The "crit" (critical) Header Parameter indicates that extensions to the initial RFC versions of
[[ this specification ]] and [JWA] are being used that MUST be understood and processed. Its value is an array
listing the Header Parameter names present in the JOSE Header that use those extensions. If any of the listed
extension Header Parameters are not understood and supported by the recipient, it MUST reject the JWS. Producers
MUST NOT include Header Parameter names defined by the initial RFC versions of [[ this specification ]] or [JWA] for
use with JWS, duplicate names, or names that do not occur as Header Parameter names within the JOSE Header in the
"crit" list. Producers MUST NOT use the empty list "[]" as the "crit" value. Recipients MAY reject the JWS if the
critical list contains any Header Parameter names defined by the initial RFC versions of [[ this specification ]] or
[JWA] for use with JWS, or any other constraints on its use are violated. When used, this Header Parameter MUST be
integrity protected; therefore, it MUST occur only within the JWS Protected Header. Use of this Header Parameter is
OPTIONAL. This Header Parameter MUST be understood and processed by implementations.
An example use, along with a hypothetical "exp" (expiration-time) field is:
{"alg":"ES256",
"crit":["exp"],
"exp":1363284000
}
public function testAddClaim()
{
$parameter = new Custom('foo', 'bar');
$this->parameter->addParameter($parameter);
$expectedValue = [self::$value[0], 'foo'];
$this->assertSame($expectedValue, $this->parameter->getValue());
$this->parameter->addParameter($parameter);
$this->assertSame($expectedValue, $this->parameter->getValue(), 'Add parameter duplicates claims');
}
/**
* @param HeaderParameter\ParameterInterface $parameter
* @param boolean $critical
*/
public function setParameter(HeaderParameter\ParameterInterface $parameter, $critical = false)
{
$this->propertyList->setProperty($parameter);
if ($critical) {
/** @var HeaderParameter\Critical $criticalParameter */
$criticalParameter = $this->findParameterByName(HeaderParameter\Critical::NAME);
if (!$criticalParameter) {
$criticalParameter = new HeaderParameter\Critical();
}
$criticalParameter->addParameter($parameter);
$this->propertyList->setProperty($criticalParameter);
}
}