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<?php |
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namespace Garbuzivan\Laraveltokens; |
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use Exception; |
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class Coder |
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{ |
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/** |
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* @param array $payload |
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* @param string $key |
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* @param array $head [exp - expiration] |
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* |
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* @return string |
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* @throws Exception |
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*/ |
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public function encode(array $payload, string $key, array $head = []): string |
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{ |
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$header = ['typ' => 'JWT', 'alg' => 'HS256']; |
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$header = \array_merge($head, $header); |
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$segments = []; |
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$segments[] = $this->urlsafeB64Encode($this->jsonEncode($header)); |
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$segments[] = $this->urlsafeB64Encode($this->jsonEncode($payload)); |
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$signing_input = \implode('.', $segments); |
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$signature = $this->sign($signing_input, $key); |
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$segments[] = $this->urlsafeB64Encode($signature); |
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return \implode('.', $segments); |
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} |
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/** |
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* @param string $token |
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* @param string $key |
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* |
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* @return array |
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* @throws Exception |
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*/ |
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public function decode(string $token, string $key): array |
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{ |
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$data = []; |
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$tks = \explode('.', $token); |
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if (\count($tks) != 3) { |
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return $data; |
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} |
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[$headb64, $bodyb64, $cryptob64] = $tks; |
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$header = $this->jsonDecode($this->urlsafeB64Decode($headb64)); |
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$payload = $this->jsonDecode($this->urlsafeB64Decode($bodyb64)); |
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$sig = $this->urlsafeB64Decode($cryptob64); |
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$segments = []; |
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$segments[] = $this->urlsafeB64Encode($this->jsonEncode($header)); |
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$segments[] = $this->urlsafeB64Encode($this->jsonEncode($payload)); |
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$signing_input = \implode('.', $segments); |
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if ($this->sign($signing_input, $key) == $sig) { |
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return \array_merge($header, $payload); |
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} |
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return $data; |
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} |
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/** |
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* Decode a JSON string into a PHP object. |
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* |
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* @param string $input JSON string |
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* |
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* @return array Object representation of JSON string |
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* |
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* @throws Exception Provided string was invalid JSON |
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*/ |
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public function jsonDecode(string $input): array |
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{ |
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$obj = \json_decode($input, true); |
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if (is_null($obj)) { |
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throw new Exception('Null result with non-null input'); |
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} |
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return $obj; |
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} |
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/** |
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* Encode a PHP object into a JSON string. |
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* |
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* @param array $input A PHP object or array |
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* |
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* @return string JSON representation of the PHP object or array |
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* |
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* @throws Exception Provided object could not be encoded to valid JSON |
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*/ |
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public function jsonEncode(array $input): string |
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{ |
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$json = \json_encode($input); |
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if ($errno = \json_last_error()) { |
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$this->handleJsonError($errno); |
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} |
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return $json; |
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} |
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/** |
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* Helper method to create a JSON error. |
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* |
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* @param int $errno An error number from json_last_error() |
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* |
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* @return void |
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* @throws Exception |
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*/ |
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private function handleJsonError(int $errno) |
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{ |
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$messages = [ |
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JSON_ERROR_DEPTH => 'Maximum stack depth exceeded', |
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JSON_ERROR_STATE_MISMATCH => 'Invalid or malformed JSON', |
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JSON_ERROR_CTRL_CHAR => 'Unexpected control character found', |
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JSON_ERROR_SYNTAX => 'Syntax error, malformed JSON', |
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JSON_ERROR_UTF8 => 'Malformed UTF-8 characters' //PHP >= 5.3.3 |
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]; |
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throw new Exception($messages[$errno] ?? 'Unknown JSON error: ' . $errno); |
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} |
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/** |
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* @param string $msg |
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* @param string $key |
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* |
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* @return false|string |
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*/ |
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public function sign(string $msg, string $key) |
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{ |
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return \hash_hmac('SHA256', $msg, $key, true); |
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} |
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/** |
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* Decode a string with URL-safe Base64. |
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* |
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* @param string $input A Base64 encoded string |
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* |
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* @return string A decoded string |
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*/ |
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public function urlsafeB64Decode($input) |
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{ |
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$remainder = \strlen($input) % 4; |
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if ($remainder) { |
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$padlen = 4 - $remainder; |
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$input .= \str_repeat('=', $padlen); |
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} |
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return \base64_decode(\strtr($input, '-_', '+/')); |
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} |
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/** |
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* Encode a string with URL-safe Base64. |
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* |
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* @param string $input The string you want encoded |
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* |
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* @return string The base64 encode of what you passed in |
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*/ |
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public function urlsafeB64Encode($input) |
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{ |
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return \str_replace('=', '', \strtr(\base64_encode($input), '+/', '-_')); |
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} |
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} |
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garbuzivan /
laraveltokens
