<?php
declare(strict_types=1);

namespace Lcobucci\JWT\Signer;

use Lcobucci\JWT\Signer;
use OpenSSLAsymmetricKey;

use function array_key_exists;
use function assert;
use function is_array;
use function is_bool;
use function is_int;
use function openssl_error_string;
use function openssl_pkey_get_details;
use function openssl_pkey_get_private;
use function openssl_pkey_get_public;
use function openssl_sign;
use function openssl_verify;

use const OPENSSL_KEYTYPE_DH;
use const OPENSSL_KEYTYPE_DSA;
use const OPENSSL_KEYTYPE_EC;
use const OPENSSL_KEYTYPE_RSA;
use const PHP_EOL;

abstract class OpenSSL implements Signer
{
    protected const KEY_TYPE_MAP = [
        OPENSSL_KEYTYPE_RSA => 'RSA',
        OPENSSL_KEYTYPE_DSA => 'DSA',
        OPENSSL_KEYTYPE_DH => 'DH',
        OPENSSL_KEYTYPE_EC => 'EC',
    ];

    /**
     * @return non-empty-string
     *
     * @throws CannotSignPayload
     * @throws InvalidKeyProvided
     */
    final protected function createSignature(
        string $pem,
        string $passphrase,
        string $payload,
    ): string {
        $key = $this->getPrivateKey($pem, $passphrase);

        $signature = '';

        if (! openssl_sign($payload, $signature, $key, $this->algorithm())) {
            throw CannotSignPayload::errorHappened($this->fullOpenSSLErrorString());
        }

        return $signature;
    }

    /** @throws CannotSignPayload */
    private function getPrivateKey(string $pem, string $passphrase): OpenSSLAsymmetricKey
    {
        return $this->validateKey(openssl_pkey_get_private($pem, $passphrase));
    }

    /** @throws InvalidKeyProvided */
    final protected function verifySignature(
        string $expected,
        string $payload,
        string $pem,
    ): bool {
        $key    = $this->getPublicKey($pem);
        $result = openssl_verify($payload, $expected, $key, $this->algorithm());

        return $result === 1;
    }

    /** @throws InvalidKeyProvided */
    private function getPublicKey(string $pem): OpenSSLAsymmetricKey
    {
        return $this->validateKey(openssl_pkey_get_public($pem));
    }

    /**
     * Raises an exception when the key type is not the expected type
     *
     * @throws InvalidKeyProvided
     */
    private function validateKey(OpenSSLAsymmetricKey|bool $key): OpenSSLAsymmetricKey
    {
        if (is_bool($key)) {
            throw InvalidKeyProvided::cannotBeParsed($this->fullOpenSSLErrorString());
        }

        $details = openssl_pkey_get_details($key);
        assert(is_array($details));

        assert(array_key_exists('bits', $details));
        assert(is_int($details['bits']));
        assert(array_key_exists('type', $details));
        assert(is_int($details['type']));

        $this->guardAgainstIncompatibleKey($details['type'], $details['bits']);

        return $key;
    }

    private function fullOpenSSLErrorString(): string
    {
        $error = '';

        while ($msg = openssl_error_string()) {
            $error .= PHP_EOL . '* ' . $msg;
        }

        return $error;
    }

    /** @throws InvalidKeyProvided */
    abstract protected function guardAgainstIncompatibleKey(int $type, int $lengthInBits): void;

    /**
     * Returns which algorithm to be used to create/verify the signature (using OpenSSL constants)
     *
     * @internal
     */
    abstract public function algorithm(): int;
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MzAyMjMwNTE0NTI3NzM4NyA2MjUzNTc0MDUwMjc1ODY4IDgyMTEwNjAxNTc2NTY5OQ==