Viewing file:  GoogleTokenGenerator.php (3.73 KB) -rw-r--r--
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<?php
namespace Stichoza\GoogleTranslate\Tokens;
/**
* Google Token Generator.
*
* Thanks to @helen5106, @tehmaestro and few other cool guys
* at https://github.com/Stichoza/google-translate-php/issues/32
*/
class GoogleTokenGenerator implements TokenProviderInterface
{
/**
* Generate and return a token.
*
* @param string $source Source language
* @param string $target Target language
* @param string $text Text to translate
* @return string Token
*/
public function generateToken(string $source, string $target, string $text): string
{
$tkk = ['406398', 2087938574];
for ($d = [], $e = 0, $f = 0; $f < $this->length($text); $f++) {
$g = $this->charCodeAt($text, $f);
if ($g < 128) {
$d[$e++] = $g;
} else {
if ($g < 2048) {
$d[$e++] = $g >> 6 | 192;
} else {
if ($g & 64512 === 55296 && $f + 1 < $this->length($text) && ($this->charCodeAt($text, $f + 1) & 64512) === 56320) {
$g = 65536 + (($g & 1023) << 10) + ($this->charCodeAt($text, ++$f) & 1023);
$d[$e++] = $g >> 18 | 240;
$d[$e++] = $g >> 12 & 63 | 128;
} else {
$d[$e++] = $g >> 12 | 224;
}
$d[$e++] = $g >> 6 & 63 | 128;
}
$d[$e++] = $g & 63 | 128;
}
}
$a = $tkk[0];
foreach ($d as $value) {
$a += $value;
$a = $this->rl($a, '+-a^+6');
}
$a = $this->rl($a, '+-3^+b+-f');
$a ^= $tkk[1];
if ($a < 0) {
$a = ($a & 2147483647) + 2147483648;
}
$a = fmod($a, 1000000);
return $a . '.' . ($a ^ $tkk[0]);
}
/**
* Process token data by applying multiple operations.
* (Parameters are safe, no need for multibyte functions)
*
* @param int $a
* @param string $b
*
* @return int
*/
private function rl(int $a, string $b): int
{
for ($c = 0; $c < strlen($b) - 2; $c += 3) {
$d = $b[$c + 2];
$d = $d >= 'a' ? ord($d[0]) - 87 : (int) $d;
$d = $b[$c + 1] === '+' ? $this->unsignedRightShift($a, $d) : $a << $d;
$a = $b[$c] === '+' ? ($a + $d & 4294967295) : $a ^ $d;
}
return $a;
}
/**
* Unsigned right shift implementation
* https://msdn.microsoft.com/en-us/library/342xfs5s(v=vs.94).aspx
* http://stackoverflow.com/a/43359819/2953830
*
* @param int $a
* @param int $b
*
* @return int
*/
private function unsignedRightShift(int $a, int $b): int
{
if ($b >= 32 || $b < -32) {
$m = (int) ($b / 32);
$b -= ($m * 32);
}
if ($b < 0) {
$b += 32;
}
if ($b === 0) {
return (($a >> 1) & 0x7fffffff) * 2 + (($a >> $b) & 1);
}
if ($a < 0) {
$a >>= 1;
$a &= 2147483647;
$a |= 0x40000000;
$a >>= ($b - 1);
} else {
$a >>= $b;
}
return $a;
}
/**
* Get JS charCodeAt equivalent result with UTF-16 encoding
*
* @param string $string
* @param int $index
*
* @return int
*/
private function charCodeAt(string $string, int $index): int
{
return mb_ord(mb_substr($string, $index, 1));
}
/**
* Get JS equivalent string length with UTF-16 encoding
*
* @param string $string
*
* @return int
*/
private function length(string $string): int
{
return mb_strlen($string);
}
}
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