154 lines
4.0 KiB
PHP
154 lines
4.0 KiB
PHP
<?php
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/**
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* @Author: printempw
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* @Date: 2016-01-16 23:01:33
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* @Last Modified by: prpr
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* @Last Modified time: 2016-01-22 15:46:20
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*/
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$dir = dirname(dirname(__FILE__));
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require "$dir/config.php";
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class utils {
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private static $connection = null;
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/**
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* Connect to database
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*
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* @return void
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*/
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public static function connect() {
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if (!self::$connection) {
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if ($con = mysql_connect(DB_HOST, DB_USER, DB_PASSWD)) {
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self::$connection = $con;
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mysql_select_db(DB_NAME, self::$connection);
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} else {
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$msg = "Can not connect to mysql, check if database info correct in config.php. ".mysql_error();
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self::raise(-1, $msg);
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}
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}
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}
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/**
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* Use static function to replace raising a exception
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*
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* @param int $errno
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* @param string $msg, message to show
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* @return void
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*/
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public static function raise($errno = -1, $msg = "Error occured.") {
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$exception['errno'] = $errno;
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$exception['msg'] = $msg;
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die(json_encode($exception));
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}
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/**
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* Return array of rows which matches provided key and value
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*
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* @param string $key
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* @param string $value
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* @return array $row, rows matched the key and value
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*/
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public static function select($key, $value) {
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$query = self::query("SELECT * FROM users WHERE $key='$value'");
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$row = mysql_fetch_array($query);
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return $row;
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}
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/**
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* Insert a record to database
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*
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* @param array $array, [uname, passwd, ip]
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* @return bool
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*/
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public static function insert($array) {
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$uname = $array['uname'];
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$passwd = $array['passwd'];
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$ip = $array['ip'];
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self::connect();
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$query = self::query("INSERT INTO users (username, password, ip, preference) VALUES ('$uname', '$passwd', '$ip', 'default')");
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return $query;
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}
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public static function update($uname, $key, $value) {
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$query = self::query("UPDATE users SET $key='$value' WHERE username='$uname'");
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return $query;
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}
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public static function delete($uname) {
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$query = self::query("DELETE from users WHERE username='$uname'");
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return $query;
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}
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/**
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* Rename uploaded file
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*
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* @param array $file, files uploaded via HTTP POST
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* @return string $hash, sha256 hash of file
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*/
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public static function upload($file) {
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move_uploaded_file($file["tmp_name"], "./textures/tmp.png");
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$hash = hash_file('sha256', "./textures/tmp.png");
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rename("./textures/tmp.png", "./textures/".$hash);
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return $hash;
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}
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/**
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* Remove a file
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*
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* @param $filename
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* @return $bool
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*/
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public static function remove($filename) {
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if(file_exists($filename)) {
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if (!unlink($filename)) {
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self::raise(-1, "Uncaught error when deleting $filename");
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} else {
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return true;
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}
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}
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}
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/**
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* Simple SQL injection protection
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*
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* @param string $string
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* @return string
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*/
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public static function convertString($string) {
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return stripslashes(trim($string));
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}
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/**
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* Query with raw SQL statement
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*
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* @param string $sql, raw SQL statement
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* @return bool
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*/
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private static function query($sql) {
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self::connect();
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$query = mysql_query($sql, self::$connection);
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if ($query) {
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return $query;
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} else {
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self::raise('1', mysql_error());
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}
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mysql_close(self::$connection);
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}
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/**
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* Get the value of key in an array if index exist
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*
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* @param string $key
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* @param array $array
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* @return object
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*/
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public static function getValue($key, $array) {
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if (array_key_exists($key, $array)) {
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return $array[$key];
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}
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return false;
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}
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}
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?>
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