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<?php
declare(strict_types=1);
namespace SpomkyLabs\Pki\X509\Certificate;
use ArrayIterator;
use function count;
use Countable;
use IteratorAggregate;
use LogicException;
use SpomkyLabs\Pki\ASN1\Type\Constructed\Sequence;
use SpomkyLabs\Pki\ASN1\Type\UnspecifiedType;
use SpomkyLabs\Pki\X509\Certificate\Extension\AuthorityKeyIdentifierExtension;
use SpomkyLabs\Pki\X509\Certificate\Extension\BasicConstraintsExtension;
use SpomkyLabs\Pki\X509\Certificate\Extension\CertificatePoliciesExtension;
use SpomkyLabs\Pki\X509\Certificate\Extension\CRLDistributionPointsExtension;
use SpomkyLabs\Pki\X509\Certificate\Extension\ExtendedKeyUsageExtension;
use SpomkyLabs\Pki\X509\Certificate\Extension\Extension;
use SpomkyLabs\Pki\X509\Certificate\Extension\InhibitAnyPolicyExtension;
use SpomkyLabs\Pki\X509\Certificate\Extension\IssuerAlternativeNameExtension;
use SpomkyLabs\Pki\X509\Certificate\Extension\KeyUsageExtension;
use SpomkyLabs\Pki\X509\Certificate\Extension\NameConstraintsExtension;
use SpomkyLabs\Pki\X509\Certificate\Extension\PolicyConstraintsExtension;
use SpomkyLabs\Pki\X509\Certificate\Extension\PolicyMappingsExtension;
use SpomkyLabs\Pki\X509\Certificate\Extension\SubjectAlternativeNameExtension;
use SpomkyLabs\Pki\X509\Certificate\Extension\SubjectKeyIdentifierExtension;
use Traversable;
/**
* Implements *Extensions* ASN.1 type.
*
* Several convenience methods are provided to fetch commonly used standard extensions. Others can be accessed using
* `get($oid)`.
*
* @see https://tools.ietf.org/html/rfc5280#section-4.1.2.9
*/
final class Extensions implements Countable, IteratorAggregate
{
/**
* Extensions.
*
* @var Extension[]
*/
private array $extensions;
/**
* @param Extension ...$extensions Extension objects
*/
private function __construct(Extension ...$extensions)
{
$this->extensions = [];
foreach ($extensions as $ext) {
$this->extensions[$ext->oid()] = $ext;
}
}
public static function create(Extension ...$extensions): self
{
return new self(...$extensions);
}
/**
* Initialize from ASN.1.
*/
public static function fromASN1(Sequence $seq): self
{
$extensions = array_map(
static fn (UnspecifiedType $el) => Extension::fromASN1($el->asSequence()),
$seq->elements()
);
return self::create(...$extensions);
}
/**
* Generate ASN.1 structure.
*/
public function toASN1(): Sequence
{
$elements = array_values(array_map(static fn ($ext) => $ext->toASN1(), $this->extensions));
return Sequence::create(...$elements);
}
/**
* Get self with extensions added.
*
* @param Extension ...$exts One or more extensions to add
*/
public function withExtensions(Extension ...$exts): self
{
$obj = clone $this;
foreach ($exts as $ext) {
$obj->extensions[$ext->oid()] = $ext;
}
return $obj;
}
/**
* Check whether extension is present.
*
* @param string $oid Extensions OID
*/
public function has(string $oid): bool
{
return isset($this->extensions[$oid]);
}
/**
* Get extension by OID.
*/
public function get(string $oid): Extension
{
if (! $this->has($oid)) {
throw new LogicException("No extension by OID {$oid}.");
}
return $this->extensions[$oid];
}
/**
* Check whether 'Authority Key Identifier' extension is present.
*/
public function hasAuthorityKeyIdentifier(): bool
{
return $this->has(Extension::OID_AUTHORITY_KEY_IDENTIFIER);
}
/**
* Get 'Authority Key Identifier' extension.
*/
public function authorityKeyIdentifier(): AuthorityKeyIdentifierExtension
{
return $this->get(Extension::OID_AUTHORITY_KEY_IDENTIFIER);
}
/**
* Check whether 'Subject Key Identifier' extension is present.
*/
public function hasSubjectKeyIdentifier(): bool
{
return $this->has(Extension::OID_SUBJECT_KEY_IDENTIFIER);
}
/**
* Get 'Subject Key Identifier' extension.
*/
public function subjectKeyIdentifier(): SubjectKeyIdentifierExtension
{
return $this->get(Extension::OID_SUBJECT_KEY_IDENTIFIER);
}
/**
* Check whether 'Key Usage' extension is present.
*/
public function hasKeyUsage(): bool
{
return $this->has(Extension::OID_KEY_USAGE);
}
/**
* Get 'Key Usage' extension.
*/
public function keyUsage(): KeyUsageExtension
{
return $this->get(Extension::OID_KEY_USAGE);
}
/**
* Check whether 'Certificate Policies' extension is present.
*/
public function hasCertificatePolicies(): bool
{
return $this->has(Extension::OID_CERTIFICATE_POLICIES);
}
/**
* Get 'Certificate Policies' extension.
*/
public function certificatePolicies(): CertificatePoliciesExtension
{
return $this->get(Extension::OID_CERTIFICATE_POLICIES);
}
/**
* Check whether 'Policy Mappings' extension is present.
*/
public function hasPolicyMappings(): bool
{
return $this->has(Extension::OID_POLICY_MAPPINGS);
}
/**
* Get 'Policy Mappings' extension.
*/
public function policyMappings(): PolicyMappingsExtension
{
return $this->get(Extension::OID_POLICY_MAPPINGS);
}
/**
* Check whether 'Subject Alternative Name' extension is present.
*/
public function hasSubjectAlternativeName(): bool
{
return $this->has(Extension::OID_SUBJECT_ALT_NAME);
}
/**
* Get 'Subject Alternative Name' extension.
*/
public function subjectAlternativeName(): SubjectAlternativeNameExtension
{
return $this->get(Extension::OID_SUBJECT_ALT_NAME);
}
/**
* Check whether 'Issuer Alternative Name' extension is present.
*/
public function hasIssuerAlternativeName(): bool
{
return $this->has(Extension::OID_ISSUER_ALT_NAME);
}
/**
* Get 'Issuer Alternative Name' extension.
*/
public function issuerAlternativeName(): IssuerAlternativeNameExtension
{
return $this->get(Extension::OID_ISSUER_ALT_NAME);
}
/**
* Check whether 'Basic Constraints' extension is present.
*/
public function hasBasicConstraints(): bool
{
return $this->has(Extension::OID_BASIC_CONSTRAINTS);
}
/**
* Get 'Basic Constraints' extension.
*/
public function basicConstraints(): BasicConstraintsExtension
{
return $this->get(Extension::OID_BASIC_CONSTRAINTS);
}
/**
* Check whether 'Name Constraints' extension is present.
*/
public function hasNameConstraints(): bool
{
return $this->has(Extension::OID_NAME_CONSTRAINTS);
}
/**
* Get 'Name Constraints' extension.
*/
public function nameConstraints(): NameConstraintsExtension
{
return $this->get(Extension::OID_NAME_CONSTRAINTS);
}
/**
* Check whether 'Policy Constraints' extension is present.
*/
public function hasPolicyConstraints(): bool
{
return $this->has(Extension::OID_POLICY_CONSTRAINTS);
}
/**
* Get 'Policy Constraints' extension.
*/
public function policyConstraints(): PolicyConstraintsExtension
{
return $this->get(Extension::OID_POLICY_CONSTRAINTS);
}
/**
* Check whether 'Extended Key Usage' extension is present.
*/
public function hasExtendedKeyUsage(): bool
{
return $this->has(Extension::OID_EXT_KEY_USAGE);
}
/**
* Get 'Extended Key Usage' extension.
*/
public function extendedKeyUsage(): ExtendedKeyUsageExtension
{
return $this->get(Extension::OID_EXT_KEY_USAGE);
}
/**
* Check whether 'CRL Distribution Points' extension is present.
*/
public function hasCRLDistributionPoints(): bool
{
return $this->has(Extension::OID_CRL_DISTRIBUTION_POINTS);
}
/**
* Get 'CRL Distribution Points' extension.
*/
public function crlDistributionPoints(): CRLDistributionPointsExtension
{
return $this->get(Extension::OID_CRL_DISTRIBUTION_POINTS);
}
/**
* Check whether 'Inhibit anyPolicy' extension is present.
*/
public function hasInhibitAnyPolicy(): bool
{
return $this->has(Extension::OID_INHIBIT_ANY_POLICY);
}
/**
* Get 'Inhibit anyPolicy' extension.
*/
public function inhibitAnyPolicy(): InhibitAnyPolicyExtension
{
return $this->get(Extension::OID_INHIBIT_ANY_POLICY);
}
/**
* @see \Countable::count()
*/
public function count(): int
{
return count($this->extensions);
}
/**
* Get iterator for extensions.
*
* @see \IteratorAggregate::getIterator()
*/
public function getIterator(): Traversable
{
return new ArrayIterator($this->extensions);
}
}