basic function works

config.php

 <?php
 
-$dbhost = "localhost";
-$dbuser = "license";
-$dbpass = "Nbc3PhYCn3Fn0a7";
-$dbname = "license";
+define('DB_HOST', "localhost");
+define('DB_USER',  "license" );
+define('DB_PASS', "Nbc3PhYCn3Fn0a7") ;
+DEFINE('DB_NAME', "license");

index.php

 <?php 
 require "vendor/autoload.php";
 require "config.php";
-// Takes raw data from the request
-$json = file_get_contents('php://input');
-//
-// Converts it into a PHP object
-$data = json_decode($json);
-
-$db = new MeekroDB($dbhost, $dbuser, $dbpass,$dbname);
-
-$result = $db->query("SELECT * FROM servers");
-foreach ($result as $row) {
-    echo "id: " . $row['id'] . "\n";
-    echo "host: " . $row['host'] . "\n";
-    echo "type: " . $row['type'] . "\n";
-    echo "-------------\n";
+
+
+class LicenseRegistration {
+    private $db = null; 
+    private $m_request_body = "";
+    private $m_input = FALSE;
+    
+    function __construct() 
+    {
+        // Takes raw data from the request
+        $this->m_request_body = file_get_contents('php://input');
+        $this->m_input = json_decode(($this->m_request_body));
+        $this->db = new MeekroDB(DB_HOST, DB_USER, DB_PASS,DB_NAME); // from config file
+        //enable exception
+        $this->db->error_handler  = false;
+        $this->db->nonsql_error_handler = false; 
+        $this->db->throw_exception_on_error = true;
+        $this->db->throw_exception_on_nonsql_error = true;
+
+    }
+    
+   
+    private function is_valid_input() 
+    {
+        //if it's not a valid json
+        if ( $this->m_input != FALSE && 
+             property_exists($this->m_input, "license") && 
+             property_exists($this->m_input, "mid")
+        ){
+
+            if ( strlen($this->m_input->license) >= 10 &&
+                 strlen($this->m_input->mid) >=10 
+            ){
+                return true; 
+            }
+            
+        }
+        $this->record_possible_hack();
+        return false; 
+    }
+    
+    private function is_legit_code() 
+    {
+        $code = $this->m_input->license;
+        $f = $this->db->query("SELECT * FROM volume WHERE code='$code'");
+        return count($f) == 1 ; 
+    }
+    
+    //record possible hack input
+    //save ip, date, request header, and invalid inputs
+    private function record_possible_hack()
+    {
+        $dump = new DumpHTTPRequestToString();
+        $req = $dump->execute(); 
+        $err = $this->db->insert("hack", array(
+            "ip" => $this->get_client_ip(),
+            "input" => $this->m_request_body,
+            "request" => $req
+        ));   
+    }
+    
+    private function fresh_registration()
+    {
+        $config = $this->get_license_config(); 
+        //inser it into database
+        $license = [
+            'code' => $this->m_input->license,
+            'mid' => $this->m_input->mid,
+            'seat' => 1,
+            'quota' => $this->get_license_quota() ,
+            'config' => intVal($config["id"]),
+            'enabled' => 1,
+            'ip' => $this->get_client_ip()
+        ];
+ 
+        try {
+            $this->db->insert("register", $license);
+            $this->send_config($config, $license);
+        }catch (MeekroDBException $e){
+            $this->send_error("Failed to add registration, please try again later" );
+        }
+    }
+    
+    private function get_exact_match()
+    {
+        $code = $this->m_input->license;
+        $mid = $this->m_input->mid;
+        $match =  $this->db->query("SELECT * FROM register WHERE code='$code' AND mid='$mid';");
+        if (count($match) !=1 ){
+            return FALSE;
+        }else{
+            return $match[0]; 
+        }
+    }
+    
+    private function get_license_by_code()
+    {
+        $code = $this->m_input->license;
+        $matches =  $this->db->query("SELECT * FROM register WHERE code='$code';");
+        if (count($matches) < 1 ){
+            return FALSE;
+        }else{
+            return $matches;
+        }
+    }
+    
+    private function quota_available($matches)
+    {
+        return count($matches) < $this->get_license_quota(); 
+        
+    }
+    
+    private function allocate_seat($matches){
+        $seat = $this->find_empty_seat($matches); 
+        $config = $this->get_license_config(); 
+        
+        $license = array(
+            'code' => $this->m_input->license,
+            'mid' => $this->m_input->mid,
+            'seat' => $seat,
+            'quota' => $this->get_license_quota() ,
+            'config' => intVal($config["id"]),
+            'enabled' => 1,
+            'ip' => $this->get_client_ip()
+        );
+        try {
+            $this->db->insert("register",$license);
+            $this->send_config($config, $license);
+        }catch (MeekroDBException $e){
+            $this->send_error("Allocate Seats $seat failed");
+        }
+        
+          
+    }
+    
+    private function find_empty_seat($matches)
+    {
+        for ($i=1; $i <= $this->get_license_quota(); $i++) {
+            if ( $this->seats_occupied($matches, $i) ) 
+                continue; 
+            return $i; 
+        }
+    }
+    
+    private function seats_occupied($matches, $seat)
+    {
+        for ($i=0; $i< count($matches); $i++){
+            if ( $matches[$i]["seat"] == $seat )
+                return true; 
+        }
+        return false; 
+    }
+    
+    //main routine
+    public function start_registration() 
+    {
+        if (! $this->is_valid_input() ){
+            $this->send_error("Sorry, your input is invalid");
+            return; //stop everything 
+        }
+
+        if (! $this->is_legit_code()) { 
+            $this->send_error("Sorry, Your license is not valid");
+            return; 
+        }
+            
+        //check mid see if a matched license code and mid already exist
+        $license = $this->get_exact_match(); 
+        if ( $license != FALSE ){ //we found the match both license-code and machine-id  
+            //get existing config
+            if ( $license['enabled'] == 1 ) {
+                $existing_config = $this->get_config_by_id($license["config"]);
+                $this->send_config($existing_config, $license);
+            }else{
+                $this->send_error("Sorry, Your license is disabled"); 
+            }
+        }else{
+            $licenses = $this->get_license_by_code(); 
+            
+            if ( $licenses == FALSE ) {//not found
+                $this->fresh_registration(); 
+            }else{//we found, existing records
+                if ( $this->quota_available($licenses) ){ 
+                    $this->allocate_seat($licenses);
+                }else{
+                    $this->send_error("Sorry, Your license has been fully allocated");
+                }
+            }
+        }
+    }
+    
+    private function get_config_by_id($id)
+    {
+        $f= $this->db->query("SELECT * FROM servers WHERE id=$id");
+        return $f[0];
+    }
+    
+    private function send_config($config, $license) 
+    {
+        
+        $msg = "" ;
+        if ($license["quota"] >1){
+           $msg = "Seat " . $license["seat"] . "/" . $license["quota"] . " has been allocated to you";
+           
+        }else{
+            $msg = "Single user license registered sucessfully";
+        }
+        
+        $result= array(
+            "success" => true,
+            "type" => $config["type"], 
+            "host" => $config["host"],
+            "port" => $config["port"],
+            "username" => $config["user"],
+            "password" => $config["pass"], 
+            "license" => $license["code"],
+            "mid" => $license["mid"],
+            "proxyDNS" => true,
+            "enable" => true,
+            "errMsg" => $msg,
+            "link" => "https://hk-01.biukop.com/",
+            "linkText" => "Check My IP",
+        );
+        $myJSON = json_encode($result);
+        echo $myJSON; 
+    }
+    
+    private function send_error($msg){
+        echo $msg; 
+        die(); 
+    }
+    
+    private function decode_pass($encrypt)
+    {
+        $buf = base64_decode($encrypt);
+        if ( substr($buf, -3, 2) != "#!" )
+            return "invalid-encrypt";
+        
+        $magic_digit = intVal(substr($buf, 2 , 1)); 
+        $pass = substr($buf,5, -$magic_digit);
+        return $pass; 
+    }
+    
+    private function encode_pass($pass) {
+        // prefix: "xxyxx";  Y is digit
+        $magic_digit = $this->rand_digit();
+        $prefix = $this->build_prefix($magic_digit);
+        $suffix = $this->build_suffix($magic_digit);     
+        //surffix  yyyyy#!xx , max 9  
+        return base64_encode($prefix . $pass . $suffix);  
+    }
+        
+    private function rand_char() {
+        $pool="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789~!@#$%^&*()_+:{}|<>?[]\;,./";
+        $idx = rand(0, strlen($pool) -1 ); 
+        return substr($pool, $idx, 1);  
+    }
+    
+    private function rand_digit() {
+        return rand(3,9); 
+    }
+    
+    private function build_prefix($magic_digit) 
+    {
+        return $this->rand_char() . $this->rand_char() . 
+                   "$magic_digit" . 
+               $this->rand_char() . $this->rand_char();
+    }
+    
+    private function build_suffix($magic_digit)
+    {   //$magic_digit >=3
+        $suffix = "";
+        for ($i=1; $i<= $magic_digit-3; $i++) {
+            $suffix .= $this->rand_char();
+        }
+        $suffix .= "#!";
+        $suffix .= $this->rand_char(); 
+        return $suffix; 
+    }
+    
+    private function get_client_ip ()
+    {
+        //whether ip is from share internet
+        if (!empty($_SERVER['HTTP_CLIENT_IP']))
+        {
+            $ip_address = $_SERVER['HTTP_CLIENT_IP'];
+        }
+        //whether ip is from proxy
+        elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
+        {
+            $ip_address = $_SERVER['HTTP_X_FORWARDED_FOR'];
+        }
+        //whether ip is from remote address
+        else
+        {
+            $ip_address = $_SERVER['REMOTE_ADDR'];
+        }
+        return $ip_address;
+    }
+    
+    private function get_license_quota()
+    {
+        $code = $this->m_input->license;
+        $f = $this->db->query("SELECT * FROM volume WHERE code='$code'");
+        return intVal($f[0]["max"]);
+    }
+    
+    private function get_license_config()
+    {
+        $code = $this->m_input->license;
+        $f = $this->db->query("SELECT * FROM servers WHERE code='$code'");
+        return $f[0];
+    }
+    
+    public function test_password() {
+        $encrypt = $this->encode_pass("superforex");
+        $pass1 = $this->decode_pass($encrypt);
+        $pass = $this->decode_pass("Y2Q1ZDFzdXBlcmZvcmV4MTIjITU=");
+        if ($pass != $pass1){
+            echo "wrong"; 
+        }
+    }
+    
+    public function test_license_quota() {
+        $this->m_input = new stdClass();
+        $this->m_input->license = "VOL-XDTG-ADQE-DQERG-QERFDA"; 
+        $six = $this->get_license_quota();
+        if ($six != 6)
+            echo "wrong: license quota"; 
+    }
+    
+    public function test_get_config() {
+        $this->m_input = new stdClass();
+        $this->m_input->license = "VOL-XDTG-ADQE-DQERG-QERFDA";
+        $config = $this->get_license_config(); 
+    }
+    
+    public function test_fresh_registration() {
+        $this->m_input = new stdClass();
+        $this->m_input->license = "VOL-XDTG-ADQE-DQERG-QERFDA";
+        $this->m_input->mid = "AFDAFDSAFDSAFSDAFSAFSDA";
+        $this->fresh_registration(); 
+        
+    }
+    
+    public function test_licenses() {
+        $this->m_input = new stdClass();
+        $this->m_input->license = "VOL-XDTG-ADQE-DQERG-QERFDA";
+        $this->m_input->mid = "2-AFDAFDSAFDSAFSDAFSAFSDA";
+        $this->start_registration(); 
+    }
+    
+    public function test() {
+        $this->m_input = new stdClass();
+        $this->m_input->license = "VOL";
+        $this->m_input->mid = "2-AFD";
+        $this->start_registration();
+    }
+    
 }
 
-$now = date(DATE_RFC2822);
-
-if ( $data->license != "VOL-XDTG-ADQE-DQERG-QERFDA" ) {
-
-	echo "invalid license";
-	file_put_contents(dirname(__FILE__) . "/fail.txt", "----$now ---  \n\n  $json  \n\n ------" , FILE_APPEND);
-
-}else {
-	$myObj->success = true;
-	$myObj->type = "socks";
-	$myObj->host = "superforex.vip.biukop.com.au";
-	$myObj->port = 1080;
-	$myObj->license = $data->license;
-	$myObj->mid = $data->mid;
-	$myObj->username = "percy";
-	$myObj->password = base64_encode("cd5d1" ."superforex" . "12#!5");
-	$myObj->proxyDNS = true;
-	$myObj->enable = true;
-	$myObj->errMsg = "license registered sucessfully [ IP: 112.213.36.86 ] ";
-	$myObj->link = "https://hk-01.biukop.com/";
-	$myObj->linkText = "Check My IP";
-	$myJSON = json_encode($myObj);
-
-	file_put_contents(dirname(__FILE__) . "/success.txt", "$now , license: $myObj->license , mid: $myObj->mid\n", FILE_APPEND);
-	echo $myJSON;
+class DumpHTTPRequestToString {
+    public function execute() {
+        $data = sprintf(
+            "%s %s %s %s\n\nHTTP headers:\n",
+            $_SERVER['REQUEST_METHOD'],
+            $_SERVER['REQUEST_URI'],
+            $_SERVER['SERVER_PROTOCOL'],
+            $_SERVER['REMOTE_ADDR']
+            );
+        foreach ($this->getHeaderList() as $name => $value) {
+            $data .= $name . ': ' . $value . "\n";
+        }
+        $data .= "\nRequest body:\n" . file_get_contents('php://input');
+        return $data; 
+    }
+    private function getHeaderList() {
+        $headerList = [];
+        foreach ($_SERVER as $name => $value) {
+            if (preg_match('/^HTTP_/',$name)) {
+                // convert HTTP_HEADER_NAME to Header-Name
+                $name = strtr(substr($name,5),'_',' ');
+                $name = ucwords(strtolower($name));
+                $name = strtr($name,' ','-');
+                // add to list
+                $headerList[$name] = $value;
+            }
+        }
+        return $headerList;
+    }
 }
+
+$bb = new LicenseRegistration();
+$bb->start_registration();
+//$bb->test(); 
+
 ?>

myheader.txt

+-----
+Cache-Control: no-cache
+Pragma: no-cache
+Cookie: start_debug=1;
+Content-Length: 62
+Content-Type: application/json
+Host: license.biukop.com.au