course = getCourseByKey($conn, $key);
if($course == "") {
return -3;
} elseif (isUserInCourse($conn, $id, $course)) {
return -2;
} else {
if (addUserToCourse($conn, $id, $course) != true){
return -1;
} else {
return 0;
}
}
}
/**
* Get all reviews of one course which got modified during the last 24 hours
* @param mysqli $conn The MySQL connection
* @param int $course The course id
* @return int The number of modified reviews
*/
function getReviewsOfToday($conn, $course) {
if($stmt = $conn->prepare("SELECT DATE(`reviews`.`modified`) AS `date`, COUNT(*) AS `count` FROM `reviews` WHERE course = ? AND `reviews`.`modified` BETWEEN DATE_SUB(NOW(), INTERVAL 1 MONTH) AND NOW() GROUP BY `date` ORDER BY `date`")) {
$stmt->bind_param("i", $course);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['count'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return 0;
}
/**
* Get the total amount of logins since a given interval
* @param mysqli $conn The MySQL connection
* @param mysqlinterval $interval The interval to check
* @return int The number of logins
*/
function getTotalLoginsOfTimeInterval($conn, $interval) {
if($stmt = $conn->prepare("SELECT COUNT(*) as 'count' from login_history WHERE for_date BETWEEN DATE_SUB(NOW(), INTERVAL ".$interval.") AND NOW()")) {
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['count'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return 0;
}
/**
* Generate a random password of given length
* @param int $length The required length of the password
* @return string A new random passwort containg letters [a-z], [A-Z] and [0-9]
*/
function randomPassword($length){
$alphabet = 'abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNOPQRSTUVWXYZ1234567890';
$pass = array();
$alphaLength = strlen($alphabet) - 1;
for ($i = 0; $i < $length; $i++) {
$n = rand(0, $alphaLength);
$pass[] = $alphabet[$n];
}
return implode($pass);
}
/**
* Get the number of updated reviews for a user since his last login
* @param mysqli $conn The MySQL connection
* @param int $id The id of the user
* @param int $course The ID of the course to check for
* @return int The amount of upated reviews
*/
function getReviewsSinceLastLoginForUser($conn, $id, $course) {
if($stmt = $conn->prepare("SELECT COUNT(*) as `numbers` FROM `info`.`reviews` WHERE `modified` > (SELECT `for_date` FROM `login_history` WHERE `user` = ? AND course = ? ORDER BY `for_date` DESC LIMIT 1,1) AND id = ?")) {
$stmt->bind_param("iii", $id, $course, $id);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($row = $result->fetch_assoc()) {
return $row['numbers'];
}
}
$stmt->free_result();
} else {
echo $conn->error;
}
return 0;
}
/**
* Get the total amount of courses in one course
* @param mysqli $conn The MySQL connection
* @param int $course The ID of the course
* @return int The amount
*/