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<?php |
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namespace Schnittstabil\Csrf\TokenService; |
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use Base64Url\Base64Url; |
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/** |
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* A TokenGenerator. |
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*/ |
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class TokenGenerator |
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{ |
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protected $sign; |
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protected $ttl; |
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protected $base64url; |
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/** |
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* Create a new TokenGenerator. |
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* |
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* `$ttl` is used for calculating the expiration time of the tokens, its default value (1440sec === 24min) |
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* correspond to the default `session.gc_maxlifetime`. |
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* |
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* @see http://php.net/manual/en/session.configuration.php Documentation of `session.gc-maxlifetime` |
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* |
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* @param callable $sign Callable used for generating the token signatures |
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* @param int $ttl Default Time to Live in seconds |
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*/ |
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public function __construct(callable $sign, $ttl = 1440) |
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{ |
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if (!is_int($ttl)) { |
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throw new \InvalidArgumentException('ttl is not an integer'); |
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} |
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if ($ttl <= 0) { |
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throw new \InvalidArgumentException('ttl is non-positive'); |
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} |
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$this->sign = $sign; |
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$this->ttl = $ttl; |
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$this->base64url = new Base64Url(); |
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} |
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/** |
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* Generate the payload of a CSRF token. |
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* |
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* @param string $nonce Value used to associate a client session |
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* @param int $iat The time that the token was issued, defaults to `time()` |
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* @param int $exp The expiration time |
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* |
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* @return \stdClass |
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*/ |
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protected function generatePayload($nonce, $iat, $exp) |
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{ |
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$payload = new \stdClass(); |
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$payload->nonce = $nonce; |
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$payload->iat = $iat; |
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$payload->ttl = $exp - $iat; |
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$payload->exp = $exp; |
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return $payload; |
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} |
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/** |
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* Generate a CSRF token. |
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* |
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* @param string $nonce Value used to associate a client session |
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* @param int $iat The time that the token was issued, defaults to `time()` |
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* @param int $exp The expiration time, defaults to `$iat + $this->ttl` |
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* |
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* @return string |
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* |
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* @throws \InvalidArgumentException For invalid $iat, $exp and $nonce arguments |
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*/ |
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public function __invoke($nonce, $iat = null, $exp = null) |
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{ |
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if ($iat === null) { |
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$iat = time(); |
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} |
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if (!is_int($iat)) { |
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throw new \InvalidArgumentException('iat is not an integer'); |
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} |
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if ($exp === null) { |
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$exp = $iat + $this->ttl; |
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} |
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if (!is_int($exp)) { |
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throw new \InvalidArgumentException('exp is not an integer'); |
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} |
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if ($exp < $iat) { |
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throw new \InvalidArgumentException('exp before iat'); |
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} |
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if (!is_string($nonce)) { |
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throw new \InvalidArgumentException('nonce is not an string'); |
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} |
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$payload = $this->generatePayload($nonce, $iat, $exp); |
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$payloadBase64 = $this->base64url->encode(json_encode($payload)); |
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$sign = $this->sign; |
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return $payloadBase64.'.'.$sign($payloadBase64); |
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} |
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} |
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schnittstabil /
csrf-tokenservice
