CMXX - Update software downloader

api/v2/get/vin.php

@@ -8,7 +8,7 @@ defined($security_key) or exit;
 // translated from JS (kevinboutin on 3/11/18) to PHP
 // https://gist.github.com/kevboutin/3ac029e336fc7cafd20c05adda42ffa5
 //------------------------------------------
-// Transliterate VIN characters for validation
+/* Transliterate VIN characters for validation
 function transliterate($c) {
     $index = strpos('0123456789.ABCDEFGH..JKLMN.P.R..STUVWXYZ', $c);
     return $index % 10;
@@ -27,6 +27,41 @@ function getCheckDigit($vin) {
 function validateVIN($vin) {
     if (strlen($vin) !== 17) return false;
     return getCheckDigit($vin) === $vin[8];
+}*/
+
+function validateVIN($vin) {
+
+    $vin = strtolower($vin);
+    if (!preg_match('/^[^\Wioq]{17}$/', $vin)) { 
+        return false; 
+    }
+    $weights = array(8, 7, 6, 5, 4, 3, 2, 10, 0, 9, 8, 7, 6, 5, 4, 3, 2);
+    $transliterations = array(
+        "a" => 1, "b" => 2, "c" => 3, "d" => 4,
+        "e" => 5, "f" => 6, "g" => 7, "h" => 8,
+        "j" => 1, "k" => 2, "l" => 3, "m" => 4,
+        "n" => 5, "p" => 7, "r" => 9, "s" => 2,
+        "t" => 3, "u" => 4, "v" => 5, "w" => 6,
+        "x" => 7, "y" => 8, "z" => 9
+    );
+    $sum = 0;
+    for($i = 0 ; $i < strlen($vin) ; $i++ ) { // loop through characters of VIN
+        // add transliterations * weight of their positions to get the sum
+        $check_char = substr($vin, $i, 1);
+        if(!is_numeric($check_char)) {
+            $sum += $transliterations[$check_char] * $weights[$i];
+        } else {
+            $sum += $check_char * $weights[$i];
+        }
+    }
+
+    // find checkdigit by taking the mod of the sum
+    $checkdigit = $sum % 11;
+    if($checkdigit == 10) { // checkdigit of 10 is represented by "X"
+        $checkdigit = "x";
+    }
+    $actual_checkdigit = substr($vin, 8, 1);
+    return ($checkdigit == $actual_checkdigit); 
 }
 
 //------------------------------------------
@@ -79,14 +114,15 @@ if (strlen($get_content) == 17){
     
     $messages = [
         "VIN" => $vin,
-        "IsValid" => (validateVIN($vin) ? "Yes" : "No"),
         "Manufacturer" => getManufacturer(getWMI($vin)),
         "year" => getYear(getVIS($vin))
     ];
 }
 else {
     $messages = [
-        "IsValid" => "No"
+        "VIN" => $vin,
+        "Manufacturer" => "Unknown",
+        "year" => "Unknown"
     ];
 }